Communication backpack and circuit breaker

Abstract

The utility model provides a communication backpack and a circuit breaker. The communication backpack is applied to the circuit breaker. The input end of the communication backpack is used for obtaining three-phase voltage from the circuit breaker, and the output end of the communication backpack is used for outputting a tripping signal used for controlling the circuit breaker to complete tripping. The communication backpack can judge whether the three-phase voltage triggers voltage protection or not according to whether the three-phase voltage meets preset conditions or not. Moreover, when the three-phase voltage triggers the voltage protection, the communication backpack can transmit a tripping signal to the circuit breaker, so that the circuit breaker completes tripping. Therefore, the communication knapsack can realize the function of voltage protection, so that the communication knapsack has the function of voltage protection, and the safety risk of the electric equipment of the circuit breaker is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of electrical protection equipment, and in particular to a communication backpack and a circuit breaker. Background Art

[0002] As an external accessory for traditional circuit breakers, especially electronic molded case circuit breakers, the communication backpack connects to the circuit breaker to transmit information. By monitoring and controlling the circuit breaker's operation in real time, the communication backpack enables functions such as status monitoring, remote control, and fault diagnosis. Electronic molded case circuit breakers only have current protection capabilities, not voltage protection.

[0003] Currently, communication backpacks are powered by voltage. However, the communication backpacks in related art do not have a voltage protection function, resulting in safety risks for electrical equipment in circuit breakers. Utility Model Content

[0004] The present application provides a communication backpack and a circuit breaker with a voltage protection function, which can avoid safety risks in electrical equipment.

[0005] In a first aspect, the present application provides a communication backpack, which is applied to a circuit breaker; the input end of the communication backpack is used to obtain a three-phase voltage from the circuit breaker, and the output end of the communication backpack is used to output a trip signal, and the trip signal is used to control the circuit breaker to complete tripping;

[0006] The communication backpack is used to determine whether the three-phase voltage triggers voltage protection according to whether the three-phase voltage meets a preset condition, and transmit the trip signal to the circuit breaker when the three-phase voltage triggers the voltage protection.

[0007] The communication backpack provided in the first aspect can determine whether the three-phase voltage triggers voltage protection based on whether it meets preset conditions. Furthermore, when the three-phase voltage triggers voltage protection, the communication backpack can transmit a trip signal to the circuit breaker, causing it to trip. This allows the communication backpack to implement voltage protection, providing it with voltage protection capabilities and preventing safety risks to electrical equipment connected to the circuit breaker.

[0008] In a possible design, when the first voltage domain in which the communication backpack is located and the second voltage domain in which the circuit breaker is located are the same voltage domain, the communication backpack includes: a power supply module and a microprocessor module;

[0009] The first input end of the power supply module is used to obtain the three-phase voltage, the first output end of the power supply module is electrically connected to the input end of the microprocessor module, and the output end of the microprocessor module is used to output the trip signal;

[0010] The power supply module is used to step down the three-phase voltage to obtain the stepped-down three-phase voltage, and transmit the stepped-down three-phase voltage to the microprocessor module;

[0011] The microprocessor module is used to sample the stepped-down three-phase voltage to obtain a sampled voltage, and perform calculation processing on the sampled voltage to obtain a first voltage, where the first voltage is used to represent the current voltage of the three-phase voltage;

[0012] The microprocessor module is further configured to determine that the three-phase voltage triggers the voltage protection when the first voltage meets the preset condition, and transmit the trip signal to the circuit breaker.

