CN107910232B - An intelligent leakage protection switch - Google Patents

Abstract

The invention discloses an intelligent leakage protection switch, which comprises a leakage protector with an electric operating mechanism, a protection controller and a bypass switch. The leakage protector is the basic structure of the present invention, used to realize leakage and overload protection; the protection controller is used to test the leakage protection function without power failure for the user; the bypass switch is used to realize the leakage protection function of the leakage protector test When used as a bypass to supply power to the user. The invention has the beneficial effects of not stopping the power supply when testing the leakage protection function of the leakage protector, and being able to periodically and automatically detect the leakage protection function.

Description

An intelligent leakage protection switch

technical field

The invention relates to a relay protection device in the technical field of power distribution and power supply, in particular to an intelligent leakage protection switch.

Background technique

In daily life or in factory power supply and distribution systems, the application of leakage protectors is very common. Leakage protector is a protective device that disconnects the leakage protection switch when electric leakage is detected or people get an electric shock, so that people are out of danger. There are generally two types of leakage protectors, one is a switch that integrates the leakage protection module and the overcurrent protection module, and the other is a separate leakage release that uses its linkage rod to drive the overcurrent protection switch to open. A leakage release with application number 201720127633.8 is a single leakage release. A leakage circuit breaker with application number 201310420543.4 is an integrated leakage protector.

In the application process of leakage protectors, it is a well-known common sense to conduct leakage function tests, and in the process of leakage protection function tests, the opening of circuit breakers or leakage protectors is an essential process, so it will cause users Side power outages cause inconvenience to electricity consumption. However, in factories, power outages due to the leakage detection function will affect production and reduce production efficiency. Failure to detect the leakage protector will cause hidden dangers in the safe use of electricity. Therefore, it is an urgent need to design an intelligent leakage protection switch that can detect whether the leakage protection function is normal or not and ensure that the user side is not powered off.

Contents of the invention

The technical problem to be solved by the present invention is to provide an intelligent leakage protection switch, which has the function of periodic automatic detection of leakage protection, and the function of maintaining normal power supply at the user side during the detection process.

The technical solution of the technical problem to be solved in the present invention is: an intelligent leakage protection switch, including a leakage protector with an electric operating mechanism, characterized in that it also includes a bypass device fixedly connected to the leakage protector, the bypass The bypass device includes a protection controller and a bypass switch connected together. The protection controller includes an integrally formed casing, and a control circuit is arranged inside the casing. There are two protruding connecting rods on the side adjacent to the earth leakage protector of the housing. The protruding connecting rods are hollow and communicate with the inside of the housing. Out of the connecting rod, the protruding connecting rod is located on the upper part of the leakage protector, and the upper and lower planes of the end of the protruding connecting rod close to the leakage protector are provided with transmission through holes, and the inside of the protruding connecting rod is provided with an electromagnetic button , the electromagnetic button inside the first protruding connecting rod is a test electromagnetic button, the electromagnetic button inside the second protruding connecting rod is a reset electromagnetic button, the transmission through hole of the first protruding connecting rod and the test button of the leakage protector The position of the second protruding connecting rod coincides with the position of the reset button of the earth leakage protector up and down. The front and rear of the housing are provided with main circuit terminals, and the upper side of the front of the housing is provided with control terminals, the main circuit terminals at the front are incoming line terminals, and the main circuit terminals at the rear include Outlet terminals, main circuit lead terminals, bypass lead terminals, the control terminals include bypass closing control terminals, bypass opening control terminals, main circuit closing control terminals, the main circuit terminals and control terminals are double contact terminals. The electromagnetic button includes a key shaft, an absorbing iron sheet, an electromagnetic coil, and a spring. The key shaft is inserted into the transmission through hole and the upper and lower ends of the key shaft are respectively flush with the upper and lower planes of the protruding connecting rod. The coil is set on the lower part of the button shaft and is fixedly connected to the inside of the protruding connecting rod. The adsorption iron sheet is located on the upper part of the electromagnetic coil and is fixedly connected to the button shaft. The spring is arranged between the adsorption iron sheet and the electromagnetic coil , and the two ends of the spring are respectively fixedly connected with the adsorption iron sheet and the electromagnetic coil. The bypass switch is a contactor. The control circuit includes a power module, a controller, a bypass closing relay, a bypass opening relay, and a main road closing relay, the coil windings of the bypass closing and opening relays, and the coil windings of the main road closing relay It is electrically connected with the controller, and the electromagnetic coil of the test electromagnetic button and the electromagnetic coil of the reset electromagnetic button are electrically connected with the controller. The upper part of the housing is provided with a manual bypass closing button and a manual bypass opening button, the manual bypass closing button is a normally open button, and the manual bypass opening button is a normally closed button. The upper surface of the manual bypass closing and opening buttons is flush with the surface of the housing of the protection controller. The upper surface of the housing is provided with a plurality of fault indicator lights, which are light-emitting diodes and are electrically connected to the controller. The input end of the power module is electrically connected to the zero and live wires of the incoming terminal, and the output end of the power module is electrically connected to the controller. The two ends of the normally open contact of the bypass closing relay are electrically connected to the two ends of the bypass closing control terminal, and the manual bypass closing button is connected in parallel with the normally open contact of the bypass closing relay, The manual bypass opening button and the normally closed contact of the bypass opening relay are connected in series and connected to the two ends of the bypass opening control terminal, and the two ends of the normally open contact of the main circuit closing relay and The two ends of the main circuit closing control terminal are electrically connected. The power supply end of the leakage protector is connected to the incoming line terminal in parallel, the load end of the leakage protector is connected to the main circuit lead terminal in parallel, and the main circuit lead terminal, the bypass lead terminal and the outgoing line terminal are connected in parallel inside the housing. The control power supply of the electric operating mechanism is connected to the zero live wire of the incoming line terminal, and the closing control terminal of the electric operating mechanism is electrically connected to the closing control terminal of the main circuit. The coil winding of the bypass switch is connected in series with the bypass closing control terminal and connected between the neutral and live wires of the incoming terminal, and the bypass opening control terminal and the normally open contact of the bypass switch are connected in series with the bypass switch. The circuit closing control terminals are connected in parallel, the incoming line end of the main contact of the bypass switch is electrically connected to the incoming line terminal, and the outgoing line end of the main contact of the bypass switch is electrically connected to the bypass lead terminal. The outgoing line terminal of the protection controller is electrically connected to the user load, and the incoming line terminal of the protection controller is electrically connected to the power supply grid.

