Generator rotor winding turn-to-turn short circuit detection device

Abstract

The utility model relates to a generator rotor winding turn-to-turn short circuit detection device which comprises a control module, a function selection module, a test module and a power management module. The control module is used for sending a control instruction to the function selection module and the power management module; the function selection module is connected with the control module and is used for selecting the sub-test modules according to a control instruction of the control module; the test module is connected with the function selection module, the test module comprises a plurality of sub-test modules, and a generator rotor winding turn-to-turn short circuit fault is detected according to the sub-test modules selected by the function selection module; the power management module is connected with the control module and is used for supplying power to the sub-test module according to the control instruction. Through circuit optimization and function integration, the size and the weight of the testing device are greatly reduced, the testing device is convenient and simple to use, the working efficiency is improved, and the testing device has remarkable advantages in the aspects of reducing the detection time and improving the detection accuracy and the operation convenience.

Description

TECHNICAL FIELD

[0001] The present application relates to the motor detection technical field, in particular to a generator rotor winding inter-turn short circuit detection device. BACKGROUND

[0002] The rotor winding inter-turn short circuit is a common fault of large steam turbine generators, which can cause the reactive power output of the generator to decrease, the large shaft to be magnetized, the vibration to be intensified, and even the winding to be burned. Therefore, effectively testing the insulation condition of the rotor winding and avoiding the harm of the inter-turn short circuit are of great significance to ensure the safe operation of the generator. With the development of power equipment detection technology, the generator rotor winding fault detection technology has gradually become an important technical means. The technology realizes comprehensive monitoring of the state of the rotor winding through various detection methods, such as direct current resistance test, insulation resistance test, alternating current impedance and power loss test, so as to discover faults in time and improve the stability and reliability of the equipment.

[0003] There are various test methods for detecting the inter-turn short circuit fault of the rotor winding of a large generator, and the main methods of offline detection include direct current resistance test, insulation resistance test, repeated pulse test, alternating current impedance and power loss test. Since various detection methods have their own applicability, sensitivity to faults and accuracy of diagnosis are different. Therefore, during the maintenance of the generator, it is required to use various test methods to detect the insulation condition of the rotor winding so as to obtain various insulation information and make reliable and accurate diagnosis of the insulation state of the rotor winding. However, most of the current detection devices only support single fault detection, cannot simultaneously perform multiple tests, result in low detection efficiency, have poor adaptability to environmental factors such as temperature and humidity, are complex to operate, lack flexibility, and fail to fully solve the problems caused by the diversification of fault types and changes in the test environment. CONTENT OF THE INVENTION

[0004] Based on this, the present application provides a generator rotor winding inter-turn short circuit detection device for realizing diagnosis of the inter-turn short circuit fault of the generator rotor winding using various detection methods on the same platform, and has high integration to improve the accuracy and efficiency of detection.

[0005] In a first aspect, the present application provides a generator rotor winding inter-turn short circuit detection device, comprising:

[0006] A control module is configured to send a control instruction to the function selection module and the power management module.

[0007] The function selection module is connected with the control module and is configured to select a sub-test module according to the control instruction of the control module.

[0008] The test module is connected with the function selection module, and the test module comprises a plurality of sub-test modules, and the sub-test modules are used for detecting the turn-to-turn short circuit fault of the generator rotor winding according to the selection of the function selection module;

[0009] The power management module is connected with the control module, and is used for supplying power for the sub-test modules according to the control instruction.

[0010] In one embodiment, the sub-test module of the test module is a direct current resistance test module, and the direct current resistance test module comprises:

[0011] The constant current source output circuit is connected with the first processor and the power management module, and is used for inputting constant direct current to the generator rotor winding;

[0012] The first signal acquisition circuit is connected with the generator rotor winding, and is used for acquiring the current signal and the voltage signal at both ends of the generator rotor winding;

[0013] The first data processing circuit is connected with the first signal acquisition circuit, and is used for performing digital-to-analog conversion on the current signal and the voltage signal at both ends of the generator rotor winding;

[0014] The first processor is connected with the first data processing circuit, and is used for receiving the current signal and the voltage signal after digital-to-analog conversion, and obtaining the direct current resistance value of the generator rotor winding.

[0015] In one embodiment, the direct current resistance test module further comprises:

[0016] The temperature and humidity sensor is in communication connection with the processor, and is used for acquiring the temperature and the humidity of the test environment, so that the processor converts the test resistance at different temperatures and different humidities.

[0017] In one embodiment, the direct current resistance test module further comprises:

[0018] The discharge protection unit is connected with the constant current source output circuit, and the discharge protection unit comprises a discharge resistance and a reverse diode, and is used for preventing the residual current from causing harm to the detection device and the detection personnel.

