VOLTAGE STANDARD

Statutory Limits as per section of IE Rules 1956 and as per IEGC

AS PER IE RULE 1956 AS PER IEGC

Title International Standards

Structural steel (standard quality)

hardening and low heat Portland cement of steel wires

ISO 6892-1984

3. Is 383-1970

Course and fine

aggregates from natural sources for concrete

CSA

transmission Purposes

ICE 1089-1991

Aluminum conductor galvanized steel reinforced line towers and poles.

c)IS 398-1982

Part-IV

Aluminum alloy standard conductor reinforced for extra high voltage (400 KV and above

Code of practice for plain and reinforced concrete

ISO 3893-977 1985(Part

-III/Sec.2) -1989 7. IS

731-1971

Porcelain insulators for overhead power lines with nominal voltage greater than 1000 volts.

BS 137-1982 bolts for steel structure

I/Sec.II)-Code of practice for use of structural steel in overhead transmission line : materials, loads and permissible

Coating of zinc coated iron and steel articles.

ASTM A90 ISO 1460

1992 Is 1363 Hexagonal head bolts, screws and nuts of product Grade – C b. IS

802-1978 (Part-II)

Code of practice for use of strut, steel in

overhead trans. line Fabrication, coating of zinc coated .

Code of practice for use of strut. steel in

overhead trans. line towers: testing.

ANSI/ASCE

Reels and drums for bare conductors

BS 1559-1949 26. Part III Mechanical properties and test methods for bolts, screws and stud studs with fully load

Criteria of earthquake resistant design of structures.

IEEE 693 27 Part VI Mechanical properties and test methods for nuts with full load ability

ISO/DIS

IS 2121 Specification for conductor and earth wire accessories for overhead power lines.

ISO/R

Part-I 1981 Armour rods, binding wires and tapes for conductors.

30. IS 1888-1982

Method of load test on soils 13

b)

Part-II 1981

Mid span joints and repair sleeve for conductors.

Accessories for earth wire

31 IS 2629-1966

Recommended practice for hot dip galvanizing

Non extension joints IS

14000-1994

14 .

IS 2486 Specification for insulator fittings for overhead power lines with nominal volt age greater than 1000V

33. IS 2131 Part-I General requirements

and tests Part-II Dimensional

requirements

IEC 120- 1984 Part-III Locking devices IEC 372-1984

B) POWER TRANSFORMERS Sl

Electro technical Vocabulary of Transformer

7 IS 6600 /1972

Guide for loading of Oil immersed Transformer 2 IS 2026

(Pt 1)1977

Power Transformer - General 8 IS

10561/1983

Application Guide for power transformers

Dry type Transformer

4 IS 2026 ( Pt 3 )1981

Power Transformer – Insulation Level &

Dielectric Test

10 IS 10028 ( Pt 1 ) 1985

Code of practice for insulation and

Power Transformer – Terminal Marking, tapping & connection

11 IS 10028

Transformer/ Reactor bushings Min.

Clearance in air specification

12 IS 10028

C) INSTRUMENT TRANSFORMER 1 IS 1885(

Pt-28 ) 1993

Electro technical Vocabulary of instrument Transformer

7 IS 3156 ( Pt 2 )1992

Voltage Transformer – Measuring VT

2 IS 2705 ( Pt 1 )1992

Current Transformer – General Requirement

8 IS 3156 ( Pt 3 ) 1992

Voltage Transformer – Protection VT

3 IS 2705 ( Pt 2 )1992

Current Transformer – Measuring CT 9 IS 3156 ( Pt 4 ) 1992

Voltage Transformer – Capacitive VT

4 IS 2705 ( Pt 3 )1992

Current Transformer – Protective CT 10 IS 4146 1983

Application Guide for VT

5 IS 2705 ( Pt 4 )1992

Current Transformer – Protective CT Special purpose

11 Is 4201/1983 Application Guide for CT

6 IS 3156 ( Pt 1 ) 1992

Voltage Transformer – General Requirement

12 IS 5547 /1983

Application Guide for Capacitive Voltage transformers

D ) CIRCUIT BREAKERS 1 IEC 56

:1987/IS 13118:199 1

High Voltage AC Circuit Breaker 7 IS 2516 ( Pt-1 / SecPt-1 ) Pt 1 & 2 / Sec 1 ) :1985

Circuit Breakers Pt 1 & 2 requirements and tests.

Section 1 Voltages not exceeding 1000 V AC or 1200 V DC

2 IEC- 376:1971/

IS 13072 :1992

Specification and acceptance of New SF6 8 IS 12729 /1988

General Requirement s for Switchgear and Control gear exceeding 1000 V AC

3 IEC –427 : 1973/ IS 13516 :1993

Report on Synthetic Testing of High Voltage AC Circuit Breaker

9 IS 7567 : 1982

Specification for Automatic reclosing circuit breakers for AC distribution

4 IEC- 694 :1980

Common clauses for HV Control gears 10 IS 9135:

1979

Guide for Testing of Circuit Breaker with respect to our phase switching

5 IS 1885 ( Pt 17 ) / 1979

Electro technical Vocabulary of – Switchgear and Control gear

11 IS 10118 ( Pt 1 to 4 :1982

Code of practice for installation and maintenance of

Switchgear and Control gear.

6 IS 12032 ( Pt –7 ) /1987

Graphical Symbol for diagrams in the field of Electro technology. Pt-7 Switch gear , control gears and protective Devices against water by Ring method

2 IS 1448 ( PT –10 ) 1970

Test Method for petroleum products by cloud point and pour point .

