Intelligent multi-pulse rectification direct current remote power supply system for tunnel illumination

Abstract

An intelligent multi-pulse-wave rectification direct-current remote power supply system for tunnel illumination is composed of a multi-pulse-wave rectification power supply cabinet, an illumination subsystem and a background word system. The multi-pulse rectification power supply cabinet is composed of an alternating current air switch, a three-phase lightning protection device, a current transformer, a multifunctional electric energy meter, a multi-pulse rectification transformer, a transformer temperature acquisition module, an alternating current side RC overvoltage suppression module, a direct current side RC overvoltage suppression module, a rectification module, a direct current lightning protection device, a direct current bus, a direct current circuit breaker, a power supply module, an intelligent controller and a dimming controller. The cabinet is composed of a touch screen, a fan, a cabinet door travel switch, a temperature and humidity sensor, an insulation monitoring module, a terminal strip, a wire and a cabinet body. The lighting subsystem is composed of a lamp, a dimming module and a DC / DC power supply. The background word system is composed of a transmission network, a switch and a work station. According to the utility model, the overload capacity of the whole system can be improved, the working efficiency and reliability are higher, and effective technical support is provided for safe and effective power supply of tunnel lighting.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel lighting power supply related equipment, in particular to an intelligent multi-pulse rectified DC remote power supply system for tunnel lighting. Background Art

[0002] With the large-scale construction of highways, railways and subways in my country, the number of tunnels is increasing year by year, and the demand for tunnel lighting is also increasing. Tunnel lighting is a key factor in ensuring the safety and normal operation of tunnels. In the existing technology, the tunnel lighting power supply solution is not specifically designed in combination with the characteristics of tunnel lighting itself, resulting in a series of problems such as large power loss, high construction cost, high failure rate, high maintenance cost in the later stage and low intelligence. Therefore, a new power supply solution is urgently needed to fundamentally solve the existing problems. Combined with the characteristics of tunnel lighting itself, such as dispersed electrical equipment, small load and large power supply radius, it is particularly important to provide a safe and reliable tunnel lighting power supply solution. Summary of the invention

[0003] In order to overcome the disadvantages of the existing tunnel lighting power supply due to technical limitations as described in the background, the utility model provides a system that, under the joint action of relevant mechanisms,

[0004] It has the advantages of small energy loss, longer power supply radius, saving engineering construction investment, reducing the risk of electric shock due to leakage, and stronger environmental adaptability. At the same time, it can improve the overload capacity of the entire system, extend the service life of the transformer, and have higher working efficiency and reliability. The high reliability and maintenance workload increase the dimming function, realize the integrated design of power supply and lighting, and provide effective technical support for the safe and effective power supply of tunnel lighting. It is an intelligent multi-pulse rectifier DC remote power supply system for tunnel lighting.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An intelligent multi-pulse rectifier DC remote power supply system for tunnel lighting, characterized in that it includes a multi-pulse rectifier power supply cabinet, a lighting subsystem and a background subsystem. The multi-pulse rectifier power supply cabinet converts the input AC 380V into DC 400V for long-distance transmission to power tunnel lamps, and integrates a dimming controller; the multi-pulse rectifier power supply cabinet is composed of an AC circuit breaker, a three-phase lightning arrester, a current transformer, a multi-function electric energy meter, a multi-pulse rectifier transformer, a transformer temperature acquisition module, an AC side RC overvoltage suppression module, a DC side RC overvoltage suppression module, and a rectifier module. , DC lightning arrester, DC bus, DC circuit breaker, power module, intelligent controller, dimming controller, touch screen, fan, cabinet door travel switch, temperature and humidity sensor, insulation monitoring module, terminal block, wire, cabinet body; the lighting subsystem is composed of lamps, dimming modules and DC / DC power supply; the background subsystem is composed of transmission network, switch and workstation; the power output end of the multi-pulse rectifier power cabinet is electrically connected to the power input end of the lighting subsystem, the power output end of the lighting subsystem is electrically connected to the lamp, and the signal output end of the background subsystem is electrically connected to the signal input end of the lighting subsystem.

