0 npsi-felisa solar fs write-up

8/17/2019 0 NPSI-Felisa Solar FS Write-up

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Interconnection Facilities Study

For Felisa 50 MW Solar Power Plant Negros PH Solar Inc.

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Executive Summary

This Facilities Study is conducted for the 50 MW Negros PH Solar Inc.’s Solar Power Project in

Brgy. Felisa, Mansilingan, Bacolod City, Negros Occidental. This study aims to identify the

necessary connection equipment to connect the proposed power plant to the grid. The connection

configuration presented in this study is based on the connection requirement of NGCP as

documented in the System Impact Study for the project.

The connection arrangement is compliant with the requirements of the Philippine Grid Code and

other applicable regulatory issuances. The proposed project will connect to the grid through a 69

kV transmission facility approximately 1 km in length. The connection will be a ”tapped”

connection along the existing 69 kV transmission line owned by NGCP. Power generated from

the proposed power plant will be delivered to CENECO, NOCECO and to the grid through NGCP’s

Bacolod Substation.

After a series of discussion, it was agreed with the local NGCP that no switching substation will

be installed at the tapping point. Aerial disconnect switch will be installed next to the tapping point

and another one on the tapping pole isolating the CENECO/NONECO line.

In compliance with the requirement of ERC Resolution 16 series of 2011, the power plant’s

disconnection means will be the existing feeder breaker and corresponding disconnect switchesat Bacolod Substation. Included in this study are the telecommunication and protection equipment

needed in by the power plant. From the results of the System Impact Study, no other

improvements or additions will be required for the transmission network beyond the connection

point.

The following are the results of the FS:

1. No issue on the proposed connection scheme as this is to be owned by the developer

following provisions of the Section 9 of the Electric Power Industry Reform Act of 2001;

2. Negros PH will follow NGCP’s Open Access Policy requirements and procedures;


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3. Negros PH will consider the protection arrangement as required by NGCP, as the Grid

Owner;

4. Telecommunication and SCADA equipment will be advanced following the prescription of

the Energy Regulatory Commission under NGCP’s Draft Determination;

5. Protection equipment shall be provided, owned, operated and maintained by NGCP and

NPHSI at their respective sides; and

6. Technical specifications for equipment that are related to the interconnection facility and

interfacing of plant to NGCP’s system as SO shall be in accordance with applicable ERC

issuances (e.g. Philippine Grid Code) as well as NGCP’s standards. Proponent is even

willing to procure the accredited equipment manufacturers in ensure compliances.

It is considered that the assistance of NGCP, which plays critical roles as Transmission Provider,

System Operator and Metering Provider, is crucial to ensure the timely completion and successful

commissioning of the project.


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1.0 Introduction

1.1 Project Background

Negros PH Solar Inc is developing a solar project in Negros island in a land totalling

to 150 hectares. Many of the landowners are prominent local business people with

good reputation. NPHSI aims to secure approximately 280 hectares to build a 200

MW solar in the future.

The interconnection is via the Bacolod – San Enrique 69 KV line which remains a

subtransmission asset. Following previous case precedents, the line has to be filed

for reclassification with the Energy Regulatory Commission.

Initially, this FS is only focused on 50 MW on Site 1 at Felisa given the tight

schedule set by the Department of Energy on the Feed-in Tariff:


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1.2 Scope/Purposes

This Facilities Study applies the findings in the SIS in identifying the necessary equipment

for the connection of the proposed project to the transmission system.

Specifically the study presents the following:

- Substation equipment specification

- Transmission Line requirements

- Identify the appropriate telecommunication and protection facility

The proposed layout of the solar farm is shown below. Note that the layout is for the full

development. This study will not give emphasis on plant’s specification.

Initial development based on the System Impact Study (re-run) will be redesigned such

that it will optimize the utilization of the area with aimed to put it closer to the tapping point

for immediate completion.

It must be emphasized however that the FS does not cover the plant’s configuration and

specifications including its high-voltage equipment such as inverter transformer and step-

up transformers including the switching equipment at the plant switchyard. The FS covers

starting the coordination of protection of the plant’s connection line to NGCP’s system


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including the SCADA and Telecom equipment which are all Grid assets pursuant to Article

4.3 of the Philippine Grid Code.

1.3 Description of Connection Facility

The scope of this facility study includes only the interconnection equipment needed to

connect the proposed generation plant to the grid. Included thus in this report are the

facilities and equipment from the generating plant “take‐of f” substation up to the tapping

point.

The receiving substation will be NGCP’s Bacolod Substation. The feeder circuit breaker

and its associated disconnect switches will serve as the disconnecting means for the

project in compliance with the requirements of ERC Resolution 16 Series of 2011. The

control of these equipment is at NGCP’s Bacolod Substation.

The connecting 69kV transmission line is designed to utilize steel/concrete poles which

are selected for this application to minimize the overall cost of the line in addition to the


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benefits of ease of transportation and installation. The 69kV transmission line will connect

at the existing Bacolod – San Enrique 69kV line as illustrated below. The location of the

solar take-off substation to the existing line is about


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safely and reliably integrated to the Visayas grid, Phase 2 can only be implemented

by the Negros-Panay 230 KV Project.

In agreement with NGCP, the technical assessment has to be conducted and it will

be discussed further in succeeding section.

