Monitoring system, method and generator for a generator

Abstract

The application provides a generator monitoring system, a generator monitoring method and a generator, and relates to the technical field of generators, and comprises a temperature and humidity acquisition unit, which is used for acquiring a temperature value and a humidity value of a working environment of a generator stator; an insulation detection unit, which is used for acquiring an insulation resistance value of the generator stator; a heating unit, which is used for heating a cabin of the generator; a dehumidification unit, which is used for dehumidifying the cabin; and a main controller, which is used for controlling the heating unit and the dehumidification unit to work when the temperature value and / or the humidity value meets a first preset condition; and the main controller is further used for calculating a difference value between the insulation resistance value and a resistance threshold value, and adjusting an output power of the heating unit and an output flow of the dehumidification unit according to the size of the difference value when the temperature value or the humidity value meets the first preset condition and the insulation resistance value is lower than the resistance threshold value. The generator monitoring system provided by the application is favorable for improving the improvement precision of the working environment of the generator stator.

Description

Technical Field

[0001] This invention relates to the field of generator monitoring technology, and in particular to a generator monitoring system, method, and generator. Background Technology

[0002] Insulation resistance is the most basic insulation indicator in electrical equipment and circuits. Stator insulation testing of generators is a crucial step in ensuring the safe and reliable operation of generators, as the performance of stator insulation directly affects the generator's efficiency, lifespan, and safety. Generator insulation management during the installation phase is vital for ensuring the safety and quality of power plant transmission and transformation systems. The insulation performance of the generator stator degrades due to changes in environmental conditions such as temperature and humidity, potentially leading to eventual failure. Therefore, regularly verifying the generator's insulation class is an important parameter for ensuring controllable quality during generator installation.

[0003] Temperature and humidity have a significant impact on the insulation resistance of generators, directly affecting the performance of insulation materials and thus the insulation resistance of the generator. Currently, intelligent monitoring systems for generator insulation resistance can only measure insulation resistance data and lack automated management of the generator stator's working environment. Summary of the Invention

[0004] The purpose of this invention is to provide a generator monitoring system, method, and generator that can solve the technical problem that "currently, intelligent monitoring systems for generator insulation resistance can only measure insulation resistance data and lack automated management of the generator stator working environment".

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention provides a generator monitoring system, comprising: a temperature and humidity acquisition unit for acquiring the temperature and humidity values ​​of the generator stator's operating environment;

[0007] An insulation detection unit is used to collect the insulation resistance value of the generator stator;

[0008] A heating unit is used to heat the nacelle of the generator;

[0009] A dehumidification unit is used to dehumidify the cabin.

[0010] The main controller is electrically connected to the temperature and humidity acquisition unit, the insulation detection unit, the heating unit, and the dehumidification unit, respectively. When the temperature value and / or the humidity value meet a first preset condition, the main controller is used to control the heating unit and the dehumidification unit to work. The first preset condition includes: the temperature value is lower than a preset temperature threshold and the humidity value is higher than a preset humidity threshold.

[0011] When the temperature value and / or the humidity value meets the first preset condition, and the insulation resistance value is lower than the preset resistance threshold value, the main controller is further configured to calculate a difference between the resistance threshold value and the insulation resistance value, and adjust the output power of the heating unit and the output flow of the dehumidification unit according to the size of the difference.

[0012] In an embodiment of the present application, the dehumidification unit comprises:

[0013] a valve;

[0014] an execution member arranged on the valve to open the valve;

[0015] an air compressor connected with the valve, configured to provide dry air to the inside of the cabin through the valve;

[0016] the execution member and the air compressor are connected with the main controller, and the main controller is configured to control the air compressor to work and control the valve to open through the execution member when the temperature value and / or the humidity value meets the first preset condition;

[0017] When the temperature value and / or the humidity value meets the first preset condition, and the insulation resistance value is lower than the resistance threshold value, the main controller is further configured to calculate a difference between the resistance threshold value and the insulation resistance value, and control the execution member to adjust the opening degree of the air passage inside the valve to adjust the output flow of the dehumidification unit according to the size of the difference.

[0018] In an embodiment of the present application, the main controller is configured to set a plurality of different value ranges, and different value ranges correspond to different numbers of the heaters and different opening degrees of the air passage;

[0019] The main controller is configured to determine the difference value, and when the difference value is in a certain value range, the main controller controls a corresponding number of heaters to work and controls the air passage to have a corresponding opening degree.

[0020] In an embodiment of the present application, the temperature and humidity acquisition unit comprises:

[0021] a temperature sensor configured to acquire a temperature value of the working environment of the generator stator;

[0022] a humidity sensor configured to acquire a humidity value of the working environment of the generator stator;

[0023] a display screen;

[0024] The temperature sensor, the humidity sensor and the display screen are electrically connected with the main controller respectively, and the main controller is configured to control the display screen to display the temperature value, the humidity value and the insulation resistance value.

