GTB series dry-type testing transformer

The GTB series dry-type testing transformer, also known as a booster transformer, is essential equipment for testing the dielectric strength of power generation and supply equipment, various electrical products, and insulating tool materials.

The GTB series dry-type testing transformer completely changes the outdated situation of old testing transformers being bulky, large, and heavy. When equipped with high-voltage silicon stacks it can provide a DC high-voltage test power supply. With a control box (unit), automatic protection microammeter, sphere gap, and other auxiliary equipment, it is especially suitable for on-site testing, making heavy work convenient, fast, easy, flexible, and significantly improving efficiency. The dry-type testing transformer series is suitable for on-site testing of the insulation performance of various electrical equipment by power systems and various power users, as well as DC high-voltage, low-current high-voltage power supplies in various voltage systems or devices. It outputs AC and DC high voltage, providing high voltage for various high-voltage tests. Dry-type testing transformers are used for on-site testing of the insulation performance of various electrical equipment.

Chinese Name

GTB Series Dry-Type Testing Transformer

Other Names

GTB Series Dry-Type Testing Transformer, Booster Transformer

Characteristics

Small size, light weight, compact structure

Product Alias

GTB series dry-type testing transformer, high-voltage testing transformer, Power high-voltage testing transformer 、 Ultra-light high-voltage testing transformer 、 Cascaded high-voltage testing transformer 、 AC/DC high-voltage generator 、 High-voltage booster 、 High-voltage withstand tester 、 High-voltage withstand instrument Dry-type testing transformer

Product Characteristics

1. Small size, light weight, compact structure, no oil leakage, maintenance-free

2. Simple and intuitive wiring, easy to use

3. Good insulation reliability, beautiful appearance

4. Overvoltage protection function

Product Parameters

1. Impedance voltage: ≤12%

2. Output voltage waveform: Sine wave

3. Surface temperature rise: <55 ℃

4. No-load loss: <0.4%

5. Allowable continuous operating time: 1 hour

6. Intermittent operating time: Continuous

Related Information

1. Caution should be exercised when using AC/DC dual-use testing transformers.

2. Transformers do not actually generate electromagnetic radiation.

3. Distribution transformer How to phase on-site

4. Brief description of power transformer test items and selection of test equipment

5. Basic knowledge of transformers

6. How to choose a testing transformer

7. Transformer fault analysis and handling

8. Transformer short-circuit accident analysis

9. Power transformer model definition

10. Characteristics and applications of power frequency resonant transformers

11. Principle and treatment of moisture absorption and dampness of transformer body after drying

12. How is partial discharge in a transformer generated? How to prevent it

13. Transformer application solutions

14. What is a dry-type transformer

Single Unit Use

1) Before the test, the high-voltage tail "┻" end of the testing transformer should be reliably grounded,

otherwise it will endanger personal and equipment safety.

2) Before operation, you must be familiar with the electrical principles and usage methods of the testing transformer and the power control box.

3) Wiring according to the wiring diagram.

4) After the preparation work and safety measures are in place, conduct an empty test of the equipment.

5) Connect the test sample.

6) Turn on the power, and the power indicator light on the control box (unit) will light up.

7) Press the closing button, and the closing indicator light will light up.

8) Increase the pressure evenly clockwise, observe the voltage value reached by the voltmeter and the condition of the test sample until the rated test voltage.

9) Maintain the specified withstand voltage time and observe the ammeter and the test sample.

10) When the withstand voltage time is up, observe the kV meter and quickly return the voltage regulator to zero.

11) Discharge through a resistor using a discharge rod, and then discharge directly to ground.

12) Discharge each part of the high-voltage section that may be charged, change or remove the high-voltage line leads, and the single (phase) test is terminated.

Multiple Units in Series

Application Areas

The GTB series dry-type testing transformers are designed and produced using multiple dry-type testing transformers connected in series to form a series testing device. Because of the convenient dispersed combination, it can suit various on-site needs. The individual components are lightweight, making transportation and movement easy, and departments using higher voltage levels can easily obtain higher test power sources on-site.

Working Principle

In the series high-voltage test device, except for the highest voltage level testing transformer, all other testing transformers have an excitation winding connected in series with the high-voltage winding. This winding has the same parameters as the primary winding of the next level testing transformer.

The primary winding of the first-level testing transformer is powered by the control box. The tail end and casing of the first-level high-voltage winding are grounded, and the head end is connected to the tail end and casing of the second-level testing transformer. The excitation power for the secondary winding of the second-level testing transformer is supplied by the series tap of the first level. In this case, the high voltage of the second-level testing transformer is the superposition of the output voltages of the first and second levels. Similarly, the third level can be added.