A generator stator bar insulation condition evaluation test system and test method

Abstract

The application provides a kind of generator stator bar insulation state evaluation test system, which includes voltage current monitoring part, test power supply part, test measurement part, test electrode part and remote monitoring control part;Remote monitoring control part includes data conversion module, host computer and control switch assembly, host computer is connected with low-voltage voltage measurement device, high-voltage voltage measurement device, partial discharge measurement device and dielectric loss tester through data conversion module, data transmission connection, data conversion module is connected with test power supply part control, data conversion module is connected with high-voltage voltage measurement device, partial discharge measurement device and dielectric loss tester control through control switch assembly respectively.The generator stator bar insulation state evaluation test system can quickly and accurately complete the data collection of stator bar insulation state evaluation test, and has guiding significance for the insulation state evaluation of generator stator bar.

Description

Technical Field

[0001] This invention relates to generator stator bar testing, and particularly to a generator stator bar insulation condition assessment test system and test method. Background Technology

[0002] Large generators are crucial equipment in power systems, and their operational stability directly impacts the reliability of power supply. Statistics show that over 40% of high-voltage generator failures are caused by stator insulation faults. Therefore, the operating condition of generator stator windings has a vital influence on the power system. For assessing the insulation condition of long-serving generator stator windings and for emergency repairs of generator stator winding faults, insulation condition assessment tests on individual stator bars are of great significance.

[0003] The insulation condition assessment of generator stator bars mainly involves analyzing parameters such as partial discharge level (maximum partial discharge quantity, partial discharge phase index, partial discharge density index, skewness, kurtosis, asymmetry, and interrelationships), dielectric loss level (dielectric loss tanδ, dielectric loss increase rate, capacitance increase rate), and dielectric strength (insulation resistance, current increase rate). However, because these parameters require measurement using different equipment and on-site assembly for testing, the test data exhibits significant dispersion and the testing cycle is long, which greatly affects the insulation condition assessment results of the generator stator bars. To reduce the dispersion of test data, obtain more accurate insulation condition assessment results for generator stator bars, and shorten the testing time for faster generator fault repair, an insulation condition assessment test system and method capable of measuring multiple parameters should be developed. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a generator stator bar insulation condition assessment test system and method, which can quickly and accurately collect data for stator bar insulation condition assessment tests, and provides guidance for generator stator bar insulation condition assessment work.

[0005] The technical solution adopted in this invention is as follows:

[0006] A generator stator bar insulation condition assessment test system includes a voltage and current monitoring section, a test power supply section, a test measurement section, a test electrode section, and a remote monitoring and control section.

[0007] The voltage and current monitoring section includes a low-voltage measuring device and a high-voltage measuring device; the test power supply section is connected to the 220V single-phase power supply of the mains via the low-voltage measuring device, providing power to the voltage and current monitoring section, the test measurement section, the test electrode section, and the remote monitoring and control section. The test power supply section is equipped with an adjustable reactor, which compensates for the capacitance of the test measurement device; the voltage and current monitoring section monitors the voltage and current on the low-voltage side of the test transformer of the test power supply device via the low-voltage measuring device, and monitors the voltage of the stator bar test specimen of the test electrode section via the high-voltage measuring device;

[0008] The test measurement section includes a partial discharge measuring device capable of checking the partial discharge, insulation status and fault diagnosis of the test electrode section, and a dielectric loss tester capable of testing the dielectric loss of the test electrode section.

[0009] The remote monitoring and control section includes a data conversion module, a host computer, and a control switch assembly. The host computer is connected to the low-voltage measuring device, the high-voltage measuring device, the partial discharge measuring device, and the dielectric loss tester via the data conversion module. The data conversion module is connected to the test power supply section via the control switch assembly.

[0010] Furthermore, the test power supply device includes a voltage regulator, a test transformer, and an adjustable reactor; the low-voltage measuring device is an AC voltage stabilizer; the input terminal of the AC voltage stabilizer is connected to the 220V power frequency single-phase power supply of the grid, the output terminal of the AC voltage stabilizer is connected to the input terminal of the voltage regulator, the output terminal of the voltage regulator is connected to the input terminal of the test transformer, and the output terminal of the test transformer is connected to the adjustable reactor, the high-voltage measuring device, the partial discharge monitoring device, and the test electrode section, respectively.

