Combined distribution box for power supply simulator and power supply simulator thereof

Abstract

The invention relates to the technical field of power distribution, in particular to a power distribution box for a combined power supply simulator and the power supply simulator thereof.The power distribution box comprises a box body, a simulation chamber is formed in one side of the interior of the box body, a heat exchange chamber is arranged on the other side of the interior of the simulation chamber, and a plurality of frame plates are evenly installed in the simulation chamber at equal intervals; according to the device, the timeliness and effectiveness of circuit breaking protection work are improved, unused energy in the electric energy transmission process can be recycled, the energy-saving effect is greatly improved, and the device is suitable for popularization and application. And moreover, the timeliness and the effectiveness of ventilation and heat exchange work are effectively improved, the working states of the simulator under different external environment temperatures and different ventilation and heat exchange conditions can be dynamically simulated, the diversity of simulation work is greatly improved, the simulation work is richer and more specific, and the reality and the effectiveness of the simulation work are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution, in particular to a combined power distribution box for a power supply simulator and a power supply simulator thereof. Background Art

[0002] Due to the access of a large number of power electronic devices in the current power grid and traction power supply system, the risk of power quality problems such as harmonic resonance, low-frequency oscillation, DC bias magnetism, and ferromagnetic resonance in the power system and railway traction power supply system increases. In severe cases, it may even affect the safe and stable operation of these systems. However, due to the limitations of the actual operation and power supply conditions of the railway and the power consumption mode of the power grid, it is difficult to conduct power quality research in the actual railway traction power supply and power grid. To ensure the reliable power supply of the power system and the safe and stable operation of the railway traction power supply system, stability analysis is usually required, among which impedance analysis is the mainstream analysis method. To obtain the actual impedance of the power supply system, it is necessary to inject small signal harmonic current. The amplitude and phase of the injected harmonic current must be controllable, and external devices need to be introduced.

[0003] In the test system, failure is inevitable, but if it can be simulated and diagnosed before the failure occurs, it will undoubtedly greatly improve the reliability of the system. The power simulator and the distribution box can help us achieve this. The Chinese patent discloses a distribution box suitable for smart grids, the application number is: 201910152341.3. The distribution box protects the distribution box from ground pollutants and water, prevents the box door from being opened or closed by mistake during the work of workers, and increases safety;

[0004] However, the current distribution box is unable to reasonably recycle the unused energy during the operation of the simulator, resulting in energy loss and waste, and poor energy-saving effect. At the same time, it is unable to dynamically simulate the ambient temperature and ventilation and heat exchange status of the simulator, resulting in a single working environment for the simulator, so that the simulation results are one-sided, and the validity and reliability of the simulation results are insufficient. Moreover, the overload protection work of the simulator is not synchronized and efficient enough, and the simulator and the distribution box are easily damaged due to overload. Summary of the invention

[0005] The present invention provides a combined distribution box for a power supply simulator, which can effectively solve the problem mentioned in the above background technology that the current distribution box cannot reasonably recycle the unused energy during the operation of the simulator, resulting in energy loss and waste, and poor energy-saving effect. At the same time, it is unable to dynamically simulate the ambient temperature and ventilation and heat exchange state of the simulator, resulting in a single working environment of the simulator, so that the simulation results are one-sided, the validity and reliability of the simulation results are insufficient, and the overload protection work of the simulator is not synchronized and efficient enough, and the simulator and the distribution box are easily damaged due to overload.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a combined power distribution box for a power supply simulator, comprising a box body, a simulation chamber is provided on one side of the box body, a heat exchange chamber is provided on the other side of the simulation chamber, a plurality of racks are evenly installed at equal intervals inside the simulation chamber, a simulator is installed on the top of the rack, and a protective simulation mechanism is installed on the outside of the simulator;

[0007] The protection simulation mechanism includes a protective shell;

[0008] A number of protective shells are evenly and equidistantly installed on the side end surface of the simulation room at the position corresponding to the simulator, a spacer is installed inside the protective shell, and a number of inductance coils are evenly and equidistantly sleeved on the outer curved surface of the spacer, conductive rods are slidably installed at both ends of the spacer, a contact is installed at one end of the conductive rod at the position inside the spacer, a terminal is installed at the other end of the conductive rod, and a bar box is installed at the bottom end of the protective shell;

[0009] Both ends of the strip box are embedded with sliding rods, one end of the sliding rod is installed with a plug inside the strip box, a catheter is installed in the middle of the top of the strip box, an air bag is installed on the side wall of the partition tube, a flat tube is installed on the edge of the side end surface of the strip box, a right-angle tube is installed in the middle of the bottom end of the strip box, a number of plate boxes are evenly embedded and installed on the top of the frame plate, a flat tube is installed on one side of the bottom end of the strip box, and a sensor is embedded and installed on the other end of the sliding rod.

[0010] Preferably, a plurality of shells are evenly and equidistantly installed on the side end surface of the heat exchange chamber, a rotor is rotatably installed in the inner cavity of the shell, a plurality of windings are embedded and installed at equal angles along the circumferential direction on the outer wall of the shell, a permanent magnet is installed at the position of the winding corresponding to the inclined surface of the rotor, an impeller is embedded and rotatably installed at one end of the shell, a heating rod is installed in the middle of the other end of the shell, a coil is wound at the position of the heating rod corresponding to the outer curved surface of the shell, a switch is installed in the middle of the side end surface of the shell, a tube body is installed on one side of the outer curved surface of the shell, and an air guide seat is embedded and installed on the inner wall of the simulation chamber;

[0011] The outer diameter of the contact is smaller than the inner diameter of the inner cavity of the spacer tube, and the inner cavity of the spacer tube is in a vacuum state at a position outside the contact.

