Mining transformers can be installed in places within the mine where there is no explosion risk despite the presence of coal dust and biogas. Mining electric drill transformers and lighting transformers can be installed in places with coal dust, biogas, and explosion hazards in the mine. The former transformer is oil immersed and has the same basic structure as the power transformer. There is no excitation voltage regulation on the primary side, with a voltage regulation range of ± 5%. Six terminals are led out from the secondary winding, and Y and d can be modified to obtain 690V/400V or 1200V/690V. Mining transformers are divided into two types: mining power transformers and mining dry type transformers. Mining power transformers are oil-filled and not flameproof, while mining type transformers are flameproof but not oil-filled. In order to adapt to the working conditions underground, the structural characteristics of mining transformers are mainly reflected in the difference between the oil tank structure and the inlet and outlet devices and ground transformers, and their internal structure is the same as that of ordinary transformers
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
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1. Telephone communication and confirmation of requirements
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1. The testing industry is fully covered, meeting different testing needs
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4. Free initial testing, with no testing fees charged
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6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China