[0011] Furthermore, the output terminal of the test transformer is connected to a protective resistor, which is connected to the adjustable reactor, the high-voltage measuring device, the partial discharge monitoring device, and the test electrode section through the protective resistor.

[0012] Furthermore, the high-voltage measuring device of the test measuring apparatus includes a high-voltage fuse, a high-voltage arm capacitor, and a low-voltage arm capacitor; the high-voltage fuse, the high-voltage arm capacitor, and the low-voltage arm capacitor form a high-voltage capacitor divider, and the two ends of the high-voltage capacitor divider are connected to the output end of the test transformer.

[0013] Furthermore, the partial discharge measuring device includes a coupling capacitor, an impedance detector, and a partial discharge tester; the coupling capacitor and the impedance detector are connected in series, the coupling capacitor is connected to the output terminal of the test transformer, the impedance detector is connected to the output terminal of the test transformer, the coupling capacitor and the detection impedance are connected in series and then in parallel across the two ends of the test electrode section, and the partial discharge tester is connected in parallel across the two ends of the detection impedance.

[0014] Furthermore, the test electrode section includes a stator bar sample, a measuring electrode, and a shielding electrode; the stator bar sample and the shielding electrode are installed on both sides of the measuring electrode, and after the stator bar sample and the shielding electrode are connected, they are respectively connected to the output terminal of the test transformer, the high voltage measuring device, the partial discharge measuring device, and the dielectric loss tester.

[0015] Furthermore, an inflatable bag is provided on one side of the measuring electrode, and an adhesive tape is installed on the inflatable bag. The bottom of the inflatable bag is provided with an inflation hole and a wiring hole. The inflatable bag is connected to the air pump through the inflation hole, and the air pump is controlled by the data conversion module of the remote monitoring and control part. A gas pressure sensor is provided on the connecting pipe between the inflatable bag and the air pump, and the gas pressure sensor is connected to the data conversion module of the remote monitoring and control part for data transmission.

[0016] Furthermore, the data conversion module is connected to the output terminal of the AC voltage regulator, connected to the connection line between the high-voltage arm capacitor and the low-voltage arm capacitor, connected to the partial discharge tester, and connected to the dielectric loss tester, respectively. The control switch assembly includes a controllable circuit breaker, a controllable circuit breaker, and a controllable changeover switch. The first controllable circuit breaker is located on the connection line between the high-voltage arm capacitor and the low-voltage arm capacitor of the high-voltage voltage measuring device. The second controllable circuit breaker is located on the connection line between the coupling capacitor and the test transformer of the partial discharge measuring device. The first controllable changeover switch is located on the connection line between the coupling capacitor and the impedance detector of the partial discharge measuring device. The controllable changeover switch is connected to the connection line between the high-voltage arm capacitor and the low-voltage arm capacitor. The second and third controllable changeover switches are respectively located on the connection line between the dielectric loss tester and the test electrode section.

[0017] Furthermore, the generator stator bar insulation condition assessment test system also includes an environmental parameter detector. The environmental parameter detector is connected to the data conversion module of the remote monitoring and control section for data transmission. The environmental parameter detector is equipped with an environmental temperature and humidity sensor and an altitude parameter detection sensor.

[0018] A test method for assessing the insulation condition of generator stator bars, based on the aforementioned test system for assessing the insulation condition of generator stator bars, is characterized by comprising the following steps:

[0019] Step 1: Install the measuring electrode and shielding electrode of the test electrode section at the test position of the sample, turn on the power, and the host computer displays that the parameters are normal.

[0020] Step 2: Adjust the positions of the controllable circuit breaker and controllable transfer switch of the control switch assembly according to the requirements of the measurement parameters, and monitor the environmental parameters through the environmental parameter detector;

[0021] Step 3: Start increasing the voltage. Adjust the parameters of the adjustable reactor of the test power supply device according to the parameters detected by the low voltage and high voltage measuring devices of the voltage and current monitoring section until the voltage reaches the test value. The host computer records the test measurement values ​​of partial discharge, insulation status, fault diagnosis, and dielectric loss test.

