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HM launched its first SF6 Gas Insulated Vacuum OLTC in 2014 with the world highest voltage level

Date: 2017-09-27
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Concerning the continuous increasing power consumption in urban areas, a great number of substations have been constructed underground, beneath commercial buildings, parks and public spaces. In this case, gas insulated transformers offer the best solution due to their outstanding non-flammability and insulating efficiency. As the most crucial part of transformers, gas Insulated vacuum OLTCs were born accordingly.

 

Boasting a professional and experienced design team, HM launched its first SF6 Gas Insulated Vacuum OLTC (Type: SHGVIII) successfully in 2014 and became a leader ofGas Insulated Vacuum OLTCs with the highest voltage level. 


HM launched its first SF6 Gas Insulated Vacuum OLTC in 2014 with the world highest voltage level


Diverter Switch

l  Use Vacuum interrupter (EATON, USA) to extinguish arc.

l  The energy accumulation mechanism adopts the “over-dead–point” release principle, and all moving parts are rolling friction.

l  Take the heat dissipation problem of transition resistance into consideration and reduce the transition resistance flow density.


Tap Selector

l  Use the mature overall structure of CMD selector.

l  All the contacts are designed as rolling structures.

 

Advantages of HM SF6 Gas Insulated Vacuum OLTC

l  Non-flammability

l  Easy inspection and less maintenance work


HM launched its first SF6 Gas Insulated Vacuum OLTC in 2014 with the world highest voltage level 

Transformer SQFPZ11-63000/220±8*1.25%& SHGVIII-400Y/126C-10193G

 

The SF6 Gas Insulated Vacuum OLTC passes all  type tests as below in accordance with the requirements of IEC-60214-1 tap-changer Part 1: performance requirements and test methods.

 

1. OLTC functional test

2. OLTC Mechanical test

3. Contact temperature-rise test

4. Switching test

5. Short-circuit current test

6. Transition impedance test

7. Insulation test


On 21 July 2016, Power Grid Planning Research Center of Shenzhen Power Supply Bureau Co., Ltd issued a Statement to HM and certified the SF6 Gas Insulated Vacuum OLTC produced by HM operates very well at the 220V Yulv Substation in Qianhai, Shenzhen without any failure since commissioning.


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