[0007] Furthermore, the AC circuit breaker input end is connected to an external low-voltage feeder cabinet to obtain electrical energy for the protection of the rear-end power supply circuit. When a short circuit or overload occurs in the rear-end power supply circuit, the protection trip is initiated. At the same time, a locking relationship is formed with the cabinet door travel switch to ensure that the cabinet door cannot be opened when the AC circuit is energized; a three-phase lightning arrester is connected to the AC circuit breaker output end for lightning protection of three-phase input AC power; a current transformer is fixed on the wire at the AC circuit breaker output end for collecting the input three-phase AC current and converting the collected large primary current into a small secondary current for collection by the multi-function electric energy meter.

[0008] Furthermore, the multifunctional electric energy meter has a current input terminal connected to the secondary side output terminal of the current transformer, and a voltage input terminal connected to the output terminal of the AC circuit breaker, which is used for electric energy metering, electric quantity measurement and local display, and is equipped with an RS485 communication function to transmit information to the intelligent controller; a multi-pulse rectifier transformer, whose primary side is connected to the output terminal of the AC circuit breaker, and whose secondary side is connected to the input terminal of the rectifier module, is used to convert the input AC 380V into the AC input required by the rectifier module, wherein the output of the 6-pulse rectifier transformer is one winding, the output of the 12-pulse rectifier transformer is two windings, and the output of the 18-pulse rectifier transformer is three windings, and the iron core structure type of the multi-pulse rectifier transformer can be a wound iron core or a stacked iron core type.

[0009] Furthermore, the transformer temperature acquisition module is composed of a temperature acquisition sensor and a host. The temperature acquisition sensor is installed at each phase winding and core of the transformer. The host is fixed on the cabinet and is used to collect the temperature of each phase winding and core of the transformer, monitor the winding and core temperature in real time, ensure that an alarm is triggered when the temperature reaches the alarm threshold, and trip at the trip threshold, and output the alarm or trip signal through a hard contact and upload it to the intelligent controller; the AC side RC overvoltage suppression module adopts a triangle connection and is connected to the output end of the multi-pulse rectifier transformer to prevent overvoltage caused by AC input switch operation or transformer induction.

[0010] Furthermore, the DC side RC overvoltage suppression module is connected in parallel to the positive and negative output electrodes of the rectifier module to prevent the operating overvoltage generated when the DC circuit breaker is opened and closed from damaging the diode and suppressing the residual overvoltage; the input end of the rectifier module is connected to the output end of the multi-pulse rectifier transformer, and the output end is connected to the DC bus. The diode rectification technology is used to rectify the AC power output by the multi-pulse rectifier transformer into 400V DC power, wherein the 6-pulse rectifier transformer adopts one rectifier module, the 12-pulse rectifier transformer adopts two rectifier modules, and the 18-pulse rectifier transformer adopts three rectifier modules. Each branch of the rectifier module adopts a redundant design of two diodes in parallel to ensure that the normal power supply is not affected when one of the diodes on the same branch fails. Each diode is connected in series with a fast fuse with a contact to protect the short-circuit current generated by the diode losing its unidirectional performance. After the fast fuse is blown, a fault alarm signal can be given through the corresponding contact and uploaded to the intelligent controller.

[0011] Furthermore, the DC lightning arrester input end is respectively connected to the positive and negative busbars, and is used for DC busbar lightning surge overvoltage protection; the DC circuit breaker, the input end is connected to the positive and negative busbars, and the output end is connected to the terminal block, which is used to trip when a short circuit or overload occurs in the DC circuit, protecting the lines and equipment from damage; the power module, the input end is connected to the output end of the AC circuit breaker, and the output end is connected to the corresponding electrical equipment, and is used to supply power to the components in the system, and is divided into a 24V power module and a 48V power module. The 24V power module provides power for the touch screen, cabinet door travel switch, temperature and humidity sensor and insulation monitoring module, and the 48V power module provides power for the fan.