[0022] Step 4: The test ends. The host computer sends an end command to the data conversion module, and the data conversion module controls the test power supply to automatically reduce the voltage.

[0023] The beneficial effects of this invention are:

[0024] Traditional measurement methods involve multiple testing devices being used for each test, requiring reassembly for each test, resulting in significant data dispersion. This invention, however, allows for the measurement of multiple parameters using a single testing system by simply changing the switch positions. The overall parameters of the testing device remain constant, thus minimizing data dispersion.

[0025] This invention can conduct insulation condition assessment tests on multiple stator bars at the same time, which can greatly shorten the repair time for generator stator faults and improve testing efficiency.

[0026] The environmental parameter monitoring device of the present invention includes the monitoring of altitude parameters, and takes into account the influence of altitude for insulation status assessment, making it highly applicable to high-altitude areas in the west.

[0027] This invention monitors and controls the entire testing process via a host computer, eliminating the need for test personnel to operate high-voltage lines and thus improving test safety. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0029] Figure 1 This is a circuit diagram of the test system of the present invention;

[0030] Figure 2 This is a schematic diagram of the measuring electrode of the present invention;

[0031] Figure 3 This is a flowchart of the test method of the present invention;

[0032] Explanation of reference numerals in the attached figures:

[0033] 1—220V single-phase power supply of the mains frequency; 2—AC voltage stabilizer; 3—voltage regulator; 4—test transformer; 5—protective resistor; 6—adjustable reactor; 7—high-voltage fuse; 8—high-voltage arm capacitor; 9—first controllable circuit breaker; 10—low-voltage arm capacitor; 11—second controllable circuit breaker; 12—coupling capacitor; 13—first controllable transfer switch; 14—impedance detector; 15—partial discharge tester; 16—stator bar sample; 17—measuring electrode; 171—inflatable bag; 172—adhesive tape; 173—inflatable hole; 174—wiring hole; 18—shielding electrode; 19—second controllable transfer switch; 20—third controllable transfer switch; 21—dielectric loss tester; 22—gas pressure sensor; 23—air pump; 24—environmental parameter monitoring section; 25—data conversion module; 26—host computer. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the process of assessing the insulation condition of generator stator bars, several parameters require measurement using different equipment, and the tests need to be assembled on-site. This results in significant data dispersion and a long test cycle, which greatly affects the assessment results of the generator stator bar insulation condition. To reduce the dispersion of test data, obtain more accurate assessment results of the generator stator bar insulation condition, and shorten the test time for faster generator fault repair, this embodiment provides a generator stator bar insulation condition assessment test system. Specifically, as follows... Figure 1 As shown, the generator stator bar insulation condition assessment test system includes a voltage and current monitoring section, a test power supply section, a test measurement section, a test electrode section, and a remote monitoring and control section.

[0036] The voltage and current monitoring section primarily functions to: 1. monitor the voltage and current on the low-voltage side of the test transformer 4 of the power supply testing device; and 2. monitor the voltage of the stator bar test specimen 16 in the test electrode section. The voltage and current monitoring section consists of two parts: a low-voltage measuring device and a high-voltage measuring device. The low-voltage measuring device is an AC voltage regulator 2, and the high-voltage measuring device is a high-voltage capacitive voltage divider composed of a high-voltage fuse 7, a high-voltage arm capacitor 8, and a low-voltage arm capacitor 10.

[0037] The main functions of the test power supply are: 1. To supply power to the voltage and current monitoring section, test measurement section, test electrode section, and remote monitoring and control section via the 220V single-phase power supply 1 of the mains; 2. To compensate for the capacitance of the test measurement device through the adjustable reactor 6. The test power supply consists of a voltage regulator 3, a test transformer 4, and an adjustable reactor 6. The input terminal of the AC voltage regulator 2 is connected to the 220V single-phase power supply 1 of the mains, the output terminal of the AC voltage regulator 2 is connected to the input terminal of the voltage regulator 3, the output terminal of the voltage regulator 3 is connected to the input terminal of the test transformer 4, and the output terminal of the test transformer 4 is connected to the adjustable reactor 6, the high-voltage measuring device, the partial discharge monitoring device, and the test electrode section, respectively. The AC voltage regulator 2 can monitor the voltage and current on the low-voltage side of the test transformer 4, and the adjustable reactor 6 can compensate for the capacitance of the stator bar test specimen 16. Furthermore, in order to effectively protect the adjustable reactor 6, the high voltage measuring device, the partial discharge monitoring device, and the test electrode section, a protective resistor 5 is also connected to the output terminal of the test transformer 4, which is connected to the adjustable reactor 6, the high voltage measuring device, the partial discharge monitoring device, and the test electrode section through the protective resistor 5.

