Instrument capable of realizing excitation test of synchronous motor in explosion-proof area

Abstract

The invention relates to the technical field of synchronous motors, in particular to an instrument capable of realizing an excitation test of a synchronous motor in an explosion-proof area. The instrument comprises a power box, an air switch QF, an alternating-current contactor KM, a solid-state voltage regulator SCR and a comprehensive protector are arranged in the power box, the upper end of the air switch QF is connected with an external power source, the lower end of the air switch QF is connected with the upper end of the alternating-current contactor KM, the lower end of the alternating-current contactor KM is connected with the upper ends of a fuse RTOA, a fuse RTOB and a fuse RTOC, and the fuse RTOA, the fuse RTOB and the fuse RTOC are connected with the comprehensive protector. And the lower ends of the fuse RTOA, the fuse RTOB and the fuse RTOC are connected with the upper end of the solid-state voltage regulator SCR. According to the invention, required test equipment is intensively designed in one power box, the test requirements are met, meanwhile, the power box can be moved at will, can climb stairs, is more convenient to carry, is faster, safer and more convenient to connect and disconnect lines during the test, improves the test efficiency, and is suitable for the electrical test function of an explosion-proof area.

Description

Technical field:

[0001] The invention relates to the technical field of synchronous motors, and in particular to an instrument capable of realizing excitation test of synchronous motors in explosion-proof areas. Background technology:

[0002] In petrochemical enterprises, synchronous machine excitation systems mostly use brushless excitation, which has the advantages of no spark, good explosion-proof performance, and maintenance-free, and is widely used in various enterprises. Since synchronous machines mostly drive loads such as compressors, the medium in the compressor is mostly hydrogen, and the operating environment is mostly in explosion-proof areas.

[0003] The rotating exciter is installed in the production unit area and placed inside the motor cavity. Its operating status cannot be checked regularly, and there are few proactive maintenance items that can be taken. It can only be checked during unit maintenance or device maintenance. The installed rotating excitation system has a high failure rate, a long operating cycle, far-reaching failure impacts, and hidden failures. As special care equipment, the synchronous motors of various petrochemical companies face the risk of severe fluctuations and shutdowns once a failure occurs, which plays a vital role in the production and operation of the device.

[0004] There are two existing inspection methods: one is a minor repair test; the other is an overhaul test. The minor repair test can test the volt-ampere characteristics of the internal diode and thyristor of the rotating excitation, the demagnetization resistor, and the insulation resistance of the excitation winding to the ground. However, it is impossible to test the working status of the controller. The overhaul test can solve the above problems, but the overhaul test requires more test instruments, a total of 9 pieces. The test instruments need to be rewired and the equipment debugged. Each test time is no less than 3 hours. During the unit maintenance, other units are in operation. The maintenance area is an explosion-proof area. All overhaul test instruments are non-explosion-proof equipment. Maintenance in the hydrogen area poses a great risk.

[0005] In order to ensure the integrity of the rotating part of the synchronous machine, it is stipulated that the rotating excitation of the synchronous machine should be tested before the first power supply and during the overhaul of the unit. The electrical equipment required for the test is: 1 three-phase voltage regulator, 1 oscilloscope, 1 line-type air switch, 2 incandescent lamps, and 1 diode. Each test requires the transportation of heavy and diverse electrical equipment and instruments, which requires long-distance transportation and transportation up and down stairs; the second is repeated wiring. Each test must be carried out according to the schematic diagram. The same wiring affects work efficiency. It takes 3 hours from carrying equipment to wiring to the final test, and 4 people are required.

[0006] The existing synchronous machine brushless rotating excitation system test scheme has the following problems:

[0007] ① The test of the synchronous motor's rotating excitation system is carried out through simple testing with a multimeter and a megohmmeter. The detection technology is backward and it is difficult to find deep hidden dangers;

[0008] ② The comprehensive overhaul test process is complicated, requiring the coordination of 9 test instruments and the connection of 26 external wires. Each test instrument needs to be debugged many times, and the coordination between the instruments is not smooth, wasting a lot of time;

[0009] ③ The on-site test instruments do not meet the explosion-proof requirements. During the operation of the device, the maintenance site is mostly near hydrogen. The external wiring of the instrument is loose and the internal spark of the instrument may cause discharge, posing a risk of fire and explosion;

[0010] ④ The existing test instruments are bulky, with up to 9 test instruments working together. The workload of loading and unloading the instruments and moving up and down stairs is heavy, especially the voltage regulator weighs about 50kg, and all the instruments weigh about 100kg.

