Products Description

Our ngr resistor uses FeCrAl, NiCr, 304 stainless steel, or 316 stainless steel resistor elements. The cabinet can integrate a current transformer, isolating switch, and intelligent monitoring device.

Technical Principle

The resistor converts ground-fault electrical energy into heat and limits neutral current to the specified value and duration. Element material, resistance value, insulation level, and thermal capacity are selected according to the network grounding design.

Product Features

The ngr resistor offers several alloy choices for matching thermal duty and resistance stability. Current and time options cover short-time, extended, and continuous grounding duties. Indoor and outdoor cabinet constructions support different installation environments. Optional measurement and isolation parts make protection coordination easier.

Operating Conditions

Install the product in a clean, ventilated location without corrosive gas, conductive dust, water ingress, severe vibration, or strong impact. Provide reliable protective grounding, maintain the required electrical clearances, and use the rated auxiliary power supply. Confirm ambient temperature, humidity, altitude, enclosure protection, cable routing, and communication conditions before production and installation.

Product Parameters

Parameter	Details
Grounding current	5-2000 A
Duty-time options	10 s, 30 s, 60 s, 5 min, 10 min, 30 min, 2 h, or continuous
Resistor materials	FeCrAl, NiCr, 304 stainless steel, or 316 stainless steel
Material resistivity	FeCrAl 1.35-1.53; NiCr 1.09-1.12; 304 0.72; 316 0.73 μΩ·m
Long-term material temperature	FeCrAl ≤1100°C; NiCr ≤1000°C; 304 ≤500°C; 316 ≤600°C
Allowed rise for 10/30/60 s	760°C
Allowed rise for 10 min	610°C
Allowed rise for continuous duty	385°C
Cabinet protection	Indoor IP3X/IP4X; outdoor IP5X

Product Advantages

The ngr resistor offers several alloy choices for matching thermal duty and resistance stability.
Current and time options cover short-time, extended, and continuous grounding duties.
Indoor and outdoor cabinet constructions support different installation environments.
Optional measurement and isolation parts make protection coordination easier.

Main Applications

The ngr resistor is used for generator, transformer, and distribution-system neutral points that require controlled ground-fault current.

It is used in utility substations, power plants, mines, petrochemical facilities, and renewable-energy systems.

It can be paired with an existing neutral point or a grounding transformer.

Components

Part	Function
Resistor element bank	Sets the specified resistance and thermal duty.
Current transformer	Measures neutral current for protection and indication.
Isolating switch	Provides a defined isolation point when selected.
Cabinet and monitor	Protect the assembly and provide status supervision.