CN2452191Y - Electric power circuit one-phase grounding trouble automatic alarming device - Google Patents

Abstract

The utility model provides an electric power circuit one-phase grounding fault automatic alarming device, which is formed by that a zero sequence voltage type leakage voltage mutual inductor is connected with a rectifying and filter circuit, and then the rectifying and filter circuit is connected with an electrical level transferring circuit which is then connected with an amplifying drive circuit, and the amplifying drive circuit is then connected with an acoustic-optic alarm circuit; the output terminals of the amplifying drive circuit can also be connected with a cordless transmitting circuit which can be matched with a cordless accepting synchronous alarm system. The utility model has the advantages of novel structure, reliable performance, and convenient operation. The utility model is suitable for 1.14KV and 0.66KV three-phase power distribution systems having indirectly grounded neutral points, and is a novel power circuit fault automatic monitoring, indicating, and alarming device.

Description

Power circuit single phase ground fault autoalarm

The utility model relates to a kind of indicating device that observes and predicts of power circuit fault, the indicating alarm device of arbitrary phase line earth fault in especially a kind of three phase mains circuit.

Develop rapidly along with modern science and technology; for promoting improving constantly of industrial technology; 1.14KV, the not directly grounded distribution system of 0.66KV three-phase neutral point have been adopted at electric power equipments such as oil, mining industries; because this distribution system neutral point through puncturing insurance ground connection, can be protected personal safety effectively and improve anti-electricity-theft ability.But when system continues operation when a phase line ground connection is taken place, then can cause people and animals to endanger damage with power consumption equipment, have the hidden danger defective again if occur another phase line fault again.In known technology; the three-phase four-wire system distribution system that existing power circuit faulty indication warning device such as Fuse Type power supply protector, capacitance-resistance type fault indication alarm etc. are primarily aimed at 380V neutral-point solid ground designs, and is not suitable for 1.14KV, the not directly grounded distribution system of 660V three-phase neutral point.Therefore, need development single phase ground fault indicating alarm device correspondingly.

The purpose of this utility model provides the not power circuit single phase ground fault indicating alarm device of direct earthed distribution system of a kind of 1.14KV of being applicable to, 660V three-phase neutral point, it can realize when power circuit generation single phase ground fault that in time indication is reported to the police, its novel structure, easy to use.

The utility model realizes that the solution of above-mentioned purpose is: adopting primary side instrument transformer star connection, secondary side instrument transformer is after the residual voltage formula electrical leakage voltage instrument transformer of open-delta tie lines connects behind the current rectifying and wave filtering circuit more in succession level shifting circuit, connect sound light alarming circuit after connecting amplification driving circuit again, the power circuit single phase ground fault autoalarm that consists of.Be to be fitted with three external connections on the instrument transformer on this warning device.During use, 3 external connections of this warning device are connected on the power supply triple line.When the arbitrary phase line generation single phase ground fault of power circuit, grounded phase wire voltage descends, and (when the dead ground fault took place, voltage rose but not grounded phase wire voltage rises

Doubly), the zero sequential potential transformer that is connected transfers to current rectifying and wave filtering circuit with single-phase earthing voltage rising signal with it, the signal of telecommunication through rectifying and wave-filtering is undertaken being delivered to amplification driving circuit after the level conversion by level shifting circuit again, through its actuator of amplification driving circuit power amplifier rear drive, with the power connection of sound light alarming circuit, send the single phase ground fault alarm signal.

For adapting to mains terminals (as the distribution transformer end) and power consumption equipment end apart from each other, same power supply institute logotype electricity equipment is many and disperse, as oil-field oil pumper etc., and need send the alerting of power supply generation single phase ground fault simultaneously at two ends, the utility model is radio transmitter in parallel with sound light alarming circuit behind its amplification driving circuit, echo mutually with radio transmitter and supporting to connect by 74150 types or other passage expanded circuit of forming of function phase plesiotype integrated circuit with it by wireless receiving circuit in addition, the synchronous warning system of wireless receiving formed of sound light alarming circuit in succession again behind the output connection amplification driving circuit of passage expanded circuit.When single phase ground fault generation alarm signal appearred in power end, electricity consumption load end elsewhere also received and sends alarm signal.

