Bender NGRM700 User manual

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

X1 ETH R

RJ45: Ethernet

RJ45: Remote

max. 5 m

Switch

M+

NGRM700

NGRM700_D00292_00_Q_XXEN/09.2017

2NGRM700_D00292_00_Q_XXEN/09.2017

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

60.236

mm in

135.5

65.5

35.6

144

5.8

5.33

2.58

1.40

5.67

2.38

0.23

NGRM700_D00292_00_Q_XXEN/09.2017

Connection ≤ 690 V

Connection > 690 V

AC/DC

24...240 V

6 A6 A

L1 L2 L3

50mA / 5A

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

AC/DC

24...240 V

6 A6 A

L1 L2 L3

50mA / 5A

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

* PT ratio can

be selected in

the NGRM700

4NGRM700_D00292_00_Q_XXEN/09.2017

CT installation

NGRM700

C50mA

NGR CD...

N N

W...(AB)

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

NGR,

NGR

HRG system

NGR

Phase

monitor

Field calibration

sys

(L-L), f, I

NGR nom,

NGR nom

CT primary, CT secondary, CT connection

9. Alarm Acknowledge, Reset, Test

NGR

rel

,Method, R

sense,

rms

rms rel

, U

rms

rms rel,

fund

fund rel

, U

fund

fund rel,

harm

, I

harm rel

, U

harm

, U

harm rel,

L1L2

, U

L2L3

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

System OUT, Pulser OUT,

Pulser IN, Reset IN, Test IN

Buzzer alarm, Buzzer test

Mode, Function

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 (

NGR

)



Shutdown threshold value for current (

NGR

)



Shutdown threshold values for resistance (

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")

RESET OK

MENU OK

6 x

7. … 7.1 …

Display: 1. …

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

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

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

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

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