Bender NGRM700 User manual

1
Quickstart
NGR monitor
Intended use
The NGRM700 is only intended for use in high-resistance earthed sys-
tems. In these systems, the NGRM700 monitors
 the NGR rated current,
 the voltage between the star point of the transformer and earth
(voltage drop across the NGR),
 the condition of the neutral grounding resistor (NGR),
 line-to-line and line-to-earth voltages.
This quick-start guide does not replace the operating manual of the
device. Download: www.bender.de/manuals
Safety instructions
Removing FP200-NGRM
Connection X1
Risk of electrocution due to electric shock!
Touching live parts of the system carries the risk of:
 An electric shock
 Damage to the electrical installation
 Destruction of the device
Before installing and connecting the device, make sure that the installation has
been de-energised. Observe the rules for working on electrical installations.
I1 Pulser IN
I2 Reset IN
I3 Test IN
A—
B—
Ground
M+ Analogue output
Q2 Open Collector: Pulser OUT
Q1 Open Collector: System health
+ Output for supply of external relays (+24 V, max. 100 mA)
DANGER
PH 1
X1 ETH R
OFFON
1
2
X1 ETH R
RJ45: Ethernet
RJ45: Remote
max. 5 m
Switch
I1
I2
I3
A
B
M+
Q2
Q1
+
NGRM700
NGRM700_D00292_00_Q_XXEN/09.2017
EN

2NGRM700_D00292_00_Q_XXEN/09.2017
Dimension diagrams basic enclosure and FP200-NGRM
a
k
j
i
hgf
e
d
cb
l
3
55.50
61.40
63.35
150
125
230
245
205
223.50
211
a
k
j
i
h
g
f
e
d
c
b
l
0.12
2.19
2.42
2.49
5.91
4.92
9.06
9.65
8.07
8.80
8.31
mm in
60.236
a
f
e
d
c
b
a
f
e
d
c
b
mm in
135.5
65.5
35.6
144
72
5.8
5.33
2.58
1.40
5.67
2.38
0.23

3
NGRM700_D00292_00_Q_XXEN/09.2017
Connection ≤ 690 V
Connection > 690 V
k
l
AC/DC
24...240 V
6 A6 A
A1
A2
L1 L2 L3
RS
E
C
50mA / 5A
NGR
NGRM700
CT
Rs (G1)
E (G)
N
CD...
31 32 3421 22 24
11 12 14
FP200-NGRM
X1
Dig. IN/OUT Ethernet
6A6A6A
L1
L2
L3
NGR
fault
Ground
fault Trip
Circuit breaker
k
l
AC/DC
24...240 V
6 A6 A
A1
A2
L1 L2 L3
RS
E
C
50mA / 5A
NGR
NGRM700
CT
Rs (G1)
E (G)
N
CD...
31 32 3421 22 24
11 12 14
FP200-NGRM
X1
Dig. IN/OUT Ethernet
PT *
L1
L2
L3
NGR
fault
Ground
fault Trip
Circuit breaker
* PT ratio can
be selected in
the NGRM700

4NGRM700_D00292_00_Q_XXEN/09.2017
CT installation
NGRM700
C50mA
lk
NGR CD...
N N
W...(AB)

5
NGRM700_D00292_00_Q_XXEN/09.2017
Menu structure
1. Data meas. values
4. Pulser
3. History
5. Display
8. Info
History, Delete
Pulser, t
Impuls
R
NGR,
I
NGR
HRG system
CT
NGR
Phase
monitor
Field calibration
U
sys
(L-L), f, I
NGR nom,
R
NGR nom
CT primary, CT secondary, CT connection
9. Alarm Acknowledge, Reset, Test
R
NGR
,R
NGR rel
,Method, R
sense,
I
rms
, I
rms rel
, U
rms
, U
rms rel,
I
fund
,
I
fund rel
, U
fund
, U
fund rel,
I
harm
, I
harm rel
, U
harm
, U
harm rel,
U
L1L2
, U
L2L3
,
U
L3L1
, f, U
1-E rms
, U
2-E rms
, U
3-E rms
, T
6. HRG settings
7. Device settings Language, Clock, Interface, Display, Password, Factory setting,
Software, Service
2. Harmonics IU
Device information, Software information,
Clock and date information, Ethernet information
Earth fault relay
NGR relay
Trip relay
Analogue
Dig. in/out
Buzzer
Mode, Relay test
Mode, Relay test
Mode, Relay test
System OUT, Pulser OUT,
Pulser IN, Reset IN, Test IN
Buzzer alarm, Buzzer test
Mode, Function
U
NGR Trip
, I
NGR Trip
, >R
NGR
, <R
NGR
, t
Trip
,
System trip, t
restart,
Alarm stored,
Max. no. of restarts, Trip signal, Upper limit harmonics,
Lower limit harmonics
Method, PT primary, PT secondary
Phase monitor, PT primary, PT secondary
Response
values
System
settings