[0019] In one embodiment, the sub-test module of the test module is an insulation resistance test module, and the insulation resistance test module comprises:

[0020] The boost rectifier module is connected with the second processor and the generator rotor winding, and the boost rectifier module outputs direct current voltage to the generator rotor winding according to the adjustment of the second processor;

[0021] The second signal acquisition circuit is connected with the generator rotor winding, and is used for acquiring the current signal and the voltage signal generated by the direct current voltage on the generator rotor winding;

[0022] The second data processing circuit is connected with the second signal acquisition circuit, and is configured to perform digital-to-analog conversion on the current signal and the voltage signal.

[0023] The second processor is connected with the second data processing circuit, and is configured to receive the current signal and the voltage signal after digital-to-analog conversion, and obtain the insulation resistance value of the generator rotor winding.

[0024] In one of the embodiments, the boost rectifier module comprises:

[0025] The rectifier filter circuit is connected with the power management module, and is configured to convert the alternating power input by the power management module into direct current power;

[0026] The bridge inverter circuit is connected with the rectifier filter circuit, and is configured to convert the direct current of the direct current power into alternating current;

[0027] The high-frequency boost transformer is connected with the bridge inverter circuit, and is configured to increase the voltage of the alternating current;

[0028] The voltage doubler rectifier circuit is connected with the high-frequency boost transformer and the generator rotor winding, and is configured to rectify the alternating current to obtain direct current, and input the rectified direct current to the generator rotor winding.

[0029] In one of the embodiments, the sub-test module of the test module is an alternating impedance and power loss test module, and the alternating impedance and power loss test module comprises:

[0030] The single-phase power conversion module is connected with the power management module, and is configured to input the alternating power input by the power management module to the generator rotor winding after conversion;

[0031] The third signal acquisition circuit is connected with the generator rotor winding, and is configured to acquire a response signal generated by the direct current voltage on the generator rotor winding;

[0032] The third data processing circuit is connected with the third signal acquisition circuit, and is configured to perform digital-to-analog conversion on the response signal generated by the generator rotor winding;

[0033] The third processor is connected with the third data processing circuit, and is configured to receive the response signal after digital-to-analog conversion, and obtain the alternating impedance value and the power loss value of the generator rotor winding.

[0034] In one of the embodiments, the sub-test module of the test module is a repetitive pulse detection module, and the repetitive pulse detection module comprises:

[0035] The excitation circuit is connected with the rotor winding of the generator, and is configured to generate two excitation signals and input the excitation signals to both ends of the generator rotor winding;

[0036] The fourth signal acquisition circuit is connected with the output end of the excitation circuit and the input end of the excitation circuit, and the response signal generated on the generator rotor winding is input to the input end of the excitation circuit through the fourth signal acquisition circuit.

[0037] The fourth processor is connected with the excitation circuit, and performs repeated pulse detection on the generator rotor winding.

[0038] In one of the embodiments, the power management module is connected with a plurality of sub-test modules in the test module through a multi-channel selection switch, and the power management module controls the on-off of the multi-channel selection switch according to the control instruction.

[0039] In one of the embodiments, the function selection module is in communication connection with a plurality of sub-test modules in the test module through a plurality of independent communication lines.

[0040] The above generator rotor winding inter-turn short circuit detection device can dynamically select different sub-test modules in the test module according to the control instruction through the function selection module, so that the generator rotor winding inter-turn short circuit detection device can flexibly adjust the detection mode according to the demand, and solves the problem that the traditional detection equipment can only perform single type detection. The plurality of independent sub-test modules integrated in the test module can perform multi-dimensional detection on the generator rotor winding inter-turn short circuit fault, different sub-test modules cover different detection methods, and through circuit optimization and function integration, the volume and weight of the test device are greatly reduced, the test device is convenient and simple to use, and the working efficiency is improved. Through the adjustment of the function selection module, the detection requirements of the generator rotor winding short circuit fault under different types and different working conditions can be met, and the detection time is reduced, the detection accuracy and operation convenience are improved, and the detection device has obvious advantages. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0042] Figure 1 The structure diagram of the generator rotor winding inter-turn short circuit detection device in some embodiments of the present application.

[0043] Figure 2 The structure diagram of the generator rotor winding inter-turn short circuit detection device in another embodiment of the present application.

[0044] Figure 3 The connection diagram of the man-machine exchange module and the peripheral equipment in some embodiments of the present application.

[0045] Figure 4 The circuit structure framework diagram of the DC resistance test module in some embodiments of the present application.

[0046] Figure 5 The circuit structure framework diagram of the insulation resistance test module in some embodiments of the present application.

[0047] Figure 6 The circuit structure framework diagram of the AC impedance and power loss test module in some embodiments of the present application.

[0048] Figure 7 The circuit structure framework diagram of the repetitive pulse detection module in some embodiments of the present application.

