CN202651751U - Detection and protection system of electric appliance external surface electric leakage - Google Patents
Detection and protection system of electric appliance external surface electric leakage Download PDFInfo
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- CN202651751U CN202651751U CN 201120482689 CN201120482689U CN202651751U CN 202651751 U CN202651751 U CN 202651751U CN 201120482689 CN201120482689 CN 201120482689 CN 201120482689 U CN201120482689 U CN 201120482689U CN 202651751 U CN202651751 U CN 202651751U
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Abstract
The utility model provides a detection and protection system of electric appliance external surface electric leakage. The system is used for detecting and protecting the electric appliance external surface electric leakage caused by poor insulation of an electric appliance or a power supply wiring error. Through establishing a current channel (2) between an electrical appliance neutral line (N') and an electric external surface (G') and monitoring the size of current, the external surface electric leakage can be discovered without contacting the electric external surface (G') by a human body and the connection between electric appliance and a power supply can be cut off, and indication alarm is carried out. Through setting a power supply channel, in the condition of electric appliance and power supply wiring errors, an electric leakage protection system still can obtain a work power supply to work normally. According to a method and the system of the utility model, in the condition of electric appliance external surface floating, the electric appliance external surface electric leakage still can be discovered and the indication alarm is carried out or the connection between the electric appliance and the power supply can be cut off. The system has the advantages of simple and reliable structure, low cost, and capability of extensive application.
Description
Technical field the present invention relates to a kind of detection of electrical leakage means of defence and system, particularly relates to a kind of detection means of defence and system of electrical equipment appearance electric leakage.
In the use procedure of background technology household electrical appliance, owing to the reasons such as defective insulation or power supply wiring mistake may cause the electrical equipment appearance charged, if at this moment the user contacts appearance, then may cause electric current to flow to the earth through human body, cause casualties.Avoid casualties thereby the electrical equipment appearance reliably is connected with power ground or with conductor the direct ground connection of electrical equipment appearance can be directly imported the earth with the appearance electric leakage, but electrical equipment appearance good earth not in actual applications in many cases.
Many methods are arranged and be used for taking precautions against the harm that the electric leakage of electrical equipment appearance causes human body according to the earth leakage protective device that these methods are developed.The residual current operated protective device of CNS GB6829--86 " residual current operated protective device " and international standard IEC755 (1983) " General Requirements of aftercurrent action protecting equipment " regulation; adopted the method that detects residual current that electric leakage is protected; its principle is by elementary as current transformer of the power supply phase line of connecting circuit (three-phase or single-phase) and the neutral line; the phase line current that flows under normal circumstances instrument transformer equals to flow out the neutral current of instrument transformer; residual current is zero, and the secondary output voltage of the current transformer corresponding with primary current also is zero.When causing appearance charged owing to the defective insulation between power supply phase line and the electrical equipment appearance, if human body contacts with appearance, part phase line current will be through human body and the earth, but not the neutral line, return the power supply neutral point, so that the phase line current in the current transformer no longer equals neutral current, the secondary generation voltage of current transformer.This voltage process amplification driving circuit amplification rear drive executive circuit deenergization is connected with load, thereby has protected personal safety.But this method is under the complexity power supply environment, and it is charged to leak the electrical equipment appearance of coming from other power supply phase lines, because the leakage current of this moment is without current transformer, therefore the current transformer perception can not play protective action less than leakage current.Chinese patent ZL200520102796.8 " monolithic processor control device of the electrified washing-drying integral machine of transformer limited voltage ground wire " has provided another earth leakage protective device; its testing circuit is monitored the current potential of the neutral line and electrical equipment appearance with transformer and voltage comparator, thereby prevents the harm that the appearance electric leakage causes.But this method and apparatus connects the neutral line and electrical equipment appearance with transformer, when user mistake when intermodulation is connected with the neutral line with phase line, the phase line power supply can be connected to the electrical equipment appearance by transformer, the people is for causing appearance charged, if human body contact appearance, thereby the leakage current of the human body of flowing through may be greater than human-body safety electric current harmful to human.
