A combined power distribution box for a power supply simulator and its power supply simulator

Abstract

The present invention relates to the field of power distribution technology, and specifically to a distribution box for a combined power supply simulator and its power simulator, including a box body. On one side inside the box body, a simulation chamber is provided. On the other side inside the simulation chamber, a heat exchange chamber is arranged. A number of shelf plates are evenly installed at equal intervals inside the simulation chamber. Simulators are installed at the tops of the shelf plates. A number of protective shells are evenly installed at equal intervals on the side end face of the simulation chamber corresponding to the positions of the simulators. The present invention improves the timeliness and effectiveness of the open circuit protection work, can recycle the unused energy during the power transmission process, greatly improves the energy-saving effect, and effectively improves the timeliness and effectiveness of the ventilation and heat exchange work. It can dynamically simulate the working states of the simulators under different external environmental temperatures and different ventilation and heat exchange conditions, greatly enhancing the diversity of the simulation operations, making the simulation work more rich and specific, and enhancing the authenticity and effectiveness of the simulation operations.

Description

Technical Field

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

[0002] In current power grids and traction power supply systems, due to the access of a large number of power electronic devices, the risks of power quality problems such as harmonic resonance, low-frequency oscillation, DC bias, and ferromagnetic resonance in the power system and railway traction power supply system increase. In severe cases, it will even affect the safe and stable operation of these systems. However, due to the limitations of the actual operating conditions and power supply situation of the railway and the power consumption mode of the power grid, it is relatively difficult to conduct research on power quality 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 them, the impedance analysis method is the mainstream analysis method. To obtain the actual impedance of the power supply system, small-signal harmonic current needs to be injected, and the amplitude and phase of the injected harmonic current need to be controllable, which requires the introduction of external devices;

[0003] In a test system, faults are inevitable. However, if simulation and diagnosis can be carried out before the occurrence of faults, 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 applicable to smart grids, with the application number: 201910152341.3. This distribution box protects the distribution box from ground pollutants and water, prevents the box door from being accidentally opened or closed during the work of workers, and increases safety;

[0004] However, the current distribution box cannot reasonably recycle the unused energy during the operation of the simulator, resulting in energy loss and waste, and the energy-saving effect is poor. At the same time, it cannot dynamically simulate the environmental temperature and ventilation and heat exchange state of the simulator, resulting in a single working environment for the simulator, so that the simulation results are one-sided, and the effectiveness and reliability of the simulation results are insufficient. Moreover, the overload protection 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 distribution box for a combined power supply simulator, which can effectively solve the problems of the current distribution box in the above-mentioned background technology, that is, it cannot reasonably recycle the unused energy during the operation of the simulator, resulting in energy loss and waste, and the energy-saving effect is poor. At the same time, it cannot dynamically simulate the environmental temperature and ventilation and heat exchange state of the simulator, resulting in a single working environment for the simulator, so that the simulation results are one-sided, and the effectiveness and reliability of the simulation results are insufficient. Moreover, the overload protection 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 object, the present invention provides the following technical solution: A distribution box for a combined power supply simulator, including a box body. On one side inside the box body, a simulation chamber is provided. On the other side inside the simulation chamber, a heat exchange chamber is arranged. A number of shelf plates are evenly installed at equal intervals inside the simulation chamber. On the top of the shelf plate, a simulator is installed. A protection simulation mechanism is installed outside the simulator;

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

[0008] A number of protective shells are evenly installed at equal intervals on the side end face of the simulation chamber corresponding to the position of the simulator. Inside the protective shell, a partition cylinder is installed. A number of inductance coils are evenly sleeved on the outer curved surface of the partition cylinder at equal intervals. At both ends of the partition cylinder, conductive rods are slidably installed. At one end of the conductive rod located inside the partition cylinder, a contact is installed. At the other end of the conductive rod, a terminal is installed. At the bottom of the protective shell, a strip box is installed;

[0009] At both ends of the strip box, sliding rods are embedded and installed. At one end of the sliding rod located inside the strip box, a plug is installed. In the middle of the top of the strip box, a conduit is installed. An airbag is installed on the side wall of the partition cylinder. At the edge of the side end face of the strip box, a flat tube is installed. In the middle of the bottom of the strip box, a right-angle tube is installed. A number of board boxes are evenly embedded and installed at equal intervals on the top of the shelf plate. On one side of the bottom of the strip box, a flat tube is installed. At the other end of the sliding rod, a sensor is embedded and installed.

