Low interference frequency change power for high-voltage testing

A high-voltage test and variable frequency power supply technology, which is applied to electrical components, conversion equipment for intermediate conversion to DC, conversion of AC power input to DC power output, etc., can solve problems such as partial discharge test, large interference, and difficulty in field wiring , to achieve the effect of simple and convenient operation, ensuring safety and reducing demand

CN1719709AActive Publication Date: 2006-01-11SIEYUAN ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2006-01-11

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Abstract

This invention relates to a low disturbance conversion supply, in which, a three-phase AC input is sent to a trigger control and rectified circuit of a thyristor, the control signal of which is generated by a computer control circuit, its rectified output is sent to a bridge output circuit, the output signal of which is sent to a short circuit box and sent to an output sampling and testing circuit, which sends the sampled signal for testing then sends the tested signal to a computer control circuit, At the same time, the system voltage is also sent to a computer control circuit via the system voltage input and measurement circuit, which generates an input control signal needed by a synchronous and blanking signal generation circuit.
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Description

technical field

[0001] The invention relates to a power supply in the field of power systems, in particular to a low-interference variable-frequency power supply for high-voltage tests. Background technique

[0002] On-site high-voltage tests must also comply with the principles of high-voltage tests: the test must simulate the operating field strength state. Therefore, the AC voltage test can correctly find the fault, while the DC test does not meet the above-mentioned high-voltage test principles. The high-voltage test system used for cross-linked cables and SF6 insulated electrical appliances (GIS, GIT) has high voltage and high power, and traditional test transformers or induction resonant power supplies are too heavy to be suitable for field use. The solution is to use an AC resonant power supply, whose weight can be reduced by 15-20 times. The existing AC resonant power supply has two modes: one is the switching frequency conversion of SPWM modulation. Due to the exi...

Examples

Embodiment Construction

[0016] like figure 1 As shown, the present invention includes: a computer control circuit 1, a thyristor trigger control and rectification circuit 2, a bridge output circuit 3, an output sampling and measurement circuit 4, a short-circuit box 5, a system voltage input and measurement circuit 6, a partial discharge circuit Synchronization and blanking signal generation circuit 7 . The three-phase AC input is sent to the thyristor trigger control and rectifier circuit 2; the control signal of the thyristor trigger control and rectifier circuit 3 is generated by the computer control circuit 1, and its rectified output is sent to the bridge output circuit 3; the bridge output circuit The output signal of 3 is sent to the short-circuit box 5 and sent to the output sampling and measurement circuit 4, and the output sampling and measurement circuit 4 sends the sampled signal to the computer control circuit 1 after passing through the measurement circuit; similarly, the voltage of the...