GTB Dry Type AC/DC Hipot Test Set
Product Introduction
The series of AC dry-type test transformers produced by our company completely overcomes the shortcomings of old-fashioned and bulky models. This instrument is equipped with a high-voltage silicon stack produced by our company, which can provide a DC high-voltage testing power supply. This instrument is used in conjunction with control cabinets, automatic protection microamperes, ball gaps, etc., and is particularly suitable for on-site testing, making heavy work convenient, fast, simple, flexible, and efficient. Therefore, it has received high praise and appreciation from customers in the power system and large industrial and mining enterprises.
技術的パラメータ
| impedance voltage | ≤12% |
| output voltage wave form | sinusoid |
| surface temperature rise | ＜55℃ |
| no-load current | ＜4% |
Main product specifications
| specifications and models | capacity(kVA) | input voltage(V) | output voltage(kV) | output current(mA) | 出力DC高電圧 | weight(kg) |
| 1.5/50 | 1.5 | 200 or 400 | 50 | 30 | 70 | 15 |
| 5/15 | 5 | 333 | 15 | |||
| 3/50 | 3 | 60 | 20 | |||
| 5/50 | 5 | 100 | 27 | |||
| 6/50 | 6 | 120 | 30 | |||
| 10/30 | 10 | 333 | 30 | |||
| 10/50 | 10 | 200 | 40 | |||
| 15/50 | 15 | 300 | 50 | |||
| 20/50 | 20 | 400 | 55 | |||
| 25/50 | 25 | 500 | 60 | |||
| 30/50 | 30 | 600 | 65 | |||
| 15/25 | 15 | 220 | 25 | 600 | 200 | 72 |
| 5/100 | 5 | 200 or 400 | 100 | 50 | 140 | 60 |
| 10/100 | 10 | 100 | 65 | |||
| 10/120 | 10 | 120 | 70 | |||
| 15/100 | 15 | 150 | 75 | |||
| 20/100 | 20 | 200 | 75 | |||
| 25/100 | 25 | 250 | 80 | |||
| 15/120 | 15 | 120 | 125 | / | 120 | |
| 20/120 | 20 | 160 | 130 | |||
| 25/120 | 25 | 200 | 140 | |||
| 30/120 | 30 | 250 | 150 |
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Product features
1. This series of products utilizes advanced production equipment and adopts coil winding epoxy vacuum casting and high-quality cold-rolled silicon steel wound CD type iron core, effectively reducing magnetic leakage. DC withstand testing does not require an external silicon stack, only the DC high-voltage silicon stack provided by our company needs to be installed at the high voltage end to obtain DC.
2. Simple and intuitive wiring, easy to use.
3. Good insulation reliability and beautiful appearance.
4. The dry-type test transformer has overcurrent protection function.
Core Advantages
The reason why dry-type test transformers have become an upgraded substitute for heavy oil immersed transformers is mainly due to the following characteristics:
Characteristic dimension | Specific advantages | Brief description |
Physical properties
| Lightweight and portable | The weight is reduced by about 30% -50% compared to oil immersed transformers of the same specifications, and some ultra light products are lighter, making them easier to handle on site. |
Compact size | Adopting epoxy vacuum casting and CD type iron core technology, the structure is compact and space saving. | |
Performance and Maintenance
| No leakage, maintenance free | Abandoning traditional oil insulation, completely solving the problem of oil leakage, and possessing characteristics such as moisture resistance, dust resistance, and flame retardancy. |
High insulation strength | Epoxy resin casting effectively weakens magnetic leakage, improves electrical insulation strength and moisture resistance. | |
Function and Safety | Dual use of AC and DC | Combined with high-voltage silicon stack, it can output DC high voltage to meet the requirements of DC withstand voltage and leakage current testing. |
Complete protection function | Usually integrated with overcurrent protection, overvoltage protection, zero start, discharge alarm and other functions to ensure operational safety. |
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Main application scenarios
Dry type test transformers are mainly used in situations where insulation strength assessment of electrical equipment is required, including:
Power system: Power supply bureaus, substations, etc. conduct power frequency withstand voltage and DC leakage tests on power transformers, cables, switchgear, etc. on site.
Equipment manufacturing and scientific research: Electrical equipment factories conduct factory inspections on products, and research institutions and university laboratories conduct high-voltage insulation tests.
Mining and special environments: Due to complex on-site conditions, enterprises such as railways, oil fields, and mines have high requirements for equipment portability and safety. Dry type transformers are an ideal choice.
Frequently asked questions
Q1. Why should I choose a dry type test transformer instead of an oil-immersed test transformer?
A:Dry type test transformers are lighter, cleaner, and require no insulating oil, eliminating the risk of oil leakage. They are ideal for indoor use, laboratories, factories, and maintenance departments where environmental cleanliness and easy transportation are important. They also require less routine maintenance than oil-immersed models.
Q2. How do I choose the right voltage and capacity for my testing application?
A:The required output voltage and capacity depend on the test object, its voltage rating, and capacitance. Simply tell us what equipment you need to test (such as cables, transformers, switchgear, or motors), and our engineers will recommend the most suitable model for your application.
Q3. Is your dry type test transformer suitable for continuous operation?
A:Our transformers are primarily designed for AC withstand voltage testing. Depending on the rated capacity and test conditions, they can operate continuously for a specified period. If your application requires long-duration testing, we can recommend a higher-capacity model or a customized solution.
Q4. Can multiple dry type test transformers be connected together?
A:Yes. Our dry type test transformers support cascade (series) connection to achieve much higher output voltages, making them suitable for testing large power transformers, long cables, GIS equipment, and other high-voltage apparatus.
