ECP 11-0515b Lucy HV Air Metering Unit 5 Limb Test Form

Lucy HV Air Metering Unit 5 Limb Test Form

Full Postal Address

Import MPAN

Export MPAN

Substation Name

Substation Number

Metering Unit Serial No

Metering Unit Make/Type

Lucy Sabre AMU

System Configuration

3-PHASE 3-WIRE

Current Transformer

L1

L2

L3

Location

METERING UNIT

METERING UNIT

METERING UNIT

Serial Number **

Burden (output VA) ***

VA

VA

VA

Accuracy Class

0.5

0.5

0.5

Make ***

Type

WOUND

WOUND

WOUND

Available Ratios

400/200/100/5A

400/200/100/5A

400/200/100/5A

Ratio Selected

A

A

A

Pole P1 Facing Distribution System?

YES / NO *

YES / NO *

YES / NO *

Voltage Transformer

L1

L2

L3

Location

METERING UNIT

METERING UNIT

METERING UNIT

Serial Number **

Burden (output VA) ***

VA

VA

VA

Accuracy Class

0.5

0.5

0.5

Make**

Type

3P

3P

3P

Available Ratios

11000/6600/110V

11000/6600/110V

11000/6600/110V

Ratio Selected

V

V

V

* Delete as applicable. ** Available from manufacturers test certificates. *** Available from nameplate.

Voltage Transformer Tests

VT Configuration Checks

Check metering multi-core cable disconnected

()

Check correct metering VT ratio selected (terminals 31 to 39) see TABLE 1 below

()

Ensure label on lid of terminal box matches VT voltage ratio selected

()

Check correct NPD VT Ratio selected (terminals 47 to 55) see TABLE 2 below

()

Check LV VT fuse ratings are correct (6A) and continuity (L1, L3 & N)

()

Check NPD fuse ratings are correct (2A) and continuity (da )

()

Check 110V auxiliary fuse ratings are correct (2A) and continuity

()

Check LV fuses and links are installed

()

Check HV links are closed in tank

()

TABLE 1 Metering VT Voltage Range Selection

Phase

Metering VT 11000/110V

Common Terminal

Metering VT 6600/110V

L1

E210 (33)

E11 (32)

E110 (31)

L2

E230 (36)

E31 (35)

E130 (34)

L3

E250 (39)

E51 (38)

E150 (37)

TABLE 2 NPD VT Voltage Range Selection

Phase

NPD VT 11000/110V

Common Terminal

NPD VT 6600/110V

L1

E510 (49)

E185 (48)

E410 (47)

L2

E530 (52)

E171 (51)

E430 (50)

L3

E550 (55)

E173 (54

E450 (53)

VT Resistance Tests

Check secondary earth links in place (terminal 46 and 58)

()

Measure the resistance of the VT L1 primary winding (L1 to Earth) *

k

Measure the resistance of the VT L2 primary winding (L2 to Earth) *

k

Measure the resistance of the VT L3 primary winding (L3 to Earth) *

k

Measure the resistance of the VT L1 to L2 primary winding *

k

Measure the resistance of the VT L2 to L3 primary winding *

k

Measure the resistance of the VT L3 to L1 primary winding *

k

* Measure from the HV bushing or busbar in HV metering unit to earth, the resistance of the star connected VT to earth is 1 to 2 kΩ and 2 to 4 kΩ between phases using a multi-meter

VT Insulation Resistance – 1kV Insulation Resistance Tester

Disconnect the secondary earth links (terminal 46 and 58)

()

Measure insulation resistance of metering VT secondary (across terminal 46)

M

Measure insulation resistance of NPD VT secondary (across terminal 58)

M

Reconnect the secondary earth links (terminal 46 and 58)

()

VT Phasing Check – Primary Injection

Remove fuses and links L1, L2, L3 and N also fuses da and cn

()

Check the metering circuit breaker is open

()

Apply 240/110V ac from an injection test set to the primary (HV) winding, measure each of the secondary (LV) winding voltages and compare to the values in the table below *

Primary (HV) Winding Voltage

HV

Secondary (LV) Winding Voltage (measured at fuse)

NPD da–cn**

L1 – L2

L2 – L3

L3 – L1

L1 L2

V

V (nominal)

V (< nominal)

V (< nominal)

L2 L3

V

V (< nominal)

V (nominal)

V (< nominal)

L3 L1

V

V (< nominal)

V (< nominal)

V (nominal)

Replace fuses L1, L2 and L3 (6A)

()

Replace fuses da and cn (2A)

()

* These voltages are for an injection test set and if a mains supply is used the results may differ.