Above-mentioned method and apparatus based on residual current detection will just trigger being connected of earth leakage protective device cut-out electrical equipment and power supply after the electrical equipment appearance of human body contact electrification produces shock current.If earth leakage protective device is because own fault and (for example 0.1 second) above-mentioned power supply of internal cutting off at the appointed time may cause the harm to human body.Above-mentioned method and apparatus based on current potential between the monitoring neutral line and the electrical equipment appearance does not limit the charged issuable leakage current of appearance that measuring circuit causes, and may cause the harm to human body yet.
Above-mentioned existing method and apparatus, mainly for the charged protection of electrical equipment appearance in power supply phase line and power supply neutral line connecting circuit phase line and the electrical equipment neutral line situation, do not consider such as owing to power supply phase line or the neutral line are connected to mistakenly possible the appearance that the faulty operation the appearance of electrical equipment causes and leak electricity.Simultaneously; the amplification executive circuit of above-mentioned existing method and apparatus all directly is connected to obtain working power with the power supply that is detected; leak electricity for the appearance that above-mentioned faulty operation causes; because false wiring causes the amplification executive circuit of earth leakage protective device to lose working power; even if so that test is charged to appearance, earth leakage protective device also can't be worked.
Summary of the invention the object of the invention is to overcome the formerly above-mentioned deficiency of method and apparatus, a kind of detection means of defence and system thereof of electrical equipment appearance electric leakage are proposed, even if power end do not have earth connection can with or the electrical equipment appearance do not have ground connection, no matter be that the appearance that causes of the wiring error between defective insulation causes between power supply and the electrical equipment appearance appearance charged or power supply and the electrical equipment is charged, can be in the electrical equipment neutral line and situation that the power supply neutral line is connected,, detect the charged situation of appearance and cut off the electricity supply and being connected of electrical equipment with before the electrical equipment appearance contacts at human body; Can in the situation of electrical equipment neutral line misconnection power supply phase line, when human body contacts with the electrical equipment appearance, produce predefined electric current, cut off the electricity supply and being connected of electrical equipment.Because this predefined electric current less than the human-body safety electric current, even if leakage protection system lost efficacy, can not cause personal injury yet.And this method and system can in various wiring situation, obtain working power from tested power supply.Principle of the present invention is: single-phase or three phase mains no matter, and in the correct wiring situation, power supply phase line L should circuit closer phase line L', and power supply neutral line N should circuit closer neutral line N', and power ground should circuit closer appearance G'.When above-mentioned wiring error and power ground disappearance, electrical equipment appearance G' does not have in the situation of ground connection, and the situation of possible false wiring has:
1. power supply phase line L circuit closer neutral line N', power supply neutral line N circuit closer phase line L'.This moment, electrical equipment appearance G' was not charged, and electrical equipment can be worked;
2. power supply phase line L circuit closer phase line L', power supply neutral line N circuit closer appearance G'.This moment, electrical equipment appearance G' was not charged, and electrical equipment can not be worked;
3. power supply phase line L circuit closer appearance G', power supply neutral line N circuit closer phase line L'.This moment, electrical equipment appearance G' was charged, and electrical equipment can not be worked;
4. power supply phase line L circuit closer neutral line N', power supply neutral line N circuit closer appearance G'.This moment, electrical equipment appearance G' was not charged, and electrical equipment can not be worked;
5. power supply phase line L circuit closer appearance G', power supply neutral line N circuit closer neutral line N'.This moment, electrical equipment appearance G' was charged, and electrical equipment can not be worked.
