Basler BE1-CDS240, Instruction Manual

Page: 129 / 580

Table 4-27 summarizes operating settings for Negative-Sequence Overvoltage.
Table 4-27. Operating Settings for Negative-Sequence Overvoltage
Setting Range Increment Unit of Measure Default
Pickup
0 = Disabled
10 to 300
0.1 for 0 to 99.9
1.0 for 100 to 300
Secondary Volts 0
50 to 999 milliseconds 1 Milliseconds
0.1 for 0.1 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 operational settings to the 47 element. Refer to Figure 4-45.
Pickup: 50 Vpn secondary volts
Time: 50 ms
Retrieving Negative-Sequence 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.
FREQUENCY PROTECTION
81 - Over/Underfrequency Protection
BE1-CDS240 frequency protection consists of six independent elements that can be programmed for
underfrequency or overfrequency protection. Each element has an adjustable frequency setpoint and time
delay. The 81 elements share a common undervoltage inhibit setting. Power system frequency is
measured on the A phase voltage input for four-wire or single-phase connections or the AB voltage input
when in three-wire mode. Power system frequency is measured on the optional auxiliary voltage input as
well. When the applied voltage is greater than 10 volts, the BE1-CDS240 measures the frequency.
Frequency element designations are 81, 181, 281, 381, 481, and 581. Each of the six elements has
identical inputs, outputs, and setting provisions. Figure 4-46 illustrates the inputs and output of a
frequency element. A trip output (x81T) is provided on each element. The trip output becomes TRUE
when the monitored frequency decreases below (81U) or increases above (81O) the pickup setting and
the element timer times out.
Mode
BLK x81T
OVER/UNDER
FREQUENCY
(x81)
D2849-36
09-29-03
0-Disable
1-Phase VT
Input
Figure 4-46. Over/Underfrequency Protection Logic Block
9365200990 Rev F BE1-CDS240 Protection and Control 4-51