[0012] Preferably, the sum of the length of the sliding rod, the outer diameter of the conduit and the thickness of the plug is equal to the sum of the length of the conductive rod and the thickness of the contact, and the sliding distance of the contact is smaller than the distance between the plug and the end of the flat tube.

[0013] Preferably, the space between the two plugs in the inner cavity of the strip box is connected to the inner cavity of the airbag through a catheter, the inner cavity of the airbag is filled with helium, the space between the two plugs in the inner cavity of the strip box is connected to the inner cavity of the plate box through a right-angle tube, and the space outside the inner cavity of the shell outside the heating rod is connected to the air guide seat through a tube body.

[0014] Preferably, the end of the sliding rod is fixedly connected to the terminal, the sliding rod is an insulating rod, the sensor is a temperature sensor, the inductor coil is connected to the switch through a winding, the winding is connected to the coil through a switch, and the sensor and the switch input end are connected to an external terminal.

[0015] Preferably, a misoperation protection mechanism is installed on one side of the protection simulation mechanism, and the misoperation protection mechanism includes a guide seat;

[0016] A connecting chamber is provided inside the box body at a position on one side of the heat exchange chamber, a guide seat is installed at the side end surface of the connecting chamber corresponding to the position of the simulation chamber, and the end of the flat tube is connected to the inner cavity of the guide seat, a bent pipe is installed on the top of the side end surface of the guide seat, an air storage box is installed on the top of the connecting chamber, a flat plug is slidably installed inside the air storage box, a screw rod is embedded and rotatably installed on one side of the side end surface of the air storage box, and a pressure gauge is embedded and installed on the other side of the side end surface of the air storage box;

[0017] A pipe group seat is installed on the outside of the guide seat, a plug is installed at the position of the right-angle pipe corresponding to the side end surface of the pipe group seat, a connecting pipe is installed in the middle of the other side end surface of the pipe group seat, a limit box is installed at the end of the connecting pipe, a buffer box is installed at the bottom of the limit box, an adjustment box is installed at the top of the limit box, and a horizontal plug plate is slidably installed inside the buffer box;

[0018] A horizontal plug plate is slidably installed inside the regulating box, a screw is rotatably embedded in the middle of the top of the regulating box, valves are embedded in the middle of the side end face of the limit box and at the bottom of one end face of the buffer box, a clamping tube is installed at the end of the valve, and a pressure gauge is embedded at the bottom of the other end face of the buffer box.

[0019] Preferably, the inner cavity of the air storage box located between the pressure gauge and the flat plug is filled with helium, and the space in the inner cavity of the air storage box located between the pressure gauge and the flat plug is connected to the guide seat through a bent pipe, and the screw rod is connected to the flat plug through a thread.

[0020] Preferably, the inner cavity of the tube assembly seat is connected to the right-angle tube through an insert tube, the inner cavity volume of the air storage box is the same as the inner cavity volume of the regulating box, and the screw is connected to the driving plug through a thread.

[0021] Preferably, the space of the buffer box inner cavity located at the bottom of the horizontal plug plate and the limit box inner cavity are both connected to the card tube through a valve, and the space of the regulating box inner cavity located at the bottom of the driving plug is connected to the end of the card tube, the space of the buffer box inner cavity located at the bottom of the horizontal plug plate and the space of the regulating box inner cavity located at the bottom of the driving plug are both filled with helium, and the top of the limit box inner cavity is directly connected to the bottom of the buffer box inner cavity.

[0022] Preferably, a power simulator, according to a power simulator in a distribution box for a combined power supply simulator, comprises an input terminal, a transformer, a multi-module H-bridge converter, a switch control circuit, a harmonic generator and a test function module;

[0023] The switch control circuit includes S1, S2, S3, S4, S5, S6, and S7, which are used to control the working mode switching of the power simulator;

[0024] When switches S1, S2, and S3 are closed, and switches S4, S5, S6, and S7 are disconnected, the power simulator can be used as a single-phase 25kV traction power supply simulator to inject harmonic disturbances into the traction power supply system. The injected harmonic disturbances can reach 5kV. This power simulator supports the service research of high-voltage equipment such as roof and line lightning arresters, and can also simulate the harmonic resonance, low-frequency oscillation, DC bias magnetism, and ferromagnetic resonance power supply environment in the traction power supply system, and can be used as an impedance test power supply for power electronic equipment connected to the 25kV traction power supply.

[0025] When S1, S2, and S3 are disconnected and S4, S5, S6, and S7 are closed, the power supply simulator can be used as a three-phase 10kV power supply simulator to support research on issues related to 600kW three-phase power systems.

[0026] Compared with the prior art, the invention has the following beneficial effects: the invention has a scientific and reasonable structure and is safe and convenient to use;

[0027] 1. A protective simulation mechanism is provided. Through the coordination of the protective shell, the spacer, the conductive rod, the contact and the terminal, an auxiliary wiring structure can be constructed to effectively improve the convenience and stability of the line connection and disconnection, and effectively enhance the compatibility and connection stability between the simulation operation and the safety protection work during the simulation operation. With the help of the strip box, the slide bar, the plug, the guide tube, the air bag, the flat tube, the plate box and the flat tube, an elastic connection and disconnection structure can be formed. On the one hand, the elastic locking of the joint can be realized during the normal simulation operation, so that the connection stress at the joint rises and falls synchronously with the simulated load pressure, which greatly improves the stability and reliability of the connection at the joint, makes the power transmission more stable and efficient, and effectively enhances the smoothness of the simulation operation. On the other hand, the dual temperature measurement and control of the joint and the simulation room can be realized during the simulation operation, which can effectively use the heat as the driving force in the power transmission process, and quickly and efficiently realize the elastic circuit breaker protection when the simulator is overloaded, which greatly improves the timeliness, effectiveness and reliability of the circuit breaker protection work, and effectively solves the problem that the simulator and the distribution box are damaged due to the overload of the simulator output.