In order to aid in determining the appropriateness of the equipment related to the

interconnection to NGCP’s system, relevant information have to be considered in

the FS.

i. Demand

ii. Capacity Additions Considered


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iii. Short Circuit Level at Bacolod

VISAYAS GRID FORECAST FAULT LEVELGenerator Impedance Used ‐ Subtransient (Xd")

(As of June 30, 2015)

BUS STATION KV

MAXIMUM FAULT

CURRENT, AmpTHEVENIN IMPEDANCE, Ohm

PHASE GROUND Z1_R Z1_X Z2_R Z2_X Z0_R Z0_X

37500 BACOLOD SS 138 4,034 4,464 3.47768 21.54910 3.70430 21.97810 2.42858 16.16490

35500 BACOLOD_69KV 69 6,578 9,007 0.98017 7.88087 1.03798 7.99257 0.29642 3.00741

Note: Z1- Positive Sequence, Z2 - Negative Sequence, Z0 - Zero Sequence

VISAYAS GRID FORECAST FAULT LEVELGenerator Impedance Used ‐ Subtransient (Xd")(Projected 2016)

BUS STATION KV

MAXIMUM FAULT

CURRENT, AmpTHEVENIN IMPEDANCE, Ohm

PHASE GROUND Z1_R Z1_X Z2_R Z2_X Z0_R Z0_X

37500 BACOLOD SS 138 5,202 5,701 2.33511 14.7341 2.57988 14.4069 1.62274 11.8726

35500 BACOLOD_69KV 69 9,408 12,512 0.62706 4.80683 0.68234 4.75931 0.20064 2.03129

Note: Z1- Positive Sequence, Z2 - Negative Sequence, Z0 - Zero Sequence

iv. Transmission Expansion Considered


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v. Technical Assessment

Results of the SIS shall be discussed in the attachment to be provided in the final

appendix.

2.0 Objective

Following the requirements prescribed under Module B15 of the Open Access

Transmission Service (OATS) Rules, the purpose of the facility study is to determine

the details of the connection scheme and specifications of the equipment to be used

to conform with the requirement of NGCP and in accordance with the provisions of

the Philippine Grid Code as amended in 2007, The Renewable Energy Act otherwise

known as RA 9513 and RA 9136 (EPIRA).

The primary objective of the Interconnection Facilities Study is to determine the

interconnection scheme to the transmission system. It intends to identify the major


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equipment related to interconnection and the necessary secondary devices which are

crucial infrastructures related to the role of NGCP as System Operation.

3.0 Connection Configuration

Anticipating the approval of the new PGC, it is considered safe that in the selection of

connection scheme it will be better to adopt the definition in amendment no. 2, which

states as quoted below:

“GCR 4.4.1 Requirements Relating to the ConnectionPoint

GCR 4.4.1.1 The Generator ’s Equipment shall be connected to the Grid or to

the Distribution System at the voltage level(s) agreed to by the Grid Operator

or the Distributor and the Generator based on Grid Impact Studies.

GCR 4.4.1.2 The Connection Point shall be controlled by a circuit breaker that

is capable of interrupting the maximum short circuit current at the point of

connection.

GCR 4.4.1.3 Disconnect switches shall also be provided and arranged to

isolate the circuit breaker for maintenance purposes.”

In the layout below, it already considered that mandatory requirements set by the PGC.


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Figure 2: Basic layout of the substation

While the corresponding plan is:

Figure 3: Basic plan of the substation

4.0 Asset Boundary

In accordance with the Resolution 16 Series of 2011issued by the Energy Regulatory

Commission (ERC) dated 6 July 2011 Section 4.2 Connection Assets for Generation

Customers of Transmission Provider, 3rd paragraph, A generation company

may develop and own or operate a dedicated point-to-point limited facilities

provided,that such facilities are required only for the purpose of connecting to

the transmission system, and are used solely by the generating facility subject to priorauthorization by the ERC and following the convention in Annex C of said

resolution, the asset boundary between NPHSI and NGCP shall be at the at the tapping

point at San Enrique 69 KV line as illustrated below:

Following requirements at the tapping point, below are the illustration of the tapping point

but will be subject to the approval of NGCP prior to the construction stage.


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Figure 4: Illustration of asset boundary


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Figure 5: Details of the tap-connection

NPHSI shall execute the Fixed Asset Boundary Document as one of the attachments

of the Transmission Service Agreement.

The document will precisely show the Connection Point and shall specify the following:

a. Equipment and ownership

b. Accountable Managers

c. Safety Rules and procedures during Local Safety Instruction and the Safety

Coordination of any other persons for safety

d. Operational procedures and the responsible party for operation and control

e. Maintenance agreement and the responsible party for undertaking the

maintenance

f. Any agreement pertaining to emergency situation

5.0 Receiving Substation Facility Requirements

The existing Bacolod Substation 69kV switchyard will be maintained as is. The

“tapped” connection will not require modifications at the switchyard. Only

communication facility via optical groundwire will be installed at this substation.


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5.1.1 General Technical Requirements

The electrical equipment shall be designed in such a way as to bear without

damage and permanent deformation the consequences of over voltage of internal

or atmospheric origin and each electrical component can withstand the maximum

stresses under fault conditions.

Outdoor installations shall be protected against solar radiation by means of

adequate covers, where required, with non-deteriorating material.

All equipment shall be designed to be insensitive to any signals emitted by wireless

communication equipment.

All metallic frames shall be securely connected to the general earthing system in

compliance with accepted standards.

The center line spacing and clearances above ground level of the conductors

shall be as shown in the detailed design drawings.

