IS 15652/11171/1445/1678

Abstract of IS: 15652

Insulating Rubber Mat

  •  Four classes of mats, covered under this standard nd differing in electrical characteristics for different use voltages are designated
Class A       AC (Rms)KV=3.3      DC(V)  =240  Thickness =2.0mm
Class B       AC (Rms)KV=11      DC(V)  =240  Thickness =2.5mm
Class C       AC (Rms)KV=33   DC(V)  =240  Thickness =3.0mm
Class D       AC (Rms)KV=66      DC(V)  =240  Thickness =3.5mm
  • Most of all classes hall be resistant to acid and oil and low temperature and shall be identified by the respective class symbol. However a category with special property of resistance to extreme ‘low’  ternperature will be identified by a subscript’s ‘to, the ‘respective “c” Class symbol.
  • Roll of Mat shall be in multiple Length of of 5000mm and ion width of 1000mm.Standard Shape in length of 1000, 2000, 3000mm.
  • Leakage  current for all Class of Mat shall not be more than 10 Micro Amp.
  • In Case of Mat in Roll It shall be min 1m X 1m.

Abstract of IS: 11171

Transformer Cooling Method indication

  • Type of cooling Medium: A=Air, G=Gas. Type of Circulation : N=Natural, F=Forced
  • First Letter= Type of Cooling Medium (Contact with Winding),
  • Second Letter = Kind of Circulation(Contact with Winding),
  • Third Letter= Type of Cooling Medium (Contact with external cooling System),
  • Forth Letter = Kind of Circulation (Contact with external cooling System),

Transformer Temperature Rise Limit

Part  Type of Insulation    Degree (Centigrade) 
Part=Winding        Type of Insulation=A   50 Centigrade
Part=Winding        Type of Insulation=E  65 Centigrade
Part=Winding        Type of Insulation=B  70 Centigrade
Part=Winding        Type of Insulation=F  90 Centigrade
Part=Winding        Type of Insulation=H  115 Centigrade
Part=Winding        Type of Insulation=G  140 Centigrade
Part= Core, Metallic Part   Type of Insulation=-  Not rise to damage core or metallic part

Transformer Reduce Temperature Rise Limit

  • TRANSFORMER designed for operation at an altitude greater than 1 000 m but tested at normal altitudes  the limits of temperature rise are reduced by the following amounts for each 500 m by which the intended working altitude exceeds 1000Meter
  • ( a) Natural-air-cooled Transformers 2.5 %  (b) Forced-air-cooled Transformers %

Transformer Parallel operation Condition

  • (1 )Rated power ( kVA );
  • (2) Rated voltage ratio;
  • (3) Voltage ratios corresponding to tappings other than the principal tapping.
  • (4) Rated power ( kVA ); Rated voltage ratio; Voltage ratios corresponding to tappings other than the principal tapping.
  •  (5) Load loss at rated current on the principal tapping, corrected to the appropriate reference temperature.
  •  (6) Impedance voltage at rated current ( on the principal tapping ).
  • (7) Short-circuit impedances, at least on the extreme tappings, if the tapping. Range of the tapped winding exceeds + or – 5 %.

Abstract of IS: 1678

PCC Pole:

Class of Pole Length of Pole Min Ultimate Transverse Load
Class 1 17 Meter 3000 Kg
Class 2 17 Meter 2300 Kg
Class 3 17 Meter 1800 Kg
Class 4 17 Meter 1400 Kg
Class 5 16 Meter 1100 Kg
Class 6 12.5 Meter 1000 Kg
Class 7 12 Meter 800 Kg
Class 8 12 Meter 700 Kg
Class 9 11Meter 450 Kg
Class 10 9 Meter 300 Kg
Class 11 7.5Meter 200 Kg

PCC Pole Tolerance

  • Tolerance: The tolerance of overall length of the poles shall be + 15 mm.
  • The tolerance on cross-sectional dimensions shall be + 3 mm.
  •  The tolerance on cross-sectional dimensions shall be + 3 mm.
  • The tolerance on uprightness of the pole shall be 0.5 per cent

PCC Pole depth in Ground:

Length of Pole Min depth in ground
6 Meter To 7.5 Meter 1.2 Meter
8 Meter To 9 Meter 1.5 Meter
9.5 Meter To 11 Meter 1.8 Meter
11.5 Meter To 13 Meter 2.0 Meter
13.5 Meter To 14.5 Meter 2.2 Meter
15 Meter To 16.5 Meter 2.3 Meter
17 Meter 2.4 Meter

Abstract of IS: 1445

Porcelain Insulator

  • Overhead line insulators are divided into two types according to their construction.
  • Type A- An insulator unit in which the lengths of the shortest puncture patch through solid insulating material is at least equal to half the length of the shortest flash over path through air outside the insulator.
  • Type B- An insulator or an insulator unit in which the length of the shortest puncture patch through solid insulating material is less than half the length of the shortest flash over path through air outside the insulator

 

3 Responses to IS 15652/11171/1445/1678

  1. Yogesh Shukla says:

    Provided information in very useful.

  2. can you upload ASTM D147 Safety Standard…

  3. Sandeep Singh says:

    Dear sir i would like ask you one thing that is insulation mat put in rear side of electrical panel is that true and not and which rule of ISI.

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