MV Switchgear-IEC

Medium Voltage Switchgear IEC standard

We provide IEC (International Electrotechnical Commission, European standard)  type tested medium voltage switchgear from 2 manufacturers. One is GE Secogear from Shanghai, China and the other is Siemens from either Jarkata, Indonesia or from Thailand. There can be air insulated switchgear (AIS) using air as insulation medium for all the busbars and MV components (like CTs, PTs, support insulator, earthing switch) or can be gas insulated switchgear (GIS) using SF6 gas as insulation for all busbars and MV components. There is also the option for better environment we culd use 50% SF6 + 50% N2. This latter can also devided as per the light duty (we call Ring Main Unit) and heavy duty (we call Gas Insulated switchgear GIS). The circuit breaker is vacuum type circuit breaker that use vacuum as a switching medium.

The switchgear can be equipped with any protection relays from any maker, like GE Multilin, Siemens Siprotec, Alstom and etc. The switchgear can be equiped with arc protection devices like VAMP or ABB. The Substation control system can also implement in the switchgear using intelligent relay protection set. The switchgear can also be equiped with special windows for Thermal image scanner to check the fit busbar connections.

We will do all the design work i.e. single line diagram, foundation layout, panel layout, schematic diagram, wiring terminal list. we can also do relay setting coordination study providing that the network data received from the customer.

After delivery, we could provide installation and commissioning for them. The standard warranty is 1 year with the option to extend it to 3 years.

We have experiences working with the sophisticated consultant like Foster Wheeler, Technip and etc. the documentation required is not concern us.

The rating of the IEC standard switchgear are as follows;

Technical Rating AIS GIS
Rated Voltage 3.3-45kV 3.3-45kV
Rated Current 630-4000A 200-4000A
Rated short circuit current 25kA-50kA, 1or3sec. 16kA-40kA, 1or3 sec.
Internal Arc rating 25kA,31.5kA, 40kA 1 sec 16kA, 25kA, 31.5kA, 40kA 1sec

The rating that is rarely find from the market is 24kV and 31.5kA can be quoted by us.

 We could also provide medium voltage switchegear with marine certificate.

For Ring Main unit we could provide 630A 36kV rating.


 The gas insulated switchgear can be IEC or GB standard





credit: General Electric MV switchgear, Siemens MV switchgear