The minimum clearance between live metal parts and ground shall be 837.5 mm.

while, the minimum clearance between live metal parts of two phases shall be 1500

mm. The practical distance between phase center lines shall be 1500 mm. and the

minimum height of live conductors above ground shall be 3000 mm, however, the

upper edge of an earthed insulator support shall have a height of, at least, 2300 mm.

above the ground level.

Creepage distance of equipment bushing, insulator strings, station post insulators

and rigid support insulators shall be equal or greater than the resultant of the 21mm/KV multiplied by the maximum nominal voltage. Outdoor equipment shall

be painted with RAL 7035 color, while indoor equipment (including inside cubicle)

shall be painted with RAL 7032 color.

Phase indication plates with color and code letters, which shall be luminous

and made of weather resistant materials, shall be provided on the substation steel

structures to indicate the phases of bus, incoming lines and transformer feeders

and shall be as follows: Phase A is Red and code is “A”; Phase B is Yellow and

code is “B”; and Phase C is Blue and code is “C”.


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Outdoor and indoor equipment and panels shall be labeled in accordance with the

Site and Equipment Identification and Labeling (SElL) standard of NGCP as

mandated by the Grid Code. NGCP, therefore, must provide guidance to

the developer on the appropriate nomenclature of the major devices

interphasing with NGCP’s System Operation.

5.1.2 Codes and Standards

All engineering, fabrication, construction/erection, startup and testing provided

by the Contractor shall be in accordance with applicable codes and standards,

regulations and guides. The applicable codes, standards and regulations will

consist of the substation requirements as the basis, and also include those for the

Contractor's nation as follows:

1) Philippine Standards and Codes

2) United States Standards and Codes (IEEE/ANSI/NEMA/NFPA etc.)

3) International Electro-technical Commission (IEC)

4) DIN (German)

5) BS (British standard)

6) JIS (Japanese Industrial Standard)

7) CNS (China National Standard)

5.2 Power Transformer

The Power Transformer i s rated 50/65 MVA (ONAN/ONAF), 13.2/69 kV,

60Hz, and capable of changing its tap ratio by+/- ten percent (10%), with

a step size of 1.25%. The HV bushings of the Power Transformer shall be

of the resin paper impregnated and non-draw lead type. Aside from the

insulation, polarization index, oil dielectric, polarity and ratio tests that are

required by NGCP to be conducted on the power transformer prior to

connection, other routine tests specified under the applicable ANSI/IEEE

standard and the manufacturer's standard test regime shall also be

conducted on the power transformer .

The cooling medium shall be oil and its temperature of cooling air shall not


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exceed 40ºC. Cooler shall be transformer mounted and should be radiator fin

type. Monitoring and control system shall be interfaced at the Substation

Control System.

Transformer shall be equipped with On-load Tap Changer (OLTC) and should

be oil-immersed. Taps shall be ±0.625% by 8 taps. The motor of the OLTC

shall be sourced by 400 VAC, 3-phase at 60 Hz.

5.3 Power Circuit Breaker

The power circuit breakers (PCB) shall be of the SF6 and outdoor type. It

shall be rated at least 69 kV, 60 Hz, with continuous current rating at 60

Hz of at least 2000A rms, with interrupting time of no longer than 50 ms.

and shall be capable of interrupting successfully its rated interrupting current

of at least 4 0 kA rms, for its entire operational life. It shall be capable of

withstanding all system lightning impulse and switching over voltages

less than or equal to its Basic Impulse Level (BIL) or switching surge

withstand capability. Generally, the PCB shall meet or exceed all rated

values listed in applicable ANSI or IEC standards. The PCB shall bedesigned to have the capability of permitting, at least, two complete

closing-opening operations and to withstand swells caused by ground faults.

Each PCB shall be equipped with an operation counter.

Multiple-pole or single-pole tripping devices shall be protected against

accidental operation and conveniently located for manual tripping or local

operation of the PCB. The tripping mechanism shall have two (2) electrically

independent trip coils (circuits) per pole.

PCBs capable of single-pole actuation shall be provided with a phase

discrepancy monitoring and control system for synchronized closing and

opening operation of individual poles.

The PCB shall be capable of switching out line faults (regardless of the

distance between the circuit breakers and faults), no-load lines,

transformers on no-load and reactive loads without causing re-striking when


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switching.

The PCB shall be equipped with enough auxiliary contacts to

accommodate the required status and alarm indications, plus additional

convertible eight (8) types A and B contacts each. The operating status

and other parameters of the PCB shall be monitored/interfaced with the

Substation Automation System (SACS).

The technical data sheets of the PCB are shown in subsequent Annex.

5.4 Disconnect and Earthing Swtich

Disconnect Switches (DS) shall be provided and arranged so as to isolate

the PCB during maitneannce. The switching device shall be station class,

outdoor, 3phase, two column horizontal center break type and rated 60 Hz,

69 kV, 2000 A rms and have a short-time withstand capability of at least

44 kA rms.

The switching device shall be three pole construction, horizontal mode of

contact separation with reference to the mounting plane, and equipped with

an earthing switch.

The switching device shall withstand and operate without malfunction with

simultaneously acting forces from connection at terminals and short circuit.

The safety factor against break of an insulator shall be at least 1.25 times

the simultaneously acting forces plus operating forces.

The DS shall have the capability of being either motor-operated or manual

through remote, local or manual mode.

The DS shall be equipped with enough auxiliary contacts to accommodate

the required status and alarm indications, plus additional convertible eight

(8) types A and B contacts each.

The operating status of the DS shall be monitored/interfaced with the

SACS, whenever applicable. It shall be equipped with key interlocks,


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position indicator (both mechanical and light) and damping device.

