Safe power distribution device

Abstract

The utility model discloses a safe power distribution device which collects first state data through an electric energy collection module, outputs a first power supply signal and a second power supply signal through a main control module, receives the first power supply signal through a relay module and outputs a first switch driving signal, and receives the second power supply signal and outputs a second switch driving signal. The power supply output module closes the first normally-open contact contactor group according to the first switch driving signal and keeps the second normally-open contact contactor group open according to the second switch driving signal so as to form an IT type power distribution circuit, or closes the second normally-open contact contactor group according to the second switch driving signal so as to form a TN type power distribution circuit. The technical problems that existing single TN-S and TN-C-S power distribution circuits are not high in safety and not suitable for use requirements of specific places or specific units are solved, and the purposes that an electronic system is used for controlling a power system, and different power distribution circuits are provided for the specific places or specific units are achieved.

Description

Technical Field

[0001] The present application relates to the field of electrical technology, and in particular to a safe power distribution device. Background Art

[0002] According to the relevant regulations of the electrical industry, low-voltage distribution circuits of 1kV and below are mainly divided into three categories according to the different protective grounding forms: TT method, TN method, and IT method. Among them, the TN method includes three derivative methods: TN-C, TN-CS, and TN-S.

[0003] The common feature of the TT method and the TN method is that the neutral point of the power supply end of the system is directly connected to the ground. However, the neutral point of the power supply end of the IT system is connected to the ground through a high resistance or not.

[0004] For many electrical equipment, when the outer shell is a conductive part, it is usually connected to the ground wire. When the TT and TN power distribution circuits have a fault such as the phase line touching the shell, a large short-circuit current will appear through the ground wire, causing instantaneous sparks and other phenomena. In serious cases, when the ground wire of some outer shells is broken, the outer shell will be charged, causing the risk of electric shock to people.

[0005] In the IT mode, since the neutral point is not connected to the ground or is connected with high resistance, when the first ground fault occurs, the fault current is very small. At the same time, if the human body touches the live shell, personal safety is guaranteed because the fault current is below the safe current range.

[0006] TN-S and TN-CS are the preferred distribution circuits for most scenarios due to their suitability, safety, and economy. However, in certain specific places or units, such as schools, laboratories, and data centers, where safety and power supply continuity are required, the above two methods cannot meet the needs.

[0007] The reason why TN-S and TN-CS power distribution circuits are not very safe is that the neutral point of the power distribution output is usually connected to the ground. Once a person accidentally touches a phase line of the power system, the body will form a loop with the power supply through the ground, causing electric shock. Although most modern power systems are currently equipped with leakage protectors to prevent this from happening, there is still a high risk of electric shock due to the fact that the leakage protectors have not been maintained for a long time, their performance has deteriorated, and their safety functions have not been tested regularly. At the same time, once the leakage protector works, the usual way is to disconnect the line connection, completely making the back-end circuit lose power supply, that is, the power supply is discontinuous. For some places that require that troubleshooting can be carried out by timely alarming when the first fault occurs, these two distribution circuits do not meet the requirements. Summary of the invention

[0008] The main purpose of this application is to provide a safe power distribution device, aiming to solve the technical problem that the existing single TN-S and TN-CS power distribution circuits are not safe and are not suitable for use in different places.

[0009] To achieve the above-mentioned purpose, the present application provides a safe power distribution device, including: an electric energy collection module, used to collect the bus power supply status; a main control module, connected to the electric energy collection module, the main control module is used to output a first power supply signal or a second power supply signal according to the input bus power supply status; a relay module, connected to the main control module, the relay module is used to receive the first power supply signal and output a first switch drive signal, or receive the second power supply signal and output a second switch drive signal; a power supply output module, having a first contactor group, a second contactor group and an isolation transformer, the first contactor group and the isolation transformer are connected in series to form a first Branch, the second contactor group is connected in parallel to the two ends of the first branch, the first branch is connected to the relay module and the second contactor is respectively connected to the relay module, the first contactor group and the second contactor group are in a mutually exclusive relationship, and both are connected to the relay module, the power supply output module is used to close the normally open contacts of the first contactor group according to the first switch drive signal and control the normally open contacts of the second contactor group to be in an open state according to the mutually exclusive relationship, or, close the normally open contacts of the second contactor group according to the second switch drive signal and control the normally open contacts of the first contactor group to be in an open state according to the mutually exclusive relationship.