[0025] In an embodiment of the present application, the insulation detection unit comprises:

[0026] A three-phase commutation circuit is electrically connected with the terminal of the generator stator;

[0027] A high-voltage insulation resistance value measurement circuit is electrically connected with the three-phase commutation circuit;

[0028] The three-phase commutation circuit and the high-voltage insulation resistance value measurement circuit are connected with the main controller respectively; when the insulation resistance of the generator stator is measured, the main controller controls the three-phase commutation circuit to connect the corresponding phase of the generator stator to the high-voltage insulation resistance value measurement circuit, so as to measure the insulation resistance value of the corresponding phase of the generator stator through the high-voltage insulation resistance value measurement circuit.

[0029] In an embodiment of the present application, the system further comprises an alarm unit, which is connected with the main controller;

[0030] When any one of the temperature value, the humidity value and the insulation resistance value meets a second preset condition, the main controller is further configured to control the alarm unit to alarm;

[0031] The second preset condition comprises that the temperature value is lower than a preset temperature alarm threshold, the humidity value is higher than a preset humidity alarm threshold, and the insulation resistance value is lower than a preset resistance value alarm threshold.

[0032] In an embodiment of the present application, the alarm unit comprises a loudspeaker and / or a warning light.

[0033] In an embodiment of the present application, the system further comprises a human-computer interaction unit, which is electrically connected with the main controller, and is configured to generate and display the temperature curve, the humidity curve and the insulation resistance curve according to the real-time temperature value, humidity value and insulation resistance value respectively, and to display and modify the temperature threshold, the humidity threshold, the resistance value threshold, the temperature alarm threshold, the humidity alarm threshold and the resistance value alarm threshold.

[0034] In an embodiment of the present application, the system further comprises an emergency stop unit, which is connected with the main controller, and when the main controller receives an emergency stop signal sent by the emergency stop unit, the monitoring system of the generator is controlled to stop running.

[0035] The application also provides a monitoring method of a generator, comprising the following steps:

[0036] collecting a temperature value and a humidity value of a working environment of a stator of the generator;

[0037] collecting an insulation resistance value of the stator of the generator;

[0038] controlling a heating unit and a dehumidifying unit to work when the temperature value and / or the humidity value meets a first preset condition; wherein the first preset condition comprises that the temperature value is lower than the temperature threshold value and the humidity value is higher than the humidity threshold value;

[0039] calculating a difference value between the resistance threshold value and the insulation resistance value when the temperature value and / or the humidity value meets the first preset condition and the insulation resistance value is lower than the resistance threshold value, and adjusting the output power of the heating unit and the output flow of the dehumidifying unit according to the size of the difference value.

[0040] The application also provides a generator comprising the monitoring system of the generator as described above.

[0041] As described above, the application provides a monitoring system of a generator, which can improve the working environment of the stator of the generator when the temperature and / or humidity is abnormal, and realize the automatic management of the working environment of the stator of the generator; meanwhile, the application can further judge the abnormal condition of the insulation resistance when the temperature and / or humidity is abnormal, and adjust the output power of the heating unit and the output flow of the dehumidifying unit based on the abnormal condition of the insulation resistance, which is beneficial to improve the improvement precision of the working environment of the stator of the generator.

[0042] Of course, implementing any product of the application does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description only only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0044] Figure 1 Fig. 1 is a schematic diagram of the principle of the monitoring system of the generator in an embodiment of the application;

[0045] Figure 2 Fig. 2 is a circuit schematic diagram of a three-phase commutation circuit of the monitoring system of the generator in an embodiment of the application;

[0046] Figure 3A structural schematic diagram of a generator monitoring device of a generator monitoring system in an embodiment of the present application;

[0047] Figure 4 A structural schematic diagram of a heating unit of a generator monitoring system in an embodiment of the present application;

[0048] Figure 5 A structural schematic diagram of an actuator of a generator monitoring system in an embodiment of the present application;

[0049] Figure 6 A flowchart of a generator monitoring method in an embodiment of the present application.

[0050] In the figure:

[0051] 100-temperature and humidity acquisition unit, 110-temperature sensor, 120-humidity sensor, 130-display screen;

[0052] 200-insulation detection unit, 210-three-phase commutation circuit, 211-high-voltage relay, 220-high-voltage insulation resistance value measurement circuit;

[0053] 300-dehumidification unit, 310-valve, 320-actuator, 330-air compressor;

[0054] 400-heating unit, 410-heater, 420-relay group;

[0055] 500-main controller;

[0056] 600-alarm unit, 610-speaker, 620-alarm lamp;

[0057] 700-human-computer interaction unit;

[0058] 800-emergency stop unit;

[0059] 900-power supply, 910-12V power supply, 920-wiring terminal board, 930-air switch;

[0060] 1000-IoT unit. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0062] Refer to the drawings in the embodiments of the present application Figures 1-6The monitoring system of the generator according to the first embodiment of the present application is exemplarily illustrated. The monitoring system of the generator comprises a temperature and humidity acquisition unit 100, an insulation detection unit 200, a heating unit 400, a dehumidification unit 300 and a main controller 500.