More preferably, the bypass switch is a miniature circuit breaker provided with an electric operating mechanism.

Better, the upper part of the electromagnetic coil of the electromagnetic button is provided with a button switch to detect whether the adsorption iron sheet is in motion, the button switch in the test electromagnetic button is a test detection button switch, and the button switch inside the reset electromagnetic button is reset detection The push button switch, the test detection push button switch and the reset detection push button switch are electrically connected with the controller.

Preferably, a main circuit current transformer is sleeved on the live wire connecting line between the outgoing line terminal and the main circuit lead terminal, the outgoing line terminal of the main circuit current transformer is electrically connected to the controller, and the outgoing line terminal is connected to the side A bypass current transformer is set on the live wire connecting line between the lead wire terminals, and the outlet terminal of the bypass current transformer is electrically connected with the controller. The main and bypass current transformers are used to detect whether there is To determine whether the contacts of leakage protector and bypass switch are disconnected.

Preferably, a leakage signal relay is provided inside the leakage protector, the coil winding of the leakage signal relay is connected in parallel with the leakage tripping coil of the leakage protector, and the control terminal of the protection controller also includes a leakage detection terminal. The terminal is electrically connected to the controller, and the normally open contact of the leakage signal relay is electrically connected to the leakage detection terminal of the protection controller through a wire.

More preferably, the lower part of the transmission through hole is provided with a limit stopper, and the limit stopper is fixedly connected with the inner wall of the casing.

More preferably, the control circuit is provided with a communication module, and the communication module is electrically connected to the controller.

A method for using an intelligent leakage protection switch is characterized in that it includes the following methods:

Method 1, the method of manually testing the leakage protection function under the condition that the leakage protector is working normally:

Step 1.1, press the manual bypass closing button to turn on the bypass switch;

Step 1.2, press the button shaft of the test electromagnetic button, the button shaft of the test electromagnetic button slides down to drive the test button of the leakage protector, and the leakage protector detects that the test button is pressed and starts the tripping action;

Step 1.3, check whether the leakage protector has tripped, if not, it means that the leakage protector is faulty, and check and replace the leakage protector; if it trips, it means that the leakage protector is functioning normally and go to step 1.4;

Step 1.4, press the button shaft of the reset electromagnetic button, the button shaft of the reset electromagnetic button slides down to drive the reset button of the leakage protector, and the leakage protector resets after the leakage protector detects that the reset button is pressed;

Step 1.5, close the leakage protector;

Step 1.6, press the manual bypass opening button to disconnect the bypass switch and complete the test.

Method 2, the control method of periodic automatic test leakage function:

There is a time timer unit inside the controller, which starts the automatic test function after a period of one month,

Step 2.1, the controller controls the coil winding of the bypass closing relay to be electrified, the normally open contact of the bypass closing relay is closed, and the main contact of the bypass switch is connected;

Step 2.2, the controller controls to detect whether the main contact of the bypass switch is connected, if it is not connected, the controller lights up the fault indicator light; if it is connected, then perform step 2.3; the detection method is that the controller detects Check whether the circuit current transformer has current, if there is current, it means it has been connected, if there is no current, it means it is not connected;

Step 2.3, the controller connects the electromagnetic coil of the test electromagnetic button, and the adsorption iron sheet of the test electromagnetic button slides downward under the suction of the electromagnetic coil, thereby driving the key shaft of the test electromagnetic button to move downward and pressing the leakage protector. test button;

Step 2.4, the controller detects and tests whether the button switch is closed. If it is not closed, it means that the test electromagnetic button does not execute the instructions of the controller and the controller lights up the fault indicator light; if it is closed, perform step 2.5;

Step 2.5, the controller detects whether the switch contact of the leakage protector is disconnected, specifically, the controller detects whether there is current in the main circuit current transformer, if there is current, it means that the contact of the leakage protector is not disconnected, and the controller lights up Fault indicator light; if no current is detected, it means that the leakage protector has been disconnected, and step 2.6 is performed;

Step 2.6, the controller turns on the electromagnetic coil of the reset electromagnetic button, and the button shaft of the reset electromagnetic button is driven by the adsorption iron sheet to move downward, and then press the reset button of the leakage protector;

Step 2.7, the controller detects whether the reset detection button switch is closed. If it is not closed, it means that the reset electromagnetic button fails to execute the controller's instructions, and the controller lights up the fault indicator light; if it is closed, perform step 2.8;

Step 2.8, the controller controls the coil winding of the main circuit closing relay to be electrified, the normally open contact of the main circuit closing relay is closed, and the electric operating mechanism detects that the normally open contact of the main circuit closing relay is closed and controls the leakage protector to close brake;

Step 2.9, the controller detects whether the leakage protector is closed, specifically, the controller detects whether there is current in the main circuit current transformer, if there is current, it means that the leakage protector has closed, and executes step 2.10, if no current is detected, then Indicates that the leakage protector fails to close, and the controller lights up the fault indicator light;

Step 2.10, the controller controls the coil winding of the bypass opening relay to be electrified, the normally closed contact of the bypass opening relay is disconnected, and then the coil winding of the bypass switch 3 is de-energized, and the main contact of the bypass switch is disconnected;

Step 2.11, the controller detects whether the main contact of the bypass switch is disconnected, specifically, the controller detects whether there is current in the bypass current transformer, if there is current, it indicates that the bypass switch is faulty, and the controller lights up the fault indicator light, If there is no current, it means that the main contact of the bypass switch has been disconnected, this time the automatic detection leakage protection function is over, and it has returned to the normal state.

