Detection method for disconnection of voltage transformers

A technology for voltage transformers and detection methods, which is applied in the field of voltage balance method detection of disconnection of voltage transformers used for protection of pumped storage generators, can solve problems such as difficult detection of voltage transformer disconnection, and achieve wide application and simplified disconnection Line detection method, high reliability effect

Active Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that voltage transformer disconnection is difficult to detect, and propose a voltage transformer disconnection detection method s...

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  • Detection method for disconnection of voltage transformers
  • Detection method for disconnection of voltage transformers
  • Detection method for disconnection of voltage transformers

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] like figure 1 As shown, it is the wiring method of the generator terminal voltage transformer (hereinafter referred to as PT) commonly used in the pumped storage power station. The phase voltage measured by the generator terminal PT is converted from an analog signal to a digital signal after the filter circuit. Calculated to obtain PT1 line voltage U 1 AB , U 1 BC , U 1 CA , and PT2 line voltage U 2 AB , U 2 BC , U 2 CA . The above voltages enter the voltage balance comparison module, respectively for U 1 AB and U 2 AB , U 1 BC and U 2 BC , U 1 CA and U 2 CA Calculate and test.

[0029] with U 1 AB and U 2 AB For example:

[0030] To PT1 line voltage U 1 AB Calculate the vector R 1AB +JX 1AB , calculate U according to the vector 1 AB Amplitude:

[0031] | U ...

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Abstract

The invention discloses a detection method for disconnection of voltage transformers. Two voltage transformers are applied to generator protection in a pumped-storage power station, and include a first voltage transformer in a power generation direction and a second voltage transformer in a pumping direction. The detection method for disconnection of the voltage transformers comprises the following steps of: collecting voltage signals from the first and second voltage transformers; working out voltages U1AB, U1BC, U1CA, U2AB, U2BC and U2CA; working out voltage amplitude differences of lines of the two voltage transformers [delta]UAB, [delta]UBC and [delta]UCA, and judging whether the voltage transformers are in disconnection. The detection method can be applied to various connection modes at the generator end of the pumped-storage power station, and is simplified in detection on disconnection of the voltage transformers in various connection modes, wide in application range, high in reliability, and convenient to implement general microcomputer protection.

Description

technical field [0001] The invention relates to a detection method for disconnection of a voltage transformer at the machine end of a generator (regardless of the direction of power generation or the direction of water pumping), in particular to a voltage balance method for detecting disconnection of a voltage transformer for protection of a pumped storage generator method. Background technique [0002] At present, the task of the voltage transformer is to accurately transform the primary side voltage to the allowable voltage of the relay protection and the secondary instrument, so that the relay protection device and the instrument can not only work under low voltage conditions, but also accurately reflect the power system. Operation of medium and high voltage equipment. [0003] In a pumped storage power station, since the unit operates in two different working conditions of power generation and water pumping, the voltage transformers for generator protection are also set...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 孟繁聪王莉
Owner STATE GRID CORP OF CHINA
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