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Views: 0 Author: Site Editor Publish Time: 2021-10-16 Origin: Site
Oil-immersed transformer plays a vital role in our daily production and life. Before the transformer product leaves the factory, there are many product tests, so what kind of tests does the Oil-immersed transformer need to go through? Let's take a look together next.
This is the content list:
l Remote measurement of insulation resistance of Oil-immersed transformer
l Oil-immersed transformer DC resistance measurement
l Oil-immersed transformer measurement method
Oil-immersed transformer telemetry project, high-voltage to low-voltage and earth (crust), low-voltage to high-voltage and earth (crust), select a 2500V megohmmeter and conduct a visual inspection on the megohmmeter. The transformer should be good and the outer shell is complete. The handle is flexible, the pointer has no long resistance, and the glass is not damaged. The transformer performs an open circuit test on the megohmmeter, separates the two test leads, shakes the handle of the megohmmeter up to 120 y/min, the needle points to infinity (∞), it is better, the transformer short circuit test, shake the Oil-immersed with the transformer megohmmeter handle, overlap the two ratios in an instant, and the needle points to "0" (zero), indicating that the megohmmeter is normal. The qualified value of the Oil-immersed transformer is at a temperature of 20℃, the transformer is not less than 450MΩ, and it is not less than 300MΩ during operation. The value of this frequency shall not be lower than the value of the previous frequency by 30%. The Oil-immersed transformer absorption ratio R60/R12 should be 1.3 times at 10-30℃.
It can measure the welding quality of the internal wires and leads of the Oil-immersed transformer, whether the parallel branch is correct, whether the transformer is short-circuited or internally disconnected, whether the tap switch of the Oil-immersed transformer is the casing, and the leads are in good contact.
The Oil-immersed transformer has an electric bridge and can be used for electric bridge measurement, can be directly read, with high accuracy, without electric bridge, voltage drop method can be used, Oil-immersed transformer voltage drop method to measure DC resistance wiring, transformer ammeter DC resistance calculation Formula: where: U-Voltmeter reading (mv) I- Ammeter reading (A) Transformers with tap changers, during handover or overhaul, the Oil-immersed transformer should be measured at all tap positions. When the transformer has a midpoint lead wire, the resistance of each phase diagram should be measured, and when there is no midpoint lead wire, the line resistance can be measured. During the measurement of the transformer, all the non-tested lines should be open and not short-circuited. When measuring with an Oil-immersed transformer, you must wait for the current to stabilize before reading. Pay attention to personal safety.
Zhejiang Shuntong Electric Co., Ltd. is a professional manufacturing enterprise integrating development, production, sales, and service. The company was established in 2009 and is located in Liushi Town, "China's Power Capital", specializing in the production of various high and low voltage equipment. The main products are dry-type transformers, Oil-immersed transformers, special transformers, box-type substations, cable junction boxes, high and low voltage complete sets of equipment, voltage regulating equipment, etc. The company is committed to producing more qualified Oil-immersed transformers. If you are interested in an Oil-immersed transformer, please contact us. Our website is www.sntoom .com.
