Relay protection simulated circuit breaker circuit and relay protection simulated circuit breaker hanging box

Abstract

The utility model discloses a relay protection simulation circuit breaker circuit and a relay protection simulation circuit breaker hanging box, wherein the L end of the power line is connected to the first end of the normally closed contact of the automatic opening relay KA via the normally closed contact of the opening button SB, the second end of the normally closed contact of the automatic opening relay KA is respectively connected to the normally open contact of the closing button SB, the normally open contact of the automatic closing relay KA, and the first end of the first group of normally open contacts of the AC contactor KM, the normally open contact of the closing button SB, the normally open contact of the automatic closing relay KA, and the second end of the first group of normally open contacts of the AC contactor KM are respectively connected to the first end of the coil of the AC contactor KM, and the second end of the coil of the AC contactor KM is connected to the N end of the power line. The device not only has low equipment cost, but also has rich practical training project functions, can meet the needs of various practical training projects and improve practical training effects.

Description

Technical Field

[0001] The utility model belongs to the technical field of simulated circuit breaker training devices, and in particular relates to a relay protection simulated circuit breaker circuit and a relay protection simulated circuit breaker hanging box. Background Art

[0002] The simulated circuit breaker is mainly used for the whole group test of the power system power failure protection device or the complete set of relay protection screens, and can truly simulate the tripping and closing of the circuit breaker. During the whole group test, the tripping and closing of the high-voltage circuit breaker are simulated to avoid the adverse effects caused by repeated opening and closing of the circuit breaker due to repeated whole group tests. It is especially suitable for newly built substations to truly simulate the switching action characteristics of the circuit breaker.

[0003] In the relevant existing technologies, the cost of using industrial-grade circuit breakers during training is relatively high, and the functions of existing industrial-grade circuit breakers are fixed and cannot be flexibly adapted. However, during training, in order to allow trainees to simulate training projects under different working conditions, the simulated circuit breakers often need to have functions that industrial-grade simulated circuit breakers do not have, such as automatic closing functions. Although these functions may generally not be needed during actual applications, expanding the functions of simulated circuit breakers is conducive to trainees having a better understanding of the working principles and action characteristics of circuit breakers, thereby further improving the training effect. Based on the existing industrial-grade circuit breakers, which are not only costly, but also do not have the flexible functions required for training, and cannot simulate the various required training projects, there is a need for a simulated circuit breaker that is low in cost, can achieve functional flexibility and can meet the needs of training. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the above-mentioned prior art and to provide a relay protection simulated circuit breaker circuit and a relay protection simulated circuit breaker hanging box. The device is tightly fitted with the simulated circuit breaker required in the relay protection teaching equipment, and the simulated circuit breaker required for relay protection is composed of various small components. The device not only has low equipment cost, but also has rich training project functions, can meet the needs of various training projects and improve the training effect.

[0005] To achieve the above-mentioned objectives, one of the objectives of the utility model is to provide a relay protection simulation circuit breaker circuit, including a power line, an opening button SB, a closing button SB, a closing relay KA, an opening relay KA and an AC contactor KM, the L end of the power line is connected to the first end of the normally closed contact of the opening relay KA via the normally closed contact of the opening button SB, the second end of the normally closed contact of the opening relay KA is respectively connected to the normally open contact of the closing button SB, the normally open contact of the closing relay KA, and the first end of the first group of normally open contacts of the AC contactor KM, the second ends of the normally open contact of the closing button SB, the normally open contact of the closing relay KA, and the first group of normally open contacts of the AC contactor KM are respectively connected to the first end of the coil of the AC contactor KM, and the second end of the coil of the AC contactor KM is connected to the N end of the power line.

[0006] As a preferred embodiment, it also includes a closing indicator light P and an opening indicator light P, wherein the closing indicator light P is arranged in parallel with the coil of the AC contactor KM, the first end of the closing indicator light P is electrically connected to the normally open contact of the closing button SB, the normally open contact of the closing relay KA and the second end of the first group of normally open contacts of the AC contactor KM, respectively, the first end of the opening indicator light P is electrically connected to the second end of the opening relay KA through the first group of normally closed contacts of the AC contactor KM, and the second ends of the closing indicator light P, the opening indicator light P and the coil of the AC contactor KM are connected to the N end of the power line.

