CN102637982B

CN102637982B - There is the plug of ground wire live protection mechanism

Info

Publication number: CN102637982B
Application number: CN201210008875.7A
Authority: CN
Inventors: 钱加灿
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-01-12
Filing date: 2012-01-12
Publication date: 2017-11-17
Anticipated expiration: 2032-01-12
Also published as: CN102637982A

Abstract

There is the plug of ground wire live protection mechanism, phase line L including each belt switch, zero line N, the poles of ground wire E tri-, through phase line L, zero line N zero sequence current mutual inductor, hookup, electrical apparatus release, rectification circuit, controllable silicon, also set up a transformer, amplifying circuit and another controllable silicon, primary coil one end of transformer is connected with ground wire E, the primary coil other end of transformer is connected after concatenating big resistance current limliting reduction voltage circuit with zero line N, the secondary coil of transformer and the input of amplifying circuit connect, the output end of amplifying circuit is connected with the trigger electrode of another controllable silicon, another SCR control electrical apparatus release action.It can ensure that ground wire live trip voltage is not more than safe voltage, prevent because there is induced voltage to make plug malfunction and false alarm in ground wire.

Description

There is the plug of ground wire live protection mechanism

Technical field

The present invention relates to a kind of electrization protection device, more particularly to a kind of earth wire live protector.

Background technology

The existing plug with earth wire live protector, such as all-purpose leakage protection plug, generally refer to fill in protection Put（Plug）It can disconnect when phase zero line leaks electricity, can be disconnected when being also included within ground wire electrification, it is generally comprised by dynamic tactile bullet Property piece and stationary contact connection phase, zero, three poles, the zero sequence current mutual inductor through phase, zero line, test loop, amplification Circuit, rectifier, controllable silicon, electrical apparatus release, the zero sequence current mutual inductor through ground wire, it is except between detection load phase, zero line Whether there is outside leakage current, also detect whether ground wire has leakage current by when phase line, zero line or ground wire separately or concurrently leak During electric current, two detection coils can all make electrical apparatus release immediately by phase, zero, ground wire it is all off, that is, cut off the electricity supply, so as to effectively Ground has ensured personal safety, therefore has been widely applied in household electrical appliance.

The security of ground wire electrification, validity are prevented in order to strengthen all-purpose leakage protection plug, the applicant develops in succession The all-purpose leakage protection plug of a variety of ground wire live trips, adds contact with alarm of charged ground wire circuit, passes through a variety of detection ground wires The cooperation of powered detection mode such as neon lamp and light-sensitive element, alarm can be produced in ground wire electrification, prompt user to take Measure, electrical equipment is stopped using, so as to further increase the security performance of leakage protecting plug.

But above-mentioned all-purpose leakage protection plug also talented following weak point：1st, when ZCT on utilization ground wire When detecting electric current, the electric current on user's ground wire is extremely complex, and electric current is easily produced between the earth causes mistrip.

2nd, when neon lamp and light-sensitive element coordinate detection ground wire voltage, the starting voltage of neon lamp is more than 70V, so can not The trip protection in safe voltage.

The content of the invention

The technical problems to be solved by the invention are to overcome the drawbacks described above of prior art and be provided with earth wire charged protecting The plug of mechanism, it can be cut off the electricity supply rapidly when ground wire electrification exceeds safe voltage.

Technical scheme is used by the present invention solves above-mentioned technical problem：

There are the plug of ground wire live protection mechanism, including the phase line L of each belt switch, zero line N, the poles of ground wire E tri-, through phase line L, zero line N zero sequence current mutual inductor, hookup, electrical apparatus release, rectification circuit, controllable silicon, a transformer, amplification are also set up Circuit and another controllable silicon, primary coil one end of transformer are connected with ground wire E, the primary coil other end string of transformer It is connected after connecing big resistance current limliting reduction voltage circuit with zero line N, the secondary coil of transformer and the input of amplifying circuit connect, amplification The output end of circuit is connected with the trigger electrode of another controllable silicon, another SCR control electrical apparatus release action.

Preferably：The iron core of above-mentioned transformer is annular, and primary coil is wound on the side of annular core, and secondary coil is wound on The opposite side of annular core, so can be high pressure resistant.