Preferably, in the method 1, in the process of performing steps 1.1 to 1.6, the controller also detects whether the normally open contact of the leakage signal relay is closed, and if it is detected that the normally open contact of the leakage signal relay is closed, the control If the relay sends an instruction to disconnect the bypass switch to disconnect the main contact of the bypass switch, if no leakage signal is detected, the normally open contact of the relay is closed, then normally execute steps 1.1 to 1.5;

In the method 1, after performing step 1.6, the controller detects whether there is current in the bypass current transformer, if there is current, it means that the main contact of the bypass switch is not disconnected, the bypass switch is faulty, and the controller lights up Fault indicator light, if there is no current, it means that the main contact of the bypass switch has been disconnected, and the equipment returns to normal state.

Preferably, in the method 2, in the process of executing steps 2.2 to 2.9, the controller also detects whether the normally open contact of the leakage relay is closed, and if the normally open contact of the leakage signal relay is closed, the controller sends a disconnection signal. The command of the bypass switch causes the main contact of the bypass switch to be disconnected, and if the normally open contact of the leakage signal relay is not detected to be closed, then step 2.2 to step 2.9 are normally performed.

The beneficial effects of the present invention are:

1. The intelligent leakage protection switch of the invention has the beneficial effect of non-stop power supply on the user side when detecting the leakage protection function;

2. The intelligent leakage protection switch of the invention has the beneficial effect of detecting leakage and automatically disconnecting the bypass switch after the leakage protector is opened during leakage detection;

3. In the leakage detection process of the intelligent leakage protector of the invention, the bypass switch has the function of overload protection;

4. The intelligent leakage protection switch of the invention has the beneficial effect of periodically automatically detecting the leakage protection function.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of an intelligent leakage protection switch of the present invention,

Fig. 2 is a front view of a protection controller of an embodiment of an intelligent leakage protection switch of the present invention,

Fig. 3 is a top view of a protection controller of an embodiment of an intelligent leakage protection switch of the present invention,

Fig. 4 is a sectional view in the direction of A in Fig. 2,

Fig. 5 is a sectional view along B direction in Fig. 2 ,

Fig. 6 is an electrical connection diagram of an embodiment of an intelligent leakage protection switch of the present invention,

Fig. 7 is an internal electrical wiring diagram of the protection controller of an embodiment of an intelligent leakage protection switch of the present invention,

Fig. 8 is a circuit diagram of a bypass leakage detection function of an embodiment of an intelligent leakage protection switch of the present invention.

In the picture:

11. Electric operating mechanism, 12. Leakage protector,

2. Protection controller, 3. Bypass switch,

21. Incoming wire terminal, 23. Outgoing wire terminal, 24. Main road lead wire terminal, 25. Bypass lead wire terminal, 26. Bypass closing control terminal, 27. Bypass opening control terminal, 28. Main road closing control terminal Terminal, 29, leakage detection terminal,

41, the first protruding connecting rod, 42, the second protruding connecting rod, 51, the test electromagnetic button, 52, the reset electromagnetic button,

61, button shaft, 62, adsorption iron sheet, 63, electromagnetic coil, 64, spring, 65, limit stopper,

71. Power module, 72. Controller,

K1, bypass closing relay, K2, bypass opening relay, K3, main circuit closing relay, K4, leakage signal relay,

S1, test detection button switch, S2, reset detection button switch, SH, manual bypass closing button, SF, manual bypass opening button, L1, main circuit current transformer, L2, bypass current transformer.

Detailed ways

In order to make the technical solutions and beneficial effects of the present invention clearer, the implementation manners of the present invention will be further explained in detail below.

As shown in Figure 1, an intelligent leakage protection switch includes an electric operating mechanism 11, a leakage protector 12, and a bypass device fixedly connected to the leakage protector 12. The bypass device includes a protection controller 2 and a protection controller connected together. Bypass switch 3. The electric operating mechanism 11 is a device for controlling the opening and closing of the circuit breaker. An electric operating mechanism for a circuit breaker with application number 201310220676.7 is an electric operating mechanism for controlling a miniature circuit breaker. An electric operating mechanism for a circuit breaker with application number 201410821977.X is an electric operating mechanism for a molded case circuit breaker. Leakage protector 12 is a kind of protector that detects leakage and connects to disconnect the circuit breaker. The leakage protector with application number 201420143191.2 is a kind of leakage protector of miniature circuit breaker type. The bypass switch 3 is a controllable switching device, and common devices include relays, contactors, switch tubes, and miniature circuit breakers. In the present invention, the bypass switch 3 is a contactor. A contactor refers to an electrical appliance that uses a coil to flow through a current to generate a magnetic field to close the contacts in industrial electricity to control the load. The contactor is mainly composed of a contact system, an electromagnetic operating system, a bracket, an auxiliary contact and a casing (or chassis). The contact system includes a main contact for controlling the load and an auxiliary contact for control and detection. The main contact is a high-power switching node, and the auxiliary contacts include small-capacity normally open contacts and normally closed contacts.

More preferably, in order to realize the overload protection function during bypass operation, the bypass switch 3 selects a miniature circuit breaker with an electric operating mechanism. The protection controller 2 is the core component of the present invention, and has the functions of controlling the closing and opening of the leakage protector 12, controlling the main contact of the bypass switch 3 to be turned on and off, controlling the test button and the reset button, and detecting overcurrent and leakage .

The protection controller 2 is an electrical device. In order to facilitate installation and improve safety, the protection controller 2 is provided with a casing, and a control circuit is arranged inside the casing. Since a test button and a reset button are provided on the upper part of the leakage protector 12, in order to realize automatic testing and reset of the device, a corresponding electrical mechanism is required to control the above two buttons. Therefore, two hollow protruding connecting rods, a first protruding connecting rod 41 and a second protruding connecting rod 42 , are provided on the side of the housing adjacent to the earth leakage protector 12 . Transmission through holes are arranged on the upper and lower planes of the end of the protruding connecting rod close to one end of the earth leakage protector 12, and an electromagnetic button is provided inside the protruding connecting rod. The transmission through hole of the first protruding connecting rod 41 overlaps with the test button of the earth leakage protector 12 up and down. The electromagnetic button inside the first protruding connecting rod 41 is a test electromagnetic button 51 . The transmission through hole of the second protruding connecting rod 42 overlaps with the reset button of the earth leakage protector 12 up and down, and the electromagnetic button inside the second protruding connecting rod 42 is the reset electromagnetic button 52 .

