Circuit Breaker Control - GE MiCOM P40 Agile Technical Manual

P543i/P545i
7

CIRCUIT BREAKER CONTROL

Although some circuit breakers do not provide auxiliary contacts, most provide auxiliary contacts to reflect the
state of the circuit breaker. These are:
CBs with 52A contacts (where the auxiliary contact follows the state of the CB)
●
CBs with 52B contacts (where the auxiliary contact is in the opposite state from the state of the CB)
●
CBs with both 52A and 52B contacts
●
Circuit Breaker control is only possible if the circuit breaker in question provides auxiliary contacts. The CB Status
Input cell in the CB CONTROL column must be set to the type of circuit breaker. If no CB auxiliary contacts are
available then this cell should be set to None, and no CB control will be possible.
For local control, the CB control by cell should be set accordingly.
The output contact can be set to operate following a time delay defined by the setting Man Close Delay. One
reason for this delay is to give personnel time to safely move away from the circuit breaker following a CB close
command.
The control close cycle can be cancelled at any time before the output contact operates by any appropriate trip
signal, or by activating the Reset Close Dly DDB signal.
The length of the trip and close control pulses can be set via the Trip Pulse Time and Close Pulse Time settings
respectively. These should be set long enough to ensure the breaker has completed its open or close cycle before
the pulse has elapsed.
If an attempt to close the breaker is being made, and a protection trip signal is generated, the protection trip
command overrides the close command.
The Reset Lockout by setting is used to enable or disable the resetting of lockout automatically from a manual
close after the time set by Man Close RstDly.
If the CB fails to respond to the control command (indicated by no change in the state of CB Status inputs) an
alarm is generated after the relevant trip or close pulses have expired. These alarms can be viewed on the LCD
display, remotely, or can be assigned to output contacts using the programmable scheme logic (PSL).
Note:
The CB Healthy Time and Sys Check time set under this menu section are applicable to manual circuit breaker operations
only. These settings are duplicated in the AUTORECLOSE menu for autoreclose applications.
The Lockout Reset and Reset Lockout by settings are applicable to CB Lockouts associated with manual circuit
breaker closure, CB Condition monitoring (Number of circuit breaker operations, for example) and autoreclose
lockouts.
The device includes the following options for control of a single circuit breaker:
The IED menu (local control)
●
The Hotkeys (local control)
●
● The function keys (local control)
The opto-inputs (local control)
●
SCADA communication (remote control)
●
7.1 CB CONTROL USING THE IED MENU
You can control manual trips and closes with the CB Trip/Close command in the SYSTEM DATA column. This can be
set to No Operation, Trip, or Close accordingly.
P54x1i-TM-EN-1
Chapter 17 - Monitoring and Control
445