Voltage Elements - GE UR F35 Series Instruction Manual

5.6 GROUPED ELEMENTS
The positive-sequence restraint must be considered when testing for pickup accuracy and response time (multiple of
pickup). The operating quantity depends on the way the test currents are injected into the relay (single-phase injection:
⋅
I 0.2917 I
=
op injected
a) MAIN MENU

PATH: SETTINGS GROUPED ELEMENTS
 VOLTAGE ELEMENTS
5

These protection elements can be used for a variety of applications such as:
• Undervoltage Protection: For voltage sensitive loads, such as induction motors, a drop in voltage increases the
drawn current which may cause dangerous overheating in the motor. The undervoltage protection feature can be used
5-152
; three-phase injection, opposite rotation:
Figure 5–63: NEGATIVE SEQUENCE IOC1 SCHEME LOGIC

SETTING GROUP 1(6)
 PHASE
 UNDERVOLTAGE1
 PHASE
MESSAGE
 UNDERVOLTAGE2
 NEUTRAL OV1
MESSAGE

 NEUTRAL OV2
MESSAGE

 NEUTRAL OV3
MESSAGE

 AUXILIARY UV1
MESSAGE

 AUXILIARY UV2
MESSAGE

 AUXILIARY UV3
MESSAGE

 AUXILIARY OV1
MESSAGE

 AUXILIARY OV2
MESSAGE

 AUXILIARY OV3
MESSAGE

F35 Multiple Feeder Protection System
I I ).
=
op injected


VOLTAGE ELEMENTS

See page 5–154.
See page 5–154.
See page 5–155.
See page 5–155.
See page 5–155.
See page 5–156.
See page 5–156.
See page 5–156.
See page 5–157.
See page 5–157.
See page 5–157.
5 SETTINGS
5.6.8 VOLTAGE ELEMENTS
GE Multilin