Online Exporter Dynamic Braking Resistors Calculations - Neutral Grounding Resistor, NGR EGR – Wepower

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Online Exporter Dynamic Braking Resistors Calculations - Neutral Grounding Resistor, NGR EGR – Wepower Detail:

█ Product Features

1. Voltage range：0.33 ～110KV

2. Rated Current: 1～5000A

3. Resistance Range：0.1Ω∽1500Ω

4. Working time: 5s，10s，30s，60s，10mins，working continuous

5. Ingress Protection：IP20～IP55

6. Installation：Indoor、Outdoor;

7. Auxiliary parts: disconnecting switch, circuit breaker, CT, PT etc.

8. Resistor temperature rise:

1）Rated time :10s, maximum temperature rise≤760K；

2）Rated time : 10s<t<10mins, maximum temperature rise ≤610K;

3）Working continuous, maximum temperature rise ≤385K;

█ Wire Diagram

The electrical connection mode between neutral point three-phase AC power grid and earth, called grounding mode for neutral point. Neutral point grounding resistor principle diagram as follows:

Neutral point of transformer, the grounding resistor has two ways:

On the secondary side the transformer is a star connection method, the neutral point grounding resistor straight. (see Figure.1)

On the secondary side the transformer is a triangle connection method, the neutral point grounding transformer grounding through grounding transformer. (see Figure. 2)

█ Production Selection Table

6.3KV series neutral grounding resistor selection table, as following:

Type	Neutral Voltage		Resistance	Fault Current	Rated Time	Protection Class	Enclosure
	Line Voltage	Phase Voltage	Resistance	Fault Current	Rated Time	Protection Class	Length	Width	High
	KV	KV	[Ω]	[A]	[s]	IP	[mm]	[mm]	[mm]
TNGR	6.3	3.64	72.8	50	10	IP2X	800	1000	1180
TNGR	6.3	3.64	36.4	100	10	IP2X	800	1000	1180
TNGR	6.3	3.64	18.2	200	10	IP2X	800	1000	1180
TNGR	6.3	3.64	14.6	250	10	IP2X	800	1000	1180
TNGR	6.3	3.64	12.1	300	10	IP2X	800	1000	1180
TNGR	6.3	3.64	9.1	400	10	IP2X	1000	1000	1180
TNGR	6.3	3.64	7.3	500	10	IP2X	1000	1000	1180
TNGR	6.3	3.64	6.1	600	10	IP2X	1000	1000	1180
TNGR	6.3	3.64	4.6	800	10	IP2X	1000	1000	1180
TNGR	6.3	3.64	3.6	1000	10	IP2X	1000	1000	1180
TNGR	6.3	3.64	3.0	1200	10	IP2X	1000	1000	1180
TNGR	6.3	3.64	2.6	1400	10	IP2X	1000	1000	1180
TNGR	6.3	3.64	2.3	1600	10	IP2X	1000	1000	1180

10.5KV series neutral grounding resistor selection table，as following:

Type	Neutral Voltage		Resistance Value	Fault Current	Rated Time	Protection	Enclosure
	Line Voltage	Phase Voltage	Resistance Value	Fault Current	Rated Time	Protection	Length	Width	High
	KV	KV	[Ω]	[A]	[s]	IP	[mm]	[mm]	[mm]
TNGR	10.5	6.06	121.2	50	10	IP2X	800	1000	1480
TNGR	10.5	6.06	60.6	100	10	IP2X	800	1000	1480
TNGR	10.5	6.06	30.3	200	10	IP2X	800	1000	1480
TNGR	10.5	6.06	24.3	250	10	IP2X	800	1000	1480
TNGR	10.5	6.06	20.2	300	10	IP2X	800	1000	1480
TNGR	10.5	6.06	15.2	400	10	IP2X	1000	1000	1480
TNGR	10.5	6.06	12.2	500	10	IP2X	1000	1000	1480
TNGR	10.5	6.06	10.1	600	10	IP2X	1000	1000	1480
TNGR	10.5	6.06	7.6	800	10	IP2X	1200	1000	1480
TNGR	10.5	6.06	6.1	1000	10	IP2X	1200	1000	1480
TNGR	10.5	6.06	5.1	1200	10	IP2X	1200	1000	1480
TNGR	10.5	6.06	4.3	1400	10	IP2X	1200	1000	1480
TNGR	10.5	6.06	3.8	1600	10	IP2X	1200	1000	1880
TNGR	10.5	6.06	3.4	1800	10	IP2X	1200	1000	1880