The switching device shall be electrically interlocked with the associated

circuit breaker to prevent the possibility of making or breaking load current.

To prevent maloperation, the operating mechanism of disconnect

switches and earthing switches shall be interlocked relative to each other

such that when the main disconnect switch is in "closed" position, the

earthing switch cannot be closed and vice versa. Said interlocking

arrangements shall be effective both in local and in remote operation.

The technical data sheets of the Disconnect/Earthing Switch can be seen

in the Annexes.

5.5 Current Transformer (for statistical meter and protection purposes)

Current Transformers (CT) shall be provided for all PCBs. The CTs shall

be single pole. For outdoor installations, the CT's insulation medium shall

be oil. While, for indoor installations, the CT's insulation medium shall be

SF6 gas.

Current Transformers shall be rated at 69 kV, 60Hz. Its current ratio (with

secondary taps) shall be 2 0 00/1500/1000/500:5A. The CTs shall have 4

cores (i.e., 1 core for metering with accuracy class of 0.2 and 3 cores

for relaying with 5P20 accuracy class) per IEC standards. Rated burden

is 30 VA for metering and 100 VA for protection.

The short-time current thermal rating of the CTs shall be at least 4 0 kA

rms while the rated short-time mechanical is 100 KA rms. The cores shall be

designed and built in such a way that no reciprocal electromagnetic

influence or influence from external fields can occur .

The CT shall have adequate output to meet double the total burden

of the equipment connected to it. It shall also have sufficient thermal,

voltage, over-current performance, internal resistance and accuracy for

the satisfactory operation of the equipment connected to its secondary


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circuit. CT shall withstand the mechanical and thermal stresses caused by

short circuits.

CTs provided for protective purposes shall have over current and saturation

factors not less than those corresponding to the design short circuit level of

the system.

The technical data sheets of the CT (not for billing purposes) are shown in the

Annexes.

5.6 Potential Device

PT shall be of the inductive type, with a marked ratio of 600/345:1 and its

rated secondary voltage shall be 115 VL _J66 .4 VL-G· It shall be of the

accuracy IEC Class 0.3. The burden rating shall be at least 12.5 VA which

can handle the total burden of the cables and all connected devices at the

PT/VT secondary circuit. It shall have three (3) secondary cores/windings,

both, preferably of metering class accuracy. It shall be tested and certified on

ratio accuracy, phase deviation and insulation integrity.

For its rated insulation, the lightning impulse withstand voltage is 350 KV peak

while power frequency withstand voltage is 140 KV rms dry.

The technical data sheets of the Voltage Transformer can be seen in Annex

M, while the test reports of the VTs are shown in the Annexes.

5.7 Surge Arrester

Each arrester shall be station class, outdoor type, metal oxide (i.e., ZnO)

and gapless type with surge counter. Material of insulator can be composite

type.

The surge arrester at the high voltage (69 kV) side shall be rated for

nominal system voltage of 69 kV, while that of the low voltage side shall

be 13.2 kV. The arrester shall be rated 60 Hz, and its Duty Cycle Voltage

rating shall be 60 kV rms, nominal discharge current of 10 kA and the


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Lightning Impulse Withstand Voltage capability of its post insulator

housing, for outdoor installations, shall be 325 kV.

The arrester assembly shall consist of an arrester unit, line terminal,

earth terminal, insulating base, cyclometer type discharge counter with

integral continuous AC leakage/internal current indicator. Outdoor

installations shall have a supporting structure.

Remote indication of discharge counter registers shall be provided and

interfaced with the SACS, if applicable.

The arrester housing shall have either a hollow insulator with gas filling

(tube design) or directly molded housing material on the MO-blocks caged

by FRP rods ("caged design"). Insulator material shall be either porcelain or

silicon rubber.

The unit shall be hermetically sealed, moisture free. For hollow insulators

(tube design), a pressure relief device is required to limit the internal

pressure so as to prevent explosion or violent shattering of the housing

during short circuit current conditions. For outdoor installations, the arresters

shall be vertically mounted on a horizontal surface.

For outdoor installations, each arrester shall be furnished complete with a

non-corroding clamp type ground connector suitable for copper stranded

conductor. The arrester supporting structure shall be provided with a

grounding pad. Each grounding pad shall be flat and shall be provided with

a non-corroding clamp type connector suitable for, at least, 100 sq.mm. sizedannealed, stranded PVC insulated copper ground conductor. The grounding

pad shall be located about 400 mm above finished ground level.

5.8 Substation Automation Control System

The Substation may be equipped with a microprocessor-based Substation

Automation Control System (SACS) to perform control and monitoring

tasks for all the major and critical equipment in the substation. The SACS

consists of the operator workstations, data highway, process controllers,


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engineering workstation, servers, gateways, GPS Time, and all necessary

peripherals. The SACS shall be equipped with at least three (3) data

communication ports to satisfy NGCP Supervisory Control and Data

Acquisition (SCADA) requirements. In the event that the substation is not

equipped with a SACS or the number of data communication ports of the

SACS be insufficient to satisfy the SCADA requirement, a Remote Terminal

Unit (RTU), with, at least, three (3) data communication ports shall be

provided by NGCP and shall be connected to the DNP 3.0-configured data

communication port of the SACS, if applicable. Said three (3) data

communication ports shall use the DNP 3.0 data communication

protocol to communicate with the Back-up NationaV Regional Control Center

(BNIRCC) in Cebu; the Back-up Regional Control Center (BRCC) in Mandaue,

also in Cebu; and, the Area Control Center (ACC) in Iloilo.

