Generator monitoring system and method, and generator

Abstract

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

Description

Technical Field

[0001] The present invention relates to the technical field of generator monitoring, and in particular to a generator monitoring system, method and generator. Background Art

[0002] Insulation resistance is the most basic insulation index in electrical equipment and electrical lines. Generator stator insulation testing is an important part of ensuring safe and reliable operation of the generator. The performance of stator insulation directly affects the efficiency, life and safety of the generator. Generator insulation management during the installation phase is crucial to ensure the safety and quality of the power generation, transmission and transformation system of the power plant. The insulation performance of the generator stator will degrade with the influence of environmental changes such as temperature and humidity on site, and may even lead to eventual failure. Therefore, regular confirmation of the insulation level of the generator is an important parameter to ensure the quality of the generator during installation.

[0003] Temperature and humidity have a significant impact on the insulation resistance value of the generator. They will directly affect the performance of the insulating material, and then affect the insulation resistance value of the generator. At present, the intelligent monitoring system of the insulation resistance of the generator can only measure the insulation resistance data, and lacks automated management of the working environment of the generator stator. Summary of the invention

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

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention provides a monitoring system for a generator, comprising: a temperature and humidity acquisition unit, for acquiring temperature and humidity values ​​of a working environment of a generator stator;

[0007] An insulation detection unit, used for collecting the insulation resistance value of the generator stator;

[0008] A heating unit, used for heating the engine room of the generator;

[0009] a dehumidification unit, used for dehumidifying the cabin;

[0010] A 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 meets a first preset condition, the main controller is used to control the heating unit and the dehumidification unit to work; wherein the first preset condition includes: the temperature value is lower than a preset temperature threshold value, and the humidity value is higher than a preset humidity threshold value;

[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, the main controller is also used 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 of the dehumidification unit accordingly according to the size of the difference.

[0012] In one embodiment of the present invention, the dehumidification unit comprises:

[0013] valve;

[0014] An actuator, disposed on the valve to open the valve;

[0015] an air compressor connected to the valve and used to provide dry gas to the interior of the cabin through the valve;

[0016] The actuator and the air compressor are connected to the main controller, and the main controller 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 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, the main controller is also used to calculate the difference between the resistance threshold and the insulation resistance value, and control the actuator to adjust the opening of the air channel inside the valve according to the size of the difference to adjust the output flow of the dehumidification unit.

[0018] In one embodiment of the present invention, the main controller is used to set a plurality of different numerical ranges, and different numerical ranges correspond to different numbers of the heaters and different openings of the air passages;

[0019] The main controller is used to determine the difference: when the difference is within a certain value range, the main controller controls a corresponding number of heaters to operate and controls the air passage to a corresponding opening degree.

[0020] In one embodiment of the present invention, the temperature and humidity acquisition unit includes:

[0021] A temperature sensor, used to collect the temperature value of the working environment of the generator stator;

[0022] A humidity sensor, used to collect the humidity value of the working environment of the generator stator;

[0023] Display screen;

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

[0025] In one embodiment of the present invention, the insulation detection unit includes:

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

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

[0028] The three-phase commutation circuit and the high-voltage insulation resistance value 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 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 one embodiment of the present invention, the system further comprises an alarm unit, and the alarm unit is connected to 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 used to control the alarm unit to alarm;

[0031] 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.

[0032] In an embodiment of the present invention, the alarm unit includes a speaker and / or an alarm light.

[0033] In one embodiment of the present invention, the system also includes a human-computer interaction unit, which is electrically connected to the main controller. The human-computer interaction unit is used to generate and display the temperature curve graph, humidity curve graph and insulation resistance curve graph according to the real-time temperature value, humidity value and insulation resistance value, respectively. The human-computer 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.

[0034] In one embodiment of the present invention, the system further comprises an emergency stop unit, which is connected to the main controller. 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 present application also provides a method for monitoring a generator, comprising the following steps:

[0036] Collect the temperature and humidity values ​​of the working environment of the generator stator;

[0037] Collecting the insulation resistance value of the generator stator;

[0038] When the temperature value and / or the humidity value meets a first preset condition, the heating unit and the dehumidification unit are controlled to work; wherein the first preset condition includes: the temperature value is lower than the temperature threshold value, and the humidity value is higher than the humidity threshold value;

[0039] 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, 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 of the dehumidification unit are adjusted accordingly according to the size of the difference.