[0010] Preferably, a number of outer shells are evenly installed at equal intervals on the side end face of the heat exchange chamber. Inside the cavity of the outer shell, a rotor is rotatably installed. Along the circumferential direction of the outer wall of the outer shell, a number of windings are embedded and installed at equal angles. On the inclined surface of the rotor corresponding to the position of the winding, a permanent magnet is installed. At one end of the outer shell, an impeller is embedded and rotatably installed. In the middle of the other end of the outer shell, a heating rod is installed. A coil is wound around the outer curved surface of the outer shell corresponding to the position of the heating rod. In the middle of the side end face of the outer shell, a switch is installed. On one side of the outer curved surface of the outer shell, a pipe body is installed. A gas 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 cavity of the partition cylinder. The space outside the contact in the cavity of the partition cylinder is in a vacuum state.

[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. The slidable 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 cavity of the strip box is communicated with the cavity of the airbag through the conduit. The cavity of the airbag is filled with helium. The space between the two plugs in the cavity of the strip box is connected with the cavity of the board box through the right-angle tube. The space outside the heating rod in the cavity of the outer shell is connected with the gas guide seat through the pipe body.

[0014] Preferably, the end of the slide bar is fixedly connected to the terminal. The slide bar is an insulating bar. The sensor is a temperature sensor. The inductance coil is connected to the switch through a winding. The winding is connected to the coil through the switch. The inputs of the sensor and the switch are connected to an external terminal.

[0015] Preferably, a maloperation protection mechanism is installed on one side of the protection simulation mechanism. The maloperation protection mechanism includes a diversion seat.

[0016] A connection chamber is arranged inside the box body at a position on one side of the heat exchange chamber. A diversion seat is installed on the side end face of the connection chamber corresponding to the simulation chamber. The end of the flat tube is communicated with the inner cavity of the diversion seat. A bent tube is installed on the top of the side end face of the diversion seat. An air storage tank is installed on the top of the connection chamber. A flat plug is slidably installed inside the air storage tank. A lead screw is rotatably installed by embedding on one side of the side end face of the air storage tank. A pressure gauge is embedded and installed on the other side of the side end face of the air storage tank.

[0017] A pipe group seat is installed outside the diversion seat. An insertion pipe is installed on the side end face of the pipe group seat corresponding to the right-angle pipe. A communicating pipe is installed in the middle of the other end face of the pipe group seat. A limiting box is installed at the end of the communicating pipe. A buffer box is installed at the bottom of the limiting box. An adjusting box is installed at the top of the limiting box. A horizontal plug plate is slidably installed inside the buffer box.

[0018] A horizontal plug plate is slidably installed inside the adjusting box. A screw rod is rotatably installed by embedding in the middle of the top of the adjusting box. Valves are embedded and installed in the middle of the side end face of the limiting box and at the bottom of one side end face of the buffer box respectively. A clamping connection pipe is installed at the end of the valve. A pressure gauge is embedded and installed at the bottom of the other side end face of the buffer box.

[0019] Preferably, helium is filled in the inner cavity of the air storage tank at a position between the pressure gauge and the flat plug. The space between the pressure gauge and the flat plug in the inner cavity of the air storage tank is communicated with the diversion seat through the bent tube. The lead screw is connected to the flat plug through a thread.

[0020] Preferably, the inner cavity of the pipe group seat is communicated with the right-angle pipe through the insertion pipe. The inner cavity volume of the air storage tank is the same as the inner cavity volume of the adjusting box. The screw rod is connected to the driving plug through a thread.

[0021] Preferably, the space at the bottom of the horizontal plug plate in the inner cavity of the buffer box and the inner cavity of the limiting box are both communicated with the clamping connection pipe through the valve. The space at the bottom of the driving plug in the inner cavity of the adjusting box is communicated with the end of the clamping connection pipe. The space at the bottom of the horizontal plug plate in the inner cavity of the buffer box and the space at the bottom of the driving plug in the inner cavity of the adjusting box are both filled with helium. The top of the inner cavity of the limiting box is directly communicated with the bottom of the inner cavity of the buffer box.

