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A method for judging short circuit of electric device

An electrical device and current technology, applied in the field of judging the short circuit of electrical devices, can solve the problem that the short-circuit current of low-voltage switchgear is not very familiar, and achieve the effect of avoiding judgment failure, fast judgment and accurate calculation.

Active Publication Date: 2018-01-30
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

In addition, bus ducts are installed from the transformer to the low-voltage switchgear, and the two rows of switch cabinets are also connected through bus couplers and bus ducts. Through communication, it is found that users are not very familiar with how to calculate the short-circuit current in the low-voltage switch cabinet

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  • A method for judging short circuit of electric device

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Embodiment Construction

[0026] In the field of medium and low-voltage distribution networks, because the short-circuit current of the electrical device will be many times larger than the normal operating current during short-circuit, and when the primary current of the current transformer is large, the iron core will be saturated, the excitation current will be very large, and the error will be seriously out of tolerance. The patent transforms the method of judging whether the electrical device is short-circuited into an online monitoring of the error of the circuit transformer, thereby judging whether the electrical device is short-circuited. Such as figure 1 As shown, 101 represents the link of collecting various parameters of the current transformer in the electrical device, 102 represents the link of calculating the ratio difference and angle difference of the current transformer according to the ratio difference and angle difference of the current transformer, and 103 represents judging that the ...

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Abstract

The invention discloses a method for judging short circuit of an electrical device. The method comprises the following judging steps: step 1), collecting each parameter of a current transformer in the electrical device; step 2), calculating a ratio difference value and an angle difference value of the current transformer according to a ratio difference and an angle difference of the current transformer; step 3), judging the ratio difference value and the angle difference value of the current transformer during the normal operation and abnormal operation of the current transformer practically. The method for judging the short circuit of the electrical device disclosed by the invention is fast in judging speed and can make the calculation more accurate by on-line monitoring a parameter of the current transformer, so that the phenomenon of judge failure can be avoided.

Description

technical field [0001] The invention relates to a method for judging the short circuit of an electrical device. Background technique [0002] With the rapid development of the power grid, there are relatively mature protection measures for voltage levels of 110kV and above. The medium-voltage power distribution switchgear used in the plant within the voltage level range of 6kV (10kV) to 35kV is the power supply for the auxiliary equipment / power supply system of the whole plant. Hub, whether the fault can be quickly removed in the event of an internal fault is crucial to the safe operation of the power distribution system of the whole plant (substation), but according to the current protection scheme: in the power system, the busbars with a voltage level of 35kV and below are not Stability problem, generally no busbar protection is installed. However, due to the large number of outgoing lines on the medium and low voltage busbars, frequent operations, and the distance betwee...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
Inventor 丁心志刘柱揆许守东
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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