[0013] In a possible design, when the first voltage domain in which the communication backpack is located is different from the second voltage domain in which the circuit breaker is located, the communication backpack includes: a power supply module, a microprocessor module, and a relay group;

[0014] The first input end of the power module is used to obtain the three-phase voltage, the first output end of the power module is electrically connected to the input end of the micro-processing module, the second output end of the power module is electrically connected to the power supply end of the micro-processing module, the output end of the micro-processing module is electrically connected to the input end of the relay group, and the output end of the relay group is used to output the trip signal;

[0015] The power supply module is used to step down the three-phase voltage to obtain the stepped-down three-phase voltage, and transmit the stepped-down three-phase voltage to the microprocessor module;

[0016] The microprocessor module is used to sample the stepped-down three-phase voltage to obtain a sampled voltage, and perform calculation processing on the sampled voltage to obtain a first voltage, where the first voltage is used to represent the current voltage of the three-phase voltage;

[0017] The microprocessor module is further configured to determine, when the first voltage meets the preset condition, whether the three-phase voltage triggers the voltage protection, and transmit an indication signal to the relay group, wherein the indication signal is used to indicate whether the circuit breaker has completed tripping;

[0018] The relay group is used to convert the indication signal from the first voltage domain to the second voltage domain, obtain the trip signal, and transmit the trip signal to the circuit breaker.

[0019] In one possible design, the second output terminal of the power supply module is electrically connected to the power supply terminal of the microprocessor module;

[0020] The power supply module is further configured to provide a power supply voltage to the microprocessor module based on the three-phase voltage, so that the microprocessor module determines whether the three-phase voltage triggers the voltage protection.

[0021] In one possible design, the second input terminal of the power module is used to receive an AC voltage;

[0022] The power supply module is further configured to provide the power supply voltage to the microprocessor module based on the AC voltage.

[0023] In a possible design, when the microprocessor module does not receive any operation instruction or communication information within a preset time period, it enters a sleep mode, so that the communication backpack enters the sleep mode.

[0024] In one possible design, the voltage protection includes: overvoltage protection, undervoltage protection, phase loss protection and voltage loss protection.

[0025] In a possible design, the preset condition includes: a first preset condition, a second preset condition, a third preset condition, and a fourth preset condition;

[0026] The first preset condition is that at least one phase of the three-phase voltage is greater than the overvoltage threshold and lasts for a first operating delay;

[0027] The second preset condition is that at least one phase of the three-phase voltage is less than the undervoltage threshold and lasts for the second working delay;

[0028] The third preset condition is that at most two phases of the three-phase voltage are less than the phase loss threshold and the third working delay lasts;

[0029] The fourth preset condition is that the three phases of the three-phase voltage are all less than the phase loss threshold and the third working delay lasts.

[0030] In one possible design, when the three-phase voltage meets the first preset condition, the voltage protection triggered by the three-phase voltage is the overvoltage protection;

[0031] When the three-phase voltage meets the second preset condition, the voltage protection triggered by the three-phase voltage is the undervoltage protection;

[0032] When the three-phase voltage meets the third preset condition, the voltage protection triggered by the three-phase voltage is the phase loss protection;

[0033] When the three-phase voltage meets the fourth preset condition, the voltage protection triggered by the three-phase voltage is the undervoltage protection.

[0034] In a second aspect, the present application provides a circuit breaker, comprising: the communication backpack in the above-mentioned first aspect and various possible designs of the above-mentioned first aspect.

[0035] The beneficial effects of the circuit breaker provided in the second aspect and each possible design of the second aspect can be referred to the beneficial effects brought about by the first aspect and each possible implementation method of the first aspect, and will not be repeated here.

[0036] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 A schematic structural diagram of a communication backpack provided in one embodiment of the present application.

[0039] Description of reference numerals:

[0040] 100. Communication backpack; 110. Power supply module; 120. Microprocessor module; 130. Relay group; 200. Circuit breaker. DETAILED DESCRIPTION

[0041] In this application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a alone, b alone, or c alone can represent: a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b, and c in combination, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0042] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present application.

[0043] The terms "connected" and "connect" should be interpreted broadly. For example, "connected" or "connected" in a circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is interconnected. It can also refer to internal connectivity between two components. Signal connection can refer not only to signal connection through circuits but also to signal connection through media, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application on a case-by-case basis.

[0044] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of a communication backpack provided in one embodiment of the present application. Figure 1 As shown, the input end of the communication backpack 100 is used to obtain the three-phase voltage from the circuit breaker 200, and the output end of the communication backpack 100 is used to output the trip signal D.

