The dry-type test transformer is introduced with foreign new advanced technology and advanced production equipment. It adopts the vacuum casting molding of coil ring and the new technology and new materials of CD type iron core. Compared with the oil immersed test transformer with the same capacity and voltage, it has the advantages of light weight, small volume, beautiful appearance, stable performance, convenient use and portability, and no oil leakage. And effectively weaken the magnetic leakage and improve the insulation strength and moisture resistance. It is especially applicable to the insulation performance, DC withstand voltage and leakage current test of various electrical equipment in the power system and various power users. It is a substitute for the current heavy oil immersed transformer.
What are the main characteristics and technical indexes of dry-type test transformer
1. Impedance voltage: 12%
2. Output voltage waveform: power frequency, sine wave
4. No load loss: 0.2% ~ 0.35%
5. Allowable continuous operation time: 1 hour
⒍ continuous operation time: continuous
Application method and precautions of dry-type test transformer
1. Before use, you must carefully read the operation manual of the transformer and the manual of the matching control box (platform). Connect the connecting wire according to the instructions, and the grounding wire shall be well grounded. 2. The power supply of the dry-type transformer control box (set) is AC 220V and 380V respectively, and is output to the low-voltage side input end of the transformer through the voltage regulator. The output can be continuously adjusted to the rated voltage value through the transformation ratio.
3. Considering the safety of the dry-type test transformer and the rigor of the high-voltage test, to avoid damage to the equipment or test objects, the factory can provide complete sets of equipment as shown in the following figure to meet the needs of users
4. When conducting the DC withstand voltage or leakage current test, the high-voltage silicon stack and micro ammeter can be screwed on the high-voltage output end of the high-voltage test transformer first, and then the voltage can be gradually increased to conduct the DC test.
5. When two test transformers are connected in series (the schematic diagram is as follows), the rated output voltage of the first and second transformers are equal, and the ratio of their capacity is 2:1. The second transformer must be placed on the insulation support to ensure the insulation to the ground. When connecting in series, pay attention to the marks on the transformer (see the schematic diagram of connection mode) to make the polarity connection correct to ensure that the predetermined voltage is output; otherwise, the output voltage is zero.
Note: ① if a and B are connected reversely. It will cause the high voltage output to be zero (T1 + T2 = 0). It is enough to transpose a and B.
② The chassis of T2 test transformer must be connected with the tray of insulating support.
Test transformer, also known as booster, is the equipment for electrical strength test of power generation and supply equipment, various electrical products and insulating tool materials.
The GYD series dry-type test transformer series produced by Huayi power has completely changed the backward situation of the old-fashioned test transformer, which is bulky, heavy and heavy. After the high-voltage silicon stack produced by the supporting production is installed, it can provide DC high-voltage test power supply, and is equipped with control box (table), automatic protection micro ammeter, ball gap and other auxiliary equipment. It is especially suitable for field testing, making heavy work convenient, rapid, easy and flexible, and greatly improving efficiency. Therefore, it is welcomed by high-voltage test personnel of power system and large-scale factories and mines.
The test equipment shall be arranged with sufficient safety distance to the person and the surroundings. Try to avoid arranging equipment and laying high-voltage test leads on the personnel aisle.
The test site shall be fenced and hung with the sign "stop! High voltage danger".
The test high-voltage Lead shall have support or traction insulation. Every other section and the other end of the cable shall be guarded to prevent people from approaching and passing under.
The micro ampere meter for DC high-voltage test should be at high potential. In addition to the shielding box, it should also have automatic overcurrent protection device to prevent sudden breakdown, short circuit or burning of the meter during discharge.
For power frequency withstand voltage test, please check whether the capacity of the equipment is sufficient and avoid resonance.
The working ground wire (high-voltage tail and stabilized voltage capacitor end ground wire) and the protective ground wire (control box shell) shall be reliably grounded respectively,
In case of irregular oscillation of power supply during the test, the stability of high-voltage output must be affected. At this time, please suspend the impact power consumption such as welding for a moment or find other reasons.
The climate (temperature and humidity) requirements of the test work shall meet the requirements of the test procedures, and shielding measures shall be taken when necessary.
During the test, if it is found that the pointer of voltmeter swings greatly, the indication of ammeter increases sharply, or the test object has smoke, fire, burning smell and abnormal noise, the test shall be stopped immediately, the power supply shall be cut off, and the cause shall be checked.
The above is the explanation of the main characteristics and precautions of the dry-type test transformer by hengfengyou electric. For more information, please pay attention to hengfengyou.
Hengfengyou is a professional electrical company specializing in the production, manufacturing and sales of electrical distribution products, mainly engaged in the production and global sales of distribution transformers, rectifier transformers, electric furnace transformers, etc. We have provided OEM / ODM services for customers in Europe, America and the Middle East for 20 years. It can provide customized production of transformer core, transformer coil and transformer shell. Hengfengyou Electric will provide you with the best electrical product solutions. https://www.hengfengyou.com ； info@hengfengyou.com WhatsApp：+86158 5325 2696（Jack） +86158 5326 5269（Alisa）
