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Quality Assurance

  We have more than 20 years’ experience in designing and manufacturing these equipment, so our equipment is stable, reliable, with high quality and good reputation.

  All the products have been run well and adjusted to good condition before delivery, operator only need to follow the user manual to operate it.

Technical Support

  Our technical team supports our customers at all time with our long experience, expert advice and the unlimited spirit to always providing the best customer service.

  You can arrange your engineer to our company to get free training. If necessary, we can also arrange our engineer to your company for training and commissioning at your cost.


  Provide professional advice and reasonable offers within 2 hours at working time, and within 12 hours at non-working time.

  One year warranty for all the products, life time technical consulting, life time provision of spare parts, free software upgrades.


Chongqing Gold Mechanical&Electrical Equipment Co.,Ltd.  mainly design and manufacture the electrical testing equipment and oil purifier for more than 20 years, and we have much experience of exporting since 2008.

After several years’ development, our products have become high intelligent and wide coverage. And our company has become one of the leading manufacturer of electrical testing equipment and oil purifier in China.


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We have persisted on the business idea of "Integrity Basis and Quality First" for the stable and constant development. We are making effort to develop together with customers from both domestic and abroad on the basis of reciprocity.


  • Why do we use ultra-low frequency test instead of power frequency withstand voltage test?

    The ultra-low frequency insulation withstand voltage test is actually an alternative method of the power frequency withstand voltage test. We know that when power frequency withstand voltage tests are performed on large generators, cables and other test products, due to their insulation layer presents a large capacitance, we need a large-capacity test transformer or resonant transformer to complete the testing. Such huge equipment is not only cumbersome and expensive, but also very inconvenient to use. In order to solve this contradiction, the electric power department adopted to reduce the test frequency, thereby reducing the capacity of the test power supply.
    Through many years of theory and practice at home and abroad, it has been proved that using 0.1Hz ultra-low frequency withstand voltage test instead of power frequency withstand voltage test can not only have the same equivalence, but also greatly reduce the volume and weight of the equipment, and the theoretical capacity is about one-fifth of the power frequency. The test procedure is greatly reduced, and it has more advantages compared with the power frequency test.
  • What are the factors that affect the insulation strength of SF6 gas?

    There are the following factors influencing the insulation strength of SF6 gas.
    1. The effect of uniform electric field performance. Under a uniform electric field, the insulation strength increases linearly with the distance between the contacts. If the distance is too large, duo to the uneven state of the electric filed, the insulation strength increases and saturation occurs. Under an uneven electric field, its insulation strength will even approach the air level.
    2. The relationship with stress. The insulation strength increases with the increase of gas pressure. Under the more uniform electric field, the insulation strength is affected by the thickness of vessel wall and the volume of components inside the equipment.Don't raise the gas pressure too high.Generally at 20℃, the pressure of SF6 gas chamber is 0.3~ 0.6mpa, and that of SF6 arcing chamber is 0.5~ 0.7mpa.
    3. Influence of electrode surface state. Generally, the rougher the electrode surface, the lower the breakdown voltage.The greater the electrode area is, the greater the probability of the occurrence of accidental factors will be, thus reducing the breakdown voltage
    Influence of voltage polarity. As the insulation structure of SF6 circuit breaker is in the form of slightly uneven electric field, the insulation level is often determined by the complex polarity voltage.
  • Why we need GDRZ-902 Transformer SFRA

    After the transformer is designed and manufactured, its coil and internal structure are determined. Therefore, for a multi-winding transformer coil, if the voltage level is the same and the winding method is the same, the corresponding parameters (Ci, Li) of each coil should be Is ok. Therefore, the frequency domain characteristic response of each coil is also determined accordingly, and the frequency spectrum of the corresponding three-phase coils is comparable.


    Transformer is an indispensable important instrument in power system. During transformer repair or transportation, transformer winding may be deformed. At the same time, inter-turn and inter-phase short circuit may also occur during the test of transformer. The transformer winding deformation tester is mainly used to measure various parameters of the transformer internal winding. After obtaining various accurate measurement data, the computer system compares and analyzes it to make judgments on the internal fault state of the transformer.

  • What kind of certificate can you provide?

    We can provide CE mark,ISO 9001 quality certificate, the third party calibration certificate(CNAS),factory test report.
  • What's the delivery lead time?

    For most of the products, delivery lead time is 10 days after the order is confirmed; For some customized products, please check with the sales person.
  • What's the payment term?

    For total amount below USD3,000.0, payment term is 100% T/T as deposit; For total amount above USD3,000.0, payment term is 30% T/T as deposit, the balance before delivery; The payment term is also negotiable.



Tel : 0086-23-62613622
Phone : +86 15123029885
Add : 25F, Huarun Center, Xiejiawan Street, Jiulongpo District, Chongqing, China, 400050
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