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P741
Technical manual
GE P741 Technical Manual
Busbar differential protection relay
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Table Of Contents
561
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561
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561
Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
P74X/En It/Na7
Documentation Structure
Introduction to the Unit
Functional Overview
Product Scope
Figure 1: Functional Diagram
Ordering Options
P74X/En Td/Na7
Technical Data
Mechanical Specification
Enclosure Protection
Terminals Data
Ratings
Transmitter Optical Characteristics
Power Supply
Operating Range
Output Contacts
Environmental Conditions
Type Tests
Electromagnetic Compatibility (EMC)
Mechanical Robustness
IRIG-B and Real Time Clock
Dead Zone Protection
Busbar Protection
Performance Data
Protection Functions
Ethernet Data
Current Transformer and Feeder Characteristics
Dead Zone Protection (PU)
Breaker Failure Protection (PU)
Overcurrent Protection (PU)
Configuration
Earth Fault Protection (50N/51N)
Date and Time
CB Control (PU)
Measurements and Records List
Communications
Oscillography (Disturbance Recorder)
Optional Ethernet Port
Commission Tests
P74X/En Gs/Na7
Front Panel
Getting Started
User Interfaces and Menu Structure
Figure 2: Relay Front View (Example for P743 – 60 Te)
LED Indications
The Default Mappings for each of the Programmable Leds
Relay Rear Panel
Figure 4: P743 Relay Rear View 60Te
Introduction to the User Interfaces and Settings Options
Relay Connection and Power-Up
Menu Structure
Control and Support Settings
Disturbance Recorder Settings
Password Protection
Protection Settings
Front Panel User Interface (Keypad and LCD)
Relay Configuration
Default Display and Menu Time-Out
Control Inputs – User Assignable Functions
Hotkey Menu Navigation
Menu Navigation and Setting Browsing
Setting Group Selection
Password Entry
Reading and Clearing of Alarm Messages and Fault Records
Front Communication Port User Interface
Setting Changes
Figure 9: Front Port Connection
Front Courier Port
S1 Agile Relay Communications Basics
Off-Line Use of S1 Agile
Configuring the Ethernet Interface
Configuring the Board IP Address
Configuring the IED IP Address
Configuring the Redundant Ethernet Board
RSTP Configuration
Device Identification
IP Address Configuration
SNTP IP Address Configuration
RSTP Parameters
Bridge Parameters
Port Parameters
Port States
Configuring the Data Protocols
Courier Configuration
IEC 61850 Configuration
IEC 61850 Configuration Banks
IEC 61850 Network Connectivity
Connecting the IED to a PC
Installing the Configurator
PRP/HSR Configurator
Starting the Configurator
Check for Connected Equipment
PRP Configuration
PRP/HSR IP Address Configuration
Selecting the Device Mode
Filtering Database
HSR Configuration
End of Session
Filtering Entries Tab
Goose Filtering Tab
P74X/En St/Na7
Settings
Relay Settings Configuration
“System Data” Column
Central Unit P741
“Configuration” Column (P741 Central Unit)
“Configuration” Column (P742 / P743 Peripheral Units)
“PU Conf & Status” Column (P741 Central Unit)
Default Settings Restore
“Date and Time” Column
Differential Phase Fault Configuration
Differential Protection Configuration
Sensitive Earth Fault Element
Busbar Trip (87Bb)/Central Breaker Fail Backtrip Confirmation (50BF)
Dead Zone Configuration
Non-Directional Phase Overcurrent Protection
Circuit Breaker Fail and Undercurrent Function
CT Supervision
Circuit Breaker Control
“CT and VT Ratios” Column
“Record Control” Column
Measurements (“Measure’t Setup” Column)
Courier Protocol
Ethernet Port
“Communications” Column
Rear Port 2 Connection Settings
“Commissioning Tests” Column
Opto Configuration (“Opto Config” Column)
Control Input Setting (“Control Input” Column)
Intermicom Communications
Control Input Configuration (“Ctrl I/P Config” Column)
“Intermicom Comm and Conf” Columns
Intermicom Configuration
“Function Keys” Menu
“IED Configurator” Column
“Control I/P (Input) Labels” Column
Disturbance Recorder Settings Tables
P74X/En Op/Na7
Operation
Operation of Individual Ptorection Functions
Busbar Biased Current Differential Protection
Application of Kirchoffs Law
Bias Characteristic and Differential Current
Scheme Supervision by "Check Zone” Element
Busbar Protection Operation
Bias Characteristic and Differential Current Setting
Scheme Earth Characteristic Element
Threshold Coherency
Signal Quality
Tripping Criteria
Trip Duration
Current Circuit Supervision
Protection Options for the Zones
Options for a Circuitry Fault
Options for a PU Error Mode
Protection Options for the Check Zone
Vt(S) Connected to the Line(S) and a Peripheral Unit
Vt(S) Connected to the Bar(S) and the Central Unit
Voltage Criteria for Busbar Protection
Busbar Protection Tripping Order PU Logic
Dead Zone Protection (DZ)
Stub Protection
Busbar Protection Tripping Time Delays
Overcurrent Criterion
Undercurrent Reset Criterion
Circuit Breaker Fail Reset Criteria
Circuit Breaker Fail (CBF)
Principle of the Undercurrent Function
CB Element Logic
Logic Reset Criterion
Logic and Current Reset Criterion
