CN211606072U - Electric leakage detection protection device - Google Patents
Electric leakage detection protection device Download PDFInfo
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- CN211606072U CN211606072U CN201921644503.7U CN201921644503U CN211606072U CN 211606072 U CN211606072 U CN 211606072U CN 201921644503 U CN201921644503 U CN 201921644503U CN 211606072 U CN211606072 U CN 211606072U
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Abstract
The utility model discloses an earth leakage detection protection device, include: an induction element disposed at a position close to the ground line and disposed in non-contact with the ground line; the protection switch is provided with two paths which are respectively arranged on a live wire and a zero wire; the input end of the amplifying circuit is connected with the sensing element, and the output end of the amplifying circuit outputs a control signal for controlling the conducting state of the protection switch; and the power supply module is used for supplying power to the amplifying circuit. The utility model discloses an electric leakage detection protection device, through setting up induction element in the position department that is close to the ground wire, its alternating current field around can the perception, when taking place the ground wire electric leakage, no matter it switches on and forms the return circuit, all can send alternating current field to the space, when having alternating current field around induction element, can produce the sensing signal, it is very sensitive and accurate to the electric leakage detection of ground wire, the detection principle of this scheme does not need leakage current to form the return circuit, the application scope of detection is more extensive, avoid taking place the condition of hourglass inspection.
Description
Technical Field
The utility model belongs to the technical field of the earth leakage detection, specifically speaking relates to an earth leakage detection protection device.
Background
When the electric leakage occurs, the live wire is generally connected with the ground wire, so that the ground wire is electrified. If the ground is good, the electricity generated will be conducted to the ground without danger. At present, a household generally sets an air switch for protecting a main switch circuit, the protection principle is to detect the current on a live wire and a zero line, when the short-circuit current is larger than the normal load current, the switch is disconnected for protection, the premise is that a current loop is formed by a leakage part and the ground, the short-circuit current can be generated, if the ground wire is not well connected to the ground, the short-circuit current or the short-circuit current is small, the switch cannot be disconnected for protection, and the leakage part has the danger of electric shock for a human body.
A plurality of electrical appliances are generally arranged in a household, and because the household electrical appliances share the ground wire, when the ground wire is electrified, electric leakage can be conducted into all the electrical appliances through the ground wire, and the electric shock risk is improved.
Disclosure of Invention
The utility model discloses to current leakage detection device leakage detection have when the ground wire does not normally be connected with the earth to leak the technical problem who examines, provide a leakage detection protection device, can solve above-mentioned problem.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:
an electrical leakage detection protection device comprising:
an induction element disposed at a position close to a ground line and disposed in non-contact with the ground line;
the protection switch is provided with two paths which are respectively arranged on a live wire and a zero wire;
the input end of the amplifying circuit is connected with the induction element, and the output end of the amplifying circuit outputs a control signal for controlling the conducting state of the protection switch;
and the power supply module is used for providing power supply for the amplifying circuit.
Further, the electromagnetic induction device further comprises a shielding case, wherein a part of the ground wire and the induction element are enclosed in the shielding case, and the shielding case is used for shielding an electric field outside the shielding case.
Further, the induction element is a metal pickup sheet or an induction coil.
Furthermore, the amplifying circuit comprises a first switch circuit and a voltage dividing circuit, one end of the voltage dividing circuit is connected with the power module, the other end of the voltage dividing circuit is connected with the ground through the first switch circuit, and the sensing signal generated by the sensing element is used for controlling the conduction state of the first switch circuit.
Furthermore, the amplifying circuit further comprises a second switch circuit, one end of the second switch circuit is connected with the power module, the other end of the second switch circuit is connected with the control end of the first switch circuit, and the control end of the second switch circuit is connected with the sensing element.
Furthermore, a filter capacitor is connected in parallel to two ends of the first switch circuit.
Further, the first switching circuit is a first NPN triode, the second switching circuit is a second NPN triode, a collector of the first NPN triode is connected to the voltage dividing circuit, an emitter of the first NPN triode is connected to ground, a base of the second NPN triode is connected to the sensing element, a collector of the second NPN triode is connected to the power supply, and an emitter of the second NPN triode is connected to the base of the first NPN triode.
Further, the amplifying circuit is an integrated operational amplifier.
Furthermore, the shielding case comprises a metal shielding layer and an insulating layer, wherein the metal shielding layer is positioned on the inner side, and the insulating layer is positioned on the outer side.
Further, the leakage detection protection device further includes:
one path of the control module is connected with the output end of the amplifying circuit, and the other path of the control module is connected with the control end of the protection switch;
a wireless communication module connected with the control module.
