Method and device for monitoring ground fault of overhead line
A ground fault and overhead line technology, applied in the field of distribution network systems, can solve the problems of increased possible fault points, inconvenient on-site use, and increased system cost, and achieve the effects of improving social production efficiency, improving work efficiency, and ensuring power supply security.
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Embodiment 1
[0028] figure 1 This is a flowchart of a method for monitoring ground faults of overhead lines provided by Embodiment 1 of the present invention. Such as figure 1 As shown, it mainly includes the following steps:
[0029] Step 11. Simultaneously measure the current increase vector of phase a, b and c in the three-phase current of the distribution network in the time period △t versus
[0030] For overhead lines of 10kV and above, when there is no fault in normal operation, the three-phase balance current vector diagram is as follows figure 2 Shown.
[0031] At time t, if there is no fault, the three phases (a, b, and c) are balanced, and the vector sum of the three-phase current can be expressed as: Ia ‾ ( t ) + Ib ‾ ( t ) + Ic ‾ ( t ) = 0 ;
[0032] When a ground fault occurs in the system, the three-phase balance current is broken, and the vector sum of the three-phase current is expressed as: among them, Is the zero sequen...
Embodiment 2
[0056] Figure 4 This is a schematic diagram of a device for monitoring ground faults of overhead lines provided in the second embodiment of the present invention. Such as Figure 4 As shown, mainly include:
[0057] The current increase vector measuring unit 41 is used to synchronously measure the current increase vector of phases a, b and c in the time period △t in the three-phase current of the distribution network versus
[0058] The ground fault judgment unit 42 is used to calculate the versus Vector sum If If the threshold is set, the three-phase current is balanced, and it is determined that the current line has no ground fault; otherwise, the three-phase current is unbalanced, and it is determined that a ground fault occurs.
[0059] The ground fault judgment unit calculates the versus Vector sum Realized by the vector sum formula construction unit, and the vector sum formula construction unit is specifically used to increase the vector according to the current vers...
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