[0038] The main functions of the test measurement section are: 1. To inspect the partial discharge, insulation status, and fault diagnosis of the test electrode section; 2. To perform dielectric loss testing on the test electrode section. The test measurement section includes a partial discharge measuring device and a dielectric loss tester 21. The partial discharge measuring device includes a coupling capacitor 12, an impedance detector 14, and a partial discharge tester 15. The coupling capacitor 12 and the impedance detector 14 are connected in series. The coupling capacitor 12 is connected to the output terminal of the test transformer 4, and the impedance detector 14 is connected to the output terminal of the test transformer 4. The coupling capacitor 12 and the impedance detector 14 are connected in series and then in parallel across the two ends of the test electrode section. The partial discharge tester 15 is connected in parallel across the two ends of the impedance detector 14. The partial discharge tester 15 detects partial discharge on the test electrode section. The impedance detector 14 determines the insulation status and fault diagnosis of the test electrode section based on its impedance value. The dielectric loss tester 21 performs dielectric loss testing on the test electrode section.

[0039] The test electrode section includes a stator bar sample 16, a measuring electrode 17, and a shielding electrode 18. The stator bar sample 16 and the shielding electrode 18 are installed on both sides of the measuring electrode 17. After the stator bar sample 16 and the shielding electrode 18 are connected, they are respectively connected to the output terminal of the test transformer 4, the high-voltage measuring device, the partial discharge measuring device, and the dielectric loss tester 21. The stator bar sample 16 is used to simulate the stator wire of a motor or generator to test the withstand voltage performance of the insulation material. The measuring electrode 17 facilitates the measurement of parameters such as voltage and current of the stator bar sample 16. The shielding electrode 18 is used to shield the surface leakage current of the stator bar, eliminate external electromagnetic interference, and ensure the accuracy of the test.

[0040] The measuring electrode 17 is typically made of metal, requiring a high degree of surface finish to ensure test accuracy. However, imperfections or unevenness on the surface of the metal electrode can easily lead to discharge under high voltage, thus interfering with the test results. To improve test accuracy, such as... Figure 2 As shown, the measuring electrode 17 is made of conductive rubber material, and the overall size of the measuring electrode is 200mm*300mm. An inflatable bag 171 is provided on one side of the measuring electrode 17. The inflatable bag 171 is made of soft fabric for easy adhesion. An adhesive tape 172 is installed on the inflatable bag 171. An inflation hole 173 and a wiring hole 174 are provided at the bottom of the inflatable bag. The inflatable bag 171 is connected to the air pump 23 through the inflation hole 173. The air pump 23 is connected to the data conversion module 25 of the remote monitoring and control unit for control. A gas pressure sensor 22 is installed on the connecting pipe between the inflatable bag 171 and the air pump 23. The gas pressure sensor 22 is connected to the data conversion module 25 of the remote monitoring and control unit for data transmission. The inflatable bag 171 serves as an isolation device, preventing discharge problems caused by uneven or incomplete parts of the sample surface. In addition, the air bag 171 can increase the contact area between the measuring electrode 17 and the stator bar sample 16, so that a better electric field distribution is formed between the measuring electrode 17 and the stator bar sample 16, reducing the change of electric field gradient, thereby improving the accuracy of the test.

[0041] The remote monitoring and control section includes a data conversion module 25, a host computer 26, and a control switch assembly. The host computer 26 is connected to the data conversion module 25, and the control switch assembly includes a controllable circuit breaker and a controllable transfer switch.