[0010] Optionally, the electric energy collection module is used to collect the operating status of the isolation transformer; the first contactor group includes a first contactor and a second contactor, and the second contactor group includes a third contactor; the main control module is used to output a third power supply signal according to the input operating status of the isolation transformer; the relay module is also used to output a third switch drive signal according to the third power supply signal; the power supply output module is also used to keep the normally open contacts of the first contactor and the normally open contacts of the second contactor open, and keep the normally open contacts of the third contactor closed according to the third switch drive signal.

[0011] Optionally, the safe power distribution device also includes a safety protection module, which includes: a first circuit breaker, a first end of which is connected to the electric energy collection module; a surge suppressor, a first end of which is connected to the second end of the first circuit breaker, and the second end of the surge suppressor is grounded; a first leakage protector, a first end of which is connected to the second end of the first circuit breaker, and a second end of which is connected to the first end of the first contactor and the first end of the third contactor; a second circuit breaker, a first end of which is connected to the second end of the first contactor and the second end of the third contactor, and the second end of the second circuit breaker is connected to the electrical equipment.

[0012] Optionally, the main control module includes a third circuit breaker, a processor and a fourth circuit breaker; the processor is connected to the third circuit breaker and the fourth circuit breaker respectively, and the third circuit breaker is also connected to the second end of the first leakage protector, and the fourth circuit breaker is also connected to the relay module.

[0013] Optionally, the relay module includes: a first current relay, a first end of which is connected to the second end of the fourth circuit breaker, and a second end of which is connected to the normally closed contact of the third contactor; a second current relay, a first end of which is connected to the second end of the fourth circuit breaker, and a second end of which is connected to the normally closed contact of the first contactor; wherein the normally closed contact of the third contactor is also connected to the normally closed contact of the first contactor and the normally closed contact of the second contactor, and the normally closed contact of the first contactor is also connected to the normally closed contact of the second contactor.

[0014] Optionally, the safety distribution device also includes: a second leakage protector, a first end of which is connected to the normally closed contact of the first contactor, and a second end of which is connected to the normally closed contact of the second contactor and the normally closed contact of the third contactor; a third leakage protector, a first end of which is connected to the normally closed contact of the second contactor, and a second end of which is connected to the normally closed contact of the third contactor.

[0015] Optionally, the safety power distribution device also includes: a fifth circuit breaker, a first end of which is connected to the second end of the first leakage protector, and a second end of which is connected to the first end of the first current relay; a sixth circuit breaker, a first end of which is connected to the second end of the first leakage protector, and a second end of which is connected to the first end of the normally closed contact of the first contactor.

[0016] Optionally, the electric energy collection module includes: an electric energy meter, a first end of which is connected to the busbar, and a second end of which is connected to the first circuit breaker; and a voltmeter, which is connected in parallel at both ends of the isolation transformer.

[0017] Optionally, when the normally open contact of the first contactor group is closed and the normally open contact of the second contactor group is opened, the first contactor group and the isolation transformer constitute an IT type distribution circuit; the safety distribution device also includes: an insulation monitor connected to the processor, the insulation monitor is used to measure the insulation resistance of the IT type distribution circuit; a temperature transmitter connected to the processor, the temperature transmitter is used to monitor the temperature of each winding of the isolation transformer; a current monitor, connected to the processor, the current monitor is used to monitor the residual current at the output end of the isolation transformer.

[0018] Optionally, the safety power distribution device further includes: an emergency stop switch connected to the first circuit breaker, the emergency stop switch being used to control the first circuit breaker to cut off power to the output current of the bus circuit.

[0019] This exemplary embodiment provides a safe power distribution device, which collects the bus power supply status through the power collection module, the main control module outputs the first power supply signal or the second power supply signal according to the collected abnormal first state data, the relay module receives the first power supply signal and outputs the first switch drive signal, or receives the second power supply signal and outputs the second switch drive signal, the power supply output module closes the normally open contacts of the first contactor group according to the first switch drive signal and controls the normally open contacts of the second contactor group to be in an open state according to the mutually exclusive relationship, thereby forming an IT type distribution circuit, or the second switch drive signal closes the normally open contacts of the second contactor group and controls the normally open contacts of the first contactor group to be in an open state according to the mutually exclusive relationship, thereby forming a TN type distribution circuit. The embodiments of the present application solve the technical problem that the current single TN-S and TN-CS distribution circuits are not safe and are not suitable for the use requirements of specific places or specific units, and realizes the purpose of using electronic systems to control power systems and provide different distribution circuits to specific places or specific units. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An electrical schematic diagram of a safe power distribution device provided in one embodiment of the present application;