[0022] Preferably, a power simulator, according to the power simulator in a combined power supply simulator used distribution box, includes 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, S7, and is used to control the working mode switching of the power simulator;

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

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

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: The structure of the present invention is scientific and reasonable, and it is safe and convenient to use;

[0027] 1. A protection simulation mechanism is provided. Through the cooperation of a protective shell, a separating cylinder, a conductive rod, a contact head and a terminal, an auxiliary wiring structure can be constructed, effectively improving the convenience and stability of line on-off, effectively strengthening the compatibility and connection stability between simulation operations and safety protection work during the simulation operation. With a strip box, a sliding rod, a plug, a conduit, an airbag, a flat tube, a plate box and a flat tube, an elastic on-off structure can be formed. On the one hand, it can achieve elastic locking at the joint during normal simulation operations, making the connection stress at the joint rise and fall synchronously with the simulated load pressure, greatly improving the stability and reliability of the connection at the joint, making the power transmission more stable and efficient, and effectively strengthening the smoothness of the simulation operation. On the other hand, it can achieve dual temperature measurement and control of the joint and the simulation chamber during the simulation operation, effectively converting the heat during power transmission into driving force, quickly and efficiently realizing elastic open-circuit protection when the simulator is overloaded, greatly improving the timeliness and reliability of the open-circuit protection work, and effectively solving the problem that the simulator and the distribution box are damaged due to the overload of the simulator output.

[0028] 2. By combining a conductive rod, a contact, a terminal, an inductor coil, a housing, a rotor, a permanent magnet, a winding, and an impeller, an electromagnetic conversion structure can be constructed to convert and utilize the electromagnetic energy during the simulation operation, realizing the recycling of the unused energy during the power transmission process, converting electromagnetic energy into driving force, not only effectively improving the energy utilization efficiency during the simulation operation, achieving ventilation and heat exchange without external energy sources, greatly enhancing the energy-saving effect, but also effectively improving the timeliness and effectiveness of the ventilation and heat exchange work. With the dynamic temperature regulation function of a heating rod, a coil, a switch, a pipe body, a gas guide seat, a right-angle pipe, and a sensor, the unused energy during the power transmission process can be further converted into a power source to dynamically regulate the working environment temperature of the simulator, forming a dynamic environment simulation structure, which can dynamically simulate the working states of the simulator under different external environmental temperatures and different ventilation and heat exchange conditions, greatly enhancing the diversity of the simulation operation, making the simulation work more rich and specific, and enhancing the real effectiveness of the simulation operation.

[0029] 3. A misoperation protection mechanism is set. By combining a diversion seat, an elbow pipe, a gas storage tank, a flat plug, a lead screw, and a pressure gauge, a pressure-limiting protection structure can be constructed to dynamically limit the load threshold of the simulator during the simulation operation according to actual needs, not only effectively enhancing the safety and stability during the simulator operation, but also enriching the flexibility and variability of the simulation operation, enabling the simulation operation to adapt to different simulation threshold requirements, effectively expanding the adaptation range of the simulation operation. With a limit box, a buffer box, an adjustment box, a horizontal plug plate, a driving plug, a screw rod, and a pressure gauge, the working state of the simulation operation can be dynamically divided, equivalently realizing the synchronous detection of the working state of the simulator, greatly enhancing the stability and reliability of the simulator operation;

[0030] With the current-limiting and conveying function of a pipe group seat, an insertion pipe, a connecting pipe, a valve, and a clamping connecting pipe, on the one hand, the synchronous on-off adjustment of each joint can be quickly realized, greatly improving the efficiency, reliability, and convenience of the circuit on-off work, making the simulation work safer. On the other hand, the normal state, high-load state, and overload state of the simulator operation can be accurately distinguished, effectively avoiding the misoperation of the circuit breaker protection work during the simulation process, resulting in the circuit being cut off and affecting the continuity of the simulation operation. At the same time, the overload protection work can be made more balanced, smooth, efficient, synchronous, and timely, improving the effectiveness of the overload protection while ensuring the continuity of the simulation operation.