[0040] The present application also provides a generator, including a monitoring system for the generator as described above.

[0041] As described above, the present invention provides a monitoring system for a generator, which 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; at the same time, the present 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 and the output flow of the dehumidification unit in a targeted manner based on the abnormal situation of the insulation resistance value, which is beneficial to improving the improvement accuracy of the working environment of the generator stator.

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

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0044] Figure 1 It is a schematic diagram of the principle of a monitoring system for a generator in one embodiment of the present invention;

[0045] Figure 2 A circuit diagram of a three-phase commutation circuit of a generator monitoring system according to an embodiment of the present invention;

[0046] Figure 3A schematic diagram of the structure of a generator monitoring device of a generator monitoring system according to an embodiment of the present invention;

[0047] Figure 4 It is a structural schematic diagram of a heating unit of a monitoring system for a generator in one embodiment of the present invention;

[0048] Figure 5 It is a schematic diagram of the structure of the actuator of the monitoring system of the generator in one embodiment of the present invention;

[0049] Figure 6 Schematic diagram of a flow chart of a method for monitoring a generator in one embodiment of the present invention.

[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 light;

[0057] 700-Human-computer interaction unit;

[0058] 800-Emergency stop unit;

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

[0060] 1000-IoT unit. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] See attached Figure 1-6A monitoring system for a generator according to the first embodiment of the present application is exemplarily described. The monitoring system for a generator includes 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 used to collect the temperature and humidity values ​​of the working environment of the generator stator; the insulation detection unit 200 is used to collect the insulation resistance value of the generator stator; the heating unit 400 is used to heat the cabin of the generator; the dehumidification unit 300 is used to dehumidify the cabin; the main controller 500 is electrically connected to 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 the first preset condition, the main controller 500 is used to control the heating unit 400 and the dehumidification unit 300 to work; wherein the first preset condition includes: the temperature value is lower than the preset temperature threshold, and the humidity value is higher than the preset humidity threshold; 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, the main controller 500 is also used to calculate the difference between the resistance threshold and the insulation resistance value, and adjust the output power of the heating unit 400 and the output flow of the dehumidification unit 300 according to the size of the difference.

[0064] When the temperature value and / or humidity value meet the first preset condition, that is, when the temperature value and / or humidity value are abnormal, the present application routinely determines whether the insulation resistance value is abnormal. When the temperature value and / or humidity value are abnormal, the heating unit 400 and the dehumidification unit 300 can be controlled to work; when the temperature value and / or humidity value are 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 the abnormal degree of the insulation resistance value. The monitoring system of the generator of the present application can monitor and control the working environment of the generator stator in real time to ensure that the temperature and humidity are kept within the appropriate range, and at the same time adjust the intensity of heating and dehumidification 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 in the present application is abnormal, the main controller 500 can control the heating unit 400 and the dehumidification unit 300 to operate, and perform subsequent routine detection of the insulation resistance value.

[0066] In the embodiment of the present application, the temperature and humidity acquisition unit 100 is used to collect the temperature and humidity values ​​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 collect the temperature value of the working environment of the generator stator. The humidity sensor 120 is used to collect the humidity value of the working environment of the generator stator. The temperature sensor 100, the humidity sensor 120 and the display screen 130 are electrically connected to the main controller 500 respectively, and the main controller 500 is used to control the display screen 130 to display the temperature value, humidity value and insulation resistance value. Temperature and humidity changes have a significant impact on the insulation resistance value. The temperature and humidity detection module set in the present application can collect the temperature and humidity data of the working environment of the generator stator. When the temperature and humidity data are found to be abnormal, it is convenient to improve the working environment in time and monitor the insulation resistance value.

[0067] For example, when the temperature and humidity detection module collects 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 and humidity values ​​of the environment outside the generator as the temperature and humidity values ​​of the working environment of the generator stator; in some other embodiments, the probes of the temperature sensor 100 and the humidity sensor 120 can be located close to the working location of the generator stator to improve the accuracy of the acquired temperature and humidity values, and technicians in this field can choose according to actual conditions.

[0068] For example, the display screen 130 is a liquid crystal LCD display screen 130 , through which the temperature, humidity and insulation resistance value can be fed back instantly, so that the operator can intuitively understand the current environmental conditions and insulation status.