[0049] BRIEF DESCRIPTION OF DRAWINGS

[0050] 10, control module; 102, human-computer exchange module; 104, industrial computer module; 20, function selection module; 30, test module; 302, DC resistance test module; 3022, first processor; 3024, constant current source output circuit; 3026, discharge protection unit; 3028, first signal acquisition circuit; 3030, first data processing circuit; 3032, temperature and humidity sensor; 304, insulation resistance test module; 3042, second processor; 3044, boost rectifier module; 3046, second signal acquisition circuit; 3048, second data processing circuit; 3050, high-voltage negative feedback circuit; 3052, rectifier filter circuit; 3054, bridge inverter circuit; 3056, high-frequency boost transformer; 3058, voltage doubler rectifier circuit; 306, AC impedance and power loss test module; 3062, third processor; 3064, single-phase power conversion module; 3066, third signal acquisition circuit; 3068, third data processing circuit; 3070, single-phase rectifier circuit; 3072, single-phase inverter circuit; 3074, output filter circuit; 308, repetitive pulse detection module; 3082, fourth processor; 3084, excitation circuit; 3086, fourth signal acquisition circuit; 3088, excitation signal generation circuit; 3090, DA data conversion circuit; 3092, excitation signal driving circuit; 3094, excitation signal output control switch; 3096, output impedance potentiometer; 3098, signal acquisition control switch; 3100, sub-signal acquisition circuit; 40, power management module; 50, AC 220 power supply; 60, generator rotor winding. DETAILED DESCRIPTION

[0051] In order to make the above objectives, features and advantages of the present application more clear and understandable, the detailed description of the specific embodiments of the present application is made below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different manners and forms without departing from the spirit or scope of the present application, and those skilled in the art can make similar improvements and modifications without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0052] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0053] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0054] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0056] It is to be understood that when an element as a "fixed" or "disposed" on another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0057] To solve the problems in the related art, in a first aspect, referring to Figure 1 An embodiment of the present application provides a generator rotor winding 60-turn short circuit detection device, which comprises a control module 10, a function selection module 20, a test module 30 and a power management module 40; the control module 10 is used to send control instructions to the function selection module 20 and the power management module 40; the function selection module 20 is connected with the control module 10 and is used to select a sub-test module 30 according to the control instruction of the control module 10; the test module 30 is connected with the function selection module 20, the test module 30 comprises a plurality of sub-test modules 30, and the sub-test module 30 selected by the function selection module 20 is used to detect a generator rotor winding 60-turn short circuit fault; and the power management module 40 is connected with the control module 10 and is used to supply power for the sub-test module 30 according to the control instruction.

[0058] Exemplarily, the control module 10 comprises a man-machine exchange module 102 and an industrial computer module 104, the industrial computer module 104 is an embedded industrial computer mainboard, the embedded industrial computer mainboard coordinates and controls the entire detection device, including data communication, data processing, control display, printing and storage functions. The man-machine exchange module 102 is connected with the industrial computer module 104, the man-machine exchange module 102 comprises a plurality of peripherals such as a keyboard, a display, a printer and a memory, etc., a detection personnel edits a control instruction through the peripherals, the control instruction is sent to the industrial computer module 104 by the man-machine exchange module 102, and the industrial computer module 104 selects a sub-test module 30 in the test module 30 according to the control instruction. The test module 30 is a collection module of a plurality of sub-test modules 30, the test module 30 comprises a plurality of sub-test modules 30 with independent functions, which are used to detect a generator rotor winding 60-turn short circuit fault by using different test methods of the sub-test modules 30 according to the control instruction. The power management module 40 is connected with the control module 10 and the test module 30, and the power management module 40 supplies power for the sub-test module 30 in the test module 30 according to the control instruction of the control module 10, and the test module 30 selected by the function selection module 20 detects a generator rotor winding 60-turn short circuit fault alone.

[0059] In this embodiment, different sub-test modules 30 in the test module 30 are dynamically selected according to the control instruction by the function selection module 20, so that the generator rotor winding 60 turn-to-turn short circuit detection device can flexibly adjust the detection mode according to the demand, solving the problem that the traditional detection equipment can only perform single type detection. The test module 30 internally integrates multiple independent sub-test modules 30, which can perform multi-dimensional detection on the generator rotor winding 60 turn-to-turn short circuit fault. Different sub-test modules 30 cover different detection methods, and through circuit optimization and function integration, the volume and weight of the test device are greatly reduced, the test device is convenient and simple to use during use, and the working efficiency is improved. Through the adjustment of the function selection module 20, the generator rotor winding 60 short circuit fault detection requirements under different types and different working conditions can be met, which has significant advantages in reducing detection time, improving detection accuracy and operation convenience.