In above-mentioned 5 kinds of possible false wiring situations, 5 electrical equipment all can not be worked from situation 2 to situation, and wherein situation 3 and situation 5 have also caused appearance charged, therefore all should be protected.Be not difficult to find out that from situation 2 to situation 5, electrical equipment appearance G' has been connected among power supply phase line L and the neutral line N, a remaining power line is not to be connected with electrical equipment neutral line N', is exactly to be connected with electrical equipment phase line L'.That is to say if suitable current channel is set, 5, current direction electrical equipment appearance G' can arranged from situation 2 to situation.We can be with a current channel 1 electrical equipment neutral line N' of UNICOM and electrical equipment phase line L', and with a current channel 2 electrical equipment neutral line N' of UNICOM and electrical equipment appearance G', power supply was connected situation about connecting with electrical equipment under, current channel 2 did not have electric current; In 5 the various situations from situation 2 to situation, current channel 2 has current flowing, thereby by detecting the electric current of current channel 2, can detect situation 2 to the situation of situation 5, and then these erroneous condition of indication warning or cut off the electricity supply and being connected of electrical equipment, reach the purpose of detection of electrical leakage and protection.In addition; we are with power channel and the electrical equipment neutral line N' of amplification executive circuit by presetting of current leakage detection protection system; electrical equipment phase line L' and electrical equipment appearance G' are directly or indirectly link to each other; so that leakage protection circuit can both obtain working power in above-mentioned various false wiring situations, thereby overcome the above-mentioned deficiency of prior art.
Above-mentioned purpose of the present invention can realize by the following technical solutions.A kind of method of electrical equipment appearance detection of electrical leakage protection is proposed:
1, the electric current between the monitoring electrical equipment neutral line and the electrical equipment appearance.
If 2 find electric current between the electrical equipment neutral lines and the electrical equipment appearance greater than predetermined operating valve value, trigger and amplify executive circuit and report to the police being connected of indication or disconnection electrical equipment and power supply.
Said amplification executive circuit, by default power channel and the electrical equipment neutral line, the electrical equipment phase line is direct with the electrical equipment appearance or indirectly link to each other, to obtain required working power.
For realizing above-mentioned purpose of the present invention and electrical equipment appearance detection of electrical leakage means of defence, a kind of electrical equipment appearance detection of electrical leakage guard system is proposed:
A kind of detection of electrical leakage guard system has comprised testing circuit 3 and has amplified executive circuit 4, has also comprised one or more current channels and one or more power channel.
Described current channel comprises current channel 1 and current channel 2, the components and parts connecting circuit phase line L' of the negotiable electric current of current channel 1 usefulness and electrical equipment neutral line N', the components and parts connecting circuit neutral line N' of the negotiable electric current of current channel 2 usefulness and electrical equipment appearance G'; Adjust the parameter of components and parts in the current channel 2, so that when the voltage between electrical equipment neutral line N' and the electrical equipment appearance G' equaled between power supply phase line L and the power supply neutral line N voltage, the electric current between electrical equipment neutral line N' and the electrical equipment appearance G' was less than the human-body safety electric current.
Described testing circuit 3 comprises current transfer device, and its input current can comprise the electric current of the current channel 2 of flowing through; The electric current that also can comprise the current channel 2 of flowing through, the electric current of the electric current of the electrical equipment phase line of flowing through L' and the electrical equipment neutral line N' that flows through; Its output connects the input that amplifies executive circuit 4.
Described amplification executive circuit 4 can comprise one or more and amplify and the executive circuit unit, the signal of telecommunication can be amplified and being connected of cut-out electrical equipment and power supply.
Described power channel can be to comprise three-phase commutation bridge, and three ac input ends of rectifier bridge are circuit closer phase line L' respectively, electrical equipment neutral line N' and electrical equipment appearance G', and positive pole and the negative pole of rectifier bridge output connect respectively the positive-negative power that amplifies executive circuit 4; Also can be to comprise two or two above diodes, connect the amplification of amplification executive circuit 4 and the working power of executive circuit unit after the diode same polarity links to each other, all the other of diode are connecting pin not, a circuit closer appearance G', a circuit closer phase line L'; Also can be to comprise two wires, a circuit closer appearance G' of a conductor, a circuit closer neutral line N' of an other conductor, other one of two conductors connects the amplification of amplification executive circuit 4 and two working power ends of executive circuit unit; Can also be to comprise two or more wire windings that are wound on the same relay, a circuit closer phase line L' of a winding, one connects independent an amplification and executive circuit unit output, a circuit closer appearance G' of a winding, one connects that another one is independently amplified and executive circuit unit output.