[0028] 2. An electromagnetic conversion structure can be constructed by cooperating with conductive rods, contacts, terminals, inductor coils, casings, rotors, permanent magnets, windings and impellers, which can convert and utilize electromagnetic energy in the simulation operation process, realize the recycling of unused energy in the process of electric energy transmission, and transform electromagnetic energy into driving force. This not only effectively improves the effective utilization rate of energy in the simulation operation process, realizes ventilation and heat exchange in the absence of external energy, greatly improves the energy-saving effect, but also effectively improves the timeliness and effectiveness of ventilation and heat exchange work. With the dynamic temperature control function of heating rods, coils, switches, tubes, air guide seats, right-angle tubes and sensors, the unused energy in the process of electric energy transmission can be further transformed into a power source to dynamically adjust the working environment temperature of the simulator, forming a dynamic environment simulation structure, which can dynamically simulate the working state of the simulator under different external environment temperatures and different ventilation and heat exchange conditions, greatly improving the diversity of simulation operations, making the simulation work more rich and specific, and improving the authenticity and effectiveness of simulation operations.

[0029] 3. A misoperation protection mechanism is provided. By cooperating with the guide seat, elbow, air storage box, flat plug, screw and pressure gauge, a pressure limiting protection structure can be constructed. The load threshold of the simulator during the simulation operation can be dynamically limited according to actual needs, which not only effectively enhances the safety and stability of the simulator during operation, but also enriches the flexibility and variability of the simulation operation, so that the simulation operation can adapt to different simulation threshold requirements, effectively expanding the adaptability of the simulation operation. With the limit box, buffer box, adjustment box, horizontal plug plate, drive plug, screw and pressure gauge, the working state of the simulation operation can be dynamically divided, which is equivalent to realizing the synchronous detection of the working state of the simulator, greatly improving the stability and reliability of the simulator;

[0030] Equipped with the current limiting and conveying functions of the pipe assembly seat, insert pipe, connecting pipe, valve and clamp pipe, on the one hand, it can quickly realize the synchronous on-off adjustment of each joint, greatly improving the efficiency, reliability and convenience of the circuit on-off work, making the simulation work safer; on the other hand, it can accurately distinguish the normal state, high load state and overload state of the simulator, and can effectively avoid the false operation of the circuit breaker protection during the simulation process, causing the circuit to be cut off, thereby affecting the continuity of the simulation operation; at the same time, it can make the overload protection work more balanced and smooth, more efficient and synchronous, and more timely, which can improve the effectiveness of overload protection while ensuring the continuity of the simulation operation.

[0031] To sum up, this distribution box can effectively utilize the heat energy generated during the simulation operation of the simulator, and can recycle the unused energy in the process of power transmission, greatly improving the effective utilization rate of energy, realizing real-time overload protection for simulated operations, and can dynamically simulate the working environment temperature and ventilation and heat exchange status of the simulator, effectively improving the richness and diversity of simulated operations and the real effectiveness, and at the same time can effectively avoid the false triggering of circuit breaker protection work, while ensuring the continuity of simulated operations and making the circuit breaker protection work more accurate, smoother, more stable and efficient.

[0032] 4. The power simulator of the present invention can simulate single-phase traction power supply systems and three-phase power systems to meet the testing requirements of different power systems. It adopts multi-winding transformers and modular H-bridge converters, can flexibly configure output voltage and power, adapt to different voltage level requirements, and support the simulation of complex power environments such as harmonics, low-frequency oscillations, and DC bias magnetism. It is suitable for research during the service of high-voltage equipment to ensure the stability and safety of the system. It can also be used for equipment testing in electric traction power supply systems, such as high-voltage testing of lightning arresters and impedance testing of other power electronic equipment. This method only requires one-phase power supply, that is, the single-phase traction network is used as the power supply, and the output is controllable and the control is flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a schematic diagram of the structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the simulator installation structure of the present invention;

[0036] Figure 3 It is a schematic diagram of the protective shell installation structure of the present invention;

[0037] Figure 4 It is a schematic diagram of the structure of the protection simulation mechanism of the present invention;

[0038] Figure 5 It is a schematic diagram of the conductive rod installation structure of the present invention;

[0039] Figure 6 It is a partial exploded view of the protection simulation mechanism of the present invention;

[0040] Figure 7 It is a schematic diagram of the right-angle tube installation structure of the present invention;

[0041] Figure 8 It is a structural schematic diagram of the misoperation protection mechanism of the present invention;

[0042] Fig. 9 It is a schematic diagram of the installation structure of the drive plug of the present invention;

[0043] Fig.10 is a schematic diagram of the circuit structure of the power simulator of the present invention;

[0044] Reference numerals in the figure: 100, box; 101, simulation chamber; 102, heat exchange chamber; 103, shelf; 104, simulator; 105, connection chamber;

[0045] 200, protection simulation mechanism; 201, protective shell; 202, spacer; 203, inductor; 204, conductive rod; 205, contact; 206, terminal; 207, strip box; 208, slide bar; 209, plug; 210, catheter; 211, air bag; 212, flat tube; 213, shell; 214, rotor; 2141, permanent magnet; 215, winding; 216, impeller; 217, heating rod; 218, coil; 219, switch; 220, tube body; 221, air guide seat; 222, right-angle tube; 223, plate box; 224, flat tube; 225, sensor;

