Table 4-25 summarizes the operating settings for Auxiliary Overvoltage.
Table 4-25. Operating Settings for Auxiliary Overvoltage
Setting
Range
Increment
Unit of Measure
Default
Pickup
0 = Disabled
1 to 150
0.1 for 0 to 99.9
1.0 for 100 to 150
Secondary Volts
0
50 to 999 milliseconds
1
Milliseconds
0.1 for 1.0 to 9.9
Seconds
1 to 600 seconds
1.0 for 10 to 600
Seconds
3 to 36,000 cycles (60 Hz)
Time Delay
2.5 to 30,000 cycles (50 Hz)
Cycles
50 ms
Time delays less than 10 cycles can be entered to the nearest 0.1 cycles from the front panel HMI. All
time delays can be entered to the nearest 0.01 cycles from the ASCII command interface. Time delays
entered in cycles are converted to milliseconds or seconds. Increment precision after conversion is limited
to that appropriate for each of those units of measure.
Example 1.
Make the following changes to the 59X element. Refer to Figure 4-42.
Pickup
: 75 secondary volts
Time
: 50 ms
Retrieving Auxiliary Overvoltage Status from the Relay
The status of each logic variable can be determined through the ASCII command interface using the RG-
STAT (report general-status) command. See Section 6,
Reporting and Alarm Functions, General Status
Reporting
, for more information. The status can also be determined using BESTCOMS
Metering
screen.
47 - Negative-Sequence Overvoltage Protection
Figure 4-43 illustrates the inputs and outputs of the negative-sequence overvoltage element. Element
operation is described in the following paragraphs. Negative-sequence overvoltage protection is not
available if VTP connection is single-phase.
D2881-29
08-12-04
Figure 4-43. Negative-Sequence Overvoltage Logic Block
The negative-sequence overvoltage element has two outputs:
47PU
(pickup) and
47T
(trip). When the
monitored negative-sequence voltage increases above the pickup setting, the pickup output becomes
TRUE and the element starts timing toward a trip. The trip output becomes TRUE when the element timer
times out.
The
BLK
(block) input is used to disable protection. A BESTlogic expression defines how the
BLK
input
functions. When this expression is TRUE, the element is disabled by forcing the outputs to logic 0 and
resetting the timer. This feature functions in a similar way to the torque control contact of an
electromechanical relay.
The 47 element is enabled or disabled by the
Mode
input. Two modes are available. Selecting Mode 0
disables protection. Mode 1 enables the 47 element. More information about logic mode selections is
provided in the
BESTlogic Settings for Negative-Sequence Overvoltage
paragraphs.
4-48
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Summary of Contents for BE1-CDS240
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