Neutral Grounding Resistor Panel

Neutral Earthing Resistor For Transformer

CONTENTS

1.Brief Introduction to Product....................................................................................3

2. Applicable Standards...............................................................................................4

3. The Characteristic of the Product............................................................................4

4. Model Instruction.....................................................................................................6 

5. Typical Technology Parameters...............................................................................6

6. Schematic Diagram for Wire Connection................................................................7

7. Outline and Installation Dimension.........................................................................9

8. Service Condition...................................................................................................10

9. Notice for Ordering................................................................................................10

10. Cautions of Site Installation.................................................................................11

11. Checking and Testing...........................................................................................12

12. Maintenance.........................................................................................................13

13. Packaging, Transportation and Storage................................................................14

1. Brief Introduction to Product

With neutral grounding resistance is installed, when nonmetal grounding, the current flowing through grounding point and neutral would be much less than that when metal grounding. Meanwhile sound phase voltage rise is lowered a lot and zero-sequence voltage is half of that when single-phase metal grounding. Therefore, adopting neutral grounding via resistance could decrease transient overvoltage when single-phase grounding, and eliminate arc flash hazards like transient overvoltage and some resonant overvoltage, and moreover it could adopt simple relays to quickly locate the fault line and clear it up. 

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 we developed and produced is applicable to 6~35KV power distribution grid of cable 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.

2. Applicable Standards 

The design of the product complys with the flowing standards:

DL/780-2001   Neutral Grounding Resistance in Power Distribution

IEC726        Dry-Type Power Transformer

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

Electrical Equipments

IEC60-1        Experimental Technique of High Voltage

GB1208-1997   Current Transformer

IEC60529:2001  Enclosure Protection Degree (IP code)

IEEE32-1972   Technique Terms and Experiment of Neutral Grounding Device

IEC60081      Insulation Co-ordination of Transmission and Distribution

Device of High Voltage.

DL/T593-1996   Common Specifications for Purchasing High Voltage 

 Switch Equip