[0046] 300, misoperation protection mechanism; 301, guide seat; 302, elbow; 303, air storage box; 304, flat plug; 305, screw rod; 306, pressure gauge; 307, pipe assembly seat; 308, insert pipe; 309, connecting pipe; 310, limit box; 311, buffer box; 312, adjustment box; 313, horizontal plug plate; 314, drive plug; 315, screw rod; 316, valve; 317, clamping tube; 318, pressure gauge. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0048] Embodiment 1:

[0049] like Figure 1-9 As shown, the present invention provides a technical solution, a combined power distribution box for a power supply simulator, including a box body 100, a simulation chamber 101 is opened on one side of the box body 100, a heat exchange chamber 102 is arranged on the other side of the simulation chamber 101, a plurality of racks 103 are evenly installed in the simulation chamber 101, a simulator 104 is installed on the top of the rack 103, and a protective simulation mechanism 200 is installed on the outside of the simulator 104;

[0050] The protection simulation mechanism 200 includes a protective shell 201, a spacer 202, an inductor 203, a conductive rod 204, a contact 205, a terminal 206, a bar box 207, a slide bar 208, a plug 209, a guide tube 210, an air bag 211, a flat tube 212, a housing 213, a rotor 214, a permanent magnet 2141, a winding 215, an impeller 216, a heating rod 217, a coil 218, a switch 219, a tube body 220, an air guide seat 221, a right-angle tube 222, a plate box 223, a flat tube 224 and a sensor 225;

[0051] A plurality of protective shells 201 are evenly and equidistantly installed at the side end surface of the simulation room 101 at the position corresponding to the simulator 104, a partition 202 is installed inside the protective shell 201, and a plurality of inductance coils 203 are evenly and equidistantly sleeved on the outer curved surface of the partition 202, and conductive rods 204 are slidably installed at both ends of the partition 202, and a contact 205 is installed at one end of the conductive rod 204 at a position inside the partition 202, and the outer diameter of the contact 205 is smaller than the inner diameter of the inner cavity of the partition 202, and the inner cavity of the partition 202 is in a vacuum state at a position outside the contact 205, so as to control the on-off of the circuit and extinguish the arc, and a terminal 206 is installed at the other end of the conductive rod 204, and a bar box 207 is installed at the bottom end of the protective shell 201;

[0052] Both ends of the strip box 207 are embedded with a slide bar 208 for sliding installation. One end of the slide bar 208 is located inside the strip box 207 and a plug 209 is installed. A guide tube 210 is installed in the middle of the top of the strip box 207. An air bag 211 is installed on the side wall of the partition tube 202. A flat tube 212 is installed on the side edge of the strip box 207. The sum of the length of the slide bar 208, the outer diameter of the guide tube 210 and the thickness of the plug 209 is equal to the sum of the length of the conductive rod 204 and the thickness of the contact 205. The sliding distance of the contact 205 is less than the distance between the plug 209 and the end of the flat tube 212, so as to achieve circuit protection.

[0053] A right-angle tube 222 is installed at the middle of the bottom end of the strip box 207, and a plurality of plate boxes 223 are evenly embedded and installed at the top of the frame plate 103. The inner cavity of the strip box 207 is located between the two plugs 209 and is connected to the inner cavity of the air bag 211 through the conduit 210. The inner cavity of the air bag 211 is filled with helium. The inner cavity of the strip box 207 is located between the two plugs 209 and is connected to the inner cavity of the plate box 223 through the right-angle tube 222. The inner cavity of the shell 213 is located outside the heating rod 217 and is connected to the air guide seat 221 through the tube body 220 to improve the flow stability of the driving medium.

[0054] A flat tube 224 is installed at one side of the bottom end of the bar box 207, and a sensor 225 is embedded and installed at the other end of the slide bar 208. The end of the slide bar 208 is fixedly connected to the terminal 206. The slide bar 208 is an insulating rod. The sensor 225 is a temperature sensor. The inductor 203 is connected to the switch 219 through the winding 215. The winding 215 is connected to the coil 218 through the switch 219. The input ends of the sensor 225 and the switch 219 are connected to the external terminal to control the temperature.

[0055] A number of shells 213 are evenly and equidistantly installed on the side end surface of the heat exchange chamber 102, a rotor 214 is rotatably installed in the inner cavity of the shell 213, a number of windings 215 are embedded and installed at equal angles on the outer wall of the shell 213 along the circumferential direction, a permanent magnet 2141 is installed at the position of the winding 215 on the inclined surface of the rotor 214, an impeller 216 is embedded and rotatably installed at one end of the shell 213, a heating rod 217 is installed in the middle of the other end of the shell 213, a coil 218 is wound on the outer curved surface of the shell 213 corresponding to the position of the heating rod 217, a switch 219 is installed in the middle of the side end surface of the shell 213, a tube body 220 is installed on one side of the outer curved surface of the shell 213, and an air guide seat 221 is embedded and installed on the inner wall of the simulation chamber 101.

