Electrical fault monitoring device, electrical system and wind generating set

Abstract

The utility model provides an electrical fault monitoring device, an electrical system and a wind generating set, the electrical fault monitoring device is used for monitoring faults of the electrical system, the electrical system comprises a to-be-monitored element, the electrical fault monitoring device comprises an electrical sensor connected with the to-be-monitored element, and the electrical sensor is used for collecting electrical signals of the to-be-monitored element; the fault diagnosis element is connected with the electrical sensor, and the fault diagnosis element is used for performing fault diagnosis on the element to be monitored according to the collected electrical signal; and the communication interface is in communication connection with a main controller of the electrical system. According to the invention, the element specially used for executing the fault diagnosis is configured, the independent fault diagnosis is realized according to the electrical signal collected by the electrical sensor, the fault diagnosis and the fault protection can be separated, the calculation load of the main controller can be shared, the CPU occupancy rate can be released, and the control efficiency of the whole machine can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of wind power generation, and more particularly, to an electrical fault monitoring device, an electrical system, and a wind turbine generator set. Background Art

[0002] The yaw system of a wind turbine is a device that controls the rotation direction of the turbine blades. It typically consists of a yaw motor, a controller, sensors, and an actuator. The controller controls the rotation of the yaw motor and actuator to control the blade rotation direction. The yaw system automatically adjusts the blades according to wind direction, ensuring they always face the wind, thereby improving wind energy utilization efficiency.

[0003] In order to ensure the reliable operation of the yaw system, it is usually necessary to monitor the yaw motor for faults. Existing monitoring methods usually include two categories, one is implemented using electrical hardware, and the other is implemented by collecting and analyzing the electrical signals (such as current) of the yaw motor. Although the latter has the advantages of not requiring installation space for electrical hardware and fast response speed, when using electrical signals for fault monitoring, the existing method is usually to uniformly collect the electrical signals of each yaw motor, and then hand them all over to the unit's main controller for fault diagnosis, determination of fault protection strategies, and execution of strategy actions, resulting in a large amount of computing resources occupied by the main controller, affecting the control efficiency of the unit and hindering the implementation of such methods. Utility Model Content

[0004] Therefore, it is crucial to improve the control efficiency of the unit while reducing the use of electrical hardware to implement motor fault monitoring.

[0005] In a general aspect, an electrical fault monitoring device is provided for monitoring faults in an electrical system, wherein the electrical system includes a component to be monitored, and the electrical fault monitoring device includes: an electrical sensor connected to the component to be monitored, the electrical sensor being used to collect electrical signals from the component to be monitored; a fault diagnosis element connected to the electrical sensor, the fault diagnosis element being used to perform fault diagnosis on the component to be monitored based on the collected electrical signals; and a signal output element connected to the fault diagnosis element for outputting a fault signal.

[0006] Optionally, the number of the components to be monitored is at least one, and each component to be monitored is connected to at least one electrical sensor; the number of the fault diagnosis components is equal to the number of the components to be monitored and they are arranged in a one-to-one correspondence, and each fault diagnosis component is connected to the electrical sensor connected to the corresponding component to be monitored.

[0007] Optionally, the electrical sensor includes at least one of the following: a current sensor and a temperature sensor.

[0008] Optionally, the signal output element includes at least one of the following: a hardware device, an optical element.

[0009] Optionally, the electrical fault monitoring device further includes: a communication interface, which is communicatively connected to a main controller of the electrical system.

[0010] Optionally, the electrical fault monitoring device also includes: a processing element connected to the signal output element and the communication interface, the processing element being used to determine a fault protection strategy based on the fault signal output by the signal output element, and sending the fault protection strategy to the main controller via the communication interface.

[0011] Optionally, the electrical fault monitoring device further includes: an integrated circuit board, and the electrical sensor, the fault diagnosis element and the communication interface are arranged on the integrated circuit board.

[0012] Optionally, the electrical fault monitoring device further comprises: a shell, a receiving cavity is formed inside the shell, and the integrated circuit board is located in the receiving cavity.

[0013] In another general aspect, an electrical system is provided, comprising: a component to be monitored; and the electrical fault monitoring device as described above.

[0014] Optionally, the component to be monitored includes a motor.

[0015] Optionally, the electrical system includes a yaw system of a wind turbine generator set; and the component to be monitored includes a yaw motor.

[0016] In another general aspect, a wind turbine generator set is provided, comprising: the electrical fault monitoring device as described above; or the electrical system as described above.

