Siemens siprotec 7SD5 User Manual

2.24 Ancillary Functions
427
7SD5 Manual
C53000-G1176-C169-1
2.24.5 Differential Protection Values
2.24.5.1 Measured Values of the Differential Protection
The differential, restraint and charging current values of the differential protection
which are listed in the following table can be called up at the front of the device, read
out via the operator interface using a PC with DIGSI
®
or transferred to a central master
station via the system interface.
Table 2-21 Measured values of the differential protection
1)
for lines according to address (see Section 2.1.4), for transformers calculated from address (see Section 2.1.4)
I
N
=S
N
/(√3·U
N
)
2.24.5.2 Information List
Measured Values % Referred to
IDiff
L1
, IDiff
L2
, IDiff
L3
Calculated differential currents of the three phases Nominal operational current
1)
IRest
L1
, IRest
L2
, IRest
L3
Calculated restraint currents of the three phases Nominal operational current
1)
IDiff
3I0
Calculated differential current of the zero sequence system Nominal operational current
1)
Ic
L1,
Ic
L2
, Ic
L3
Measured charging currents of the three phases Nominal operational current
No. Information Type of In-
formation
Comments
7742 IDiffL1= MV IDiffL1(% Operational nominal current)
7743 IDiffL2= MV IDiffL2(% Operational nominal current)
7744 IDiffL3= MV IDiffL3(% Operational nominal current)
7745 IRestL1= MV IRestL1(% Operational nominal current)
7746 IRestL2= MV IRestL2(% Operational nominal current)
7747 IRestL3= MV IRestL3(% Operational nominal current)
7748 Diff3I0= MV Diff3I0 (Differential current 3I0)
7880 Ic L1 = MV Measured value charging current L1
7881 Ic L2 = MV Measured value charging current L2
7882 Ic L3 = MV Measured value charging current L3
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Siemens siprotec 7SD5 Specifications

General

Rated Frequency	50/60 Hz
Current Input	1 A / 5 A
Display	LCD
Voltage Supply	24-250 V DC / 100-240 V AC
Communication Interfaces	Ethernet, RS485, USB
Protocols	IEC 61850, DNP3, Modbus
Protection Functions	Overcurrent, Distance
Mounting	Panel mounting
Operating Temperature	-25°C to +70°C

Summary

Preface

Purpose of this Manual

Describes the content and structure of the manual for the 7SD5 device.

Target Audience

Identifies the intended readers for this manual, including engineers and technicians.

Instructions and Warnings

Explains the meaning of DANGER, WARNING, CAUTION, and NOTE indicators used in the manual for safety.

QUALIFIED PERSONNEL

Defines the prerequisites and qualifications required for personnel working with the device.

Typographic and Graphical Conventions

Explains the use of fonts, symbols, and graphical conventions within the manual.

Introduction

Overall Operation

Describes the device's microcomputer system, analog inputs, and basic structure.

Application Scope

Details the device's capabilities in protecting overhead lines and cables with multi-end infeeds.

Characteristics

Outlines general features and specific characteristics of differential and distance protection functions.

Functions

General

Provides general information on device settings, system data, and interaction with protection functions.

Differential Protection

Explains the principle of differential protection, including its application for lines and busbars.

Distance Protection

Details the distance protection function, including fault detection, impedance calculation, and characteristics.

Automatic Reclosure Function (optional)

Describes the automatic reclosure functionality, its operation, and configuration.

Monitoring Functions

Covers hardware and software monitoring, including measurement supervision and malfunction responses.

Function Control and Circuit Breaker Test

Explains device control, circuit breaker position detection, and testing procedures.

Ancillary Functions

Details additional functions such as commissioning tools, message processing, and fault record storage.

Mounting and Commissioning

Mounting and Connections

Provides guidance on device installation, including prerequisites and connection examples for current and voltage transformers.

Checking Connections

Details procedures for checking serial interfaces, protection data communication, and system interfaces.

Commissioning

Covers essential commissioning steps, including test modes, time synchronization, and system interface checks.

Final Preparation of the Device

Describes final checks and settings required before the device is ready for operation.

Technical Data

General

Presents general technical specifications for current inputs, auxiliary voltage, and binary inputs/outputs.

Differential Protection

Lists technical data for differential protection, including pickup values and tripping times.

Distance Protection (optional)

Provides technical data for distance protection, covering earth impedance, phase preferences, and fault detection.

Automatic Reclosure Function (optional)

Details technical data for automatic reclosure, including number of reclosures, control modes, and adaptive dead times.

Synchronism and Voltage Check (optional)

Provides technical data for synchronism and voltage check functions, including operating modes and voltage thresholds.

Undervoltage and Overvoltage Protection (optional)

Lists technical data for undervoltage and overvoltage protection stages for phase, sequence systems.

Frequency Protection (optional)

Presents technical data for frequency protection, including stages, pickup values, and operating ranges.

Fault Locator

Provides technical data for the fault locator function, including start modes and output options.

Circuit Breaker Failure Protection

Details technical data for circuit breaker failure protection, including current flow monitoring and delay times.

Thermal Overload Protection

Lists technical data for thermal overload protection, including setting ranges and tripping characteristics.

Monitoring Function

Provides technical data for monitoring functions, covering hardware, software, and measurement circuit checks.

User Defined Functions (CFC)

Lists technical data for user-defined functions, including function modules and task level assignments.

Dimensions

Provides mechanical dimensions for panel flush, cubicle, and surface mounting.

Appendix

Ordering Information and Accessories

Contains information for ordering devices and accessories, including order codes and descriptions.

Terminal Assignments

Details terminal assignments for panel flush, cubicle, and surface mounting for various device types.

Connection Examples

Provides connection examples for current transformers, voltage transformers, and pilot wires.

Default Settings

Lists default settings for LEDs, binary inputs, binary outputs, and function keys.

Functional Scope

Details the functional scope of the device, including protection and ancillary functions.

Settings

Provides a comprehensive table of all configurable parameters, their setting options, and default values.

Information List

Lists all device information, including status signals, fault indications, and measurement values.