CN201118276Y

CN201118276Y - Earth leakage circuit-breaker inverse transmission preventing device

Info

Publication number: CN201118276Y
Application number: CNU2007200138638U
Authority: CN
Inventors: 孙志明
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-15
Filing date: 2007-08-15
Publication date: 2008-09-17
Anticipated expiration: 2017-08-15

Abstract

The utility model discloses an anti- reverse power supply device of a leakage switch. The power is connected with a release TK via an amplification and control circuit, which is connected with one group of secondary coils L <1> of a current transformer. One circuit of the other group of secondary coils, i.e. testing coils L <2>, of the current transformer is connected with a working voltage end directly, and the other circuit is connected with the working voltage end via a resistor R and an test button connected in series. A middle relay KA is arranged at a working voltage incoming end of an emergency generator unit in an external circuit, and is provided with a pair of normally-closed contacts KA <-1> arranged at the power side and the working voltage end. A normally-opened contact KA <-2> of the relay is connected with the test button in parallel. The other pair of normally-opened KA <-3> are arranged at the emergence power side and the working voltage end. When the generator unit of the customer works, the anti-reverse power supply circuit will keep working to effectively prevent the reverse power supply. The device is provided with the high reliability and the simple structure, and can be restructured easily.

Description

Leakage switch prevent anti-power transmission device

Technical field

The utility model relate to a kind of user's of preventing house generator behind system blackout to system counter send the electricity device.

Background technology

Along with rapid economy development, the situation of user's house generator increases rapidly, and when the supply line of electric company maintenance, transformation or other reasons occurred and need have a power failure, the user was for guaranteeing the continuity of self electricity consumption, and can start power autonomous is generator.When the power autonomous startup of user, and do not disconnect 10 kilovolt distribution transformer height, in the time of low-side switch and user's battery main switch, user's generator is by the boosting of distribution transformer, carry 10 kilovolts of high voltages to electric company's 10 kilovolt, when the circuit of electric company is overhauling, because the influence of factors such as dry weather, cause the ground connection of circuit installing bad, therefore high pressure appears in the circuit that can cause overhauling, establish well even the line-to-ground of 10 kilovolts of maintenance is traditional thread binding, also very high induced electromotive force can appear on the line, this induced voltage can hurt the maintainer, install unstable the time when earth connection, consequence can be more serious.Therefore for safety, prevent that from the source user's is power autonomous very necessary to the anti-electricity that send of 10 kilovolt.

Summary of the invention

The purpose of this utility model is to provide a kind of anti-power transmission device that prevents of leakage switch, and it is used to realize that with leakage switch inside earth leakage protective circuit improves, make the user provide engine start for oneself the time and system disconnect, guarantee system safety.

The technical solution of the utility model is as follows:

This device power supply is connected release through amplifying with control circuit, this circuit connects one group of secondary coil of current transformer, another group secondary coil of current transformer is that testing coil one tunnel directly connects the operating voltage end, and another road connects the operating voltage end through resistance, the experiment button of series connection; Insert the operating voltage end in external circuit house generator group and add an auxiliary relay, this relay has a pair of normally-closed contact to be added in mains side and operating voltage end, normally opened contact of relay is in parallel with above-mentioned test button, and another is added in power autonomous side of user and operating voltage end to normally opened contact.

Advantage of the present utility model is: 1, this device is under the situation of user's generating set work, the circuit of anti-" counter sending " is worked all the time, cause the release connecting rod to reset, therefore under the situation of user's generating set work, battery main switch can not be closed, and can stop user's " counter sending " effectively.2, reliability height, because of install the normally-closed contact of auxiliary relay additional at mains side, when user's generating set is started working, the auxiliary relay adhesive, normally-closed contact disconnects earlier, and is closed behind the normally opened contact, and normally-closed contact disconnects operating voltage end and mains side are cut off, and eliminate mains side with the user influencing each other between power autonomous, guarantee the personnel's that working at this moment safety.3, simple in structure, repacking easily, the Circuits and Systems junction adds auxiliary relay outside, if installing additional, leakage switch prevents the counter function of sending electricity before production is dispatched from the factory, auxiliary relay adopts small-sized auxiliary relay, it is installed in the inside of leakage switch, outwards only need draws 1 pair of terminal, be used to connect 220 volts of power autonomous interchange inputs of user and get final product.When needs were transformed existing equipment, each user only need buy a plain edition auxiliary relay, a terminal board and the part flexible cord with 8 pairs of terminals, can realize preventing the counter function of sending electricity by the back panel wiring that changes leakage switch.

