TWM545355U - Switch contact status display apparatus - Google Patents

Abstract

The switch contact state display device is mainly used for displaying the contact state of an electrical switch to the outside of the switch after being read by the microprocessor through an electronic circuit. It can solve the inconvenience problem of maintenance for electrical equipment, in order to know the actual situation of the switch, the switch must be attached to additional components and used meter to read the required signals. The main technical characteristic is the electronic circuit is arranged inside the device, and is electrically connected with the primary side and the secondary side of the switch. The sensed signals are sent to the microprocessor and calculated according to the set operating state logic. The user can easily know the true state of the switch contacts from the light indicator. It enhances the safety, practicality, and can be quantified production standards. Therefore, the economic benefits can be achieved.

Description

Switch contact state detecting device

The present invention relates to a switch contact state detecting device and method, in particular to a power switch that is universally used for any specification, for checking and displaying the state of the contact of the switch, thereby improving electrical safety.

In the general distribution box, the two types of line equipment protection devices are the most common. There are two types, one is a circuit breaker and the other is an electromagnetic switch. The former circuit breaker has overload protection, fault current protection, and leakage fault protection, and is used for protection of the power equipment switch of the system distribution box. The electromagnetic switch is overload protection or under-phase protection, which is used to protect the operating equipment from overload or phase loss. Originally, when the status display of the circuit breaker and the electromagnetic switch is solved, the related state display device is installed, usually inside the circuit breaker body, such as adding a micro switch as an auxiliary contact or an alarm contact, generally a mechanical Actuation by structural conduction is a skill well known in the art.

The use of circuit breakers (CB) is a very common product, and circuit breakers can generally be divided into form-cavity circuit breakers (MCCB), or no-fuse circuit breakers (NFB). The former is a component title for products in Europe and the United States, and the latter is a product of the Japanese state. Another product classification name is Leakage Circuit Breaker (ELCB), which is a relatively small capacity circuit breaker commonly referred to as MCB and ELB. Usually MCCB and ELCB circuit breakers are used for large interrupting capacity, commonly known as industrial circuit breakers. While MCB and ELB are used for small interrupting capacity, they are commonly known as household light plug-in circuit breakers. Their functions are mainly protection. A disconnector for line and line safety, which is tripped and isolated when an overload occurs, and the fault current is safely tripped and isolated. If it is an earth leakage circuit breaker, it is added with the protection function of leakage fault tripping. The circuit breaker is used in various places and is the main isolation switch in the world as a protection device and line safety. It is also the most versatile product in the world.

The use of circuit breakers is so common that at present manufacturers of switchboards, due to space constraints, or because of economic costs, most of the circuit breakers and circuit breakers are adjacent to each other throughout the switchboard and distribution boxes. The configuration is then fixed on the plate fixing plate of the plate. In many countries, the copper busbar is used as the conductive busbar (BUS) on the power supply side of the circuit breaker, and the wire and cable is mostly used as the power source for the circuit breaker power supply side circuit breaker in Europe. However, the connection power supply on the power supply side of the circuit breaker, whether using copper bars or wires and cables, has almost no space between the circuit breaker and the circuit breaker inside the distribution box to add the accessory device of the auxiliary function of the circuit breaker itself. . When there is an additional demand for an accessory device, there is almost no room for construction. In most cases, it is necessary to remove the copper platoon, remove the wire, remove the fixing screws, etc., remove all the equipment, remove the circuit breaker, install the required accessories, and then fix the circuit breaker in the distribution box. , redo wiring work. In addition to causing a lot of inconvenience, this construction method may even cause a safety hazard.

In view of this, manufacturers of circuit breakers, such as world-renowned manufacturers Schneider, ABB, Siemens, singular, E-TN, SQ-D, Mitsubishi Electric, etc., respond to the customer's essential functional requirements for accessories, and the above The difficulty of actually replacing the circuit breaker in the power distribution box body was first invented by the European and American manufacturers on the top of the circuit breaker body, and a certain part of the common accessories was assembled by means of a cover-up method to solve the problem of the customer in the future. The troubles and inconveniences that arise when adding accessories must be added to functional requirements. At present, this method of solving the problem and the actual production The product is also the manufacturing method consistently followed by circuit breaker manufacturers all over the world, and is the mainstream of circuit breaker product design.