[0007] As a preferred embodiment, the first end of the coil of the closing relay KA is electrically connected to the external power supply terminal socket II, the second end of the coil of the closing relay KA is connected to one end of the second group of normally closed contacts of the AC contactor KM, and the other end of the second group of normally closed contacts of the AC contactor KM is electrically connected to the external power supply terminal socket I.

[0008] As a preferred embodiment, the first end of the coil of the disconnecting relay KA is electrically connected to the external power supply terminal socket IV, the second end of the coil of the disconnecting relay KA is connected to one end of the second group of normally open contacts of the AC contactor KM, and the other end of the second group of normally open contacts of the AC contactor KM is electrically connected to the external power supply terminal socket III.

[0009] As a preferred solution, the connection terminals of the AC contactor KM are respectively connected to the external terminal sockets through wires, so that the external training module can be plug-connected with the AC contactor KM through the external terminal sockets.

[0010] The second purpose of the utility model is to provide a relay protection simulated circuit breaker hanging box, including any one of the relay protection simulated circuit breaker circuits described above.

[0011] As a preferred solution, it also includes a hanging box shell, in which the relay protection simulation circuit breaker circuit and its electrical components are arranged.

[0012] As a preferred solution, a hanging box operation panel is provided on one side wall of the hanging box shell; the hanging box operation panel includes a first control unit and a second control unit, the first control unit and the second control unit have the same structure, and the first control unit and the second control unit are correspondingly provided with external power supply terminal sockets and external terminal sockets, and the external power supply terminal sockets and the external terminal sockets are respectively electrically connected to the relay protection simulation circuit breaker circuit through wires.

[0013] As a preferred solution, a closing button SB, a closing indicator light P, an opening button SB and an opening indicator light P are fixedly arranged in the corresponding areas of the first control unit and the second control unit of the hanging box operation panel, respectively, wherein the closing indicator light P is located in the closing button SB, and the opening indicator light P is located in the opening button SB, which are used to indicate the working status of the closing button SB and the opening button SB, respectively.

[0014] Compared with the prior art, the utility model has at least the following beneficial effects:

[0015] First, the utility model optimizes and improves the structure, and uses logic circuits to combine corresponding small electrical components and equipment into a simulated circuit breaker required in the relay protection training process, which closely meets the needs of various training functions, not only reducing the equipment investment cost, but also achieving flexibility in training projects and effectively meeting the needs of various training projects. The simulated circuit breaker of this scheme can be used in conjunction with various training modules and can also be used with microcomputer protection.

[0016] Secondly, this scheme takes into account the actual needs of the training process. The function of automatic closing and opening switches needs to be connected to the external power supply connector through plugging. Therefore, by designing the power supplies of manual closing and opening switches and automatic closing and opening switches separately, it avoids the problem of short-circuit safety accidents caused by incorrect plugging of the power plug when using a three-phase power supply during external training operations.

[0017] Third, the utility model also provides a simulated circuit breaker hanging box, in which the circuit of the simulated circuit breaker is arranged, and a hanging box operation panel is arranged on the hanging box shell, and external power supply terminal sockets and external terminal sockets are arranged on the hanging box operation panel, and the external power supply terminal sockets and external terminal sockets are electrically connected to the circuit contacts corresponding to the simulated circuit breaker through wires, so that the circuit breaker has the functions of automatic opening and closing, so that the trainees have a clearer understanding of the action characteristics of the circuit breaker under different electrical plug-in states according to the needs of the training project. The external terminal socket is electrically connected to the external training module to meet the needs of various training projects. The external power supply terminal socket and the external terminal socket in this solution are connected by plug connectors and sockets. Through the plug-in operation, the trainees have a clearer understanding of the working principle of the device during the hands-on operation.

[0018] Fourthly, in this solution, a silk-screen diagram is arranged on the hanging box operation panel, which can clearly show the connection method of the corresponding socket parts and the functional principle of the simulated circuit breaker it realizes, so as to improve the corresponding training effect.