[0021] Figure 2 A structural block diagram of a safe power distribution device provided in one embodiment of the present application;

[0022] Figure 3 A diagram of the connection relationship between a processor and peripheral devices provided in one embodiment of the present application.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] Figure 1 The electrical schematic diagram of the safety power distribution device provided in one embodiment of the present application is as follows: Figure 2 This is a schematic diagram of a safety power distribution device according to an embodiment of the present application. Figure 1 and Figure 2The safe power distribution device may include an electric energy collection module 1 , a main control module 2 , a relay module 3 and a power supply output module 4 . Among them, the power collection module 1 is used to collect the bus power supply status, the main control module 2 is connected to the power collection module 1, and the main control module 2 is used to output the first power supply signal and the second power supply signal according to the input bus power supply status; the relay module 3 is connected to the main control module 2, and the relay module 3 is used to receive the first power supply signal and output the first switch drive signal, and receive the second power supply signal and output the second switch drive signal; the power supply output module 4 has a first contactor group, a second contactor group and an isolation transformer X, the first contactor group and the isolation transformer X are connected in series to form a first branch, the second contactor group is connected in parallel to the two ends of the first branch, the first branch connects the relay module and the second contactor group are connected to the relay module respectively, the first contactor group and the second contactor group are in a mutually exclusive relationship, and are both connected to the relay module 3, the power supply output module 4 is used to close the normally open contact of the first contactor group according to the first switch drive signal and control the normally open contact of the second contactor group to be in an open state according to the mutually exclusive relationship, or, close the normally open contact of the second contactor group according to the second switch drive signal and control the normally open contact of the first contactor group to be in an open state according to the mutually exclusive relationship.

[0026] Among them, the data collected by the power collection module 1 may include voltage, current, power, and electric energy. The power supply output module 4 has a first contactor group, and the first contactor group includes a first contactor KM1 and a second contactor KM2. The second contactor group includes a third contactor KM3. The first contactor KM1 and the second contactor KM2 are connected in series with the isolation transformer X, and the third contactor KM3 is connected in parallel with the first contactor KM1, the second contactor KM2 and the isolation transformer X connected in series, and the first contactor KM1 and the second contactor KM2 are respectively connected to the two ends of the relay module 3. When the data collected by the power collection module 1 are normal, the power collection module 1 reports the normal bus power supply state to the main control module 2, the main control module 2 outputs the first power supply state signal and sends it to the relay module 3, the relay module 3 outputs the first switch drive signal according to the first power supply state signal and sends it to the power supply output module 4, the power supply output module 4 controls the first contactor group to close, and according to the mutually exclusive relationship, the second contactor group is opened at this time, and the power supply output module 4 is an IT power distribution circuit. When there is any abnormality in the data collected by the electric energy acquisition module, the abnormal data is reported to the main control module 2, and the main control module 2 outputs the second power supply signal for controlling the relay module 3. After the relay module 3 receives the second power supply signal, it sends it to the power supply output module 4. The power supply output module 4 receives the second power supply signal and outputs the second switch drive signal to the power supply output module 4. When the power supply output module 4 receives the second switch drive signal, it controls the normally open contact of the second contactor group to close according to the second switch drive signal. According to the mutually exclusive relationship, the first contactor group is closed. At this time, the power supply output module is a TN type power distribution circuit. It should be noted that the mutually exclusive relationship is determined according to the wiring relationship between the first contactor group and the second contactor group. When the normally open contact of the second contactor group is opened, the normally open contact of the first contactor group is closed. In addition, for the same contactor, when the normally open contact is opened, the normally closed contact is closed. This is a characteristic of the contactor and will not be repeated here.