The test electromagnetic button 51 is used to realize electric control to press the test button on the leakage protector 12 , and the reset electromagnetic button 52 is used to realize electric control to press the reset button of the leakage protector 12 . As shown in FIG. 4 , in order to realize the above functions, the components of the electromagnetic button include a button shaft 61 , an adsorption iron piece 62 , an electromagnetic coil 63 , and a spring 64 . The electromagnetic coil 63 is fixedly connected with the inner lower part of the protruding connecting rod. The electromagnetic coil 63 is provided with lead wires and its main body is casted with insulating material. The ring center of the electromagnetic coil 63 coincides up and down with the transmission through hole. The button shaft 61 is plugged into the inner core of the electromagnetic coil 63, and the upper and lower ends are flush with the upper and lower planes of the protruding connecting rod. In order to realize the up and down movement of the key shaft 61, an adsorption iron sheet 62 is arranged on the top of the key shaft 61, and the adsorption iron sheet 62 is fixedly connected with the key shaft 61, so when the electromagnetic coil 63 is electrified, the adsorption iron sheet 62 is attracted. And drive the key shaft 61 to move downward. In order to ensure that the button shaft 61 is reset when the electromagnetic coil 63 is de-energized, a spring 64 is arranged between the adsorption iron piece 62 and the electromagnetic coil 63 . The upper and lower ends of the spring 64 are fixedly connected to the adsorption iron sheet 62 and the electromagnetic coil 63 respectively.

As shown in Figure 5, better, in order to buffer the impact on the protruding connecting rod when the adsorption iron sheet 62 is reset, a limit stopper 65 is set at the bottom of the transmission through hole, and the limit stopper 65 and the protruding connecting rod The upper fixed connection inside the rod. The electromagnetic attraction force generated by the electromagnetic coil 63 inside the electromagnetic button is greater than the elastic force of the spring 64 to ensure that the button shaft 61 can be pressed smoothly.

The protruding connecting rod of the casing is used to realize the installation of electromagnetic buttons to control the test button and reset button of the earth leakage protector 12. To realize electrical control, terminals are needed for electrical connection, so the front and rear of the casing The main circuit terminal is provided, and the control terminal is also provided at the upper end of the front part of the housing. As shown in Fig. 2 and Fig. 3, the main circuit terminal on the front side is the incoming line terminal 21, which is used to connect the external power supply. The main circuit terminals at the rear include outgoing line terminals 23 , main circuit lead terminals 24 , and bypass lead terminals 25 . The outlet terminal 23 is used to connect the electric load on the user side, and the main and bypass lead terminals 24 and 25 are respectively used to connect the leakage protector 12 and the output end of the bypass switch 3. Inside the protection controller 2, the outlet terminal 23 , Main and bypass lead terminals 24 and 25 are connected in parallel. The function of the main circuit terminal is to connect the user load and the large current path of the power supply. To realize the on-off control of the large current circuit, a control circuit is required, so the control terminals are set, including the bypass closing control terminal 26, bypass Road opening control terminal 27, main road closing control terminal 28. The bypass closing and opening control terminals 26 and 27 are used to control the on and off of the bypass switch 3 , and the main circuit closing control terminal 28 is used to control the closing of the leakage protector 12 . Since the mains power supply is mostly a live wire and a neutral wire, the control equipment interface requires two nodes, so the main circuit terminals and control terminals mentioned in this article are all double-contact terminals.

The above is the description of the structure of the protection controller 2. In order to realize the automatic leakage test and the continuous current leakage test, the core of the core component is the control circuit. The control circuit is arranged inside the casing, and the control circuit is usually fabricated on a PCB, and some larger or bulky electronic components are installed inside the casing. As shown in FIG. 7 , the control circuit includes a power module 71 , a controller 72 , a bypass closing relay K1 , a bypass opening relay K2 , and a main circuit closing relay K3 .

The power supply module 71 is used to supply power to the electrical components of the protection controller 2 , that is, a low-voltage DC power supply supported by AC 220V mains conversion electronic components. Therefore, the input end of the power module 71 is electrically connected to the end of the incoming line terminal 21 inside the casing. The output end of the power module 71 is electrically connected to the controller 72 . In order to realize the control of the relay and the electromagnetic button, the coil windings of the bypass closing and opening relays K1 and K2 and the coil winding of the main circuit closing relay K3 are electrically connected to the controller 72 . The electromagnetic coils of the test electromagnetic button 51 and the reset electromagnetic button 52 are electrically connected with the controller 72 .

In order to make the present invention more practical, in addition to being able to automatically control and test the leakage function, it is also necessary to be able to perform manual testing, so a manual bypass closing button SH and a manual bypass opening button SF are arranged on the upper plane of the housing. Since the contactor used in the embodiment of the present invention needs to control the electrical circuit to control the main contact of the contactor, the manual bypass closing button SH is a normally open button, and the manual bypass opening button SF is normally closed button. In order to prevent misoperation, the upper surface of the manual bypass closing and opening buttons SH and SF is flush with the upper surface of the housing. The above is the electronic components that make up the control circuit, and the circuit connection relationship of the control circuit will be described below.

1. The connection control circuit of the bypass switch 3 . The two ends of the normally open contact of the bypass closing relay K1 are electrically connected to the two nodes of the bypass closing control terminal 26 to realize the external output of the closing command from the controller 72; the manual bypass closing button SH is connected to the bypass closing control terminal 26. The normally open contacts of the closing relay K1 are connected in parallel to realize the external output closing command during the manual test. 2. The control circuit for disconnecting the bypass switch 3 . The manual bypass opening button SF and the normally closed contact of the bypass opening relay K2 are connected in series and connected to the two nodes of the bypass opening control terminal 27. The manual bypass opening button SF will output the disconnection control command to the bypass opening control terminal 27 . 3. The closing control circuit of leakage protector 12. The two ends of the normally open contact of the main circuit closing relay K3 are electrically connected to the two ends of the main circuit closing control terminal 28. When there is a manual test, the operator and the leakage protector 12 are directly operated, so the main circuit closing is not set. manual button.

The above is the description of the internal circuit of the protection controller 2, and the electric connection relationship between the electric operating mechanism 11, the leakage protector 12, the protection controller 2 and the bypass switch 3 of the present invention is described below.

