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Dry Type Mining Explosion-Proof Transformer has obtained multiple certifications and its product quality is favored by customers.

If your order quantity is large, we can customize the certificate for you need certificate.

Transformers Cores Matericals,we can customized two kinds of : Amorphous Alloy Cores or Silicon Steel Cores.

Power Transformers Coil Matericals,we also can customized two kinds of : Copper Coil or Aluminum Coil.
There are more technologies to meet your needs.
I hope recive you massage.

Why i can say this information about custom Power transformer,Distribution transformer,Subtation transformer,Special transformer?

Because our factoy have more than 300 engineering and technical personnel,more than 1200 employees,covering an area of 240000 square meters.
Of course, our prices are reasonable and cheap, guaranteed to fit your purchasing plan.Dont't worry you plan.
We very much welcome all future partners to visit our factory and office.

Believe in the quality of our products.
Our products are mainly supplied to large national enterprises in China: State Grid, China Southern Power Grid,  China Railway, various types of hydropower stations, wind power stations, photovoltaic power stations, etc. Customers can be assured of product quality.
We also cooperate with large companies abroad. For example, ENERGOMAX LLC, GREENS LTD, UZTRANSFORMERLLC, Meta Power Solutions,CENTURY ENGINEERING CONTRACTOR LTD.,MALAYSIA PHASE 2 POWER STATION PROJECT,ETC.

Underground mining transformers can be divided into two types of transformers based on usage scenarios.
One is a universal transformer. The other is a mine explosion-proof transformer.
Generally, general-purpose transformers are oil-immersed transformers, which are mainly used in places where there is coal dust and methane, but there is no danger of explosion, for power lighting and power drag. The interior is the same as that of a normally used oil-immersed transformer. The main difference between the two is the outer casing and the incoming and outgoing wire devices.
Explosionproof transformers are mainly dry-type transformers, which are mainly used in mines where there is a risk of explosion. There are production requirements for its box shell and conductor lines.

Dry type ining transformer structure

Shell: It adopts a fully corrugated structure and is made of welded steel plates. It has the characteristics of high mechanical strength, low temperature rise and good heat dissipation effect. Can withstand internal pressure of 1.0 MPa.
The box cover is made of steel plate, with two cable outlet sleeves on it. Rubber gaskets are placed on the inside of the outlet sleeves. The cable passes through the rubber gasket. After tightening the coil, the rubber gasket can be used to compress the cable to ensure sealing. The selected cable outer diameter, it must fit closely with the rubber gasket to ensure that the cable can be compressed and completely sealed to ensure performance.

Internal dry-type transformer: Class H insulation.The low-voltage winding adopts a cylindrical structure wound with copper foil, and the high-voltage winding adopts a segmented multi-layer cylindrical structure, which is vacuum-impregnated and baked at high temperature to achieve balanced ampere-turn distribution and low magnetic flux leakage. Small, high mechanical strength, good heat dissipation conditions, strong short circuit resistance and low noise.
The low-voltage winding adopts a cylindrical structure wound with copper foil, and the high-voltage winding adopts a segmented multi-layer cylindrical structure, which is vacuum-impregnated and baked at high temperature to achieve balanced ampere-turn distribution, small magnetic leakage and high mechanical strength. , good heat dissipation conditions, strong short-circuit resistance and low noise.
A low-noise air-cooling device can be configured, and the start-up and shut-down of the fan can be automatically controlled by the thermostat, thus allowing the transformer to operate with a 40% increase in capacity.
Through the temperature sensing element and sensing system embedded in the low-voltage winding, the fan can be started and shut down or alarmed and tripped according to the set value to protect the transformer.
The dry-type transformer is equipped with IP20 to prevent foreign objects with a diameter >12mm from entering the casing. The dry-type transformer is equipped with IP23, which can also prevent water at an angle of <60° from the vertical from entering. The protective cover can effectively prevent accidents such as short circuits and power outages caused by small animals entering the cover, and also ensures personal safety.
The low-voltage side of the mining transformer allows "Y"-shaped connection to provide 690-volt power supply, or it can be changed to form-connection to provide 400-volt power supply. Six porcelain sleeves are directly led out of the secondary end in the cable junction box for user modification.
The insulation system of KBSGZY series mining explosion-proof power transformers is based on DuPont Nomex paper technology and has high safety performance.