Compare with technology formerly, the beneficial effect of the method and system of the invention described above is:
1. by the electric current of predetermined current passage and monitoring current passage, can before human body contacts appearance, find the electric leakage of electrical equipment appearance, and then report to the police or cut off the electricity supply, eliminate accident potential.
2. obtained the working power of earth leakage protective device under the false wiring condition by power channel is set, the electrical equipment appearance that false wiring causes so that protective device can be processed is charged;
3. by preseting the size of electric current between the electrical equipment neutral line and the electrical equipment appearance; so that in the situation of the power supply phase line misconnection electrical equipment neutral line and current leakage detection protection thrashing; the electric current that human body contact appearance produces can not cause injury to the people less than the human-body safety electric current.
4. float at electrical equipment, namely the electrical equipment appearance does not namely connect the power ground line, in the earth-free situation yet, still can correctly find the electric leakage of electrical equipment appearance and indication warning or cut off being connected of electrical equipment and power supply.
5. earth leakage protective device of the present invention is simple for structure, and is reliable and cost is low, can widely apply.
Description of drawings Fig. 1 is the schematic diagram of method of the present invention.
Fig. 2 is the electrical schematic diagram of most preferred embodiment 1 of the present invention, adopts the power channel of an amplification and executive circuit unit and three phase rectifier bridge construction.
Fig. 3 is the electrical schematic diagram of most preferred embodiment 2 of the present invention, adopts the power channel of an amplification and executive circuit unit and double diode structure.
Fig. 4 is the electrical schematic diagram of most preferred embodiment 3 of the present invention, adopts the power channel of an amplification and executive circuit unit and conductor structure.
Fig. 5 is the electrical schematic diagram of most preferred embodiment 4 of the present invention, adopts the power channel of two amplifications and executive circuit unit and double-winding structure.
Fig. 6 is the electrical schematic diagram of most preferred embodiment 5 of the present invention, and line current and electrical equipment neutral current are monitored mutually to current channel electric current and electrical equipment simultaneously.
Among the figure: current channel 1 current channel 2 testing circuits 3 amplify executive circuit 4 power channel 5
Embodiment is described in further detail the present invention below in conjunction with each accompanying drawing.
Fig. 1 is operating condition and the concrete steps of the inventive method.As shown in fig. 1, operating condition of the present invention is:
1. with current channel 1 connecting circuit phase line L' and electrical equipment neutral line N', with current channel 2 connecting circuit neutral line N' and electrical equipment appearance G'.
2. will amplify the direct or indirect joint of executive circuit 4 to electrical equipment appearance G' with power channel 5, electrical equipment appearance G' and electrical equipment phase line L'.
3. the electric current between default electrical equipment neutral line N' and the electrical equipment appearance G' makes it less than the human-body safety electric current.
Concrete grammar step of the present invention is:
1. monitor the electric current between the electrical equipment neutral line and the electrical equipment appearance;
2. if the electric current between the discovery electrical equipment neutral line and the electrical equipment appearance is greater than predefined operating valve value, immediately trigger alarm indication or disconnection electrical equipment are connected with power supply.