[0011] ⑤ The existing test instruments have incomplete protection. Due to wiring errors, load failures and other reasons, the test instruments often shut down due to overload, short circuit, heat and other factors. Summary of the invention:

[0012] The technical problem to be solved by the present invention is to provide an instrument that can realize the excitation test of a synchronous motor in an explosion-proof area. The instrument realizes the centralized design of the required test equipment in a power box. While meeting the test requirements, the instrument can be moved arbitrarily, can climb stairs, and is more convenient to carry. During the test, connecting and disconnecting the lines is faster, safer and more convenient, thereby improving the test efficiency and being suitable for electrical test functions in explosion-proof areas.

[0013] The technical solution adopted by the present invention is: an instrument capable of realizing excitation test of synchronous motor in explosion-proof area, comprising a power box; an air switch QF, an AC contactor KM, a solid-state voltage regulator SCR, and a comprehensive protector are arranged in the power box, the upper end of the air switch QF is connected to an external power supply, the lower end of the air switch QF is connected to the upper end of the AC contactor KM, the lower end of the AC contactor KM is connected to the upper ends of fuses RTOA, RTOB, and RTOC, the lower ends of fuses RTOA, RTOB, and RTOC are connected to the upper end of the solid-state voltage regulator SCR, the lower end of the solid-state voltage regulator SCR is respectively connected to the upper ends of current transformers TA1, TA2, and TA3, wherein the connection lines of the solid-state voltage regulator SCR and the current transformers TA1, TA2, and TA3 pass through the current transformer CT of the comprehensive protector;

[0014] The lower terminals L11, L12, and L13 of the air switch QF are connected to the upper ends of fuses FU3, FU4, and FU5 respectively, and the lower ends of fuses FU3, FU4, and FU5 are connected to the input end of the conversion switch SA2, and the output end of the conversion switch SA2 is connected to the output voltmeter PV1;

[0015] The lower end of the solid-state voltage regulator SCR is connected to the upper ends of fuses FU6, FU7 and FU8, the lower ends of fuses FU6, FU7 and FU8 are connected to the DC busbar voltmeter PV2, and the lower ends of fuses FU6, FU7 and FU8 are connected to the input end of the conversion switch SA2;

[0016] The external power supply is a power supply L11, a fuse FU2, an auxiliary contact of an AC contactor KM, a heat sink FJ2 on a solid-state voltage regulator SCR, and a power supply N connected in series in sequence;

[0017] The external power supply is a power supply L11, a fuse FU1, an emergency stop switch SB0, a contactor contact of a comprehensive protector, and a stop voltage regulating button 1SB1, which are connected in series in sequence. After the start voltage regulating button 1SB2 is connected in parallel with an auxiliary contact of the AC contactor KM, the upper end is connected to the lower end of the stop voltage regulating button 1SB1, and the lower end is connected to the upper end of the AC contactor KM coil, and the AC contactor KM coil is connected to the power supply N;

[0018] The lower end of the emergency stop switch SB0, the auxiliary contact of the AC contactor KM, the operation indicator light HR1, and the power supply N are connected in series in sequence; the lower end of the emergency stop switch SB0, the auxiliary contact of the AC contactor KM, the stop indicator light HG1, and the power supply N are connected in series in sequence; after the solid-state voltage regulator SCR is connected in parallel with the protection action contact of the comprehensive protector, the upper end is connected to the lower end of the emergency stop switch SB0, and the lower end is connected to the upper end of the fault indicator light HY1, and the fault indicator light HY1 is connected to the power supply N; the lower end of the emergency stop switch SB0, the circuit breaker contact of the comprehensive protector, the auxiliary contact of the air switch QF, the shunt coil of the air switch QF, and the power supply N are connected in series in sequence;