Compared with the prior art, the utility model discloses an advantage is with positive effect: the utility model discloses an electric leakage detection protection device, through setting up induction element in the position department that is close to the ground wire, its alternating current field around can the perception, when taking place the ground wire electric leakage, be equivalent to the ground wire and be connected with the 220V alternating current, no matter it switches on and forms the return circuit, all can send alternating current field to the space, when having alternating current field around induction element, can produce the sensing signal, it is very sensitive and accurate to the electric leakage detection of ground wire, the detection principle of this scheme does not need leakage current to form the return circuit, the application scope of detection is more extensive, avoid taking place the condition of hourglass detection.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the leakage detection protection device of the present invention;
FIG. 2 is a schematic diagram of the principle of leakage inductance of FIG. 1;
fig. 3 is a schematic block diagram of an embodiment of an amplifying circuit of the inductive leakage detecting device of the present invention;
fig. 4 is a circuit schematic diagram of an embodiment of the amplification circuit of fig. 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the first embodiment, the commercial power provides 220V alternating current for users through the power grid, the users can be household power users and commercial power users, no matter what the nature of the users, the zero line and the live line of the users are respectively connected to the commercial power grid, the building is generally provided with a total ground wire row, the ground wire row is connected with the ground, the ground wires of all the users of the building are connected to the ground wire row, if the ground wire is normally connected with the ground wire row, when electric leakage occurs, the leakage current is led into the ground through the ground wire, no harm is caused to human bodies, and meanwhile, the leakage current is generated, the current protection switch performs disconnection protection by detecting the leakage current, however, if the ground wire cannot be normally connected with the ground wire row, the ground wire is electrified, the human bodies have electric shock risks, and no leakage current exists, the leakage cannot be detected by the current leakage detection device, based on this, the present embodiment provides a leakage detection protection device, as shown in fig. 1 and fig. 2, the leakage detection protection device includes a sensing element 11, a protection switch 12, an amplifying circuit 13 and a power module 14, wherein the sensing element 11 is disposed at a position close to a ground PE and disposed in a non-contact manner with the ground PE, the protection switch 12 has two paths and is disposed on a live line L and a zero line N, respectively, an input end of the amplifying circuit 13 is connected to the sensing element 11, an output end outputs a control signal for controlling a conducting state of the protection switch 12, and the power module is configured to provide a power supply for the amplifying circuit 13. The inductive element 11 can sense the surrounding alternating electric field and generate an inductive signal. Normally, the ground wire PE is at zero potential, i.e., does not radiate an electric field to the space, when the ground wire PE leaks electricity, an alternating voltage is applied to the ground wire PE, and the ground wire PE may conduct the electricity leakage to the inner container, water in the inner container, the outer shell, the water pipe joint made of metal, the metal hanger, the wall and the like, or even transmit the electricity leakage to other electrical appliances connected with the ground wire along with the ground wire. When electric water heater takes place the ground wire electric leakage, be equivalent to ground wire PE and 220V alternating current connection, no matter it switches on and forms the return circuit, all can send alternating current electric field to the space, when having alternating current electric field around the inductive element, can produce the sensing signal, it is very sensitive and accurate to the electric leakage detection of ground wire, the detection principle of this scheme does not rely on the current balance of live wire and zero line, also need not to require leakage current to form the return circuit, the application scope of detection is more extensive, avoids taking place the condition of lou examining. The detected leakage signal is amplified and then used to control the protection switch 12 to turn off the main switch. Non-contact sets up between induction element 11 and the ground wire PE, when ground wire PE has the electric leakage, its electric field to space radiation just can be detected by induction element 11, can prevent simultaneously that ground wire PE direct contact induction element 11, lead to high-voltage alternating current to cause the damage to induction type electric leakage detection device, in addition, can also prevent that the ground wire PE that has the electric leakage from continuing to transmit electricity to this electric leakage detection device, lead to having increased a electric leakage point, and then increase the risk of electrocution.