[0045] The trip signal D is used to control the circuit breaker 200 to complete tripping.

[0046] The three-phase voltage may include: phase A voltage, phase B voltage and phase C voltage. The three-phase voltage is provided by the main circuit of the circuit breaker.

[0047] The communication backpack 100 can determine whether the three-phase voltage triggers voltage protection based on whether it meets preset conditions. Furthermore, when the three-phase voltage triggers voltage protection, the communication backpack 100 transmits a trip signal D to the circuit breaker 200, causing it to trip. This enables the communication backpack 100 to implement voltage protection, providing it with voltage protection capabilities and preventing safety risks to electrical equipment connected to the circuit breaker 200.

[0048] Among them, protection parameters are stored in the communication backpack 100, and the protection parameters may include: overvoltage threshold, undervoltage threshold, phase loss threshold, first action delay, second action delay, third action delay, first return threshold, second return threshold, first return delay, second return delay and third return delay.

[0049] The first return threshold is the difference between the overvoltage threshold and the preset voltage. That is, the overvoltage threshold can fluctuate relative to the preset voltage. The second return threshold is the sum of the undervoltage threshold and the preset voltage. That is, the undervoltage threshold can fluctuate relative to the preset voltage. The preset voltage is, for example, 10V.

[0050] The overvoltage threshold is, for example, between 240V and 300V, the undervoltage threshold is, for example, between 150V and 200V, and the phase loss threshold is, for example, between 100V and 145V.

[0051] The first action delay and the second action delay are, for example, between 1 and 60 seconds, the third action delay is, for example, between 1 and 30 seconds, the first return delay and the second return delay are, for example, between 1 and 5 seconds, and the third return delay is, for example, 1 second.

[0052] The first return delay refers to the duration that the voltage of one of the three-phase voltages is less than the first return threshold. The second return delay refers to the duration that the voltage of one of the three-phase voltages is greater than the second return threshold. The third return delay refers to the duration that the voltage of one of the three-phase voltages is greater than the phase loss threshold.

[0053] Exemplarily, voltage protection may include: overvoltage protection, undervoltage protection, phase loss protection and voltage loss protection.

[0054] In some examples, the preset conditions may include: a first preset condition, a second preset condition, a third preset condition, and a fourth preset condition.

[0055] The first preset condition is that at least one phase of the three-phase voltage is greater than the overvoltage threshold and lasts for a first operation delay.

[0056] The second preset condition is that at least one phase of the three-phase voltage is less than the undervoltage threshold and lasts for the second operation delay.

[0057] The third preset condition is that at most two phases of the three-phase voltage are less than the phase loss threshold and continue for a third working delay.

[0058] The fourth preset condition is that the three phases of the three-phase voltage are all less than the phase loss threshold and continue for the third working delay.

[0059] In some examples, when the three-phase voltage meets a first preset condition, the voltage protection triggered by the three-phase voltage is overvoltage protection.

[0060] When the three-phase voltage meets the second preset condition, the voltage protection triggered by the three-phase voltage is undervoltage protection.

[0061] When the three-phase voltage meets the third preset condition, the voltage protection triggered by the three-phase voltage is phase loss protection.

[0062] When the three-phase voltage meets the fourth preset condition, the voltage protection triggered by the three-phase voltage is undervoltage protection.

[0063] For example, if the first action delay is 45s and the first return delay is 3s, and the overvoltage threshold is 240V, the first return threshold is 230V. When the phase A voltage fluctuates between 240V and 230V, or is greater than 240V, for 45 seconds, the voltage protection triggered by the phase A voltage is overvoltage protection. When the phase A voltage is less than 230V for 3 seconds, the phase A voltage exits overvoltage protection.

[0064] For another example, if the phase loss threshold is 100V, the third operating delay is 25s, and the third return delay is 1s, when the voltage on phase A is less than 100V for 24s, the voltage protection triggered by the voltage on phase A is phase loss protection. When the voltage on phase A is greater than 100V for 1s, the voltage on phase A has exited phase loss protection.