[0060] Reference Figure 2 In some embodiments, the power management module 40 is connected with multiple sub-test modules 30 in the test module 30 through a multi-way selection switch, and the power management module 40 controls the on-off of the multi-way selection switch according to the control instruction; the function selection module 20 is in communication connection with multiple sub-test modules 30 in the test module 30 through multiple independent communication lines.

[0061] Among them, the test module 30 includes multiple sub-test modules 30, such as the insulation resistance test module 304, the direct current resistance test module 302, the repetitive pulse detection module 308, and the alternating current impedance and power loss test module 306. The industrial computer module 104 is connected with the insulation resistance test module 304, the direct current resistance test module 302, the repetitive pulse detection module 308, and the alternating current impedance and power loss test module 306 through the function selection module 20 respectively.

[0062] Specifically, the power management module 40 is connected with the alternating current 220 power supply 50, and the alternating current power supply supplies power to the sub-test modules 30 in the test module 30 through the power management module 40. The power management module 40 is provided with six output ends, which are connected with the industrial computer module 104, the man-machine interface module, the insulation resistance test module 304, the direct current resistance test module 302, the repetitive pulse detection module 308, and the alternating current impedance and power loss test module 306 respectively, and provides working power for each module. The power management module 40 is connected with each test module 30 through a multi-way selection switch. The power management module 40 is controlled by the industrial computer module 104, the industrial computer module 104 sends a control instruction to the power management module 40, controls the on-off of the corresponding multi-way selection switch in the power management module 40, and thus provides test power for the selected sub-test module 30. The power management module 40 supplies power through an internal multi-way selection switch, only one switch is closed at the same time, and only one sub-test module 30 is powered on at a time.

[0063] The function selection module 20 is composed of RS232 communication serial port and RS232 communication line, which is used to select corresponding test module 30, so as to isolate each test module 30 from each other and not interfere with each other. The industrial computer module 104 sends control instructions to the selected sub-test module 30 by controlling the conduction of the RS232 communication serial port, controls the sub-test module 30 to work, and transmits the test data out of the industrial computer module 104.

[0064] As shown in the example, Figure 3 The peripherals connected to the human-computer exchange module 102 are powered separately. The keyboard is connected to an input port of the human-computer exchange module 102, and is used to input control instructions and test content information to the human-computer exchange module 102, so as to realize functions such as test function selection, function test, data storage and printing.

[0065] The display is connected to an input port of the human-computer exchange module 102, and is a liquid crystal display screen, which is used to display test functions and test data of the test device. The printer is connected to an input port of the human-computer exchange module 102, and is a micro panel printer, which is used to print test data. The memory is connected to an input port of the human-computer exchange module 102, and is a secure digital card, which is used to store test data. The test data can be exported from the human-computer exchange module 102 through the memory, so as to facilitate subsequent viewing, editing and analysis of the test data.

[0066] In the embodiment, through the cooperation of the power management module 40 and the multi-way selection switch, the power supply of each sub-test module 30 can be flexibly controlled, so as to ensure that only one sub-test module 30 obtains power supply at the same time, avoid test conflicts caused by the simultaneous power-on of multiple sub-test modules 30, and ensure the test stability of the system. The industrial computer module 104 accurately selects the sub-test module 30 to be worked through the control of the RS232 communication serial port, and controls the sub-test module 30, so as to ensure the accuracy of data transmission and control commands in the test process. Not only the communication process between modules is simplified, but also the real-time performance and reliability of data processing are improved.

[0067] Referring to Figure 4In some embodiments, the sub-test module 30 of the test module 30 is a direct current resistance test module 302, which comprises a constant current source output circuit 3024, a first signal acquisition circuit 3028, a first data processing circuit 3030 and a first processor 3022; the constant current source output circuit 3024 is connected with the first processor 3022 and the power management module 40, and is used for inputting a constant direct current to the generator rotor winding 60; the first signal acquisition circuit 3028 is connected with the generator rotor winding 60, and is used for acquiring current signals and voltage signals at both ends of the generator rotor winding 60; the first data processing circuit 3030 is connected with the first signal acquisition circuit 3028, and is used for performing digital-to-analog conversion on the current signals and the voltage signals at both ends of the generator rotor winding 60; the first processor 3022 is connected with the first data processing circuit 3030, and is used for receiving the current signals and the voltage signals after digital-to-analog conversion, and obtaining a direct current resistance value of the generator rotor winding 60.

[0068] The first processor 3022 is an ARM processor, which is a high-performance, small-size instruction set processor. The ARM processor is connected with the industrial computer module 104 through a communication serial port, transmits test data to the industrial computer module 104, and finally outputs through the man-machine exchange module 102. The power management module 40 is connected with the power input ends of the constant current source output circuit 3024 and the first processor 3022, and provides power for the direct current resistance test module 302. The first data processing circuit 3030 is an AD data processing circuit, which is used for performing digital-to-analog conversion on the response signals collected by the first acquisition circuit.

