Adorama.com INT

2

money

Tuesday, 12 January 2016

7VK61 breaker management relay for Various Protection Applications


Protection functions

• Single and/or three-pole auto-reclosure
• Synchro-check with live/dead line/bus measurement

• Closing under asynchronous conditions (consideration of CB operating time)
• Circuit-breaker failure protection with two stages (single and three-pole with/without current)
• End-fault protection
• Pole-discrepancy protection
• Overvoltage/undervoltage protection

Control function

• Commands for control of CB and isolators

Application

The 7VK61 provides highly flexible breaker management. It applies to singlebreaker, ring-bus, and 1½ breaker installations.
The auto-reclosure, synchronismcheck, breaker failure protection and voltage protection functions can be used separately or combined. Therefore the current and voltage transformer connection
can be selected according to the required application.
The auto-reclosure function closes the circuit-breaker after this circuit-breaker has tripped due to a fault. The checksynchronism function ensures that the two circuits being reconnected by closing the circuit-breaker are within a defined safe operating state before the CLOSE command is issued.
The numerical 7VK61 relay provides rapid backup fault clearance in case the circuit-breaker nearest to the fault fails to respond to a TRIP command.
 It is suitable for power systems of all voltage levels with single and/or three-pole circuit breaker operation. The initiation signal can be issued from any protection or supervision equipment.
Information from the circuit-breaker auxiliary contact is only required for the breaker failure protection during faults which produce little or no fault current fl ow, for instance due to a trip
from the power transformer Buchholz protection.

No comments:

omar

Libertex [CPS] WW

Sponcer

button

tele

Lycamobile's SIM Only Plan For $9.90 - Limited Offer - 66% off on SIM+Plan. Grab your Prepaid SIM Deal now!

The necessary response to substation problems

  When it comes to power distribution, substations are the backbone of our grid. Keeping them in optimal condition is essential to ensure re...