[0056] A malfunction protection mechanism 300 is installed on one side of the protection simulation mechanism 200, and the malfunction protection mechanism 300 includes a guide seat 301, a bent pipe 302, an air storage box 303, a flat plug 304, a screw rod 305, a barometer 306, a pipe assembly seat 307, a plug 308, a connecting pipe 309, a limit box 310, a buffer box 311, an adjustment box 312, a horizontal plug plate 313, a driving plug 314, a screw rod 315, a valve 316, a clamping tube 317 and a pressure gauge 318;

[0057] A connecting chamber 105 is provided inside the box body 100 at one side of the heat exchange chamber 102. A flow guide seat 301 is installed at the side end surface of the connecting chamber 105 corresponding to the position of the simulation chamber 101, and the end of the flat tube 224 is connected to the inner cavity of the flow guide seat 301. A bent pipe 302 is installed at the top of the side end surface of the flow guide seat 301. An air storage box 303 is installed at the top of the connecting chamber 105. A flat plug 304 is slidably installed inside the air storage box 303. A screw rod 305 is embedded and rotatably installed on the side, and a barometer 306 is embedded and installed on the other side of the side end surface of the gas storage box 303. The inner cavity of the gas storage box 303 is located between the barometer 306 and the flat plug 304 and is filled with helium. The space between the barometer 306 and the flat plug 304 in the inner cavity of the gas storage box 303 is connected to the guide seat 301 through a bend 302, and the screw rod 305 is connected to the flat plug 304 through a thread to limit the safety threshold;

[0058] A pipe assembly seat 307 is installed on the outside of the guide seat 301, and an insert pipe 308 is installed at the position of the right-angle pipe 222 on the side end surface of the pipe assembly seat 307. A connecting pipe 309 is installed in the middle of the other side end surface of the pipe assembly seat 307. A limit box 310 is installed at the end of the connecting pipe 309. A buffer box 311 is installed at the bottom of the limit box 310. An adjustment box 312 is installed at the top of the limit box 310. A horizontal plug plate 313 is slidably installed inside the buffer box 311.

[0059] A horizontal plug plate 313 is slidably installed inside the regulating box 312, a screw rod 315 is rotatably installed in the middle of the top of the regulating box 312, the inner cavity of the tube group seat 307 is connected to the right-angle tube 222 through the insert 308, the inner cavity volume of the air storage box 303 is the same as the inner cavity volume of the regulating box 312, the screw rod 315 is connected to the driving plug 314 through a thread to maintain the load on-off stability, the middle of the side end face of the limit box 310 and the bottom of the side end face of the buffer box 311 are embedded with valves 316, the inner cavity of the buffer box 311 is located at the space at the bottom of the horizontal plug plate 313 and the limit box 31 0 inner cavities are connected with the card tube 317 through the valve 316, and the space of the inner cavity of the regulating box 312 located at the bottom of the driving plug 314 is connected with the end of the card tube 317, the space of the inner cavity of the buffer box 311 located at the bottom of the horizontal plug plate 313 and the space of the inner cavity of the regulating box 312 located at the bottom of the driving plug 314 are filled with helium, the top of the inner cavity of the limit box 310 is directly connected with the bottom of the inner cavity of the buffer box 311 to avoid false triggering of the circuit breaker protection, the end of the valve 316 is installed with the card tube 317, and the bottom of the other side end surface of the buffer box 311 is embedded with a pressure gauge 318.

[0060] Working principle and use process of the present invention: During the actual use of the distribution box, firstly, the box body 100 is stably placed in the working area, the box body 100 is opened, the valve 316 corresponding to the limit box 310 is opened, and the screw 315 is rotated to drive the helium at the bottom of the driving plug 314 to be pressed into the limit box 310 through the clamping tube 317, and then the helium will enter the tube assembly seat 307 through the connecting pipe 309, and under the connection of the insert tube 308, enter each bar box 207 through the right-angle tube 222, press the plug 209, and force the two plugs 209 in the same bar box 207 to move away from each other under the pressure of air pressure, and drive the terminal 206 to move synchronously through the sliding rod 208, so that the two contacts 205 in the same partition tube 202 are separated under the drive of the conductive rod 204, and the connection between each contact 205 is cut off;

[0061] In the above process, as each plug 209 moves, it squeezes the helium inside the box 207 and outside the slide bar 208, forcing it to enter the guide seat 301 through the flat tube 224, and enter the air storage box 303 through the curved tube 302, forcing the internal air pressure of the air storage box 303 to increase. In the above adjustment process, the adjustment process can be controlled according to the reading of the barometer 306. When the reading of the barometer 306 rises, it means that each plug 209 has correspondingly slid, and each contact 205 has been separated. Then, the simulator 104 can be installed in the simulation room 101, and according to actual needs, the corresponding wiring work is carried out, and the simulator 104 is connected to the corresponding external test circuit through each terminal 206;

[0062] After the connection work is completed, normal simulation operation can be carried out. At this time, the screw rod 305 is rotated to drive the flat plug 304 to move, and the helium inside the gas storage box 303 is pressed into the guide seat 301 through the bent pipe 302. Under the conduction of the flat tube 224, the helium is filled into the gap between the inner cavity of each box 207 and the outer side of the slide bar 208, forcing each plug 209 to move toward each other, and the corresponding terminal 206 is driven by the slide bar 208 to move synchronously, so that the two contacts 205 inside each spacer 202 are driven by the conductive rod 204 to abut against each other, and the connection between the simulator 104 and the corresponding external test circuit is connected;

[0063] Here, the end surface of each plug 209 connected to the slide bar 208 is the outer end surface. At this time, the air pressure on the outer end surface of each plug 209 can be adjusted according to the reading of the barometer 306. From the above adjustment, it can be known that under the action of this air pressure, the two contacts 205 inside each partition 202 are tightly pressed together, that is, the greater the air pressure, the more stable the connection between the two contacts 205 inside the partition 202. This air pressure is the connection pressure.

