Cascade High-Voltage Test Transformer
Dary Electric recommends
Working Principle:
This series of control boxes (consoles) is composed of a contact-type voltage regulator (above 50kVA, it is an electric column-type voltage regulator) and its control, protection, measurement, and signal circuits. It is connected to a 220V or 380V power frequency supply, and adjusts the voltage regulator (i.e., the input voltage of the test transformer) to obtain the required high test voltage value.
Structure (Panel Layout):
Control box panel layout
1—Power socket 2—Digital display time relay
3—Digital display current setting device 4—Start, stop, and timing buttons
5—High voltage indicator 6—Low voltage current indicator
7—Signal light, alarm flashing light 8—Terminals
Control console panel layout
1—Signal light, alarm flashing light 2—Alarm sound outlet
3—Digital current protection relay 4—High voltage indicator
5—Digital display time relay 6—Start, stop, and timing buttons
7—Low voltage ammeter
Technical Parameters, Specifications, and Selection Matching
The capacity of this control box (console) is rated according to the capacity of the voltage regulator. If it is used in conjunction with a test transformer (short-time duty within 30 minutes), it can be selected according to the provisions of the People's Republic of China Electric Power Industry Standard "DL474.4-92": P0=0.75P. Where P0—test transformer capacity; P—voltage regulator capacity. If used for batch testing of products in electrical professional factories, the voltage regulator capacity should be equal to the test transformer capacity, i.e., P0=P.
Product Introduction
Capacity range: 1～600KVA
Single unit rated output voltage: (AC) 50, 100, 150, 200, 300kV
（DC）70, 140, 210kV
Transformation ratio: 500/1, 1000/1, 1500/1, 2000/1, 3000/1
Transformation ratio error: ＜±1%
Impedance voltage: ＜10%
Overview: This series of control boxes (consoles) is designed and produced according to the unique application scope of high-voltage test transformers. Its functions include:
A. Closing sound and light alarm; B. Timing sound and light alarm; C. Electronic low-voltage current protection (box type); D. Direct reading of high voltage; E. Free setting of withstand voltage test time (digital display); F. Mobile structure (desktop type)
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.
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