Medium frequency low voltage high current tester
A low-voltage, high-current technology, used in instruments, measuring electrical variables, measuring devices, etc., can solve the problems of high noise, high energy consumption, and bulky step-down transformers in intermediate frequency power supplies, and achieve noise reduction, low failure rate, and simplification. effect of structure
Pending Publication Date: 2017-12-15
国营芜湖机械厂
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Problems solved by technology
[0002] The rated operating current of the current transformer is 83.5A (frequency 400Hz). The current transformer tester used in the production site used to use a 115V intermediate frequency power supply (frequency 400Hz) to directly generate a current of 83.5A. The capacity of the intermediate frequency power supply is 10 kV. Safety, and the power consumption is too large when used, and the noise of the intermediate frequency power supply is also very large
If a step-down transformer is used to reduce the intermediate frequency power supply 115V to 30 to 50 volts to generate a current of 83.5A, the capacity of the step-down transformer needs to be 3 to 5,000 VA, and the step-down transformer is also very heavy and consumes more energy. Big
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[0019] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below.
[0020] The rated current of a circuit transformer is 83.5A, the power frequency is 400Hz, and the rated current transformation ratio is 100 / 5. A current tester is required to test the current transformer. The current tester outputs 83.5A current with a frequency of 400Hz. The current transformer tester used in the production site in the past used a 115V intermediate frequency power supply (frequency 400Hz) to directly generate a current of 83.5A. very big. If a step-down transformer is used to reduce the intermediate frequency power supply 115V to 30 to 50 volts to generate a current of 83.5A, the capacity of the step-down transformer needs to be 3 to 5,000 VA, and the step-down transformer is also very heavy and consumes more energy. big. Through theoretical calculation and actual m...
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The invention relates to a medium frequency low voltage high current tester. The tester comprises a self-coupling transformer, a step-down transformer, a current transformer, 100-A contactor contacts, load resistors, band switches and contactor coils, a 115-V 400-Hz medium frequency power supply is output to the step-down transformer through the self-coupling transformer, the step-down transformer outputs a 4-V low voltage power supply, one of the load resistor is selected to be connected through the corresponding band switch to generate a 83.5-A 400-Hz test current for detecting the current transformer. Accordingly, the defect that energy consumption of an old tester is too large is overcome, noise in the medium frequency power supply working process is reduced, the cost is lowered, the structure is simplified, manufacturing is easy, the failure rate is low, and the tester is safe, reliable, capable of achieving energy conservation and environmental friendliness and convenient to operate.
Description
technical field [0001] The invention relates to the technical field of current testers, in particular to a medium-frequency, low-voltage and high-current tester. Background technique [0002] The rated operating current of the current transformer is 83.5A (frequency 400Hz). The current transformer tester used in the production site used to use a 115V intermediate frequency power supply (frequency 400Hz) to directly generate a current of 83.5A. The capacity of the intermediate frequency power supply is 10 kV. Safety, and it consumes too much energy when used, and the noise of the intermediate frequency power supply is also very large. If a step-down transformer is used to reduce the intermediate frequency power supply 115V to 30 to 50 volts to generate a current of 83.5A, the capacity of the step-down transformer needs to be 3 to 5,000 VA, and the step-down transformer is also very heavy and consumes more energy. big. It is necessary to manufacture a medium-frequency low-vo...
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Login to View More IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 叶成世胡伟朱维玮
Owner 国营芜湖机械厂