[0069] In the embodiment of the present application, the insulation detection unit 200 is used to collect 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 to the terminal of the generator stator, and the high-voltage insulation resistance value measurement circuit 220 is electrically connected to the three-phase commutation circuit 210, wherein the three-phase commutation circuit 210 and the high-voltage insulation resistance value measurement circuit 220 are respectively connected to 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, calculates the impedance value based on Kirchhoff's law and Ohm's law, and uses a multi-way switch selector to change the circuit structure to achieve 200KΩ-2GΩ resistance measurement. The three-phase switching circuit 210 is used to connect the three phases of the generator stator to the high-voltage insulation resistance value measurement circuit respectively, and to achieve the charging and discharging state switching of the high-voltage insulation resistance value measurement circuit.

[0071] The insulation resistance value of the generator set is collected through a high-voltage insulation resistance measurement circuit based on the Wheatstone bridge principle. However, since the high-voltage insulation resistance measurement circuit has only one pair of positive and negative measuring probes / terminals, and the stator of the generator has three-phase lines and their corresponding three ground wires, in the process of collecting the resistance of a certain phase, the current single-phase line needs to be connected to the positive measuring probe of the high-voltage insulation resistance measurement circuit, and the remaining two phase lines and the ground wire need to be connected to the negative measuring probe at the same time.

[0072] For example, to achieve fast switching of the three-phase resistance measurement of the generator stator, see Figure 2 In this embodiment, the logic control of 6 groups of high-voltage relays 211 (i.e., relay L1-relay L6) is used to form a three-phase switching circuit 210 to realize the automatic switching of the generator insulation resistance measurement mode, wherein the three phases A, B, and C of the generator stator are respectively connected to relay L1, relay L2, and relay L3, and are uniformly connected to the positive pole of the high-voltage insulation resistance value measurement circuit through a hub. Similarly, the three phases A, B, and C of the generator stator are respectively connected to relay L4, relay L5, and relay L6, and are uniformly connected to the negative pole of the high-voltage insulation resistance value measurement circuit through a hub, and the negative pole of the high-voltage insulation resistance value measurement circuit is short-circuited with three ground wires and grounded. When sampling the insulation resistance value between phases of phase A, relay L1, relay L5, and relay L6 are closed, and relay L2, relay L3, and relay L4 are disconnected, that is, phase A is connected to the positive pole, and phases B and C are connected to the negative pole and grounded; when sampling the insulation resistance value between phases of phase B, relay L2, relay L4, and relay L6 are closed, and relay L1, relay L3, and relay L5 are disconnected, that is, phase B is connected to the positive pole, and phases A and C are connected to the negative pole and grounded; when sampling the insulation resistance value between phases of phase C, relay L3, relay L4, and relay L5 are closed, and relay L1, relay L2, and relay L6 are disconnected, that is, phase C is connected to the positive pole, and phases A and B are connected to the negative pole and grounded.

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

[0074] In the embodiments of the present application, polarization index and absorption ratio are two parameters used to evaluate the performance of the insulation system of electrical equipment. Polarization index refers to the rate of change of the insulation resistance of the measured equipment over time under a specific voltage. Absorption ratio refers to the ratio of the insulation resistance of the measured equipment at two different time points under a specific voltage. Technical personnel in this field can measure and record data such as absorption ratio and polarization index according to actual conditions.

[0075] In the embodiment of the present application, the heating unit 400 is used to heat the cabin of the generator, and the generator stator 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 to 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, the main controller 500 is also used to calculate the difference between the resistance threshold and the insulation resistance value, and control 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 provided in the heating unit 400, and the output power of the heating unit 400 is adjusted by controlling the corresponding number of heaters 410 to work. Specifically, the larger the difference, the more heaters 410 are started, and the higher the output power is, and the smaller the difference, the fewer heaters 410 are started, and the lower the output power is. In some other embodiments, the number of heaters 410 can be set to other numbers, and those skilled in the art can set it according to actual conditions.

[0077] In the embodiment of the present application, the dehumidification unit 300 is used to dehumidify the cabin. Specifically, the dehumidification 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 to the valve 310 and is used to provide dry gas to the cabin through the valve 310. The actuator 320 and the air compressor 330 are connected to the main control. The main controller 500 is used to control the air compressor 330 to work and control the valve 310 to open 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, the main controller 500 is also used to calculate the difference between the resistance threshold and the insulation resistance value, and control the actuator 320 to adjust the opening of the air channel inside the valve 310 according to the size of the difference, so as to adjust the output flow of the dehumidification unit 300.