[0042] The data conversion module 25 is connected to the output terminal of the AC voltage regulator 2 to receive the voltage and current monitoring data of the low-voltage side of the test transformer 4; the data conversion module 25 is connected to the adjustable reactor 6 for control, so that the host computer 26 can control the adjustable reactor 6 to adjust the reactance value by monitoring the voltage and current output of the AC voltage regulator 2, so as to optimally compensate the capacitive current of the stator bar test specimen 16 and reduce the power capacity of the entire system.

[0043] The first controllable circuit breaker 9 is installed on the connection line between the high-voltage arm capacitor 8 and the low-voltage arm capacitor 10 of the high-voltage voltage measuring device. The second controllable circuit breaker 11 is installed on the connection line between the coupling capacitor 12 and the test transformer 4 of the partial discharge measuring device. The first controllable changeover switch 13 is installed on the connection line between the coupling capacitor 12 and the impedance detector 14 of the partial discharge measuring device, and is also connected to the connection line between the high-voltage arm capacitor 8 and the low-voltage arm capacitor 10. The first controllable circuit breaker 9, the second controllable circuit breaker 11, and the first controllable changeover switch 13 are all connected to the data conversion module 25. The data conversion module 25 is connected to the connection line between the high-voltage arm capacitor 8 and the low-voltage arm capacitor 10, and is also connected to the partial discharge tester 15. The host computer 26 controls the positions of the first controllable circuit breaker 9, the second controllable circuit breaker 11 and the first controllable changeover switch 13 through the data conversion module 25, so that the high-voltage arm capacitor 8 and the coupling capacitor 12 can be used interchangeably, realizing function switching while monitoring the voltage and partial discharge of the stator bar test specimen 16.

[0044] The second controllable switch 19 and the third controllable switch 20 are respectively located on the connection lines between the dielectric loss tester 21 and the test electrode section. Both the second controllable switch 19 and the third controllable switch 20 are connected to the data conversion module 25, which is connected to the dielectric loss tester 21. The data conversion module 25 controls the switching of the position display functions of the second controllable switch 19 and the third controllable switch 20.

[0045] In addition, the data conversion module 25 is connected to the air pump 23 and the gas pressure sensor 22 respectively. The host computer 26 controls the start and stop of the air pump 23 through the data detected by the gas pressure sensor 22, so as to realize the inflation and deflation of the air bag 171 of the measuring electrode 17.

[0046] The above is the main circuit of the generator stator bar insulation condition assessment test system. Based on this, the generator stator bar insulation condition assessment test system also includes an environmental parameter detector. The environmental parameter detector is connected to the data conversion module 25 of the remote monitoring and control section for data transmission. The environmental parameter detector is equipped with an environmental temperature and humidity sensor and an altitude parameter detection sensor.

[0047] The working principle of this generator stator bar insulation condition assessment test system is as follows:

[0048] The environmental parameter monitoring section 24 sends data to the data conversion module 25 to record environmental parameters; the voltage and current data monitored by the AC voltage regulator 2 are transmitted to the data conversion module 25, and the data conversion module 25 sends control signals to control the adjustable reactor 6 to adjust the increase or decrease of the reactance value; according to the different measurement requirements of the parameters, the data conversion module 25 sends control signals to adjust the positions of the first controllable circuit breaker 9, the second controllable circuit breaker 11, the first controllable transfer switch 13, the second controllable transfer switch 19, and the third controllable transfer switch 20; the gas pressure sensor 22 monitors the gas pressure data of the measuring electrode 17 and transmits it to the data conversion module 25, and the data conversion module 25 sends control signals to control the start and stop of the air pump 23 based on the gas pressure data; the partial discharge tester 15, the dielectric loss tester 21, and other monitoring data are sent to the host computer 26 through the data conversion module 25, and the control commands issued by the host computer 26 are also sent to each component through the data conversion module 25.

[0049] Based on the generator stator bar insulation condition assessment test system described above, the generator stator bar insulation condition assessment test can be carried out according to the following steps;

[0050] Step 1: After installing the measuring electrode 17 and the shielding electrode 18, start the host computer 26, record the environmental parameters, and the host computer 26 controls the air pump 23 to start. After the gas pressure of the measuring electrode 17 meets the test requirements, the air pump 23 stops.

