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NGRM500 (HRG)NGRM550 (LRG)

NGRM500 (HRG)NGRM550 (LRG)
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NGRM500 (HRG) NGRM550 (LRG) Neutral Grounding Resistor Monitor

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Neutral Grounding Resistor Monitor Product description The NGRM500 is only intended for use in high-resistance grounded systems. The NGRM550 is only intended for use in low-resistance grounded systems. In these systems, the NGRM5… monitors • the current through the neutral-grounding resistor (NGR), • the voltage between the star point of the transformer and ground (voltage drop across the NGR), • the condition of the neutral grounding resistor (NGR). Device features • Determination of RNGR with passive and active measurement methods • Continuous monitoring of the RNGR even if the...

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GROUND FAULT Display elements Device buttons Operation LED, green; on when power supply is available The LC display shows device and measurement information. The LED is on when there is either a device fault or a connection fault, and when the device is in maintenance mode. Navigates up in a list or increases a value. 5 - NGR FAULT The LED flashes in case of a prewarning: NGR fault detected, NGR fault relay has tripped, trip relay has not tripped yet (tNGR trip elapses). Cancels the current process or navigates one step back in the device menu. Confirms and resets alarms. Navigates...

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Connection: Star connection Circuit breaker L1 The “N” connection of the CD-series coupling device should be as close to the transformer star point as possible. Connection: Star connection with pulser Circuit breaker L1 The “N” connection of the CD-series coupling device should be as close to the transformer star point as possible. An intermediate relay may be required between the power contactor of the pulser and the digital output X1.

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Connection: Artificial neutral (delta connection) zigzag transformer If no star point is available, the following circuit can create an artificial neutral. Circuit breaker L1 L2 L3 Connection to star point Connection to RS of the NGRM5… PE Connection to the protective earth conductor of the installation (PE)

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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 following table helps you with the choice: System type Transformation ratio Bender measuring current transformer Measuring range (see CTUB103 manual) 5 A 100:1 10 A 200:1 25 A 500:1 Connecting cable Connection of relays (ground-fault, NGR-fault and trip relay) NGR-fault relay Trip relay

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Connection to the X1 interface Pin assignment X1 interface Digital 1 (configurable: pulser, NGR method) Open Collector: Pulser OUT Open Collector: Device condition (Device health) Output for supply of external relays (+24 V, max. 100 mA) X1: Input I1…3 The input is only detected as “activated” after the contact has been activated for at least 150 ms. This way, short interference pulses are ignored. X1 Active high Analogue output Connection to Q1, Q2: external relay or PLC. Switch Digital 1, active Reset, passive Test open closed Digital 1, active Reset, passive Test < 150 ms Input I1…3:...

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Technical Data Insulation coordination according to IEC 60664-1/IEC 60664-3/DIN EN 50187 Definitions Supply circuit (IC1) (A1, A2) Measuring circuit/Control circuit (IC2) (RS, E, CT), (X1, Ethernet) Output circuit 1 (IC3) (11, 12, 14) Output circuit 2 (IC4) (21, 22, 24) Output circuit 3 (IC5) (31, 32, 34) Rated voltage 250 V Overvoltage category III Rated impulse voltage IC1/(IC2…5) 4 kV IC2/(IC3…5) 4 kV IC3/(IC4…5) 4 kV IC4/(IC5) 4 kV Rated insulation voltage IC1/(IC2…5) 250 V IC2/(IC3…5) 250 V IC3/(IC4…5) 250 V IC4/(IC5) 250 V Pollution degree exterior 3 Safe isolation (reinforced...

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Ground-fault, NGR, trip relay Switching elements Operating mode Electrical endurance, number of cycles Switching capacity Contact data acc. to IEC 60947-5-1 Rated operational voltage AC Utilisation category Rated operational current AC Rated operational current AC (for UL applications) Rated operational voltage DC Utilisation category Rated operational current DC Minimum current Connection changeover contacts configurable fail-safe/non-fail-safe 10,000 2000 VA/150 W 250 V/250 V AC-13/AC-14 5 A/3 A 3 A/3 A 220/110/24 V DC-12 0.1/0.2/1 A 1 mA at AC/DC > 10 V Environment/EMC EMC immunity (IEC...

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Ordering information Supply voltage Us / Frequency range Hz System type Suitable system components Type Measuring current transformer Voltage Usys CD-series coupling device max. connected measuring current transformers Voltage supply for AC/DC measuring current transformers CTUB103… Bender GmbH & Co. KG Londorfer Straße 65 • 35305 Grünberg • Germany Tel.: +49 6401 807-0 • info@bender.de • www.bender.de Canada • Missisauga ON, Canada 800.243.2438 / 905.602.9990 • info@bender-ca.com www.bender-ca.com USA, Mexico, Central America • Exton PA, USA 800.356.4266 / 610.383.9200 • info@bender.org...

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NGRM500 (HRG)NGRM550 (LRG) 10Pages

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NGRM500 (HRG)NGRM550 (LRG)
10Pages