CN218386782U - Power line leakage detection protection device - Google Patents
Power line leakage detection protection device Download PDFInfo
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- CN218386782U CN218386782U CN202222400686.6U CN202222400686U CN218386782U CN 218386782 U CN218386782 U CN 218386782U CN 202222400686 U CN202222400686 U CN 202222400686U CN 218386782 U CN218386782 U CN 218386782U
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Abstract
The application discloses a power line leakage detection protection device, which relates to the field of leakage protection and comprises a tripping module, a leakage detection module and a driving module; the tripping module is used for disconnecting the load power supply; the electric leakage detection module is used for detecting whether the power line leaks electricity or not and sending an electric leakage signal when the electric leakage is detected; the leakage detection module comprises a first leakage detection line and a second leakage detection line, the first leakage detection line covers a first current-carrying wire in the power line, and the second leakage detection line covers a second current-carrying wire in the power line; the first end of the first leakage detection line is electrically connected with the driving module; the first end of the second electric leakage detection line is electrically connected with the driving module, and the second end of the second electric leakage detection line is electrically connected with the second end of the first electric leakage detection line; compared with the prior art, through the detection loop that forms two electric leakage detection lines and drive module, need not to dispose the connecting wire in addition for electric leakage detection line, both can realize earth leakage protection's function and open a way self-checking function, reduced the production degree of difficulty.
Description
Technical Field
The application relates to the field of electric leakage protection, in particular to a power line electric leakage detection protection device.
Background
The power line leakage detection protection device is used for detecting whether the power line leaks electricity or not and cutting off the power supply when the power line leaks electricity, so that the risk of electric shock or fire of people and animals caused by electric leakage of electric equipment or line short circuit of the power line due to aging, animal biting, extrusion and other reasons is effectively reduced.
For example, chinese utility model CN216794606U proposes a power line leakage detection protection device, an electrical connection device and an electrical appliance. The device comprises: the switch module controls the power connection between the input end and the output end of the power line; the leakage detection module comprises a first leakage detection line covering the first current-carrying line, a second leakage detection line covering the second current-carrying line, a first detection module and a second detection module, wherein the first leakage detection line is used for detecting a first leakage current signal on the first current-carrying line or generating a first self-detection fault signal when the first leakage detection line is opened; the driving module is coupled with the switch module and the electric leakage detection module, receives the first electric leakage current signal or the first self-detection fault signal and drives the switch module to disconnect the electric power connection; and receiving a second leakage current signal or a second self-checking fault signal and driving the switch module to disconnect the power connection.
The technical scheme of the utility model is that two test switches are arranged to respectively test whether the leakage detection line and the connecting line of the second current-carrying line and the first current-carrying line are intact, and a user can completely test whether the leakage detection line and the connecting line of the second current-carrying line and the first current-carrying line are intact only by pressing the two test switches, so that the use is inconvenient; the user probably thinks that the self-checking can be finished by pressing one of the two test switches, and the possibility of missing checking exists; in addition, each leakage detection line is also provided with a connecting line to form a detection loop, so that the difficulty and the cost of production and processing are improved.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the defects existing in the prior art, the cost of the power line leakage detection protection device is reduced, and meanwhile, the use convenience is improved.
2. Technical scheme
In order to solve the above problems, a power line leakage detection protection device is provided, which includes a tripping module, a leakage detection module and a driving module;
the tripping module is used for disconnecting the load power supply;
the electric leakage detection module is used for detecting whether electric leakage occurs in the power line and sending an electric leakage signal when the electric leakage is detected;
the leakage detection module comprises a first leakage detection line and a second leakage detection line, the first leakage detection line covers a first current-carrying wire in the power line, and the second leakage detection line covers a second current-carrying wire in the power line;
the first end of the first leakage detection line is electrically connected with the driving module;
the first end of the second electric leakage detection line is electrically connected with the driving module, and the second end of the second electric leakage detection line is electrically connected with the second end of the first electric leakage detection line;
the driving module is used for receiving a leakage signal sent by the leakage detection module, and the driving module is also used for driving the tripping module to disconnect the load power supply after receiving the leakage signal.
The leakage detection module is also used for sending out a fault signal when the first leakage detection line and/or the second leakage detection line are/is opened;
the driving module is also used for receiving a fault signal sent by the electric leakage detection module, and the driving module is also used for driving the tripping module to disconnect the load power supply after receiving the fault signal.
The power line leakage detection protection device also comprises a test module, wherein the test module is electrically connected with the leakage detection module; the test module comprises a test key;
the drive module is further configured to: when the test key is pressed down and the electric leakage detection module works normally, the driving tripping module disconnects the load power supply.
The test module is used for simulating power line leakage.
