Double-voltage-regulating power source for extra-high voltage current transformer verification

A technology of transformer calibration and ultra-high voltage current, which is applied in the direction of conversion equipment that can be converted into DC without intermediate conversion, and can solve the problem that the calibration of ultra-high voltage current transformers cannot be realized, the adjustment fineness is not enough, and the accurate positioning calibration is impossible. Check points and other problems to achieve the effect of fast adjustment speed, small adjustment fineness and precise adjustment

CN105006977AInactive Publication Date: 2015-10-28STATE GRID CORP OF CHINA +3
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-10-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a double-voltage-regulating power source for extra-high voltage current transformer verification. The power source is composed of a main voltage regulating unit and a micro voltage regulating unit in series connection. The main voltage regulating unit is composed of a main voltage regulator and achieves a wide-scope adjustable voltage source with a voltage of 0-800V and with an adjustment fineness of 1V. The micro voltage regulating unit is composed of an auxiliary voltage regulator and an isolation step-down transformer with a transformation ratio of 20 / 1, and achieves a fineness adjustable voltage source with a voltage of 0-20V and with an adjustment fineness of 0.05V. Verification of two verification points of 1% and 5% conveniently can be achieved. The double-voltage-regulating power source ensures accurate regulating of a small current, and can find verification points of 20%, 100% and 120% accurately and rapidly. The double-voltage-regulating power source has characteristics of rapid regulating speed, wide voltage regulating scope and small regulating fineness, is stable and reliable, and is suitable for usage of extra-high voltage current transformer verification.
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Description

technical field

[0001] The invention relates to a double voltage-regulating power supply for ultra-high voltage current transformer calibration, and belongs to the technical field of ultra-high voltage and large current voltage regulating equipment. Background technique

[0002] At present, the domestic 1000kV metering current transformer generally has three transformation ratios, 6000A / 1A, 3000A / 1A, 1500A / 1A, and the accuracy level is 0.2S. The 1000kV UHV transmission project has a large amount of transmission capacity, and the 1000kV UHV current transformer is an important part of the UHV transmission measurement unit. The accuracy of its measurement is related to the fairness and justice of trade settlement, so it is necessary to accurately check its error important. In order to ensure the accuracy of measurement transformers, the country promulgated the measurement verification regulations JJG1021-2007 "Power Transformers", which stipulates that the verification point o...

Examples

Embodiment Construction

[0016] The present invention will be described in further detail in conjunction with the accompanying drawings and specific embodiments.

[0017] Such as figure 1 As shown, the dual voltage-regulating power supply for ultra-high voltage current transformer verification of the present invention adopts the main voltage regulating unit and the fine-tuning unit in series to form a double voltage-regulating power supply for ultra-high voltage current transformer verification, wherein, The main voltage regulating unit is composed of the main voltage regulator 1-1, which realizes a wide-range adjustable voltage source with a voltage of 0~800V and an adjustment fineness of 1V. Specifically, the main voltage regulator 1-1 is composed of an iron core, a coil wound on the iron core and carbon brushes, with a capacity of 200kVA. The input terminal A of the main voltage regulator 1-1 1 x 1 Input AC 0~400V voltage, and adjust the voltage by sliding the upper position of the carbon brush a...