[0012] Furthermore, the intelligent controller is the control core of the entire system, which is composed of a CPU unit, a memory unit, a communication unit, a power supply unit, a DI / DO unit, an AI / AO unit and corresponding software, and is used for collecting input signals, data processing, data storage, control and communication functions; the dimming controller is integrated in the cabinet and is used for dimming control of tunnel lighting fixtures. The dimming method is selected from one of PWM dimming, 0-5V dimming, 0-10V dimming, power line carrier and RS485 dimming.

[0013] Furthermore, the touch screen is used for local display, setting of various parameters and local control of dimming; the fan is installed on the top of the cabinet, and is used to measure parameters according to the temperature and humidity sensors in the cabinet, accelerate the circulation of air inside the cabinet, and reduce the temperature and humidity in the cabinet; the cabinet door travel switch is used to lock with the AC input circuit to ensure that the cabinet door cannot be opened when the AC power in the cabinet is not cut off, thereby ensuring the safety of personnel, and ensuring that the lighting fixtures are turned on after the cabinet door is opened after the cabinet power is cut off.

[0014] Furthermore, the temperature and humidity sensor is used to collect the temperature and humidity parameters in the cabinet in real time, and transmit the collected data to the intelligent controller in real time to control the operation of the fan; the insulation monitoring module is used to monitor the insulation resistance of the DC positive and negative busbars to the ground in real time, and transmit the measured data to the intelligent controller in real time to determine the insulation status of the positive and negative busbars; the lamp is installed on the tunnel wall to provide lighting for the tunnel; the dimming module is integrated in the lamp, and is used to receive the signal of the dimming controller to complete the dimming function of the lamp.

[0015] Furthermore, the DC / DC power supply is integrated in the lamp to convert the input DC 400V into the voltage required by the lamp to power the lamp; the transmission network is used to connect the workstation with the interface of the multi-pulse rectifier power supply cabinet to complete the transmission of communication information; the switch is installed in the control room to send the dimming information issued by the workstation and receive the equipment monitoring information in the multi-pulse rectifier power supply cabinet; the workstation is installed in the control room to complete the remote intelligent dimming of the tunnel and monitor and control the multi-pulse rectifier power supply cabinet.

[0016] Compared with the prior art, the utility model has the following beneficial effects: 1) The utility model adopts multi-pulse rectifier transformer and diode rectifier technology to rectify the input AC power into DC power for remote transmission, which can greatly save the investment in engineering construction. At the same time, it can reduce the power loss of the system, increase the power supply radius of the system, and eliminate the components of the traditional power supply scheme, with high reliability and small maintenance workload; 2) The multi-pulse rectifier transformer has high efficiency, strong environmental adaptability, and a certain overload capacity to meet the needs of later capacity expansion; 3) Temperature sensors are set on each phase winding and core of the multi-pulse rectifier transformer to ensure that the temperature rise of the rectifier transformer is controlled within the limit and the service life of the transformer is extended; 4) The DC-powered lamp driving power supply is DC / DC, which has higher working efficiency and reliability; 5) The system adds a dimming function to realize the integrated design of power supply and lighting control. The utility model provides effective technical support for the safe and reliable power supply of tunnel lighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the system structure of the utility model (6-pulse rectification);

[0018] Figure 2This is a schematic diagram of the system structure of the utility model (12-pulse rectification);

[0019] Figure 3 This is a schematic diagram of the system structure of the utility model (18-pulse rectification);

[0020] Figure 4 This is the principle diagram of the 6-pulse rectifier circuit of the utility model;

[0021] Figure 5 This is the principle diagram of the 12-pulse rectifier circuit of the utility model;

[0022] Figure 6 This is the principle diagram of the 18-pulse rectifier circuit of the utility model;