The SACSIRTU shall be equipped with sufficient digital and analog inputs

and control outputs to monitor and control all necessary parameters of the

various plant and substation equipment, with enough spare input, output and

control modules.

The SACSIRTU shall display, aside from the important substation diagrams

and parameters, the single-line diagram of the major substation equipment,

including the out-going lines, together with their identification names

conforming to NGCP's Site and Equipment Identification and Labeling (SElL)

Standard.

The SACS/RTU shall monitor and communicate the following substation

equipment parameters to the above said NGCP Control Centers:

1) Each Power

Transformer

• MW

• MVAR

• MVA

• Current, A (each phase)

• Voltage, kV (each phase)


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• Pressure Relief Alarm

• Transformer Differential Relay Alarm

• Buchholz Relay Alarm

• Overcurrent Relay Alarm

• High Winding Temperature Alarm

• Lock-out Alarm

2) Each High Voltage Bus

Voltage

Frequency

Bus differential relay alaRm

3) Power Circuit beaker Status (open, close)

Spring charge alarm

BFR alarm

Auto-reclaose Operation

Open/Close Control Operation

6.0 Transmission Line

6.1 Steel Structure

The structures are made from concrete and designed for 69 kV. The structures are

designed for outdoor, tropical, salt and dust laden and heavily contaminated

atmospheric conditions.

The structures are designed to consider the weight of porcelain insulator strings and

the length of composite insulator strings so that in any maintenance work requiring

replacement of insulator string assembly, both types of insulator assembly can

be used without any restrictions

6.2 Conductor

The conductors to be used at the high voltage (69 kV) shall be 336.4 MCM

ACSR (Linnet), while the line hardware to be used shall be appropriate for said size

of cable.


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The conductor and wire data are as follows:

Particular Data

Size and type ACSR/AS 336.4 MCMC “Linnet” Stranding 26/7Outside diameter 18.26mm Area 198.21 sq.mm.Weight 0.6553 kg/mBreaking strength 6,110 kgs.

6.3 Optical Pilot Ground Wire

The Optical Pilot Ground Wire (OPGW) shall be 1550 nm, single-mode, 36-core fiber based on ITU-T G.652D.

6.4 Conductor Clearances

The Philippine Electrical Code Part II sets safety clearances from ground,

structure and vegetation. Values below are the minimum vertical clearances:

Crossing over at 50ºC no wind final sag Clearance in meterTrack rails of railroad 11.5Public streets and highways 10Rural roads 8.5

Cultivated fields, area accessible only topedestrian along roads in rural areas

7.5

All other types of obstruction Refer to PEC Part II

6.5 Pole Design Criteria

Footing resistance is ≤10 ohms

Design wind velocity is 270 kph

Wind pressure on poles will be in accordance with NESC Rule 252B2

Wind pressure on wires will be in accordance with NESC Rule 250C

6.6 Pole Setting

Pole will be direct buried and below will be followed:

Pole height (in feet) Depth of setting (in feet)On rock On Earth

50 4.5 6.555 5.0 7.0

60 5.5 7.565 6.0 8.0


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70 6.5 8.5

6.7 Insulator

Porcelain or polymer insulator can be used: suspension or post type. For

porcelain appropriate mechanical and electrical rating shall be used. For the

polymer insulator, appropriate specified mechanical load and routine tests load

rating shall be used.

Electrical Parameters:

Nominal system voltage – 69 KV rms

Maximum system line-to-ground voltage – 41.8 KV rms Maximum peak line-to-ground voltage – 59.1 KV rms

Leakage Distance Requirements

Assumed ESDD – 0.01 – 0.04 mg/sq.mm.

Pollution severity – medium (moderately polluted area to be

considered)

Leakage distance – 20mm/KV

Impulse Overvoltage Requirements

Assumed peak impulse current – 40 KA

Pole footing resistance - ≤10 ohm

Impulse withstand – 400 KV

6.8 Line Hardwares

All line hardwares to be used shall be compatible with all the associated lien

materials to be supplied.

6.9 Pole Resistance

Resistance measurement will be conducted to ensure that all poles to be built

are properly grounded. Pole footing earth resistance shall not exceed 10 ohms


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otherwise ground rods or counterpoise shall be installed to meet the required

earth resistance.

7.0 Take-off Substation

The proposed power plant “take‐off” substation will located within NPSI-Felisa Solar

Power facilities The following switchyard equipment not including generator ‐related

facilities, will be installed at the substation:

a. One (1) set of power transformer, 50/65MVA, 13.8/69kV

b. One (1) set power circuit breakers, 69 kV, 40 kA

c. Two (2) sets disconnect switches, 69 kV, 2000A

d. One (1) set current transformer, 69 kV, 2000:5A

e. One (1) set voltage transformer, 69 kV, 350/600:1

f. Two (2) sets surge arrester, 60 kV

The tapping connection shall be installed with Disconnect Switch and Line Fault

Indicator as shown in earlier drawings (Figure No. 5).

Excluding generator ‐related equipment, the following auxiliary power system facilities

will be installed at the control building:

a. 400/230 Vdc Distribution Board

b. 125 Vdc Battery, Charger, and Distribution System

c. 48 Vdc Battery, Charger, and Distribution System

d. 240 Vac UPS System

Switchyard conductors to be used shall be 850 mm2 THAL. OHGW shall be 7/8

Aluminum Clad.