[0019] Fifth, after structural improvement, this scheme makes the simulated circuit breaker not only have the function of automatic opening, but also has an automatic closing function specially set to meet the requirements of practical training functions, thereby making the practical training projects more diversified and meeting the practical training needs of various projects. It not only reduces the equipment cost, but also makes the practical training projects more diversified, thereby improving the practical training effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the relay protection simulation circuit breaker circuit corresponding to the first control unit of the utility model;

[0022] Figure 2 It is a schematic diagram of the relay protection simulation circuit breaker circuit corresponding to the second control unit of the utility model;

[0023] Figure 3 This is the wire connection diagram of the AC contactor KM1 of the utility model;

[0024] Figure 4 This is the wire connection diagram of the AC contactor KM2 of the utility model;

[0025] Figure 5 This is a structural diagram of the hanging box operation panel of the utility model;

[0026] Figure 6 It is a schematic diagram of the electrical connection between the terminal socket of the hanging box operation panel and the AC contactor through wires;

[0027] Markings in the figure: 1. hanging box operation panel, 2. wire, 10. external power supply terminal socket, 101. external power supply terminal socket I, 102. external power supply terminal socket II, 103. external power supply terminal socket III, 104. external power supply terminal socket IV, 11. closing button, 12. opening button, 15. external terminal socket, 100. first control unit, 200. second control unit. DETAILED DESCRIPTION

[0028] The present invention is described in detail below by means of exemplary embodiments. However, it should be understood that, without further description, the elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0029] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this document shall have the usual meanings understood by people with ordinary skills in the field to which the utility model belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of the utility model do not express quantitative limitations, but indicate the existence of at least one. The words "include" or "comprise" and the like indicate that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, but do not exclude other elements or objects with the same function.

[0030] like Figure 1As shown, the utility model provides a relay protection simulation circuit breaker circuit, including a power line, an opening button SB, a closing button SB, a closing relay KA, an opening relay KA and an AC contactor KM. First, the power line can adopt a three-core line, which is used as a power supply for manual tripping and closing. The L end of the three-core power line is connected to one end of the normally closed contact of the opening button SB through the normally closed contact of the opening button SB. The L end of the three-core power line needs to pass through the normally closed contact of the opening button SB and the normally closed contact of the opening relay KA to ensure that the manual opening can be carried out. The other end of the normally closed contact of the opening relay KA is respectively connected to the normally closed contact of the closing relay KA. The normally open contact of the switching button SB, the normally open contact of the closing relay KA, the first group of normally open contacts of the AC contactor KM, and one end of the first group of normally closed contacts of the AC contactor KM are connected, and the other ends of the normally open contact of the closing button SB, the normally open contact of the closing relay KA, and the first group of normally open contacts of the AC contactor KM are respectively connected to the first end of the coil of the AC contactor KM and the first end of the closing indicator light P, the other end of the first group of normally closed contacts of the AC contactor KM is connected to the first end of the opening indicator light P, and the second end of the closing indicator light P, the second end of the opening indicator light P, and the second end of the coil of the AC contactor KM are connected to the three-core power cord N.

[0031] In this scheme, a group of normally closed contact output ends of the opening relay KA are respectively connected to the four groups of switch contacts connected in parallel, wherein the first group of switch contacts are the normally open contacts of the closing button SB, the second group of switch contacts are the normally open contacts of the automatic closing relay KA, the third group of switch contacts are the normally open contacts of the AC contactor KM, which are used for self-locking, and the fourth group of switch contacts are the normally closed contacts of the AC contactor KM, which are used to control the opening indicator light P. The other ends of the automatic closing relay KA, the AC contactor KM, and the closing button SB are respectively connected to the coil of the AC contactor KM and the closing indicator light P, and the other end of the normally closed contact of the AC contactor KM is connected to the opening indicator light P, and then returned to the N end of the three-core power cord.

[0032] In order to realize the automatic closing function of this scheme, it is necessary to first introduce the external power supply terminals L and N into the power supply part, wherein the external power supply terminal L passes through a group of normally closed contacts of the AC contactor KM, and then passes through the coil of the automatic closing relay KA to be electrically connected to the other external power supply terminal N, thereby realizing the automatic closing function; specifically, the external power supply terminal adopts an electric plug, and the corresponding position of the circuit part is led out with an external power supply terminal socket part 10 through a wire 2, and the external power supply terminal socket part 10 includes an external power supply terminal socket part I101 and an external power supply terminal socket part II102. Through the cooperation of the electric plug and the electric socket part, the power supply connection of the automatic closing function is realized. It should be pointed out that: the external power supply terminal plug adopts three-phase AC power supply, and the external power supply terminals L and N can be correspondingly plugged into the external power supply terminal socket part I101 and the external power supply terminal socket part II102, or the external power supply terminals L and N can be correspondingly plugged into the external power supply terminal socket part II102 and the external power supply terminal socket part I101.

