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The Mining Explosion-proof Dry-type Transformer

The Mining Explosion-proof Dry-type Transformer is applicable for places where underground coal mines are humid, contain gas and coal dust, and have explosion risk, and provides power supply for the comprehensive mechanical coal mining equipment or hand-held electric drill, lighting and other devices.

Technical Parameters
Product Features
Environment for Use

Rated Capacity (kVA)	Voltage Combination (kV)		Connection Unit Symbol	Loss		Impedance Voltage (%)	No-Load Current (%)
Rated Capacity (kVA)	Primary Voltage	Secondary Voltage	Connection Unit Symbol	No Load	Load	Impedance Voltage (%)	No-Load Current (%)
50	6±5%	0.693/0.4	Yy0(d11)	350	550	4	2.5
100				520	920	4	2.5
200				820	1550	4	2
315		1.2/0.693		1100	2150	4	1.8
400				1300	2600	4	1.8
500				1500	3100	4	1.5
630				1800	3680	4	1.5
800		1.2/0.693 3.45	Yy0(d11) Yyn0	2050	4500	4	1
1000				2350	5400	4	1
1250				2750	6500	4	1
1600				3350	8000	4	0.8
2000		3.45	Yyn0	3800	9500	4.5	0.6
2500				4500	10600	5	0.6
3150				5300	12500	5.5	0.6
4000				6100	14000	6	0.6
5000				7210	17640	6	0.6
6300				8070	19055	6	0.7

1) Low No-load Losses
1. Uses high-quality silicon steel sheet.
2. Wound iron core fully utilizes orientation of the silicon steel sheet. The magnetic property is restored through annealing process, reducing its no-load losses by 20% to 35%.
2) Low Noise
The noise is from the iron core, and is transferred to the surrounding through the housing.
Measures for noise reduction:
1. Reduce the noise source, and adopt the seamless wound iron core, compact structure, small magnetostriction and low noise.
2. The connection joints are added with silicon sheet, which cuts off the noise spreading approach.
3) Light Weight and Small Volume.
4) It is explosion-proof and damp-proof.
5) Energy Conservation and Environmental Protection
1) Adopt a Nomex paper-wrapped line with insulation grade C that is imported from American DuPont Company. It uses air insulation and cooling. It has no pollution on the environment, and the product has long service life; the product can be decomposed for recovery after the service life ends;
2) The high-quality 30Q130 cold-rolled oriented silicon steel sheet and oxygen-free copper conductor are adopted, so that the actual total loss is lower than that of the other similar products.It saves the energy, and lowers noise.
1.The elevation shall not exceed 1,000m;
2.Ambient temperature    Maximum temperature            +40℃/104°F
                                        Maximum daily average temperature +30℃/86°F
                                        Maximum annual average temperature +20℃/68°F
                                        Minimum temperature              -5℃/23°F
3.The relative humidity shall not exceed 95% (at +25 ℃/77°F).
4.Mines with a mixture of methane gas and coal dust, and a risk of explosion;
5.Places without strong bump and vibration and with inclination from the vertical plane not exceeding 15°;
6.No sufficient gas or vapour to cause metals corrosion or insulation damage;
7.Places without dripping;
8.The waveform of the supply voltage is similar to the sine wave;
9.The three-phase supply voltage is approximately symmetrical.