Capacitive voltage transformer transient error digital correcting method

A technology of voltage transformer and digital correction, which is applied in the direction of instruments, measuring electric variables, measuring devices, etc., and can solve problems such as abnormal operation of fault distance measuring devices and failure of fast tracking of capacitive voltage transformers, etc.

Inactive Publication Date: 2009-05-13
CHONGQING UNIV
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  • Claims
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Problems solved by technology

When its original input signal suddenly drops due to the transmission network itself, the output of the capacitor voltage transformer cannot quickly track the change of its input, and the error can reach more than 20%, which may cause the relay protection of the power system using this signal and fault location devices not working properly

Method used

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  • Capacitive voltage transformer transient error digital correcting method
  • Capacitive voltage transformer transient error digital correcting method
  • Capacitive voltage transformer transient error digital correcting method

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Embodiment

[0080] The following is attached Figure 5 The present invention is further described:

[0081] attached Figure 5 It is an example model. The example model comes from the capacitive voltage transformer model adopted by the dynamic model laboratory of China Electric Power Academy. The dotted box is the capacitive voltage transformer. figure 2 The structure is similar.

[0082] The component parameters in the instance model are as follows:

[0083] 1) 500kV capacitive voltage transformer equivalent circuit parameters (equivalent to the primary side)

[0084] C 1 = 0.0047μF, C f = 0.00236μF, R 2 =1551.57Ω

[0085] C 2 = 0.1203μF, L f =417.6H,L 2 =3690H

[0086] L 1 =80H,R f =100.8KΩ, R 1 =1.113KΩ

[0087] PT transformation ratio: U I / U II / U III = 12 kV / 100 3 ...

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Abstract

The digital correcting method for the transient error of capacitive voltage transformer can reduce the secondary output error to about 2 % during the abrupt drop of the primary input voltage, and provides fast relay protector and fault range finder with capacitive voltage transformer with digital correcting method of accurate and fast tracing the input voltage change. The basic principle is that the capacitive voltage transformer is considered as one time-invariant transmission network with the secondary output voltage and the primary input voltage possessing some inevitable corresponding relation, so that on the basis of acquiring the secondary output voltage value, the primary voltage waveform may be derived based on the corresponding relation and the transient error of capacitive voltage transformer may be eliminated.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, in particular to a digital correction method for the transient error of a capacitive voltage transformer. Background technique [0002] There are large energy storage components such as inductance and capacitance inside the capacitive voltage transformer. When the voltage on the input side suddenly drops due to a short circuit in the system, the output voltage cannot immediately respond to the change of the input voltage, resulting in the connection on the output side. Misoperation of fast relay protection device, fault distance measuring device, etc. The adjustment and control of the transient error of the capacitive voltage transformer can only rely on the manufacturer to adjust the internal parameters of the capacitive voltage transformer through experiments or simulations so that the transient error meets the relevant national standards, that is, the input termi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02
Inventor 熊小伏
Owner CHONGQING UNIV
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