[0023] Figure 7 This is a schematic diagram of the rectifier module of the utility model. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in combination with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0025] Embodiment 1, Figure 1 As shown, an intelligent multi-pulse rectifier DC remote power supply system for tunnel lighting is composed of three parts: a multi-pulse rectifier power supply cabinet, a lighting subsystem and a backstage subsystem. The multi-pulse rectifier power supply cabinet is composed of an AC circuit breaker 1, an AC circuit breaker 2, a three-phase lightning arrester, a current transformer, a multi-function electric energy meter, a 6-pulse rectifier transformer, a transformer temperature acquisition module, an AC side RC overvoltage suppression module, a DC side RC overvoltage suppression module, a rectifier module, a DC lightning arrester, a DC bus, a number of DC circuit breakers, a power module 1, a power module 2, a reserved power module 3, an intelligent controller, a dimming controller, a touch screen, a fan, a cabinet door travel switch, a temperature and humidity sensor, an insulation monitoring module, a terminal block, a wire and a cabinet; the lighting subsystem is composed of lamps, a dimming module and a DC / DC power supply; and the backstage system is composed of a transmission network, a switch and a workstation.

[0026] In Example 1, the 380V AC power of the upper switch cabinet is connected to the multi-pulse rectifier power cabinet through the AC circuit breaker 1. A three-phase power lightning arrester is provided at the access end for lightning protection of the three-phase input AC power. At the same time, a current transformer is provided at the output end of the AC circuit breaker 1 for input loop current measurement. The electric energy meter simultaneously collects the secondary side current of the current transformer and the input loop voltage for electric energy measurement, electric quantity measurement and local display, and is equipped with RS485 communication function to transmit information to the intelligent controller. There are three power modules in the multi-pulse rectifier power cabinet. The input ends of power module 1, power module 2 and reserved power module 3 are connected to the output end of AC circuit breaker 1 through AC circuit breaker 2. Power module 1 is a 24V power module that provides power for the touch screen, cabinet door travel switch, temperature and humidity sensor, insulation monitoring module and temperature measurement host. Power module 2 is a 48V power module that provides power for the fan. Reserved power module 3 can output 24V and 48V at the same time as a backup reserve; the input AC 380V is rectified by a 6-pulse rectifier transformer and then input into the rectifier module to rectify and output DC 400V to the positive and negative busbars. The schematic diagram of the 6-pulse rectifier circuit is as follows: Figure 4 , rectifier module composition diagram Figure 7, where the core structure of the 6-pulse rectifier transformer can be a wound core or a stacked core type. The positive and negative busbars are equipped with DC lightning arresters to protect the lines and equipment from short circuits and tripping damage when the DC circuit is overloaded. Multiple DC circuit breakers are connected to the positive and negative busbars, and the output ends of the DC circuit breakers are connected to the corresponding terminal blocks. In order to ensure the service life of the 6-pulse rectifier transformer, temperature acquisition sensors are installed on the windings and cores of each phase of the transformer. The host is fixed on the cabinet to collect the temperature of the windings and cores of each phase of the transformer, and monitor the temperature of the windings and cores in real time to ensure that an alarm is triggered when the temperature reaches the alarm threshold and a trip is triggered when the trip threshold is reached. The alarm or trip signal is output through a hard contact and uploaded to the intelligent controller. The output side of the 6-pulse rectifier transformer is equipped with an AC side RC overvoltage suppression module to prevent overvoltage caused by AC input switch operation or transformer induction; the positive and negative busbars are equipped with a DC side RC overvoltage suppression module to prevent the operating overvoltage generated when the DC circuit breaker is opened and closed from damaging the diode and suppressing residual overvoltage; the multi-pulse rectifier power supply cabinet is also equipped with a fan, cabinet door travel switch, temperature and humidity sensor, insulation monitoring module and touch screen, which are used for cabinet heat dissipation, interlocking with the AC input circuit to ensure personnel safety, real-time collection of temperature and humidity parameters in the cabinet, real-time monitoring of the insulation resistance of the DC positive and negative busbars to the ground and local display, setting of various parameters and local control of dimming. The intelligent controller installed in the multi-pulse rectifier power cabinet is the control core of the whole system. It is composed of CPU unit, memory unit, communication unit, power unit, DI / DO unit, AI / AO unit and corresponding software. It is used for collecting input signals, data processing, data storage, control and communication functions. The power input port is used to power the intelligent controller, RS485 is used to receive the collected signals of the electric energy meter, temperature and humidity sensor and insulation monitoring module, the human-machine interface is used to connect the touch screen, the DI input is used to input the DI signal, the fan control is used to control the fan operation, the communication port is used to communicate with the upper end, and the dimming control is used to control the dimming controller; at the same time, the dimming controller is highly integrated in the cabinet, eliminating the traditional dimming setting dimming cabinet. The dimming controller can be configured according to the site requirements. One of the following: PWM dimming, 0-5V dimming, 0-10V dimming, power line carrier and RS485 dimming. The DC / DC power supply and dimming module are integrated in the lighting fixtures in the tunnel. The terminal block of the multi-pulse rectifier power supply cabinet is connected to the DC / DC power supply of the tunnel lighting fixture through a cable to convert it into the power required by the lighting fixture. At the same time, the dimming function is completed by the dimming module in the lighting fixture according to the on-site dimming requirements. The communication port of the intelligent controller in the multi-pulse rectifier power supply cabinet is connected to the switch in the control room through the communication network and connected to the workstation, realizing remote intelligent dimming, monitoring and control of the multi-pulse rectifier power supply cabinet in the tunnel.

