Utility CommunicationsTEBIT for FOX515/512Teleprotection and binary interface

Teleprotection is a key application demanded by any utility communications system. Distance protection relays need to exchange information in order to operate correctly and provide fast reaction times in case of any fault on the power line. Reaction times within milliseconds are essential to prevent damage to industrial assets worth millions of invest-ment.

The relays exchange trip signals between each other which allows the relays to localize a fault faster and more selectively. Such critical applications ask for very fast signal transmission on one hand and for very high dependability (probability to miss a command) and security (probability of a false, unwanted com-mand) on the other.

The communications service needs to be guaranteed at any time, so accordingly highest availability of the teleprotection inter-faces and communications channel needs to be ensured.

The TEBIT Teleprotection interface module provides four com-mand inputs and outputs for distance protection applications and guaranties highest reliability and dependability of the com-munications channel. Continuous supervision of the availability of the data channel, fastest switchover from main to protecting channel (< 5 ms) and automatic loop test for delay measurement make the TEBIT interface the ideal solution for distance protection signal transmission. Accordingly the FOX515 can be directly inter-connected with the protection relay and be used for teleprotec-tion signal transmission via WAN network.

FOX515 can be used as a combined communication/teleprotec-tion equipment and thus provides a unique solution optimised for power utilities. The FOX515/TEBIT solution helps to save costs by providing several benefits such as less space requirements, fully integrated solution with one configuration tool and management system for all services.

2 TEBIT for FOX515/512

Binary data channels– 8 x opto-coupler inputs 24 to 60 VDC– 8 x solid-state relay outputs– All inputs and outputs galvanically isolated– Cross-connect and drop-and-insert facilities for each binary

signal– Point-to-multipoint operation– Transmission of slow data up to 20 bd– 1+1 path protection– Integrated galvanically isolated 24 V auxiliary supply– 8 x binary signals per 64 kbit/s channel

TEBIT architectureThe TEBIT is part of a large complement of interface modules which can be plugged into a FOX515 shelf. Like all FOX515 modules TEBIT is:

– powered from the FOX515 shelf– configured by UCST and– supervised by FOXMAN-Management system

Two front connectors provide access to the teleprotection and binary inputs and outputs.

Alarm states are displayed by LEDs. TEBIT includes a non volatile event recorder with an outstanding accuracy, syn-chronizable with the GPS system and trip counter. Cyclic loop tests allow permanent channel monitoring, and add/drop fea-tures allow efficient use of bandwidth. All Teleprotection inputs and outputs are galvanically isolated and provide highest EMC immunity for harsh environment. The TEBIT has an integrated cross connect with drop and insert functionality for single com-mands.

TEBIT – outstanding features for ABB's demanding customers

Specially designed for utilities The TEBIT interface has been specifically designed for distance protection applications. Therefore it provides exactly the fea-tures required by power utilities. Having a fibre optic multiplex-er integrated solution allows to provide optimized end to end solutions for your mission critical application. Besides, TEBIT also saves space and ensures full supervision by the network management system (FOXMAN).

TEBIT at a glance– 4 x command inputs for trip signals– 4 x outputs for solid state trip signals– 2 x programmable auxiliary relay which can be used e.g.

for alarm outputs– 8 x inputs and outputs for binary signal transmission– Nonvolatile event recorder with GPS synchronization and

trip counter– All inputs and outputs are galvanically isolated and with

high EMC immunity for harsh environment– 1+1 path protection with very fast switchover time (< 5 ms)– Supports point to point and Tee-line configuration

The command inputs of TEBIT have been designed for direct connection to the protection relay. They are software configu-rable for trip voltage levels from 24 to 250 VDC.

TEBIT complies to Teleprotection standard IEC 60834-1 and can be configured for:– Permissive tripping– Intertripping– Blocking / non-blocking– Tee-lines (normal or inverse)– Security, dependability and transmission speed

programmable as per requirements– Continuous performance monitoring for each command

channel– 4 x protection signals per 64 kbit/s channel– Trip transmission time measurement

SFC’s addressing scheme prevents false tripping due to rerouted channels

FOX 515 Network

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An wrongly rerouted channel will be detected by means of the SFC address

An 8 bit command addressing scheme ensures correct cross connection and the very fast 1+1 switchover in case of link failure ensures highest reliability of the communication channel.