[0031] In summary, the present distribution box can effectively utilize the heat energy generated during the simulation operation by the simulator, and can recycle the energy that is not utilized during the power transmission process, greatly improving the effective utilization rate of energy, achieving real-time overload protection for the simulation operation, and can dynamically simulate the working environment temperature and ventilation and heat exchange state of the simulator, effectively enhancing the richness, diversity, authenticity and effectiveness of the simulation operation. At the same time, it can effectively avoid the mis-triggering of the open-circuit protection work, making the open-circuit protection work more accurate, smoother, more stable and more efficient while ensuring the continuity of the simulation operation.

[0032] 4. The power simulator of the present invention can simulate single-phase traction power supply systems and three-phase power systems, meeting the test requirements of different power systems. By using a multi-winding transformer and a modular H-bridge converter, it can flexibly configure the output voltage and power to adapt to different voltage level requirements, and supports the simulation of complex power environments such as harmonics, low-frequency oscillations, and DC bias magnetic fields. It is applicable to the research during the service period of high-voltage equipment to ensure the stability and safety of the system, and can also be applicable to the equipment testing in the electric traction power supply system, such as the high-voltage test of lightning arresters and the impedance test of other power electronic equipment. This method only requires a single-phase power supply, that is, using the single-phase traction network as the power supply, with controllable output and flexible control. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The 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, but do not constitute a limitation to the present invention. In the drawings:

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

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

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

[0037] Figure 4 is a schematic structural diagram of the protective simulation mechanism of the present invention;

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

[0039] Figure 6 is a partial explosion diagram of the protective simulation mechanism of the present invention;

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

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

[0042] Figure 9 It is a schematic diagram of the driving plug installation structure of the present invention;

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

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

[0045] 200, misoperation protection mechanism; 201, protective shell; 202, partition cylinder; 203, inductance coil; 204, conductive rod; 205, contact; 206, terminal; 207, strip box; 208, sliding rod; 209, plug head; 210, conduit; 211, airbag; 212, flat tube; 213, outer shell; 214, rotor; 2141, permanent magnet; 215, winding; 216, impeller; 217, heating rod; 218, coil; 219, switch; 220, pipe body; 221, air guide seat; 222, right-angle pipe; 223, board box; 224, flat tube; 225, sensor;

[0046] 300, misoperation protection mechanism; 301, diversion seat; 302, elbow pipe; 303, gas storage tank; 304, flat plug; 305, lead screw; 306, pressure gauge; 307, pipe group seat; 308, insertion pipe; 309, connecting pipe; 310, limit box; 311, buffer box; 312, adjustment box; 313, horizontal plug board; 314, driving plug; 315, screw; 316, valve; 317, clamping connection pipe; 318, pressure gauge. Specific embodiments

[0047] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0048] Embodiment 1:

[0049] As Figure 1-9 shown, the present invention provides a technical solution, a combined power supply simulator distribution box, including a box body 100, a simulation chamber 101 is opened on one side inside the box body 100, a heat exchange chamber 102 is arranged on the other side inside the simulation chamber 101, a plurality of shelf boards 103 are equidistantly and uniformly installed inside the simulation chamber 101, a simulator 104 is installed on the top of the shelf board 103, and a misoperation protection mechanism 200 is installed outside the simulator 104;

[0050] The protection simulation mechanism 200 includes a protective shell 201, a spacer cylinder 202, an inductor coil 203, a conductive rod 204, a contact 205, a terminal 206, a strip box 207, a slide rod 208, a plug 209, a conduit 210, an airbag 211, a flat tube 212, an outer shell 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, a gas guide seat 221, a right-angle tube 222, a plate box 223, a flat tube 224, and a sensor 225;

[0051] A number of protective shells 201 are equidistantly and uniformly installed on the side end face of the simulation chamber 101 corresponding to the position of the simulator 104. An inductor coil 203 is equidistantly and uniformly sleeved on the outer curved surface of the spacer cylinder 202 installed inside the protective shell 201. Conductive rods 204 are slidably installed at both ends of the spacer cylinder 202. A contact 205 is installed at one end of the conductive rod 204 located inside the spacer cylinder 202. The outer diameter of the contact 205 is smaller than the inner diameter of the inner cavity of the spacer cylinder 202. The inner cavity of the spacer cylinder 202 is in a vacuum state outside the contact 205 to control the on / off of the circuit and extinguish the arc. A terminal 206 is installed at the other end of the conductive rod 204. A strip box 207 is installed at the bottom end of the protective shell 201;