Circuit breaker products with the advancement of materials technology in the world, as well as the advancement of technology and environmental changes in the world, such as electronic information and frequency conversion technology, such as the use of nonlinear components, resulting in deterioration of power quality. Requirements, differentiated requirements, etc., in addition to the products becoming smaller, electronic, and communicable, each manufacturer has formed a variety of circuit breaker products and the size can not be standardized and unified, resulting in even the above The outer casing of the circuit breaker product is covered, but its accessories are not the same due to different sizes and specifications. As a result, the circuit breaker manufacturer's model products are complicated and cannot be unified and standardized, resulting in user material and economic waste, and it is very inconvenient for the customer to use. The only solution is to make a thorough change in the combination of methods and methods of the accessory device of the circuit breaker to overcome the above difficulties.

But the tricky thing is that in practice, because the power usage of each customer is different, the condition of using the circuit breaker is different. Even some circuit breaker manufacturers have many specifications to describe it as "chaos", which causes customers to It is difficult to add additional accessory functions to the circuit breaker, even to repair the disk, or to face the fate of having to redo the switchboard. In particular, the common indication accessories of various manufacturers, such as auxiliary contacts and alarm contacts, are sometimes not universal. And the main component micro-switch can also be faulty and will not cause an incorrect indication. In addition, the contacts that have been used for a long time have to be worn out. Therefore, in actual power operation, the correct status indication may not be obtained and the power may be dangerous. These potential crises include, for example, microswitch failures, mechanical component displacement, contactless connections, and contact splices, which can cause an error message to be displayed by an external indication status, causing users to misinterpret or even affect power usage. Security. In the same way, the condition of the electromagnetic switch is also like a circuit breaker. In the role of the auxiliary contact, it may be neglected that the contact has a gap, or the phenomenon of the joint is not known. In order to meet the needs of construction and safety, avoid the waste of resources in manufacturing, and to improve the maintenance, it is necessary to open the door and measure with the electric meter. It is necessary to remove the wire, remove the copper bar, remove the switch, etc., to eliminate the safety in manufacturing or future maintenance. Economic doubts are indeed necessary.

The most common typical construction misjudgment is that if the circuit breaker is in an open state (OFF), it can be constructed on the load side of the circuit breaker and it must be safe, but it is not, because the circuit breaker is in an open state. Construction on the load side of the circuit breaker may also cause death. There is a problem of reverse power transmission (reverse phase), or in the case of poor grounding, there is a floating voltage on the load side of the circuit breaker, which may cause a power failure. This situation is sometimes heard because there is no good basis for judging the status of the device, resulting in misjudgment by maintenance personnel, and even causing work safety accidents. Relying on the traditional old method, setting the indication and display unit of the disk surface, it is necessary to do a lot of wiring work between the circuit breaker or the electromagnetic switch, so it is necessary to spend a lot of manpower and material resources in design and manufacture. After the completion of the manufacturing, whether it is in the quality control inspection, or the future maintenance is very troublesome, it must rely on the meter instrument, plus the skilled visual inspection and experience interpretation before it can be handled, resulting in various construction operations management problems.

In view of the above reasons, the present invention proposes a device which is versatile and easy to install, but which is easy to operate and has a firm indication, can solve the above problems, and can further satisfy different needs of customers in various situations. No matter the circuit breaker or electromagnetic switch can be used, it overcomes the problems of different manufacturers, different specifications and sizes, and greatly improves the stability and economy of power consumption.

【purpose】

The main purpose of the present invention is to provide a switch contact state detecting device which is simple in structure, convenient to install, and accurate in identifying the state of the switch contact. This creation can be applied to all kinds of power switches of any brand, specification and size to solve the needs of various power switches and their accessories. This creation makes the device that can display the actual state of the switch contact correctly and easily becomes simple and feasible, and is more convenient for construction or overhaul. The creation also provides an alternative switch contact state detection device to improve the safety and economy of the use of electrical equipment.

In order to achieve the above objective, the present invention provides a switch contact state detection method, which is to measure the voltage signal of the power switch circuit power supply side and the load side of the circuit breaker through the electronic control circuit component and then send it to the microprocessor for reading. . Specifically, the switch contact state detecting method includes: setting an electronic control circuit component inside a device; electrically connecting the electronic circuit in the electronic control circuit component and the power supply side of the circuit breaker to which the detected switch belongs The load side of the circuit breaker sends the signal sensed by the electronic circuit to the microprocessor; and causes the microprocessor to judge according to the preset action state logic, and outputs the determined signal to display the corresponding result.