The protection switch 12 of the leakage detection protection device of this embodiment is preferably installed at the main switch of the power supply, and a certain distance may be left between the live wire, the zero line and the ground wire at this position, so as to conveniently set the leakage detection protection device, and at the same time, advantageously reduce the interference of the live wire and the zero line to the sensing element, when the leakage protection occurs, the main switch of the power supply may be turned off to protect all the electrical appliances connected with the main switch, the setting position of the sensing element 11 is not limited, as long as it can be close to the ground wire, and the position of the sensing element 11 is set, in order to prevent the live wire and the zero line from causing interference to the sensing element 11, the ground wire has a certain space with the live wire and the zero line respectively, but still cannot completely avoid the interference of the live wire and the zero line to the leakage detection protection device, and to avoid the misjudgment caused by the interference of, the leakage detection protection device in this embodiment further includes a shielding case 15, a part of the ground wires and the sensing element 11 are enclosed in the shielding case 15, the shielding case 15 is used for shielding an electric field outside the shielding case 15, and preventing an interference electric field from entering the shielding case 15, the sensing element 141 generates misjudgment to ensure that it can only sense an alternating current electric field of the ground wires inside the shielding case 15, the shielding case 15 can be implemented by a good metal conductor with an internal hollow shell, the shielding case 15 can be connected to the ground by an independent wire, by grounding the shielding case 15, an equal amount of positive charges induced by the external alternating current electric field on the surface of the shielding case 15 are discharged along the grounding wire to enter the ground plane, and a power line generated by an external alternating current electric field source can be shielded outside the shielding case.
The sensing element 11 can be realized by adopting a metal pickup sheet or an induction coil, but is not limited to the above-mentioned implementation scheme, the detected body can be wholly or partially sealed in the shielding case 15, the sensing element 11 and the detected body are arranged in a non-contact way, the two are arranged in a non-contact way, when the detected body has electric leakage, the electric field radiated to the space can be detected by the sensing element 11, and meanwhile, the detected body can be prevented from directly contacting the sensing element 11, so that high-voltage alternating current can damage the sensing type electric leakage detection device, in addition, the detected body with the electric leakage can be prevented from continuously transmitting the electric to the electric leakage detection device, so that an electric leakage point is increased, and further, the electric shock risk is increased.
The amplifying circuit 13 is configured to amplify a small signal sensed by the sensing element 11 to a state that can be identified by the control module or can control the alarm module to generate an alarm, preferably, in this embodiment, as shown in fig. 3, the amplifying circuit 13 includes a first switch circuit and a voltage dividing circuit, one end of the voltage dividing circuit is connected to the power module, the other end of the voltage dividing circuit is connected to ground through the first switch circuit, the power module is configured to provide a dc operating voltage VCC for the voltage dividing circuit, a signal output terminal LDJC of the amplifying circuit 13 is disposed between the voltage dividing circuit and the first switch circuit, a sensing signal generated by the sensing element 11 is configured to control a conducting state of the first switch circuit, when no electric leakage occurs, the sensing element 11 does not sense a signal, and therefore, the first switch circuit is not conducting, a conducting loop is not formed between the corresponding dc operating voltage VCC and ground, and a signal state output by the signal output terminal ld, when the leakage occurs, the sensing element 11 generates a sensing signal, when the voltage of the sensing signal is enough to turn on the first switch circuit, the first switch circuit is turned on, a conduction loop is formed between the corresponding direct current working voltage VCC and the ground, the signal output end LDJC has signal output, and the state of the signal output by the signal output end LDJC changes, which indicates the leakage. The signal can be directly used for controlling the alarm module to give an alarm, and can also be sent to the control module, and the control module takes further protective measures, such as cutting off a power supply and the like.
In order to improve the stability and the driving capability of the amplifying circuit 13, the amplifying circuit 13 further includes a second switch circuit, one end of the second switch circuit is connected to the power module, the other end of the second switch circuit is connected to the control end of the first switch circuit, and the control end of the second switch circuit is connected to the sensing element. The sensing element 11 generates a sensing signal for controlling the on-state of the first switch circuit, when the sensing signal generated by the leakage drives the first switch circuit to be on, the dc working voltage VCC output by the power module can be directly loaded on the first switch circuit through the second switch circuit, the second switch circuit is on, the state of the signal output by the signal output terminal LDJC changes, which indicates the leakage, or no leakage occurs.
In order to eliminate the interference wave introduced by the inductive element 11, the two ends of the first switch circuit are also connected with a filter capacitor C2 in parallel, so that the accuracy of the back-end detection judgment is improved.
As shown in fig. 4, the first switch circuit and the second switch circuit are respectively implemented by using an NPN transistor, and the voltage dividing circuit is implemented by using a voltage dividing resistor R1, where the first switch circuit is a first NPN transistor N1, the second switch circuit is a second NPN transistor N2, a collector of the first NPN transistor N1 is connected to the voltage dividing resistor R1, an emitter of the first NPN transistor N1 is connected to ground, a base of the second NPN transistor N2 is connected to the sensing element 11, a collector of the second NPN transistor N2 is connected to the power supply, and an emitter of the second NPN transistor N2 is connected to a base of the first NPN transistor N1. When the induced signal generated by the leakage reaches the turn-on voltage of the second NPN triode N2, the second NPN triode N2 is turned on, the base of the first NPN triode N1 is connected to the power supply module through the second NPN triode N2, and accordingly the first NPN triode N1 is turned on, and the state of the signal output by the signal output terminal LDJC changes, which indicates the leakage.