[0027] The present application improves the safety distribution device through the above exemplary embodiments, collects the bus power supply status through the power collection module 1, the main control module 2 outputs the first power supply signal or the second power supply signal according to the collected abnormal first state data, the relay module 3 receives the first power supply signal and outputs the first switch drive signal, or receives the second power supply signal and outputs the second switch drive signal, the power supply output module 4 closes the normally open contacts of the first contactor group according to the first switch drive signal and controls the normally open contacts of the second contactor group to be in an open state according to the mutually exclusive relationship, thereby forming an IT type distribution circuit, or the second switch drive signal closes the normally open contacts of the second contactor group and controls the normally open contacts of the first contactor group to be in an open state according to the mutually exclusive relationship, thereby forming a TN type distribution circuit. The embodiments of the present application solve the technical problems that the current single TN-S and TN-CS distribution circuits are not safe and are not suitable for the use requirements of specific places or specific units, and realize the purpose of using electronic systems to control power systems and provide different distribution circuits to specific places or specific units.

[0028] In this embodiment, reference Figure 1 The first contactor group includes a first contactor KM1 and a second contactor KM2, and the second contactor group includes a third contactor KM3; the main control module 2 is also used to output a third power supply signal according to the input first state data; the relay module 3 is also used to output a third switch drive signal according to the third power supply signal; the power supply output module 4 is also used to keep the normally open contacts of the first contactor KM1, the normally open contacts of the second contactor KM2, and the normally open contacts of the third contactor KM3 open according to the third switch drive signal.

[0029] Among them, the main control module 2 will output the third power supply signal when the transformer fails. When the power collection module receives the third power supply signal, it drives the relay module 3 to output the third switch drive signal to the power supply output module 4. After receiving the third switch drive signal, the power supply output module 4 controls the normally open contact of the first contactor KM1 and the normally open contact of the second contactor KM2 to remain open. According to the mutually exclusive relationship, at this time, the normally open contact of the third contactor KM3 is closed, so that the isolation transformer X can be safely removed for maintenance, and the load can also be powered normally through the TN-S and TN-CS distribution circuits.

[0030] In this embodiment, Figure 2 The electrical schematic diagram of the safety power distribution device provided in one embodiment of the present application is shown in FIG. Figure 2, the safety power distribution device may include a safety protection module, and the safety protection module may include a first circuit breaker QF1, a surge suppressor SPD, a first leakage protector Y1 and a second circuit breaker QF2. Among them, the first end of the first circuit breaker QF1 is connected to the power collection module; the first end of the surge suppressor SPD is connected to the second end of the first circuit breaker QF1, and the second end of the surge suppressor SPD is grounded; the first end of the first leakage protector Y1 is connected to the second end of the first circuit breaker QF1, and the second end of the first leakage protector Y1 is connected to the first end of the first contactor KM1 group and the second contactor KM2 group. The first end of the second circuit breaker QF2 is connected to the second end of the first contactor KM1 group and the second contactor KM2 group, and the second end of the second circuit breaker QF2 is connected to the electrical equipment.

[0031] Among them, the current flowing out of the busbar of the power line flows in the order of the power collection module, the first circuit breaker QF1, the surge suppressor SPD, the first leakage protector Y1, the first contactor KM1 group, the isolation transformer X and the second circuit breaker QF2. Among them, the first circuit breaker QF1 can realize the circuit breaking of the load on the busbar side, thereby realizing the role of power off at the source. The surge suppressor SPD is used for lightning protection of the device itself and the back-end electrical appliances. The first leakage protector Y1 is used to achieve leakage protection. Specifically, the first leakage protector Y1 is a fuse. The isolation transformer X is used for the direct insulation of the power supply and the load, and can also suppress the high-frequency return signal of the load. The first circuit breaker QF1 and the second circuit breaker QF2 are both molded case circuit breakers, and the molded case circuit breakers are equipped with a separation release. Among them, the molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting. The molded case refers to the use of a plastic insulator as the outer shell of the device to isolate the conductors and the grounded metal parts. Molded case circuit breakers usually contain thermal magnetic tripping units, while large-sized molded case circuit breakers are equipped with solid-state tripping sensors. The tripping units in the embodiments of the present application are divided into: electronic tripping units. When a circuit fails and the circuit to the load needs to be cut off, the first circuit breaker QF1 or the second circuit breaker QF2 can be closed, or the fuse can be blown, so that the safe transmission of current can be achieved.

[0032] In this embodiment, continue to refer to Figure 1 The main control module 2 includes a third circuit breaker QF3, a processor CPU and a fourth circuit breaker QF4. The processor CPU is connected to the third circuit breaker QF3 and the fourth circuit breaker QF4 respectively, and the third circuit breaker QF3 is also connected to the second end of the first leakage protector Y1, and the fourth circuit breaker QF4 is also connected to the relay module.