[0063] The temperature and humidity acquisition unit 100 is configured to acquire a temperature value and a humidity value of a working environment of a stator of the generator; the insulation detection unit 200 is configured to acquire an insulation resistance value of the stator of the generator; the heating unit 400 is configured to heat a cabin of the generator; the dehumidification unit 300 is configured to dehumidify the cabin; the main controller 500 is electrically connected with the temperature and humidity acquisition unit 100, the insulation detection unit 200, the heating unit 400 and the dehumidification unit 300 respectively; when the temperature value and / or the humidity value meets a first preset condition, the main controller 500 is configured to control the heating unit 400 and the dehumidification unit 300 to work; wherein the first preset condition comprises that the temperature value is lower than a preset temperature threshold value and / or the humidity value is higher than a preset humidity threshold value; when the temperature value and / or the humidity value meets the first preset condition and the insulation resistance value is lower than a preset resistance threshold value, the main controller 500 is further configured to calculate a difference value between the resistance threshold value and the insulation resistance value, and adjust an output power of the heating unit 400 and an output flow of the dehumidification unit 300 according to a size of the difference value.

[0064] In the present application, when the temperature value and / or the humidity value meets the first preset condition, i.e. the temperature value and / or the humidity value is abnormal, the insulation resistance value is further regularly judged to be abnormal. When the temperature value and / or the humidity value is abnormal, the heating unit 400 and the dehumidification unit 300 can be controlled to work; when the temperature value and / or the humidity value is abnormal and the insulation resistance value is abnormal, the output power of the heating unit 400 and the output flow of the dehumidification unit 300 are further adjusted according to an abnormal degree of the insulation resistance value. Through the monitoring system of the generator of the present application, the working environment of the stator of the generator can be monitored and controlled in real time, the temperature and the humidity are ensured to be kept in a suitable range, and the intensity of the heating and the dehumidification is adjusted according to the actual situation of the insulation resistance value, so as to protect the insulation performance of the generator and ensure the safe and stable operation of the equipment.

[0065] It should be noted that when any one of the temperature value and the humidity value is abnormal, the main controller 500 can control the heating unit 400 and the dehumidification unit 300 to work, and the subsequent regular detection of the insulation resistance value is performed.

[0066] In the embodiment of the present application, the temperature and humidity acquisition unit 100 is used to acquire the temperature value and humidity value of the working environment of the generator stator. Specifically, the temperature and humidity acquisition unit 100 includes a temperature sensor 100, a humidity sensor 120 and a display screen 130, the temperature sensor 100 is used to acquire the temperature value of the working environment of the generator stator, the humidity sensor 120 is used to acquire the humidity value of the working environment of the generator stator, and the temperature sensor 100, the humidity sensor 120 and the display screen 130 are respectively electrically connected with the main controller 500, and the main controller 500 is used to control the display screen 130 to display the temperature value, the humidity value and the insulation resistance value. Temperature and humidity change have a significant influence on the insulation resistance value, and the temperature and humidity detection module is arranged in the present application to acquire the temperature and humidity data of the working environment of the generator stator, so that the working environment can be improved in time and the insulation resistance value can be monitored when the temperature and humidity data are found to be abnormal.

[0067] For example, when the temperature and humidity detection module acquires the temperature and humidity data of the working environment of the generator stator, the temperature sensor 100 and the humidity sensor 120 can be located near the installation site of the generator to detect the temperature value and humidity value of the environment outside the generator as the temperature value and humidity value of the working environment of the generator stator; in other embodiments, the probes of the temperature sensor 100 and the humidity sensor 120 can be located close to the working site of the generator stator to improve the accuracy of the acquired temperature value and humidity value, and those skilled in the art can select according to the actual situation.

[0068] For example, the display screen 130 adopts a liquid crystal LCD display screen 130, and the temperature, humidity and insulation resistance value can be fed back in real time through the display screen 130, so that the operator can intuitively understand the current environmental conditions and insulation state.

