Chapter 1-4 Definitions of Protective Relays and Control
Systems
Article 14. Protective Devices
As stipulated in Technical Regulation.
Article 15. Types of Protection
As stipulated in Technical Regulation.
Article 16. Remote Control Systems
As stipulated in Technical Regulation.
Article 17. Secondary Circuits
As stipulated in Technical Regulation.
Chapter 1-5 Definitions of Metering
Article 18. Electricity Meter
As stipulated in Technical Regulation.
Article 19. Multi Tariff Meter
As stipulated in Technical Regulation.
Article 20. Checking Meter
As stipulated in Technical Regulation.
Chapter 1-6 Definitions of Earthing
Article 21. Earth Fault
As stipulated in Technical Regulation.
Article 22. Earthing System
1)Earthing Electrode
2)Earthing Conductors
As stipulated in Technical Regulation.
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Article 23. Zero Area of Voltage
As stipulated in Technical Regulation.
Article 24. Resistance of Earthing
As stipulated in Technical Regulation.
Article 25. Earth Fault Current
1)Large Earth Fault Current
2)Small Earth Fault Current
As stipulated in Technical Regulation.
Article 26. Neutral of Power System
For 500kV, 220kV, 110kV, 22kV and 15kVpower system, direct grounding is applied to itsneutral. Grid 6kV, 10kV, 35kV is isolated neutral with arc-suppression coil, in special cases can be grounded directly.
|
Table 26 |
Neutral point grounding method |
Voltage level |
|
Neutral point grounding method |
|
|
|
110,220,500kV |
Direct grounding |
|
|
|
|
35kV |
Isolated neutral or Resistance grounding |
|
|
|
|
15, 22kV |
Direct grounding (3-phase 3-wire) or grounding repeatedly (3-phase 4-wire) |
|
|
|
|
6, 10kV |
Isolated neutral |
|
|
|
|
less than 1kV |
Direct grounding (grounding neutral, grounding repeatedly, neutral earthing |
|
combined) |
|
|
|
|
|
|
|
|
1)Direct earthed neutral
2)Isolated Neutral
3)Effective Earthed Neutral
4)Neutral Conductor
As stipulated in Technical Regulation.
Article 27. Protective Breaking
As stipulated in Technical Regulation.
Article 28. Main Insulation
As stipulated in Technical Regulation.
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Article 29. Auxiliary Insulation
As stipulated in Technical Regulation.
Article 30. Double Insulation
As stipulated in Technical Regulation.
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