YDQ Gas Type AC/DC Hipot Test Set
Product Introduction
YDQ series AC Hipot Test Set are essential equipments during electrical equipments tests and preventive tests. With the development of China's power industry, people required higher about the voltage class of testing transformer, and the traditional oil / dry type test transformer cannot meet the requirement in volume, weight, and functions.
With the development of Chinese basic scientific research, the appliance of new material and new workmanship, the new medium SF6 enter the electrical equipment applications. The SF6 widely used because of its excellent insulating properties and arc performance and incombustible.
AC Hipot Test Set compared with the traditional oil / dry type test transformer, 20%-60% reduction in weight (depend on the voltage and capacity class), without oil pollution, voltage class can up to 300kV, less than 2Pc under rated voltage. It is especially suitable for condition of working or moving frequently.
Product Characteristics
1、The inflatable test transformer is compact in size and lightweight, weighing 40%–65% less than oil-immersed transformers of the same grade.
2、It operates without oil or grease, requiring virtually no maintenance.
3、The unit is resistant to adverse weather and environmental conditions, remains stable during field transport, and is ready for immediate testing on-site.
4、It offers significantly higher insulation strength compared to oil-immersed transformers and produces minimal corona discharge.
Service conditions
1. Rated conditions requirements of AC testing transformer:
A. Ambient temperature : maximum: +40 ℃ minimum:-20 ℃
B. Maximum relative humidity, when the air temperature is 25 ℃, relative humidity less than 85%.
C. Installation site without seriously affecting the transformer insulating gas, steam, chemical dust, dirt and other explosive media.
D. AC test transformer the input voltage gradually increases and the output should be with sufficient protection resistor in series, should open/close under high voltage.
2. Allowed running time
Under rated voltage of rated capacity, continuous operation shall not exceed half an hour, every interval time is 5-10 times of working time, in order to ensure adequate cooling of the transformer, under rated voltage and two-thirds of the rated current allows long-term continuous operation
Working principle
Input power to control cabinet which with over-current tripping and zero interlock devices, input to YDQ primary winding through, according to the principle of electromagnetic induction, in accordance with the turns ratio of primary winding and secondary winding to get multiples of the same voltage amplitude - frequency high voltage at the secondary (high voltage) winding side. DC high voltage can be obtained by this high -frequency voltage through high voltage silicon rectifier stack and regulator capacitor filtered, and its high-frequency RMS amplitude is 2 times of this high-frequency voltage.