[0065] The communication backpack and circuit breaker provided in this application can determine whether the three-phase voltage triggers voltage protection based on whether it meets preset conditions. Furthermore, when the three-phase voltage triggers voltage protection, the communication backpack can transmit a trip signal to the circuit breaker, causing it to trip. This allows the communication backpack to implement voltage protection, providing it with voltage protection capabilities and preventing safety risks to the circuit breaker's electrical equipment.

[0066] Based on the description of the above embodiment, a possible implementation of the communication backpack 100 is exemplified. When the first voltage domain where the communication backpack 100 is located and the second voltage domain where the circuit breaker 200 is located are the same voltage domain, such as Figure 1 As shown, the communication backpack 100 may include: a power module 110 and a microprocessor module 120 .

[0067] The power supply module 110 and the microprocessor module 120 may be provided separately or integrated, and this embodiment of the present application does not specifically limit this.

[0068] The first input terminal of the power module 110 is used to obtain a three-phase voltage. The first output terminal of the power module 110 is electrically connected to the input terminal of the microprocessor module 120 . The output terminal of the microprocessor module 120 is used to output a trip signal D.

[0069] Among them, the microprocessor module 120 (microcontroller unit, MCU).

[0070] The power module 110 can step down the three-phase voltage to obtain the stepped-down three-phase voltage, and can transmit the stepped-down three-phase voltage to the microprocessor module 120 so that the microprocessor module 120 can obtain the stepped-down three-phase voltage.

[0071] The voltage reduction process may include: amplification process and filtering process.

[0072] In this way, the micro-processing module 120 can sample the stepped-down three-phase voltage to obtain a sampled voltage, and can also perform computation on the sampled voltage to obtain a first voltage.

[0073] The first voltage is used to represent the current voltage of the three-phase voltage.

[0074] Furthermore, when the first voltage meets a preset condition, the microprocessor module 120 can determine that the three-phase voltage triggers voltage protection. Furthermore, the microprocessor module 120 can transmit a trip signal D to the circuit breaker 200, causing the circuit breaker 200 to trip. Thus, the communication backpack 100 can implement a voltage protection function.

[0075] Based on the description of the above embodiment, a possible implementation of the communication backpack 100 is exemplified. When the first voltage domain where the communication backpack 100 is located is different from the second voltage domain where the circuit breaker 200 is located, such as Figure 1 As shown, the communication backpack 100 may include: a power module 110 , a microprocessor module 120 and a relay group 130 .

[0076] The first input end of the power supply module 110 is used to obtain a three-phase voltage, the first output end of the power supply module 110 is electrically connected to the input end of the microprocessor module 120, the second output end of the power supply module 110 is electrically connected to the power supply end of the microprocessor module 120, the output end of the microprocessor module 120 is electrically connected to the input end of the relay group 130, and the output end of the relay group 130 is used to output a trip signal D.

[0077] Among them, the power supply module 110, the microprocessor module 120 and the relay group 130 can be set separately or integrated, and the embodiment of the present application does not make specific limitations on this.

[0078] The power module 110 can step down the three-phase voltage to obtain the stepped-down three-phase voltage, and can transmit the stepped-down three-phase voltage to the microprocessor module 120 so that the microprocessor module 120 can obtain the stepped-down three-phase voltage.

[0079] In this way, the micro-processing module 120 can sample the stepped-down three-phase voltage to obtain a sampled voltage, and can also perform computation on the sampled voltage to obtain a first voltage.

[0080] The first voltage is used to represent the current voltage of the three-phase voltage.

[0081] Furthermore, when the first voltage meets the preset condition, the microprocessor module 120 can determine that the three-phase voltage triggers the voltage protection. In addition, the microprocessor module 120 can transmit the indication signal IO to the relay group 130 so that the relay group can obtain the indication signal IO.

[0082] The indication signal IO is used to indicate whether the circuit breaker 200 has completed tripping.

