YNGR Series Neutral Grounding Resistor

Product

YNGR Series Neutral Grounding Resistor

Application 

Range

YNGR series neutral point grounding resistance cabinet is suitable for the operation mode of neutral point through resistance grounding. It is widely used in transformers of 6 ~ 66KV alternating current power grids such as power system of power plant, power supply system of substation, power distribution system of industrial and mining enterprises Or generator neutral point.

Working 

Principle

When a fault occurs in the power system (such as a partial short circuit or open circuit in the power grid), the neutral point of the power distribution system will be shifted. At this time, the neutral point ground resistance will force the neutral point of the power distribution system to ground and limit its failure. Electrical currents allow the power system time to detect, diagnose, protect, and switch over, thereby avoiding possible line or equipment damage. Since the neutral point resistance can absorb a large amount of resonance energy, in the grounding method with a resistor, the fundamental suppression of the system resonance overvoltage. The neutral point grounding resistance is very small when the power transmission and distribution system works normally, and when the power system fails, the current flowing through the neutral point grounding resistance is large and the time is very short. It is usually used for short-term work system. The neutral point grounding resistance of our company is designed in accordance with ANSI / IEEE 32.1972 and IEC625 and related standards.

Use Environment

1.Installation site: The altitude does not exceed 1000m.

2.The highest ambient air temperature does not exceed + 40℃, and the lowest ambient temperature is not lower than -15℃.

3.Environmental humidity: daily average relative humidity W95%, monthly average relative humidity W90%.

4.The surrounding air should not be significantly polluted by corrosive or flammable gases, water vapor, etc .

5.No serious pollution and frequent severe vibration.

Technical Performance And Characteristics

1.The resistance element is made of stainless steel, high temperature resistance and strong oxidation resistance.

2.Resistance element error V±5%, resistance temperature coefficient .

3.Temperature rise: no more than 760K within 10s of power-on time.

4. Can be installed with isolation switch, convenient maintenance.

Implementation Standards

1.DL/T780-2001:Neutral point resistors for power distribution systems.

2.DI/T620-1997:Overvoltage protection and insulation coordination of AC electrical devices.

3.GB/T16927:High voltage test technology.

4.GB1208-1997:Currenttransformer.

5.GB4208-93:Enclosure protection level (IP code).

6.IEEE32-1972 Standard:Techniques, terminology and tests for neutral grounding devices.