100KV20KVA Power Frequency Withstand Voltage Test Device
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Working Principle:
It is a single-phase transformer with connection group label I.I. Use a two-frequency 220V (380V for above 10KVA) power supply to connect to the series operation box (console). Through the autotransformer voltage regulator inside the operation box (external for above 50KVA), adjust the output voltage to 0-200V (or 0-400V) and supply it to the primary winding of the oil-immersed test transformer.
According to the principle of electromagnetic induction, the high voltage required for the test can be obtained on the high-voltage winding of the test transformer.
Product Structure:
It adopts a single-frame core structure. The primary winding is wound on the iron core, and the high-voltage winding is outside. This coaxial arrangement reduces leakage flux, thereby increasing the coupling between windings. The product shell is made into an octagonal structure that fits well with the core, and the overall appearance is beautiful and elegant.
Product Introduction
20KVA/100KV High-Voltage Power Frequency Withstand Voltage Test Device is a YDJ series oil-immersed test transformer produced after many improvements based on the original similar products according to the Ministry of Machinery and Electronics "Test Transformer" standard. It is a new type of product produced after improvements based on the YDJ (G) series test transformers according to the national standard "ZBK-41006-89".
20KVA/100KV High-Voltage Power Frequency Withstand Voltage Test Device has the characteristics of small size, light weight, compact structure, complete functions, strong universality, and convenient use. It is particularly suitable for insulation strength tests under power frequency or DC high voltage for various high-voltage electrical equipment, electrical components, and insulating materials in power systems, industrial and mining enterprises, and scientific research departments. It is an indispensable important equipment in high-voltage testing. |
Precautions:
◆ Test personnel should divide the work and clarify the methods between each other. There should be a dedicated person to monitor the safety of the site and observe the state of the test object.
◆ The test object should be cleaned and absolutely dry to avoid damage to the test object and errors in the test.
◆ For large-scale tests, a no-load test should generally be conducted first. That is, without connecting the test object, raise the voltage to the test voltage, calibrate various meters, and adjust the gap.
◆ The voltage raising speed should not be too fast, and sudden pressurization must be prevented. For example, sudden closing when the voltage regulator is not at zero position, and sudden power cut should also be avoided. Generally, the switch should be turned off after the voltage regulator is reduced to zero.
◆ When the voltage rises to the test voltage, start timing. After 1 minute, quickly reduce to below 1/3 of the test voltage before cutting off the power.
◆ During the voltage raising or withstand voltage test, if the following abnormal conditions are found, the voltage should be immediately reduced, the power cut off, the test stopped, and the cause investigated: ① The voltmeter pointer swings greatly; ② Insulation burning or smoking is found; ③ Abnormal sounds inside the test object.
◆ Before and after the withstand voltage test, the insulation resistance should be measured to check the insulation condition.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
