Siemens 7SJ85 - Voltage-Comparison Supervision; Overview of Functions; Structure of the Function; Description

Voltage-Comparison Supervision
Overview of Functions
The Voltage-comparison supervision function (ANSI 60):
•
Monitors the voltage-transformer circuits by comparing the voltages from 2 voltage transformers
If failures in the voltage circuits are detected, voltage-related protection functions can be blocked.
•
Requires the connection of 2 voltage measuring points to the voltage interface of the function group
You can take one of the voltages as the reference voltage and then the other becomes the main voltage.
The reference voltage is used for comparison.
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NOTE
The voltage selection for the protection function in the FGs works independent of the status of the
Voltage-comparison supervision function.
Structure of the Function
The Voltage-comparison supervision function can be used in the following function groups:
•
Generator stator
•
Generator side
•
Voltage-current 3-phase (VI 3ph)
•
Transformer side
•
Auto transformer autoside (Auto trf. autoside)
The Voltage-comparison supervision function supports only 1 stage. The stage is preconfigured at the
factory.
[dw_structure_VBP, 1, en_US]
Figure 9-19 Structure/Embedding of the Function
Description
Function Application
The following figure shows an application example.
[dw_VBP application, 1, en_US]
Figure 9-20 Application Example
9.3.8
9.3.8.1
9.3.8.2
9.3.8.3
Supervision Functions
9.3 Supervision of the Secondary System
1266 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017