Bender NGRM700 User Manual

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NGRM7xx_D00292_07_M_XXEN/02.2022
7.9.4 Phase monitor (menu 6.4)
When phase-voltage monitoring is used, the faulted phase can be determined in the
event of a ground fault.
Tab. 7.5: Phase monitor (menu 6.4)
7.9.5 Response values (menu 6.5)
Behaviour of the trip relay in the event of a ground fault
Set whether a ground fault (response value violation U
NGR
and/or I
NGR
) should switch
the trip relay or not. Set the filter type for NGR current and voltage ("total RMS", "funda-
mental", or "harmonics") that leads to a violation of the response value at "Trip signal".
a) Ground-fault trip "on"
When a ground fault is detected
 the ground-fault relay (connections 11, 12, 14) switches immediately (40 ms).
 the trip relay (connections 31, 32, 34) switches after t
GF trip
has elapsed.
b) Ground-fault trip "off"
When a ground fault is detected
 the ground-fault relay (connections 11, 12, 14) switches immediately (40 ms).
 the trip relay (connections 31, 32, 34) does not switch, t
GF trip
is ignored.
Resistor faults
Resistor faults (response value violation R
NGR
) are independent of the "GR trip" settings:
The NGR-fault relay (connections 21, 22, 24) switches within the response time of ap-
prox. 7.5 s. The trip relay (connections 31, 32, 34) switches with a delay according to
the t
NGR trip
setting.
Menu Parameter Setting range Explanatory notes
6.4.1 Phase monitor on, off
on: enable function
off: disable function (despite wiring, the
faulted phase is not signalled)
6.4.2 PT primary 1…10,000
Ratio of the potential transformer on
the primary side
6.4.3 PT secondary 1…10,000
Ratio of the potential transformer on
the secondary side
When using a coupling device CD14400 or CD25000, the menu item
"Ground-fault trip = off" is not available.

Bender NGRM700 Specifications

General

Brand	Bender
Model	NGRM700
Category	Measuring Instruments
Language	English