[0033] The third circuit breaker is connected to the first leakage protector Y1 to supply power to the processor CPU, and the output end of the processor CPU is connected to the relay module through the fourth circuit breaker QF4. The purpose of setting a circuit breaker at both ends of the processor CPU is to cut off the third circuit breaker QF3 and the fourth circuit breaker QF4 from the circuit when the processor CPU fails, so as to conveniently remove the processor CPU and facilitate the handling of the processor CPU failure.

[0034] In this embodiment, continue to refer to Figure 1 , the relay module 3 may also include a first current relay KA1 and a second current relay KA2. The first end of the first current relay KA1 is connected to the second end of the fourth circuit breaker QF4, and the second end is connected to the normally closed contact of the third contactor KM3; the first end of the second current relay KA2 is connected to the second end of the fourth circuit breaker QF4, and the second end is connected to the normally closed contact of the first contactor KM1; wherein the normally closed contact of the third contactor KM3 is also connected to the normally closed contact of the first contactor KM1 and the normally closed contact of the second contactor KM2, and the normally closed contact of the first contactor KM1 is also connected to the normally closed contact of the second contactor KM2.

[0035] Among them, when the first current relay KA1 receives the first power supply signal, it outputs the first switch drive signal. Under the drive of the first switch drive signal, the power supply output module 4 is an IT type distribution circuit. The IT type distribution circuit can be used for power supply in special places, such as schools, laboratories, hospitals, etc. It should be noted that the first power supply signal is used to characterize a normal power supply signal. The first current relay KA1 is also used to output the second switch drive signal according to the second power supply signal sent by the processor CPU. Under the drive of the second switch drive signal, the power supply output module 4 is a TN type distribution circuit. The TN type distribution circuit can be used for power supply in most occasions. It should be noted that the second power supply signal is used to characterize an abnormal power supply signal. The first current relay KA1 is also used to receive a third power supply signal and output a third switch drive signal. Under the drive of the third switch drive signal, the power supply output module 4 is used to constitute a TN type distribution circuit, and the TN type distribution circuit can be used for transformer maintenance. It should also be noted that the third power supply signal is used to characterize a transformer fault signal.

[0036] In this embodiment, continue to refer to Figure 1 , the safety power distribution device may include a second leakage protector Y2 and a third leakage protector Y3. The first end of the second leakage protector Y2 is connected to the second end of the normally closed contact of the first contactor KM1, and the second end is connected to the normally closed contact of the second contactor KM2 and the first end of the normally closed contact of the third contactor KM3; the first end of the third leakage protector Y3 is connected to the first end of the normally closed contact of the second contactor KM2, and the second end is connected to the first end of the normally closed contact of the third contactor KM3.

[0037] The second leakage protector Y2 and the third leakage protector Y3 can both be fuses. The second leakage protector Y2 can be used for leakage protection of the first current relay KA1, and the third leakage protector Y3 can be used for leakage protection of the second current relay KA2.

[0038] In this embodiment, the safety power distribution device may further include a fifth circuit breaker QF5 and a sixth circuit breaker QF6. The first end of the fifth circuit breaker QF5 is connected to the second end of the first leakage protector Y1, and the second end of the fifth circuit breaker QF5 is connected to the first end of the first current relay KA1; the first end of the sixth circuit breaker QF6 is connected to the second end of the first leakage protector Y1, and the second end of the sixth circuit breaker QF6 is connected to the first end of the normally closed contact of the first contactor KM1.