6NGRM700_D00292_00_Q_XXEN/09.2017
Initial commissioning
1. Selecting language
2. HRG system (menu 6.1)
 System voltage Usys phase-phase (menu 6.1)
for Usys ≤ 4,3 kV: CD690, CD1000, CD4200, CD5000 (20 k)
for Usys > 4,3 kV: CD14400 (100 k)
 Conversion ratio of the used potential transformers (UNGR nom) if available
 Current through the NGR (INGR nom)
 Conversion ratio of the used measuring current transformer
 Resistance RNGR nom
3. Setting response values (menu 6.5)
 Shutdown threshold value for voltage ( U
NGR
)
 Shutdown threshold value for current ( I
NGR
)
 Shutdown threshold values for resistance ( R
NGR
)
4. System settings of the relays (menu 6.6)
The factory setting for the relays is N/C operation. In case of a self test, the relays switch.
5. Field calibration (menu 6.7)
After the parameters have been entered, a field calibration can be carried out to set RNGR = RNGR nom.
Mute buzzer:
Low shutdown threshold values: may lead to false tripping.
High shutdown threshold values: the device may not trip at all.
N/C operation: Relay is energised during normal operation and is deactivated in the
event of a fault ("fail-safe")
N/O operation: Relay isde-energised in normaloperation and is activated in the event of
a fault ("not fail-safe")
OK
>
RESET OK
MENU OK
>
6 x
OK
7. … 7.1 …
>
>
OK
Display: 1. …

7
NGRM700_D00292_00_Q_XXEN/09.2017
6. Shutdown signal RMS, fundamental frequency, harmonics
What threshold violations should trigger the trip relay?
A trip signal can be:
 RMS : The r.m.s. value of I or U over the entire frequency range (up to approx. 3.8 kHz).
 Fundamental frequency : Only the r.m.s. component of the fundamental frequency (50 or 60 Hz).
 Harmonics
The filtered r.m.s. value on the set harmonics
H0 = DC
H1 = fundamental frequency
H2 = 2 x fundamental frequency
…
H32 = 32 x fundamental frequency
7. Initial measurement
During device start all measured values are recorded.
In the "Harmonics" measured value display (menu 2) all spectral lines are always
displayed. This is independent of the trip signal setting.
On the standard display, the trip signal is indicated as
 resistance in Ω or %
 current in A or %
Setting is entered in the main menu > 5: Display.

©Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!
Photos: Bender Archiv
Bender GmbH & Co. KG
Postfach 1161 • 35301 Gruenberg • Germany
Londorfer Str. 65 • 35305 Gruenberg • Germany
Tel.: [phone] • Fax: [phone]
E-Mail: [e-mail] • www.bender.de
Factory settings
Menu Factory setting Menu Factory setting
Menu 6.1: HRG system Menu 6.5: Response values
1. Usys (L-L) 400 V 1. UNGR trip 60 %
2. Frequency 50 Hz 2. I NGR trip 60 %
3. INGR nom 5 A 3. > RNGR 150 %
4. RNGR nom 470 Ω 4. < RNGR 50 %
Menu 6.2: CT 5. ttrip 5 s
1. CT primary 600 6. System trip yes
2. CT secondary 1 7. trestart 5 s
3. CT connection 50 mA 8. Alarm stored on
Menu 6.3: NGR 9. Restart count 2
1. Method auto 10. Trip signal RMS
2. PT primary 1 11. Upper limit harmonic 32
3. PT secondary 1 12. Lower limit harmonic 0
Menu 6.4: Phase monitor Menu 6.6: System settings
1. Phase monitor on 1. Ground fault relay Mode N/C (fail-safe)
Rel. test on
2. PT primary 1 2. NGR relay Mode N/C (fail-safe)
Rel. test on
3. PT secondary 1 3. Trip relay Mode N/C (fail-safe)
Rel. test on
4. Analogue Mode 4-20 mA
Function R NGR
5. Dig. in/out System OUT N/C (fail-safe)
Pulser OUT N/O (not fail-safe)
Pulser IN active high
RESET IN active high
TEST IN active high
6. Buzzer Buzzer alarm on
Buzzer test on