Below is the indicative layout of the substation


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Figure 6: Illustrations of Plan and Layout

Naming conventions of all equipment will follow the GMC’s mandated use of Standard

Equipment Identification and Labelling (SEIL). The proponent shall follow the

prescribed naming to be suggested by NGCP.

8.0 Protection, Control and Monitoring Requirement

Protection relay, control and monitoring equipment should be provided for the “take ‐

off” substation and the new transmission line. These protection schemes were

designed consistent with the requirements of NGCP’s Network Protection Philosophy.

For the “take‐off” substation, the following protection, control, monitoring and

communication equipment should be provided:

a. Protection Main1 and Main 2

b. Transformer Protection Main 1

c. Network Disturbance Monitoring Equipment

d. Control Switchboard

e. Fiber Optic Terminal Equipment


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Protection equipment at Bacolod Substation will be as‐is.

Communication between the receiving and the “take‐off” substations to provide for

exchange of remote control signal, alarm status, metering data, relay communications

requirements, and voice link shall be implemented through OPGW.

Metering CT and PT will be provided by the Project Proponent while revenue meters

may be supplied by NGCP as metering service provider and will be installed at the

“take‐off” substation.

Technical Data sheet are provided in the Annexes.

9.0 Communication and SCADA Requirements

Section 4.6.1 Communication System for Monitoring and Control of Chapter 4 Grid

Connection Requirements, a communication system shall be established so that Grid

Owner, the System Operator and the Users can communicate with one another as

well as exchange data signals for monitoring and controlling the Grid during normal

and emergency condition. On the other hand, Section 4.6.2 SCADA System for

Monitoring and Control, the Grid Owner shall provide a Remote Terminal Unit (RTU)

for interconnection of the System Operator's Control Center to serve as telemetry

equipment for monitoring real time information and controlling the Equipment at

the User System.

The Communication and SCADA shall be provided to communicate the proposed

50 MW solar project is described in the succeeding article.

Technical Data sheet are provided in the Annexes.

10.0 Revenue Metering

NPHSI has not decided on what metering agreement it will enter with NGCP.

Nevertheless, NPHSI will be guided with the following NGCP standards for the

Revenue Metering as described in succeeding paragraph.

In accordance with Section 8.2.1 Metering Equipment of Chapter 8 of PGC, the


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Metering E quipment at the Connection point shall consist of :

a. Instrument Transformers;

b. Lightning Protections;

c. Revenue Class Meters;

d. Integrating pulse recorder(s) and time source;

e. All interconnecting wires and associated devices;

f. Data communication devices; and

g. Mounting structures and ground wires for instrument transformers

The technical requirements and the e quipment specifications shall be in

accordance with NGCP's Standard Specifications as described below:

“ A. MINIMUM TECHNICAL REQUIREMENTS FOR THE GRID METERING

FACILITIES:

1. Blondel's Theorem Compliance. The metering circuit for a 3-phase

4- wire Y connection of the Customer circuit, shall be 3-Eiement.

For a 3- Phase 3-Wire Delta connection, the metering circuit shall be

Delta connected 2 Element.

For the 3-Eiement, 4-Wire Y metering circuit, the Neutral Point of the

Potential and Current Transformer Secondaries are to be grounded

at a single point to the system ground mat through the grounding

connection at the meter enclosure.

2. Exclusive Use of Instrument Transformers for Revenue Metering.

To safeguard the security of the metering facility, and to prevent the

simultaneous loss of metering and other functions in case of

instrument transformer failure, the Potential and Current Transformers

shall be exclusively used for revenue metering. The use of the

instrument transformers for both revenue metering applications

and substation protection is not allowed, even with separate

cores/windings.


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3. Voltage or Potential Transformers (VT or PT)

a. Type: Inductive type

b. Secondary Voltage: 115VAC for 34KV and above, 120VAC

for lower voltages

c. Accuracy Class: ANSI Class 0.3/IEC Class 0.2 or better

d. Burden Rating: Must be at least 100% higher than the total

burden of the cables and all connected devices at the PT

secondary circuit.

e. Secondary Cores/Windings: Preferably 2, both of which are

metering class

f. Factory Test Report(s): Test Reports of Ratio Accuracy,

Phase Deviation, and Insulation Integrity

4. Current Transformers (CT)

a. Type: Inductive-type

b. Secondary Current: 0-5A

c Primary Current Range: 1.25 - 1.5 x the expected Full Load

Current. For a CT with multiple ratios, the change of tapping

shall be at the secondary side.

d. Accuracy Class: For Loads: ANSI Class 0.3/IEC Class 0.2 or

Better

For Generators: ANSI Class 0.15/IEC Class 0.2s or Better

e. Burden Rating: Must be at least 100% higher than the total

burden of the cables and all connected devices at the CT


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secondary circuit.

f. Secondary Cores/Windings: Preferably 2, both of which are

metering class

g. Factory Test Report(s): Test Reports of Ratio Accuracy,

Phase Deviation, and Insulation Integrity. For multiple-ratio

CT's, they shall be factory-tested for accuracy and phase

deviation at all current ratios.

5. Lightning/Surge Arresters. Lightning/surge arresters ofappropriate electrical ratings for the application shall be installed at

the line side of the instrument transformers.

6. Metal Meter Security Enclosure. A steel or aluminum security

enclosure for the main and alternate meter which can be secured by

padlocks and security seals shall be provided. The enclosure shall be

provided with a glass viewing window for visual observation/reading

of meter registers.

7. Instrument Transformer Secondary Cables. The cables shall be

stranded and with a minimum size of No.12 AWG, and whose

resistance shall not cause the burden of the metering circuit to

exceed 50% of the rated burden of the instrument transformers at

a maximum length of 15 meters from the instrument transformer

secondary terminal to the metal enclosure.