[0078] The actuator 320 can achieve a 0-100% opening of the air passage inside the valve 310. For example, the actuator 320 may include a servo motor and a mechanical transmission mechanism, the mechanical transmission mechanism is used to convert the rotational motion of the servo motor into linear motion, and the mechanical transmission mechanism 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 has a built-in PT100 temperature sensor, which can be used to monitor the temperature inside the heater 410 in real time. In terms of the control of the heater 410, the present application designs a self-locking and unlocking circuit between the heater 410 and the power supply corresponding to the heater 410, and uses a single-chip microcomputer to control the relay group 420 to achieve self-locking and unlocking of the relay group 420, thereby realizing the start and stop of the heater 410. The valve 310 can be a high-pressure air valve with a specification of DN25.

[0080] In the present application, the main controller 500 is used to set a plurality of different numerical ranges, and different numerical ranges correspond to different numbers of heaters 410 and different openings of the air channel; the main controller 500 is used to judge the difference: when the difference is within a certain numerical range, the main controller 500 controls the corresponding number of heaters 410 to work, and controls the air channel to a corresponding opening. For example, the main controller 500 can use STM32F407ZGT6 as the main control chip, or other types of chips as the main control chip, and this application does not make specific restrictions.

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

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

[0083] When the difference between the resistance threshold and the insulation resistance value is in the second interval, the eight heaters 410 are controlled to work, and the opening 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 and the insulation resistance value is within the third interval, the twelve heaters 410 are controlled to work, and the opening 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 and the insulation resistance value is within the fourth interval, the sixteen heaters 410 are controlled to work, and the opening of the air passage inside the valve 310 is adjusted to 100%. The fourth interval is 3N+1 to 4N.

[0086] The present application can improve the working environment of the generator stator when the temperature and / or humidity are abnormal, and realize the automatic management of the working environment of the generator stator; at the same time, the present 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 dehumidification unit 300 in a targeted manner based on the abnormal situation of the insulation resistance value, which is beneficial to improve the improvement accuracy of the working environment of the generator stator.

[0087] In an embodiment of the present application, the system also includes an alarm unit 600, which is electrically connected to the main controller 500. When any one of the temperature value, humidity value and insulation resistance value meets the second preset condition, the main controller 500 is also used to control the alarm unit 600 to alarm; wherein the second preset condition includes: the temperature value is lower than the preset temperature alarm threshold, the humidity value is higher than the preset humidity alarm threshold, and the insulation resistance value is lower than the preset resistance alarm threshold.

[0088] For example, the alarm unit 600 includes a speaker 610 and / or an alarm light 620. The combination of sound and light alarm can effectively warn the staff and remind them of the current state of the system. Those skilled in the art can also select other appropriate alarm methods according to actual conditions.

[0089] For example, the alarm unit 600 can also make an audible and visual alarm before the generator monitoring system starts monitoring work, so as to clear the site and ensure the safety of personnel. Those skilled in the art can make settings according to actual conditions.

[0090] In an embodiment of the present application, the system also includes a human-computer interaction unit 700, which is electrically connected to the main controller 500. The human-computer interaction unit 700 is used to generate and display a temperature curve graph, a humidity curve graph, and an insulation resistance curve graph according to real-time temperature values, humidity values, and insulation resistance values, respectively. The human-computer interaction unit 700 is also used to display and modify temperature thresholds, humidity thresholds, resistance thresholds, temperature alarm thresholds, humidity alarm thresholds, and resistance alarm thresholds.

[0091] The human-machine interaction unit 700 is mainly used to realize parameter adjustment and related data review. Among them, the human-machine interaction unit 700 is mainly divided into basic parameter setting, insulation resistance value and temperature and humidity data collection, alarm threshold setting, intervention threshold (temperature threshold, humidity threshold and resistance threshold) setting and other functions. Among them, the basic parameter setting is used to set relevant system parameters, the insulation resistance value and temperature and humidity data collection can control the measurement of the system and the display of the measurement data, etc. The alarm threshold setting and intervention threshold setting respectively set the alarm threshold and intervention threshold, which are used to realize system alarm and automatic maintenance, and realize the intelligent measurement of the insulation resistance of the generator.

