CN203310951U - Pulse current line selection apparatus with intelligent module - Google Patents

Abstract

The utility model discloses a pulse current line selection apparatus with an intelligent module. The pulse current line selection apparatus is characterized by comprising a circuit board, a bus, a branch, a zero sequence current transformer, a wireless control system and a controller, wherein the bus, the branch, the zero sequence current transformer, the wireless control system and the controller are distributed on the circuit board; the controller is electrically connected with the secondary side of the zero sequence current transformer on the branch; the output terminal of the controller is electrically connected with the gate of a controlled silicon and a controlled silicon trigger is series connected therebetween; the controlled silicon is series connected between the neutral point of a grounding transformer and the ground; the grounding transformer is in electrical connection with the bus which is connected with the branch; a current transformer is in bridge connection between the bus and ground; the secondary side of the current transformer is electrically connected with the input terminal of the controller; a first fuse and an isolation switch are series connected between the grounding transformer and the bus; a second fuse is series connected between the current transformer and the bus; and the isolation switch is series connected between the second fuse and the bus. The pulse current line selection apparatus with the intelligent module can rapidly and accurately determines the branch where a grounding fault occurs.

Description

A kind of pulse current route selection device with intelligent object

Technical field

The utility model relates to a kind of line selection apparatus, especially a kind of pulse current route selection device with intelligent object.

Background technology

In the not directly grounded system of the 3～66KV of China neutral point, singlephase earth fault is a kind of common fault.When singlephase earth fault occurs, because system triple-phase line electric current still keeps balance, so electric power system still can normally be worked.According to the relevant regulations of safe operation of power system, neutral point is not during solidly grounded system generation singlephase earth fault, and system is the longest can power two hours, so the planted agent finds as soon as possible fault branch and processes in time during this period.For this reason, people have installed zero sequence current mutual inductor on the branch road of electric system, and the secondary side of all zero sequence current mutual inductors is electrically connected to controller.During by the detection single-phase earthing, flow through the size and Orientation of the capacitance current of each branch road, judge the branch road that earth fault occurs, as the ground fault line selection device used online.But, this ground fault line selection device exists weak point, at first, the accuracy rate of route selection is low, its cause is when system generation singlephase earth fault, though the size of the zero sequence capacitance current of earth fault branch road is the vector of other branch road zero sequence capacitance currents, but still too small, add the various disturbing factors that exist in signals transmission, cause the accuracy rate of route selection to be difficult to guarantee; Secondly, even determined the branch road that earth fault occurs, yet ground connection has occurred and but still can not determine in which in fault branch mutually.

The utility model content

The technical problems to be solved in the utility model is for overcoming above-mentioned defect, when a speciogenesis earth fault is provided, and its branch road and equal confirmable pulse current route selection device mutually.

For solving technical matters of the present utility model, the technical scheme adopted is:

A kind of pulse current route selection device with intelligent object, comprise wiring board, and distribution bus, branch road, zero sequence current mutual inductor, wireless control system, controller in the circuit board, described controller is electrically connected to the zero sequence current mutual inductor secondary side on branch road; The output terminal of described controller is electrically connected to the silicon controlled gate pole, and between be serially connected with silicon controlled toggle; Described controllable silicon is serially connected with between the neutral point and ground of grounding transformer; Described grounding transformer is electrically connected to the bus that is connected with branch road; Between described bus and ground, cross-over connection has current transformer; The secondary side of described current transformer is electrically connected to the input end of controller; Between described grounding transformer and bus, be serially connected with the first fuse and disconnector; Between described current transformer and bus, be serially connected with the second fuse; Between described the second fuse and bus, be serially connected with disconnector; In described controller, intelligent object is set; Described intelligent object comprises a microprocessor, and this microprocessor is connected with respectively LCD display circuit, A/D change-over circuit, failure indicating circuit, output driving circuit, keyboard control circuit and signal input circuit; Described A/D change-over circuit is connected with three-phase voltage input sampling circuit, three-phase current input sampling circuit, pressure transducer input sampling circuit, temperature sensor input sampling circuit and speed pickup input sampling circuit.

Beneficial effect with respect to prior art is, employing is on the basis of the controller that the zero sequence current mutual inductor secondary side with on branch road is electrically connected to, in between bus and ground, be connected in series grounding transformer and controllable silicon again, and current transformer, wherein, controllable silicon is serially connected with between the neutral point and ground of grounding transformer, its gate pole is electrically connected to the output terminal of controller, the technical scheme that the secondary side of current transformer is electrically connected to the input end of controller, make as long as singlephase earth fault occurs, zero-sequence current when controller just can first obtain the generation singlephase earth fault by the current transformer place, therefore and trigger controlled silicon conducting, make neutral point and fault branch all flow through stronger zero-sequence current, thereby determined, be that what branch road reaches the earth fault that how to have occurred mutually wherein.This branch road that can determine quickly and accurately generation earth fault, can determine quickly and accurately simultaneously the technical scheme of the phase that the earth fault branch road occurs again, bring great convenience for the processing of fault, shortened widely the time of fault handling, made user's Electrical Safety obtain reliable assurance.