[0069] In the embodiment of the present application, the insulation detection unit 200 is used to acquire the insulation resistance value of the generator stator. Specifically, the insulation detection unit 200 includes a three-phase commutation circuit 210 and a high-voltage insulation resistance value measurement circuit 220, the three-phase commutation circuit 210 is electrically connected with the wiring end of the generator stator, the high-voltage insulation resistance value measurement circuit 220 is electrically connected with the three-phase commutation circuit 210, and the three-phase commutation circuit 210 and the high-voltage insulation resistance value measurement circuit 220 are respectively connected with the main controller 500; when measuring the insulation resistance of the generator stator, the main controller 500 controls the three-phase commutation circuit 210 to connect the corresponding phase of the generator stator to the high-voltage insulation resistance value measurement circuit 220, so as to measure the insulation resistance value of the corresponding phase of the generator stator through the high-voltage insulation resistance value measurement circuit 220.

[0070] The high-voltage insulation resistance value measurement circuit applies a 5000V voltage excitation to the measured impedance, and calculates the impedance value based on Kirchhoff's law and Ohm's law. Meanwhile, the circuit structure is changed by using a multi-way switch selector to realize the measurement of resistance values from 200KΩ to 2GΩ. The three-phase commutation circuit 210 is used to connect the three phases of the generator stator to the high-voltage insulation resistance value measurement circuit, and to switch the charging and discharging states of the high-voltage insulation resistance value measurement circuit.

[0071] The collection of the insulation resistance value of the generator set is measured by the high-voltage insulation resistance value measurement circuit based on the principle of Wheatstone bridge. However, since the high-voltage insulation resistance value measurement circuit only has one pair of positive and negative measurement probes / terminals, and the stator of the generator has three phase lines and three corresponding ground lines, during the collection of the resistance value of a certain phase, the current single-phase line needs to be connected to the positive measurement probe of the high-voltage insulation resistance value measurement circuit, and the remaining two phase lines and ground lines need to be connected to the negative measurement probe.

[0072] For example, to realize the fast switching of the three-phase resistance measurement of the generator stator, refer to Figure 2 In the embodiment, a logic control of six groups of high-voltage relays 211 (i.e. relays L1-L6) is used to form the three-phase commutation circuit 210 to realize the automatic switching of the generator insulation resistance measurement mode. Specifically, the A, B, and C phases of the generator stator are connected to the relays L1, L2, and L3 respectively, and are connected to the positive pole of the high-voltage insulation resistance value measurement circuit through a hub. Similarly, the A, B, and C phases of the generator stator are connected to the relays L4, L5, and L6 respectively, and are connected to the negative pole of the high-voltage insulation resistance value measurement circuit through a hub. The negative pole of the high-voltage insulation resistance value measurement circuit is short-circuited with the three ground lines and grounded. When the inter-phase insulation resistance value of the A phase is sampled, the relays L1, L5, and L6 are closed, and the relays L2, L3, and L4 are opened, i.e. the A phase is connected to the positive pole, and the B and C phases are connected to the negative pole and grounded. When the inter-phase insulation resistance value of the B phase is sampled, the relays L2, L4, and L6 are closed, and the relays L1, L3, and L5 are opened, i.e. the B phase is connected to the positive pole, and the A and C phases are connected to the negative pole and grounded. When the inter-phase insulation resistance value of the C phase is sampled, the relays L3, L4, and L5 are closed, and the relays L1, L2, and L6 are opened, i.e. the C phase is connected to the positive pole, and the A and B phases are connected to the negative pole and grounded.

[0073] In the embodiment, in order to modularize the above circuit, the insulation detection unit 200 can also be configured with a control chip STM32F407ZET6, and the external communication and control can be realized through an RS232 serial port protocol. Those skilled in the art can make settings according to actual conditions.

[0074] In the embodiments of the present application, the polarization index and the absorption ratio are two parameters for evaluating the performance of the insulation system of the electrical equipment, the polarization index refers to the rate of change of the insulation resistance of the equipment with time at a specific voltage, and the absorption ratio refers to the ratio of the insulation resistance of the equipment at two different time points at a specific voltage, and the skilled person in the art can measure and record the absorption ratio, the polarization index and the like according to the actual situation.

[0075] In the embodiments of the present application, the heating unit 400 is used for heating the cabin of the generator, and the stator of the generator is located inside the cabin. Specifically, the heating unit 400 includes a plurality of heaters 410 arranged in an array, and the heaters 410 are electrically connected with the main controller 500. When the temperature value and / or the humidity value meet the first preset condition, and the insulation resistance value is lower than the resistance threshold value, the main controller 500 is further used for calculating the difference between the resistance threshold value and the insulation resistance value, and controlling the corresponding number of heaters 410 to work according to the size of the difference, so as to adjust the output power of the heating unit 400.