According to the above method, the switch contact state detecting device provided by the present invention preferably has the following basic functions: 1 phase voltage indicating function, 2 power indicating function, 3 under phase indicating, 4 reverse power indicating function, 5 closed circuit (ON), open circuit (OFF), trip (Trip) indication function; 6 contact welding indication function, 7 leakage status display, 8 overload status display, 9 phase sequence status indication, 10 accident status indication function. The above-mentioned functional facilities can be displayed together on one panel, or can be added or removed at will, and can be expanded and added with other functional facilities.

In order to achieve the power indication function and the requirements of the voltage indication functions of each phase, it is preferred. The method can electrically connect each phase power source of the switching power supply side to be measured and the phase power source of the switch load side to one of the boxes next to the switch, and pass the electronic circuit in the electronic control circuit component inside the box body. It is judged whether the incoming call is made, and the relative electrical properties are displayed and displayed on the panel, so that the functions of the voltage display and the power display of each phase of the switch contact can be achieved.

In order to achieve the under-phase status indication function, it is preferable to electrically connect the contacts on the switching power supply side and the load side to the device. If the power supply side and the load side are not equipotential, the phase-under-state can be interpreted. The switch status signal of the microprocessor output is electrically connected to the display panel, so that the above functions can be achieved.

In order to achieve the reverse power status indication function, it is preferable to electrically connect the contacts on the switching power supply side and the load side to the device. If there is no power on the power supply side, but there is a power supply on the load side, the reverse power transmission can be interpreted. State, at this time, the switch output signal of the microprocessor output is electrically connected to the display panel, so that the above functions can be achieved.

In order to achieve the ON/OFF status indication function, it is preferable to electrically connect the contacts on the switching power supply side and the load side to the device. If there is power on the power supply side and there is power on the load side, it can be interpreted as Turn off the ON state. In order to achieve the switch open state or the trip status indication function, the contacts on the switching power supply side and the load side are electrically connected to the device. If there is power on the power supply side and there is no power on the load side, it can be interpreted as a switch open state or a switch. In the state of tripping, a circuit breaker auxiliary micro switch can be added outside or inside the circuit breaker to distinguish the state of open circuit or trip. At this time, the switch output signal of the microprocessor output is electrically connected to the display. The panel can be used to achieve the above functions.

In order to achieve the switch contact welding state indication function, it is preferable to electrically connect the switch power supply side and the load side contact point to the device, and at this time, add a shunt trip coil, When the shunt trip coil is actuated, if the load side of the switch breaker is equipotential to the power source, it means that the switch contact has a fusion phenomenon. Similarly, the trip button of the switch can be manually held, and it is visually determined whether the current switch has a joint fusion phenomenon, and whether the welding must be performed under the permission, such as the old repair or the test is safe and flawless, and The system will not cause damage or malfunction due to testing.

In order to achieve the function of indicating the leakage state of the switch, it is better to know the line when the load side of the circuit breaker of the switch is added with zero current comparator or leakage detection protection 驿I≠0. Whether there is a leakage state in the circuit of the switch, at this time, the switch state signal outputted by the microprocessor is electrically connected to the display panel, so that the above function can be achieved.

In order to achieve the state that the switch can understand whether the system is overloaded, it is better to use the electromagnetic switch on the system to use the contact point of the thermal overload electric switch of the electromagnetic switch to achieve the indication state function of the overload state, and the other The implementation method is that in the design of the electronic circuit, a set circuit and a comparison circuit are provided to know whether the phenomenon is overloaded, so that the function of the overload indication state can be achieved.

In the same way, in order to achieve the indication function that the switch can have a phase sequence state, it is preferable to electrically connect the electronic circuit on the power supply side of the switch breaker, and the internal internal key has a phase sequence sequence detecting device, so that the system loop can be achieved. If the phase sequence must be interpreted, it is not necessary to use the instrument to detect and ensure the safety of the system circuit.

In order to achieve the protection function of the switch in the accident state, it is preferable to electrically connect to the electronic circuit on the switch load side and set a comparison loop of the accident value, so that the state indication at the time of the accident can be achieved. If it is not the above fault state, and it is interpreted as a trip state, it can be determined as a short circuit accident state.