[0051] Step 2: The host computer 26 controls the first controllable circuit breaker 9, the second controllable circuit breaker 11, the first controllable transfer switch 13, the second controllable transfer switch 19, and the third controllable transfer switch 20 to the corresponding positions to meet the conditions for conducting the dielectric loss test. The test voltage is increased, and the output of the voltage regulator 3 and the reactance value of the adjustable reactor 6 are controlled. The test voltage meets the test requirements, the dielectric loss tester 21 performs the measurement, and the host computer 26 records the test data. After the test is completed, the voltage is reduced to zero.

[0052] Step 3: The host computer 26 controls the first controllable circuit breaker 9, the second controllable circuit breaker 11, the first controllable transfer switch 13, the second controllable transfer switch 19, and the third controllable transfer switch 20 to the corresponding positions to meet the conditions for conducting a partial discharge test. The test voltage is increased, and the output of the voltage regulator 3 and the reactance value of the adjustable reactor 6 are controlled. The test voltage meets the test requirements, the partial discharge tester 15 performs the measurement, and the host computer 26 records the test data. After the test is completed, the voltage is reduced to zero.

[0053] Step 4: The host computer 26 controls the first controllable circuit breaker 9, the second controllable circuit breaker 11, the first controllable transfer switch 13, the second controllable transfer switch 19, and the third controllable transfer switch 20 to their respective positions to meet the conditions for conducting the AC withstand voltage test. The test voltage is increased, and the output of the voltage regulator 3 and the reactance value of the adjustable reactor 6 are controlled. When the test voltage meets the test requirements, the timing is started, and the host computer 26 records the test data. After the test is completed, the voltage is reduced to zero.

[0054] Step 5: After the test is completed, the host computer prints the test data and disconnects the 220V single-phase power supply.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A generator stator bar insulation condition assessment test system, characterized in that: The generator stator bar insulation condition assessment test system includes a voltage and current monitoring section, a test power supply section, a test measurement section, a test electrode section, and a remote monitoring and control section; The voltage and current monitoring section includes a low-voltage measuring device and a high-voltage measuring device; the test power supply section is connected to the 220V single-phase power supply of the mains via the low-voltage measuring device, providing power to the voltage and current monitoring section, the test measurement section, the test electrode section, and the remote monitoring and control section. The test power supply section is equipped with an adjustable reactor, which compensates for the capacitance of the test measurement device; the voltage and current monitoring section monitors the voltage and current on the low-voltage side of the test transformer of the test power supply device via the low-voltage measuring device, and monitors the voltage of the stator bar test specimen of the test electrode section via the high-voltage measuring device; The test measurement section includes a partial discharge measuring device capable of checking the partial discharge, insulation status and fault diagnosis of the test electrode section, and a dielectric loss tester capable of testing the dielectric loss of the test electrode section. The remote monitoring and control section includes a data conversion module, a host computer, and a control switch assembly. The host computer is connected to the low-voltage measuring device, the high-voltage measuring device, the partial discharge measuring device, and the dielectric loss tester via the data conversion module. The data conversion module is connected to the test power supply section via the control switch assembly.

2. The generator stator bar insulation condition assessment test system according to claim 1, characterized in that: The test power supply includes a voltage regulator, a test transformer, and an adjustable reactor; the low-voltage measuring device is an AC voltage stabilizer. The input terminal of the AC voltage stabilizer is connected to the 220V single-phase power supply of the mains. The output terminal of the AC voltage stabilizer is connected to the input terminal of the voltage regulator. The output terminal of the voltage regulator is connected to the input terminal of the test transformer. The output terminal of the test transformer is connected to the adjustable reactor, the high-voltage measuring device, the partial discharge monitoring device, and the test electrode section, respectively.

3. The generator stator bar insulation condition assessment test system according to claim 2, characterized in that: The output terminal of the test transformer is connected to a protective resistor, which is connected to an adjustable reactor, a high-voltage measuring device, a partial discharge monitoring device, and the test electrode section.