TEBIT for FOX515/512 3

TEBIT in Tee-off configuration

Operation mode ‘Speed optimized’Recommended for use with teleprotection schemes: Permissive tripping (blocking/unblocking)

Delay times for point-to-point transmission (excluding line propagation delay):

min. typ. max.

Input voltage 24 – 125 V 220/250 V 24 – 125 V 220/250 V 24 – 125 V 220/250 V

Trip immunity time 0.5 ms 1.4 ms 0.7 ms 1.6 ms 1.0 ms 1.8 ms

Transmission delay time 1.9 ms 1.9 ms 2.4 ms 2.4 ms 3.1 ms 3.1 ms

Propagation delay time 2.4 ms 3.3 ms 3.1ms 4.0 ms 4.1 ms 4.9 ms

Operation mode ‘Security optimized’Recommended for use with teleprotection schemes: Intertripping (direct transfer tripping)

Delay times for point-to-point transmission (excluding line propagation delay):

min. typ. max.

Input voltage 24 – 125 V 220/250 V 24 – 125 V 220/250 V 24 – 125 V 220/250 V

Trip immunity time 1.5 ms 2.4 ms 2.1 ms 3.0 ms 3.0 ms 4.8 ms

Transmission delay time 3.0 ms 3.0 ms 3.6 ms 3.6 ms 3.8 ms 3.8 ms

Propagation delay time 4.5 ms 5.4 ms 5.7 ms 6.6 ms 6.8 ms 7.8 ms

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TEBIT – optimised teleprotection solution

Table 1: Delay times operation mode speed optimized’

Table 2: Delay times operation mode security optimized’

The TEBIT module provides two different operation modes which should be chosen depending on the protection scheme. Table 1 and 2 show the applicable delay times.

It is possible to protect more than one power line using one TEBIT module (e.g. if only two commands are used per power line). Station C of the picture below shows such a configura-tion. Station A, B and C are connected in a Tee-line configu-

ration. Trip signals (Trip signal 1 and 2) are broadcast to the two opposite stations. Trip-signal 3 and 4 are configured in a point-to-point connection. A GPS receiver provides an ac-curate time reference for the event recorder.

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Technical data

Teleprotection inputs / outputs

Command inputs 4

Nominal input voltage Threshold

24 VDC up to 250 VDC configurable with UCST 60% of nominal input voltage

Command outputs 4 (PowerMosFET normally open)

Tripping command 250 VDC, ≤ 2 A, Ton/Toff ≤ 1/3; Ton ≤ 5 min

Continuous command 250 VDC; ≤ 1 A

Aux. outputs 2 relays, NO/NC contacts

Contact load 16 ... 250 VAC or DC; max. 150 W ≤ 10 A (max. 100 ms) ≤ 50 A (max. 1 ms) 2 A continuous

Propagation delay time Typical 3.5 ms (optimized for speed 24 ... 125 VDC)

Standard compliance IEC 60834–1

Binary signal inputs / outputs

Binary inputs 8 (Opto coupler)

Nominal input voltage 24, 48, 60 VDC; low -72 ... +9 VDC; high +18 ... +72 VDC

Input current low ≤ 1.5 mA; high 3 ... 12.5 mA

Binary outputs 8 (PhotoMOS, normally open)

Nominal output voltage 24, 48, 60 VDC

Contact load low ≤ 1.5 mA;

≤ 0.5 A for max. 100 ms; ≤ 0.2 A continuous

On-resistance ≤ 6 Ω

Aux. voltage supply 24 VDC +5% ... -20% ≤ 40 mA continuous, short circuit protected

GPS synchronization input IRIG-B DC-level (unmodulated)

Isolation 3,000 Vrms 1 min between protection circuit and equipment 1,500 Vrms 1 min between protection circuits and earth 708 Vrms 1 min for binary circuits 500 Vrms 1 min for aux voltage

EMC IEC61000-4-2 / 3 / 4 / 5 / 6 / 12IEC01255-5 / -22-1

For more information please contact:

ABB Switzerland Ltd.Power SystemsBrown Boveri Strasse 65400 Baden, SwitzerlandPhone: +41 58 589 37 35or +41 844 845 845 (Call Center)Fax: +41 58 585 16 88E-Mail: utilitycommunications@ch.abb.com

www.abb.com/utilitycommunications

List of abbreviations

GPS Global Positioning System

NC Normally closed

NO Normally open

SFC Secure Frame Concept

UCST Configuration tool for FOX515/512

WAN Wide Area Network