The above preferred embodiment case is a detection method when the system is powered. If there is no power input in the system, the device has a backup battery pack input power supply, so that it can be detected and simplified when there is no power supply. Tested features.

The above switch contact state detecting device can be used in the normal power supply to know all the state functions, and if there is no power supply, the state can be understood by the built-in electronic circuit and the internal or external battery pack. The creation is also provided between the box body and the indication state display panel, and can also be connected by a cable connection, so that the state display panel can be indicated on the disk surface or the disk, thereby greatly improving the quality of power consumption.

10‧‧‧Circuit breaker

11‧‧‧ Circuit breaker power supply side

12‧‧‧ Circuit breaker load side

15‧‧‧Button button switch

16‧‧‧Handles

17‧‧‧Auxiliary micro switch

18‧‧‧Split trip coil

20‧‧‧Switch contact status detecting device

21‧‧‧ terminals

22‧‧‧Box

23‧‧‧Dial switch

24‧‧‧ display panel

25‧‧‧ dry contact output terminal

26‧‧‧ terminal block

27‧‧‧Terminal Block

28‧‧‧ cable

30‧‧‧Electronic circuits

32‧‧‧Microprocessor (CPU)

41‧‧‧ Under-phase indicator

42‧‧‧Reverse phase indicator

43‧‧‧ON indicator

44‧‧‧OFF indicator

45‧‧‧Trip indicator

46‧‧‧Leakage indicator

47‧‧‧Overload indicator

48‧‧‧Short-circuit indicator

49‧‧‧phase sequence indicator

50‧‧‧ welding indicator

51‧‧‧Power indicator

52‧‧‧R phase indicator

53‧‧‧S phase indicator

54‧‧‧T phase indicator

55‧‧‧N phase indicator

56‧‧‧U phase indicator

57‧‧‧V phase indicator

58‧‧‧W phase indicator

59‧‧‧G phase indicator

70‧‧‧Leakage protection

71‧‧‧ Thermal protection

72‧‧‧ Zero comparator

80‧‧‧ phase sequence protection

90‧‧‧Power storage device

91‧‧‧External power input terminal block

Fig. 1 is a schematic view showing the appearance of an embodiment of the switch contact state detecting device on the circuit breaker.

Fig. 2 is a schematic view showing the appearance of the embodiment of the switch contact state detecting device beside the circuit breaker.

Fig. 3 is a schematic view showing the appearance of an embodiment in which the display panel of the switch contact state detecting device is connected to the main body.

Fig. 4 is a logic diagram showing the operation state of the embodiment of the present switch contact state detecting device.

Fig. 5 is a flow chart showing the operation sequence of the embodiment of the present switch contact state detecting device.

Figure 6 is a circuit diagram of an electronic control circuit assembly of the embodiment of the present switch contact state detecting device.

Figure 7 is a schematic diagram of the internal device of the embodiment of the present switch contact state detecting device.

Fig. 8 is a schematic view showing an embodiment of a branch tripping coil and an auxiliary microswitch in the switch position state detecting device switch of the present invention.

According to the present switch switch state detecting device 20, a preferred embodiment of the device is implemented. As shown in FIG. 1, the switch contact state detecting device 20 is fixed above the circuit breaker 10, and the inside of the casing 22 is provided. There are electronic circuit 30, microprocessor (CPU) 32 (electronic circuit 30 and microprocessor 32 are combined into an electronic circuit control component, please refer to FIG. 6), circuit breaker power supply side 11 and circuit breaker load side 12 terminals, respectively The corresponding terminal 21 of the switch contact state detecting device 20 is electrically connected to the electronic circuit 30. Above the box 22 is a dip switch 23, which can be selected according to system requirements. At this time, the voltage value of each point to the ground can be measured by the electronic circuit 30 to see if there is a voltage value. Please refer to FIG. 6 , whether the signal with voltage value at each point is electrically connected to the microprocessor (CPU) 32, and the operation state logic table preset according to FIG. 4 is calculated to know the state of the switch contact. Its state is output by the microprocessor (CPU) 32 to the display panel 24 to control the corresponding indicator light to be turned off. Its state can be electrically connected to the dry contact output terminal 25 as an output contact for other applications.

