Frequency Protection 81 O/U Of Side 2; Description - Siemens 7SC80 Manual

Functions
2.30 Additional Applications with 6 Voltage Inputs
No. Information
31286 27-1 Ph2A PU CS
31287 27-1 Ph2B PU CS
31288 27-1 Ph2C PU CS
31289 27-2 Ph2A PU
31290 27-2 Ph2B PU
31291 27-2 Ph2C PU
31292 27-2 Ph2A PU CS
31293 27-2 Ph2B PU CS
31294 27-2 Ph2C PU CS
31295 27-1 Ph2A TRIP
31296 27-1 Ph2B TRIP
31297 27-1 Ph2C TRIP
31298 27-2 Ph2A TRIP
31299 27-2 Ph2B TRIP
31300 27-2 Ph2C TRIP
31301 59-1 Ph2A PU
31302 59-1 Ph2B PU
31303 59-1 Ph2C PU
31304 59-1 Ph 2A TRIP
31305 59-1 Ph 2B TRIP
31306 59-1 Ph 2C TRIP
31307 59-2 Ph2A PU
31308 59-2 Ph2B PU
31309 59-2 Ph2C PU
31310 59-2 Ph 2A TRIP
31311 59-2 Ph 2B TRIP
31312 59-2 Ph 2C TRIP
2.30.3

Frequency Protection 81 O/U of Side 2

The frequency protection function detects overfrequencies and underfrequencies in the power system. If the
frequency lies outside the permissible range, appropriate switching actions are initiated.
Applications
•
Underfrequency is caused by an increased real power demand of the power system or faulty operation of
the frequency regulation.
•
Overfrequency is caused, e.g. by load shedding (island network) or malfunction of the frequency regula-
tion.

Description

2.30.3.1
Detection of Frequency of Side 2
The frequency of side 2 is detected preferably from the voltage connected to the terminals marked with
VX/V2A on the housing. If the voltage is lower than the valid voltage value threshold, the calculation uses
other channels.
438
Type of Comments
Informa-
tion
OUT 27-1 Phase 2A PICKUP w/curr. Supervision
OUT 27-1 Phase 2B PICKUP w/curr. Supervision
OUT 27-1 Phase 2C PICKUP w/curr. Supervision
OUT 27-2 Phase 2A Undervoltage pickup
OUT 27-2 Phase 2B Undervoltage pickup
OUT 27-2 Phase 2C Undervoltage pickup
OUT 27-2 Phase 2A PICKUP w/curr. Supervision
OUT 27-2 Phase 2B PICKUP w/curr. Supervision
OUT 27-2 Phase 2C PICKUP w/curr. Supervision
OUT 27-1 Phase 2A Undervoltage TRIP
OUT 27-1 Phase 2B Undervoltage TRIP
OUT 27-1 Phase 2C Undervoltage TRIP
OUT 27-2 Phase 2A Undervoltage TRIP
OUT 27-2 Phase 2B Undervoltage TRIP
OUT 27-2 Phase 2C Undervoltage TRIP
OUT 59-1 Phase 2A picked up
OUT 59-1 Phase 2B picked up
OUT 59-1 Phase 2C picked up
OUT 59-1 Phase 2A TRIP
OUT 59-1 Phase 2B TRIP
OUT 59-1 Phase 2C TRIP
OUT 59-2 Phase 2A picked up
OUT 59-2 Phase 2B picked up
OUT 59-2 Phase 2C picked up
OUT 59-2 Phase 2A TRIP
OUT 59-2 Phase 2B TRIP
OUT 59-2 Phase 2C TRIP
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017