[0076] For example, sixteen 250W heaters 410 are arranged in the heating unit 400. By controlling the corresponding number of heaters 410 to work, the output power of the heating unit 400 is adjusted. Specifically, the larger the difference is, the more the number of heaters 410 started is, and the higher the output power is. The smaller the difference is, the less the number of heaters 410 started is, and the lower the output power is. In other embodiments, the number of heaters 410 can be set to other numbers, which can be set by the skilled person in the art according to the actual situation.

[0077] In the embodiments of the present application, the dehumidifying unit 300 is used for dehumidifying the cabin. Specifically, the dehumidifying unit 300 includes a valve 310, an actuator 320 and an air compressor 330. The actuator 320 is arranged on the valve 310 to open the valve 310. The air compressor 330 is connected with the valve 310, and is used for providing dry gas to the inside of the cabin through the valve 310. The actuator 320 and the air compressor 330 are connected with the main control, and the main controller 500 is used for controlling the air compressor 330 to work and controlling the valve 310 to be opened through the actuator 320 when the temperature value and / or the humidity value meet the first preset condition. When the temperature value or the humidity value meets the first preset condition, and the insulation resistance value is lower than the preset resistance threshold value, the main controller 500 is further used for calculating the difference between the resistance threshold value and the insulation resistance value, and controlling the actuator 320 to adjust the opening degree of the air passage inside the valve 310 according to the size of the difference, so as to adjust the output flow of the dehumidifying unit 300.

[0078] The actuator 320 can realize the opening degree of 0-100% of the air passage inside the valve 310. For example, the actuator 320 can include a servo motor and a mechanical transmission mechanism for converting the rotary motion of the servo motor into linear motion, which is a common technology in the art and will not be described here.

[0079] For example, the heater 410 is powered by AC 220V, and a PT100 temperature sensor is built in to monitor the temperature inside the heater 410 in real time. In the control of the heater 410, the application designs a self-locking and unlocking circuit between the heater 410 and the corresponding power supply of the heater 410, and uses a single-chip microcomputer to control the relay group 420 to realize the self-locking and unlocking of the relay group 420, so as to realize the start and stop of the heater 410. The valve 310 can adopt a high-pressure air valve with a specification of DN25.

[0080] In the application, the main controller 500 is used to set a plurality of different value ranges, and different value ranges correspond to different numbers of heaters 410 and different opening degrees of air passages; the main controller 500 is used to judge a difference value: when the difference value is in a certain value range, the main controller 500 controls a corresponding number of heaters 410 to work and controls the air passage to have a corresponding opening degree. For example, the main controller 500 can use STM32F407ZGT6 as the main control chip, or other models of chips can be used as the main control chip, which is not limited in the application.

[0081] For example, if the temperature value is lower than the temperature threshold value and / or the humidity value is higher than the humidity threshold value, the heater 410 is opened in four gears (i.e., four heaters 410 are controlled to work), and the actuator 320 controls the opening degree of the air passage of the valve 310 to be 25%. When the temperature value is lower than the temperature threshold value and / or the humidity value is higher than the humidity threshold value, the condition of the insulation resistance value is further judged. If the judgment result is that the insulation resistance value is lower than the resistance threshold value, the heater 410 array module opens four gears more for each 5% of the insulation threshold value that the insulation resistance value is lower than, and at the same time the actuator 320 controls the opening degree of the air passage of the valve 310 to increase by 25%, until the gears of the heater 410 and the opening degree of the air passage of the valve 310 are fully opened.

[0082] For example, when the difference value between the resistance threshold value and the insulation resistance value is in the first interval, four heaters 410 are controlled to work, and the opening degree of the air passage inside the valve 310 is adjusted to 25%. The first interval is 0 to N (N is the insulation threshold value multiplied by 5%).

[0083] When the difference value between the resistance threshold value and the insulation resistance value is in the second interval, eight heaters 410 are controlled to work, and the opening degree of the air passage inside the valve 310 is adjusted to 50%. The second interval is N+1 to 2N.

[0084] When the difference between the resistance threshold value and the insulation resistance value is in the third interval, the twelve heaters 410 are controlled to work, and the opening degree of the air passage inside the valve 310 is adjusted to 75%. The third interval is 2N+1 to 3N.

[0085] When the difference between the resistance threshold value and the insulation resistance value is in the fourth interval, the sixteen heaters 410 are controlled to work, and the opening degree of the air passage inside the valve 310 is adjusted to 100%. The fourth interval is 3N+1 to 4N.

[0086] The application can improve the working environment of the generator stator when the temperature and / or humidity are abnormal, and realize automatic management of the working environment of the generator stator. Meanwhile, the application can further judge the abnormal situation of the insulation resistance value when the temperature and / or humidity are abnormal, and adjust the output power of the heating unit 400 and the output flow of the dehumidifying unit 300 based on the abnormal situation of the insulation resistance value, which is beneficial to improve the improvement precision of the working environment of the generator stator.