As shown in FIG. 2, it is the second embodiment of the present invention. If there is still space on the side of the circuit breaker 10, the switch contact state detecting device 20 can be designed on the side of the circuit breaker 10. Inside the casing 22, an electronic circuit 30, a power storage device 90, a thermal protection device 71, a leakage protection device 70, a phase sequence protection device 80, and a microprocessor (CPU) 32 (see Fig. 7) are provided. The terminals of the power supply side 11 and the circuit breaker load side 12 are electrically connected to the electronic circuit 30 to the corresponding terminals 21 of the switch contact state detecting device 20, respectively. Above the box 22 is a dip switch 23, which can be selected according to system requirements. At this time, the voltage value of each point to the ground can be measured by the electronic circuit 30 to see if there is a voltage value. Please refer to FIG. 6 , whether the signal with voltage value at each point is electrically connected to the microprocessor (CPU) 32, and the operation state logic table preset according to FIG. 4 is calculated to know the state of the switch contact. Its state is output by the microprocessor (CPU) 32 to the display panel 24 to control the corresponding indicator light to be turned off. Its state can be electrically connected to the dry contact output terminal 25 for output connection of other applications. point. The code and function of the switch contact state detecting device 20 are the same as in FIG.

Referring to FIG. 3, it is the third embodiment of the present invention. For example, when some applications have to check the state of the switch contact on the surface of the power distribution box, the display panel 24 of the switch contact state detecting device 20 must be Separate design from the box body 22. The display panel 24 and the casing 22 are each provided with a signal connection terminal block 26 and a terminal block 27 which are designed in a male-female foolproof manner, and are connected via a cable 28 so that the display panel 24 can be mounted on the desired side. Corresponding location.

As shown in FIG. 4, a schematic diagram of the system circuit of the switch position state detecting device 20 and a corresponding action state logic table are shown. Through the measurement by the electronic circuit 30, it can be known whether the voltages of the respective phases of the circuit breaker power supply side 11 and the circuit breaker load side 12 are present. The measured signal of each phase voltage is sent to the microprocessor (CPU) 32, and the state of the switch contact is known via the operating state logic table. For example, the first column of the circuit breaker power supply side 11 and the circuit breaker load side 12 have voltages present in each phase, which represents that the switch state is ON. At this time, the indicator of the display panel 24 has a power indicator 51, an ON indicator 43, an R-phase indicator 52, an S-phase indicator 53, a T-phase indicator 54, an N-phase indicator 55, and a U-phase indicator 56. The lights of the V-phase indicator light 57, the W-phase indicator light 58, and the G-phase indicator light 59 are illuminated. Whether it is a fusion or not can be further determined when the test is allowed or repaired at a later age (described later).

For example, when the voltages of the respective phases enter the electronic circuit 30, when there is a voltage on the power supply side 11 of the circuit breaker and there is no voltage phenomenon in the voltage of each phase of the load side of the circuit breaker 12, the microprocessor (CPU) 32 outputs a signal to the display panel 24, The under-phase indicator light 41 is illuminated. A microprocessor (CPU) 32 outputs a signal representative of the state of the switch and is coupled to the dry contact output terminal 25 for use as an output contact for other applications.

Similarly, when the voltages of the above phases are sent to the microprocessor (CPU) 32 via the electronic circuit 30, according to the functional requirements on the logic table of the operation state, when the power supply side 11 of the circuit breaker has no voltage. When there is a voltage on the load side 12 of the circuit breaker, the phenomenon of reverse power transmission can be interpreted at this time, and the microprocessor (CPU) 32 outputs a signal to the display panel 24 to illuminate the reverse phase indicator light 42. A microprocessor (CPU) 32 outputs a signal representative of the state of the switch and is coupled to the dry contact output terminal 25 for use as an output contact for other applications.

After the voltages of the respective phases are sent to the microprocessor (CPU) 32 via the electronic circuit 30, according to the functional requirements on the operating state logic table, when the power supply side 11 of the circuit breaker has power and the load side 12 of the circuit breaker has no power supply, there is Two possibilities, one is the state of the open circuit (OFF), and the other is the state of the trip. At this time, the signal enters the internal microprocessor (CPU) 32. If it is better on the circuit breaker 10, there is an auxiliary micro switch 17 in the internal position of the circuit breaker 10, and an auxiliary micro switch 17 in the OFF position. (Refer to Figure 8) When there is an action, it means that it is currently in the OFF state. If not, it means that it is currently in a state of trip. At this time, the microprocessor (CPU) 32 outputs a signal to the display panel 24 to turn off the OFF indicator 44 or the Trip indicator 45, and the microprocessor 32 outputs a signal representing the state of the switch, and is connected to the dry contact output terminal 25, As an output contact for other applications.