In order to ensure the normal operation and safe use of mining transformers, a series of protection measures are required.
1. Overload protection: When the load of the mining transformer exceeds its rated capacity, the overload protection device will automatically cut off the power supply to prevent the transformer from being damaged due to overload. Overload protection is usually implemented using thermal relays or electronic overload protectors.
2. Short circuit protection: When a short circuit occurs at the output end of the mining transformer, the short circuit protection device will quickly cut off the power supply to protect the transformer from damage due to the impact of short circuit current. Short circuit protection is usually implemented using electromagnetic or electronic short circuit protectors.
3. Leakage protection: During the operation of the mining transformer, leakage may occur due to insulation aging, environmental humidity and other reasons. The leakage protection device can detect the leakage current and cut off the power supply in time to ensure the safety of people and equipment. Leakage protection is usually implemented using a residual current device (RCD).
4. Temperature protection: Mining transformers will generate a certain amount of heat during operation. When the temperature of the transformer exceeds its rated value, the temperature protection device will send out an alarm signal and take corresponding cooling measures to prevent the transformer from being damaged due to overheating. Temperature protection is usually implemented using temperature sensors and thermostats.
5. Oil level protection: Mining transformers are equipped with insulating oil for cooling and insulation. The oil level protection device can monitor the oil level inside the transformer in real time and send an alarm signal when the oil level is too low to ensure the normal operation of the transformer. Oil level protection is usually achieved using a float-type oil level gauge.
6. Gas protection: During the operation of mining transformers, there may be a risk of gas explosion due to gas leakage and other reasons. The gas protection device can detect the gas concentration and cut off the power supply in time to prevent gas explosion accidents. Gas protection is usually implemented using gas sensors and gas controllers.
7. Mechanical protection: During the operation of the mining transformer, the mechanical structure may be damaged due to vibration, impact, etc. The mechanical protection device can detect abnormal vibration and impact and take corresponding protective measures to ensure the normal operation of the transformer. Machinery protection is usually implemented using vibration sensors and vibration controllers.
In short, the protection content of mining transformers covers many aspects such as overload, short circuit, leakage, temperature, oil level, gas and machinery, etc., aiming to ensure the normal operation and safe use of the transformer. During actual operation, mining transformers also need to be inspected and maintained regularly to discover and deal with potential safety hazards in a timely manner.
Service Conditions

A. Altitude shall not be over 1500m

B. Highest temperature no more than 40ºC

C. Relative humidity shall not exceed 95% (+25ºC)

D. No severe shaking and vibration, and the gradient to vertical should not exceed 15°

E. It can be used in the places where exists methane mixed gases or coal&dust that make cause explosions; but no gas or vapor that may erode or destroy metals

F. Environment without water dripping or environment with water-proof facilities

G. Voltage wave form is similar to sine wave and three-phase power voltage is near symmetry.

Mining Transformer Info.

1.Rated capacity: 100,200,315,400,500,630,800,1000,1250,1600,2000 KVA2.Rated voltage: Primary voltage 6000,10000 V
Secondary Voltage:400(380)693(660)1200(1140)3450 (3300)V
3. Rated frequency: 50 Hz
4.Phase number: 3 phases
5. Cooling method: Natural air Cooling (ANAN)

1.Safe
   Enclosure: sealed, moisture-proof, anticorrosion, explosion-proof design,Air-insulation dry type transformers inside.
2.Reliability
   Enclosure: Adopting German rippled tube-shaped cover, high mechanical strength, excellent cooling performance:
   Insulation system: H class insulation system with American DuPont® NOMEX@ paper as main insulation material;
   Open ventilated oval shaped coil, VPl (vacuum pressure impregnation ) method, excellent electricalperformance and strong      over-load ability.
   The core is made of high flux material, with oval section. Compact structure, solid and reliable
3.Easy usage
   Compact design, small size and light weight,
   Easy transportation with skid in the bottom of the transformer,
   Eight points fixed, easy for vertical entrance into the mine;Uniauewire connectmngroom,easy for operation.

Mine Explosion Proof Mining Transformer Core 

The low voltage winding adopts the whole section of copper foil, which is wound on the special low-voltage foil winding machine with the F-grade insulation. The foil coil solves the outstanding problems such as low voltage, high current coil winding, high short-circuit stress, unbalanced ampere turns, poor heat dissipation effect, windingspiral angle, unstable manual welding quality and so on. At the same tim-e, the winding ends of our company aresealed with resin, cured and formed, moisture-proof and antifouling. The lead copper bar is automatically welded byargon arc welding.

Transformer Test

Transformer ratio and connection
Measurement of load losses and short circuit impedance.
Measurement of no-load losses.
Separate source withstand voltage test
Induced over-voltage test
Temperature rise test
Lighting impulse withstand voltage test
Measurement of partial discharge
Other transformers like rectifier transformer are also available on request.

 

The  Rated  Performance  Data for 10kV  Grade  Mine  Explosion-proof Mobile Substation  (Including  Dry Type Transformer)
The  Rated  Performance  Data for 6kV  Grade  Mine  Explosion-proof Mobile Substation  (Including  Dry Type Transformer)

Our company has a relatively strong production capacity and efficient marketing team.Products include 110KV,220KV large ultra-high voltage transformers and 35KV below various dry transformers,oil-immersed transformers,amorphous alloy transformers,pre-installed substation and various specifications of box transformer,furnace transformer,rectifier transformer,mining transformer and other special transformers.All products of the company have passed the routine,type and special tests of the National Transformer Quality Supervision and inspection Center and wuhan High Voltage Research Institute of the State Electric Power Corporation.The enterprise has passed IS09001:2015 quality management system certification;Jiangsu province enterprise measurement certification;At the same time,10KV,35KV class power transformers,box substation and the adoption of IEC certification.Product sales cover the national market,but also exported to Australia,New Zealand,India,Madagascar,Vietnam and other countries and regions.

Transformer for On-site installation