[0087] In the embodiment of the application, the system further comprises an alarm unit 600, the alarm unit 600 is electrically connected with the main controller 500, and the main controller 500 is further used for controlling the alarm unit 600 to alarm when any one of the temperature value, the humidity value and the insulation resistance value meets a second preset condition; wherein the second preset condition comprises that the temperature value is lower than a preset temperature alarm threshold value, the humidity value is higher than a preset humidity alarm threshold value, and the insulation resistance value is lower than a preset resistance alarm threshold value.

[0088] For example, the alarm unit 600 comprises a loudspeaker 610 and / or a warning light 620. The alarm mode of sound and light combination can effectively alert the staff and remind the staff of the current state of the system. Those skilled in the art can also select other suitable alarm modes according to actual conditions.

[0089] For example, the alarm unit 600 can also sound and light alarm before the generator monitoring system starts monitoring, which can clear the field and ensure the safety of personnel. Those skilled in the art can set it according to actual conditions.

[0090] In the embodiment of the application, the system further comprises a man-machine interaction unit 700, the man-machine interaction unit 700 is electrically connected with the main controller 500, and the man-machine interaction unit 700 is used for generating and displaying a temperature curve, a humidity curve and an insulation resistance curve according to real-time temperature value, humidity value and insulation resistance value, and is further used for displaying and modifying the temperature threshold value, the humidity threshold value, the resistance threshold value, the temperature alarm threshold value, the humidity alarm threshold value and the resistance alarm threshold value.

[0091] The human-computer interaction unit 700 is mainly used for realizing parameter adjustment and related data review, wherein the human-computer interaction unit 700 is mainly divided into functions of basic parameter setting, insulation resistance value and temperature and humidity data acquisition, alarm threshold setting, intervention threshold (temperature threshold, humidity threshold and resistance threshold) setting and the like. Among them, the basic parameter setting is used for setting related system parameters, the insulation resistance value and temperature and humidity data acquisition can control the measurement of the system and the display of the measurement data and the like, the alarm threshold setting and the intervention threshold setting are respectively used for setting the alarm threshold and the intervention threshold, for realizing system alarm and automatic maintenance, and realizing intelligent measurement of the insulation resistance of the generator.

[0092] In the embodiment of the present application, the system can also be provided with a mobile terminal, the mobile terminal communicates with the main controller 500 in a wireless manner, and the mobile terminal can include functions of temperature value, humidity value and insulation resistance value display and the like. The functions of the mobile terminal can be set by the person skilled in the art according to the actual situation, and the specific description is not repeated.

[0093] In the embodiment of the present application, the system further includes an emergency stop unit 800, the emergency stop unit 800 is connected with the main controller 500, and when the main controller 500 receives an emergency stop signal sent by the emergency stop unit 800, the monitoring system of the generator is controlled to stop running. The principle of the emergency stop switch is to use a mechanism to disconnect the circuit, and rapidly cut off the power 900 at the moment of pressing the switch button. When an emergency occurs, the power 900 can be immediately cut off by pressing the emergency stop switch button, so as to protect the safety of personnel and equipment.

[0094] In the embodiment of the present application, the system further includes a power supply 900, the power supply 900 includes a 220V power supply and a 12V power supply 910, wherein the 220V power supply is connected with the 220V loudspeaker 610, and an air switch 930 is arranged on the line between the two; the 12V power supply 910 is used for supplying power to the main controller 500, the display screen 130, the temperature and humidity sensor 120, the three-color alarm lamp 620, the insulation detection unit 200 and the Internet of Things unit 1000. At the same time, in order to solve the problem of insufficient ports of the 12V power supply 910, the embodiment is also provided with a plurality of wiring terminal boards 920 for expanding the ports of the power supply 900.

[0095] In the embodiment of the present application, the system further comprises a cloud database for storing all data and user information for calling, and the following forms are created for this purpose. Data block: contains temperature and humidity data table, A-phase resistance value data table, B-phase resistance value data table, and C-phase resistance value data table. The data table is used to record monitoring data and corresponding monitoring time. The parameter setting block is respectively composed of a dangerous threshold (alarm threshold) data table, an intervention threshold (intervention threshold) data table, and a timing monitoring log recording data table. The timing monitoring log recording data table is used to set the time of the control system timing monitoring operation. Log block: includes timing monitoring log recording data table, system self-checking log recording data table and user operation log recording data table, mainly used to record the operation of the control system in the running process. User block: composed of user data table, containing user information and user rights. In order to control the safety of the system, a user management system is designed, which has three levels of user rights, for ROOT user, administrator, and ordinary user.

