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Siemens siprotec 7SD5 User Manual

Siemens siprotec 7SD5
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Page #315 background image
2.16 Synchronism and Voltage Check (optional)
315
7SD5 Manual
C53000-G1176-C169-1
Figure 2-131 Synchronism check across a transformer
The synchronism check function in the 7SD5 usually operates in conjunction with the
integrated automatic reclose, manual close, and the control functions of the relay. It is
also possible to employ an external automatic reclosing system. In such a case, signal
exchange between the devices is accomplished via binary inputs and outputs.
When closing via the integrated control function, the configured interlocking conditions
may have to be verified before checking the conditions for synchronism. After the syn-
chronism check grants the release, the interlocking conditions are not checked a
second time.
Furthermore, switching is possible with synchronous or asynchronous system condi-
tions or both. Synchronous switching means that the closing command is issued as
soon as the critical values (voltage magnitude difference Max. Volt. Diff, angle
difference Max. Angle Diff, and frequency difference Max. Freq. Diff) lie
within the set tolerances. For switching with asynchronous system conditions, the
device calculates the correct timing of the closing command from the angle difference
Max. Angle Diff and the frequency difference Max. Freq. Diff such that the
voltages on the busbar and the feeder circuit have exactly the same phase relationship
at the instant that the circuit breaker primary contacts close. For this purpose the
device must be informed on the operating time of the circuit breaker for closing. Differ-
ent frequency limit thresholds apply to switching under synchronism and asynchro-
nous conditions. If closing is permitted exclusively under synchronous system condi-
tions, the frequency difference limit for this condition can be set. If closing is permitted
under synchronous as well as under asynchronous system conditions, a frequency dif-
ference below 0.01 Hz is treated as a synchronous condition, a higher frequency dif-
ference value can then be set for closing under asynchronous system conditions.
The synchro check function only operates when it is requested to do so. Various pos-
sibilities exist for this purpose:
Measuring request from the internal automatic reclosure device. If the internal au-
tomatic reclosing function is set accordingly (one or more reclosing attempts set to
synchronism check, see also Section 2.15.2), the measuring request is accom-
plished internally. The release conditions for automatic reclosing apply.
Measuring request from an external automatic reclosure device. The measuring
request must be activated via the binary input „>Sync. Start AR“ (No. 2906).
The release conditions for automatic reclosing apply.
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Siemens siprotec 7SD5 Specifications

General IconGeneral
Rated Frequency50/60 Hz
Current Input1 A / 5 A
DisplayLCD
Voltage Supply24-250 V DC / 100-240 V AC
Communication InterfacesEthernet, RS485, USB
ProtocolsIEC 61850, DNP3, Modbus
Protection FunctionsOvercurrent, Distance
MountingPanel 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.

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