[0083] In this way, the relay group 130 can convert the indication signal IO from the first voltage domain to the second voltage domain, obtaining a trip signal D. Furthermore, the relay group 130 can transmit the trip signal D to the circuit breaker 200, causing the circuit breaker 200 to trip. Thus, the communication backpack 100 can implement a voltage protection function.

[0084] The level of the indication signal IO is consistent with the level of the trip signal D. When the indication signal IO is high, the trip signal D is high. When the indication signal IO is low, the trip signal D is low.

[0085] In some examples, the second output terminal of the power module 110 is electrically connected to the power terminal of the micro-processing module 120 .

[0086] The power module 110 can obtain the power voltage VCC1 based on the three-phase voltage. Furthermore, the power module 110 can provide the power voltage VCC1 to the microprocessor module 120 to enable the microprocessor module 120 to operate. Thus, the microprocessor module 120 can determine whether the three-phase voltage triggers the voltage protection.

[0087] For example, the power supply voltage VCC1 is 3.3V.

[0088] In some examples, the second input terminal of the power module 110 is used to receive an alternating current voltage AC.

[0089] The AC voltage is, for example, 220V, 230V, and 380V.

[0090] The power module 110 can obtain a power voltage VCC1 according to the alternating current voltage AC, and can provide the power voltage VCC1 to the microprocessor module 120 .

[0091] The power supply voltage VCC1 of the microprocessor module 120 can be provided by either a three-phase voltage, i.e., the main circuit of the circuit breaker, or an alternating current (AC). When only a three-phase voltage is connected, the power supply voltage VCC1 is provided by the three-phase voltage. When both a three-phase voltage and an AC voltage are connected, the power supply voltage VCC1 is provided by the AC voltage alone.

[0092] For example, when the micro-processing module 120 does not receive any operation instruction or communication information within a preset time period, the micro-processing module 120 enters the sleep mode. In this way, the communication backpack 100 enters the sleep mode, which reduces the power consumption of the communication backpack 100.

[0093] The operation instructions are output by the operation input device connected to the microprocessor module 120. The communication information is output by other modules connected to the microprocessor module 120 via wired transmission. The communication information may include communication information to the host computer and communication information to the circuit breaker 200.

[0094] The embodiment of the present application further provides a circuit breaker, which includes: the communication backpack 100 provided in the embodiment of the present application.

[0095] The circuit breaker may further include an electric operating mechanism electrically connected to the power module 110 .

[0096] The power module 110 can provide a second voltage VCC2 to the circuit breaker 100 to enable the circuit breaker 100 to operate. The second voltage VCC2 is, for example, 12V. The power module 110 can provide a third voltage VCC3 to the electric operating mechanism to enable the electric operating mechanism to operate. The third voltage VCC3 is, for example, 24V.

[0097] The microprocessor module 120 transmits protection parameters to the circuit breaker via the 485 serial port.

[0098] The microprocessor module 120 can transmit an instruction signal IO to the relay group 130 for instructing the electric operating mechanism to operate, so that the relay group 130 can transmit a control signal to the electric operating mechanism according to the instruction signal IO, so that the electric operating mechanism performs the operation.

[0099] The circuit breaker provided in the embodiment of the present application has the same beneficial effects as the communication backpack provided in the embodiment of the present application, which will not be repeated here.

[0100] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication backpack, characterized in that: The communication backpack is applied to a circuit breaker; the input end of the communication backpack is used to obtain a three-phase voltage from the circuit breaker, and the output end of the communication backpack is used to output a trip signal, and the trip signal is used to control the circuit breaker to complete tripping; The communication backpack is used to determine whether the three-phase voltage triggers voltage protection according to whether the three-phase voltage meets a preset condition, and transmit the trip signal to the circuit breaker when the three-phase voltage triggers the voltage protection.