As described above, when both the circuit breaker power supply side 11 and the circuit breaker load side 12 have a voltage signal, it indicates that the switch state signal is closed (ON) or welded. During the test, the branch trip coil 18 can be arranged inside the circuit breaker 10 (refer to FIG. 8). Under the premise that the circuit breaker 10 is tripped, the microprocessor (CPU) 32 sends the split trip coil 18 The triggered control signal causes the tripping coil to operate. At this time, if there is no voltage on the load side 12 of the circuit breaker, it means that the contact of the circuit breaker 10 is not welded, and when there is still a voltage source on the load side 12 of the circuit breaker, the circuit breaker 10 is connected. The point is already welded. If the branch trip coil 18 is not added, the trip button switch 15 on the circuit breaker 10 can be pressed in a manual manner. If the trip button switch 15 is pressed, the ON indicator 43 is always on, indicating For the welding state, The fusion indicator light 50 lights up.

According to the design of the present switch contact state detecting device 20, a zero comparator 72 can be added to the circuit breaker power supply side 11 and the circuit breaker load side 12 (refer to FIG. 6), if the circuit breaker power supply side 11 input The current is not equal to the output current of the load side of the circuit breaker 12, that is, ΣI ≠ 0, so that it can be understood whether there is a leakage condition. At this time, the microprocessor (CPU) 32 outputs a signal to the display panel 24 to cause the leakage indicator 46 to light up, and the microprocessor (CPU) 32 outputs a signal representing the state of the switch, and is connected to the dry contact output terminal 25 to do Output contacts for other applications. Another embodiment is (refer to FIG. 7). If the leakage protection device 70 is externally connected, when the leakage state occurs, the contact signal of the leakage protection device 70 is input to the switch contact state detecting device. 20 internal microprocessor (CPU) 32 for interpretation, can also achieve the above functions.

In the same way, according to the design of the switch contact state detecting device 20 of the present invention, if a heat protection device 71 is designed (refer to FIG. 7), when the overload occurs, the heat protection device 71 acts, and the heat is accumulated. The contact signal of the protection switch 71 is input to the microprocessor (CPU) 32 inside the switch contact state detecting device 20 for interpretation to indicate overload (refer to Fig. 6). At this time, the microprocessor (CPU) 32 outputs a signal to the display panel 24 to cause the overload indicator 47 to light up, and the microprocessor (CPU) 32 outputs a signal representing the state of the switch, and is connected to the dry contact output terminal 25 to do Output contacts for other applications.

According to the design of the switch contact state detecting device 20, if the phase sequence protection device 80 is designed (refer to FIG. 7), the action state contact is directly input to the switch contact state detecting device 20, And the internal microprocessor (CPU) 32 makes an interpretation. At this time, the microprocessor (CPU) 32 outputs a switch status signal to the display panel 24 to cause the phase sequence indicator 49 to illuminate, and the microprocessor (CPU) 32 outputs the representative switch. Status signal and connected to dry contact output terminal 25 for other applications Output contact.

According to the design of the present switch contact state detecting device 20, when the voltage source input of the circuit breaker power supply side 11 and the circuit breaker load side 12 enters the internal microprocessor (CPU) 32 for analysis and comparison, if it is not the fourth figure The switch state of the action state logic table indicates the accident state. At this time, the microprocessor (CPU) 32 sends a set of signals to the display panel 24 to make the short-circuit indicator 48 light, and the microprocessor (CPU) 32 outputs a signal representing the state of the switch, and is connected to the dry contact output terminal 25. As an output contact for other applications.

The switching state detection principle described above mainly determines that the core is a microprocessor (CPU) 32, and the program execution flow chart of the microprocessor (CPU) 32 is as shown in FIG.

In the design of the switch contact state detecting device 20, in principle, when the power supply side 11 of the circuit breaker has a power supply, the above-mentioned actions are achieved as scheduled, and the external power source is connected via the external power input terminal block 91. However, when there is no external power input, the switch contact state detecting device 20 is not functionally usable. Therefore, a set of power storage devices 90 is disposed inside the switch contact state detecting device 20, when the external power supply fails. The power storage device 90 can also be powered to make the switch contact state detecting device 20 operate normally, and the appearance is as shown in FIG.