** The NPD voltage measured should be in the order of 0.5 to 2V.

VT Primary (HV) Rated Voltage

VT Nominal Secondary (LV) Winding Voltage with 240/110V applied to the Primary (HV) Winding

240V

110V

11kV

2.4V

1.1V

6.6kV

4.0V

1.8V

Current Transformer Tests

CT Insulation Resistance – 1kV Insulation Resistance Tester

CTs isolated or HV dead

()

Disconnect CT star point earth (terminal 20)

()

Measure the insulation resistance (D70 – D90 at terminal 20)

M

Reconnect CT star point earth (terminal 20)

()

CT Ratio Check – Primary Injection or Prevailing Load*

Phase

CT RatioPrimary Current

CT Ratio Secondary Current

Injected Primary Current*

Calculated Secondary Current

Measured Secondary Current

Ratio Correct

[A]

[B]

[C]

[D = B / A * C]

[E]

[E = D]

L1

100A

5A

50 / 100A

A

A

A

()

L2

100A

5A

50 / 100A

A

A

A

()

L3

100A

5A

50 / 100A

A

A

A

()

L1

200A

5A

50 / 100A

A

A

A

()

L2

200A

5A

50 / 100A

A

A

A

()

L3

200A

5A

50 / 100A

A

A

A

()

L1

400A

5A

50 / 100A

A

A

A

()

L2

400A

5A

50 / 100A

A

A

A

()

L3

400A

5A

50 / 100A

A

A

A

()

On completion of test ensure correct CT ratio 3 (100A), ratio 2 (200A) or ratio 1 (400A) as specified by designer is selected

()

* Delete as applicable.

CT Polarity – Flick Test

Check L1 phase CT polarity – secondary CT connection D11 (+ve) to D70 (-ve)

()

Check L2 phase CT polarity – secondary CT connection D31 (+ve) to D70 (-ve)

()

Check L3 phase CT polarity – secondary CT connection D51 (+ve) to D70 (-ve)

()

CT Relationship to VT Output

L1 CT associated with L1 voltage **

()

L2 CT associated with L2 voltage **

()

L3 CT associated with L3 voltage **

()

** If all CT and VT tests are correct the CT relationship to the VT is proven and the above can be ticked

CT Burden

Maximum CT burden per phase at metering unit terminal box

0.5

VA

Maximum CT burden per phase at meter terminal box [footnoteRef:1] [1: The maximum CT burden is based on 20 metres of 12-core 2.5mm2 or 40 metres of 19-core 2.5mm2 copper cable with a resistance of 0.0068 Ω/m at 20oC and a CT rated secondary current of 5A.]

7.5

VA

Final Checks

Reconnect metering multi-core cable (if disconnected)

()

If metering multi-core cable is not connected leave CTs shorted (D11, D31,D51, D70)

()

Check all covers are secured and appropriate lock fitted to lid

()

Complete asset data form and submit to ART

()

Test Equipment

Purpose/Make/Type

Serial Number

Calibration Expiry Date

Certification

CT and VT calibration certificates attached

()

All tests completed satisfactorily

()

Comments

Organisation

Test Operative Name

Date of Tests

Test Operative Signature

A copy of the completed test form together with the CT/VT calibration certificates shall be placed in a plastic wallet in the metering unit terminal box.

A copy of the completed test forms and the CT/VT calibration certificates shall be sent to the ART mailbox (ART.EPN@ukpowernetworks.co.uk, ART.LPN@ukpowernetworks.co.uk, ART.SPN@ukpowernetworks.co.uk).

A copy of the completed test form and the CT/VT calibration certificates shall also be attached to the relevant operation on the work order or the relevant PO in the contractor portal.

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THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE

Document Number: ECP 11-0515b

Version: 4.0

Date: 27/06/2018

Lucy HV Air Metering Unit 5 Limb Test Form

Document Number: ECP 11-0515b

Version: 4.0

Date: 27/06/2018

© UK Power Networks 2018 All rights reserved 6 of 6

Figure 1 – Lucy Air Metering Unit

Figure 2 – Lucy AMU Legend and Wiring Diagram on Rear of Terminal Box Cover

Figure 3 – Lucy AMU Terminal Box Cover with Selected VT and CT Ratios (example only)

Figure 4 – Lucy AMU Terminal Box with Cover Removed