[0027] Embodiment 2, Figure 2As shown, an intelligent multi-pulse rectifier DC remote power supply system for tunnel lighting is composed of three parts: a multi-pulse rectifier power supply cabinet, a lighting subsystem and a background subsystem. Among them, the multi-pulse rectifier power supply cabinet is composed of AC circuit breaker 1, AC circuit breaker 2, a three-phase lightning arrester, a current transformer, a multi-function electric energy meter, a 12-pulse rectifier transformer, a transformer temperature acquisition module, an AC side RC overvoltage suppression module 1, an AC side RC overvoltage suppression module 2, a DC side RC overvoltage suppression module, a rectifier module 1, a rectifier module 2, a DC lightning arrester, a DC bus, a number of DC circuit breakers, a power module 1, a power module 2, a reserved power module 3, an intelligent controller, a dimming controller, a touch screen, a fan, a cabinet door travel switch, a temperature and humidity sensor, an insulation monitoring module, a terminal block, a wire, and a cabinet; the lighting subsystem is composed of lamps, a dimming module and a DC / DC power supply; the background subsystem is composed of a transmission network, a switch and a workstation.

[0028] Embodiment 2, the 380V AC power of the upper switch cabinet is connected to the multi-pulse rectifier power cabinet through the AC circuit breaker 1. A three-phase power lightning arrester is set at the access end for lightning protection of the three-phase input AC power. At the same time, a current transformer is set at the output end of the AC circuit breaker 1 for input loop current measurement. The electric energy meter simultaneously collects the secondary side current of the current transformer and the input loop voltage for electric energy measurement, electric quantity measurement and local display, and is equipped with RS485 communication function to transmit information to the intelligent controller. Three power modules are set in the multi-pulse rectifier power cabinet. The input ends of the power module 1, the power module 2 and the reserved power module 3 are connected to the output end of the AC circuit breaker 1 through the AC circuit breaker 2. The power module 1 is a 24V power module that provides power for the touch screen, the cabinet door travel switch, the temperature and humidity sensor, the insulation monitoring module and the temperature measurement host. The power module 2 is a 48V power module that provides power for the fan. The reserved power module 3 can output 24V and 48V at the same time as a standby reserve. The input AC 380V is rectified by a 12-pulse rectifier transformer and then input to rectifier module 1 and rectifier module 2 in parallel to output DC 400V to the positive and negative busbars. The schematic diagram of the 12-pulse rectifier circuit is as follows: Figure 5 , rectifier module composition diagram Figure 7The core structure of the 12-pulse rectifier transformer can be a wound core or a stacked core. The positive and negative busbars are equipped with DC lightning arresters to protect the lines and equipment from short circuits and tripping damage when the DC circuit is overloaded. Several DC circuit breakers are connected to the positive and negative busbars, and the output ends of the DC circuit breakers are connected to the corresponding terminal blocks. In order to ensure the service life of the 12-pulse rectifier transformer, temperature acquisition sensors are installed on the windings and cores of each phase of the transformer. The host is fixed on the cabinet to collect the temperature of the windings and cores of each phase of the transformer, and monitor the temperature of the windings and cores in real time to ensure that an alarm is triggered when the temperature reaches the alarm threshold and the trip is triggered when the trip threshold is reached. The alarm or trip signal is output through the hard contact and uploaded to the intelligent controller. The output side of the 12-pulse rectifier transformer is provided with an AC side RC overvoltage suppression module 1 and an AC side RC overvoltage suppression module 2, which are