[0052] Slide rods 208 are embedded and slidably installed at both ends of the strip box 207. A plug 209 is installed at one end of the slide rod 208 located inside the strip box 207. A conduit 210 is installed in the middle of the top end of the strip box 207. An airbag 211 is installed on the side wall of the spacer cylinder 202. A flat tube 212 is installed at the edge of the side end face of the strip box 207. The sum of the length of the slide 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. The slidable distance of the contact 205 is smaller than the distance between the plug 209 and the end of the flat tube 212 to achieve circuit protection;

[0053] A right-angle tube 222 is installed in the middle of the bottom end of the strip box 207. A number of plate boxes 223 are equidistantly and uniformly embedded and installed at the top end of the support plate 103. The space between the two plugs 209 in the inner cavity of the strip box 207 is communicated with the inner cavity of the airbag 211 through the conduit 210. The inner cavity of the airbag 211 is filled with helium. The space between the two plugs 209 in the inner cavity of the strip box 207 is connected to the inner cavity of the plate box 223 through the right-angle tube 222. The space outside the heating rod 217 in the inner cavity of the outer shell 213 is connected to the gas guide seat 221 through the tube body 220 to improve the flow stability of the driving medium;

[0054] One side of the bottom end of the strip box 207 is installed with a flat tube 224. The other end of the sliding rod 208 is embedded with a sensor 225. The end of the sliding rod 208 is fixedly connected to the terminal 206. The sliding rod 208 is an insulating rod, the sensor 225 is a temperature sensor, the inductance coil 203 is connected to the switch 219 through the winding 215, the winding 215 is connected to the coil 218 through the switch 219, and 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 outer shells 213 are equidistantly and evenly installed on the side end face of the heat exchange chamber 102. A rotor 214 is rotatably installed in the inner cavity of the outer shell 213. A number of windings 215 are embedded and installed on the outer wall of the outer shell 213 at equal angles along the circumferential direction. A permanent magnet 2141 is installed at the position of the inclined plane of the rotor 214 corresponding to the winding 215. One end of the outer shell 213 is embedded and rotatably installed with an impeller 216. In the middle of the other end of the outer shell 213, a heating rod 217 is installed. A coil 218 is wound around the outer curved surface of the outer shell 213 at the position corresponding to the heating rod 217. A switch 219 is installed in the middle of the side end face of the outer shell 213. A tube body 220 is installed on one side of the outer curved surface of the outer shell 213. A gas 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. The malfunction protection mechanism 300 includes a diversion seat 301, a bent pipe 302, a gas storage tank 303, a flat plug 304, a lead screw 305, a pressure gauge 306, a pipe group seat 307, an insertion pipe 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 connecting pipe 317 and a pressure gauge 318;

[0057] A connection chamber 105 is arranged inside the box body 100 at the position on one side of the heat exchange chamber 102. A diversion seat 301 is installed on the side end face of the connection chamber 105 corresponding to the simulation chamber 101, and the end of the flat tube 224 is communicated with the inner cavity of the diversion seat 301. A bent pipe 302 is installed at the top of the side end face of the diversion seat 301. A gas storage tank 303 is installed on the top of the connection chamber 105. A flat plug 304 is slidably installed inside the gas storage tank 303. A lead screw 305 is embedded and rotatably installed on one side of the side end face of the gas storage tank 303. A pressure gauge 306 is embedded and installed on the other side of the side end face of the gas storage tank 303. Helium is filled in the inner cavity of the gas storage tank 303 at the position between the pressure gauge 306 and the flat plug 304, and the space between the pressure gauge 306 and the flat plug 304 in the inner cavity of the gas storage tank 303 is communicated with the diversion seat 301 through the bent pipe 302. The lead screw 305 is connected to the flat plug 304 through a thread to limit the safety threshold;

