Negative Sequence Current; Voltage Elements - GE F650 Instruction Manual

5.4 PROTECTION ELEMENTS
The Negative sequence menu incorporates the Negative sequence time overcurrent (46P) element:
5.4.7.1 NEGATIVE SEQUENCE OVERCURRENT ELEMENT (46P)
Negative Sequence TOC is an overcurrent protection element that uses the fundamental phasor of the negative sequence
current as input magnitude, calculated from the phase currents. This element can be used for detecting load unbalance in
the system, and for open phase conditions (fallen or broken conductor). The trip can be time delayed by a curve selectable
by setting. The reset can be instantaneous or linear.
Table 5–63: NEGATIVE SEQUENCE TOC ELEMENT SETTINGS
SETPOINT > PROTECTION ELEMENTS > NEGATIVE SEQUENCE CURRENT > NEGATIVE SEQUENCE TOC >
NEGATIVE SEQUENCE TOC 1> NEGATIVE SEQUENCE TOC 2 > NEGATIVE SEQUENCE TOC 3
SETTING DESCRIPTION
Function permission
Pickup level
Curve shape
Time Dial
Reset type
Snapshot Event generation
The snapshot event setting enables or disables the snapshot event generation for this element.
5
The F650 incorporates the following voltage elements:
• Phase undervoltage (27P)
• Phase overvoltage (59P)
• Neutral overvoltage (59NH/59NL)
• Negative sequence overvoltage (47)
• Auxiliary overvoltage (59X)
• Auxiliary undervoltage (27X)
These protection elements can be used in multiple applications, such as:
Undervoltage protection: for induction motor load types, where a voltage dip can cause an increase of the consumed
current. Element 27P (phase undervoltage) can be used to issue a trip or an alarm.
Transfer Schemes: in the event of an undervoltage condition, we can use the 27P element (phase undervoltage) to send a
signal that will transfer load to another power source.
Undervoltage elements can be set to operate with definite time or with an inverse time curve. If the element is set as
definite time, it will operate when voltage remains under the set value during the set period of time. This period can be set
from 0s to 900.00 s in steps of 10ms.
5-70
NAME DEFAULT VALUE
Function DISABLED
Pickup Level 1.00
Curve IEEE Ext Inv
TD Multiplier 1.00
Reset INSTANTANEOUS
Snapshot Events ENABLED
F650 Digital Bay Controller

5.4.7 NEGATIVE SEQUENCE CURRENT

STEP RANGE
N/A [DISABLED – ENABLED]
0.01 A [0.05 : 160.00]
N/A [See list of curves]
0.01 s [0.00 : 900.00]
N/A [INSTANTANEOUS – LINEAR]
N/A [DISABLED – ENABLED]

5.4.8 VOLTAGE ELEMENTS

5 SETTINGS
GEK-106310AB