4. The generator stator bar insulation condition assessment test system according to claim 1, characterized in that: The high-voltage measuring device of the test measuring apparatus includes a high-voltage fuse, a high-voltage arm capacitor, and a low-voltage arm capacitor; the high-voltage fuse, the high-voltage arm capacitor, and the low-voltage arm capacitor form a high-voltage capacitor divider, and the two ends of the high-voltage capacitor divider are connected to the output end of the test transformer.

5. The generator stator bar insulation condition assessment test system according to claim 1, characterized in that: The partial discharge measurement device includes a coupling capacitor, an impedance detector, and a partial discharge tester; The coupling capacitor and impedance detector are connected in series. The coupling capacitor is connected to the output terminal of the test transformer, and the impedance detector is connected to the output terminal of the test transformer. The coupling capacitor and the detection impedance are connected in series and then in parallel across the two ends of the test electrode section. The partial discharge tester is connected in parallel across the two ends of the detection impedance.

6. The generator stator bar insulation condition assessment test system according to claim 1, characterized in that: The test electrode section includes a stator bar sample, a measuring electrode, and a shielding electrode; The stator bar test specimen and the shielding electrode are installed on both sides of the measuring electrode. After the stator bar test specimen and the shielding electrode are connected, they are respectively connected to the output terminal of the test transformer, the high voltage measuring device, the partial discharge measuring device, and the dielectric loss tester.

7. The generator stator bar insulation condition assessment test system according to claim 6, characterized in that: An inflatable bag is provided on one side of the measuring electrode. An adhesive tape is installed on the inflatable bag. An inflation hole and a wiring hole are provided at the bottom of the inflatable bag. The inflatable bag is connected to the air pump through the inflation hole. The air pump is controlled by the data conversion module of the remote monitoring and control section. A gas pressure sensor is provided on the connecting pipe between the inflatable bag and the air pump. The gas pressure sensor is connected to the data conversion module of the remote monitoring and control section for data transmission.

8. The generator stator bar insulation condition assessment test system according to claim 1, characterized in that: The data conversion module is connected to the output terminal of the AC voltage regulator, connected to the connection line between the high-voltage arm capacitor and the low-voltage arm capacitor, connected to the partial discharge tester, and connected to the dielectric loss tester. The control switch assembly includes a controllable circuit breaker, a controllable circuit breaker, and a controllable changeover switch. The first controllable circuit breaker is located on the connection line between the high-voltage arm capacitor and the low-voltage arm capacitor of the high-voltage voltage measuring device. The second controllable circuit breaker is located on the connection line between the coupling capacitor and the test transformer of the partial discharge measuring device. The first controllable changeover switch is located on the connection line between the coupling capacitor and the impedance detector of the partial discharge measuring device. The controllable changeover switch is connected to the connection line between the high-voltage arm capacitor and the low-voltage arm capacitor. The second and third controllable changeover switches are respectively located on the connection line between the dielectric loss tester and the test electrode section.

9. The generator stator bar insulation condition assessment test system according to claim 1, characterized in that: The generator stator bar insulation condition assessment test system also includes an environmental parameter detector. The environmental parameter detector is connected to the data conversion module of the remote monitoring and control section for data transmission. The environmental parameter detector is equipped with an environmental temperature and humidity sensor and an altitude parameter detection sensor.

10. A test method for assessing the insulation condition of generator stator bars, wherein the test method is based on the generator stator bar insulation condition assessment test system according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Install the measuring electrode and shielding electrode of the test electrode section at the test position of the sample, turn on the power, and the host computer displays that the parameters are normal. Step 2: Adjust the positions of the controllable circuit breaker and controllable transfer switch of the control switch assembly according to the requirements of the measurement parameters, and monitor the environmental parameters through the environmental parameter detector; Step 3: Start increasing the voltage. Adjust the parameters of the adjustable reactor in the test power supply section according to the parameters detected by the low voltage and high voltage measuring devices in the voltage and current monitoring section until the voltage reaches the test value. The host computer records the test measurement values ​​of partial discharge, insulation status, fault diagnosis, and dielectric loss test. Step 4: The test ends. The host computer sends an end command to the data conversion module, and the data conversion module controls the test power supply to automatically reduce the voltage.

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