As the further embodiment of beneficial effect, the one, between the output terminal of controller and silicon controlled gate pole, preferably be serially connected with silicon controlled toggle, not only be beneficial to the workload that alleviates controller, also be easy to controllable silicon is accurately controlled; The 2nd, between grounding transformer and bus, preferably be serially connected with the first fuse and disconnector, between current transformer and bus, preferably be serially connected with the second fuse, between the second fuse and bus, preferably be serially connected with disconnector, all be beneficial to the grounding transformer summation current transformer is effectively protected and is convenient to it is carried out to daily servicing; The 3rd, controller is preferably microcomputer or digital signal processor, except being easy to programming, also has versatility, characteristics that user interface is good.

The accompanying drawing explanation

Figure l is a kind of basic structure schematic diagram of the present utility model.

Embodiment

Referring to figure l, a kind of pulse current route selection device with intelligent object, comprise wiring board, and distribution bus 1, branch road 2, zero sequence current mutual inductor 3, wireless control system 12, controller 6 in the circuit board, described controller 6 is electrically connected to zero sequence current mutual inductor 3 secondary sides on branch road; The output terminal of described controller 6 is electrically connected to the gate pole of controllable silicon 7, and between be serially connected with silicon controlled toggle 5; Described controllable silicon 7 is serially connected with between the neutral point and ground of grounding transformer 8; Described grounding transformer 8 is electrically connected to the bus 1 that is connected with branch road 2; Between described bus 1 and ground, cross-over connection has current transformer 4; The secondary side of described current transformer 4 is electrically connected to the input end of controller 6; Between described grounding transformer 8 and bus 1, be serially connected with the first fuse 9 and disconnector 11; Between described current transformer 4 and bus 1, be serially connected with the second fuse 10; Between described the second fuse 10 and bus 1, be serially connected with disconnector 11; The interior intelligent object 12 that arranges of described controller 6; Described intelligent object 12 comprises a microprocessor, and this microprocessor is connected with respectively LCD display circuit, A/D change-over circuit, failure indicating circuit, output driving circuit, keyboard control circuit and signal input circuit; Described A/D change-over circuit is connected with three-phase voltage input sampling circuit, three-phase current input sampling circuit, pressure transducer input sampling circuit, temperature sensor input sampling circuit and speed pickup input sampling circuit.

When the utility model normally moved in system, the neutral point current of grounding transformer 8 was zero or only has very low out-of-balance current, controllable silicon 7 not conductings.When system generation singlephase earth fault, the neutral point current of grounding transformer 8 raises as phase current.The zero-sequence current that current transformer 4 now will be exported a larger generation singlephase earth fault is sent to controller 6, by controller 6, trigger rapidly controllable silicon 7 conductings, and utilize controllable silicon 7 from turn-off function, make system only in half power frequency period of 10ms, be operated in the neutral-point solid ground state, thereby make neutral point and fault branch all flow through stronger zero sequence current signal.Zero sequence current mutual inductor 3 on fault branch is uploaded to controller 6 after this stronger zero sequence current signal being detected, controller 6 is according to the output of the zero sequence current mutual inductor 3 on current transformer 4 and fault branch, and determining is that what branch road reaches the earth fault that how to have occurred mutually wherein.

Obviously, those skilled in the art can carry out various changes and modification and not break away from spirit and scope of the present utility model pulse current route selection device of the present utility model.Like this, if of the present utility model these are revised and within modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model also is intended to comprise these changes and modification interior.

Claims (1)

1. pulse current route selection device with intelligent object, it is characterized in that: comprise wiring board, and distribution bus, branch road, zero sequence current mutual inductor, wireless control system, controller in the circuit board, described controller is electrically connected to the zero sequence current mutual inductor secondary side on branch road; The output terminal of described controller is electrically connected to the silicon controlled gate pole, and between be serially connected with silicon controlled toggle; Described controllable silicon is serially connected with between the neutral point and ground of grounding transformer; Described grounding transformer is electrically connected to the bus that is connected with branch road; Between described bus and ground, cross-over connection has current transformer; The secondary side of described current transformer is electrically connected to the input end of controller; Between described grounding transformer and bus, be serially connected with the first fuse and disconnector; Between described current transformer and bus, be serially connected with the second fuse; Between described the second fuse and bus, be serially connected with disconnector; In described controller, intelligent object is set; Described intelligent object comprises a microprocessor, and this microprocessor is connected with respectively LCD display circuit, A/D change-over circuit, failure indicating circuit, output driving circuit, keyboard control circuit and signal input circuit; Described A/D change-over circuit is connected with three-phase voltage input sampling circuit, three-phase current input sampling circuit, pressure transducer input sampling circuit, temperature sensor input sampling circuit and speed pickup input sampling circuit.

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