Processing a Circuit Breaker Failure Condition
CB Fail Logic
Internally Initiated CBF
Back-Trip after Time Tbf2
Initial Trip
Re-Trip after Time Tbf1
Description of the Logic for Internally Initiated CBF
Circuit Breaker Failure Logic
General Zone Trip after Time Tbf4
Externally Initiated 50BF
Local Re-Trip after Time Tbf3
Three Phase Overcurrent Protection
CB Fail Alarm
Separate External 50BF Protection to the Busbar Protection
Inverse Time (IDMT) Characteristic
Earth Fault Protection
EF Time Delay Characteristics
External Fault Detection by High-Set Overcurrent/Earth Fault Element
Zero Sequence Current Supervision
Intermicom Teleprotection Introduction
Protection Signaling
Definition of Teleprotection Commands
EIA(RS)232 Intermicom (“MODEM Intermicom”)
Communications Media
Pictorial Comparison of Operating Modes
General Features & Implementation
EIA(RS)232 Physical Connections
Direct Connection
Modem Connection
Functional Assignment
Intermicom Statistics & Diagnostics
Current Transformers
CT Saturation Detection
Current Variation
Determinatoin of Signal Quality in Peripheral Unit
CT Saturation Reset
CT Location
Isolator and Circuit Breaker Function
Isolator State Monitoring Features
Circuit Breaker State Monitoring Features
CB State Monitoring Features Diagram
Remote Control of Circuit Breaker Diagram
Differential Current Display
Operation of Non Protection Functions
IRIG-B Signal (P741) Only
Programmable Scheme Logic
Communications between PU and CU
Communications Link
Direct Optical Fibre Link, 850Nm Multi-Mode Fibre
Optical Budgets
Trip LED Logic
Function Keys
CB Control Using Hotkeys
CB Control Hotkey Menu Diagram
CB Control Via Function Keys Default PSL Diagram
CB Control Using Function Keys
Setting Groups Selection
Control Inputs
P74X/En Ap/Na7
Application Notes
Protection of Substation Busbars
87BB Phase CU Settings (Solid Earthed Network Schemes)
Application of Individual Protection Functions
Busbar Protection Setting Guidelines
Sub-Station Features
“Idiff_Ibias” Setting Calculation Spreadsheet
Differential Busbar Protection
87BB CU Settings (Compensated Earthed Network Schemes)
87BB SDEF CU Settings (High Impedance Earthed Schemes Only)
Sub-Station Features - 8 Values
“Idiff_Ibias_Sdef_Highimp” Setting Calculation Spreadsheet
SDEF Busbar Protection
Busbar Protection Tripping Times
Busbar Protection Tripping Time Delay in a PU
Busbar Protection Tripping Time Delay in the CU
Over Current Protection (OC)
Earth Fault Protection (EF)
Transformer Feeder Example
CT Features
Setting Guidelines
Current Transofmers
“Low Voltage” Current Transformers Supervision
“High Voltage” Current Transformers Supervision
Circuit Breaker Function
Circuit Breaker State Monitoring
Trip Relays and Trip Circuit Supervision
TCS Scheme
Scheme 1 Optional R1 Opto Input Resistor Values
Scheme 1 PSL
TCS Scheme 2
Scheme 2 PSL
Scheme 3 Optional R1, R2 & R3 Opto Input Resistor Values
TCS Scheme 3
Scheme 3 PSL
CB Failure Protection (50BF) Disabled
Peripheral Units (P742 and P743)
Isolation and Reduced Function Mode
PU - Overhaul
Forcing Plant Position State
Central Processing Unit
Busbar Protection (87BB) Blocked
87BB Blocked & 50BF Disabled
System Operation under Failed Communications Situation
Waiting Configuration
Topology
Topology Configuration Tool
Nodal Assignment
Topology Communication
Topology Data
Topology Processing
Single Bar or Double Bus with Bus Sectionaliser
Double Bus with One CT Bus Coupler
Double Bus with Two CT Bus Coupler
Cts on One Side of Bus Coupler, CB Closes before Status Acquisition
Cts on One Side of Bus Coupler/Cb Closed/Fault Evolves between CT, CB
Cts on both Sides of Bus Coupler, CB Closes before Status Acquisition
Cts on both Sides of Coupler/Cb Closed/Fault Evolves between CT and CB
Undertaking a Numerical Differential Busbar Protectin Project
General Substation Information
Short Circuit Levels
Switchgear
Cubicle Specifications
Substation Architecture
Single Busbar Application with Bus Section Isolator
Standard Configurations
Single Busbar Application with Bus Section Circuit Breaker
Breaker and a Half Scheme
Double Busbar Application with Bus Coupler
Traditional Double Busbar Application with Bus Coupler and Bus Section
Triple Busbar Application with Bus Coupler and Bus Section
Double Bus Bar with Two Circuit Breakers Per Feeder
Mesh Corner Diagram
Six Main Bus for S/S CB Bus-Sections and CB By-Pass
Application of Non Protection Functions
Commissioning Mode Default PSL
CT Requirements
87BB Phase CT Requirements
Feeders Connected to Sources of Significant Power
Out of Service Feeders or those with Low Power Contribution
CT Specification According to IEC 185, 44-6 and BS 3938
87BB Sensitive Differential Earth Fault CT Requirements
Support of IEEE C Class Cts
Auxiliary Supply Fuse Rating
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Technical Manual
Busbar Differential Protection Relay
Hardware version: J and K
Software version: 51
Publication reference: P74x/EN M/Na7
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Table of Contents
Troubleshooting
Troubleshooting
452
Incorrect analog signals
472
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