Single-Phase Breaker

This component simulates of single-phase circuit breaker operation. The ON (closed) and OFF (open) resistance of the breaker must be specified along with its initial state.

This component is controlled through a named input signal (default is BRK), where the breaker logic is:

The breaker control can be configured automatically by using the Timed Breaker Logic component, or the Sequencer components. The breaker may also be controlled manually through the use of on-line controls, or through a more elaborate control scheme.

Input Parameters

Breaker Name	INTEGER	Variable	Enter a name for the breaker input control signal

Open Possible at Any Current?	Choice		Select Yes or No. If No is selected, the breaker will wait for the absolute value of the current to be less than the specified Current Chopping Limit.

Use Pre-Insertion Resistance?	Choice		Select Yes or No. See Pre-Insertion Resistance for more details.

Current Chopping Limit	REAL	Constant	Enter the limit for current chopping [kA]. See Open Possible at any Current? above.

Graphics Display	Choice		Select Low Voltage Display or High Voltage Display

Breaker OPEN Resistance	REAL	Constant	Enter a large value to represent the OFF (open) state of the breaker. This should be in the order of 1.0 x 106 (default) [W]

Breaker CLOSED Resistance	REAL	Constant	Enter a small value to represent the ON (closed) state of the breaker. This should be in the order of 1.0 x 10-3 (default). See Ideal Branch for more details [W]

NOTE: These parameters are enabled only if Use Pre-Insertion Resistance? | Yes is selected. See Pre-Insertion Resistance for more details.

Pre-Insertion Resistance	REAL	Constant	The value of Pre-insertion resistance. This should be smaller than the OFF (open) resistance and larger than the ON (closed) resistance [W]

Time Delay for Closing Breaker	REAL	Variable	Enter the time delay between the ON (closed) signal and actual closing of the breaker. After this time delay, breaker will close on to the pre-insertion resistance [s]

Time Delay for Bypassing Pre-Ins.	REAL	Constant	Enter the time delay between the ON (closed) signal and the bypassing of the pre-insertion resistance. If this time delay is smaller than the Time Delay for Closing Breaker, the pre-insertion resistance will not be inserted before closing the breaker [s]

Post-Insertion Removal	Choice		Select at next current zero or after specified time. This control specifies whether to remove the post insertion resistance at the next zero-crossing of current or following a specified time.

Minimum Time for Post-Ins Removal	REAL	Variable	Specifies the time after which the post insertion resistance is removed [s]. This field is enabled only if Post-Insertion Removal \| Yes is selected.

Name for Breaker Current (kA)	REAL	Output	Name for the breaker current [kA]

Name for Breaker Status	INTEGER	Output	Name for the open or closed status signal for the breaker

Name for Voltage Across Breaker	REAL	Output	Name for the measured voltage signal across the breaker [kV].

Single-Phase Breaker

Description

Input Parameters