5-96
F650 DIGITAL BAY CONTROLLER
GEK-106310-AF
5.4 PROTECTION ELEMENTS
CHAPTER 5: SETPOINTS
Status
Statuses defined for this Function are as follows:
32N1 (2, 3) HIGH (LOW) BLOCK
:Writing status, operates by level. When this status is activated externally (via PLC), the
wattmetric ground fault element is blocked.
The activation produces the event:
32N1 (2, 3) HIGH (LOW) BLOCK ON
.
Deactivation produces the event:
32N1 (2, 3) HIGH (LOW) BLOCK OFF
.
32N1 (2, 3) HIGH (LOW) OC PKP
: The activation of this status indicates that the current value has exceeded the
threshold indicated and pickup delay has expired. Events generated by this element
are:
32N1 (2, 3) HIGH (LOW) OC PKP ON
32N1 (2, 3) HIGH (LOW) OC PKP OFF
32N1 (2, 3) HIGH (LOW) PKP
:Activation of this status indicates that the current, voltage and power value has exceeded
the threshold indicated and power pickup delay has expired.
Events generated by this element are:
32N1 (2, 3) HIGH (LOW) PKP ON
32N1 (2, 3) HIGH (LOW) PKP OFF
32N1 (2, 3) HIGH (LOW) OP
: This is activated when the element is activated. Events generated by this element are:
32N1 (2, 3) HIGH (LOW) OP ON
32N1 (2, 3) HIGH (LOW) OP OFF
5.4.10 Frequency elements
5.4.10.1 Underfrequency element (81U)
The steady-state frequency of a power system is a certain indicator of the existing balance between the generated power
and the load. Whenever this balance is disrupted through the loss of an important generating unit, the effect is a reduction
in frequency. A reliable method to quickly restore the balance between load and generation is to automatically disconnect
the selected loads, based on the actual system frequency. This technique called “load-shedding” maintains system
integrity and minimizes widespread outages.
The 81U element is an underfrequency control element. The pickup setting can be selected from 20.00 to 65.00 Hz. The
element reset time delayed is selectable between 0.00 and 900 seconds, and for the element to operate it is necessary
that the voltage value is over the value set for minimum voltage threshold. This way undesired trips are prevented when
the signal for metering the frequency is not available or has a very low value.
Underfrequency elements (81U) can be configured by using Enervista 650 Setup at
Setpoint>Protection
Elements>Setting Group X
Table 5-63: 81U element settings
Setpoint > Control Elements > Underfrequency
UNDERFREQUENCY 1 > UNDERFREQUENCY 2 > UNDERFREQUENCY 3 >UNDERFREQUENCY 4>UNDERFREQUENCY
5>UNDEFREQUENCY 6 **
setting Description
Name
Default Value
Step
Range
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
Pickup level
Pickup Level
49.50
0.01 Hz
[20.00 : 65.00]
Trip time
Trip Delay
0.00
0.01 s
[0.00 : 900.00]
Summary of Contents for F650
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