[0039] Among them, the fifth circuit breaker QF5 and the sixth circuit breaker QF6 are used to manually control the first contactor KM1, the second contactor KM2 and the third contactor KM3 when the main control module 2 fails. When the third circuit breaker QF3 and the fourth circuit breaker QF4 at both ends of the main control module 2 fail, the fifth circuit breaker QF5 can be used to control the first current relay KA1, and the first contactor KM1 and the second contactor KM2 are controlled by the first current relay KA1. Exemplarily, when the fifth circuit breaker QF5 controls the first current relay KA1 to keep the normally closed contact of the third contactor KM3 closed, at this time, the normally closed contacts of the first contactor KM1 and the second contactor KM2 are opened, at this time, the normally open contact of the third contactor KM3 is opened, and the normally open contacts of the first contactor KM1 and the second contactor KM2 are closed, so that the IT power distribution circuit is realized. When the fifth circuit breaker QF5 controls the first current relay KA1 so that the normally closed contact of the third contactor KM3 is opened, at this time, according to the mutually exclusive relationship, the normally closed contacts of the first contactor KM1 and the second contactor KM2 are closed, so that the normally open contact of the third contactor KM3 is closed, and the normally open contacts of the first contactor KM1 and the second contactor KM2 are opened, thereby forming a TN power distribution circuit. Similarly, the sixth circuit breaker QF6 can also control the output mode of the mode output selection module alone. It should be noted that when the main control module 2 fails, usually only one of the fifth circuit breaker QF5 and the sixth circuit breaker QF6 can work, that is, when the fifth circuit breaker QF5 works, the sixth circuit breaker QF6 does not work, and when the sixth circuit breaker QF6 works, the fifth circuit breaker QF5 does not work. The fifth circuit breaker QF5 and the sixth circuit breaker QF6 provide a manual control mode.

[0040] In this embodiment, continue to refer to Figure 1The electric energy collection module 1 includes an electric energy meter 5 and a voltmeter. The first end of the electric energy meter is connected to the busbar, and the second end is connected to the first circuit breaker; the voltmeter is connected in parallel to the two ends of the isolation transformer.

[0041] Among them, the electric energy acquisition module 1 can also be an ammeter, a voltmeter, etc. When the electric energy acquisition module 1 obtains abnormal voltage, current, electric energy or power, it will output an alarm signal, which are collectively referred to as the second power supply signal; if the voltage, current, electric energy or power is abnormal, it will output the first power supply signal; if the electric energy acquisition module 1 collects abnormal transformer voltage, it will output the third power supply signal. It should be noted that the electric energy meter 5 and the voltmeter are connected to the processor CPU via the RS485 bus respectively.

[0042] In this embodiment, Figure 3 A diagram showing the connection relationship between a processor CPU and peripheral devices provided in an embodiment of the present application, see Figure 3 The safety power distribution device may include an insulation monitor 6, a temperature transmitter 7 and a current monitor 8. The insulation monitor 6 is connected to the processor CPU and is used to measure the insulation resistance of the IT power distribution circuit; the temperature transmitter 7 is connected to the processor CPU and is used to monitor the temperature of each winding of the isolation transformer X; the current monitor 8 is connected to the processor CPU and is used to monitor the residual current at the output end of the isolation transformer X.

[0043] Among them, the indicator light 9 is used to indicate the working state of the system, indicating which mode the current power supply mode is. The axial fan 10 is used to dissipate heat inside the device to meet the uninterrupted working conditions of the device. The temperature transmitter 7 is used to measure the temperature of each winding of the isolation transformer X. The temperature transmitter 7 achieves the purpose of temperature monitoring by exchanging data with the electronic system main control module 2. The current monitor 8 is used to monitor the residual current at the output end of the isolation transformer X. The insulation monitor 6 is used to measure the insulation resistance of the IT distribution circuit. The processor CPU is also equipped with a high-definition color display and various communication interfaces. At the same time, the processor CPU has the ability of 4G network transmission. Through the screen display, various information of the entire device can be displayed. At the same time, the processor CPU also has a local configuration function. The network transmission capability of the processor CPU allows the device to upload data to a designated platform in real time as an Internet of Things device to achieve effective supervision and control of the power system.

[0044] In this embodiment, continue to refer to Figure 3 The safety power distribution device includes an emergency stop switch. The emergency stop switch is connected to the first circuit breaker QF1 and is used to control the electronic trip of the first circuit breaker QF1 to separate, thereby cutting off the output current of the bus circuit. The emergency stop switch is used to shut down the power supply of the entire device in an emergency, eliminating the impact of the device on the rear-end load system in an emergency.

[0045] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A safe power distribution device, characterized in that: include: Electric energy collection module, used to collect bus power supply status; A main control module, connected to the electric energy collection module, and configured to output a first power supply signal or a second power supply signal according to an input bus power supply state; a relay module connected to the main control module, the relay module being used to receive the first power supply signal and output a first switch drive signal, or to receive the second power supply signal and output a second switch drive signal; A power supply output module comprises a first contactor group, a second contactor group and an isolation transformer, wherein the first contactor group and the isolation transformer are connected in series to form a first branch, the second contactor group is connected in parallel to both ends of the first branch, the first branch is connected to a relay module and the second contactor is connected to relay modules respectively, the first contactor group and the second contactor group are in a mutually exclusive relationship and are both connected to the relay module, the power supply output module is used to close the normally open contacts of the first contactor group according to the first switch drive signal and control the normally open contacts of the second contactor group to be in an open state according to the mutually exclusive relationship, or to close the normally open contacts of the second contactor group according to the second switch drive signal and control the normally open contacts of the first contactor group to be in an open state according to the mutually exclusive relationship.