20KV series neutral grounding resistor selection table，as following：

Type	Neutral Voltage		Resistance Value	Fault Current	Rated Time	Protection	Enclosure
	Line Voltage	Phase Voltage	Resistance Value	Fault Current	Rated Time	Protection	Length	Width	High
	KV	KV	[Ω]	[A]	[s]	IP	[mm]	[mm]	[mm]
TNGR	20	11.55	231	50	10	IP2X	1300	2300	2300
TNGR	20	11.55	115.5	100	10	IP2X	1300	2300	2300
TNGR	20	11.55	57.7	200	10	IP2X	1300	2500	2300
TNGR	20	11.55	46.2	250	10	IP2X	1300	2700	2300
TNGR	20	11.55	38.5	300	10	IP2X	1300	2700	2300
TNGR	20	11.55	28.9	400	10	IP2X	1300	2500	2300
TNGR	20	11.55	23.1	500	10	IP2X	1300	2500	2300
TNGR	20	11.55	19.3	600	10	IP2X	1300	2700	2300
TNGR	20	11.55	14.4	800	10	IP2X	2100	2500	2000
TNGR	20	11.55	11.6	1000	10	IP2X	2100	2500	2000
TNGR	20	11.55	9.6	1200	10	IP2X	2100	2500	2000
TNGR	20	11.55	8.3	1400	10	IP2X	2100	2500	2000
TNGR	20	11.55	7.2	1600	10	IP2X	2100	2700	2000
TNGR	20	11.55	6.4	1800	10	IP2X	2100	2700	2000
TNGR	20	11.55	5.8	2000	10	IP2X	2100	2700	2000

35KV series neutral grounding resistor selection table，as following：

Type	Neutral Voltage		Resistance Value	Fault Current	Rated Time	Protection	Enclosure
	Line Voltage	Phase Voltage	Resistance Value	Fault Current	Rated Time	Protection	Length	Width	High
	KV	KV	[Ω]	[A]	[s]	IP	[mm]	[mm]	[mm]
TNGR	35	20.2	404.6	50	10	IP2X	1600	2600	2524
TNGR	35	20.2	202.3	100	10	IP2X	1600	2600	2524
TNGR	35	20.2	101.2	200	10	IP2X	1600	2800	2524
TNGR	35	20.2	80.9	250	10	IP2X	1600	3000	2524
TNGR	35	20.2	67.4	300	10	IP2X	1600	3000	2524
TNGR	35	20.2	50.6	400	10	IP2X	1600	2800	2524
TNGR	35	20.2	40.5	500	10	IP2X	1600	2800	2524
TNGR	35	20.2	33.7	600	10	IP2X	1600	3000	2524
TNGR	35	20.2	25.3	800	10	IP2X	2400	2800	2144
TNGR	35	20.2	20.2	1000	10	IP2X	2400	2800	2144
TNGR	35	20.2	16.9	1200	10	IP2X	2400	2800	2144
TNGR	35	20.2	14.5	1400	10	IP2X	2400	2800	2144
TNGR	35	20.2	12.6	1600	10	IP2X	2400	3000	2144
TNGR	35	20.2	11.2	1800	10	IP2X	2400	3000	2144
TNGR	35	20.2	10.1	2000	10	IP2X	2400	3000	2524

Remark: For other technical parameters & requirements, please contact with our company’s business man.

Stainless steel resistors ,CT is optional(if other equipment like grounding transformer, isolating switch, vacuum contactor and the rated time ＞10S, the enclosure dimensions will be adjusted )

█ Main Executive Standard

• Specification for neutral-earth resistance in distribution system

• Insulation co-ordination of high voltage transmission and transformation equipment

• Degrees of protection provided by enclosure

• Current transformers

• High-voltage ceramic wall bushings technical specification

• High voltage post insulators ceramic material Part 1: Technical Specification

• High voltage test techniques Part 1: General requirements

• Requirements, Terminology and Test Procedure for Neutral Grounding Devices

█ Ordering Information

1. Rated voltage

2. Rated current

3. Resistance value

4. Rated time

5. Inlet and outlet way

6. Cabinet material、color

7. CT parameter

8. Grounding transformer parameter

9. Class of protection

10. Operating environment

11. Other special requirements, etc.

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