Embodiment 1:
Fig. 2 is the electrical schematic diagram of the embodiment 1 of system of the present invention.Wherein AC power AC is comprised of phase line L and neutral line N.Power supply AC is connected the normally closed switch J1 that can thread off and powers to the electrical equipment load with electrical equipment neutral line N' through electrical equipment phase line L'.Electrical equipment appearance G' floats.Current channel 1 is by rectifier bridge BR1, and resistance R 1 and LED 1 form.Two ac input ends of rectifier bridge BR1, a termination electrical equipment phase line L', a termination electrical equipment neutral line N'; Two dc output ends of rectifier bridge BR1 connect respectively the two ends of the series loop of R1 and LED1, and wherein R1 is current-limiting resistance, are 36K in this example; LED 1 is common light-emitting diode.When power supply phase line L was connected with electrical equipment neutral line N' with electrical equipment phase line L' with neutral line N, it is shinny that the average anode current of rectifier bridge BR1 drives LED 1 through R1, and the indication electric appliance load has been connected to power supply AC.Current channel 2 is by rectifier bridge BR2, and resistance R 2 and LED 2 form.Two ac input ends of rectifier bridge BR2, a termination electrical equipment neutral line N', an other end is through the elementary circuit closer appearance G' of current transformer TA; Two dc output ends of rectifier bridge BR2 connect respectively the series loop two ends of R2 and LED2, the value of R2 is so that the electric current between electrical equipment neutral line N' and the electrical equipment appearance G', voltage between electrical equipment neutral line N' and electrical equipment appearance G' equals in the situation of power supply AC voltage, less than human-body safety electric current (this example is less than 30 milliamperes).This routine R2 value is 33K.When power supply phase line L and neutral line N were connected to electrical equipment neutral line N' and electrical equipment appearance G' mistakenly, the ac input end of rectifier bridge BR1 lost AC power supplies, and LED 1 does not work, and current channel 1 does not have electric current; The ac input end of rectifier bridge BR2 obtains AC power supplies, and LED 2 is bright, current channel 2 generation currents, and triggering amplification executive circuit 4 cut-out electrical equipment are connected with power supply.Can not work and LED2 is bright judges power supply phase line L and neutral line N is connected to electrical equipment neutral line N' and electrical equipment appearance G' mistakenly according to LED1 thus.When power supply phase line L and neutral line N are connected to electrical equipment phase line L' and electrical equipment appearance G' mistakenly, the ac input end of rectifier bridge BR2 is connected to AC power supplies by current channel 1, current channel 2 generation currents, triggering amplification executive circuit 4 cut-out electrical equipment are connected with power supply.Because the power supply AC voltage that this moment, rectifier bridge BR2 and rectifier bridge BR1 were approximately equated separately, LED 2 is all bright with LED 1, and indication power supply phase line L and neutral line N are connected to electrical equipment phase line L' and electrical equipment appearance G' mistakenly.When power supply phase line L misconnection electrical equipment neutral line N' and power supply neutral line N misconnection electrical equipment phase line L', power supply phase line L voltage is delivered to the electrical equipment appearance by current channel 2, if at this moment human body contact electrical equipment appearance G' will cause power supply phase line L voltage to pass through by current channel 2, loop generation current passage 2 electric currents that human body and the earth form, trigger the detection of electrical leakage guard system cut off the electricity supply rapidly with being connected of electrical equipment (in this example the break time＜0.1S).Can't cut off the electricity supply just in case the detection of electrical leakage guard system loses efficacy, and because the electric current of current channel 2 is pre-arranged less than the human-body safety electric current, therefore also can not cause damage to human body.
Amplify executive circuit 4 and contain amplification and the executive circuit unit that is formed by controllable silicon amplification and control circuit and relay circuit.Wherein controllable silicon amplification and control circuit comprise resistance R 3, diode D1 and controllable silicon SCR.Resistance R 3 is connected in the triggering loop of controllable silicon SCR with the restriction trigger current; Diode D1 is in parallel with the trigger end of controllable silicon SCR to suppress reverse trigger voltage.Relay circuit comprises the relay J 1 of connecting with controllable silicon SCR.Controllable silicon in the present embodiment amplifies and control circuit, also available other integrated circuits, and for example the M54123 leakage protection circuit substitutes, and the function of realization is constant.