As shown in Figure 6, according to the circuit diagram, it can be seen that: 1. The electrical connection of the main circuit is described. The power supply terminal of the leakage protector 12 is connected in parallel with the incoming line terminal 21 , and the load terminal of the leakage protector 12 is electrically connected with the main circuit lead terminal 24 . The incoming line end of the main contact of the bypass switch 3 is connected in parallel with the incoming line terminal 21 , and the outgoing line end of the main contact of the bypass switch 3 is electrically connected with the bypass lead terminal 25 . Second, the electrical connection of the control circuit. The control power supply of the electric operating mechanism 11 is electrically connected to the neutral live wire of the incoming line terminal 21 . The closing control input terminal of the electric operating mechanism 11 is electrically connected to the main circuit closing control terminal 28 . The coil winding of the bypass switch 3 is connected in series with the bypass closing control terminal 26 and connected between the neutral and live wires of the incoming terminal 21 . The bypass opening control terminal 27 is connected in parallel with the bypass closing terminal 26 after being connected in series with the normally open contact of the bypass switch 3 .

More preferably, in order to make the present invention have better safety and reliability, the protection controller 2 is provided with an action signal detection device, which is used to detect whether the actuator operates after the controller 72 sends out the control command.

First, a button switch is provided on the top of the electromagnetic coil 63 of the electromagnetic button, to detect whether the key shaft 61 is really pressed. The button switch on the electromagnetic coil top of the test electromagnetic button 51 is the test detection button switch S1; the button switch on the electromagnetic coil of the reset electromagnetic button 52 is the reset detection button switch S2. The test detection button switch S1 and the reset detection button switch S2 are electrically connected to the controller 72 respectively.

Secondly, main and bypass current transformers L1 and L2 are set on the live wire connecting line between the outlet terminal 23 and the main and bypass lead terminals 24 and 25 to detect the leakage protector 12 and the contact of the bypass switch 3. On and off conditions. The secondary lead wires of the main and bypass current transformers L1 and L2 are electrically connected to the controller 72 .

Finally, in order to indicate faults, a fault indicator light is provided on the upper surface of the housing. In order to indicate different faults, the number of fault indicator lights can be set to multiple. In order to make the present invention more small and exquisite, fault indicating lamp adopts light-emitting diode. The fault indicator light is electrically connected with the controller 72.

More preferably, in order to prompt the fault information of the automatic test to the maintenance and management personnel, the protection controller 2 is also equipped with a communication module. In current power system applications, it is common to use GPRS communication. Therefore a GPRS communication module can be set, the GPRS communication module is electrically connected with the controller 72, the controller 72 sends the detected fault information to the GPRS communication module, and the GPRS communication module sends information to the maintenance personnel through the data network.

Better, the function that the present invention realizes is when testing the leakage protection function of earth leakage protector 12, can guarantee that user side does not have power supply, has added bypass switch 3 and protection controller 2 for this reason, but works in bypass switch 3 The phenomenon of overload still occurs when the time is high. In order to increase the safety and reliability of the present invention, the controller 72 can detect the size of the current through the bypass current transformer L2 to detect whether there is an overcurrent. The fixed value is used to control the on-off of the bypass switch 3. Even better, a miniature circuit breaker with an electric operating mechanism can be used as the bypass switch 3 .

During the conduction process of the bypass switch 3 , besides the problem of overload, there will also be leakage. As shown in FIG. 8 , preferably, a leakage signal relay K4 is provided inside the leakage protector 12 . The coil winding of the leakage signal relay K4 is connected in parallel with the tripping coil of the leakage protector 12 , and the normally open contact of the leakage signal relay K4 is electrically connected to the controller 72 of the protection controller 2 through wires. Therefore, a threading hole is provided on the side of the leakage protector 12 to realize the passage of the wire; a leakage detection terminal 29 is provided at the control terminal of the protection controller 2 . The outside of the leakage detection terminal 29 is connected to the wire of the normally open contact of the leakage signal relay K4 , and the inside of the leakage detection terminal 29 is electrically connected to the controller 72 .

Based on the above structure, the present invention can realize the manual test and automatic test of the leakage protection function, and the usage method of the present invention will be described below.

Method 1, the method of manually testing the leakage protection function. Manual testing is performed on-site by maintenance personnel. The specific steps are:

Step 1.1, in order to prevent power failure on the user side, firstly connect the main contact of the bypass switch 3 by pressing the manual bypass closing button SH on the upper part of the protection controller 2 . According to the circuit structure, after pressing the manual bypass closing button SH, the coil winding of the bypass switch 3 is electrified, and the main contact circuit of the bypass switch 3 is connected.

Step 1.2, conduct leakage test. The test is the same as the leakage protector 12, and the test is carried out by pressing the test button. Since the protruding connecting rod of the protection controller 2 covers the test button of the leakage protector 12, it is necessary to press the key shaft 61 of the test electromagnetic button 51, and press the test button of the leakage protector 12 through the key shaft 61.

Step 1.3, check whether the leakage protector 12 is tripped. If it trips, it means that the leakage protection function is normal, and you can continue to step 1.4; if it does not trip, it means that the leakage protector 12 is faulty and needs to be repaired or replaced.

Step 1.4, reset the leakage protector 12 . Specifically, when the key shaft 61 of the reset electromagnetic button 52 is pressed, the key shaft 61 of the reset electromagnetic button 52 moves downwards and then the reset key of the leakage protector 12 is pressed.

Step 1.5, manually close the leakage protector 12 .

Step 1.6, restore the original state. Specifically, press the manual bypass opening button SF on the upper part of the protection controller 2. According to the circuit connection relationship, the coil winding of the bypass switch 3 loses power, and then the main contact of the bypass switch 3 is disconnected, returning to the initial state. state. Better, after the bypass switch 3 is turned off, the controller 72 detects whether there is current in the bypass current transformer L2, if there is current, it means that the main contact of the bypass switch 3 is not disconnected, and there may be a problem of contact sintering problem and the controller 72 lights up the fault indicator light; if there is no current, it means that the bypass switch 3 is normal.

