PART 1 DEFINITIONS

Article 1. General

1)Terms

2)Scope of Technical Regulations

3)Rated Value

4)Noise Level

5)Insulation Level

6)External Insulation

7)Internal Insulation

8)Self-restoring Insulation

9)Non-self-restoring Insulation

10)Insulation Co-ordination

11)Imbalance Factor

12)Minimum Working Clearance

13)Minimum Clearance

14)Transmission of Electricity

15)Distribution of Electricity

16)Connection Point

17)Stand Alone Power Supply Resource

18)High Voltage Providing Electricity

19)Synchronous Operation of Power Systems

20)Interconnection of Power Systems

21)National Grid

As stipulated in Technical Regulation.

22)Area Classification

Polluted environmental area is shown bySite pollution severity (SPS) classes.Definition of SPS is based on the IEC 60815-1.

For the purposes of standardization, five classes of pollutioncharacterizing the site severityare qualitatively defined, from very light pollution to very heavy pollution as follows:

a -Very light b - Light

c - Medium

d - Heavy

e -Very heavy.

The following table gives, for each level of pollution, an example and approximate description of some typical corresponding environments.

For standardization purposes, Relation between surface pollution of insulators and creepage distance for insulators based on the SPS class are specified in the Article 334.

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I. During a storm, the ESDD level at such a distance from the sea may reach a much higher level.

II. The presence of a major city will have an influence over a longer distance, i.e. the distance specified for sea, desert or barren hills.

III. Depending on the topography of the coastal area and the wind intensity.

23)System Diagram

24)System Operational Diagram

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25)Power System Planning

26)Power System Stability

27)Load Stability

28)Steady State Stability of a Power System

29)Transient Stability of a Power System

30)Conditional Stability of a Power System

31)Operation Regulation

32)System Demand Control

33)Management Forecast of a System

34)Reinforcement of a System

35)Cold start-up of a Thermal Generating Set

36)Hot start-up of a Thermal Generating Set

37)Overload Capacity

38)Load Shedding

39)Available Capacity of a Unit (or of a power station)

40)Reserve Power of a Power System

41)Hot Stand-by

42)Cold Reserve

43)Outage Reserve

44)Load Forecast

45)Generation Mix Forecast

46)Steady State of a Power System

47)Transient State of a Power System

48)Balanced State of a Polyphase Network

49)Unbalanced State of a Polyphase Network

50)Service Reliability

51)Service Security

52)Economic Loading Schedule

53)Balancing of a Distribution Network

54)Load Recovery

55)Basic Impulse Insulation Level (BIL)

As stipulated in Technical Regulation.

Article 2. Electrical Equipment

1)Electrical Equipment

2)Location and installation

3)Conductor, Wire, Line and Cable

4)Distribution Line and Transmission Line

5)Busbar

6)Oil-Immersed Electrical Equipment

7)Explosive Resistant Electrical Equipment

8)Electrical Materials

As stipulated in Technical Regulation.

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Article 3. Electrical Facilities

1)Electrical Hall

2)National Load Dispatch Center

3)Gas Insulated Switchgear (GIS)

As stipulated in Technical Regulation.

Article 4. Electrical Systems

1)Energy System

2)Power System

3)Supervisory Control Data Acquisition System (SCADA system)

4)Reactive Power Compensation System

As stipulated in Technical Regulation.

Article 5. Voltage

1)Voltage Level

2)Nominal Voltage of a Power System

3)Operating Voltage in a Power System

4)Highest (or Lowest) Voltage of a Power System

5)Highest Voltage for Equipment

6)Voltage Deviation

7)Voltage Fluctuation

8)Overvoltage

9)LineVoltage Drop

10)Temporary Overvoltage

11)Transient Overvoltage

12)Voltage Surge

13)Voltage Recovery

14)Voltage Unbalance

15)Switching Overvoltage

16)Lightning Overvoltage

17)Resonant Overvoltage

18)Transient Recovery Voltage (TRV)

As stipulated in Technical Regulation.

Chapter 1-2 Definitions of Transmission and Distribution Lines

Article 6. House and Outside Wirings with voltage up to 35kV

1) Applicable Scope for House and Outside Wirings with voltage up to 35kV

Technical words corresponding to house and outside wirings are followings.

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(1) Inlet branch

An inlet branch from overhead power lines to house is a power line connected from overhead power lines to insulators which are installed on outer walls or roofs of buildings or construction structures.

If branches from the overhead power lines into the house are cables, the cables must comply with the requirements for house and outside wirings, branches using the insulated wire or bare conductor must comply with the requirements for overhead power lines.

