IL17569
Page 8-10
Effective June, 2001
8.7 Wye versus Delta Voltage Transformers
The FP-5000 requires setting of system configuration parameters
for proper operation of all system functions (see programming
Section 5.1). All voltage settings are based on the VT input
configuration. Both wye (
φ
- G) and Delta (
φ
-
φ
) voltage connections
are supported. For wye-connected systems, the voltage settings are
based on phase-to-ground voltages. Voltage settings are based on
phase-to-phase voltages for delta-connected systems.
8.8 Frequency Protection (81)
The FP-5000 includes protective functions for detecting
under-frequency and over-frequency conditions. Two elements
are provided for each function so alarm and trip levels can be set
independently. Each of the frequency protection functions has
a Threshold and a Delay setting. The time delay is provided for
coordination with other devices. If the voltage on phase A drops
below 10 volts, the under-frequency and over-frequency functions
are disabled.
An over-frequency pickup occurs when the measured frequency
exceeds the over-frequency Threshold setting. The over-frequency
trip is set when the over-frequency condition exists for the delay
time specified. The over-frequency pickup and trip are reset when
the frequency drops below the over-frequency Threshold setting.
An under-frequency pickup occurs when the measured frequency
drops below the under-frequency Threshold setting. The under-
frequency trip is set when the under-frequency condition exists for
the delay time specified. The under-frequency pickup and trip is
reset when the frequency raises above the under-frequency
Threshold setting.
The settings for the over-frequency and under-frequency functions
are shown in Section 5, Programming and are repeated in Table 8.5.
Table 8.5 Frequency Protection Settings
Parameter
Range
Step
81U-1 Under
45 to 65 Hz,
0.1 Hz
Frequency
Disabled
Threshold
81U-1 Under
0 to 9999 Cycles
1 Cycle
Frequency
Time Delay
81O-1 Over
45 to 65 Hz,
0.1 Hz
Frequency
Disabled
Threshold
81O-1 Over
0 to 9999 Cycles
1 Cycle
Frequency
Time Delay
81U-2 Under
45 to 65 Hz,
0.1 Hz
Frequency
Disabled
Threshold
81U-2 Under
0 to 9999 Cycles
1 Cycle
Frequency
Time Delay
81O-2 Over
45 to 65 Hz,
0.1 Hz
Frequency
Disabled
Threshold
81O-2 Over
0 to 9999 Cycles
1 Cycle
Frequency
Time Delay
Содержание 66D2041G01
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