All Instrument Transformer Secondariesare to be cabled through

the Meter Enclosure, including unused instrument transformer

secondaries.

8. Rigid Steel Conduits for Instrument Transformer Secondaries,

routed directly to the Meter Security Enclosure without any marshalling

box or conduit openings. Only metering circuit cables must be

contained in the conduits.


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9. Copper Grounding Cable. Cable size is 4/0 Minimum for

connecting the Instrument Transformer housings, grounded

secondaries and the Meter Enclosure to the Substation Ground Mat.

10. Billing Meter(s). The revenue-class meter(s) shall conform with

functional requirements and specifications prescribed under the

Philippine Grid Code and the WESM Metering Manual.

11. Meter Test Block. A 10-pole switch assembly where the instrument

transformer secondary cables terminate and where the meter is

connected for the purpose of isolating the meter from service and

providing a means of injecting test currents and voltages into the meter

when the meter is to undergo accuracy tests.

11.0 Project Bill of Materials

Below is the preliminary requirements of primary devices and accessories at Felisa:

NPSI-Felisa Solar Take-off S/S

ITEMNO.

DESCRIPTIONQUANTIT

YUNIT

A. HV SWITCHYARD EQUIPMENT

1

GENERATOR STEP-UP TRANSFORMER, 13.8/69kV,50/65MVA, 3f, ONAN/ONAF, complete with oil, allappurtenances, accessories, on-load tap changingmechanism,and other required accessories, supportingstructures, anchor bolts, foundations, etc.

1 set

2

POWER CIRCUIT BREAKER, 69kV, 40kA, 2000A, livetank type, suitable for 3 pole operation, complete with allthe required accessories, supporting structures, anchorbolts, foundations, etc.

1 set


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3DISCONNECT SWICTH, 69kV, 40kA, 2000A, withoutEarthing Switch, pedestal mounted, complete with all therequired accessories, anchor bolts, foundations, etc.

2 sets

4

CURRENT TRANSFORMER, 69kV, 4-core with 1metering (Cl 0.2 30VA) and 3 relaying (5P20 100VA),multi-ratio (2000/1500/1000/800/500:5) complete with allthe required accessories, supporting structures, anchorbolts, foundations, etc.

3 each

5

VOLTAGE TRANSFORMER, 69kV, 600/350:1, inductivetype, two secondary winding, 20VA, complete with all therequired accessories, supporting structures, anchor bolts,foundations, etc.

3 each

6

SURGE ARRESTER, 60kV, Metal Oxide, gapless,

complete with all the required accessories, supportingstructures, anchor bolts, foundations, etc. 6 each

7

COMBINED CT/VT, 69kV, for billing, CT: 2 metering core(Cl 0.2S 20VA) 300/150:5 and PT: two secondary winding(Cl 0.2 50VA) 350:1, complete with all the requiredaccessories, supporting structures, anchor bolts,foundations, etc.

3 each

8

SUBSTATION STEEL STRUCTURES for 69kV hot-dipped galvanized complete with mounting bolts andaccessories in accordance with the technical data sheetsand drawings

1 lot

9

STATION INSULATORS for 69kV, string and post (bussupport), complete with all the required accessories,protection against electrolytic corrosion, grading shields,etc.in accordance with the technical data sheets anddrawings

1 lot

10

BUS CONDUCTOR AND HARDWARE for 69kVconsisting of conductors, hardwares, connectors, fittings,clamps, etc. in accordance with the technical data sheetsand drawings

1 lot

11STATION SERVICE TRANSFORMER, 3-phase,complete with all the required accessories, anchor bolts,foundations, etc. in accordance with the drawings.

a. 75kVA, 13.8kV/400V complete with fuse cutout andlightning arrester

1 set

b. 75kVA, 13.2kV/400V complete with fuse cutout andlightning arrester

1 set

12AUXILIARY POWER SUPPLY SYSTEM, complete withall the required accessories, intruments, relays, etc. inaccordance with the drawings.

a. 400/230 VAC Auxiliary Board 1 lot

b. 125 VDC Auxiliary Board 1 lot

c. 48 VDC Auxiliary Board 1 lot


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13STORAGE BATTERIES, complete with all the requiredaccessories, support rack, etc. in accordance with thetechnical data sheets and drawings

a. 125 VDC Battery Bank 2 sets

b. 48 VDC Battery Bank 2 sets

14

BATTERY CHARGER/RECTIFIER, 125 and 48VDC,complete with all the required accessories, intruments,relays, etc. in accordance with the technical data sheetsand drawings

a. 125 VDC Battery Charger/Rectifier 2 sets

b. 48 VDC Battery Charger/Rectifier 2 sets

15UPS POWER SUPPLY SYSTEM, complete with all therequired accessories, intruments, relays, etc. inaccordance with the technical data sheets and drawings

1 set

16DIESEL GENERATOR SET, 60 kW, 400V, 0.8 p.f., 60Hz,complete with all the required accessories, intruments,relays, etc.

1 set

17CABLES, provided with filler and binder tapes,termination kits and accessories, etc. in accordance withthe requirements of the technical data sheets.