[0069] Specifically, the first processor 3022 is connected with the power management module 40, the constant current source output circuit 3024, the first data processing circuit 3030, the temperature and humidity sensor 3032 and the industrial computer module 104. The power management module 40, the constant current source output circuit 3024, the discharge protection unit 3026, the generator rotor winding 60, the first signal acquisition circuit 3028, the first data processing circuit 3030 and the first processor 3022 are sequentially connected. The direct current resistance measurement module inputs a constant direct current to the generator rotor winding 60 through the constant current source output circuit 3024, the size of the constant direct current is 2A or 5A, the current generates a corresponding voltage value at both ends of the rotor winding, and the current signals and the voltage signals at both ends of the rotor winding are collected through the first signal acquisition circuit 3028. After the current signals and the voltage signals are processed by the first data processing circuit 3030, they are input to the first processor 3022, and the first processor 3022 calculates the direct current resistance value according to Ohm's law.

[0070] Further, the direct current resistance test module 302 further comprises a temperature and humidity sensor 3032 and a discharge protection unit 3026. The temperature and humidity sensor 3032 is in communication connection with the processor, for collecting the temperature and humidity of the test environment, so that the processor converts the test resistance at different temperatures and different humidities. The temperature and humidity sensor 3032 is connected with the first processor 3022, detects the temperature and humidity of the test environment, and transmits the data to the first processor 3022, and the first processor 3022 converts the test resistance at different temperatures, reduces the influence of the test environment factors on the direct current resistance test result. The discharge protection unit 3026 is connected with the constant current source output circuit 3024, and the discharge protection unit 3026 comprises a discharge resistance and a reverse diode, which prevents the residual current caused by the winding inductance from causing harm to the rotor winding and the test personnel.

[0071] In the embodiment, through the cooperative work of the constant current source output circuit 3024, the signal acquisition circuit, the data processing circuit and the processor, the direct current resistance value of the generator rotor winding 60 can be accurately measured. The temperature and humidity sensor 3032 monitors the temperature and humidity of the test environment in real time, and adjusts the test result according to different environmental conditions, to ensure the accuracy of the test data. The discharge protection unit 3026 prevents the residual current caused by the winding inductance from causing potential harm to the rotor winding or the test personnel. The test precision and safety of the direct current resistance test module 302 are improved, the fault diagnosis capability is enhanced, and the maintenance and fault prevention of the generator are facilitated.

[0072] Referring to Figure 5 In some embodiments, the sub-test module 30 of the test module 30 is an insulation resistance test module 304, which comprises a boost rectifier module 3044, a second signal acquisition circuit 3046, a second data processing circuit 3048 and a second processor 3042. The boost rectifier module 3044 is connected with the second processor 3042 and the generator rotor winding 60, and adjusts the boost rectifier module 3044 to output a direct current voltage to the generator rotor winding 60 according to the second processor 3042; the second signal acquisition circuit 3046 is connected with the generator rotor winding 60, for collecting the current signal and the voltage signal generated by the direct current voltage on the generator rotor winding 60; the second data processing circuit 3048 is connected with the second signal acquisition circuit 3046, for digital-to-analog conversion of the current signal and the voltage signal; the second processor 3042 is connected with the second data processing circuit 3048, for receiving the digital-to-analog converted current signal and voltage signal, and obtaining the insulation resistance value of the generator rotor winding 60.

[0073] The voltage-boosting rectifier module 3044 comprises a rectifier filter circuit 3052, a bridge inverter circuit 3054, a high-frequency voltage-boosting transformer 3056 and a voltage-doubling rectifier circuit 3058. The rectifier filter circuit 3052 is connected to the power management module 40 and is configured to convert the alternating current power input by the power management module 40 into direct current power. The bridge inverter circuit 3054 is connected to the rectifier filter circuit 3052 and is configured to convert the direct current of the direct current power into alternating current. The high-frequency voltage-boosting transformer 3056 is connected to the bridge inverter circuit 3054 and is configured to boost the voltage of the alternating current. The voltage-doubling rectifier circuit 3058 is connected to the high-frequency voltage-boosting transformer 3056 and the generator rotor winding 60 and is configured to rectify the alternating current to obtain direct current and input the rectified direct current to the generator rotor winding 60.