[0033] In order to realize the automatic tripping function of this scheme, it is necessary to first introduce the external power supply terminals L and N, wherein the external power supply terminal L passes through a group of normally open contacts of the AC contactor KM, and then passes through the coil of the automatic tripping relay KA to be electrically connected to the other external power supply terminal N, thereby realizing the automatic tripping function; specifically, the external power supply terminal adopts an electric plug, and the corresponding position of the circuit part leads to an external power supply terminal socket 10, and the external power supply terminal socket 10 includes an external power supply terminal socket III 103 and an external power supply terminal socket IV 104. Through the cooperation of the electric plug and the electric socket, the power supply connection of the automatic tripping function is realized. It should be pointed out that: the external power supply terminal plug adopts three-phase AC power supply, and the external power supply terminal L and N can be correspondingly plugged into the external power supply terminal socket III 103 and the external power supply terminal socket IV 104, or the external power supply terminal L and N can be correspondingly plugged into the external power supply terminal socket IV 104 and the external power supply terminal socket III 103.

[0034] The utility model avoids the problem of short-circuit safety accidents that are easy to occur when three-phase power is used during external training operations by designing the power supply of manual closing and opening switches separately from the power supply of automatic closing and opening switches. In the prior art, if the L end of the power line is designed in parallel with the power supply end of the automatic closing and opening switch, and the plug-in connection method of this solution is adopted, in this case, when the three-phase AC plug connector of the external power supply is plugged in, it is easy to cause a short-circuit accident of the two-phase line. Therefore, this solution is based on the design of automatic closing and opening switches realized by plug-in power supply, and the power supply of the automatic closing and opening switches and the manual closing and opening switches are designed separately, so as to avoid the problem of short-circuit safety accidents in the plug-in operation when three-phase AC power is used.

[0035] A typical embodiment of the utility model also provides a relay protection simulation circuit breaker hanging box, including a hanging box housing and the above-mentioned relay protection simulation circuit breaker circuit, wherein the relay protection simulation circuit breaker circuit and the corresponding electrical components on the circuit are arranged and installed in the hanging box housing (not shown in the figure), the hanging box housing is a rectangular box-shaped structure, and a heat dissipation hole is arranged on the side wall of the hanging box housing, and a hanging box operation panel 1 is arranged on the operation side of the hanging box housing, and the hanging box operation panel 1 is provided with a manual closing and opening button SB and a closing indicator light P and an opening indicator light P corresponding to the closing and opening buttons. The above-mentioned manual closing button 11, closing indicator light P, manual opening button 12 and opening indicator light P all refer to the corresponding electrical components in the relay protection simulation circuit breaker circuit; specifically, the closing indicator light P is installed in the manual closing button 11, so as to be used for manual closing indication, and the closing indicator light is a button green light, and the opening indicator light P is installed in the manual opening button 12, so as to be used for manual opening indication, and the opening indicator light is a button red light.

[0036] In this solution, the hanging box operation panel 1 is also provided with external power supply terminal socket parts Ⅰ101 and external power supply terminal socket parts Ⅱ102 for realizing the automatic closing function. The external power supply terminal socket parts Ⅰ101 and external power supply terminal socket parts Ⅱ102 are respectively used for electrical connection with the L end and N end of the external power supply terminal, so that the hanging box has the function of automatic closing through electrical connection during the training process. The hanging box operation panel 1 is also provided with external power supply terminal socket parts Ⅲ103 and external power supply terminal socket parts Ⅳ104 for realizing the automatic opening function. The external power supply terminal socket parts Ⅲ103 and external power supply terminal socket parts Ⅳ104 are respectively used for electrical connection with the L end and N end of the external power supply terminal, so that the hanging box has the function of automatic opening through electrical connection during the training process.

[0037] In this solution, as shown in the figure, 5 groups of external terminal sockets 15 electrically connected to the AC contactor KM through the wire 2 are arranged in parallel. The AC contactor KM includes a main contact and an auxiliary contact, wherein one end of the main contact is connected to the power supply, and the other end is electrically connected to the load module. The auxiliary contact is used in the circuit of the self-locking interlocking function. When the circuit breaker is simulated to be opened, as shown in the figure, the terminals in the AC contactor are 4 closing, 1 tripping, 5 closing, 2 tripping, and 3 tripping; when the circuit breaker is simulated to be closed, the terminals in the AC contactor become 1 closing, 4 tripping, 2 closing, 5 tripping, and 3 closing.