Description of drawings

Fig. 1 is former gfci circuit schematic diagram;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

Can see by Fig. 1, leakage switch originally portion within it has a current transformer H, by four loop currents that lead is total in the current transformer detection three-phase four-wire power supply mode, when circuit has the people to get an electric shock or the electric leakage situation of other modes when taking place (electric leakage: the phase current of certain phase by human body or other electric conductors and the earth as the loop), cause the total current value in the three-phase and four-line supply power mode of leakage switch non-vanishing, therefore at the internal current instrument transformer secondary coil L of leakage switch ₁In induced current output is arranged, this electric current amplifies through amplifying circuit, and with the control circuit acting in conjunction, cause the charged adhesive of release TK coil, drive the tripping operation actuating strut TKG action of leakage switch, drive leakage switch K tripping, thereby cut off the electricity supply.For whether the creepage protection function of checking leakage switch is intact, whether intact the leakage switch spy be provided with one and be used for the user and detect its leakage function test button K _SWhen leakage switch when the mains side that closes the position and the switch tool of leakage switch has voltage, press C that " test button " test voltage generally is connected on the three-phase and four-line circuit mutually and zero mutually between, just having test current to flow through in testing coil is artificial leakage current of manufacturing, this test current causes having in the internal current instrument transformer of leakage switch induced current to flow out, this electric current amplifies through amplifying circuit, and with the control circuit acting in conjunction, cause the charged adhesive of trip coil, drive the tripping operation actuating strut action of leakage switch, drive the leakage switch tripping, thereby cut off the electricity supply.

Can see structure of the present utility model by Fig. 2, this device power supply is connected release TK through amplifying with control circuit, and this circuit connects the secondary coil L of current transformer H ₁, another secondary coil L of current transformer H ₂Be that testing coil one tunnel directly connects the operating voltage end, another road is through resistance R, the test button K of series connection _SConnect the operating voltage end; Insert the operating voltage end in external circuit house generator group and add an auxiliary relay KA, this relay has a pair of normally-closed contact KA _-1Be added in mains side and operating voltage end, normally opened contact KA of relay _-2In parallel with above-mentioned test button, another is to normally opened contact KA _-3Be added in power autonomous side of user and operating voltage end; Power line passes punching current transformer H, and FH is a load side, and K is a leakage switch, K ₁Be the power autonomous switch of user, TKG is the tripping operation actuating strut.

This device realizes preventing the anti-electric principle of sending:

When the mains side V of leakage switch has rated voltage, pressing test button K _SThe time, leakage switch K just can move tripping.Therefore install merely hit a relay and a terminal board additional, realize preventing the counter function of sending electricity of user with " 8 pairs " terminal.220 volts of AC power that the coil power of auxiliary relay uses user's house generator to send.And the normally opened contact by auxiliary relay is outwards exported 220 volts of alternating voltages, as the working power of leakage switch protective circuit.One normally opened contact KA of auxiliary relay _-2Be connected in parallel on test button K _STwo ends, the function of replacement test button.When the power autonomous startup of user, when the line side leakage switch does not have to disconnect, have 400 volts of alternating voltages of three-phase and four-line at the upside of user's switch tool, so the charged adhesive of auxiliary relay KA coil, the amplification and the control circuit of leakage switch have operating voltage, and normally opened contact KA _-2Connect simultaneously, cause the release action jointly, thereby drive the tripping operation actuating strut action of leakage switch, drive the leakage switch tripping, realized preventing that the user is to the counter function of sending electricity of circuit.Use a pair of normally-closed contact of auxiliary relay to be serially connected on the former protection power supply of leakage switch, eliminate the influence that brings between two groups of protection power supplys.

This protective circuit reliability diagram:

When the circuit of electric company is powered to the user, battery main switch is when closing, and user's power autonomous switch can not close the position.Because if battery main switch and user's power autonomous switch is closing the position simultaneously, output (being the input of the power autonomous switch of user) at user's house generator group three-phase and four-line voltage has 400 volts of voltages of three-phase and four-line, the circuit of anti-" counter sending " will be worked the deenergization master switch.Therefore when electric company when the user powers, user's power autonomous switch must opened the position, can the power turn-on master switch.

When the line outage of electric company, battery main switch is closing the position, and user's power autonomous switch is being opened the position, after user's starter-generator group, the circuit of anti-" counter sending " is just started working the deenergization master switch, user's power autonomous switch that closes again uses electric set electric supply.Under the situation of user's generating set work, the circuit of anti-" counter sending " is worked all the time, causes the release connecting rod to reset, and therefore under the situation of user's generating set work, battery main switch can not be closed.Therefore the generation of having stopped user's " counter sending " phenomenon effectively.

Claims

1, a kind of leakage switch prevent anti-power transmission device, it is characterized in that: to be power supply be connected release TK, one group of secondary coil L of this circuit connection current transformer through amplifying with control circuit for it ₁, another group secondary coil of current transformer is testing coil L ₂One the tunnel directly connects the operating voltage end, and another road is through resistance R, the experiment button K of series connection _SConnect the operating voltage end; Insert the operating voltage end in external circuit house generator group and add a relay K A that merely hits, this relay has a pair of normally-closed contact KA _-1Be added in mains side and operating voltage end, normally opened contact KA of relay _-2In parallel with above-mentioned test button, another is to normally opened contact KA _-3Be added in power autonomous side of user and operating voltage end.