Communication NetworksOPIC1 for FOX615/612IEEE C37.94 communication interface

One of the most important applications used by any power utility is protection of high voltage power lines. Protection relays, which provide the protection functionality for power lines, need to exchange information in order to ensure correct operation. The utility's captive communications network is normally used to provide reliable communications channels for protection applications. Such communications channels demand highest availability and performance figures, espe-cially for differential protection applications which require very low and symmetrical end-to-end delay times.

Transmitting protection relay data channels via communication network instead of direct relay connection using dedicated fibres has the big advantage of complete supervision of the data chan-nel and the possibility for redundant channel routing. Beside this it also saves fibres, which are valuable assets. Supervision of the data channel and redundant channel routing allow to significantly increase the availability of protection applications.

The substation environment is usually characterized by a high level of electromagnetic fields caused by high voltages and currents in power lines. Specially during fault conditions the same can rise significantly and disturb communications channels based on copper wires. So it is recommended to use a complete optical interconnection from relay to relay via fibre optical multiplex equip-ment using the IEEE C37.94 protocol.

The IEEE C37.94 standard defines the communication of protec-tion equipment (protections relays) with communications equip-ment inside a substation using optical fibers. Accordingly no additional extern converters are required anymore. This standard is already implemented by many protection relay manufactur-ers around the world. ABB’s latest relay series REx670 and the teleprotection equipment NSD570 support this standard as well.The OPIC1 module extends the FOX615/612 platform with IEEE C37.94 interfaces while ensuring compatibility with the traditional ABB SFC protocol used by legacy ABB protection relays.

2 Communication Networks | OPIC1 for FOX615/612

differential protection data channels. This ensures equal delay times on transmit and receive paths under all circumstances and therefore avoids the possibility for false tripping of the protection relay due to asymmetrical delay times.

Main features– Fully supporting IEEE C37.94 (64 – 768 kbit/s pay load)– 4 ports individually configurable for: – IEEE C37.94 on 850 nm multi mode fiber

– ABB’s proprietary SFC protocol on 1310 nm single-mode fiber

– All 4 optical ports using SFPs, supporting multimode and single-mode fibers depending on selected type of interface

– Transmission delay time: Fully symmetrical bidirectional communication on normal operation and also in protected mode (working and protect-ing path)

– Fully integrated in FOX615/612 platform (1 mechanical slot)

For connections based on ABB’s SFC protocol, SFPs for single-mode fibers on 1310 nm are required. This solu-tion has been successfully implemented for many years in substations around the world together with ABB’s protection relays REL316, REL551, REL561 or teleprotection equipment NSD570 (G1LO-interface).

Management SystemThe FOX615 with a variety of services are managed centrally by FOXCST/FOXMAN management system. Utilities save costs and accelerate the circuit provisioning process with only one element manager for all service types.

Applications with OPIC1FOX615 collects all utility specific signals and transmits the same through Wide Area Networks (WAN) using fibre optical or copper interfaces. Therefore the FOX615 provides standard data interfaces and utility specific interfaces such as the OPIC1 module which provides up to four ports for differential protection signal transmission. With FOX615 and OPIC1 Differential Protection is just one application of many and does not require special measures such as special channel routing or dedicated fibres in order to ensure correct operation.

OPIC1 architecture The OPIC1 is part of a large complement of interface modules which can be plugged into a FOX615/FOX612 shelf. Like all FOX615 modules OPIC1 is– powered from the FOX615 shelf– configured by FOXCST and– supervised by FOXMAN management system4 optical ports equipped with SFPs on the front allow individual configuration to support either– ANSI/IEEE C37.94 standard or– ABB’s traditional SFC protocol

Symmetric transmission delayDifferential protection relays usually calculate the delay times of the data channel by a round trip delay measurement. Therefore asym-metrical delay times can not be detected and lead to the possibility of wrong trips.

