Three-Phase Breaker

 Single Pole Operation

Choice

Select Yes or No. If Yes is selected, all three breaker phases will be operated independently of each other. Therefore, three input control signals will be required.

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 3-Phase View or Single Line View

Graphics Display 2

Choice

Select Low Voltage Display or High Voltage Display

Display Power Flow

Choice

Select Yes or No. If Yes is selected, the 3-phase real and reactive power flowing through the breaker will be monitored and displayed

Breaker Name

INTEGER

Variable

Enter a name to identify the breaker. This name will also act as the breaker input control signal

Breaker Phase Name

INTEGER

Variable

Enter a name for the input control signal for the specified phase. This input is only used when Single Pole Operation | Yes is selected

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]

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 (X)

REAL

Variable

Enter the time delay between the ON (closed) signal and actual closing of the specified breaker phase. After this time delay, the specified breaker phase will close on to the pre-insertion resistance [s]

Time Delay for Bypassing Pre-Ins. (X)

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 specified breaker phase [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 specified breaker phase current [kA]

Name for Calculated Zero Seq. Current (kA)

REAL

Output

Name for the calculated zero-sequence current [kA]

Name for Breaker Status

INTEGER

Output

Name for the open or closed status signal for the specified breaker phase

Name for Active Power

REAL

Output

Name for the active power flowing through the breaker [MW]

Name for Reactive Power

REAL

Output

Name for the reactive power flowing through the breaker [MVAr]

Name for Voltage Across Breakers

REAL

Output

Name for the measured voltage signal across the breaker [kV].  

NOTE:  As this is a three-phase breaker, this output signal will be a 3-element array.

 Breaker Phase Status

Choice

Select Open or Closed to set the initial animation state (red or green) of the specified breaker phase

Active Power

REAL

Variable

Enter the active power value for display at time t = 0.0

Reactive Power

REAL

Variable

Enter the reactive power value for display at time t = 0.0