Electrical Equipment Code - Kostt

1 Electrical Equipment Code Prishtina July 2007 TABLE OF CONTENTS 0 Preface to this version of the Electrical Equipment Code .. 1 1 Introduction .. 1 2 Glossary and Definitions .. 2 3 Service Conditions .. 5 General .. 5 Normal Current Ratings of Equipment .. 5 Normal Service Conditions .. 5 Indoor Plant .. 6 Outdoor Plant .. 6 Protection and Control Equipment Operating 6 Fault Clearance .. 7 Multi-pole Opening/Tripping and Auto-reclosing .. 8 Special Service 8 4 Substations .. 10 Technical Requirements for Substations Connected to the Transmission System.

2 10 General 10 Designing For Safety .. 10 Legal 11 Environmental Impact .. 11 Design Life of Installations .. 11 Operational 11 Maintenance Requirements .. 11 Interlocking .. 12 Current Transformers .. 12 Switchgear Secondary Isolation .. 12 Voltage Transformer Secondary Isolation .. 12 Earthing .. 12 Equipment Identification .. 12 Secondary Equipment .. 13 Substation Auxiliary Cabling .. 14 Electrical Equipment Code i Segregation of Equipment owned by TSMO and System Users .. 14 Lifting Equipment .

3 15 Substation Facilities .. 15 Site 16 Fire Protection .. 16 Disturbance Recorder .. 16 General Requirements Applicable to AIS Substations .. 16 Electrical Clearances .. 16 Safety Clearances/Distances .. 17 Clearances to Perimeter 18 Clearance to Roadways .. 18 Substation Profile .. 19 Earthing Devices .. 19 Portable Earthing .. 20 General Requirements applicable to GIS 20 20 AIS Connections .. 20 Portable Maintenance Earthing Devices (PMEDs) .. 20 Gas service connections .. 21 Pressure/Density Indication.

4 21 SF6 Gas Alarm Scheme .. 21 Location of Light Current 21 Performance Requirements for all Switchgear .. 21 Jointing of Current Carrying Conductors .. 21 Primary 21 Routine Tests at Site .. 22 Current Carrying Conductors .. 22 Conductor Jointing in Substations .. 22 Introduction to Conductor Jointing .. 22 Jointing 22 Preparation of Unplated/Untinned Surfaces of Bolted Joints .. 23 Preparation of Tinned or Plated Surfaces of Bolted Joints .. 23 Assembly of Bolted Joints .. 24 Service Performance of Bolted Joints.

5 24 Gas Shielded Electric Arc Welded Joints (MIG TIG).. 24 Electrical Equipment Code ii Fusion Electric Arc Welding, Gas Brazing and High Temperature Soldering25 Explosive Jointing / Cold Pressure 25 Compression 25 5 Switchgear .. 26 General Technical Requirements .. 26 Compressed Gas .. 26 Operating Mechanisms and 27 Outage Constraints .. 27 Technical Requirements for Gas Insulated Switchgear .. 27 SF6 Gas Service Connections .. 28 Partial Discharge Measurement .. 29 Performance Requirements.

6 30 Sulphur Hexafluoride Gas (SF6) .. 31 6 Circuit 31 General 32 General Requirements for Circuit breakers .. 32 General Requirements for Mechanisms and Stored Energy Systems .. 33 General Requirements for Control Schemes and Circuitry .. 34 Additional General Requirements for Special Purpose Circuit breakers for Capacitor Bank Switching .. 36 Additional General Requirements for Special Purpose Circuit breakers for Shunt Reactor Switching .. 36 Performance Requirements .. 36 Performance Requirements for Special Purpose Circuit breakers for Capacitor Bank 37 7 Disconnectors and Earthing Switches.

7 38 Rated Short-Time Withstand Current .. 38 Divided Frame Disconnectors and Earthing 38 Bus-transfer Duty .. 38 Rated Values of Mechanical Endurance for Disconnectors .. 39 Rated Values of Electrical Endurance for Earth 39 General Requirements for Disconnectors and Earth 39 Clearance Distances .. 39 Simultaneous Operation of Poles .. 39 Electrical Equipment Code iii Flexibility of Design and Setting Adjustment 39 Position Indication .. 39 Mechanical Key 40 GIS Combined Disconnectors and Earthing Switches.

8 40 Drive System Mechanical Interference 40 'Lockout' Interlock Keys .. 41 Earthing Switch Magnetic Bolt 41 Operations 41 Construction Materials and Protective Coatings .. 41 Operating Mechanisms, Ancillary Equipment and their Enclosures .. 41 'Sealing In' of Control 41 Drive Limit Switch .. 41 Control Switches .. 42 Auxiliary Switches .. 42 8 Substation Interlocking Schemes .. 42 General 42 Mechanical Interlocking .. 44 Performance Requirements .. 44 9 Solid Core Post Insulators for Substations .. 44 Type Tests.

9 44 Routine Testing .. 45 10 Bushings .. 45 General 45 Performance Requirements .. 45 Type Test Requirements .. 46 Routine Test Requirements .. 46 11 Surge Arresters .. 47 General requirements for all Surge Arresters .. 47 Air Insulated Surge Arresters .. 47 Gas Insulated Surge Arresters .. 48 Functional and Performance Requirements .. 48 Type Tests .. 49 Electrical Equipment Code iv Routine 49 Commissioning Tests .. 50 Condition Monitoring and Maintenance .. 50 12 Measurement Transformers.

10 50 Current Transformers .. 51 Type Tests .. 54 Routine Tests .. 54 Routine Test Reports .. 55 Voltage Transformers .. 56 Performance Requirements of VTs .. 56 Type Tests .. 58 Routine Tests .. 59 Routine Test Reports .. 59 13 60 Rise of Earth Potential .. 61 Earth 63 Earth Electrode 64 Test Facilities .. 64 Equipment Connected to the Main earth system .. 65 Installation .. 66 Portable Earthing .. 66 Steel Support Structures .. 67 Fences .. 67 Access/Egress Gates .. 68 Temporary Fences .. 69 Terminal Towers.