When charged or electrical equipment and power supply wiring mistake cause current channel 2 generation current as electrical equipment appearance G', the secondary generation voltage of the current transformer TA of testing circuit 3, trigger the controllable silicon SCR conducting, no matter this moment, power supply phase line L and power supply neutral line N were how connecting circuit phase line L' and electrical equipment neutral line N' and electrical equipment appearance G', electric current is always arranged from the power supply phase line L rectifier bridge 3BR that flows through, relay J 1 winding and controllable silicon SCR, then turn back to power supply neutral line N, the J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.
Because current channel 1 and current channel 2 have been connected to before relay J 1 switch, so that leakage protection system is in J1 action and cut off electrical equipment and be connected with power supply after the connection, light-emitting diode in the current channel still keep the reporting to the police reason of indicating status and indication fault: LED 1 is bright, LED 2 does not work, explanation is the electric leakage from power supply phase line L to electrical equipment appearance G', or power supply phase line L has caused the protection action with neutral line N reversal connection and there is the people to contact electrical equipment appearance G'; LED 1 does not work, and LED 2 is bright, and explanation is the phase line L of power supply and neutral line N' and the electrical equipment appearance G' that neutral line N misconnection has arrived electrical equipment, has caused the protection action; LED 1 and LED 2 are all bright, and explanation is the phase line L of power supply and phase line L' and the electrical equipment appearance G' that neutral line N misconnection has arrived electrical equipment, have caused the protection action.
Embodiment 2:
Fig. 3 is the electrical schematic diagram of the embodiment 2 of system of the present invention.Its power supply is connected connected mode and current channel 1 and current channel 2 structures and wiring with embodiment 1 with load; Difference is that power channel 5 comprises diode D2 and diode D3.Diode D2 and diode D3 same polarity are joined (this routine Anodic joins) and are connected to relay J 1 winding, the other utmost point connecting circuit appearance G' of diode D2, the other utmost point connecting circuit phase line L' of diode D3.When charged or electrical equipment and power supply wiring mistake cause current channel 2 generation current as electrical equipment appearance G', the secondary generation voltage of the current transformer TA of testing circuit 3, trigger the controllable silicon SCR conducting, if this moment, power supply phase line L and power supply neutral line N were connecting circuit phase line L' and electrical equipment neutral line N', electric current will be arranged from electrical equipment phase line L' process diode D3, relay J 1 winding and controllable silicon SCR arrive electrical equipment neutral line N', the J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.If this moment, power supply phase line L and power supply neutral line N were connecting circuit appearance G' and electrical equipment neutral line N', electric current will be arranged from electrical equipment appearance G' process diode D2, relay J 1 winding and controllable silicon SCR arrive electrical equipment neutral line N', the J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.If this moment, power supply phase line L and power supply neutral line N were connecting circuit phase line L' and electrical equipment appearance G', at this moment two-way electric current relay J 1 winding of flowing through will be arranged: one road electric current is from electrical equipment phase line L', through diode D3, relay J 1 winding and controllable silicon SCR arrive at and continue behind the electrical equipment neutral line N' to arrive electrical equipment appearance G' by current channel 2; Other one road electric current is from electrical equipment appearance G', and through diode D2, relay J 1 winding and controllable silicon SCR continue to arrive electrical equipment phase line L' by current channel 1 after arriving at electrical equipment neutral line N'; J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.Since relay J 1 in a short period of time (this example is＜just broken away from power supply after 0.1S) cutting off the electricity supply, so can in wider instantaneous current margin, work.
The indication warning meaning of the light-emitting diode of present embodiment is identical with embodiment 1.
Embodiment 3:
Fig. 4 is the electrical schematic diagram of the embodiment 3 of system of the present invention.Its power supply is connected connected mode and current channel 1 and current channel 2 structures and wiring with embodiment 1 with load; Difference is, wherein power channel 5 is two bar wires, a circuit closer appearance G' of a conductor, a circuit closer neutral line N' of an other conductor, other one of two conductors connects the amplification of amplification executive circuit 4 and two working power ends of executive circuit unit.Compare with embodiment 2 with embodiment 1, the amplification executive circuit 4 of present embodiment 3 directly obtains AC voltage in power supply phase line L and power supply neutral line N circuit closer neutral line N' and electrical equipment appearance G', in power supply phase line L and power supply neutral line N circuit closer phase line L' and electrical equipment appearance G', indirectly obtain AC voltage by current channel 1, the relay J 1 that therefore requires to amplify in the executive circuit 4 can be operated in wider current range.
