BS 50181:2010 pdf download – Plug-in type bushings above 1 kV up to 52 kV and from 250 A to 2,50 kA for equipment other than liquid filled transformers
1 Scope
This European Standard is applicable to insulated bushings for maximum voltages above 1 kV up to 52 kV,rated currents from 250 A up to 2 500 A and frequencies from 15 Hz up to 60 Hz for equipment other thanliquid filled transformers.
This European Standard establishes essential dimensions,to ensure adequate mounting andinterchangeability of mating plug-in separable connectors of equivalent ratings.
Normative references
The following referenced documents are indispensable for the application of this document.For datedreferences,only the edition cited applies. For undated references,the latest edition of the referenceddocument (including any amendments) applies.
EN 60137,Insulated bushings for alternating voltages above 1 00o v
IEC Guide 109 and Cenelec TC 111X document 1′, Environmental aspects – Inclusion in electrotechnicalproduct standards
NOTE lt is highly recommended to minimize the impact of bushings on the environment during all phases of their life (includingmanufacturing, operation during service life , dismantling after their end of life and disposal or recycling).
IEC Guide109 and document by CENELECTC111X,Environmental standardzation for electrical and electronic products and systemsafter finalization can be used as helpful reference.
Terms and definitions
For the purposes of this document, the following terms and definitions apply.3.1
plug in type bushing
bushing one end of which is immersed in an insulating medium which has customized dimensions accordingto insulation requirements for the specific application and the other end designed to receive a separableinsulated cable connector without which the bushing cannot function
separable connector
fully insulated termination permitting the connection and disconnection of the cable to and from the matingplug-in type bushing
interface type
bushing dimensions that insure mechanical and electrical interchangeability of bushing and separableconnector of similar rating and type
NOTE Each interface type is designed by a letter or a number.
NOTE A bail holder may or may not be an integral part of a bushing and is an optional feature.
Bushings covered by this European Standard shall be suitable for operation with one end connected to aseparable connector and the other end having customized dimensions according to the insulationrequirements for the specific application.
4.2Standard values of maximum voltage (Um)
The value of Um of a bushing shall be chosen from the standard values of the highest voltage for equipment,defined in lEC 60038 as given below in kilovolt:
12 -24-36- 52
4.3Standard values of rated current(,)
The value lr of a bushing shall be chosen from the standard values given below in ampere:
250 – 400 – 630 – 800 – 1 250 – 1 600 – 2 000 – 2 500
Bushings which are supplied separately shall meet the requirements of EN 60137.
Customized bushings which are integrated directly in the equipment shall comply with the test requirementsspecified in the standard(s) relevant to that type of equipment.
4.5Bushing mounting distance
The minimum distance between bushings shall take into account the outer dimensions of separableconnectors and the optional bail holders.
4.6Detail dimensions of plug-in type bushings4.6.1General
The dimensions necessary to ensure adequate mounting and interchangeability of mating plug-in separableconnectors shall be as specified in the following Figures and Tables.
4.6.2outside cone type
The dimensions necessary for outside cone plug-in type bushings are specified in Figures 1 and 2 and inTables 1 and 2.