A DC electric power used for large current transducer check

A technology of transformer calibration and DC power supply, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., to achieve high stability, high precision, and high conversion efficiency.

Inactive Publication Date: 2009-07-08
WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no DC power supply that meets all the above requirements.

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  • A DC electric power used for large current transducer check

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Embodiment Construction

[0016] The main circuit diagram of the DC power supply for large-current transformer verification in the embodiment of the present invention is shown in Figure 1. The DC power supply for large-current transformer verification includes four parts, which are a full-control rectification module, an inverter module, High frequency transformer and uncontrolled rectification module.

[0017] (1) Fully-controlled rectification module, which includes a three-phase rectifier bridge composed of six power switch tubes (T1-T6) and diodes (D1-D6) connected in parallel on the six power switch tubes, a capacitor C0 composed of filters. Among them, six power switch tubes constitute a three-phase PWM rectifier circuit, and its switches are controlled by the sine pulse width SPWM method to realize high-frequency PWM rectification, convert the AC power obtained from the system into DC power, and then filter out the high voltage in the output voltage through the capacitor C0 frequency harmonic c...

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Abstract

The invention relates to a direct current supply used for checking a large current transformer. The direct current supply is characterized in that four parts, namely, a full-controlled rectifier module, an inverse module, a high-frequency transformer and an uncontrolled rectifier module are included; the four parts are electrically connected sequentially; the inverse module is connected in parallel with a primary side of the high-frequency transformer; and a secondary side of the high-frequency transformer is connected in parallel with an AC side of the uncontrolled rectifier module. The direct current supply ensures that the ripple coefficient of the output current is less than 0.5 percent, the output current is continuously adjustable in a wide range, the volume and the weight are reduced, the cost is lowered greatly, and the requirements for checking the large current transformer in an electric power system can be satisfied at the same time.

Description

technical field [0001] The invention relates to a DC power supply for checking large current transformers. Background technique [0002] With the increase of domestic high-voltage DC transmission projects, new requirements are put forward for the DC power supply used for the calibration of high-current transformers. It is not only required that the output current of this type of power supply can be continuously adjusted in a wide range from a few amps to 10,000 amps, but also to ensure the high precision and high stability of the output current. At the same time, in order to meet the needs of field testing, this Class power supply is small in size, light in weight and high in reliability. However, there is currently no DC power supply that meets all of the above requirements. Contents of the invention [0003] The purpose of the present invention is to provide a DC power supply with higher precision for calibrating large current transformers. [0004] The technical solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/155H02M7/515H02M1/14
Inventor 张冰刘飞邱进何妍
Owner WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID
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