[0038] In this solution, taking into account the need to further reduce equipment costs during the training process, two parallel operating units are arranged on the hanging box operation panel 1, namely a first control unit 100 and a second control unit 200, wherein the first control unit 100 corresponds to the relay protection simulation circuit breaker circuit I, and the second control unit 200 corresponds to the relay protection simulation circuit breaker circuit II, and the structures and working principles of the relay protection simulation circuit breaker circuits I and II are the same.

[0039] The following is a detailed description of the connection relationship and working principle of relay protection simulation circuit breaker circuits Ⅰ and Ⅱ:

[0040] In this scheme, the relay protection simulation circuit breaker circuit I includes a power line, an opening button SB2, a closing button SB1, a closing relay KA1, an opening relay KA2 and an AC contactor KM1. The L end of the three-core power line needs to first pass through the normally closed contact of the opening button SB2 and the normally closed contact of the opening relay KA2 to ensure that the manual and automatic opening can be achieved. The other end of the normally closed contact of the opening relay KA2 is respectively connected to the normally open contact of the closing button SB1, the normally open contact of the closing relay KA1, the first group of normally open contacts of the AC contactor KM1, and the AC One end of the first group of normally closed contacts of contactor KM1 is connected, the normally open contacts of closing button SB1, the normally open contacts of closing relay KA1 and the other ends of the first group of normally open contacts of AC contactor KM1 are respectively connected to the first end of the coil of AC contactor KM1 and the first end of closing indicator light P1, the other end of the first group of normally closed contacts of AC contactor KM1 is connected to the first end of opening indicator light P2, the second end of closing indicator light P1, the second end of opening indicator light P2 and the second end of the coil of AC contactor KM1 are connected to the N end of the three-core power cord. External power supply terminal socket part Ⅰ101, the second group of normally closed contacts of AC contactor KM1, the coil of closing relay KA1 and external power supply terminal socket part Ⅱ102 are connected in series in sequence. The L-end and N-end electrical plug connectors of the external power supply terminal are respectively plugged into the external power supply terminal socket part Ⅰ101 and the external power supply terminal socket part Ⅱ102, so that the circuit has an automatic closing function, the external power supply terminal socket part Ⅲ103, the second group of normally open contacts of the AC contactor KM1, the coil of the opening relay KA2 and the external power supply terminal socket part Ⅳ104 are connected in series in sequence, and the L-end and N-end electrical plug connectors of the external power supply terminal are respectively plugged into the external power supply terminal socket part Ⅲ103 and the external power supply terminal socket part Ⅳ104, so that the circuit has an automatic opening function.

[0041] In this scheme, the relay protection simulation circuit breaker circuit II includes a power line, an opening button SB4, a closing button SB3, a closing relay KA3, an opening relay KA4 and an AC contactor KM2. The L end of the three-core power line needs to pass through the normally closed contact of the opening button SB4 and the normally closed contact of the opening relay KA4 to ensure that the manual and automatic opening can be achieved. The other end of the normally closed contact of the opening relay KA4 is respectively connected to the normally open contact of the closing button SB3, the normally open contact of the closing relay KA3, the first group of normally open contacts of the AC contactor KM2, and the AC One end of the first group of normally closed contacts of the contactor KM2 is connected, the normally open contacts of the closing button SB3, the normally open contacts of the closing relay KA3, and the other ends of the first group of normally open contacts of the AC contactor KM2 are respectively connected to the first end of the coil of the AC contactor KM2 and the first end of the closing indicator light P3, the other end of the first group of normally closed contacts of the AC contactor KM2 is connected to the first end of the opening indicator light P4, the second end of the closing indicator light P3, the second end of the opening indicator light P4 and the second end of the coil of the AC contactor KM2 are connected to the N end of the three-core power cord. The external power supply terminal socket part Ⅰ101, the second group of normally closed contacts of the AC contactor KM2, the coil of the closing relay KA3 and the external power supply terminal socket part Ⅱ102 are connected in series in sequence, and the L end and N end electrical plug connectors of the external power supply terminal are respectively plugged into the external power supply terminal socket part Ⅰ101 and the external power supply terminal socket part Ⅱ102, so that the circuit has an automatic closing function. The external power supply terminal socket III 103, the second group of normally open contacts of the AC contactor KM2, the coil of the tripping relay KA4 and the external power supply terminal socket IV 104 are connected in series in sequence, and the L-end and N-end electrical plug connectors of the external power supply terminal are respectively plugged into the external power supply terminal socket III 103 and the external power supply terminal socket IV 104, so that the circuit has an automatic tripping function.