1 lot

a. XLPE Power Cable, 15kV Insulation 1 lot

b. Power Cable, 600 V Insulation 1 lot

c. Control and instrumentation Cable, 600V Insulation,shielded 1 lot

18CONDUITS AND CABLE TRAY SYSTEM, various sizes,including, supports, fittings and accessories inaccordance with the technical data sheets and drawings

1 lot

19

GROUNDING SYSTEM for the Substation includingOHGW, air terminals, connectors, fittings, hard-drawncopper conductors, ground rods, mold, powder forexothermic connections, molds, flint guns, etc.inaccordance with the technical data sheets and drawings

1 lot

20

LIGHTING SYSTEM, complete with lighting fixtures,lamps, lamp posts with ground terminals includingfoundation if required, conductor, conduits, switches,boxes, etc., for the switchyard, roadways, perimeter andcontrol building and other indoor establishmentinaccordance with the technical data sheets and drawings

1 lot


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21

CONTROL BUILDING, complete design andconstruction of single-storey building. Reinforcedconcrete/steel structure and pre-painted long spanroofing, roof slab canopy complete with the requiredarchitectural/civil/structural/sanitary/electrical/mechanical to complete to complete the scopeof works for the building in accordance with drawings

1 lot

The transmission connection asset is:

TRANSMISSION LINE

ITEMNO. DESCRIPTION QUANTIT Y UNIT

A. 69kV TRANSMISSION LINE

1

TRANSMISSION LINE comprising of steel poles, poledressing, guying and supports, conductors, insulatorfrom the take-off substation to the designated tappingpoint including reconfiguration of existing NGCP Pole(designated tapping point)

1 km.

2LOAD BREAK SWITCH, 630A, 20kA, 69kV, completewith all the required mounting accessories

2 sets

The secondary devices are summarized as follows:

NPSI-Felisa Solar Take-Off S/S

ITEMNO.

DESCRIPTIONQUANTIT

YUNIT

A. SUBSTATION PROTECTION SYSTEM

113.8/69kV Transformer Protection System, numerical,transformer differential protection

1 set

B. LINE PROTECTION SYSTEM

169kV Line Protection System (Main 1 - line distanceprotection)

1 set

269kV Line Protection System (Main 2 - directionalphase and ground overcurrent protection)

1 set

C. SUBSTATION MONITORING SYSTEM


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1

Network Disturbance Monitoring Equipment fullycompatible with NGCP Master Station complete withaccessories and necessary interface devices (DI: 96 & AI: 32)

1 lot

D. SUBSTATION CONTROL SYSTEM

1Main Control Switchboard complete with mimicdiagram, meters etc.

1 lot

2Remote Terminal Unit complete with interfaceequipment, I/O modules, etc.

1 lot

E. FIBER OPTIC COMMUNICATION SYSTEM

1

Fiber Optic Terminal Equipment, complete with opticaldistribution frame (ODF), access multiplexers,indicators, pigtails, patchcords and otherappurtenances

1 lot

2Fiber Optic Approach Cable, 36 fibers, 1550nm, singlemode

1 lot

No consideration yet on the civil works and additional electrical works that may only

be determined during the detailed engineering design. Variation works may be

expected depending on actual site conditions.

12.0 Project Cost and Assumptions

Assumption in deriving the project cost is based on accuracy of ±10% and already

considered the applicable taxes and contingencies equivalent to same assumptions.

Applicable taxes already considered the applicability of RA 9513 to the proponent.

Acquisition of right-of-way of the line and site, for purposes of this facilities study, are

already excluded including the engineering activities. Interest during construction is

likewise considered for purposes of this interconnection study.

Exchange rates considered is 1US$ to PhP 45.


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For NGCP substation, considering that the existing facilities (Bacolod-San Enrique)

will be used as the interconnection facility, it is assumed that there will be no primary

devices upgrading at the side of NGCP’s substation

13.0 Recommendation

The interconnection scheme (configuration and the line), its associated primary

devices and secondary devices (protection arrangement, telecommunication and

SCADA) and metering are presented based on initial assessment and analysis.

However, there are still needed coordination with NGCP as Grid Owner, System

Operator and Wholesale Metering Service Provider on the following:

1. Submission of major equipment and specifications related to interconnection to

conform with the requirements of NGCP. This does not cover however the plant’s

equipment and specifications including the transformers related to the conversion

from DC to AC and stepping-up to the voltage agreed upon with NGCP;

2. Electrical diagrams and drawings covering the grid assets (i.e., SCADA and

Telecom equipment) shall be approved by NGCP;

3. Procurement of brand acceptable to NGCP will be pursued particularly the

protective equipment;

4. The secondary devices (i.e., SCADA and Telecom equipment) which are all grid

assets per Grid Code will be funded but manufacturer’s drawings shall be approved

by NGCP;

5. Protection equipment shall be provided, owned, operated and maintained by

NGCP and NPHSI at their respective sides but the latter may consider of engaging

the maintenance services of NGCP;

6. Protection setting shall be consistent with the prescribed settings of NGCP to

coordinate with its current protection scheme; and


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7. NPHSI shall coordinate closely with NGCP for the commissioning and testing of

the solar plants following NGCP’s Open Access Policy, Grid Code, OATS Rules

and ERC Resolution No. 7-2014 on the testing of VRE as outline below, the PGC

Minimum Requirements for Large PVS (>20MW):

Specific Requirements Large PVS Field Test LaboratoryTest

Certification

2.1 Generating unitpower output

2.2 Frequency withstand

capability

2.3 Reactive Powercapability

2.4 Performance duringnetwork disturbances

2.5 Voltage Controlsystem

2.6 Active Power Controlsystem

2.7 Power Quality 4.1 Information

Exchange/SCADA Test

0 npsi-felisa solar fs write-up

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