[0096] In the embodiment of the present application, the system further comprises an Internet unit, and the Internet of Things unit 1000 is used to upload the generator insulation resistance data detected by the insulation detection unit 200 and the temperature data and humidity data detected by the temperature and humidity detection unit to the main control module. In addition, through the Internet of Things unit 1000, the corresponding measurement data can also be transmitted to the cloud database for storage or calculation, and remote control can also be realized through the man-machine interaction system.

[0097] For example, the control chip of the Internet unit is an STM32F407 chip based on ARM architecture, which realizes network access with the Internet of Things card through an Air724UG communication module. The software layer adopts TCP / IP protocol to establish contact with the server through MQTT subscription function. On the hardware, AT instructions are used to configure GPRS function through Air724UG to realize calling, sending messages, connecting to the Internet and communicating with the server to realize lightweight Internet of Things function. Based on the MQTT publishing and subscribing model, in the case of supporting different types of minimum messages such as JSON and binary, only 2 bytes, it can be applied to resource-limited devices and low-bandwidth, high-latency or unstable network environments. The communication mode of the visual interface and the cloud system is mainly http and WebSocket, http is used to obtain data and send requests, and WebSocket is used to establish long connection with the server to receive the messages of the hardware end forwarded by the server in time.

[0098] The specific workflow of the application is as follows: the sampling instruction can be sent to the main controller 500 through the man-machine interaction unit 700, and the sampling instruction is manually sent by the user or sent by the control background at a fixed time; after the main controller 500 receives the sampling instruction, the temperature and humidity data are collected by controlling the temperature and humidity detection unit, and the generator insulation resistance value is sampled by controlling the insulation detection unit 200. The collected temperature value, humidity value and insulation resistance value are transmitted back to the main controller 500 through the Internet of Things unit 1000, and the main controller 500 uploads the collected data information to the cloud database for storage and outputs to the man-machine interaction unit 700. After the main controller 500 receives the data information, the data information is compared with the pre-set corresponding alarm threshold value, if the alarm threshold value is exceeded but not the intervention threshold value (temperature threshold value, humidity threshold value, resistance threshold value), only the speaker 610 and the alarm lamp are opened for alarm. If the temperature value is lower than the temperature threshold value and / or the humidity value is higher than the humidity threshold value, the heater 410 is opened in four gears (that is, the four heaters 410 are controlled to work), and the actuator 320 controls the opening of the air passage of the valve 310 to be 25%. When the temperature value is lower than the temperature threshold value and / or the humidity value is higher than the humidity threshold value, the condition of the insulation resistance value needs to be further judged, if the judgment result is that the insulation resistance value is lower than the resistance threshold value, then for every 5% that the insulation resistance value is lower than the insulation threshold value, the heater 410 array module opens four more gears, and at the same time the actuator 320 controls the opening of the air passage of the valve 310 to increase by 25%, until the gears of the heater 410 and the opening of the air passage of the valve 310 are fully opened.

[0099] The application also provides a generator monitoring method, comprising the following steps:

[0100] S1: collecting the temperature value and humidity value of the working environment of the generator stator;

[0101] S2: collecting the insulation resistance value of the generator stator;

[0102] S3: when the temperature value and / or humidity value meets the first preset condition, controlling the heating unit 400 and the dehumidification unit 300 to work; wherein the first preset condition includes that the temperature value is lower than the pre-set temperature threshold value, and the humidity value is higher than the pre-set humidity threshold value;

[0103] S4: when the temperature value or humidity value meets the first preset condition, and the insulation resistance value is lower than the pre-set resistance threshold value, calculating the difference between the resistance threshold value and the insulation resistance value, and adjusting the output power of the heating unit 400 and the output flow of the dehumidification unit 300 according to the size of the difference.

[0104] The application also provides a generator comprising a generator monitoring system as described above.

[0105] The above disclosed embodiments of the present application are only used to help explain the present application. The embodiments do not describe all of the details of the present application, and the present application is not limited to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the present specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A generator monitoring system, characterized in that, include: Temperature and humidity acquisition unit is used to collect the temperature and humidity values ​​of the working environment of the generator stator; An insulation detection unit is used to collect the insulation resistance value of the generator stator. A heating unit is used to heat the nacelle of the generator; A dehumidification unit is used to dehumidify the cabin. The main controller is electrically connected to the temperature and humidity acquisition unit, the insulation detection unit, the heating unit, and the dehumidification unit, respectively. When the temperature value and / or the humidity value meet a first preset condition, the main controller is used to control the operation of the heating unit and the dehumidification unit; wherein, the first preset condition includes: the temperature value is lower than a preset temperature threshold and the humidity value is higher than a preset humidity threshold; When the temperature value and / or the humidity value meet the first preset condition, and the insulation resistance value is lower than the preset resistance threshold, the main controller is further configured to calculate the difference between the resistance threshold and the insulation resistance value, and adjust the output power of the heating unit and the output flow rate of the dehumidification unit accordingly based on the magnitude of the difference.

