Product Scope; Functional Overview - GE P741 Technical Manual

P74x/EN IT/Na7
(IT) 1-6
3.

PRODUCT SCOPE

The P74x differential busbar protection relays have been designed for the protection of a
wide range of substation busbars from distribution to transmission voltage levels. The relays
include a comprehensive range of non-protection features to aid with system diagnosis and
fault analysis. The P74x offers integral biased differential busbar, breaker failure, dead zone,
overcurrent and earth-fault protection and is suitable for application on solidly grounded,
impedance grounded, Petersen coil grounded and isolated systems. The relays are
IT
especially suitable where a complete scheme solution is required.
The scheme comprises of three relays:
•
The P741 (Central Unit),
•
The P742 and P743 (Peripheral Units).
Which, together with the topology configuration software and the dynamic synoptic
monitoring tool, allow full flexibility for all configurations.
3.1

Functional overview

The P74x Busbar protection contains a wide variety of protection functions. The protection
features are summarized below:
ANSI IEC 61850
87BB / P PhsPDIF
87CZ / P CzPPDIF
87BB / N NeuPDIF
87 CZ/ N CzNPDIF
50 / 51 / P OcpPTOC
50 / 51 / N EfmPTOC
50ST / P DzpPhsPTOC Dead zone phase protection (short zone between CTs and
50ST / N DzpEfmPTOC Dead zone earth protection (short zone between CTs and
CTS
50BF RBRF
ISL
OptGGIO
RlyGGIO
FnkGGIO
LedGGIO
* Refer to the data sheet for model selection
Protection Functions Overview
Function
Phase segregated biased current differential high speed and
delayed busbar protection
Check Zone segregated biased phase current differential
high speed and delayed busbar protection
Sensitive earth fault bias current controlled busbar protection
Check Zone segregated biased earth current controlled
busbar protection
Phase overcurrent protection (2 stages)
Earth overcurrent protection (2 stages)
open CBs)
open CBs)
Current transformer supervision
Breaker failure protection (LBB)
Isolator discrepancy alarm
Fibre optic signalling channel
Digital inputs (according to product) *
Output relays (according to product) *
High Break relays (according to product) *
Virtual Digital inputs (via fibre communication)
Virtual Output relays (via fibre communication)
Front communication port (RS232)
Rear communication port (Kbus/EIA(RS)485)
Second Rear communication port (Kbus/EIA(RS)485)
Rear communication port (Ethernet) *
Time synchronisation port (IRIG-B) *
Redundant Ethernet port
Function keys
Programmable tri-colour LEDs
Introduction
MiCOM P741, P742, P743
P741 P742 P743
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• •
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8 8/16 16/24
8 8/12 12/16/20
4 4/8
16 16 16
16 16 16
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Option - Option
Option Via CU Via CU
Option - Option
10 - 10
18 - 18