Because the monitoring of zero sequential potential transformer as power supply phase line ground connection adopted in the utility model design, by connecting level shifting circuit again behind the zero sequential potential transformer connection current rectifying and wave filtering circuit, with the power supply signal of instrument transformer output after rectifying and wave-filtering carries out level conversion, connect amplification driving circuit by level shifting circuit output and connect sound light alarming circuit, the power circuit single phase ground fault autoalarm of being formed by its actuator.And, can also set up the synchronously remote two-way and even multidirectional warning system of wireless transmission and reception according to using needs.It is applicable to the not direct earthed distribution system of 1.14KV, 0.66KV three-phase neutral point, show through test for several times, the utility model can carry out the automatic monitoring warning of power circuit single phase ground fault effectively, have novel structure, reasonable in design, performance is safe and reliable, advantage such as easy to install, is that a kind of novel power circuit fault is monitored indicating alarm device automatically.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is a block diagram of the present utility model.

Fig. 2 is the basic circuit diagram of the utility model embodiment.

As shown in Figure 1, the utility model comprises: electrical leakage voltage instrument transformer (1), current rectifying and wave filtering circuit (2), level shifting circuit (3), amplification driving circuit (4) and sound light alarming circuit (5).Electrical leakage voltage instrument transformer (1) is to be the zero sequential potential transformer of open-delta tie lines by primary side instrument transformer star connection, secondary side instrument transformer, the output line of instrument transformer (1) connects current rectifying and wave filtering circuit (2), the output of current rectifying and wave filtering circuit (2) connects level shifting circuit (3), the output of level shifting circuit (3) connects signal amplification driving circuit (4), and the output of amplification driving circuit (4) connects sound light alarming circuit (5).

Referring to accompanying drawing 1 embodiment, the utility model is also at the output and sound light alarming circuit (5) radio transmitter in parallel (6) of the amplification driving circuit (4) of above-mentioned warning device, echoes mutually with radio transmitter (6) supporting to connect the synchronous warning system of wireless receiving that sound light alarming circuit (10) is formed again after connecting amplification driving circuit (9) again by wireless receiving circuit (7) interface channel expanded circuit (8) in addition.

Embodiment as shown in Figure 2, the electrical leakage voltage instrument transformer (1) of this power circuit accident warning device is 3 instrument transformer H of primary side _1-3Star connection, 3 instrument transformer H of secondary side _4-6Another and connect capacitor C for the open-delta tie lines ₁The zero sequential potential transformer that ground connection is formed, 3 input link U, V of instrument transformer (1), W also are that 3 external connections of this warning device are equipped with three-phase power line in succession, and the output line of instrument transformer (1) connects current rectifying and wave filtering circuit (2); Current rectifying and wave filtering circuit (2) is the electric bridge D by bridge rectifier _1-4Filter capacitor C in parallel _2-3And resistance R ₁Form, the output of current rectifying and wave filtering circuit (2) connects level shifting circuit (3); Level shifting circuit (3) is by LM339 or LM324 type or other type integrated circuit U ₁Connect adjustable resistance W ₁And resistance R ₂Form, the output of level shifting circuit (3) connects amplification driving circuit (4); Amplification driving circuit (4) is by power discharging transistor Q ₁Its base stage connects resistance R ₃, collector connection relay J ₁With diode D ₅Form, actuator's output of amplification driving circuit (4) connects respectively by light-emitting diode D ₆, current-limiting resistance R ₄, loud speaker SP ₁Connect sound light alarming circuit of being formed (5) and the radio transmitter of forming by T5W type or other type transmitting set FS (6).Wireless receiving circuit (7) in the synchronous warning system of wireless receiving is made up of T5W type or other type radio receiver JS, corresponding 74150 types or other the close functional form integrated circuit U of connecting of the output interface of wireless receiving circuit (7) ₂Form passage expanded circuit (8), the output pin of passage expanded circuit (8) connects amplification driving circuit (9); Amplification driving circuit (9) is by power discharging transistor Q ₂, relay J ₂With diode D ₇Institute connects to form, and the output of amplification driving circuit (9) connects by light-emitting diode D ₇, current-limiting resistance R ₅With loud speaker SP ₂Connect the sound light alarming circuit of being formed (10).