[0058] A pipe group seat 307 is installed outside the diversion seat 301. An insertion pipe 308 is installed at the side end face of the pipe group seat 307 corresponding to the position of the right-angle pipe 222. A connecting pipe 309 is installed in the middle of the other side end face of the pipe group seat 307. A limiting box 310 is installed at the end of the connecting pipe 309. A buffer box 311 is installed at the bottom of the limiting box 310. An adjusting box 312 is installed at the top of the limiting 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 adjusting box 312. A screw rod 315 is rotatably installed by embedding in the middle of the top of the adjusting box 312. The inner cavity of the pipe group seat 307 is communicated with the right-angle pipe 222 through the insertion pipe 308. The inner cavity volume of the gas storage tank 303 is the same as the inner cavity volume of the adjusting box 312. The screw rod 315 is connected to the driving plug 314 through a thread to maintain the stable on-off of the load. A valve 316 is embedded and installed in the middle of the side end face of the limiting box 310 and at the bottom of one side end face of the buffer box 311. The space at the bottom of the horizontal plug plate 313 inside the buffer box 311 and the inner cavity of the limiting box 310 are both communicated with the clamping pipe 317 through the valve 316. And the space at the bottom of the driving plug 314 inside the adjusting box 312 is communicated with the end of the clamping pipe 317. The space at the bottom of the horizontal plug plate 313 inside the buffer box 311 and the space at the bottom of the driving plug 314 inside the adjusting box 312 are both filled with helium. The top of the inner cavity of the limiting box 310 is directly communicated with the bottom of the inner cavity of the buffer box 311 to avoid mis-triggering of the open-circuit protection work. A clamping pipe 317 is installed at the end of the valve 316. A pressure gauge 318 is embedded and installed at the bottom of the other side end face of the buffer box 311.

[0060] The working principle and usage process of the present invention: During the actual use of this distribution box, first, the box body 100 is stably placed in the working area to be worked. Open the box body 100, open the valve 316 corresponding to the limiting box 310, rotate the screw rod 315 to drive the helium gas at the bottom of the driving plug 314 to be pressed into the limiting box 310 through the clamping pipe 317. Subsequently, the helium gas will enter the pipe group seat 307 through the connecting pipe 309, and under the connection of the insertion pipe 308, enter each strip box 207 through the right-angle pipe 222, pressing the plug head 209, forcing the two plug heads 209 inside the same strip box 207 to move away from each other under the air pressure, and driving the terminal 206 to move synchronously through the slide rod 208. Furthermore, the two contact heads 205 inside the same partition cylinder 202 are separated under the drive of the conductive rod 204, cutting off the connection between each contact head 205;

[0061] During the above process, as each plug 209 moves, it squeezes the helium gas inside the strip box 207 outside the slide bar 208, forcing it to enter the diversion seat 301 through the flat tube 224 and enter the gas storage tank 303 through the elbow 302, forcing the internal air pressure of the gas storage tank 303 to rise. During the above adjustment process, the adjustment progress can be controlled according to the reading of the pressure gauge 306. When the reading of the pressure gauge 306 rises, it indicates that each plug 209 has slid correspondingly and the contacts 205 have separated. Subsequently, the simulator 104 can be installed in the simulation chamber 101, and corresponding wiring work can be carried out according to actual needs, and the simulator 104 can be connected to the corresponding external test circuit through each terminal 206;

[0062] After completing the connection work, normal simulation operations can be carried out. At this time, rotate the lead screw 305 to drive the displacement of the flat plug 304, press the helium gas inside the gas storage tank 303 into the diversion seat 301 through the elbow 302, and under the conduction of the flat tube 224, fill the helium gas into the gap outside the slide bar 208 in the inner cavity of each strip box 207, forcing each plug 209 to move towards each other, and making the corresponding terminals 206 move synchronously under the drive of the slide bar 208, so that the two contacts 205 inside each partition cylinder 202 are abutted under the drive of the conductive rod 204, connecting the connection between the simulator 104 and the corresponding external test circuit;

[0063] Here, the end face where each plug 209 is connected to the slide bar 208 is taken as the outer end face. At this time, the air pressure received by the outer end face of each plug 209 can be adjusted according to the reading of the pressure gauge 306. From the above adjustment, it can be known that under this air pressure, the two contacts 205 inside each partition cylinder 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 cylinder 202. This air pressure is the connection air pressure;

[0064] During 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. Rotate the screw 315 to press the helium gas inside the adjustment box 312 into the buffer box 311 through the clamping pipe 317, forcing the horizontal plug plate 313 to closely fit the end face of the limit box 310 under the action of air pressure. The air pressure received by the bottom of the horizontal plug plate 313 can be limited according to the reading of the pressure gauge 318. This 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 received by the inner end face of each plug 209, so that the two contacts 205 inside each partition cylinder 202 maintain a trend of moving towards each other during normal operation, enter the pre-disconnection state during high-load operation, and automatically open the circuit during overload;