OPIC1 solves this problem by ensuring the same data routing for the transmit and receive paths. In case of redundant channel configuration, OPIC1 ensures symmetrical protection switching for

FOX615 multi-service multiplexer

With OPIC1 differntial protection is just one application of many

OPIC1 for FOX615/612 | Communication Networks 3

General

Designed for FOX615/612, TDM-BUS access

Number of ports 4

Optical ports All optical ports require SFP for: – 850 nm (multimode) or – 1310 nm (single-mode)

Operation mode IEEE C37.94 or ABB TPE

Module width 1 mechanical slot in FOX615

Environmental conditions According to FOX615 specification

Configuration tool FOXCST

Maintenance Local and remote test loops available

Typical 1+1 switchover time

≤ 25 ms

Standard compliance IEEE C37.94 / IEC 62843

MTTF > 60 years

Technical data

SFP transceivers The optical parameters are subject to the selected SFP transceiver module. The following table shows the characteristics of the SFP transceiver modules approved for these applications:

Interfaces

Interface type IEEE C37.94 ABB type

Max port number 4 4

Type of port (Connector) Optical SFP (LC-PC) Optical SFP (LC-PC)

Framing complying to ANSI/IEEE C37.94 ABB SFC protocol

Data transmissionN x 64 kbit/s (N = 1 ... 12) 64 kbits/s – 768 kbit/s or 2,048 kbit/s transparent

N x 64 kbit/s (N = 1 ... 3)[Ch1, Ch2, RemAlm]

Transmission bit rate 2,048 kbit/s optical 4,096 kbit/s optical

Signal bit rate 2,048 kbit/s 2,048 kbit/s

Optical line coding NRZ MCMI

Optical parameters IEEE C37.94 compliant ABB SFC protocol

Application example RED670NSD570/G1LOa

REL316, REL551, REL561NSD570/G1LO

Wavelength 850 nm 1310 nm

Fiber type Multimode Single-mode

Optical output power (Tx)-19 ~ -11 dBm (62.5μm)-23 ~ -9 dBm (50μm)

-15 ... -8 dBm

Max allowed optical input power -3 dBm -3 dBm

Optical power budget, min13 dBm (62.5μm)11 dBm (50μm)

19 dB

Receiver sensitivity -32 dBm -34 dBm

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Type Despription Order number

OPIC1 Optical Teleprotection Interface 1KHW002237R0001

SFP SFP Transceiver 850 nm, multimode 1KHW001871R0005

SFP SFP Transceiver 1310 nm, single-mode 1KHW001872R0001

Optical cables: multimode

V9YE Duplex LC to ST, outside cabinet, 10 m 1KHW027541R0100

V9YF Duplex LC to LC cable, outside cabinet, 10 m 1KHW027542R0100

V9YG Duplex LC to LC cable, inside cabinet, 2 m 1KHW027543R0020

Optical cable: single-mode

V9KZ Duplex LC - FC/PC cable, outside cabinet, 10 m 1KHW027499R0100

V9KX Duplex LC - LC cable, outside cabinet, 10 m 1KHW027497R0100

V9KW Duplex LC - FC/PC cable, inside cabinet, 2 m 1KHW027496R0020

V9KU Duplex LC - LC cable, inside cabinet, 2 m 1KHW027494R0020Other lengths available on request.

List of abbreviations

MCMI Modified Code Mark Inversion

NRZ Non Return to Zero

SFC Secure Frame Concept

SFP Small Form Pluggable

FOXCST Configuration Tool for

FOX615/612

For more information please contact:

ABB Switzerland Ltd. Power SystemsBruggerstrasse 72 5400 Baden, Switzerland Phone: +41 58 585 77 44Fax: +41 58 585 55 77 E-Mail: communication.networks@ch.abb.com www.abb.com/communicationnetworks

OPIC1 ordering information

Substation relay & telecom cabinet

Relay cabinet

Opticalconnector

Fiber pair Max. 4 ports

(up to 2 km)

SFP with LC-connectorIE

EE

C37

.94

FOX615OPIC1

Telecom cabinet

Opticalconnector

Substation

AB

B S

FC

Patch panel

3rd party

RED 670

NSD570

REL316REL551REL561

FOX6Plus