Preferably, in order to perform leakage protection during the time when the bypass switch 3 is turned on, during the process of performing steps 1.1 to 1.5, the controller 72 also detects whether the normally open contact of the leakage signal relay K4 is closed, if detected The normally open contact of the leakage signal relay K4 is closed, and the controller 72 sends an instruction to disconnect the bypass switch 3 so that the main contact of the bypass switch 3 is disconnected. If the normally open contact of the leakage signal relay K4 is not detected to be closed Then execute steps 1.1 to 1.5 normally.

The above is the manual detection leakage protection function, because the leakage protector 12 needs to be detected once a month, which is a kind of workload for busy maintenance personnel, so the automatic detection function developed by the present invention. The automatic periodic detection control method is described below.

The inside of controller 72 is provided with a time timer unit, which automatically starts the leakage detection function after detecting a one-month time period, and the automatic leakage detection function includes the following steps:

Step 2.1, turn on the bypass switch 3, specifically, the controller 72 controls the coil winding of the bypass closing relay K1 to be electrified, the normally open contact of the bypass closing relay K1 is closed, and the main contact of the bypass switch 3 is connected to Pass.

In step 2.2, the controller 72 detects whether the main contact of the bypass switch 3 is connected, if it is connected, then execute step 2.3, if not, turn on the fault indicator light. The method of detecting whether the bypass switch 3 is connected is that the controller 72 detects whether the bypass current transformer L2 has current, if there is current, it means it has been connected, and if there is no current, it means it is not connected.

Step 2.3, test the leakage protection function, specifically, the controller 72 turns on the electromagnetic coil of the test electromagnetic button 51, and the adsorption iron sheet 62 is driven by the electromagnetic attraction force to move the key shaft 61 downward, and the key shaft 61 triggers the leakage protector 12 test buttons.

Step 2.4, check whether the test electromagnetic button 51 executes the instruction sent by the controller 72, specifically, the controller 72 checks whether the test button switch S1 is closed, if not closed, it means that the protection controller 2 is faulty, and then the controller 72 lights up the fault If the indicator light is closed, it means that the device is normal, and you can proceed to step 2.5.

Step 2.5, the controller 72 detects whether the leakage protector 12 is disconnected, specifically, the controller 72 detects whether there is current in the main circuit current transformer L1, if there is current, it means that the leakage protector 12 is not disconnected, and the controller 72 lights up If the fault indicator light detects that there is no current, it indicates that the leakage protector 12 has been disconnected, and step 2.6 is performed.

Step 2.6, reset the leakage protector 12, specifically, the controller 72 turns on the electromagnetic coil of the reset electromagnetic button 52, and the button shaft 61 of the reset electromagnetic button 52 moves downward under the action of the attractive iron sheet 62 , and then press the reset button of the leakage protector 12.

Step 2.7, the controller 72 detects whether the reset detection button switch S2 is closed, if it is not closed, the fault indicator light is lit, and if it is closed, step 2.8 is performed;

Step 2.8, closing the leakage protector 12, specifically, the controller 72 controls the coil winding of the main circuit closing relay K3 to be electrified, the normally open contact of the main circuit closing relay K3 is closed, and the electric operating mechanism 11 detects that the main circuit After the normally open contact of the closing relay K3 is closed, the leakage protector 12 is controlled to close.

Step 2.9, detect whether the leakage protector 12 is switched on, specifically, the controller 72 detects whether there is current in the main circuit current transformer L1, if there is current, it means that the leakage protector 12 has been switched on, and step 2.10 is performed, if it is detected that there is no current The current shows that the leakage protector 12 fails to close, and the controller 72 lights the fault indicator light;

Step 2.10, disconnect the bypass switch 3, specifically, the controller 72 controls the electrification of the coil winding of the bypass opening relay K2, and the normally closed contact of the bypass opening relay K2 is disconnected, as can be known from the connection structure of the circuit, at this time The coil winding of the bypass switch 3 is de-energized, and the main contact of the bypass switch 3 is disconnected.

Step 2.11, detect whether the main contact of the bypass switch 3 is disconnected, specifically, the controller 72 detects whether there is current in the bypass current transformer L2, if there is current, it means that the bypass switch 3 is faulty, and there may be a problem of contact sintering , and the controller 72 lights the fault indicator light; if there is no current, it means that the main contact of the bypass switch 3 has been disconnected, and the automatic detection leakage protection function ends this time, and has returned to the normal state.

Better, in order to be able to continue to play the function of leakage protection when detecting the leakage protection function, in each step in the process of performing steps 2.2 to 2.9, the controller 72 detects whether the leakage signal relay K4 is closed, and if it is closed, the controller 72 sends an instruction to disconnect the bypass switch 3 so that the main contact of the bypass switch 3 is disconnected; if there is no detection closure, the steps 2.2 to 2.9 are normally performed.

In summary, it is only a preferred embodiment of the present invention, and it is not used to limit the scope of the present invention. Through the above description, relevant workers can perform various tasks without departing from the scope of the technical idea of the present invention. changes and modifications. The technical scope of the present invention is not limited to the contents of the description, and all the so-called equivalent changes and modifications of the shape, structure, characteristics and spirit described in the scope of the claims of the present invention shall be included in the scope of the claims of the present invention.

Claims (10)