[0019] The timer T power supply, output voltmeter PV1, DC busbar voltmeter PV2, oscilloscope SBQ power supply, and output ammeter PA are connected in parallel, and the upper end is connected to the emergency stop switch SB0, and the lower end is connected to the power supply N; the lower end of the emergency stop switch SB0, the conversion switch SA1, the timer T normally closed contact, the relay KA1, and the power supply N are connected in series in sequence;

[0020] The two ends of the excitation winding indicator light BD1 are respectively connected to the lead wires of the excitation lamp-1 and the excitation lamp-2, and the two ends of the demagnetization winding indicator light BD2 are respectively connected to the lead wires of the demagnetization lamp-1 and the demagnetization lamp-2; the two ends of the fuse RTO are respectively connected to the air switch QF2 and the diode VD, the air switch QF2 is connected to the anode lead wire of the diode, and the diode VD is connected to the cathode lead wire of the diode.

[0021] Furthermore, the integrated protector adopts the integrated protector MMPR-220 / T.

[0022] Furthermore, during the test, the external circuits required for the power box are all designed as explosion-proof plug connectors.

[0023] Furthermore, the power box requires external circuits including power supplies U, V, W, diode anode, diode cathode, excitation lamp-1, excitation lamp-2, demagnetization lamp-1, demagnetization lamp-2, DC voltage-1, DC voltage-2, timing node-1, timing node-2, oscilloscope-1, and oscilloscope-2 wiring terminals. All of the above wiring terminals are designed as explosion-proof plug connectors and are arranged in sequence from top to bottom on the side of the power box body.

[0024] Furthermore, the solid-state voltage regulator SCR adopts a solid-state voltage regulator of model SCR-3-H380-150A, which is equipped with a radiator, a fan, and a sliding resistor. The fan is installed on the lower side of the AC contactor KM, and vents are installed on both sides of the lower part of the power box body.

[0025] Furthermore, the power box is externally provided with a pull rod that can be pulled out.

[0026] Furthermore, a roller is arranged at the bottom of the power box, and the roller can be removed outside the box.

[0027] Furthermore, the integrated protector, timer T, oscilloscope SBQ, output voltmeter PV1, DC busbar voltmeter PV2, and output ammeter PA are all placed on the front of the power box body, and a visual window is installed at a corresponding position of the power box body shell.

[0028] The beneficial effects of the present invention are:

[0029] 1. The required test equipment is centrally designed in a power box, and a fast and convenient wiring method is adopted;

[0030] 2. The power box is equipped with a pull-out rod and rollers at the bottom, which can be moved at will and climb stairs, making it more convenient to carry and transport.

[0031] 3. It is faster, safer and more convenient to connect and disconnect the circuits during the test, thus improving the test efficiency;

[0032] 4. The electrical test function is suitable for explosion-proof areas. It can complete the in-depth inspection of the synchronous machine rotating excitation unit during the operation of the device and find potential defects. Description of the drawings:

[0033] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Figure 1 This is a primary wiring schematic diagram of the present invention.

[0035] Figure 2It is a schematic diagram of the secondary wiring of the present invention.

[0036] Figure 3 This is the wiring diagram of the integrated protector.

[0037] Figure 4 This is the wiring diagram of timer T.

[0038] Figure 5 This is the front view of the power box.

[0039] Figure 6 This is a side view of the power box.

[0040] Figure 7 This is the internal wiring diagram of the rotating exciter.

[0041] Figure 8 This is the wiring diagram for the simulated excitation test.

[0042] Fig. 9 This is the DC bus waveform of the oscilloscope.

[0043] Fig.10 This is the wiring diagram for the simulated demagnetization test.

[0044] Fig.11 This is the oscilloscope rectifier bridge waveform. Specific implementation method:

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, an instrument capable of realizing excitation test of synchronous motor in explosion-proof area comprises a power box; an air switch QF, an AC contactor KM, a solid-state voltage regulator SCR, and a comprehensive protector are arranged in the power box, the upper end of the air switch QF is connected to an external power supply, the lower end of the air switch QF is connected to the upper end of the AC contactor KM, the lower end of the AC contactor KM is connected to the upper ends of fuses RTOA, RTOB, and RTOC, the lower ends of fuses RTOA, RTOB, and RTOC are connected to the upper end of the solid-state voltage regulator SCR, the lower end of the solid-state voltage regulator SCR is connected to the upper ends of current transformers TA1, TA2, and TA3, respectively, wherein the connection lines between the solid-state voltage regulator SCR and the current transformers TA1, TA2, and TA3 pass through the current transformer CT of the comprehensive protector;