Preferably：Above-mentioned current-limiting circuit is insulaion resistance or electric capacity.

Preferably：Above-mentioned zero line N, ground wire E input between connect induced voltage elimination circuit.

Preferably：Above-mentioned zero line N, ground wire E input between connect ground wire electrification indicating circuit.

Applicant have also found that the primary coil in present patent application can be also arranged on to the zero of original earth leakage protective device In sequence current transformer, during using original secondary coil, when ground wire electrification, the zero-sequence current that is connected between zero line and ground wire Electric current is produced in primary winding of mutual inductor and voltage is induced in secondary coil goes triggering control silicon to lead after control circuit is amplified Electricity and drive electrical apparatus release thread off tripping operation.When ground strip voltage and leakage current simultaneously in the presence of, the sensing of zero sequence electricity transformer secondary The voltage gone out will have two kinds of results：1）Ground wire electrification voltage and the leakage current caused magnetic field in zero sequence current mutual inductor For same polarity when, the voltage of the now secondary output of zero sequence current mutual inductor is both phase making alives.Now earth leakage protective device has It may trip or will be tripped in leakage current very little when ground wire electrification voltage is very low, easily produce malfunction, do not meet It is required that.2) caused polarity of the magnetic field is to inverse time in zero sequence current mutual inductor for ground wire electrification voltage and leakage current, now zero sequence The voltage of secondary transformer output subtracts each other voltage for both.Now earth leakage protective device is possible in ground wire electrification voltage very Trip or can just be tripped when leakage current is very big when high, danger will be caused to the person.

And in actual use, general family particularly rural subscribers seldom install ground wire, are fitted without the electricity consumption of ground wire Device overwhelming majority shell can be with the presence of induced voltage.General electrical equipment has certain leakage current, especially with of long duration Electrical appliance, so ground wire electrification and the simultaneous possibility of leakage current are very big, therefore, or mistrip, or tripping operation It is preceding just user is got an electric shock, it can not meet to require.

Compared with prior art, the advantage of the invention is that：

Due to setting transformer between zero line and the input of ground wire, thus ensuring that ground wire live trip voltage is little In safe voltage.

Also by zero line N, ground wire E input between connect induced voltage elimination circuit, prevent because of thoughts in ground wire Voltage is answered to make plug malfunction and false alarm.

Brief description of the drawings

Fig. 1 is the circuit diagram of the embodiment of the present invention.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing embodiment.

As shown in figure 1, have the plug of ground wire live protection mechanism, including belt switch K phase line L, zero line N, ground wire E tri- Pole, through phase line L, zero line N zero sequence current mutual inductor ZCT2, hookup R3, K1, electrical apparatus release, rectification circuit D1-D4, can It is original circuit for electric leakage protector to control silicon SCR2, and zero sequence current mutual inductor ZCT2 pushes directly on controllable silicon SCR 2 by electrical apparatus release L1 Triggering electrical apparatus release action and make linked switch S1, S2 act, in original leakage protection circuit increase a transformer ZCT1, Amplifying circuit IC and another controllable silicon SCR 1, dropping resistor R1, R2, induced voltage eliminate electric capacity C1, band electric alarm neon bulb H.

Transformer ZCT1 primary coil one end concatenate the both ends after valued resistor R2 one big and zero line N, ground wire E it is defeated Enter end connection, transformer ZCT1 secondary coil is connected with amplifying circuit IC input, amplifying circuit IC output end and can Silicon SCR1 trigger electrode connection is controlled, controllable silicon SCR 1 controls electrical apparatus release L1 actions, so that linked switch S1, S2 are acted.

Above-mentioned big valued resistor R2 resistance should make circuit meet insulating requirements.

Above-mentioned big valued resistor R2 can also be replaced with electric capacity.

Dropping resistor R4 is set using voltage according to amplifying circuit IC.

Neon bulb H, current limliting dropping resistor R1 series connection be followed by above-mentioned zero line N, ground wire E input between be used as ground wire electrification Indicating circuit, will light neon bulb H when ground strip piezoelectric voltage reaches neon bulb H ignition voltages, represent that ground wire is powered, can be with Warn user.If zero line N and live wire L are reversed, and ground wire E and the endless all insulation in ground, it can also be produced between zero line N, ground wire E Voltage and make earth leakage protective device tripping operation and neon bulb light alarm, avoid zero line N and live wire L reversed, under wiring normality lack of standardization Use electrical equipment.