Of course, the amplifying circuit 13 is not limited to the above-mentioned components, and may be implemented by an integrated operational amplifier, besides the above-mentioned switch circuit.
In order to improve the control reliability of the on-state of the protection switch 12, it is preferable that the leakage detection protection device further includes a control module 16, one path of the control module 16 is connected to the output terminal of the amplifying circuit 13, and the other path is connected to the control terminal of the protection switch 12, the control module 16 can improve the resolution accuracy of the sensing signal sensed by the sensing element 11, and accurately control the on-off state of the protection switch 12, and the protection switch 12 can be implemented by a relay.
The control module is connected with a communication module and used for sending out the leakage signal in a wired or wireless mode, for example, the leakage signal can be sent to a mobile terminal device of a user for prompting through wireless communication.
The shield case 15 includes at least a metal shield layer and an insulating layer (not shown), wherein the metal shield layer is located on the inner side and the insulating layer is located on the outer side. The metal shielding layer is a closed or approximately closed metal shell or a metal mesh enclosure, the metal shielding layer plays a role in shielding an external electric field, the insulating layer plays a role in insulating the metal shielding layer from an external structure, and particularly for external metal parts, the metal shielding layer is prevented from conducting electricity to the metal shielding layer when the external structure is electrified, so that an internal circuit is damaged, and leakage detection is caused due to electric leakage caused by abnormal induction.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.
Claims (10)
1. An electrical leakage detection protection device, comprising:
an induction element disposed at a position close to a ground line and disposed in non-contact with the ground line;
the protection switch is provided with two paths which are respectively arranged on a live wire and a zero wire;
the input end of the amplifying circuit is connected with the induction element, and the output end of the amplifying circuit outputs a control signal for controlling the conducting state of the protection switch;
and the power supply module is used for providing power supply for the amplifying circuit.
2. The earth leakage detection protection device of claim 1, further comprising a shielding enclosure, wherein a portion of the ground line and the inductive element are enclosed within the shielding enclosure, the shielding enclosure being configured to shield an electric field external thereto.
3. The earth leakage detection protection device according to claim 1, wherein the inductive element is a metal pickup plate or an inductive coil.
4. The earth leakage detection protection device according to claim 1, wherein the amplifying circuit comprises a first switch circuit and a voltage dividing circuit, one end of the voltage dividing circuit is connected to the power module, the other end of the voltage dividing circuit is connected to ground through the first switch circuit, and the sensing signal generated by the sensing element is used for controlling a conducting state of the first switch circuit.
5. The device according to claim 4, wherein the amplifying circuit further comprises a second switch circuit, one end of the second switch circuit is connected to the power module, the other end of the second switch circuit is connected to the control terminal of the first switch circuit, and the control terminal of the second switch circuit is connected to the sensing element.
6. The earth leakage detection protection device according to claim 4, wherein a filter capacitor is further connected in parallel to two ends of the first switch circuit.
7. The leakage detection protection device according to claim 5, wherein the first switching circuit is a first NPN transistor, the second switching circuit is a second NPN transistor, a collector of the first NPN transistor is connected to the voltage dividing circuit, an emitter of the first NPN transistor is connected to ground, a base of the second NPN transistor is connected to the sensing element, a collector of the second NPN transistor is connected to a power supply, and an emitter of the second NPN transistor is connected to the base of the first NPN transistor.
8. The earth leakage detection protection device of claim 1, wherein the amplifier circuit is an integrated op amp.
9. The earth leakage detection protection device of claim 2, wherein said shielding enclosure comprises a metallic shielding layer and an insulating layer, said metallic shielding layer being located on the inside and said insulating layer being located on the outside.
10. An earth leakage detection protection device according to any one of claims 1-8, characterized in that said earth leakage detection protection device further comprises:
one path of the control module is connected with the output end of the amplifying circuit, and the other path of the control module is connected with the control end of the protection switch;
a wireless communication module connected with the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921644503.7U CN211606072U (en) | 2019-09-29 | 2019-09-29 | Electric leakage detection protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921644503.7U CN211606072U (en) | 2019-09-29 | 2019-09-29 | Electric leakage detection protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211606072U true CN211606072U (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921644503.7U Active CN211606072U (en) | 2019-09-29 | 2019-09-29 | Electric leakage detection protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211606072U (en) |
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2019
- 2019-09-29 CN CN201921644503.7U patent/CN211606072U/en active Active
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