11 IS 6262 :1971

Test method for power factor and Dielectric Constant of insulating materials

3 IS 1448 ( PT –16 ) 1970

Density of Crude petroleum liquid petroleum products by Hydrometer Method

12 IS

6792:1992

Method of Determination of Electric Strength

4 IS 1448 ( PT –21 ) 1970

Flash point by DENSKY – MARTENS apparatus

13 IS 6855 :1973

Method of sampling for liquid Dielectric.

5 IS 1448 ( PT – 25 ) 1970

Determination of Kinematics and Dynamic Viscosity

14 IS 9434 :1992

Guide for sampling and analysis of free and dissolved gasses and oil from oil filled equipment.

6 IS 1886 :1983

Code of practice for maintenance and Supervision of oil in Service

15 IS 10593 :1992

Method of evaluating analysis of free and dissolved gasses and oil from oil filled equipment.

7 IS

6103:1971

Test method of Sp. Resistance 16 IS 13567 :1992

Water in insulating liquids and in oil impregnated paper and press board by automatic coulomatric Karl Fisher titration method

8 IS 12463 :1988

Inhibited Mineral Insulating oil 17 IS 13631 :1992

Method of Test for Determination of antioxidant additives in insulating oil

9 IS 2362 : 1973

Determination of Water content by Karl- Fisher Method

18 IS 12177:

1987

Method of test for oxidative ageing of electrical insulation of petroleum oils by open beaker method

F) ISOLATORS 1 IEC 129 AC Current Isolators ( Disconnectors and

Earth Switches

4 IS : 3921 Pt –3 /1982

AC Current Isolators ( Disconnectors and Earth Switches FOR voltages above 1KV (General &Definitions) Construction

2. IS : 3921 Pt –1 /1981

AC Current Isolators ( Disconnectors and Earth Switches FOR voltages above 1KV (General &Definitions

-do- Information for Tender Order & Inquires G) SURGE ARRESTERS

1

IEC: 99-4 Specification for Surge Arresters without gap for AC System

3 IEC 270 Partial Discharge Measurement 2 IEC: 99-1 Non Linear Resistor type gapped arresters

for AC Systems

4 IS : 3070 (Pt-3 ) / 1993

LA for AC Systems Specification for Metal Oxide LA without gap. )

11. 4. EXTRACTS FROM INDIAN ELECTRICITY RULES 1956

RULES TITLE RULES TITLE

2 (av ) Definition of Voltage 76 Max. Stresses and Factor of Safety in Overhead lines

50 Supply and Use of Energy 77 Clearance above ground of the lowest Conductor

54 Declared Voltage of Supply to Consumer

79 Clearances from buildings of low and medium Voltage lines and Service Line

55 Declared Frequency of Supply to Consumer

80 Clearances from buildings for HT, EHT lines

56 Sealing of Meters and Cut-outs 83 General Clearances 57 Meters, Maximum Demand Indicators

and other apparatus on Consumers’

premises

84 Routes, Proximity to Aerodrome

58 Point of Commencement of Supply 85 Max. Interval between supports 74 Materials and Strength in Over head

lines

87 Line Crossing or Approaching each other

75 Joints in Overhead lines

12 DATA ON POWER TELECOMMUNICATION

12. 1. PLCC TECHNICAL DATA (NOMINAL VALUE)

Sl.No. DATA VALUE

1 DC Supply required for Carrier Set 48 V 2 AC Current required for single

Carrier

1 A 3 Characteristic Impendance of

Co-axial cable

75/125 ohm 4 Capacitance of CC/CVT 4400pF (220 KV)

5575/6000 Pf ( 132 KV ) 5 Inductance of Wave trap 0.5 mH (132 KV)

1 mH ( 220 KV ) 6 Line Current Capacity of Wave

trap

630/800/1200 A 7 Nominal Tx at Co-axial

termination ( By SLM ) #

+ 4 to +12 dBM

8 Nominal Tx at Co-axial termination

( By SLM ) #

-26 to 0 dBM

# Measurement Procedure :- Tune SLM to Tx/Rx frequency + Pilot frequency of that carrier type ¥

Local loop :- Using dummy load in place of hybrid print local Tx/Rx can be looped back for ensuring healthiness of local carrier set

¥ Different Types of Carrier and Pilot frequency

Sl. No. Carrier Type Frequency ( Hz )

1 ETI 3600

2 ETL 3780

3 BPL 3570

4 PUNCOM 3923

12. 3. Power Allocation to speech and VFT channel

AF Signal Signal levels Absolute Voltage levels at the test sockets TXAF (-10dBr) dBmO Weighti

ng

dBu Speech test tone 800

Hz Internal test tone 1000 Hz

0 1.0 -10

Speech with safety margin

+3 1.41 -7

VFT channels and modems

50Bd -14 0.2 -24

100Bd -11 0.28 -21

200Bd -8 0.4 -18

600Bd -3 0.71 -13

1200Bd,V.23 0 1.0 -10

1200Bd+speech -3 0.71 -13

2400Bd 0 1.0 -10

Max. permissible load with speech plus superimposed channels

+10.8 3.48 +0.8

Pilot tone -6 0.5 -16

12.2 TELEPORTATION BASIC SYSTEM

Interface 1: - Wetted contact/relay

Interface 2: - Voice frequency => “analog channel”

- Digital data => “digital channel”

Interface 2 Interface 1

Protection Relay

Teleprotection equipment

Protection Relay Teleprotection equipment

Telecommunication system physical

link

Teleprotection system

Interface 2 Interface 1

In document Electrical Data (Page 106-115)