Voltage transformer's second harmonic elimination device detector
A voltage transformer and secondary harmonic elimination technology, which is applied in the field of power system secondary equipment detection, can solve problems such as potential safety hazards, difficult testing, and easily damaged testers, and achieve intelligent operation, convenient portability and maintenance, and small appearance Effect
Active Publication Date: 2017-01-11
STATE GRID CORP OF CHINA +1
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Effectively solve the problems of fragile tester, hidden safety hazards and difficult testing in traditional methods
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[0020] Below by describing the present invention in detail, in conjunction with appended figure 1 , to further illustrate the technical solution of the present invention. It should be noted that the harmonic elimination principle of a certain type of PT secondary harmonic elimination device 9 listed in the following embodiments meets the requirements of the current power system PT secondary harmonic elimination device, and is relatively universal.
[0021] Different types of PT secondary harmonic elimination devices are used to determine the size of 3U0 at different frequencies. The principle of the harmonic elimination device is as follows:
[0022] Resonance criterion: 17HZ harmonic voltage ≥ 17V, 25HZ harmonic voltage ≥ 25V, 150HZ harmonic voltage ≥ 33V;
[0023] Grounding criterion: fundamental voltage ≥ 30V;
[0024] Overvoltage criterion: fundamental voltage ≥ 120V.
[0025] Such as figure 1 As shown, the detector for the secondary harmonic elimination device of the...
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The invention discloses a voltage transformer's second harmonic elimination device detector, which comprises seven units: a panel and storage unit, a power control unit, a digital processor unit, a harmonic wave generation unit, an output switching interface, a detection unit and a protection unit. The panel and the storage unit comprises a host computer processor unit, a USB interface, a data storage (unit), a display screen and a keyboard. The harmonic wave generation unit comprises a D / A conversion and amplification module, a power amplifier bus voltage unit, a fundamental wave power amplification module and a harmonic wave power amplification module. According to the invention, it is possible to accurately, rapidly and safely simulate the faults of resonance, grounding and over-voltage of a power grid of 35kV or below, and to quickly check the functions of harmonic elimination, grounding and over-voltage warning of a PT secondary harmonic elimination device, therefore, effectively solving the problem of a traditional method that a detector is easily damaged, safety hazards are caused and the detection process is difficult.
Description
technical field [0001] The invention relates to a detector for a secondary harmonic elimination device of a voltage transformer, which belongs to the field of secondary equipment detection of a power system. Background technique [0002] At present, PT (voltage transformer) secondary harmonic elimination device is one of the two core harmonic elimination devices in rural power substations. Its good service performance is an important condition to ensure the quality and stability of power supply in rural power substations. However, there are many accidents caused by the damage of the PT secondary harmonic elimination device in the substations that have been put into operation. For example, on December 27, 2015, the 10kV#4 bus PT of xx substation burned down. After investigation, it was found that when the PT resonated, the resonance voltage did not reach the start-up value of the primary resonance eliminator, and the secondary resonance eliminator had already been damaged and...
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IPC IPC(8): G01R31/00
CPCG01R31/00Y02E40/40
Inventor 徐雄军彭佳黄正丹任乔林曹冲张伦杜涛肖蕾江宁张欢胡华志罗增辉
Owner STATE GRID CORP OF CHINA