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Dry type hollow reactor interturn short circuit fault on-line real-time detection method

A technology of inter-turn short-circuit fault and air-core reactor, which is applied in the direction of instruments, measuring instruments, and measuring devices, and can solve the problem that the inter-turn short-circuit fault of dry-type air-core reactors is difficult to detect online and in real time, and achieve the effect of sensitive and accurate diagnosis

Inactive Publication Date: 2010-11-10
北京电力自动化设备有限公司
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for online detection and real-time detection of inter-turn short-circuit faults of dry-type air-core reactors to solve the long-standing problem that dry-type air-core reactor inter-turn short-circuit faults are difficult to detect online in real time

Method used

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  • Dry type hollow reactor interturn short circuit fault on-line real-time detection method

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Embodiment Construction

[0015] Such as figure 1 As shown, this embodiment includes: a dry-type air-core reactor, a magnetic field detection coil, a data acquisition card and a microcomputer. in:

[0016] Dry-type air-core reactor, the capacity, rated voltage, rated current and rated inductance are 4.4kVar, 110V, 40A and 8.76mH respectively, and the working frequency is 50Hz. The reactor has two parallel envelopes, each envelope is formed by parallel connection of two layers of coil branches, and a set of detection coils are respectively arranged on the upper and lower symmetrical positions of the outer surface of each envelope, and the magnetic field detection coil is made of 130-grade thick paint film polyester Enamelled round copper wire (QZ-2 / 130) is wound, and the nominal diameter of the round copper wire is 0.1mm.

[0017] Microcomputer and data acquisition card, microcomputer model Inter Pentuim4 CPU 3.06GHz; memory 1G. Data acquisition card model NI PCI-622; 16 single-ended channels, 8 diff...

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Abstract

The invention discloses a dry type hollow reactor interturn short circuit fault on-line real-time detection method. Magnetic field detection coils are arranged in the upper and lower symmetrical positions of each covering and sealing outer surface of a dry type hollow reactor in pairs, the effective values of voltage differential signals of each pair of magnetic field detection coils are collected when the dry type hollow reactor is in a normal operation state, the reference average value Eio and the reference standard variance dio of the voltage differential signals are calculated, then, the voltage differential signals of the corresponding magnetic field detection coils are detected on line, the on-line average value Ei and the on-line standard variance di of the voltage differential signals are calculated, and finally, the actual operation state of the reactor is judged through comparing Ei with Eio and comparing di with dio. Subband processing is adopted for collected signals, and the invention is favorable for sensitively and accurately detecting the reactor interturn short circuit fault.

Description

technical field [0001] The invention relates to an online real-time detection method in the field of electric power technology, in particular to an online real-time detection method for a dry-type air-core reactor inter-turn short circuit fault. Background technique [0002] Reactor plays the role of compensating reactive power, limiting short-circuit current, and filtering high-order harmonics in the power system, and is one of the important power equipment of the power system. Compared with oil-immersed reactors, dry-type air-core reactors have the advantages of uniform initial voltage distribution, good linearity, low loss, low noise, convenient installation, and simple maintenance, so they are widely used. [0003] Due to severe working conditions, dry-type air-core reactor accidents occur frequently. Statistics show that the number of inter-turn short-circuit faults accounts for more than 50% of the total number of dry-type air-core reactor faults. If not eliminated in...

Claims

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Application Information

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IPC IPC(8): G01R31/06
Inventor 赵彦珍马西奎梁正波应柏青
Owner 北京电力自动化设备有限公司
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