[0046] The lower terminals L11, L12, and L13 of the air switch QF are connected to the upper ends of fuses FU3, FU4, and FU5 respectively, and the lower ends of fuses FU3, FU4, and FU5 are connected to the input end of the conversion switch SA2, and the output end of the conversion switch SA2 is connected to the output voltmeter PV1;

[0047] The lower end of the solid-state voltage regulator SCR is connected to the upper ends of fuses FU6, FU7 and FU8, the lower ends of fuses FU6, FU7 and FU8 are connected to the DC busbar voltmeter PV2, and the lower ends of fuses FU6, FU7 and FU8 are connected to the input end of the conversion switch SA2;

[0048] The external power supply is a power supply L11, a fuse FU2, an auxiliary contact of an AC contactor KM, a heat sink FJ2 on a solid-state voltage regulator SCR, and a power supply N connected in series in sequence;

[0049] The external power supply is a power supply L11, a fuse FU1, an emergency stop switch SB0, a contactor contact of a comprehensive protector, and a stop voltage regulating button 1SB1, which are connected in series in sequence. After the start voltage regulating button 1SB2 is connected in parallel with an auxiliary contact of the AC contactor KM, the upper end is connected to the lower end of the stop voltage regulating button 1SB1, and the lower end is connected to the upper end of the AC contactor KM coil, and the AC contactor KM coil is connected to the power supply N;

[0050] The lower end of the emergency stop switch SB0, the auxiliary contact of the AC contactor KM, the operation indicator light HR1, and the power supply N are connected in series in sequence; the lower end of the emergency stop switch SB0, the auxiliary contact of the AC contactor KM, the stop indicator light HG1, and the power supply N are connected in series in sequence; after the solid-state voltage regulator SCR is connected in parallel with the protection action contact of the comprehensive protector, the upper end is connected to the lower end of the emergency stop switch SB0, and the lower end is connected to the upper end of the fault indicator light HY1, and the fault indicator light HY1 is connected to the power supply N; the lower end of the emergency stop switch SB0, the circuit breaker contact of the comprehensive protector, the auxiliary contact of the air switch QF, the shunt coil of the air switch QF, and the power supply N are connected in series in sequence;

[0051] The timer T power supply, output voltmeter PV1, DC busbar voltmeter PV2, oscilloscope SBQ power supply, and output ammeter PA are connected in parallel, and the upper end is connected to the emergency stop switch SB0, and the lower end is connected to the power supply N; the lower end of the emergency stop switch SB0, the conversion switch SA1, the timer T normally closed contact, the relay KA1, and the power supply N are connected in series in sequence;

[0052] The two ends of the excitation winding indicator light BD1 are respectively connected to the lead wires of the excitation lamp-1 and the excitation lamp-2, and the two ends of the demagnetization winding indicator light BD2 are respectively connected to the lead wires of the demagnetization lamp-1 and the demagnetization lamp-2; the two ends of the fuse RTO are respectively connected to the air switch QF2 and the diode VD, the air switch QF2 is connected to the anode lead wire of the diode, and the diode VD is connected to the cathode lead wire of the diode.

[0053] like Figure 3 As shown, the integrated protector adopts the integrated protector MMPR-220 / T.

[0054] like Figure 6 As shown, during the test, the external circuits required by the power box are all designed as explosion-proof plug connectors.

[0055] like Figure 6 As shown, the power box requires external circuits including power supplies U, V, W, diode anode, diode cathode, excitation lamp-1, excitation lamp-2, demagnetization lamp-1, demagnetization lamp-2, DC voltage-1, DC voltage-2, timing node-1, timing node-2, oscilloscope-1, oscilloscope-2 wiring terminals, all of the above wiring terminals are designed as explosion-proof plug connectors and are arranged in sequence from top to bottom on the side of the power box body.