The indication warning meaning of the light-emitting diode of present embodiment is identical with embodiment 1.
Embodiment 4:
Fig. 5 is the electrical schematic diagram of the embodiment 4 of system of the present invention.Its power supply is connected connected mode and current channel 1 and current channel 2 structures and wiring with embodiment 1 with load; Difference is that testing circuit 3 instrument transformer TA have two secondary outputs, trigger respectively two independently, and example 1 amplifies and drive circuit 4 similarly amplifies and the executive circuit unit.Two mutual disjunct windings that are wound on the same relay have served as power channel 5, a circuit closer appearance G' of a winding, one connects the switching circuit that is comprised of rectifier bridge BR3 controllable silicon SCR 1, a circuit closer phase line L' of another one winding, one connects the switching circuit that is comprised of rectifier bridge BR4 controllable silicon SCR 2.
When because the charged or electrical equipment of electrical equipment appearance G' and power supply wiring mistake when causing current channel 2 generation current, two secondary generation voltages of the current transformer TA of testing circuit 3 trigger respectively controllable silicon SCR 1 and controllable silicon SCR 2.If this moment, power supply phase line L and power supply neutral line N were connecting circuit phase line L' and electrical equipment neutral line N', electric current will be arranged from relay J 2 windings and rectifier bridge BR4 and the controllable silicon SCR 2 arrival electrical equipment neutral line N's of electrical equipment phase line L' process as power channel 5, the J2 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.If this moment, power line was connecting circuit appearance G' and electrical equipment neutral line N', electric current will be arranged from relay J 2 windings and rectifier bridge BR3 and the controllable silicon SCR 1 arrival electrical equipment neutral line N' of electrical equipment appearance G' process as power channel 5, J2 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.If this moment, power line was connecting circuit phase line L' and electrical equipment appearance G', at this moment flow through two windings of relay J 2 of two-way electric current will be arranged: one road electric current is from electrical equipment phase line L', continues to arrive electrical equipment appearance G' by current channel 2 after arriving at electrical equipment neutral line N' as relay J 2 winding of power channel 5 and rectifier bridge BR4 and controllable silicon SCR 2; Other one road electric current is from electrical equipment appearance G', through another relay J 2 windings and rectifier bridge BR3 and the controllable silicon SCR 1 as power channel 5, continues to arrive electrical equipment phase line L' by current channel 1 after arriving at electrical equipment neutral line N'; J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.
The indication warning meaning of the light-emitting diode of present embodiment is identical with embodiment 1.
Embodiment 5:
Fig. 6 is the electrical schematic diagram of the embodiment 5 of system of the present invention.Compare with other embodiment, the difference of embodiment 5 only is measuring circuit 3: the current transformer TA that comprises, and its primary current has not only comprised current channel 2 electric currents, and has comprised electrical equipment phase line L' electric current and electrical equipment neutral line N' electric current; Thereby so that cause when the phase line current that flows into instrument transformer TA is not equal to the neutral current of outflow instrument transformer TA when leaking electricity, can produce residual current and set up secondary voltage, triggering amplification executive circuit 4 disconnection electrical equipment are connected with power supply.The meaning of the testing process of 5 pairs of current channels 2 of embodiment and light-emitting diode warning indication no longer repeats as described in Example 1.
Present embodiment is equally applicable to the detection of electrical leakage protection that power supply is the electrical equipment of three phase mains, only needs the power supply phase line L that current transformer is elementary to substitute with the three-phase phase line and gets final product.