[0092] In the embodiment of the present application, the system may also be provided with a mobile terminal, which communicates with the main controller 500 by wireless means, and the mobile terminal may include functions such as displaying temperature values, humidity values, and insulation resistance values. Those skilled in the art may set the functions of the mobile terminal according to actual conditions, and the specific details will not be repeated.

[0093] In the embodiment of the present application, the system further includes an emergency stop unit 800, which is connected to the main controller 500. When the main controller 500 receives an emergency stop signal sent by the emergency stop unit 800, the monitoring system controlling the generator stops running. The principle of the emergency stop switch is to use a circuit-breaking mechanism to quickly cut off the power supply 900 at the moment the switch button is pressed. When an emergency occurs, the power supply 900 can be immediately cut off by simply pressing the emergency stop switch button to protect the safety of personnel and equipment.

[0094] In the embodiment of the present application, the system further includes a power supply 900, which includes a 220V power supply and a 12V power supply 910, wherein the 220V power supply is connected to the 220V speaker 610, and an air switch 930 is provided on the line between the two; the 12V power supply 910 is used to power the main controller 500, the display screen 130, the temperature and humidity sensor 120, the three-color alarm light 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 present embodiment is also equipped with a plurality of terminal blocks 920 for expanding the ports of the power supply 900.

[0095] In an embodiment of the present application, the system also includes a cloud database, which is used to store all data and user information for call, and the following forms are created for this purpose. Data section: Contains temperature and humidity data table, A phase resistance data table, B phase resistance data table, and C phase resistance data table. The data form is used to record monitoring data and the corresponding monitoring time. The parameter setting section is composed of a danger threshold (alarm threshold) data table, an intervention threshold (intervention threshold) data table, and a timed monitoring log record data table. The timed monitoring log record data table is used to set the time for the control system to monitor the operation. Log section: includes a timed monitoring log record data table, a system self-test log record data table, and a user operation log record data table, which is mainly used to record the operations performed by the control system during operation. User section: It is composed of user data tables, containing user information and user permissions. In order to control the security of the system, a user management system is designed with three levels of user permissions, namely ROOT users, administrators, and ordinary users.

[0096] In the embodiment of the present application, the system further includes 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, the Internet of Things unit 1000 can also realize the transmission of the corresponding measurement data to the cloud database for storage or calculation, and remote control can also be realized through the human-computer interaction system.

[0097] For example, the control chip of the Internet unit is an STM32F407 chip based on the ARM architecture, and the Air724UG communication module and the Internet of Things card are used to access the network. The software layer uses the TCP / IP protocol to establish a connection with the server through the MQTT subscription function. In terms of hardware, the Air724UG uses AT commands to configure the GPRS function to realize calling, sending text messages, connecting to the Internet and communicating with the server to realize lightweight Internet of Things functions. Based on the MQTT publish-subscribe model, it can be applied to resource-constrained devices and low-bandwidth, high-latency or unstable network environments while supporting different types of minimum messages such as JSON and binary with only 2 bytes. The communication methods between the visual interface and the cloud system are mainly http and WebSocket. http is used to obtain data and send requests, while WebSocket is used to establish a long connection with the server to receive messages from the hardware side forwarded by the server in a timely manner.

[0098] The specific workflow of this application is as follows: a sampling instruction can be sent to the main controller 500 through the human-computer interaction unit 700, and the sampling instruction is sent manually by the user or sent regularly by the control background; after receiving the sampling instruction, the main controller 500 controls the temperature and humidity detection unit to collect temperature and humidity data, and controls the insulation detection unit 200 to sample the insulation resistance value of the generator. 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 it to the human-computer interaction unit 700. After receiving the data information, the main controller 500 first compares the data information with the corresponding preset alarm threshold. If it exceeds the alarm threshold but does not exceed the intervention threshold (temperature threshold, humidity threshold, resistance threshold), only the speaker 610 and the alarm light are turned on to alarm. If the temperature value is lower than the temperature threshold and / or the humidity value is higher than the humidity threshold, the heater 410 opens four gears (that is, controls the four heaters 410 to work), and the actuator 320 controls the opening of the air channel of the valve 310 to be 25%. When the temperature value is lower than the temperature threshold and / or the humidity value is higher than the humidity threshold, it is necessary to further judge the insulation resistance value. If the judgment result is that the insulation resistance value is lower than the resistance threshold, then for every 5% that the insulation resistance value is lower than the insulation threshold, the heater 410 array module opens four more gears, and at the same time, the actuator 320 controls the opening of the air channel of the valve 310 to increase by 25%, until the gear of the heater 410 and the opening of the air channel of the valve 310 are fully opened.