Wherein, the test key is a normally closed key;
the test keys are connected in series: any one position between the first electric leakage detection line and the driving module, between the first electric leakage detection line and the second electric leakage detection line, and between the second electric leakage detection line and the driving module.
The power line leakage detection protection device further comprises a rectification module, and the rectification module is used for rectifying alternating current into direct current.
The tripping module comprises a tripping coil and a switch, and the switch cuts off a power supply when the tripping coil is electrified.
3. Advantageous effects of the present application
Compared with the prior art, this application need not to dispose the connecting wire in addition for the electric leakage detection line through the detection return circuit with two electric leakage detection lines and drive module formation, both can realize earth leakage protection's function and open a way self-checking function, has reduced the production degree of difficulty and cost.
Whether all leakage detection lines are open-circuited or not and whether the leakage protection function is normal or not can be detected by pressing a test button by a user, and the use convenience is improved.
Drawings
FIG. 1 is a block schematic diagram of example 1 of the present application;
fig. 2 is a schematic diagram of embodiment 1 of the present application;
fig. 3 is a schematic diagram of embodiment 2 of the present application.
Detailed Description
The following detailed description of embodiments of the present application will be described in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
Example 1:
as shown in fig. 1, the power line leakage detection protection device includes a trip module 10, a leakage detection module 20, a driving module 30, a testing module 40, and a rectifying module 50.
As shown in fig. 2, the rectifier module 50 includes a rectifier bridge D2, a voltage dependent resistor ZNR1, and a voltage dependent resistor ZNR2, and the rectifier module 50 is used for rectifying ac power into dc power and for transient voltage protection;
the leakage detection module 20 includes a first leakage detection line 21 and a second leakage detection line 22, the first leakage detection line 21 covers the live line L in the power line, and the second leakage detection line 22 covers the zero line N in the power line, and it should be noted that the leakage detection line is covered with an insulation shielding layer (not shown in the figure), and a person skilled in the art may also use a leakage detection line with one side being an insulation layer and the other side being a conductor, and this embodiment is not limited herein;
a first end A of the first leakage detection line 21 is electrically connected with a control electrode of the silicon controlled rectifier SCR 1; a first end B of the second leakage detection line 22 is electrically connected with the cathode of the silicon controlled rectifier SCR 1; when the zero line N or the live line L leaks electricity, the leakage current passes through the resistor R2, the resistor R6, the resistor R7 and the resistor R4 to enable the silicon controlled rectifier SCR2 to be conducted, so that the trip coil L1 is electrified, and the disconnecting switch S1 disconnects the load power supply;
that is, when the leakage detecting module 20 detects leakage, the leakage detecting module 20 sends out a leakage signal, and the driving module 30 drives the trip module 10 to disconnect the load power supply after receiving the leakage signal sent by the leakage detecting module 20.
When the first leakage detection line 21 and the second leakage detection line 22 are intact, the silicon controlled rectifier SCR1 is cut off, and at the moment, the power line leakage detection protection device is always in an open-circuit self-detection state; when the first leakage detection line 21 or/and the second leakage detection line 22 are/is opened due to mouse bite and the like, the SCR1 is conducted, so that the trip coil L1 is electrified, and the switch S1 cuts off a load power supply;
namely, the first leakage detection line 21 and/or the second leakage detection line 22 send out a fault signal when being opened, and the driving module 30 drives the trip module 10 to disconnect the load power supply after receiving the fault signal;
the power line leakage detection protection device of this embodiment need not to dispose the connecting wire in addition for the leakage detection line through the detection return circuit that forms two leakage detection lines and drive module, both can realize leakage protection's function and open a way self-checking function, has reduced the production degree of difficulty and cost.
The test module 40 comprises a test key T1 and a resistor R8, one end of the test key T1 is electrically connected with the live wire L through the resistor R8, and the other end of the test key T1 is electrically connected with the first end A of the first leakage detection line 21 and the control electrode of the silicon controlled SCR1 respectively;
when a user presses a test key T1, under the condition that the power line leakage detection protection device is normal, the voltage of a cathode F point of the silicon controlled rectifier SCR1 is increased, so that the silicon controlled rectifier SCR2 is conducted, and the power line leakage detection protection device is disconnected from a power supply; when a user presses the test key T1, if the power supply line leakage detection protection device does not cut off the power supply, the power supply line leakage detection protection device is indicated to have a fault.
A user presses a test button T1 to detect whether all leakage detection lines are open-circuited or not and whether the leakage protection function is normal or not, and the use convenience is improved.