used to prevent overvoltage caused by AC input switch operation or transformer induction; a DC side RC overvoltage suppression module is provided on the positive and negative busbars, which is used to prevent the operating overvoltage generated when the DC circuit breaker is opened and closed from damaging the diode and suppressing residual overvoltage; the multi-pulse rectifier power supply cabinet is also provided with a fan, a cabinet door travel switch, a temperature and humidity sensor, an insulation monitoring module and a touch screen, which are used for cabinet heat dissipation, interlocking with the AC input circuit to ensure personnel safety, real-time collection of temperature and humidity parameters in the cabinet, real-time monitoring of the insulation resistance of the DC positive and negative busbars to the ground and local display, setting of various parameters and local control of dimming. The intelligent controller installed in the multi-pulse rectifier power cabinet is the control core of the whole system. It is composed of CPU unit, memory unit, communication unit, power unit, DI / DO unit, AI / AO unit and corresponding software. It is used for collecting input signals, data processing, data storage, control and communication functions. The power input port is used to power the intelligent controller, RS485 is used to receive the collected signals of the electric energy meter, temperature and humidity sensor and insulation monitoring module, the human-machine interface is used to connect the touch screen, the DI input is used to input the DI signal, the fan control is used to control the fan operation, the communication port is used to communicate with the upper end, and the dimming control is used to control the dimming controller; at the same time, the dimming controller is highly integrated in the cabinet, eliminating the traditional dimming setting dimming cabinet. The dimming controller can be configured according to the site requirements. One of the following: PWM dimming, 0-5V dimming, 0-10V dimming, power line carrier and RS485 dimming. The DC / DC power supply and dimming module are integrated in the lighting fixtures in the tunnel. The terminal block of the multi-pulse rectifier power supply cabinet is connected to the DC / DC power supply of the tunnel lighting fixture through a cable to convert it into the power required by the lighting fixture. At the same time, the dimming function is completed by the dimming module in the lighting fixture according to the on-site dimming requirements. The communication port of the intelligent controller in the multi-pulse rectifier power supply cabinet is connected to the switch in the control room through the communication network and connected to the workstation, realizing remote intelligent dimming, monitoring and control of the multi-pulse rectifier power supply cabinet in the tunnel.

[0029] Embodiment 3, Figure 3As shown, an intelligent multi-pulse rectifier DC remote power supply system for tunnel lighting consists of three parts: a multi-pulse rectifier power supply cabinet, a lighting subsystem and a background word system. Among them, the multi-pulse rectifier power supply cabinet consists of an AC circuit breaker, a three-phase lightning arrester, a current transformer, a multi-function electric energy meter, an 18-pulse rectifier transformer, a transformer temperature acquisition module, an AC side RC overvoltage suppression module 1, an AC side RC overvoltage suppression module 2, an AC side RC overvoltage suppression module 3, a DC side RC overvoltage suppression module, a rectifier module 1, a rectifier module 2, a rectifier module 3, a DC lightning arrester, a DC bus, a number of DC circuit breakers, a power module 1, a power module 2, a reserved power module 3, an intelligent controller, a dimming controller, a touch screen, a fan, a cabinet door travel switch, a temperature and humidity sensor, an insulation monitoring module, a terminal block, a wire, and a cabinet; the lighting system consists of lamps, a dimming module and a DC / DC power supply; and the background subsystem consists of a transmission network, a switch and a workstation.

