Page 8-9
IL17569
Effective June, 2001
8.6 Voltage Functions and Protection
8.6.1 Negative Sequence Voltage Protection (47)
The FP-5000 provides monitoring and protection based on the
percent of voltage unbalance or negative sequence voltage. The
presence of negative sequence voltage identifies either a phase
unbalance or reverse phase rotation condition. The positive and
negative sequence voltages are calculated from the three phase
voltages. The % unbalance is the ratio of negative sequence
voltage to positive sequence voltage (%Unbalance = V
2
/V
1
). A
voltage unbalance pickup occurs when V
2
/V
1
exceeds the VUB %
Unbalance setting and the V
1
or the V
2
magnitude exceeds the VUB
Threshold setting. The Voltage Unbalance trip is set when the
pickup condition exists for the delay time specified. The voltage
unbalance pickup and trip is reset when the positive sequence
voltage drops below the VUB Threshold setting or V
2
/V
1
drops below
the VUB % Unbalance setting minus 1%.
The settings associated with voltage unbalance or negative
sequence voltage protection are listed in Table 8.3 below.
Table 8.3 Negative Sequence Voltage Protection
Parameter
Range
Step
47-1 VUB
1 to 100V,
1 V
Threshold
Disabled
47-1 VUB %
4% to 40%
1%
Unbalance
47-1 VUB
0 to 9999 Cycles
1 Cycle
Delay
47-2 VUB
1 to 100V,
1 V
Threshold
Disabled
47-2 VUB %
4% to 40%
1%
Unbalance
47-2 VUB
0 to 9999 Cycles
1 Cycle
Delay
8.6.2 Undervoltage (27) and Overvoltage (59) Protection
Separate undervoltage and overvoltage protective elements are
provided for the main voltage inputs (V
A
, V
B
, V
C
) and the auxiliary
voltage input (V
X
). Two elements are provided for each function so
alarm and trip levels can be set independently. Each of the voltage
protection functions has a Threshold and a Delay setting. The
optional time delay is provided for coordination with other devices.
An overvoltage pickup occurs when the measured voltage exceeds
the OV Threshold setting. The overvoltage trip flag is set when the
voltage exceeds the threshold setting for the delay time specified.
The overvoltage pickup and trip is reset when the voltage drops
below 98% of the OV Threshold setting.
An undervoltage pickup occurs when the measured voltage drops
below the UV Threshold setting. The undervoltage trip is set when
the voltage stays below the threshold setting for the delay time
specified. The undervoltage pickup and trip is reset when the
voltage raises above 102% of the UV Threshold setting.
The Main OV and UV Pickup and Delay settings apply to all three
phase voltages, V
A
, V
B
and V
C
.
The settings for the voltage protection functions are shown in
Table 8.4.
Table 8.4 Voltage Protection Settings
Parameter
Range
Step
59-M1 Main
10 to 150V,
1V
Overvoltage
Disabled
Threshold
59-M1 Main
0 to 9999 Cycles
1 Cycle
Overvoltage
Delay
59-M2 Main
10 to 150V, Disabled
1V
Overvoltage
Threshold
59-M2 Main
0 to 9999 Cycles
1 Cycle
Overvoltage
Delay
27-M1 Main
10 to 150V,
1 V
Undervoltage
Disabled
Threshold
27-M1 Main
0 to 9999 Cycles
1 Cycle
Undervoltage
Delay
27-M2 Main
10 to 150V,
1 V
Undervoltage
Disabled
Threshold
27-M2 Main
0 to 9999 Cycles
1 Cycle
Undervoltage
Delay
59-A1 Auxiliary
10 to 250V,
1V
Overvoltage
Disabled
Threshold
59-A1 Auxiliary
0 to 9999 Cycles
1 Cycle
Overvoltage
Delay
59-A2 Auxiliary
10 to 250V,
1V
Overvoltage
Disabled
Threshold
59-A2 Auxiliary
0 to 9999 Cycles
1 Cycle
Overvoltage
Delay
27-A1 Auxiliary
10 to 250V,
1 V
Undervoltage
Disabled
Threshold
27-A1 Auxiliary
0 to 9999 Cycles
1 Cycle
Undervoltage
Delay
27-A2 Auxiliary
10 to 250V,
1 V
Undervoltage
Disabled
Threshold
27-A2 Auxiliary
0 to 9999 Cycles
1 Cycle
Undervoltage
Delay
Содержание 66D2041G01
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