In summary, the creation of the switch contact state detecting device can be installed next to each switch, and the cable can be connected to the disk surface, and the phase sequence of the power supply side of the circuit breaker and the load side of the circuit breaker is measured through the periphery of the electronic circuit and the like. Voltage, current, protection power, etc., and the microprocessor (CPU) determines the switch state according to the action logic state table to display on the display panel, and has a dry contact output terminal, through the internal mechanical structure and internal control components It can solve the application of various special needs and make full use of the industry. Moreover, the relevant products in the market and the approved patent announcements do not see the same technical characteristics as the essence of this creation, and also meet the novelty and progress. Legal statutory Li application requirements. To apply for a patent application in accordance with the law, you are requested to give the examination committee an early grant of the patent to ensure the applicant's rights and interests. However, the only one disclosed in this case is the preferred embodiment of this creation. It is not possible to limit the scope of the creation of this creation. Any equivalent change or modification made in accordance with the spirit of this creation still covers the scope of patent application for this creation. in.

10‧‧‧Circuit breaker

11‧‧‧ Circuit breaker power supply side

12‧‧‧ Circuit breaker load side

15‧‧‧Button button switch

16‧‧‧Handles

20‧‧‧Switch contact status detecting device

21‧‧‧ terminals

22‧‧‧Box

23‧‧‧Dial switch

24‧‧‧ display panel

25‧‧‧ dry contact output terminal

41‧‧‧ Under-phase indicator

42‧‧‧Reverse phase indicator

43‧‧‧ON indicator

44‧‧‧OFF indicator

45‧‧‧Trip indicator

46‧‧‧Leakage indicator

47‧‧‧Overload indicator

48‧‧‧Short-circuit indicator

49‧‧‧phase sequence indicator

50‧‧‧ welding indicator

51‧‧‧Power indicator

52‧‧‧R phase indicator

53‧‧‧S phase indicator

54‧‧‧T phase indicator

55‧‧‧N phase indicator

56‧‧‧U phase indicator

57‧‧‧V phase indicator

58‧‧‧W phase indicator

59‧‧‧G phase indicator

Claims (10)

A switch contact state detecting device comprises: an electronic control circuit component for detecting a voltage signal state of a switch power supply side and a load side contact; a box body housing the electronic control circuit component, the box body having a set of terminals for connection The electronic control circuit component, the terminal on the switching power supply side, and the terminal on the switch load side; and a display panel are electrically connected to the electronic control circuit component. The switch contact state detecting device according to claim 1, wherein the electronic control circuit component accommodated in the casing comprises: an electronic circuit for sensing a voltage signal of the power source side and the load side of the switch; A microprocessor is configured to determine a switch contact state according to at least an input signal of the electronic circuit, and electrically connect the switch contact state to the display panel to display a switch contact state. The switch contact state detecting device according to claim 2, wherein the built-in program of the microprocessor accommodated in the box is based on the detected voltage signals of the phase sequence of the switching power supply side and the load side. The presence or absence, overloaded thermal power, leakage protection, or phase-sequence protection of the signal contacts, at least one of the above factors to determine the state of the junction of the calculation switch. The switch contact state detecting device according to claim 2, wherein the electronic circuit is electrically connected to the power supply side of the switch, the phase sequence of the load side and the ground, and is divided by a resistor in series. The rectifying element is a voltage dividing rectifying element having a plurality of resistors connected in series to each other, and the phase sequence of the electronic circuit is electrically and non-powered to the microprocessor. The switch contact state detecting device according to claim 2, wherein the microprocessor electrically connects the switch contact state to the dry contact output terminal. The switch contact state detecting device according to claim 1, wherein the display panel is separably disposed from the casing, and the casing and the display panel are connected by a wire. The switch contact state detecting device according to claim 1, wherein the box body is further provided with a dip switch for switching the number of phases of the input power source. The switch contact state detecting device according to claim 1, wherein the display panel displays items including: power supply, phase voltage, closing, breaking, tripping, owing phase, reverse phase, leakage, At least one of overload, phase sequence, fusion or short circuit. The switch contact state detecting device according to claim 1, wherein the casing further has an internal power storage device and an external power input terminal block. For example, the switch contact state detecting device described in claim 1 can be connected to the internal split shunt coil inside the switch, and an auxiliary micro switch to make the switch trip when the system fails.