Bender NGRM700 User manual

Quickstart

Neutral Grounding Resistor Monitor

Intended use

The NGRM700 is only intended for use in high-resistance earthed sys-

tems. In these systems, the NGRM700 monitors



the current through the NGR,



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

AModbus RTU (A)

BModbus RTU (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

OFF ON

X1 ETH R

max. 5 m

Switch

RJ45:

Remote

RJ45:

Ethernet

M+

NGRM700

NGRM700_D00292_02_Q_XXEN/06.2018

2NGRM700_D00292_02_Q_XXEN/06.2018

Dimension diagrams basic enclosure and FP200-NGRM

hgf

55.50

61.40

63.35

150

125

230

245

205

223.50

211

0.12

2.19

2.42

2.49

5.91

4.92

9.06

9.65

8.07

8.80

8.31

mm in

6 0.236

Mounting position

top

mm in

135.5

65.5

35.6

144

5.8

5.33

2.58

1.40

5.67

2.38

0.23

5.43+0.02/-0

138+0.5/-0 mm

2.60+0.02/-0 in*

66+0.5/-0 mm*

max. 5.3 mm

* IP 65:

68+0.7/-0 mm

2.68+0.03/-0 in

max. 0.21 in

NGRM700_D00292_02_Q_XXEN/06.2018

Connection ≤ 690 V

Connection > 690 V

AC/DC

24...240 V

6 A6 A

L1 L2 L3

50mA

NGR

NGRM700

Rs (G1)

E (G)

CD...

31 32 3421 22 24

11 12 14

FP200-NGRM

Dig. IN/OUT Ethernet

6A6A6A

NGR

fault

Ground

fault Trip

Circuit breaker

The "N" connection of the

CD-series coupling device

should be as close to the

transformer star point as

possible.

AC/DC

24...240 V

6 A6 A

L1 L2 L3

50mA

NGR

NGRM700

Rs (G1)

E (G)

CD...

31 32 3421 22 24

11 12 14

FP200-NGRM

Dig. IN/OUT Ethernet

PT *

NGR

fault

Ground

fault Trip

Circuit breaker

* The PT ratio can be

selected on the NGRM700

The "N" connection of the

CD-series coupling device

should be as close to the

transformer star point as

possible.

4NGRM700_D00292_02_Q_XXEN/06.2018

Measuring current transformer connection

Depending on the system to be monitored, a suitable measuring current transformer has to be chosen.

All common measuring current transformers (50 mA or 5 A on the secondary side) can be used. The fol-

lowing table helps you with the choice:

CT installation W…AB

System type AC + DC AC AC

I1…10 A 5…25 A 5…25 A

f0…3800 Hz 42…3800 Hz 50/60 Hz

Ratio 600:1 600:1 60:5

Length

connecting cables max. 10 m max. 40 m max. 25 m (4 mm²)

max. 40 m (6 mm²)

IΔn

Type

W35…120AB W20…120

W1-S35…W5-S210

CTB31…41

CT: k NGRM700: 50 mA NGRM700: 50 mA NGRM700: 5 A

CT: l NGRM700: CNGRM700: CNGRM700: C

W...AB

AN420

W...

W...S...

CTB

NGRM700

50mA

50 mm

1.97 in

250 mm

9.84 in

+12VGND–12V

WXS...

NGR CD...

N N

W...AB

NGRM700_D00292_02_Q_XXEN/06.2018

Menu structure

1. Data meas. values

4. Pulser

3. History

5. Display

9. Info

History, Delete

Pulser, tImpuls

RNGR, INGR

HRG system

NGR

Phase

monitor

Field calibration

Usys (L-L), f, INGR nom, RNGR nom

CT primary, CT secondary, CT connection

10. Alarm Acknowledge, Reset, Test

RNGR,RNGR rel,Method, Rsense, Irms,Irms rel, Urms,Urms rel, Ifund,

Ifund rel, Ufund,Ufund rel, Iharm, Iharm rel, Uharm, Uharm rel, UL1L2, UL2L3,

UL3L1, f, U1-E rms, U2-E rms, U3-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

System OUT, Pulser OUT,

Pulser IN, Reset IN, Test IN

Buzzer alarm, Buzzer test

Mode, Function

UNGR Trip, INGR Trip, >RNGR, <RNGR, tNGR trip,

GF trip, tGF trip, trestart, 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

8. Commissioning Setting Language, Setting Clock, Setting Usys L-L, f, INGR nom,

RNGR nom, CTprimary,CTsecondary, CTConnection, Field calibration

6NGRM700_D00292_02_Q_XXEN/06.2018

Recommended minimum value RNGR (tripping level 50 %)

Temperature range –40…+70 °C, field calibration at 25 °C

(Limited temperature range 0…+40 °C, field calibration at 25 °C)

Maximum trip times t(GFtrip) for the used CD-NGRM

The setting for tGF trip must under no circumstances be longer than the maximum possible operating

time of the CD-NGRM… coupling device.