According to concrete use needs, also can echo the synchronous warning system of supporting wireless receiving mutually with power end radio transmitter (6), consist of two-way and even multidirectional power circuit single phase ground fault radio alarming device in a plurality of power load end installings of same power supply.

Claims (5)

1, a kind of power circuit single phase ground fault autoalarm, it comprises sound light alarming circuit, it is characterized in that also comprising electrical leakage voltage instrument transformer (1), current rectifying and wave filtering circuit (2), level shifting circuit (3), amplification driving circuit (4), electrical leakage voltage instrument transformer (1) is the instrument transformer star connection of primary side, the secondary side instrument transformer is the zero sequential potential transformer of open-delta tie lines, 3 incoming lines of instrument transformer (1) are the external connection of this alarm, the output line of instrument transformer (1) connects the current rectifying and wave filtering circuit (2) that the power supply signal of instrument transformer input is carried out rectifying and wave-filtering, the output of current rectifying and wave filtering circuit (2) connects the level shifting circuit (3) with the electrical signal levels conversion, connected the amplification driving circuit (4) of level shifted signal through its actuator of amplification rear drive by level shifting circuit (3) output, the output by amplification driving circuit (4) connects sound light alarming circuit (5) again.

2, power circuit accident warning device according to claim 1, it is characterized in that output and sound light alarming circuit (5) radio transmitter in parallel (6) at amplification driving circuit (4), with radio transmitter (6) echo mutually in addition connect amplification driving circuit (9) again by wireless receiving circuit (7) interface channel expanded circuit (8) after connect the synchronous warning system of wireless receiving that sound light alarming circuit (10) is formed again.

3, power failure warning device according to claim 1 is characterized in that electrical leakage voltage instrument transformer (1) is 3 instrument transformer H of primary side _1-3Be star connection, 3 instrument transformer H of secondary side _4-6For the open-delta tie lines connects capacitor C in the lump ₁The zero sequential potential transformer that ground connection is formed, current rectifying and wave filtering circuit (2) are the electric bridge D by bridge rectifier _1-4Filter capacitor C in parallel _2-3And resistance R ₁Form, level shifting circuit (3) is by LM339 or LM324 type integrated circuit U ₁Connect adjustable resistance W ₁And resistance R ₂Form, amplification driving circuit (4) is by power discharging transistor Q ₁Base stage connects resistance R ₃, collector connection relay J ₁With diode D ₅Form, sound light alarming circuit (5) is by light-emitting diode D ₆, current-limiting resistance R ₄With loud speaker SP ₁Connect to form.

4, power circuit accident warning device according to claim 2, it is characterized in that radio transmitter (6) is the transmitting set FS of T5W type, wireless receiving circuit (7) is the radio receiver JS of T5W type, and passage expanded circuit (8) is 74150 type integrated circuit U ₂, amplification driving circuit (9) is by power discharging transistor Q ₂, relay J ₂With diode D ₇Connect to form, sound light alarming circuit (10) is by light-emitting diode D ₇, current-limiting resistance R ₅With loud speaker SP ₂Connect to form.

5, power failure warning device according to claim 4 is characterized in that being consisted of by the synchronous warning system of wireless receiving that several and radio transmitter (6) echo mutually two-way to multidirectional power circuit single phase ground fault radio alarming device.

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