[0042] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Relay protection simulated circuit breaker circuit, characterized in that: It includes a power line, an opening button SB, a closing button SB, a closing relay KA, an opening relay KA and an AC contactor KM. The L end of the power line is connected to the first end of the normally closed contact of the opening relay KA via the normally closed contact of the opening button SB, the second end of the normally closed contact of the opening relay KA is respectively connected to the normally open contact of the closing button SB, the normally open contact of the closing relay KA and the first end of the first group of normally open contacts of the AC contactor KM, the second ends of the normally open contact of the closing button SB, the normally open contact of the closing relay KA and the first group of normally open contacts of the AC contactor KM are respectively connected to the first end of the coil of the AC contactor KM, and the second end of the coil of the AC contactor KM is connected to the N end of the power line.

2. The relay protection simulated circuit breaker circuit according to claim 1, characterized in that: It also includes a closing indicator light P and an opening indicator light P, wherein the closing indicator light P is arranged in parallel with the coil of the AC contactor KM, the first end of the closing indicator light P is electrically connected to the normally open contact of the closing button SB, the normally open contact of the closing relay KA and the second end of the first group of normally open contacts of the AC contactor KM, respectively, the first end of the opening indicator light P is electrically connected to the second end of the opening relay KA through the first group of normally closed contacts of the AC contactor KM, and the second ends of the closing indicator light P, the opening indicator light P and the coil of the AC contactor KM are connected to the N end of the power line.

3. The relay protection simulated circuit breaker circuit according to claim 2, characterized in that: The first end of the coil of the closing relay KA is electrically connected to the external power supply terminal socket II, the second end of the coil of the closing relay KA is connected to one end of the second group of normally closed contacts of the AC contactor KM, and the other end of the second group of normally closed contacts of the AC contactor KM is electrically connected to the external power supply terminal socket I.

4. The relay protection simulated circuit breaker circuit according to claim 2, characterized in that: The first end of the coil of the disconnecting relay KA is electrically connected to the external power supply terminal socket IV, the second end of the coil of the disconnecting relay KA is connected to one end of the second group of normally open contacts of the AC contactor KM, and the other end of the second group of normally open contacts of the AC contactor KM is electrically connected to the external power supply terminal socket III.

5. The relay protection simulated circuit breaker circuit according to any one of claims 1 to 4, characterized in that: The connection terminals of the AC contactor KM are respectively connected to the external terminal sockets through wires, so that the external training module can be plug-connected with the AC contactor KM through the external terminal sockets.

6. Relay protection simulated circuit breaker hanging box, characterized by: The invention comprises the relay protection simulation circuit breaker circuit as described in any one of claims 1 to 5.

7. The relay protection simulated circuit breaker hanging box according to claim 6, characterized in that: It also includes a hanging box shell, in which the relay protection simulation circuit breaker circuit and its electrical components are arranged.

8. The relay protection simulated circuit breaker hanging box according to claim 7, characterized in that: A hanging box operation panel is arranged on one side wall of the hanging box shell; the hanging box operation panel includes a first control unit and a second control unit, the first control unit and the second control unit have the same structure, and the first control unit and the second control unit are correspondingly provided with an external power supply terminal socket and an external terminal socket, and the external power supply terminal socket and the external terminal socket are respectively electrically connected to the relay protection simulation circuit breaker circuit through wires.

9. The relay protection simulated circuit breaker hanging box according to claim 8, characterized in that: A closing button SB, a closing indicator light P, an opening button SB and an opening indicator light P are fixedly arranged in the corresponding areas of the first control unit and the second control unit of the hanging box operation panel, respectively, wherein the closing indicator light P is located in the closing button SB, and the opening indicator light P is located in the opening button SB, which are used to indicate the working status of the closing button SB and the opening button SB respectively.

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