The table shows an overview of the t(GFtrip) settings for the coupling device used:

CD1000/CD1000-2

CD1000-2

CD5000 CD14400

CD25000

Usys 400 V 600 V 690 V 1000 V 2400 V 4200 V 6000 V 6600 V 7200 V 11000 V 14400 V 25000 V

INGR

1 A 231  346  398  577  1386  ———————

5 A 46  69  80  115  277  485  693  762  831  1270  1663  —

10 A (23 Ω) 35  40  58  139  242  346  381  416  635  831  1443 

15 A (15 Ω) (23 Ω) (27 Ω) 38  92  162  231  254  277  423  554  962 

20 A —(17 Ω) (20 Ω) 29  69  121  (173 Ω) 191  208  318  416  722 

25 A ——(16 Ω) (23 Ω) 55  97  (139 Ω) (152 Ω) (166 Ω) 254  333  577 

30 A ———(19 Ω) (46 Ω) 81  (115 Ω) (127 Ω) (139 Ω) 212  277  481 

40 A ——— —(35 Ω) 61  (87 Ω) (95 Ω) (104 Ω) (159 Ω) 208  361 

50 A ——— —(28 Ω) (48 Ω) —(76 Ω) (83 Ω) (127 Ω) (166 Ω) 289 

100 A ——— — —

(24 Ω) ————(83 Ω) (144 Ω)

Usys Coupling device max. tGF trip

(menu 6.5.7)

Ground fault trip setting (menu

6.5.6)

400… 690 V CD1000 24 h on or off

CD1000-2

691…1000 V

CD1000 300 s on

CD1000-2 24 h on or off

CD5000

1001…4300 V CD5000 24 h on or off

4301…14550 V CD14400 60 s on

CD25000

14551…25000 V CD25000 10 s on

NGRM700_D00292_02_Q_XXEN/06.2018

Initial commissioning

The commissioning wizard (menu 8) queries the following parameters; additional settings: menu 6.

Language (8.2) Select

Date (8.3) Set

Time (8.4) Set

Usys L-L (8.5) System voltage

Frequency (8.6) 50 or 60 Hz

INGR nom (8.7)

RNGR nom (8.8)

CT primary (8.9)

CT secondary (8.10)

CT connection (8.11) 50 mA or 5 A

Field calibration (8.12)Start or do not start

1. Setting the response values (menu 6.5)



Trip threshold value for voltage (

NGR

)



Trip threshold value for current (

NGR

)



Trip threshold values for resistance (

NGR

)

2. System settings of the relays (menu 6.6)

The factory setting for the relays is fail-safe. In the case of self test, the relays change state.

3. Field calibration (menu 6.7)

After the parameters have been entered, a field calibration can be carried out to set RNGR = RNGR nom.

4. Trip signal RMS, fundamental frequency, harmonics

Which measured value causes tripping can be selected via the "Trip signal" parameter (menu 6.5.11). A

trip signal can be:



RMS

: The r.m.s. value of

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 where

H0 = DC; H1 = fundamental frequency; H2 = 2 x fundamental frequency; …H32 = 32 x funda-

mental frequency

Low trip threshold values: may lead to false tripping.

High trip threshold values: the device may not trip at all

Fail-safe: The relay is energised during normal operation and is deactivated in the event

of a fault.

Non-fail-safe: The relay is de-energised in normal operation and is activated in the event

of a fault.

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 %) or as

current (in A or %). The setting is entered in "Display" (menu 5).

©Bender GmbH & Co. KG

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.: +49 6401 807-0 • Fax: +49 6401 807-259

E-Mail: info@bender.de • www.bender.de E493737

5. Initial measurement

During device start, all measured values are recorded.

Factory settings

Menu Fact.

settings Menu Fact.

settings

Menu 6.1: HRG system Menu 6.5: Response values

1. Usys (L-L) 400 V 4. < RNGR 50 %

2. CD-NGRM CD1000 5. tNGR trip 0 s

3. Frequency 50 Hz 6. Ground fault trip on

4. INGR nom 5 A 7. tGF trip 5 s

5. RNGR nom 470 Ω 8. Alarm stored on

Menu 6.2: CT 9. trestart 5 s

1. CT primary 600 10. Restart count 2

2. CT secondary 1 11. Trip signal RMS

3. CT connection 50 mA 12. Upper limit harmonic 32

Menu 6.3: NGR 13. Lower limit harmonic 0

1. Method auto Menu 6.6: System settings

2. PT primary 1 1. Ground-fault relay Mode fail-safe

Rel. test on

3. PT secondary 1 2. NGR relay Mode fail-safe

Rel. test on

Menu 6.4: Phase monitor 3. Trip relay Mode fail-safe

Rel. test on

1. Phase monitor on 4. Analogue Mode 4-20 mA

Function R NGR

2. PT primary 1

5. Dig. in/out.

System OUT fail-safe

3. PT secondary 1 Pulser OUT non-fail-safe

Menu 6.5: Response values Pulser IN active high

1. UNGR trip 60 % RESET IN active high

2. INGR trip 60 % TEST IN active high

3. > RNGR 150 % 6. Buzzer Buzzer alarm off

Buzzer test on

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