Above-mentioned zero line N, ground wire E input between connection electric capacity C1 do induced voltage elimination circuit, electric capacity C1 is using handing over The principle that enough turns on of stream electric energy, can eliminate because ground wire E does not enter ground and on ground wire E caused by induced voltage, so as to lead Cause mistrip.

When ground wire E is powered, voltage is just had between zero line N and ground wire E, the transformation being connected between zero line N and ground wire E Just there is electric current to flow through in device ZCT1 primary coil, its secondary coil can be induced after the amplified IC circuit of voltage is amplified to controllable Silicon SCR1 trigger electrodes trigger controlled silicon conducting and make electrical apparatus release thread off make linked switch S1, S2 act and disconnect phase line L, zero line N, The poles of ground wire E tri-, so as to which plug powers off.Now the voltage between zero line N and ground wire E reaches neon bulb H ignition voltages, is connected to zero line Neon bulb H between N and ground wire E will be lit, and represent that ground wire E is powered and alarms.

Shunt capacitance C2, above-mentioned electric capacity C2 are gone back between original zero sequence current mutual inductor ZCT2 output ends can improve anti-interference Ability.

Controllable silicon SCR 2 is damaged in order to prevent moment reverse high voltage from entering the trigger electrode of controllable silicon SCR 2, in above-mentioned zero sequence Current transformer ZCT2 output end parallel diode D5, diode D5 negative pole are connected with resistance R5 one end, diode D5's Positive pole is connected with the negative pole of controllable silicon SCR 2

Above-mentioned transformer ZCT1 parallel connection of secondary windings one regulation resistance R, regulation resistance R can change zero line N, ground wire E Between tripping voltage.

Above-mentioned transformer passes through first, secondary coil number of turn proportioning, just makes dropout when safe voltage is exceeded in ground wire voltage Device trips.

Claims

1. there is the plug of ground wire live protection mechanism, including the phase line L of each belt switch, zero line N, the poles of ground wire E tri-, through phase line L, Zero line N zero sequence current mutual inductor, hookup, electrical apparatus release, rectification circuit, controllable silicon, it is characterised in that：Also set up a change Depressor, amplifying circuit and another controllable silicon, primary coil one end of transformer are connected with ground wire E, the primary line of transformer The circle other end is connected after concatenating big resistance current limliting reduction voltage circuit with zero line N, the input of the secondary coil and amplifying circuit of transformer End connection, the output end of amplifying circuit are connected with the trigger electrode of another controllable silicon, another SCR control electrical apparatus release action.

2. the plug as claimed in claim 1 for having ground wire live protection mechanism, it is characterised in that：Described big resistance current limliting drop Volt circuit is insulaion resistance or electric capacity.

3. the plug as claimed in claim 1 or 2 for having ground wire live protection mechanism, it is characterised in that：Described transformer Iron core is annular, and primary coil is wound on the side of annular core, and secondary coil is wound on the opposite side of annular core.

4. the plug as claimed in claim 1 or 2 for having ground wire live protection mechanism, it is characterised in that：Described zero line N, Induced voltage elimination circuit is connected between line E input.

5. the plug as claimed in claim 4 for having ground wire live protection mechanism, it is characterised in that：Described induced voltage eliminates Circuit is electric capacity.

6. the plug as claimed in claim 1 or 2 for having ground wire live protection mechanism, it is characterised in that：Described zero line N, Ground wire electrification indicating circuit is connected between line E input.

7. the plug as claimed in claim 6 for having ground wire live protection mechanism, it is characterised in that：Described ground wire electrification instruction Circuit is that neon bulb is in series with a resistor.

8. the plug as claimed in claim 1 or 2 for having ground wire live protection mechanism, it is characterised in that：Described transformer One regulation resistance of parallel connection of secondary windings.

9. the plug as claimed in claim 3 for having ground wire live protection mechanism, it is characterised in that：The secondary of described transformer One regulation resistance of coils from parallel connection of coils.

10. the plug as claimed in claim 4 for having ground wire live protection mechanism, it is characterised in that：Time of described transformer Level one regulation resistance of coils from parallel connection of coils.