[0056] like Figure 5 As shown, the solid-state voltage regulator SCR adopts a solid-state voltage regulator of model SCR-3-H380-150A, which is provided with a radiator, a fan, and a sliding rheostat. The fan is installed on the lower side of the AC contactor KM, and vents are installed on both sides of the lower part of the power box body.

[0057] The power box is provided with a pull rod that can be pulled out externally. The bottom of the power box is provided with a roller that can be removed outside the box.

[0058] like Figure 5 As shown, the integrated protector, timer T, oscilloscope SBQ, output voltmeter PV1, DC busbar voltmeter PV2, and output ammeter PA are all placed on the front of the power box body, and a visual window is installed at the corresponding position of the power box body shell.

[0059] The present invention is used as follows:

[0060] (1) Start the test chamber

[0061] Press the start voltage regulation button 1SB2, the AC contactor KM is closed, the solid-state voltage regulator SCR is energized, and the operation indicator HR1 is on. Switch the conversion switch SA2 to "input voltage", the input voltage is about AC 220V.

[0062] (2) Adjust the output voltage

[0063] Switch the conversion switch SA2 to "output voltage", adjust the sliding rheostat, the voltmeter value changes continuously according to the adjustment, maintain the output voltage at AC50V, stop starting the voltage adjustment button 1SB2, and disconnect the AC contactor KM.

[0064] (3) Simulation excitation test

[0065] ① Operation content: Turn off the power supply of the test chamber, according to Figure 8 Wiring. Close the air switch QF of the test box, and after about 10-12 seconds, confirm that the synchronous machine timing and excitation are successful.

[0066] ② Experimental phenomenon: The simulation operation steps and phenomena are shown in Table 1; the DC bus waveform of the oscilloscope is shown in Fig. 9 .

[0067] Table 1 Simulation excitation test steps and phenomena

[0068]

[0069] (4) Simulated demagnetization test

[0070] ① Operation content

[0071] STP1: Disconnect the air switch QF and press the diode VD Fig.10 Test wiring diagram wiring. Connect the diode VD and the C (or A or B) phase thyristor in parallel in the same direction;

[0072] STP2: Close the air switch QF, the demagnetization winding indicator light BD2 and the excitation winding indicator light BD1 are both half-lit, and the rectifier bridge waveform is out of control waveform;

[0073] STP3: After about 10-12 seconds, the control module automatically switches on the excitation, the excitation winding indicator light BD1 turns from half bright to full bright, the de-excitation winding indicator light BD2 turns from half bright to off, and the rectifier bridge waveform is a full-wave rectifier waveform. Fig. 9 .

[0074] STP4: Use a shorting wire to short-circuit the two ends of the diode ZQ. The demagnetization winding indicator light BD2 and the excitation winding indicator light BD1 turn half bright. The rectifier bridge waveform is out of control. The oscilloscope waveform is shown. Fig.11 .

[0075] Table 2 Simulated demagnetization test steps and phenomena

[0076]

[0077] (5) After the test, remove the excitation winding indicator light BD1 and the de-excitation winding indicator light BD2, the test power supply, and the diode VD, and restore the wiring of the starting resistor, rotor winding, and AC exciter. See the wiring diagram for details. Figure 7 .

[0078] In the past, when conducting experiments, it was necessary to carry two light bulbs to the site for testing. The light bulbs were fragile and inconvenient to carry.

[0079] The power box of the present invention integrates two light bulbs, the excitation winding indicator light BD1 and the demagnetization winding indicator light BD2. The light bulbs are 100W incandescent lamps. The indicator position is on the right side of the second row from the bottom. The second one on the right is the demagnetization winding indicator light BD2, and the third one on the right is the excitation winding indicator light BD1. Figure 5 shown.

[0080] When performing automatic excitation performance testing, after the switch is turned on, about 12 seconds later, the excitation winding indicator light BD1 lights up and the rectifier bridge voltage waveform is a full-wave rectified waveform. However, the test time was previously measured separately using a built-in timer, which was inconvenient to use.

[0081] A timer is installed in the power box of the present invention, and the model is JDM11220V power supply 0V short circuit timing. The installation position is in the upper right corner of the box body, and a visual window is installed at the corresponding position of the outer shell of the box body.