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

[0100] S1: Collect the temperature and humidity values ​​of the working environment of the generator stator;

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

[0102] S3: When the temperature value and / or the humidity value meets the first preset condition, the heating unit 400 and the dehumidification unit 300 are controlled to work; wherein the first preset condition includes: the temperature value is lower than a preset temperature threshold value, and the humidity value is higher than a preset 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 preset resistance threshold, the difference between the resistance threshold and the insulation resistance value is calculated, and the output power of the heating unit 400 and the output flow of the dehumidification unit 300 are adjusted accordingly according to the size of the difference.

[0104] The present application also provides a generator, including a monitoring system for the generator as described above.

[0105] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A generator monitoring system, characterized in that: include: A 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, used for collecting the insulation resistance value of the generator stator; A heating unit, used for heating the engine room of the generator; a dehumidification unit, used for dehumidifying the cabin; A main controller, 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 meets a first preset condition, the main controller is used to control the heating unit and the dehumidification unit to work; 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 meets the first preset condition and the insulation resistance value is lower than the preset resistance threshold, the main controller is also used 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 of the dehumidification unit accordingly according to the size of the difference.

2. The generator monitoring system according to claim 1, characterized in that: The heating unit comprises a plurality of heaters arranged in an array, and the heaters are electrically connected to the main controller; 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, the main controller is also used to calculate the difference between the resistance threshold and the insulation resistance value, and control a corresponding number of the heaters to operate according to the size of the difference to adjust the output power of the heating unit.

3. The generator monitoring system according to claim 2, characterized in that: The dehumidification unit comprises: valve; An actuator, disposed on the valve to open the valve; an air compressor connected to the valve and used to provide dry gas to the interior of the cabin through the valve; The actuator and the air compressor are connected to the main controller, and the main controller 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 meets the first preset condition; 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, the main controller is also used to calculate the difference between the resistance threshold and the insulation resistance value, and control the actuator to adjust the opening of the air channel inside the valve according to the size of the difference 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 a plurality of different numerical ranges, and different numerical ranges correspond to different numbers of the heaters and different openings of the air passages; The main controller is used to determine the difference: when the difference is within a certain value range, the main controller controls a corresponding number of heaters to operate and controls the air passage to a corresponding opening degree.

5. The generator monitoring system according to claim 1, characterized in that: The temperature and humidity acquisition unit comprises: A temperature sensor, used to collect the temperature value of the working environment of the generator stator; A humidity sensor, 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 respectively, and the main controller is used to control 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 comprises: A three-phase commutation circuit electrically connected to the terminal of the generator stator; A high-voltage insulation resistance value measuring circuit is electrically connected to the three-phase commutation circuit; The three-phase commutation circuit and the high-voltage insulation resistance value 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 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.

7. The generator monitoring system according to claim 1, characterized in that: The system further comprises an alarm unit, wherein the alarm unit is connected to the main controller; 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 used to control the alarm unit to 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-computer interaction unit, which is electrically connected to the main controller. The human-computer interaction unit is used to generate and display the temperature curve graph, humidity curve graph and insulation resistance curve graph according to the real-time temperature value, humidity value and insulation resistance value, respectively. The human-computer 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 further comprises an emergency stop unit, which is connected to the main controller. 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.

11. A method for monitoring a generator, characterized in that: The following steps are involved: Collect the temperature and humidity values ​​of the working environment of the generator stator; Collecting the insulation resistance value of the generator stator; When the temperature value and / or the humidity value meets a first preset condition, the heating unit and the dehumidification unit are controlled to work; wherein the first preset condition includes: the temperature value is lower than the temperature threshold value, and the humidity value is higher than the 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 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 of the dehumidification unit are adjusted accordingly according to the size of the difference.

12. A generator, characterized in that: A generator monitoring system comprising the generator monitoring system according to any one of claims 1 to 10.

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