[0030] Embodiment 3, the 380V AC power of the upper switch cabinet is connected to the multi-pulse rectifier power cabinet through the AC circuit breaker 1, and a three-phase power lightning arrester is arranged at the access end for lightning protection of the three-phase input AC power. At the same time, a current transformer is arranged at the output end of the AC circuit breaker 1 for input loop current measurement. The electric energy meter simultaneously collects the secondary side current of the current transformer and the input loop voltage for electric energy metering, electric quantity measurement and local display, and is equipped with RS485 communication function to transmit information to the intelligent controller; three power modules are arranged in the multi-pulse rectifier power cabinet, and the input ends of the power module 1, the power module 2 and the reserved power module 3 are connected to the output end of the AC circuit breaker 1 through the AC circuit breaker 2. The power module 1 is a 24V power module that provides power for the touch screen, the cabinet door travel switch, the temperature and humidity sensor, the insulation monitoring module and the temperature measurement host. The power module 2 is a 48V power module that provides power for the fan. The reserved power module 3 can output 24V and 48V at the same time as a standby reserve. The input AC 380V is rectified by the 18-pulse rectifier transformer and then input to the rectifier module 1, rectifier module 2 and rectifier module 3 in parallel to output DC 400V to the positive and negative busbars. The schematic diagram of the 18-pulse rectifier circuit is as follows: Figure 6 , rectifier module composition diagram Figure 7, The core structure of the 18-pulse rectifier transformer can be selected as a rolled core or a stacked core. The positive and negative busbars are equipped with DC lightning arresters to protect the lines and equipment from short circuits and tripping damage when the DC circuit is overloaded. Several DC circuit breakers are connected to the positive and negative busbars, and the output end of the DC circuit breaker is connected to the corresponding terminal block. In order to ensure the service life of the 18-pulse rectifier transformer, a temperature acquisition sensor is installed on the windings and cores of each phase of the transformer. The host is fixed on the cabinet to collect the temperature of the windings and cores of each phase of the transformer, and monitor the temperature of the windings and cores in real time to ensure that the alarm is triggered when the temperature reaches the alarm threshold, and the trip is triggered when the trip threshold is reached, and the alarm or trip signal is output through the hard contact and uploaded to the intelligent controller. The output side of the 18-pulse rectifier transformer is equipped with an AC side RC overvoltage suppression module 1, an AC side RC overvoltage suppression module 2, and an AC side RC overvoltage suppression module 3 to prevent overvoltage caused by AC input switch operation or transformer induction. The DC side RC overvoltage suppression module is installed on the positive and negative busbars to prevent the operating overvoltage generated when the DC circuit breaker is opened and closed from damaging the diode and suppressing the residual overvoltage. The multi-pulse rectifier power supply cabinet is also equipped with a fan, a cabinet door travel switch, a temperature and humidity sensor, an insulation monitoring module and a touch screen, which are used for cabinet heat dissipation, interlocking with the AC input circuit to ensure personnel safety, real-time collection of temperature and humidity parameters in the cabinet, real-time monitoring of the insulation resistance of the DC positive and negative busbars to the ground and local display, setting various parameters and local control of dimming. The intelligent controller installed in the multi-pulse rectifier power cabinet is the control core of the whole system. It is composed of CPU unit, memory unit, communication unit, power unit, DI / DO unit, AI / AO unit and corresponding software. It is used for collecting input signals, data processing, data storage, control and communication functions. The power input port is used to power the intelligent controller, RS485 is used to receive the collected signals of the electric energy meter, temperature and humidity sensor and insulation monitoring module, the human-machine interface is used to connect the touch screen, the DI input is used to input the DI signal, the fan control is used to control the fan operation, the communication port is used to communicate with the upper end, and the dimming control is used to control the dimming controller; at the same time, the dimming controller is highly integrated in the cabinet, eliminating the traditional dimming setting dimming cabinet, and the dimming controller can be configured according to the site requirements. One of the following: PWM dimming, 0-5V dimming, 0-10V dimming, power line carrier and RS485 dimming. The DC / DC power supply and dimming module are integrated in the lighting fixtures in the tunnel. The terminal block of the multi-pulse rectifier power supply cabinet is connected to the DC / DC power supply of the tunnel lighting fixture through a cable to convert it into the power required by the lighting fixture. At the same time, the dimming function is completed by the dimming module in the lighting fixture according to the on-site dimming requirements. The communication port of the intelligent controller in the multi-pulse rectifier power supply cabinet is connected to the switch in the control room through the communication network and connected to the workstation, realizing remote intelligent dimming, monitoring and control of the multi-pulse rectifier power supply cabinet in the tunnel.