2. The communication backpack according to claim 1, characterized in that: When the first voltage domain where the communication backpack is located and the second voltage domain where the circuit breaker is located are the same voltage domain, the communication backpack includes: a power supply module and a microprocessor module; The first input end of the power supply module is used to obtain the three-phase voltage, the first output end of the power supply module is electrically connected to the input end of the microprocessor module, and the output end of the microprocessor module is used to output the trip signal; The power supply module is used to step down the three-phase voltage to obtain the stepped-down three-phase voltage, and transmit the stepped-down three-phase voltage to the microprocessor module; The microprocessor module is used to sample the stepped-down three-phase voltage to obtain a sampled voltage, and perform calculation processing on the sampled voltage to obtain a first voltage, where the first voltage is used to represent the current voltage of the three-phase voltage; The microprocessor module is further configured to determine that the three-phase voltage triggers the voltage protection when the first voltage meets the preset condition, and transmit the trip signal to the circuit breaker.

3. The communication backpack according to claim 1, characterized in that: When the first voltage domain where the communication backpack is located is different from the second voltage domain where the circuit breaker is located, the communication backpack includes: a power supply module, a microprocessor module and a relay group; The first input end of the power module is used to obtain the three-phase voltage, the first output end of the power module is electrically connected to the input end of the micro-processing module, the second output end of the power module is electrically connected to the power supply end of the micro-processing module, the output end of the micro-processing module is electrically connected to the input end of the relay group, and the output end of the relay group is used to output the trip signal; The power supply module is used to step down the three-phase voltage to obtain the stepped-down three-phase voltage, and transmit the stepped-down three-phase voltage to the microprocessor module; The microprocessor module is used to sample the stepped-down three-phase voltage to obtain a sampled voltage, and perform calculation processing on the sampled voltage to obtain a first voltage, where the first voltage is used to represent the current voltage of the three-phase voltage; The microprocessor module is further configured to determine, when the first voltage meets the preset condition, whether the three-phase voltage triggers the voltage protection, and transmit an indication signal to the relay group, wherein the indication signal is used to indicate whether the circuit breaker has completed tripping; The relay group is used to convert the indication signal from the first voltage domain to the second voltage domain, obtain the trip signal, and transmit the trip signal to the circuit breaker.

4. The communication backpack according to claim 2 or 3, characterized in that: The second output terminal of the power supply module is electrically connected to the power supply terminal of the micro-processing module; The power supply module is further configured to provide a power supply voltage to the microprocessor module based on the three-phase voltage, so that the microprocessor module determines whether the three-phase voltage triggers the voltage protection.

5. The communication backpack according to claim 4, characterized in that: The second input terminal of the power supply module is used to receive an AC voltage; The power supply module is further configured to provide the power supply voltage to the microprocessor module based on the AC voltage.

6. The communication backpack according to claim 2 or 3, characterized in that: When the micro-processing module does not receive any operation instruction or communication information within a preset time period, it enters the sleep mode, so that the communication backpack enters the sleep mode.

7. The communication backpack according to any one of claims 1 to 3, characterized in that: The voltage protection includes: overvoltage protection, undervoltage protection, phase loss protection and voltage loss protection.

8. The communication backpack according to claim 7, characterized in that: The preset conditions include: a first preset condition, a second preset condition, a third preset condition and a fourth preset condition; The first preset condition is that at least one phase of the three-phase voltage is greater than the overvoltage threshold and lasts for a first operating delay; The second preset condition is that at least one phase of the three-phase voltage is less than the undervoltage threshold and lasts for a second working delay; The third preset condition is that at most two phases of the three-phase voltage are less than the phase loss threshold and the third working delay lasts; The fourth preset condition is that the three phases of the three-phase voltage are all less than the phase loss threshold and continue for the third working delay.

9. The communication backpack according to claim 8, characterized in that: When the three-phase voltage meets the first preset condition, the voltage protection triggered by the three-phase voltage is the overvoltage protection; When the three-phase voltage meets the second preset condition, the voltage protection triggered by the three-phase voltage is the undervoltage protection; When the three-phase voltage meets the third preset condition, the voltage protection triggered by the three-phase voltage is the phase loss protection; When the three-phase voltage meets the fourth preset condition, the voltage protection triggered by the three-phase voltage is the undervoltage protection.

10. A circuit breaker, characterized in that: include: A communication backpack as claimed in any one of claims 1 to 9.

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