1. An intelligent leakage protection switch, comprising a leakage protector (12) with an electric operating mechanism (11), is characterized in that: It also includes a bypass device fixedly connected to the leakage protector (12), and the bypass device includes a protection controller (2) and a bypass switch (3) connected together, The protection controller (2) includes an integrally formed casing, and a control circuit is arranged inside the casing, There are two protruding connecting rods on the side adjacent to the leakage protector (12) of the housing. The protruding connecting rods are hollow and communicate with the inside of the housing. The two protruding connecting rods are respectively the first , two protruding connecting rods (41, 42), said protruding connecting rods are positioned at the top of the earth leakage protector (12), and the upper and lower planes of one end of the protruding connecting rods near the earth leakage protector (12) are provided with transmission Through holes, the inside of the protruding connecting rod is provided with an electromagnetic button, the electromagnetic button inside the first protruding connecting rod (41) is a test electromagnetic button (51), and the electromagnetic button inside the second protruding connecting rod (42) is Reset the electromagnetic button (52), the transmission through hole of the first protruding connecting rod (41) coincides with the position of the test button of the leakage protector (12) up and down, and the transmission of the second protruding connecting rod (42) The position of the reset button of the through hole and the earth leakage protector (12) coincides up and down, The front and rear of the housing are provided with main circuit terminals, and the upper side of the front of the housing is provided with control terminals, the main circuit terminals at the front are incoming line terminals (21), and the main circuit terminals at the rear are The loop terminals include outlet terminals (23), main circuit lead terminals (24), and bypass lead terminals (25), and the control terminals include bypass closing control terminals (26), bypass opening control terminals (27), The main circuit closing control terminal (28), the main circuit terminal and the control terminal are double-contact terminals, The electromagnetic button includes a key shaft (61), an adsorption iron sheet (62), an electromagnetic coil, and a spring (64). The key shaft (61) is inserted into the transmission through hole and the upper and lower ends of the key shaft (61) They are respectively flush with the upper and lower planes of the protruding connecting rod, the electromagnetic coil is sleeved on the lower part of the button shaft (61), and is fixedly connected with the inside of the protruding connecting rod, and the adsorption iron sheet (62) is located at the bottom of the electromagnetic coil The upper part is fixedly connected with the button shaft (61), the spring (64) is arranged between the adsorption iron sheet (62) and the electromagnetic coil, and the two ends of the spring (64) are connected with the adsorption iron sheet (62) and the electromagnetic coil respectively. fixed connection, The bypass switch (3) is a contactor, The control circuit includes a power module (71), a controller (72), a bypass closing relay (K1), a bypass opening relay (K2), and a main circuit closing relay (K3). The coil winding of the opening relay (K1, K2), the coil winding of the main circuit closing relay (K3) and the controller (72) are electrically connected, and the electromagnetic coil of the test electromagnetic button (51), the reset electromagnetic button (52) The electromagnetic coil and the controller (72) are electrically connected, The upper part of the housing is provided with a manual bypass closing button (SH) and a manual bypass opening button (SF), the manual bypass closing button (SH) is a normally open button, and the manual bypass opening button The brake button (SF) is a normally closed button, and the upper surface of the manual bypass closing and opening buttons (SH, SF) is flush with the surface of the housing of the protection controller (2), The upper surface of the housing is provided with a plurality of fault indicator lights, which are light-emitting diodes and are electrically connected to the controller (72), The input end of the power module (71) is electrically connected to the zero and live wires of the incoming terminal (21), and the output end of the power module (71) is electrically connected to the controller (72). The two ends of the normally open contact of the bypass closing relay (K1) are electrically connected to the two ends of the bypass closing control terminal (26), and the manual bypass closing button (SH) is connected to the bypass closing The normally open contacts of the relay (K1) are connected in parallel, and the normally closed contacts of the manual bypass opening button (SF) and the bypass opening relay (K2) are connected in series and connected to the bypass opening control terminal (27 ), the two ends of the normally open contact of the main circuit closing relay (K3) are electrically connected to the two ends of the main circuit closing control terminal (28), The power supply end of the leakage protector (12) is connected in parallel with the incoming line terminal (21), the load end of the leakage protector (12) is connected in parallel with the main circuit lead terminal (24), and the main circuit lead terminal ( 24), the bypass lead terminal (25) and the outlet terminal (23) are connected in parallel, The control power supply of the electric operating mechanism (11) is connected to the zero live wire of the incoming line terminal (21), and the closing control terminal of the electric operating mechanism (11) is electrically connected to the main circuit closing control terminal (28), The coil winding of the bypass switch (3) is connected in series with the bypass closing control terminal (26) and connected between the neutral and live wires of the incoming terminal (21), and the bypass opening control terminal (27) and The normally open contact of the bypass switch (3) is connected in parallel with the bypass closing control terminal (26) after being connected in series, and the incoming line end and incoming line terminal (21) of the main contact of the bypass switch (3) are electrically connection, the outlet end of the main contact of the bypass switch (3) is electrically connected to the bypass lead terminal (25), The outgoing line terminal (23) of the protection controller (2) is electrically connected to the user load, and the incoming line terminal (21) of the protection controller (2) is electrically connected to the power supply network. 2. A kind of intelligent leakage protection switch according to claim 1, characterized in that: The bypass switch (3) is a miniature circuit breaker provided with an electric operating mechanism. 3. A kind of intelligent leakage protection switch according to claim 1, characterized in that: The top of the electromagnetic coil of the electromagnetic button is provided with a button switch to detect whether the adsorption iron sheet (62) moves, and the button switch in the test electromagnetic button (51) is a test detection button switch (S1), and the reset electromagnetic button (52 The button switch inside ) is a reset detection button switch (S2), and the test detection button switch (S1) and the reset detection button switch (S2) are electrically connected to the controller (72). 4. An intelligent leakage protection switch according to claim 3, characterized in that: A main circuit current transformer (L1) is sleeved on the fire wire connecting line between the outlet terminal (23) and the main circuit lead terminal (24), and the outlet terminal of the main circuit current transformer (L1) and the controller (72) Electrical connection, a bypass current transformer (L2) is sleeved on the fire wire connecting line between the outlet terminal (23) and the bypass lead terminal (15), and the bypass current transformer (L2) The outlet terminal is electrically connected with the controller (72), The main and bypass current transformers (L1, L2) are used to determine whether the contacts of the leakage protector (12) and the bypass switch (3) are disconnected by detecting whether there is current. 