[0082] In the designed control loop, a timer is added, and the timer T power supply is connected in parallel at 101 and N of the control circuit to provide power to the timer. A conversion switch SA1 is connected in series at 101 to select the three positions of disconnect timing, zero position, and closed timing, and then the normally closed contact of the timer is connected in series.

[0083] In the past, when performing automatic excitation performance testing, RF energized control performance testing, and KQ opening and closing performance testing, it was necessary to carry an adjustment oscilloscope, which was inconvenient.

[0084] The present invention is designed to integrate the oscilloscope SBQ into the power box, and the model of the oscilloscope is TO1112D. Figure 5 As shown, the oscilloscope SBQ is placed on the right side of the middle part of the box and a visual window is installed. The oscilloscope SBQ power supply is connected in parallel at 101 and N of the control circuit to provide power to the oscilloscope SBQ.

[0085] In the past, when conducting tests, it was necessary to manually disconnect the lines, which was a tedious and complicated process.

[0086] The present invention designs the external circuit required during the test as an explosion-proof plug connector, and the wiring and disconnection can be completed by plugging and unplugging, thereby improving the test efficiency. The wiring terminals of power sources U, V, W, diode anode, diode cathode, excitation lamp-1, excitation lamp-2, demagnetization lamp-1, demagnetization lamp-2, DC voltage-1, DC voltage-2, timing node-1, timing node-2, oscilloscope-1, and oscilloscope-2 are designed as explosion-proof plug connectors and placed on the left side of the box, and are arranged from top to bottom in sequence. When conducting the test, it is only necessary to plug and unplug as needed, which is safe and convenient.

[0087] In the past, power boxes had more electrical components and they were densely packed, making them prone to overheating.

[0088] The power box of the present invention is provided with a fan, and an air inlet and an air outlet are designed on the lower side of the box. The model of the fan is SCR-3-H380-150A (fan with radiator and sliding rheostat), the fan is installed on the lower side of the contactor, the three-phase main circuit power supply is respectively connected in series to the lower side of the three-phase power supply of the contactor, and vents are installed on the left and right sides of the lower part of the box, the air inlet is installed on the left side, and the air outlet is installed on the right side.

[0089] The electrical equipment and instruments to be tested are integrated in a power box, but the power box is large and heavy, and it needs to be carried by multiple people and climb stairs, which is inconvenient to use. The present invention is designed with a removable pull rod outside the power box, and a roller is configured at the bottom of the power box. The roller can be removed outside the box, and has the function of climbing stairs.

