10.5KV Grid Type NGR Neutral Grounding Resistor For Transformer

10.5KV Grid Type NGR Neutral Grounding Resistor For Transformer

Product Application Field

The neutral point grounding resistance of the transformer is widely used in the secondary point of the transformer

secondary and the stator side of the generator. After connecting a resistor in series with the neutral point of the

equipment (or the neutral point drawn by the grounding transformer), the intermittent arc light is discharged The

electromagnetic energy in the overvoltage will reduce the neutral point potential and the recovery speed of the fault

phase will also slow down, thereby reducing the possibility of arc reignition, suppressing the amplitude of the grid

overvoltage, and enabling selective ground protection achieve.

It is mainly used for power transmission and distribution systems with a single-phase grounding fault and a large capacitive

current, and a small-capacity current, but is used to prevent the resonance overvoltage of power plants.

According to different capacitor currents, it can be divided into high resistance grounding and low resistance grounding.

At present, neutral point grounding resistance is widely used in urban distribution networks, large industrial parks, power

plants, offshore platform distribution systems, large chemical companies.

Product Features:

1. The neutral point grounding resistance of the transformer is made of stainless steel alloy imported from abroad,the

temperature rise coefficient is low, and the resistance change rate is small

2. Double insulation of ceramic and mica, high stability

3. Bolt connection, easy to disassemble, reliable connection

4. Unique steel grid structure design: easy to dissipate heat;

5. The heat capacity of the resistance sheet is large: through a unique processing technology, the rated power of a single

resistance sheet can reach 1200 watts;

6. The resistance deviation is small: the manufacturing tolerance of the resistance sheet can be less than ± 5%;

7. The resistance of the resistance sheet can be adjusted in a wide range: single sheet range 0.005 ~ 11.7Ω;

8. The insulation performance of the resistance sheet is strong: the resistance of the resistance BANK and the support can reach 8.3KV;

9. The change rate of resistance value in the hot state is small: the resistance sheet adopts imported stainless steel material, the temperature

coefficient is low, and the change rate of the resistance value in the hot state can be no higher than 20%

10. Strong anti-vibration: The stainless steel bolts are used to connect the resistance plates, and the anti-vibration is strong;

11. Strong corrosion resistance: The resistance film is made of high temperature alloy material, which has extremely strong corrosion resistance;

12. High cost performance: compact structure, adjustable number of resistors, high cost performance.

13. It can be matched with an intelligent monitoring device, which can effectively monitor the ground fault current and voltage, and provide switching and alarm contacts.

Technical Features:

1. Fault current: 1 ~ 5000A

2. System voltage: 0.38kV ~ 110kV (3, 6, 10, 35)

3. Fever time: 5S, 10S, 30S, 60S, continuous

4. Resistance (20 ℃): 0.01 ~ 1500Ω

5. Temperature rise: short-term temperature rise (10 ~ 60S, the maximum does not exceed 760 ℃

6. Continuous temperature rise: the maximum is not more than 385 ℃

Maintenance-free, quick and easy replacement

Compact structure and easy installation

Shell protection grade: IP20 ~ IP56

Optional accessories:

•Intelligent monitoring device, which can monitor current, temperature and failure times

•Isolation switch

•Current transformer, voltage transformer

•Temperature and humidity controller and heater

•Lighting in the cabinet