Mining transformers


GNAN transformers

Nitrogen filled transformer,Fire-proof, nonpoisonous air created
  • coal mine transformer
  • flameproof substation
  • Flame Proof Mining Substation
  1. coal mine transformer
  2. flameproof substation
  3. Flame Proof Mining Substation

Excellent explosion-proof performance and mechanical strength

Vertically lifted structure adopted

Excellent over-load resistance and insulated performance by using Dupont Nomex paper

Fire-proof, nonpoisonous air created

Low noise


Adopted cyliner-type HV winding to strengthen resistance to over-overltage

Nitrogen filled transformer

Related product parameters

Main Specification
Transformer typedry type
Rated capacityUp to 8000kVA 
Rated voltageUp to 10kV
Insulation classH,C
Cooling modeAN
Zone2 zone
Explosion-proof typeExdIMb
Connection codeYd, Dyn, Yyn etc.
Protection classIP54  IP55

Factory Test

For each transformer are prepared and issued a test report,  except for routine tests, we also offer type tests and specialised tests to meet all customer requirements. We make what matters work for our customers in a safe and reliable way.

 Routine Test

 a) Measurement of winding resistance

 b) Measurement of voltage ratio and check of phase displacement

 c) Measurement of short-circuit impedance and loss

 d) Measurement of no-load loss and current

 e) Dielectric routine tests

 f) Tests on on-load tap-changers, where appropriate

 g) Leak testing with pressure for liquid-immersed transformers(tightness test)

 h) Tightness tests and pressure tests for tanks for gas-filled transformers

 Type Test

 a) Temperature-rise type test

 b) Dielectric type tests

 c) Determination of sound level for each method of cooling for which a guaranteed sound level is specified

 Special Test

 a) Dielectric special tests

 b) Winding hot-spot temperature-rise measurement

 c) Determination of capacitances windings-to-earth, and between windings

 d) Measurement of dissipation factor(tanδ) of the insulation system capacitances

 e) Determination of transient voltage transfer characteristics

 f) Measurement of zero-sequence impedance(s) on three-phase transformers

 g) Short-circuit withstand test


Flame-proof Mobile Substation is designed especially for the environment of methane mixture gas, coal dust and potentially explosive areas. It’s widely used in coal mines, non-ferrous metal mines, tunnel projects etc.
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Tunnel (1).jpg
tunnel enginer.jpg
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Contact us

Varelen Electric Co., Ltd

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