2. A safe power distribution device as claimed in claim 1, characterized in that: The electric energy collection module is used to collect the operating status of the isolation transformer; The first contactor group includes a first contactor and a second contactor, and the second contactor group includes a third contactor; The main control module is used to output a third power supply signal according to the input operation status of the isolation transformer; The relay module is further configured to output a third switch driving signal according to the third power supply signal; The power supply output module is further used to keep the normally open contact of the first contactor and the normally open contact of the second contactor open, and keep the normally open contact of the third contactor closed according to the third switch driving signal.

3. A safe power distribution device as claimed in claim 2, characterized in that: The safety power distribution device further includes a safety protection module, which includes: A first circuit breaker, a first end of which is connected to the electric energy collection module; a surge suppressor, a first end of which is connected to the second end of the first circuit breaker, and a second end of the surge suppressor is grounded; A first leakage protector, a first end of which is connected to the second end of the first circuit breaker, and a second end of which is connected to the first end of the first contactor and the first end of the third contactor; The second circuit breaker has a first end connected to the second end of the first contactor and the second end of the third contactor, and a second end of the second circuit breaker is connected to an electrical device.

4. A safe power distribution device as claimed in claim 3, characterized in that: The main control module includes a third circuit breaker, a processor and a fourth circuit breaker; The processor is connected to the third circuit breaker and the fourth circuit breaker respectively, and the third circuit breaker is also connected to the second end of the first leakage protector, and the fourth circuit breaker is also connected to the relay module.

5. A safe power distribution device as claimed in claim 4, characterized in that: The relay module comprises: a first current relay, a first end of which is connected to the second end of the fourth circuit breaker, and a second end of which is connected to the normally closed contact of the third contactor; a second current relay, a first end of which is connected to the second end of the fourth circuit breaker, and a second end of which is connected to the normally closed contact of the first contactor; The normally closed contact of the third contactor is also connected to the normally closed contact of the first contactor and the normally closed contact of the second contactor, and the normally closed contact of the first contactor is also connected to the normally closed contact of the second contactor.

6. A safe power distribution device as claimed in claim 2, characterized in that: The safety power distribution device also includes: A second leakage protector, a first end of which is connected to a normally closed contact of the first contactor, and a second end of which is connected to a normally closed contact of the second contactor and a normally closed contact of the third contactor; The third leakage protector has a first end connected to the normally closed contact of the second contactor, and a second end connected to the normally closed contact of the third contactor.

7. A safe power distribution device as claimed in claim 5, characterized in that: The safety power distribution device also includes: a fifth circuit breaker, a first end of which is connected to the second end of the first leakage protector, and a second end of which is connected to the first end of the first current relay; A sixth circuit breaker has a first end connected to the second end of the first leakage protector, and a second end connected to the first end of the normally closed contact of the first contactor.

8. A safe power distribution device as claimed in claim 3, characterized in that: The electric energy collection module comprises: An electric energy meter, a first end of which is connected to the busbar, and a second end of which is connected to the first circuit breaker; A voltmeter is placed in parallel at both ends of the isolation transformer.

9. A safe power distribution device as claimed in claim 4, characterized in that: When the normally open contact of the first contactor group is closed and the normally open contact of the second contactor group is opened, the first contactor group and the isolation transformer constitute an IT type power distribution circuit; the safety power distribution device also includes: an insulation monitor connected to the processor, the insulation monitor being used to measure the insulation resistance of the IT type power distribution circuit; A temperature transmitter connected to the processor, the temperature transmitter is used to monitor the temperature of each winding of the isolation transformer; A current monitor is connected to the processor, and is used to monitor the residual current at the output end of the isolation transformer.

10. A safe power distribution device as claimed in claim 3, characterized in that: The safety power distribution device also includes: An emergency stop switch is connected to the first circuit breaker, and the emergency stop switch is used to control the first circuit breaker to cut off the circuit output current of the busbar.

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