[0065] During the simulation operation process, as the simulation operation progresses, heat is dissipated at the contact 205, causing the temperature inside the partition cylinder 202 to rise. The air pressure inside the airbag 211 also rises synchronously with the temperature, forcing the helium gas inside the airbag 211 to enter the barrel 207 through the conduit 210 under the action of air pressure and squeeze the inner end face of the plug 209. At the same time, as the simulation operation progresses, the simulator 104 also generates heat accordingly, causing the temperature inside the heat exchange chamber 102 to rise. The air pressure inside each board box 223 also rises synchronously with the temperature, forcing the air inside the board box 223 to enter the barrel 207 through the right-angle pipe 222 under the action of air pressure and squeeze the inner end face of the plug 209, resulting in an increase in the air pressure received by the inner end face of the plug 209;

[0066] When the air pressure received by the inner end face of each plug 209 is less than the buffer air pressure, it is not sufficient to overcome the air pressure received by the outer end face of the plug 209 and push the plug 209 to move. The helium gas inside the barrel 207 located between the two plugs 209 will be pressed into the limit box 310 under the action of air pressure. At this time, the air pressure received by the inner end face of each plug 209 is in a normal state;

[0067] When the air pressure received by the inner end face of each plug 209 is greater than the buffer air pressure and less than the connection air pressure, the horizontal plug plate 313 will descend under the extrusion of this air pressure. The horizontal plug plate 313 will press the bottom air pressure to buffer and dilute the air pressure received by its top, maintaining the stability of the air pressure received by the inner end face of each plug 209. At this time, the air pressure received by the inner end face of each plug 209 is in a high-load state, and the connection between the contacts 205 enters a pre-disconnection state. When the air pressure received by the inner end face of each plug 209 is greater than the connection air pressure, at this time, the air pressure received by the inner end face of each plug 209 is in an overload state, and each plug 209 will move away from each other under the action of air pressure;

[0068] In the above process, the air pressure received by 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 change at the contact 205 and the temperature change inside the simulation chamber 101 in turn correspond to the load state of the simulator 104. Furthermore, by restricting the air pressure received by the inner end face of the plug 209, the load state of the simulator 104 can be restricted;

[0069] Furthermore, the normal working state, high-load working state, and overload working state of the simulator 104 can be distinguished. When the simulator 104 is overloaded, that is, when the air pressure received by 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 between the normal working state and the overload state to avoid misoperation of the contact 205 during the simulation operation, resulting in the circuit being cut off and affecting the continuity of the test. That is, by adjusting the magnitudes of the buffer air pressure and the connection air pressure, the normal, high-load, and overload ranges of the air pressure received by the inner end face of the plug 209 can be delimited to accurately control the on-off of the contact 205;

[0070] Similarly, during the simulation operation process, as the current flows through the conductive rod 204 and the contact 205, an induced current will be generated at the inductance coil 203. Cooperating with the winding 215 and the coil 218, corresponding magnetic fields can be generated 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 eddy currents generated inside. At the same time, the impeller 216 will rotate synchronously under the drive of the rotor 214, pressing the external air into the housing 213. Subsequently, when the air flow passes through the external space of the heating rod 217, it is heated into a hot air flow;

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

[0072] Embodiment 2:

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

[0074] The high-voltage sides of three groups of single-phase multi-winding transformers are respectively connected to the power grid through switch circuit breakers. The high-voltage side voltage 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 a single-phase AC power with controllable amplitude and frequency is output through an inversion link. The output AC power can output a single-phase AC voltage of 0 - 33 kV or a three-phase AC voltage of 0 - 11 kV through a switch circuit;