[0031] Through all the above technical solutions, the utility model has the following advantages. 1) Due to the use of DC power supply, it is not affected by line inductive reactance, capacitive reactance and current skin effect, the power loss is small, and the power supply radius is farther; 2) DC power supply can greatly save the amount of cables and save engineering construction investment; 3) DC power supply greatly reduces the risk of electric shock due to leakage; 4) The multi-pulse rectifier transformer is more efficient and has stronger environmental adaptability, and can also improve the overload capacity of the entire system; 5) Temperature sensors are set on each phase winding and core of the multi-pulse rectifier transformer to ensure that the temperature rise of the rectifier transformer is controlled within the limit and the service life of the transformer is extended; 6) The DC-powered lamp driving power supply is DC / DC, which has higher working efficiency and reliability; 7) The multi-pulse rectifier transformer and rectifier module solution have a longer life, higher reliability and less maintenance workload than traditional devices; 8) The dimming function is added to realize the integrated design of power supply and lighting.

[0032] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An intelligent multi-pulse rectifier DC remote power supply system for tunnel lighting, comprising a multi-pulse rectifier power supply cabinet, a lighting subsystem and a backstage subsystem, characterized in that: The multi-pulse rectifier power supply cabinet converts the input AC 380V into DC 400V for long-distance transmission to power the tunnel lamps, and at the same time, it integrates a dimming controller; the multi-pulse rectifier power supply cabinet is composed of an electrically connected AC circuit breaker, a three-phase lightning arrester, a current transformer, a multi-function electric energy meter, a multi-pulse rectifier transformer, a transformer temperature acquisition module, an AC side RC overvoltage suppression module, a DC side RC overvoltage suppression module, a rectifier module, a DC lightning arrester, a DC bus, a DC circuit breaker, a power module, an intelligent controller, a dimming controller, a touch screen, a fan, a cabinet door travel switch, a temperature and humidity sensor, an insulation monitoring module, a terminal block, a wire, and a cabinet body; the lighting subsystem is composed of lamps, a dimming module and a DC / DC power supply; the background subsystem is composed of a transmission network, a switch and a workstation; the power output end of the multi-pulse rectifier power supply cabinet is electrically connected to the power input end of the lighting subsystem, the power output end of the lighting subsystem is electrically connected to the lamps in the tunnel, and the signal output end of the background subsystem is electrically connected to the signal input end of the lighting subsystem.

2. According to claim 1, an intelligent multi-pulse rectified DC remote power supply system for tunnel lighting is characterized in that: The iron core structure type of the multi-pulse rectifier transformer is one of the wound iron core and stacked iron core types; each phase winding and the iron core of the multi-pulse rectifier transformer are provided with a temperature sensor.

3. The intelligent multi-pulse rectified DC remote power supply system for tunnel lighting according to claim 1, characterized in that: The multi-pulse rectifier transformer is one of 6-pulse rectifier transformer, 12-pulse rectifier transformer and 18-pulse rectifier transformer; the 6-pulse rectifier transformer adopts one rectifier module, the 12-pulse rectifier transformer adopts two rectifier modules and the 18-pulse rectifier transformer adopts three rectifier modules.

4. The intelligent multi-pulse rectified DC remote power supply system for tunnel lighting according to claim 1, characterized in that: The lighting subsystem includes lamps, DC / DC driver power supplies and dimming modules. The DC / DC driver power supply converts the input DC 400V into the power required by the lamps.

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