[0074] Specifically, the second processor 3042 is connected to the rectifier filter circuit 3052, the bridge inverter circuit 3054, the voltage-doubling rectifier circuit 3058, the second data processing circuit 3048 and the industrial computer module 104. The power management module 40, the rectifier filter circuit 3052, the bridge inverter circuit 3054, the high-frequency voltage-boosting transformer 3056, the voltage-doubling rectifier circuit 3058, the generator rotor winding 60, the second signal acquisition circuit 3046, the second data processing circuit 3048 and the second processor 3042 are sequentially connected. The insulation resistance testing module 304 uses the constant voltage method to test the insulation resistance value of the rotor winding. The rectifier filter circuit 3052 first converts the alternating current power input by the power management module 40 into direct current power. After the direct current is converted into alternating current by the bridge unidirectional inverter circuit, the voltage is boosted by the high-frequency voltage-boosting transformer 3056, and then rectified by the voltage-doubling rectifier circuit 3058, the stable direct current voltage is input to the generator rotor winding 60. The direct current voltage generates current signals and voltage signals on the rotor winding. The current signals and voltage signals are sampled and processed by the second signal acquisition circuit 3046 and the second data processing circuit 3048, and then input to the second processor 3042. After calculation, the insulation resistance value is obtained.

[0075] The second processor 3042 is connected to the rectifier filter circuit 3052, the bridge inverter circuit 3054 and the voltage-doubling rectifier circuit 3058, respectively. By controlling the conduction angle of the diodes and triodes in each circuit, the size of the direct current voltage input to the rotor is controlled. The direct current voltage level output by the insulation resistance testing module 304 has four levels, which are 250V, 500V, 1000V and 2500V, respectively, which can meet the requirements of different types of tests. At the same time, the 2500V level can also meet the voltage requirements of the rotor winding withstand voltage test. Using the insulation resistance testing module 304 can not only test the insulation resistance of the rotor winding, but also perform the withstand voltage test, and the test range is wide. The second processor 3042 is connected to the industrial computer module 104 through the communication serial port, transmits the test data to the industrial computer module 104, and finally outputs through the man-machine exchange module 102.

[0076] Further, the insulation resistance test module 304 further comprises a high-voltage negative feedback circuit 3050 connected with the generator rotor winding 60 and the second data processing circuit 3048, for feeding back the DC voltage size output from the voltage doubling rectifier circuit 3058 to the generator rotor winding 60, and performing digital-analog conversion on the feedback data by the second data processing circuit 3048.

[0077] In the embodiment, the insulation resistance test module 304 tests the insulation resistance of the generator rotor winding 60, the boost rectifier module 3044 outputs stable DC voltage to the rotor winding through the rectifier filter circuit 3052, the bridge inverter circuit 3054, the high-frequency boost transformer 3056 and the voltage doubling rectifier circuit 3058, and provides multiple adjustment gears to meet different testing requirements. The second signal acquisition circuit 3046 acquires the current and voltage signals on the rotor winding, the second processor 3042 calculates the insulation resistance of the rotor winding according to the signals, and transmits the results to the industrial computer module 104, and finally outputs through the man-machine exchange module 102.

[0078] Referring to Figure 6 In some embodiments, the sub-test module 30 of the test module 30 is an alternating current impedance and power loss test module 306, which comprises a single-phase power conversion module 3064, a third signal acquisition circuit 3066, a third data processing circuit 3068 and a third processor 3062. The single-phase power conversion module 3064 is connected with the power management module 40, for converting the alternating current power input from the power management module 40 and inputting to the generator rotor winding 60; the third signal acquisition circuit 3066 is connected with the generator rotor winding 60, for acquiring the response signal generated by the DC voltage on the generator rotor winding 60; the third data processing circuit 3068 is connected with the third signal acquisition circuit 3066, for performing digital-analog conversion on the response signal generated by the generator rotor winding 60; the third processor 3062 is connected with the third data processing circuit 3068, for receiving the digital-analog converted response signal and obtaining the alternating current impedance value and the power loss value of the generator rotor winding 60.

[0079] The single-phase power conversion module 3064 comprises a single-phase rectifier circuit 3070, a single-phase inverter circuit 3072, and an output filter circuit 3074. The third processor 3062 is connected with the power management module 40, the single-phase rectifier circuit 3070, the single-phase inverter circuit 3072, the output filter circuit 3074, the third data processing circuit, and the industrial computer module 104. The power management module 40, the single-phase rectifier circuit 3070, the single-phase inverter circuit 3072, the output filter circuit 3074, the generator rotor winding 60, the third signal acquisition circuit 3066, the third data processing circuit, and the third processor 3062 are sequentially connected. The single-phase rectifier circuit 3070 converts the alternating current power input by the power management module 40 into direct current power. The direct current power is converted into alternating current power by the single-phase inverter circuit 3072, and then input to the generator rotor winding 60 through the output filter circuit 3074. The signal of the generator rotor winding 60 is input to the third processor 3062 after being conditioned, acquired, and processed by the third signal acquisition circuit 3066. The third processor 3062 calculates the alternating impedance value and the power loss value of the generator rotor winding 60.

