Jul 2, 2012 22:28
12 yrs ago
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English term
Trip Seal-In
English to Polish
Tech/Engineering
Electronics / Elect Eng
transformers and relays
Introduction
Following functions exist within the logic group: Trip Seal-In, Minimum Open Command
Activation Time, Minimum Close Command Activation Time, Breaker Open and Close Failure
Time, Manual Closing through Recloser, Manual Close Synchrocheck Supervision and Pickup
Reports.
Trip Seal-In
To enable the seal-in function the setting Trip Seal-In must be set to YES. Under these
circumstances, once an opening or trip command and the corresponding breaker operate
command has been generated; the command is active until open breaker is detected through
the auxiliary contact.
If setting Trip Seal-In is set to NO, the trip command resets when protection measuring
elements or logic signals that generated trip activation reset.
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Following functions exist within the logic group: Trip Seal-In, Minimum Open Command
Activation Time, Minimum Close Command Activation Time, Breaker Open and Close Failure
Time, Manual Closing through Recloser, Manual Close Synchrocheck Supervision and Pickup
Reports.
Trip Seal-In
To enable the seal-in function the setting Trip Seal-In must be set to YES. Under these
circumstances, once an opening or trip command and the corresponding breaker operate
command has been generated; the command is active until open breaker is detected through
the auxiliary contact.
If setting Trip Seal-In is set to NO, the trip command resets when protection measuring
elements or logic signals that generated trip activation reset.
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Dziękuję!
References
Trip Seal-in |
Jerzy Matwiejczuk
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Reference comments
20 mins
Reference:
Trip Seal-in
The trip circuit current is monitored by providing a current threshold detector in series with each Form-A contact. The monitor will set a flag at approximately 15-20 mA. The name of the FlexLogic™ operand set by the monitor consists of the output relay designation, followed by the name of the flag; e.g. Output H1 Current On. In most breaker control circuits, the trip coil is connected in series with a breaker auxiliary contact used to interrupt current flow after the breaker has tripped, to prevent damage to the less robust initiating contact. This can be done by monitoring an auxiliary contact on the breaker which opens when the breaker has tripped, but this scheme is subject to incorrect operation caused by differences in timing between breaker auxiliary contact change-of-state and interruption of current in the trip circuit. The most dependable protection of the initiating contact is provided by directly measuring current in the tripping circuit, and using this parameter to control resetting of the initiating relay. This scheme is often called "trip seal-in".
http://www.geindustrial.com/pm/tours/ur_tour/l90/i_o.htm
http://www.geindustrial.com/pm/tours/ur_tour/l90/i_o.htm
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