5. A kind of intelligent leakage protection switch according to claim 4, is characterized in that: The leakage protector (12) is internally provided with a leakage signal relay (K4), the coil winding of the leakage protector (K4) is connected in parallel with the leakage tripping coil of the leakage protector (12), and the protection controller (2 ) control terminal also includes a leakage detection terminal (29), the leakage detection terminal (29) is electrically connected to the controller (72), and the normally open contact of the leakage signal relay (K4) is connected to the protection controller (2) through a wire The leakage detection terminal (29) is electrically connected. 6. An intelligent leakage protection switch according to claim 1, characterized in that: The lower part of the transmission through hole is provided with a limit block (65), and the limit block (65) is fixedly connected with the inner wall of the housing. 7. An intelligent leakage protection switch according to claim 1, characterized in that: The control circuit is provided with a communication module, and the communication module is electrically connected with the controller (72). 8. A method of using an intelligent leakage protection switch according to claim 5, characterized in that: Include the following methods: Method 1, the method of manually testing the leakage protection function under the condition that the leakage protector (12) works normally: Step 1.1, press the manual bypass closing button (SH), and turn on the bypass switch (3); Step 1.2, press the button shaft (61) of the test electromagnetic button (51), the button shaft (61) of the test electromagnetic button (51) slides down and then drives the test button of the leakage protector (12), the leakage protector (12) ) detects that the test button is pressed and starts the tripping action; Step 1.3, check whether the leakage protector (12) is tripped, if not, it means that the leakage protector (12) is faulty, and check and replace the leakage protector (12); if it trips, it means that the leakage protector (12) is functioning normally And execute step 1.4; Step 1.4, press the button shaft (61) of the reset electromagnetic button (52), the button shaft (61) of the reset electromagnetic button (52) slides down and then drives the reset button of the leakage protector (12), and the leakage protector (12) ) detects that the leakage protector (12) resets after the reset button is pressed; Step 1.5, close the leakage protector (12); Step 1.6, press the manual bypass opening button (SF), disconnect the bypass switch (3), and complete the test; Method 2, the control method of periodic automatic test leakage function: The inside of the controller (72) is provided with a time timer unit, which starts the automatic test function after a period of one month, Step 2.1, the controller (72) controls the coil winding of the bypass closing relay (K1) to be electrified, the normally open contact of the bypass closing relay (K1) is closed, and the main contact of the bypass switch (3) is connected; Step 2.2, the controller (72) controls to detect whether the main contact of the bypass switch (3) is connected, if not connected, the controller (72) lights the fault indicator light; if connected, then perform step 2.3; The detection method is that the controller (72) detects whether there is current in the bypass current transformer (L2), if there is current, it means that it has been connected, and if there is no current, it means that it is not connected; Step 2.3, the controller (72) connects the electromagnetic coil of the test electromagnetic button (51), and the adsorption iron sheet (62) of the test electromagnetic button (51) slides downward under the suction of the electromagnetic coil and then drives the test electromagnetic button ( 51) the key shaft (61) moves down and presses the test button of the leakage protector (12); Step 2.4, the controller (72) detects whether the test button switch (S1) is closed, if it is not closed, it shows that the test electromagnetic button (51) does not execute the instruction of the controller (72) and the controller (72) lights the fault indicator light ; If closed, execute step 2.5; Step 2.5, the controller (72) detects whether the switch contact of the leakage protector (12) is disconnected, specifically, the controller (72) detects whether there is current in the main circuit current transformer (L1), if there is current, it means that the leakage protection The contact of the device (12) is not disconnected, and the controller (72) lights the fault indicator light; if no current is detected, it shows that the leakage protector (12) has been disconnected, and step 2.6 is performed; Step 2.6, the controller (72) turns on the electromagnetic coil of the reset electromagnetic button (52), and the key shaft (61) of the reset electromagnetic button (52) is driven by the adsorption iron sheet (62) to move downward, and then press the leakage protection The reset button of device (12); Step 2.7, the controller (72) detects whether the reset detection button switch (S2) is closed, if it is not closed, it means that the reset electromagnetic button (52) fails to execute the instruction of the controller (72), and the controller (72) lights up the fault indication light; if closed, proceed to step 2.8; Step 2.8, the controller (72) controls the coil winding of the main circuit closing relay (K3) to be electrified, the normally open contact of the main circuit closing relay (K3) is closed, and the electric operating mechanism (11) detects that the main circuit closing relay (K3) After the normally open contact of (K3) is closed, the leakage protector (12) is controlled to close; Step 2.9, the controller (72) detects whether the leakage protector (12) is closed, specifically, the controller (72) detects whether there is current in the main circuit current transformer (L1), and if there is current, it means that the leakage protector (12) Closed, and step 2.10 is performed, if no current is detected, then the leakage protector (12) fails to close, and the controller (72) lights the fault indicator light; Step 2.10, the controller (72) controls the coil winding of the bypass opening relay (K2) to be electrified, and the normally closed contact of the bypass opening relay (K2) is disconnected, thereby de-energizing the coil winding of the bypass switch (3) , so that the main contact of the bypass switch (3) is disconnected; Step 2.11, the controller (72) detects whether the main contact of the bypass switch (3) is disconnected, specifically, the controller (72) detects whether there is current in the bypass current transformer (L2), if there is current, it means that the bypass The switch (3) is faulty, and the controller (72) lights up the fault indicator light. If there is no current, it means that the main contact of the bypass switch (3) has been disconnected. This time, the automatic detection leakage protection function is over and has been restored to normal status. 9. A method of using an intelligent leakage protection switch according to claim 8, characterized in that: In the method 1, in the process of performing step 1.1 to step 1.6, the controller (72) also detects whether the normally open contact of the leakage signal relay (K4) is closed, if the normally open contact of the leakage signal relay (K4) is detected The contact is closed, and the controller (72) sends an instruction to disconnect the bypass switch (3) to disconnect the main contact of the bypass switch (3). If the normally open contact of the leakage signal relay (K4) is not detected If it is closed, step 1.1 to step 1.5 will be executed normally; In the method 1, after performing step 1.6, the controller (72) detects whether there is current in the bypass current transformer (L2), and if there is current, it means that the main contact of the bypass switch (3) is not disconnected, and the bypass switch (3) is not disconnected. If there is a fault in the bypass switch (3), the controller (72) lights the fault indicator light, if there is no current, it shows that the main contact of the bypass switch (3) has been disconnected, and the equipment returns to a normal state. 10. A method of using an intelligent leakage protection switch according to claim 8, characterized in that: In the method 2, in the process of performing steps 2.2 to 2.9, the controller (72) also detects whether the normally open contact of the leakage relay (K4) is closed, if the normally open contact of the leakage signal relay (K4) is closed Then the controller (72) sends an instruction to disconnect the bypass switch (3) so that the main contact of the bypass switch (3) is disconnected, and if the normally open contact of the leakage signal relay (K4) is not closed, it is normally executed Step 2.2 to Step 2.9.