[0080] The third processor 3062 is connected with the single-phase rectifier circuit 3070, the single-phase inverter circuit 3072, and the output filter circuit 3074. The third processor 3062 changes the size of the alternating voltage and current of the rotor winding by controlling the conduction angle of the diodes and triodes in each circuit. Therefore, the alternating impedance and power loss test module 306 does not need a traditional power frequency voltage regulator to provide current and voltage for the rotor winding. Instead, an electronic switching circuit is used to replace the traditional high-power voltage regulator to provide alternating voltage and current for the rotor winding. This effectively reduces the size and weight of the test device and the size of the alternating impedance and power loss test module 306. The third processor 3062 is connected with the industrial computer module 104 through a communication serial port, transmits test data to the industrial computer module 104, and finally outputs the test data through the human-computer exchange module 102.

[0081] Referring to Figure 7 In some embodiments, the sub-test module 30 of the test module 30 is a repetitive pulse detection module 308. The repetitive pulse detection module 308 comprises an excitation circuit 3084, a fourth signal acquisition circuit 3086, and a fourth processor 3082. The excitation circuit 3084 is connected with the rotor winding of the generator and is used to generate two excitation signals and input the excitation signals to both ends of the generator rotor winding 60. The fourth signal acquisition circuit 3086 is connected with the output end of the excitation circuit 3084 and the input end of the excitation circuit 3084. The response signal generated on the generator rotor winding 60 is input to the input end of the excitation circuit 3084 through the fourth signal acquisition circuit 3086. The fourth processor 3082 is connected with the excitation circuit 3084 and performs repetitive pulse detection on the generator rotor winding 60.

[0082] The excitation circuit 3084 comprises an excitation signal generating circuit 3088, a DA data conversion circuit 3090, an excitation signal driving circuit 3092, an excitation signal output control switch 3094, and an output impedance potentiometer 3096. The fourth signal acquisition circuit 3086 comprises a signal acquisition control switch 3098 and a sub-signal acquisition circuit 3100.

[0083] Specifically, the fourth processor 3082 is connected with the power management module 40, the excitation signal generating circuit 3088, the signal acquisition control switch 3098, the excitation signal output control switch 3094, the output impedance potentiometer 3096, and the industrial computer module 104. The excitation signal generating circuit 3088, the DA data conversion circuit 3090, the excitation signal driving circuit 3092, the excitation signal output control switch 3094, the output impedance potentiometer 3096, the generator rotor winding 60, the signal acquisition control switch 3098, the sub-signal acquisition circuit 3100, and the excitation signal generating circuit 3088 are sequentially connected. The excitation signal driving circuit 3092 is composed of two driving circuits, the excitation signal output control switch 3094 is composed of two switches, the signal acquisition control switch 3098 is composed of two switches, and the output impedance potentiometer 3096 is composed of two potentiometers. The repeated pulse detection module 308 generates a digital excitation signal by the excitation signal generating circuit 3088, which is input to the DA data conversion circuit 3090. The DA data conversion circuit 3090 converts the digital excitation signal into an analog excitation signal. After the analog excitation signal is adjusted in waveform and amplified by the excitation signal driving circuit 3092, it is divided into two paths and output to the excitation signal output control switch 3094. The two excitation signals are input to the two ends of the rotor winding after being adjusted in waveform by the output impedance potentiometers 3096 of the respective circuits. The input end of the signal acquisition control switch 3098 is connected with the output end of the output impedance potentiometer 3096, and the response signal at the two ends of the rotor winding is acquired by the sub-signal acquisition circuit 3100 through the signal acquisition control switch 3098, and finally input to the excitation signal generating circuit 3088.

[0084] The fourth processor 3082 is connected with the excitation signal output control switch 3094 to send a closing or opening instruction to the excitation signal output switch, so as to realize the emission or stop of the excitation signal. The fourth processor 3082 is connected with the signal acquisition control switch 3098 to send a closing or opening instruction to the signal acquisition control switch 3098, so as to realize the input or stop of the response signal. The fourth processor 3082 is connected with the excitation signal generating circuit 3088 to realize data interaction. The fourth processor 3082 is connected with the industrial computer module 104 through a communication serial port to transmit test data to the industrial computer module 104, and finally output through the man-machine exchange module 102.

[0085] The two signal output terminals of the output impedance potentiometer 3096 are connected with the two signal input terminals of the signal acquisition control switch 3098, the two signal output terminals of the signal acquisition control switch 3098 are connected with the two signal input terminals of the sub-signal acquisition circuit 3100, and the fourth signal acquisition circuit 3086 acquires the response signal input to the excitation signal generation circuit 3088. The output excitation signal and the acquired response signal use the same pair of signal terminals, so that the test wiring is simple. The excitation signal generation part and the data acquisition part are integrated, and the generator rotor winding 60 can be detected by repeated pulse detection without external oscilloscope, so that the test device is more portable and the on-site detection operation is more convenient.