Claims (6)
1. the detection guard system of electrical equipment appearance electric leakage, inclusion test circuit (3) and amplify executive circuit (4) is characterized in that system also comprises one or more current channels and one or more power channel; Said testing circuit (3) comprises current transfer device, and its input current can comprise the electric current of the current channel of flowing through (2); Said current channel comprises current channel (1) and current channel (2); Current channel (1) is with components and parts connecting circuit phase line (L') and the electrical equipment neutral line (N') of negotiable electric current; Current channel (2) is with the components and parts connecting circuit neutral line (N') and the electrical equipment appearance (G') of negotiable electric current; Said power channel comprises three-phase commutation bridge, and three ac input ends of rectifier bridge are circuit closer phase line (L') respectively, the electrical equipment neutral line (N') and electrical equipment appearance (G'); Positive pole and the negative pole of rectifier bridge output connect respectively the positive-negative power that amplifies executive circuit (4).
2. electrical equipment appearance detection of electrical leakage guard system according to claim 1 is characterized in that the said electrical equipment neutral line (N') and electrical equipment appearance (G'), between electric current be predetermined to be less than the human-body safety electric current.
3. electrical equipment appearance detection of electrical leakage guard system according to claim 1, it is characterized in that said testing circuit (3) comprises current transfer device, its input current also can comprise the electric current of the current channel of flowing through (2), the electric current of the electric current of the electrical equipment phase line of flowing through (L') and the electrical equipment neutral line (N') that flow through; Its output connects the input that amplifies executive circuit (4).
4. electrical equipment appearance detection of electrical leakage guard system according to claim 1, it is characterized in that said power channel also can comprise two or two above diodes, after linking to each other, the diode same polarity connects the amplification of amplification executive circuit (4) and the working power of executive circuit unit, all the other of diode are connecting pin not, a circuit closer appearance (G'), a circuit closer phase line (L').
5. electrical equipment appearance detection of electrical leakage guard system according to claim 1, it is characterized in that said power channel also can comprise two wires, a circuit closer appearance (G') of a conductor, a circuit closer neutral line (N') of an other conductor, other one of two conductors connects the amplification of amplification executive circuit (4) and two working power ends of executive circuit unit.
6. electrical equipment appearance detection of electrical leakage guard system according to claim 1, it is characterized in that said power channel also can comprise two or more wire windings that are wound on the same relay, a circuit closer phase line (L') of a winding, one connects independent an amplification and executive circuit unit output, a circuit closer appearance (G') of a winding, one connects that another one is independently amplified and executive circuit unit output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201120482689 CN202651751U (en) | 2011-11-12 | 2011-11-12 | Detection and protection system of electric appliance external surface electric leakage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120482689 CN202651751U (en) | 2011-11-12 | 2011-11-12 | Detection and protection system of electric appliance external surface electric leakage |
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| CN202651751U true CN202651751U (en) | 2013-01-02 |
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| CN 201120482689 Expired - Fee Related CN202651751U (en) | 2011-11-12 | 2011-11-12 | Detection and protection system of electric appliance external surface electric leakage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009448A (en) * | 2013-02-23 | 2014-08-27 | 吴伟 | Novel leakage protection method and novel leakage protection device with live and neutral wire identification function |
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2011
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009448A (en) * | 2013-02-23 | 2014-08-27 | 吴伟 | Novel leakage protection method and novel leakage protection device with live and neutral wire identification function |
| WO2014128562A3 (en) * | 2013-02-23 | 2015-02-26 | Wu Wei | New leakage protection method and device having live/neutral wire identification function |
| AU2014220405B2 (en) * | 2013-02-23 | 2018-02-22 | Wei Wu | New leakage protection method and device having live/neutral wire identification function |
| US9941685B2 (en) * | 2013-02-23 | 2018-04-10 | Wei Wu | Leakage protection method and device having live/neutral wire identification function |
| CN104009448B (en) * | 2013-02-23 | 2018-04-24 | 吴伟 | A kind of the new pattern creepage means of defence and device of band fire zero curve identification function |
| GB2525566B (en) * | 2013-02-23 | 2019-04-03 | Wu Wei | New leakage protection method and device having live/neutral wire identification function |
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