12KV Switchgear Compact Substation

12KV Switchgear Compact Substation Ambient Temperature: -40 - 40celsius Max Elevation: 3000m Max Humidity:95%

12KV Switchgear Compact Substation

Mingrui has outstanding technical researching team and superior equipments, specially concentrate on research & development, production, sales and service of neutral grounding series products of power distribution system. The transformer neutral grounding resistance cabinet we developed and produced is applicable to 6~35KV power distribution grid of cable running lines in cities, large industrial enterprises, factories, airports, seaports, subway and etc. as well as 0.66KV system in mine digging and 0.4kv/6kv/10kv system in power plants.

Standards Carried Out

DL/780-2001  Neutral Grounding Resistance in Power Distribution

GB6450      Dry-Type Power Transformer

DL/T620-1997  Overvoltage Protection and Insulation Co-ordination of AC Electrical Equipments

GB/T16927-1997  Experimental Technique of High Voltage

GB1208-1997    Current Transformer

GB4208-93       Shell Protection Grade (IP code)

IEEE32-1972 Standard   Technique, Terms and Experiment of Neutral Grounding Device

GB311.1-1997    Insulation Co-ordination of Transmissional and Distributed Device of High Voltage.

DL/T593-1996   Common Specifications for Purchasing High Voltage Switch Equipment.

GB50150-1991   Electrical Equipment’s Hand-over and Test Standard of Electrical Device Installation Project.

Product Features

Typical Technical Parameters in Some Cases
Model No	System Voltage  (kv)	Rated Voltage (kv)	Current Flowing Time (s)	Rated Resistance  (ohms +-5%)	Inslutaion Withstanding  Voltage kv
					8/20 µs  Linghtning Strike	1 min  PF Voltage
MRD-BJ-6/36.4	6.3	100	10	36.4	60	32
MRD-BJ-6/18.2	6.3	200	10	18.2	60	32
MRD-BJ-6/9.09	6.3	400	10	9.09	60	32
MRD-BJ-6/6.06	6.3	600	10	6.06	60	32
MRD-BJ-10/15.16	10.5	400	10	15.16	75	42
MRD-BJ-10/10.10	10.5	600	10	10.1	75	42
MRD-BJ-10/7.57	10.5	800	10	7.57	75	42
MRD-BJ-10/6.06	10.5	1000	10	6.06	75	42
MRD-BJ-35/20.20	35	1000	10	20.2	185	95
MRD-BJ-35/10.10	35	2000	10	10.1	185	95
Various NGRs could be designed as per customers' need with resistance from 1-2000ohms,current from 1-2000A and time at 10s, 15s, 30s, 60s or 2h.

Main Composed Elements
Resistor	made of imported stainless steel or domestic stainless steel, high conductivity and temperature coefficient,corrosion resisting,  thermostability, operation safty
Grounding Transformer	Optional, if tansformer is angle-connected, grounding transformer should be used.
Counter	Optional, for recording grounding times of NGR
Disconnector	Optional, for convenienting maintainance
Heater and Humidity Controller	Optional
Monitor	Optional, for monitoring unbalanced current,  temperature of resistor and cabinet inside, grounding fault current and grounding times  when single phase grounding.And transfering the datas to main controlling room.

Operation Conditions

1. Mostly applied outdoor in system of 50Hz and 60Hz

2. Max Altitude is 3500m. Because of high altitude and bad thermal discharging in plateau, please indicate in order if in this situation.

3. Ambient Temp is between -20°C~+70°C and relative humidity does not excess 95%.

4. Wind pressure does not excess 700Mpa (equivalent to 34m/s)

5. Earthquake intensity is less than 8 degree.

6. Thickness of ice coverage is less than 10mm

7. Air dusty grade is not higher than IV grade

8. No corrosive or explosive gas and conductive dust around installation site.

9. As the resistor is a heat generating component, it should be installed in place with some space left around, and be away from heat source.

Notice for purchase

1. system rated voltage

2.short-time withstand current;

3. normal resistance;

4. with current transformer or not; transformation ratio, capacity and compound deviation of the current transformer;

5. method of wiring (optional): a. wire in from the top, and out at the bottom, b. wire in and out from the bottom, c. wire in and out from the side, d. wire in from the side and out at the bottom;

6. durable time for short-time withstand current;

7. material of resistance cabinet, protection grade of (IP), color code and installation site of the resistor cabinet;

8. with earthing record and temperature and humidity control equipment or not

12KV Switchgear Compact Substation