[0064] In the process of adjusting the connection air pressure, the valve 316 corresponding to the buffer box 311 can be opened and the valve 316 corresponding to the limit box 310 can be closed, and the screw 315 can be rotated to press the helium inside the adjustment box 312 into the buffer box 311 through the clamping tube 317, forcing the horizontal plug plate 313 to fit tightly with the end face of the limit box 310 under the action of air pressure. The air pressure at the bottom of the horizontal plug plate 313 can be limited according to the reading of the pressure gauge 318. The air pressure is the buffer air pressure. It should be noted here that the buffer air pressure should be less than the connection air pressure and greater than the air pressure on the inner end face of each plug head 209, so that the two contacts 205 inside each partition 202 maintain a tendency to move toward each other during normal operation, enter a pre-disconnection state during high-load operation, and automatically disconnect when overloaded;

[0065] During the simulation operation, as the simulation operation proceeds, the contact 205 will emit heat, causing the temperature inside the partition 202 to rise, and the air pressure inside the airbag 211 will also rise synchronously with the temperature, forcing the helium inside the airbag 211 to enter the strip box 207 through the conduit 210 under the action of air pressure to squeeze the inner end surface of the plug 209. At the same time, as the simulation operation proceeds, the simulator 104 will also heat up accordingly, causing the temperature inside the heat exchange chamber 102 to rise, and the air pressure inside each plate box 223 will also rise synchronously with the temperature, forcing the air inside the plate box 223 to enter the strip box 207 through the right-angle tube 222 under the action of air pressure to squeeze the inner end surface of the plug 209, causing the air pressure on the inner end surface of the plug 209 to rise;

[0066] When the air pressure on the inner end surface of each plug 209 is less than the buffer air pressure, it is insufficient to overcome the air pressure on the outer end surface of the plug 209 and push the plug 209 to move. The helium between the two plugs 209 in the box 207 will be pressed into the limit box 310 under the action of the air pressure. At this time, the air pressure on the inner end surface of each plug 209 is in a normal state.

[0067] When the air pressure on the inner end face of each plug 209 is greater than the buffer air pressure but less than the connection air pressure, the horizontal plug plate 313 will drop under the extrusion of the air pressure, and the horizontal plug plate 313 will compress the bottom air pressure to buffer and dilute the air pressure on the top, so as to maintain the stability of the air pressure on the inner end face of each plug 209. At this time, the air pressure on the inner end face of each plug 209 is in a high-load state, and the connection between each contact 205 enters a pre-disconnection state. When the air pressure on the inner end face of each plug 209 is greater than the connection air pressure, the air pressure on the inner end face of each plug 209 is in an overload state, and each plug 209 will move away under the action of the air pressure.

[0068] In the above process, the air pressure on the inner end face of the plug 209 corresponds to the temperature at the contact 205 and the temperature inside the simulation chamber 101. The temperature changes at the contact 205 and the temperature changes inside the simulation chamber 101 correspond to the load state of the simulator 104. Then, by constraining the air pressure on the inner end face of the plug 209, the load state of the simulator 104 can be constrained.

[0069] Furthermore, the normal working state, high-load working state and overload working state of the simulator 104 are distinguished, so that when the simulator 104 is overloaded, that is, when the air pressure on the inner end face of each plug 209 is in an overload state, the connection of the contact 205 is automatically cut off, and the high-load state is used as a buffer for the normal working state and the overload state, so as to avoid the contact 205 from malfunctioning during the simulation operation, resulting in the circuit being cut off and affecting the continuity of the test, that is, by adjusting the size of the buffer air pressure and the connection air pressure, the normal, high-load and overload ranges of the air pressure on the inner end face of the plug 209 can be delineated, so as to accurately control the on and off of the contact 205;

[0070] Also in the simulation operation process, as the current flows through the conductive rod 204 and the contact 205, an induced current is generated at the inductor 203, which cooperates with the winding 215 and the coil 218 to generate corresponding magnetic fields at the rotor 214 and the heating rod 217 respectively, forcing the permanent magnet 2141 to drive the rotor 214 to rotate under the action of the magnetic field, and causing the heating rod 217 to generate heat due to the eddy current generated inside. At the same time, the impeller 216 will rotate synchronously driven by the rotor 214, pressurizing the external air into the housing 213, and then the airflow is heated into a hot airflow when it flows through the external space of the heating rod 217;

[0071] Subsequently, the hot air flow will be sent into the air guide seat 221 through the pipe body 220, and will be evenly sprayed into the simulation chamber 101 through the air guide seat 221 to adjust the temperature inside the simulation chamber 101. The temperature inside the simulation chamber 101 can be fed back to the external terminal in real time through the sensor 225. The external terminal can limit the on and off state of the coil 218 through the switch 219, so as to limit the heating state of the heating rod 217, and simulate the external working environment temperature of the simulator 104. At the same time, with the airflow conveying function of the impeller 216, the ventilation and heat exchange state of the simulation chamber 101 can be limited, and the working state under different external environment temperatures and different ventilation and heat exchange states can be simulated and restored, thereby providing different working environments for the simulator 104.

[0072] Embodiment 2:

[0073] like Fig.10 As shown, a power simulator is used for simulating a single-phase 25kV traction power supply;

[0074] The high-voltage sides of the three groups of single-phase multi-winding transformers are connected to the power grid through switch circuit breakers. The voltage on the high-voltage side is the line voltage. The secondary-side output of a single multi-winding transformer is connected to a single-phase H-bridge back-to-back converter as the input of the converter. The secondary-side AC voltage is converted into DC power through a rectifier, and then outputs single-phase AC power with controllable amplitude and frequency through an inverter link. The output AC power can output a single-phase AC voltage of 0-33kV or a three-phase AC voltage of 0-11kV through a switch circuit.