By adjusting the resistance value of the resistor R1, the current flowing through the point E, the point F, the resistor R2, the resistor R6 and the resistor R7 is smaller than the conduction current of the silicon controlled rectifier SCR2 under the rated voltage, wherein the resistor R7 and the resistor R4 are used for adjusting the conduction current of the silicon controlled rectifier SCR 2;
when the voltage of the live line L and the zero line N abnormally rises to the preset protection voltage, the high voltage passes through the resistor R1, the point E, the point F and the resistor R2 to enable the silicon controlled rectifier SCR2 to be conducted, and then the tripping module 10 is enabled to disconnect the load power supply, so that the overvoltage protection function is realized.
The preset protection voltage can be set by a person skilled in the art according to actual conditions, and in the present embodiment, the preset protection voltage is 150% of the rated voltage.
Example 2:
as shown in fig. 3, the present embodiment is different from embodiment 1 in that:
the test module 40 is a normally closed test key T1, and the test key T1 is connected in series between the first end a of the first leakage detection line 21 and the control electrode of the silicon controlled rectifier SCR 1; when a user presses the test key T1 or the leakage detection line is opened, the silicon controlled rectifier SCR1 is conducted, the silicon controlled rectifier SCR2 is conducted, the tripping module 10 is further made to be powered off, and the open-circuit self-detection function is achieved.
The test key T1 may also be connected in series between the second end C of the first leakage detecting line 21 and the second end D of the second leakage detecting line 22; or the second end D of the two leakage detection lines 22 is connected in series with the cathode of the silicon controlled rectifier SCR1, so that the same effect can be achieved, and a person skilled in the art can select the position where the test key T1 is connected in series according to actual conditions.
The above embodiments are merely illustrative, and not restrictive, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore all equivalent technical solutions also fall within the scope of the present application, and the scope of the present application is defined by the appended claims.
Claims (7)
1. The power line leakage detection protection device is characterized by comprising a tripping module (10), a leakage detection module (20) and a driving module (30);
the tripping module (10) is used for disconnecting a load power supply;
the electric leakage detection module (20) is used for detecting whether the power line leaks electricity or not and sending an electric leakage signal when the electric leakage is detected;
the electric leakage detection module (20) comprises a first electric leakage detection line (21) and a second electric leakage detection line (22), the first electric leakage detection line (21) covers a first current-carrying line in the power line, and the second electric leakage detection line (22) covers a second current-carrying line in the power line;
a first end (A) of the first leakage detection line (21) is electrically connected with the driving module (30);
a first end (B) of the second leakage detection line (22) is electrically connected with the driving module (30), and a second end (D) of the second leakage detection line (22) is electrically connected with a second end (C) of the first leakage detection line (21);
the driving module (30) is used for receiving a leakage signal sent by the leakage detection module (20), and the driving module (30) is also used for driving the tripping module (10) to disconnect a load power supply after receiving the leakage signal.
2. A power line leakage detection protection device according to claim 1, wherein said leakage detection module (20) is further adapted to issue a fault signal when said first leakage detection line (21) and/or said second leakage detection line (22) is open-circuited;
the driving module (30) is further configured to receive a fault signal sent by the leakage detection module (20), and the driving module (30) is further configured to drive the trip module (10) to disconnect the load power supply after receiving the fault signal.
3. The power line leakage detection protection device according to claim 2, further comprising a testing module (40), wherein the testing module (40) is electrically connected to the leakage detection module (20); the test module (40) comprises a test key (T1);
the drive module is further configured to: and when the test key (T1) is pressed down and the electric leakage detection module (20) works normally, the tripping module (10) is driven to disconnect a load power supply.
4. A power line leakage detection protection device according to claim 3, wherein said test module (40) is adapted to simulate power line leakage.
5. A power line leakage detection protection device according to claim 3, wherein said test button (T1) is a normally closed button;
the test key (T1) is connected in series: any one position between the first leakage detection line (21) and the driving module (30), between the first leakage detection line (21) and the second leakage detection line (22), or between the second leakage detection line (22) and the driving module (30).
6. A power line leakage detection protection device according to claim 1, further comprising a rectifying module (50), wherein the rectifying module (50) is configured to rectify an ac current into a dc current.
7. A power line leakage detection protection device according to claim 3, wherein said trip module (10) comprises a trip coil (L1) and a switch (S1), said switch (S1) disconnecting power when said trip coil (L1) is energized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222400686.6U CN218386782U (en) | 2022-09-09 | 2022-09-09 | Power line leakage detection protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222400686.6U CN218386782U (en) | 2022-09-09 | 2022-09-09 | Power line leakage detection protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218386782U true CN218386782U (en) | 2023-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222400686.6U Active CN218386782U (en) | 2022-09-09 | 2022-09-09 | Power line leakage detection protection device |
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| Country | Link |
|---|---|
| CN (1) | CN218386782U (en) |
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- 2022-09-09 CN CN202222400686.6U patent/CN218386782U/en active Active
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