[0075] The single-phase multi-winding transformer converts three-phase alternating current into single-phase alternating current energy through a single-phase H-bridge AC-DC-AC converter. Based on the cascading of single-phase AC-DC-AC converters, by controlling the switch circuit, the conversion of the output voltage between three-phase alternating current and single-phase alternating current can be achieved. The specific implementation method is as follows: when switches S1, S2, and S3 are closed and switches S4, S5, S6, and S7 are open, the AC output sides of the single-phase H-bridge AC-DC-AC converters connected to the three single-winding transformers are cascaded with each other, and single-phase alternating current with controllable amplitude, phase, and frequency can be output between ad. The amplitude range of the output single-phase alternating voltage is 0 - 33 kV, which can be used as an analog power source. The output alternating voltage can be applied to the lightning arrester installed on the roof of the electric locomotive and the line lightning arrester for withstand voltage tests, and the roof lightning arrester and line lightning arrester installed in the railway traction high-voltage equipment system are studied to understand their performance, life, and reliability during service, that is, during the actual operation and use process. At the same time, by controlling the single-phase H-bridge AC-DC-AC converter, the AC-DC-AC converter can output single-phase alternating voltage with controllable amplitude, phase, and frequency. In this solution, harmonics in the range of 0 - 5050 Hz can be generated, and the amplitude of the generated harmonics can reach 5 kV. By superimposing the generated harmonic signal on the fundamental voltage, the power supply environments such as harmonic resonance, low-frequency oscillation, DC bias, and ferromagnetic resonance in the traction power supply system can be simulated to simulate various power quality problems that may be encountered in the railway traction power supply system. At the same time, this solution 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 the stability analysis of the traction power supply system.

[0076] Embodiment 3:

[0077] As Figure 10 shown, a power supply simulator is used for simulating the power supply of a three-phase 10 kV power grid;

[0078] The high-voltage sides of three groups of single-phase multi-winding transformers are respectively connected to the power grid through switch circuit breakers. The high-voltage side voltage 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 alternating voltage is converted into direct current through a rectifier and then outputs single-phase alternating current energy with controllable amplitude and frequency through an inversion link. The output alternating current energy can output a single-phase alternating voltage of 0 - 33 kV or a three-phase alternating voltage of 0 - 11 kV through a switch circuit;

[0079] When switches S1, S2, and S3 are disconnected and switches S4, S5, S6, and S7 are closed, the alternating current output by the AC-DC-AC converter combines through three single-phase multi-winding transformers to output three-phase alternating current. The output amplitude range of the three-phase alternating current is 0 - 11 kV, which can be used as a three-phase 10 kV power source simulator to simulate power quality problems 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 a three-phase power system with a power rating of 600 kW. This mode is mainly used to study related issues in a three-phase power system, such as complex power grid environments like power fluctuations, voltage imbalance, and three-phase short circuits. Through the coordinated operation of multiple H-bridge converters, the power source simulator can accurately simulate the dynamic characteristics in a three-phase power system.

[0080] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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 shelves (103) are evenly and equidistantly installed inside the simulation chamber (101), a simulator (104) is installed on the top of the shelf (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 slide rods (208) for sliding installation, one end of the slide rod (208) is installed with a plug (209) at a position inside the strip box (207), 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 edge of the side end surface 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 slide rod (208); 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 on the inclined surface of the rotor (214) at a position corresponding to the winding (215); 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).

2. A combined power distribution box for a power supply simulator according to claim 1, 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).

3. A combined power distribution box for a power supply simulator according to claim 1, 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).

4. A combined power distribution box for a power supply simulator according to claim 1, 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.

5. The combined power distribution box for a power supply simulator according to claim 1, 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 tube (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 a position of a side end surface of the tube assembly seat (307) corresponding to the right-angle tube (222); a connecting pipe (309) is installed in the middle of the other 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 mounted 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 in the bottom of one end surface of the buffer box (311), a clamping tube (317) is mounted on 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).

6. A combined power distribution box for a power supply simulator according to claim 5, 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 the bent pipe (302), and the screw rod (305) is connected to the flat plug (304) through a thread.

7. A combined power distribution box for a power supply simulator according to claim 5, characterized in that: The inner cavity of the tube assembly seat (307) is connected to the right-angle tube (222) via 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) via a thread.

8. The combined power distribution box for a power supply simulator according to claim 5, 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).

9. A power simulator, characterized in that: The simulator is a power simulator in a distribution box for a combined power supply simulator according to any one of claims 1 to 8, 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, S3 are closed, and switches S4, S5, S6, and S7 are open, the power simulator can be used as a single-phase 25kV traction power simulator to inject harmonic disturbances into the traction power system. The injected harmonic disturbances can reach 5kV. This notifies the power simulator to support the service research of high-voltage equipment on the roof and line lightning arresters. It 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 serve 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 the research of 600kW power level three-phase power system problems.

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