[0075] The single-phase multi-winding transformer converts three-phase AC power into single-phase AC power through a single-phase H-bridge AC-DC converter. On the basis of the cascade of single-phase AC-DC converters, the output voltage can be converted between three-phase AC power and single-phase AC by controlling the switch circuit. In the specific implementation method, when switches S1, S2, and S3 are closed and switches S4, S5, S6, and S7 are opened, the AC output sides of the single-phase H-bridge AC-DC converters connected by the three single-winding transformers are cascaded with each other, and single-phase AC power with controllable amplitude, phase, and frequency can be output between ad, wherein the amplitude range of the output single-phase AC voltage is 0-33kV, which can be used as a simulation power supply, and the output AC voltage can be applied to the arrester installed on the roof of the electric locomotive and the line arrester for withstand voltage test, and the AC voltage installed in the railway traction high-voltage equipment system can be tested. The roof lightning arrester and line lightning arrester are studied to understand their performance, life and reliability during service, that is, during actual operation and use. At the same time, by controlling the single-phase H-bridge AC-DC converter, the AC-DC-AC converter can output a single-phase AC voltage, and the voltage amplitude, phase and frequency are all controllable. In this scheme, harmonics in the range of 0-5050Hz can be generated, and the generated harmonic amplitude can reach 5kV. The generated harmonic signal is superimposed on the fundamental voltage, and the power supply environment such as harmonic resonance, low-frequency oscillation, DC bias magnetism, and ferromagnetic resonance in the traction power supply system can be simulated to simulate various power quality that may be encountered in the railway traction power supply system. At the same time, the scheme can inject small signal harmonic disturbances into the traction network to obtain the harmonic impedance of the traction power supply system, which is convenient for stability analysis of the traction power supply system.

[0076] Embodiment 3:

[0077] like Fig.10 As shown, a power simulator is used for simulating a three-phase 10kV power grid power supply;

[0078] The high-voltage sides of the three groups of single-phase multi-winding transformers are connected to the power grid through switch circuit breakers. The voltage on the high-voltage side is the line voltage. The secondary-side output of a single multi-winding transformer is connected to a single-phase H-bridge back-to-back converter as the input of the converter. The secondary-side AC voltage is converted into DC power through a rectifier, and then outputs single-phase AC power with controllable amplitude and frequency through an inverter link. The output AC power can output a single-phase AC voltage of 0-33kV or a three-phase AC voltage of 0-11kV through a switch circuit.

[0079] When switches S1, S2, and S3 are disconnected and switches S4, S5, S6, and S7 are closed, the AC power output by the AC-DC-AC converter is combined through three single-phase multi-winding transformers to output three-phase AC power, where the output amplitude range of the three-phase AC power is 0-11kV. It can be used as a three-phase 10kV power supply simulator to simulate the power quality such as three-phase imbalance, harmonic pollution, and voltage fluctuation that may occur in the power system. At the same time, it supports the research on related issues of three-phase power systems with a power level of 600kW. This mode is mainly used to study related issues in three-phase power systems, such as complex power grid environments such as power fluctuations, voltage imbalance, and three-phase short circuits. Through the coordinated work of multiple H-bridge converters, the power supply simulator can accurately simulate the dynamic characteristics of the three-phase power system.

[0080] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combined power distribution box for a power supply simulator, comprising a box body (100), characterized in that: A simulation chamber (101) is provided on one side of the box body (100), a heat exchange chamber (102) is provided on the other side of the simulation chamber (101), a plurality of racks (103) are evenly and equidistantly installed inside the simulation chamber (101), a simulator (104) is installed on the top of the rack (103), and a protective simulation mechanism (200) is installed on the outside of the simulator (104); The protection simulation mechanism (200) comprises a protective shell (201); A plurality of protective shells (201) are evenly and equidistantly installed on the side end surface of the simulation chamber (101) at the position corresponding to the simulator (104); a spacer (202) is installed inside the protective shell (201); a plurality of inductance coils (203) are evenly and equidistantly sleeved on the outer curved surface of the spacer (202); conductive rods (204) are slidably installed at both ends of the spacer (202); a contact (205) is installed at one end of the conductive rod (204) at a position inside the spacer (202); a terminal (206) is installed at the other end of the conductive rod (204); and a bar box (207) is installed at the bottom end of the protective shell (201); Both ends of the strip box (207) are embedded with sliding rods (208), one end of the sliding rod (208) is installed with a plug (209) at an internal position of the strip box (207), a catheter (210) is installed in the middle of the top of the strip box (207), an air bag (211) is installed on the side wall of the partition tube (202), a flat tube (212) is installed on the edge of the side end face of the strip box (207), a right-angle tube (222) is installed in the middle of the bottom end of the strip box (207), a plurality of plate boxes (223) are evenly embedded and installed at the top of the frame plate (103), a flat tube (224) is installed on one side of the bottom end of the strip box (207), and a sensor (225) is embedded and installed at the other end of the sliding rod (208).

2. A combined power distribution box for a power supply simulator according to claim 1, characterized in that: A plurality of shells (213) are evenly and equidistantly mounted on the side end surface of the heat exchange chamber (102); a rotor (214) is rotatably mounted in the inner cavity of the shell (213); a plurality of windings (215) are embedded and mounted at equal angles on the outer wall of the shell (213) along the circumferential direction; a permanent magnet (2141) is mounted at a position of the winding (215) on the inclined surface of the rotor (214); an impeller (216) is embedded and rotatably mounted on one end of the shell (213); a heating rod (217) is mounted in the middle of the other end of the shell (213); a coil (218) is wound on the outer curved surface of the shell (213) at a position corresponding to the heating rod (217); a switch (219) is mounted in the middle of the side end surface of the shell (213); a tube body (220) is mounted on one side of the outer curved surface of the shell (213); and an air guide seat (221) is embedded and mounted on the inner wall of the simulation chamber (101); The outer diameter of the contact (205) is smaller than the inner diameter of the inner cavity of the spacer (202), and the inner cavity of the spacer (202) is in a vacuum state at a position outside the contact (205).