[0090] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. An instrument capable of realizing excitation test of synchronous motor in explosion-proof area, comprising a power box; characterized in that: An air switch QF, an AC contactor KM, a solid-state voltage regulator SCR, and a comprehensive protector are arranged in the power box. The upper end of the air switch QF is connected to an external power supply, the lower end of the air switch QF is connected to the upper end of the AC contactor KM, the lower end of the AC contactor KM is connected to the upper ends of the fuses RTOA, RTOB, and RTOC, the lower ends of the fuses RTOA, RTOB, and RTOC are connected to the upper end of the solid-state voltage regulator SCR, and the lower end of the solid-state voltage regulator SCR is respectively connected to the upper ends of the current transformer TA1, the current transformer TA2, and the current transformer TA3, wherein the connection lines of the solid-state voltage regulator SCR and the current transformer TA1, the current transformer TA2, and the current transformer TA3 pass through the current transformer CT of the comprehensive protector; The lower terminals L11, L12, and L13 of the air switch QF are connected to the upper ends of fuses FU3, FU4, and FU5 respectively, and the lower ends of fuses FU3, FU4, and FU5 are connected to the input end of the conversion switch SA2, and the output end of the conversion switch SA2 is connected to the output voltmeter PV1; The lower end of the solid-state voltage regulator SCR is connected to the upper ends of fuses FU6, FU7 and FU8, the lower ends of fuses FU6, FU7 and FU8 are connected to the DC busbar voltmeter PV2, and the lower ends of fuses FU6, FU7 and FU8 are connected to the input end of the conversion switch SA2; The external power supply is a power supply L11, a fuse FU2, an auxiliary contact of an AC contactor KM, a heat sink FJ2 on a solid-state voltage regulator SCR, and a power supply N connected in series in sequence; The external power supply is a power supply L11, a fuse FU1, an emergency stop switch SB0, a contactor contact of a comprehensive protector, and a stop voltage regulating button 1SB1, which are connected in series in sequence. After the start voltage regulating button 1SB2 is connected in parallel with an auxiliary contact of the AC contactor KM, the upper end is connected to the lower end of the stop voltage regulating button 1SB1, and the lower end is connected to the upper end of the AC contactor KM coil, and the AC contactor KM coil is connected to the power supply N; The lower end of the emergency stop switch SB0, the auxiliary contact of the AC contactor KM, the operation indicator light HR1, and the power supply N are connected in series in sequence; the lower end of the emergency stop switch SB0, the auxiliary contact of the AC contactor KM, the stop indicator light HG1, and the power supply N are connected in series in sequence; after the solid-state voltage regulator SCR is connected in parallel with the protection action contact of the comprehensive protector, the upper end is connected to the lower end of the emergency stop switch SB0, and the lower end is connected to the upper end of the fault indicator light HY1, and the fault indicator light HY1 is connected to the power supply N; the lower end of the emergency stop switch SB0, the circuit breaker contact of the comprehensive protector, the auxiliary contact of the air switch QF, the shunt coil of the air switch QF, and the power supply N are connected in series in sequence; The timer T power supply, output voltmeter PV1, DC busbar voltmeter PV2, oscilloscope SBQ power supply, and output ammeter PA are connected in parallel, and the upper end is connected to the emergency stop switch SB0, and the lower end is connected to the power supply N; the lower end of the emergency stop switch SB0, the conversion switch SA1, the timer T normally closed contact, the relay KA1, and the power supply N are connected in series in sequence; The two ends of the excitation winding indicator light BD1 are respectively connected to the lead wires of the excitation lamp-1 and the excitation lamp-2, and the two ends of the demagnetization winding indicator light BD2 are respectively connected to the lead wires of the demagnetization lamp-1 and the demagnetization lamp-2; the two ends of the fuse RTO are respectively connected to the air switch QF2 and the diode VD, the air switch QF2 is connected to the anode lead wire of the diode, and the diode VD is connected to the cathode lead wire of the diode.

2. The apparatus for realizing excitation test of synchronous motor in explosion-proof area according to claim 1, characterized in that: The comprehensive protector adopts the comprehensive protector MMPR-220 / T.

3. The apparatus capable of realizing excitation test of synchronous motor in explosion-proof area according to claim 1, characterized in that: During the test, the external circuits required by the power box are all designed as explosion-proof plug connectors.

4. The apparatus for realizing excitation test of synchronous motor in explosion-proof area according to claim 3, characterized in that: The power box requires external circuits including power supplies U, V, W, diode anode, diode cathode, excitation lamp-1, excitation lamp-2, demagnetization lamp-1, demagnetization lamp-2, DC voltage-1, DC voltage-2, timing node-1, timing node-2, oscilloscope-1, and oscilloscope-2 wiring terminals. All of the above wiring terminals are designed as explosion-proof plug connectors and are arranged in sequence from top to bottom on the side of the power box body.

5. The apparatus capable of realizing excitation test of synchronous motor in explosion-proof area according to claim 1, characterized in that: The solid-state voltage regulator SCR adopts a solid-state voltage regulator of model SCR-3-H380-150A, which is equipped with a radiator, a fan, and a sliding rheostat. The fan is installed on the lower side of the AC contactor KM, and vents are installed on both sides of the lower part of the power box body.

6. The apparatus capable of realizing excitation test of synchronous motor in explosion-proof area according to claim 1, characterized in that: The power box is externally provided with a pull rod which can be pulled out.

7. The apparatus capable of realizing excitation test of synchronous motor in explosion-proof area according to claim 1, characterized in that: The bottom of the power box is provided with rollers, which can be removed outside the box.

8. The apparatus capable of realizing excitation test of synchronous motor in explosion-proof area according to claim 1, characterized in that: The comprehensive protector, timer T, oscilloscope SBQ, output voltmeter PV1, DC busbar voltmeter PV2, and output ammeter PA are all placed on the front of the power box body, and a visual window is installed at the corresponding position of the power box body shell.

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