2. The generator monitoring system according to claim 1, characterized in that, The heating unit includes multiple heaters arranged in an array, and the heaters are electrically connected to the main controller; When the temperature value and / or the humidity value meet the first preset condition, and the insulation resistance value is lower than the resistance threshold, the main controller is further configured to calculate the difference between the resistance threshold and the insulation resistance value, and control the corresponding number of heaters to work according to the magnitude of the difference, so as to adjust the output power of the heating unit.

3. The generator monitoring system according to claim 2, characterized in that, The dehumidification unit includes: valve; An actuator, disposed on the valve, is used to open the valve; An air compressor, connected to the valve, is used to supply dry gas into the cabin through the valve; The actuator and the air compressor are connected to the main controller, which is used to control the air compressor to work and control the valve to open through the actuator when the temperature value and / or the humidity value meet the first preset condition. When the temperature value and / or the humidity value meet the first preset condition, and the insulation resistance value is lower than the resistance threshold, the main controller is further configured to calculate the difference between the resistance threshold and the insulation resistance value, and control the actuator to adjust the opening of the air passage inside the valve according to the magnitude of the difference, so as to adjust the output flow of the dehumidification unit.

4. The generator monitoring system according to claim 3, characterized in that, The main controller is used to set multiple different numerical ranges, and different numerical ranges correspond to different numbers of heaters and different opening degrees of the air passages; The main controller is used to determine the difference: when the difference is within a certain range, the main controller controls the corresponding number of heaters to work and controls the air passage to the corresponding opening degree.

5. The generator monitoring system according to claim 1, characterized in that, The temperature and humidity acquisition unit includes: Temperature sensor, used to collect the temperature value of the working environment of the generator stator; A humidity sensor is used to collect the humidity value of the working environment of the generator stator; Display screen; The temperature sensor, the humidity sensor, and the display screen are electrically connected to the main controller, which controls the display screen to display the temperature value, the humidity value, and the insulation resistance value.

6. The generator monitoring system according to claim 1, characterized in that, The insulation detection unit includes: The three-phase commutation circuit is electrically connected to the terminals of the generator stator. The high-voltage insulation resistance measurement circuit is electrically connected to the three-phase commutation circuit. The three-phase commutation circuit and the high-voltage insulation resistance measurement circuit are respectively connected to the main controller. When measuring the insulation resistance of the generator stator, the main controller controls the three-phase commutation circuit to connect the corresponding phase of the generator stator to the high-voltage insulation resistance measurement circuit so as to measure the insulation resistance value of the corresponding phase of the generator stator through the high-voltage insulation resistance measurement circuit.

7. The generator monitoring system according to claim 1, characterized in that, The system also includes an alarm unit, which is connected to the main controller; When any one of the temperature value, the humidity value, and the insulation resistance value meets the second preset condition, the main controller is also used to control the alarm unit to sound an alarm. The second preset condition includes: the temperature value is lower than a preset temperature alarm threshold, the humidity value is higher than a preset humidity alarm threshold, and the insulation resistance value is lower than a preset resistance alarm threshold.

8. The generator monitoring system according to claim 7, characterized in that, The alarm unit includes a speaker and / or an alarm light.

9. The generator monitoring system according to claim 8, characterized in that, The system also includes a human-machine interaction unit, which is electrically connected to the main controller. The human-machine interaction unit is used to generate and display the temperature curve, humidity curve, and insulation resistance curve based on the real-time temperature value, humidity value, and insulation resistance value, respectively. The human-machine interaction unit is also used to display and modify the temperature threshold, humidity threshold, resistance threshold, temperature alarm threshold, humidity alarm threshold, and resistance alarm threshold.

10. The generator monitoring system according to claim 1, characterized in that, The system also includes an emergency stop unit connected to the main controller. When the main controller receives an emergency stop signal from the emergency stop unit, it controls the monitoring system of the generator to stop operating.

11. A method for monitoring a generator, characterized in that, Includes the following steps: Collect the temperature and humidity values ​​of the generator stator's operating environment; Collect the insulation resistance value of the generator stator; When the temperature value and / or the humidity value meet a first preset condition, the heating unit and the dehumidification unit are controlled to operate; wherein, the first preset condition includes: the temperature value is lower than a temperature threshold and the humidity value is higher than a humidity threshold; When the temperature value and / or the humidity value meet the first preset condition, and the insulation resistance value is lower than the preset resistance threshold, the difference between the resistance threshold and the insulation resistance value is calculated, and the output power of the heating unit and the output flow rate of the dehumidification unit are adjusted accordingly based on the magnitude of the difference.

12. A generator, characterized in that, The monitoring system includes any one of claims 1-10.

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