3. A combined power distribution box for a power supply simulator according to claim 2, characterized in that: The sum of the length of the sliding rod (208), the outer diameter of the conduit (210) and the thickness of the plug (209) is equal to the sum of the length of the conductive rod (204) and the thickness of the contact (205), and the sliding distance of the contact (205) is less than the distance between the plug (209) and the end of the flat tube (212).

4. A combined power distribution box for a power supply simulator according to claim 2, characterized in that: The inner cavity of the strip box (207) located between the two plugs (209) is connected to the inner cavity of the airbag (211) through a conduit (210); the inner cavity of the airbag (211) is filled with helium; the inner cavity of the strip box (207) located between the two plugs (209) is connected to the inner cavity of the plate box (223) through a right-angle tube (222); the inner cavity of the shell (213) located outside the heating rod (217) is connected to the air guide seat (221) through a tube body (220).

5. A combined power distribution box for a power supply simulator according to claim 2, characterized in that: The end of the slide bar (208) is fixedly connected to the terminal (206); the slide bar (208) is an insulating rod; the sensor (225) is a temperature sensor; the inductor coil (203) is connected to the switch (219) via the winding (215); the winding (215) is connected to the coil (218) via the switch (219); and the input ends of the sensor (225) and the switch (219) are connected to external terminals.

6. A combined power distribution box for a power supply simulator according to claim 2, characterized in that: A malfunction protection mechanism (300) is installed on one side of the protection simulation mechanism (200), and the malfunction protection mechanism (300) comprises a flow guide seat (301); A connecting chamber (105) is provided inside the box body (100) at a position on one side of the heat exchange chamber (102); a flow guide seat (301) is installed at a position on the side end surface of the connecting chamber (105) corresponding to the position of the simulation chamber (101); the end of the flat tube (224) is in communication with the inner cavity of the flow guide seat (301); a bent pipe (302) is installed on the top of the side end surface of the flow guide seat (301); an air storage box (303) is installed on the top of the connecting chamber (105); a flat plug (304) is slidably installed inside the air storage box (303); a screw rod (305) is embedded and rotatably installed on one side of the side end surface of the air storage box (303); and a pressure gauge (306) is embedded and installed on the other side of the side end surface of the air storage box (303); A tube assembly seat (307) is installed on the outside of the flow guide seat (301); a plug pipe (308) is installed at the position of the right-angle tube (222) on the side end surface of the tube assembly seat (307); a connecting pipe (309) is installed in the middle of the other side end surface of the tube assembly seat (307); a limit box (310) is installed at the end of the connecting pipe (309); a buffer box (311) is installed at the bottom of the limit box (310); an adjustment box (312) is installed at the top of the limit box (310); and a horizontal plug plate (313) is slidably installed inside the buffer box (311); A horizontal plug plate (313) is slidably mounted inside the regulating box (312), a screw rod (315) is rotatably embedded in the middle of the top end of the regulating box (312), a valve (316) is embedded in the middle of the side end surface of the limit box (310) and the bottom of one end surface of the buffer box (311), a clamping tube (317) is mounted at the end of the valve (316), and a pressure gauge (318) is embedded in the bottom of the other end surface of the buffer box (311).

7. A combined power distribution box for a power supply simulator according to claim 6, characterized in that: The inner cavity of the gas storage box (303) located between the pressure gauge (306) and the flat plug (304) is filled with helium, and the space between the inner cavity of the gas storage box (303) and the pressure gauge (306) and the flat plug (304) is connected to the guide seat (301) through a curved pipe (302), and the screw rod (305) is connected to the flat plug (304) through a thread.

8. The combined power distribution box for a power supply simulator according to claim 6, characterized in that: The inner cavity of the tube assembly seat (307) is connected to the right-angle tube (222) through the insert tube (308), the inner cavity volume of the air storage box (303) is the same as the inner cavity volume of the regulating box (312), and the screw rod (315) is connected to the driving plug (314) through a thread.

9. A combined power distribution box for a power supply simulator according to claim 6, characterized in that: The space of the inner cavity of the buffer box (311) located at the bottom of the horizontal plug plate (313) and the inner cavity of the limit box (310) are both connected to the card tube (317) through the valve (316), and the space of the inner cavity of the regulating box (312) located at the bottom of the driving plug (314) is connected to the end of the card tube (317), the space of the inner cavity of the buffer box (311) located at the bottom of the horizontal plug plate (313) and the space of the inner cavity of the regulating box (312) located at the bottom of the driving plug (314) are both filled with helium, and the top of the inner cavity of the limit box (310) is directly connected to the bottom of the inner cavity of the buffer box (311).

10. A power simulator according to claim 1, characterized in that: A power simulator in a distribution box for a combined power supply simulator according to any one of claims 1 to 9, comprising an input terminal, a transformer, a multi-module H-bridge converter, a switch control circuit, a harmonic generator and a test function module; The switch control circuit includes S1, S2, S3, S4, S5, S6, and S7, which are used to control the working mode switching of the power simulator; When switches S1, S2, and S3 are closed, and switches S4, S5, S6, and S7 are disconnected, the power simulator can be used as a single-phase 25kV traction power supply simulator to inject harmonic disturbances into the traction power supply system. The injected harmonic disturbances can reach 5kV. This power simulator supports the service research of high-voltage equipment such as roof and line lightning arresters, and can also simulate the harmonic resonance, low-frequency oscillation, DC bias magnetism, and ferromagnetic resonance power supply environment in the traction power supply system, and can be used as an impedance test power supply for power electronic equipment connected to the 25kV traction power supply. When S1, S2, and S3 are disconnected and S4, S5, S6, and S7 are closed, the power supply simulator can be used as a three-phase 10kV power supply simulator to support research on issues related to 600kW three-phase power systems.

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