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IB02602004E
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Instructional Literature
Effective: May 2008
Page
155
Instructions for the FP-6000 Protective Relay
If the Zone In setpoint is set to “Phase” and the fault direction is
in the Zone Interlock Trip direction, then any phase current above
the IOC pickup or
1.5 times
the TOC pickup will cause an
immediate trip in the absence of an active zone-in signal. Ground
or residual current IOC or TOC will not cause an immediate trip.
The 1.5 time multiplier is used so that a low level current
overload does not cause an immediate trip. If the zone-in signal
is active then the programmed delay time is used.
If the Zone In setpoint is set to “Ground” and the fault direction
is in the Zone Interlock Trip direction, then any ground or residual
current above the IOC pickup or the TOC pickup will cause an
immediate trip in the absence of an active zone-in signal. Phase
current IOC or TOC will not cause an immediate trip. If the zone-
in signal is active then the programmed delay time is used.
In the case that the breaker that is taking action fails to open the
circuit, the zone-out signal is removed in one of two ways:
1. If the breaker fail function is active then the zone out signal is
immediately removed. See Section 5 - Programming and
Section 8.9 - Breaker-Oriented Functions.
2. If the protective relay has operated but the current is still
sensed, the zone-out signal is removed 10 cycles after the
operation.
8.6 Voltage Functions and Protection
8.6.1 Negative Sequence Voltage Protection (47)
The FP-6000 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 41.
Table 41. Negative Sequence Voltage Protection.
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, a Delay setting and
the main voltage elements have an additional setting - phase.
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
. 27M and 59M pickups and trips
are controlled by their phase setting.
The settings for the voltage protection functions are shown in
Table 42.
PARAMETER
RANGE
STEP
47-1 VUB
Threshold
1 to 100 V,
Disabled
1 V
47-1 VUB %
Unbalance
2% to 40%
1%
47-1 VUB
Delay
0 to 9999 Cycles
1 Cycle
47-2 VUB
Threshold
1 to 100 V,
Disabled
1 V
47-2 VUB %
Unbalance
2% to 40%
1%
47-2 VUB
Delay
0 to 9999 Cycles
1 Cycle