[0086] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0087] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description simple, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.

[0088] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A generator rotor winding inter-turn short circuit detection device, characterised in that, The device comprises: a control module for sending control instructions to a function selection module and a power management module; the function selection module is connected to the control module and is used for selecting a sub-test module according to the control instruction of the control module; the test module is connected to the function selection module, the test module comprises a plurality of sub-test modules, and a sub-test module selected by the function selection module is used for detecting a short-circuit fault between turns of a generator rotor winding; the power management module is connected to the control module and is used for supplying power to the sub-test module according to the control instruction.

2. The apparatus of claim 1, wherein, The sub-test module of the test module is a direct-current resistance test module, and the direct-current resistance test module comprises: a constant current source output circuit connected to a first processor and the power management module, used for inputting constant direct current to the generator rotor winding; a first signal acquisition circuit connected to the generator rotor winding, used for acquiring a current signal and a voltage signal at both ends of the generator rotor winding; a first data processing circuit connected to the first signal acquisition circuit, used for performing digital-to-analog conversion on the current signal and the voltage signal at both ends of the generator rotor winding; a first processor connected to the first data processing circuit, used for receiving the current signal and the voltage signal after digital-to-analog conversion, and obtaining a direct-current resistance value of the generator rotor winding.

3. The apparatus of claim 2, wherein, The direct-current resistance test module further comprises: a temperature and humidity sensor in communication connection with the processor, used for acquiring temperature and humidity of a test environment, so that the processor converts a test resistance at different temperatures and different humidities.

4. The apparatus of claim 2, wherein, The direct-current resistance test module further comprises: a discharge protection unit connected to the constant current source output circuit, the discharge protection unit comprising a discharge resistor and a reverse diode, used for preventing residual current from causing harm to a detection device and a detection personnel.

5. The apparatus of claim 1, wherein, The sub-test module of the test module is an insulation resistance test module, and the insulation resistance test module comprises: a boost rectification module connected to a second processor and the generator rotor winding, used for outputting a direct-current voltage to the generator rotor winding according to adjustment of the second processor on the boost rectification module; a second signal acquisition circuit connected to the generator rotor winding, used for acquiring a current signal and a voltage signal generated by the direct-current voltage on the generator rotor winding; a second data processing circuit connected to the second signal acquisition circuit, used for performing digital-to-analog conversion on the current signal and the voltage signal; a second processor connected to the second data processing circuit, used for receiving the current signal and the voltage signal after digital-to-analog conversion, and obtaining an insulation resistance value of the generator rotor winding.

6. The apparatus of claim 5, wherein, The boost rectification module comprises: a rectification filter circuit connected to the power management module, used for converting an alternating-current power input by the power management module into a direct-current power; a bridge inverter circuit connected to the rectification filter circuit, used for converting direct current of the direct-current power into alternating current; a high-frequency boost transformer connected to the bridge inverter circuit, used for increasing voltage of the alternating current. A voltage doubling rectifier circuit is connected with the high-frequency voltage boosting transformer and the generator rotor winding, for rectifying the AC power to obtain DC power, and inputting the rectified DC power to the generator rotor winding.

7. The apparatus of claim 1, wherein, The sub-test module of the test module is an AC impedance and power loss test module, which comprises: A single-phase power conversion module is connected with the power management module, for converting the AC power input by the power management module and inputting the converted AC power to the generator rotor winding; A third signal acquisition circuit is connected with the generator rotor winding, for acquiring a response signal generated by the DC voltage on the generator rotor winding; A third data processing circuit is connected with the third signal acquisition circuit, for digital-to-analog conversion of the response signal generated on the generator rotor winding; A third processor is connected with the third data processing circuit, for receiving the digital-to-analog converted response signal and obtaining the AC impedance value and power loss value of the generator rotor winding.

8. The apparatus of claim 1, wherein, The sub-test module of the test module is a repetitive pulse detection module, which comprises: An excitation circuit is connected with the rotor winding of the generator, for generating two excitation signals and inputting the excitation signals to both ends of the generator rotor winding; A fourth signal acquisition circuit is connected with the output end of the excitation circuit and the input end of the excitation circuit, and the response signal generated on the generator rotor winding is input to the input end of the excitation circuit through the fourth signal acquisition circuit; A fourth processor is connected with the excitation circuit, for repetitive pulse detection of the generator rotor winding.

9. The apparatus of claim 1, wherein, The power management module is connected with multiple sub-test modules in the test module through a multi-path selection switch, and the power management module controls the on-off of the multi-path selection switch according to the control instruction.

10. The apparatus of claim 1, wherein, The function selection module is communicatively connected with multiple sub-test modules in the test module through multiple independent communication lines.

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