The requirements of house and outside wirings do not apply to the special line power supply for the electrical equipment.

(2) Support wire

Support wires are support elements such as steel wires for House and outside wirings, and are closely running on walls or ceilings etc., and are used to fix conductors and cables.

(3) Support bar

Support bars are support elements such as metal bars for House and outside wirings, and are closely installed on walls or ceilings etc. to fix conductors and cables.

(4) Box

A box is closed empty structure with rectangular cross-section or other shapes, and is used for installing conductors, cables and electrical instrument in it at indoor or outdoor. Abox has function to protect conductors, cables and electrical instrument from mechanical damage.

A box is one block or with cover for being opened. Walls and covers of a box can be closed or have holes. For once-piece box, its walls shall be closed at all sides and shall not have covers.

(5) Trough

A trough is opened structure, and is used for installing conductors or cables in it at indoor and outdoor. A trough does not have function to protect conductors and cables from mechanical damage. A trough must be made of non-flammable materials. There are kinds of troughs which are closed at all sides or have holes.

(6) The Attic compartment

A roofed compartment is a non-productive compartment at the highest floor of buildings, and the top is a building roof. An Attic compartment is composed of support structures (roof, rafters, bars,beams etc.) made of flammable materials.

Similar compartments which are between walls in buildings or made of non-flammable materials, or technical floor which are under the roof of building, are not considered as an attic compartments.

2)Construction and Category of House and Outside Wirings

Live parts of house and outside wirings are composed byconductors and busbars made of copper, aluminum and aluminum or aluminum alloy with steel reinforced core.

3)Opened and Closed House and Outside Wirings

4)Outdoor and Indoor

5)Extension House and Outside Wirings

As stipulated in Technical Regulation.

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Article 7. Power Cable Lines with Voltage up to 220kV

1)Applicable Scope for Power Cable Lines with Voltage up to 220kV

2)Power Cable Lines

3)Cable Structures

Cable structures are structures designed for installment of cables, cable connection boxes, oil suppliers and other equipments in order to ensure normal operation of power cable lines.

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Cable block (Conduit)

Figure 7-1 (Reference) Cable structures

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4)Cable Channel and Cable Bracket

1.The distance between the power cable with voltage exceeding 1kV and the control cable should be secured at least 100mm or more.

2.The distance between cables should be secured the exceeding distance shown in Table 7.

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5)Safety Corridor for Power Cable Line

Safety corridor of power cable lines is shown in Figure 7-3..

Horizontal distance and vertical distance shall comply withthe values in Table7 in Technical RegulationVol.1.

Figure 7-3 Safety corridor of power cable line

Article 8. Overhead Power Lines with voltage up to 500kV

1)Applicable Scope for Overhead Power Lines with Voltage up to 500kV

2)Limitation of Overhead Power Lines

3)Mechanical Design Condition

4)Densely and Thinly Populated Area s

5)Large Overcrossing Span

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6)Safety Corridor of Overhead Power Lines

Safety corridor of overhead power lines is shown in Figure 8-1, 2.

Horizontal distance and vertical distance shall comply with the values in 8Tablein Technical RegulationVol.1.

Figure 8-1 Safety corridor of overhead power line

Overhead line

For example:

Range trimming trees for OPL-35kV

Trimming Part

Figure 8-2 Safety corridor of tree

Effective preventive measures against the adverse effects of animals and plantsshall be usedfor ensuring a safe distance between trees and overhead power lines.

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The tree pruning shall be done periodically to consider the possibility of development of the tree.

The works in the farms and national parks shall be applied for approval and follow the instructions of the competent authority.

Chapter 1-3 Definitions of Distribution Equipment and

Substations

Article 9. Distribution Equipment

As stipulated in Technical Regulation.

Article 10. Substation

1)Outdoor Substation

2)Indoor Substation

3)Adjoining Substation

4)Workshop Substation

5)fully-equipped substation

6)On-pole Substation

7)Transmission Substation

8)Distribution Substation

As stipulated in Technical Regulation.

Article 11. Switching Station

As stipulated in Technical Regulation.

Article 12. Installation Compartments

As stipulated in Technical Regulation.

Article 13. Safety corridor, operation corridor and explosionexit corridor in the substation

1)Safety corridor

2)Operation corridor

3)Explosion-exit corridor

As for the operation control corridor, detailed provision shall refer to Article 349.

As for the explosion-exit corridor, detailed provision shall refer to Article 349, 350 and 356.

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