[0017] The present disclosure proposes an electrical fault monitoring device, an electrical system, and a wind turbine generator set. Based on the use of digital analysis of electrical signals to replace fault monitoring electrical hardware, the present disclosure configures components specifically for performing fault diagnosis, and implements independent fault diagnosis based on the electrical signals collected by electrical sensors. This can separate fault diagnosis from fault protection, share the computing load of the main controller, release CPU occupancy, and improve the control efficiency of the entire machine. At the same time, the use of signal output components to output fault signals representing the diagnosis results can ensure that the main controller is aware of the fault diagnosis results in a timely manner, thereby ensuring the reliable operation of the electrical system. In addition, the present disclosure integrates electrical signal acquisition, fault analysis, and fault signal output into one, which can improve the overall structural reliability and facilitate the installation of the device.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects and features of the present invention will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a topological diagram illustrating an electrical fault monitoring device and an electrical system according to an embodiment of the present disclosure;

[0021] Figure 2 FIG. 4 is a topological diagram illustrating an electrical fault monitoring device according to a specific embodiment of the present disclosure.

[0022] Figure 1 Description of Figure Numbers:

[0023] 10: Electrical fault monitoring device; 11: Electrical sensor; 12: Fault diagnosis element; 13: Processing element; 20: Component to be monitored; 30: Main controller. DETAILED DESCRIPTION

[0024] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be clear after understanding the disclosure of the present application. For example, the order of operations described herein is merely an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present application, except for operations that must occur in a specific order. In addition, for greater clarity and conciseness, descriptions of features known in the art may be omitted.

[0025] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will become clear after understanding the disclosure of this application.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.

[0027] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions should not be limited by these terms. Instead, these terms are used solely to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, what is referred to as a first member, first component, first region, first layer, or first portion in the examples described herein may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.

[0028] In the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present therebetween. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there may be no other elements present therebetween.

[0029] The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" indicate the presence of the recited features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0030] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure pertains after understanding the present disclosure. Unless expressly defined otherwise herein, terms (such as those defined in general dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal manner.

[0031] Furthermore, in describing the examples, when it is deemed that a detailed description of well-known related structures or functions would cause ambiguous interpretation of the present disclosure, such detailed description will be omitted.

[0032] The following will be combined Figure 1 and Figure 2 An electrical fault monitoring device 10, an electrical system, and a wind turbine generator set provided in an embodiment of the present disclosure are introduced.

[0033] like Figure 1As shown, an embodiment of one aspect of the present disclosure provides an electrical fault monitoring device 10 for monitoring faults in an electrical system, wherein the electrical system includes a component to be monitored 20. The electrical fault monitoring device 10 includes an electrical sensor 11, a fault diagnosis component 12, and a signal output component (not shown in the figure). The electrical sensor 11 is connected to the component to be monitored 20, and the electrical sensor 11 is used to collect electrical signals from the component to be monitored 20; the fault diagnosis component 12 is connected to the electrical sensor 11, and the fault diagnosis component 12 is used to perform fault diagnosis on the component to be monitored 20 based on the collected electrical signals; the signal output component is connected to the fault diagnosis component 12, and the signal output component is used to output a fault signal.

[0034] According to the electrical fault monitoring device 10 of the embodiment of the present disclosure, based on the use of digital analysis of electrical signals to replace fault monitoring electrical hardware, by configuring a component specifically for performing fault diagnosis, independent fault diagnosis is achieved based on the electrical signals collected by the electrical sensor 11. This can separate fault diagnosis from fault protection, share the computing load of the main controller 30 of the electrical system, release CPU usage, and improve the control efficiency of the entire machine. At the same time, the use of signal output components to output fault signals representing the diagnosis results can ensure that the main controller 30 is aware of the fault diagnosis results in a timely manner, ensuring the reliable operation of the electrical system. In addition, the present disclosure integrates electrical signal acquisition, fault analysis, and fault signal output into one, which can improve the overall structural reliability and facilitate the installation of the device. As an example, the monitored component 20 in the electrical system is, for example, but not limited to, the yaw motor in the yaw system of a wind turbine generator set. In this case, the main controller 30 is the main control PLC (Programmable Logic Controller) of the wind turbine generator set.

[0035] Specifically, the fault diagnosis element 12 includes a signal acquisition and analysis chip, which is used to implement functions such as acquisition, conversion, calculation or judgment of electrical signals.

[0036] In terms of the number of electrical sensors 11 and fault diagnosis elements 12, optionally, the number of monitored elements 20 is at least one, and each monitored element 20 is connected to at least one electrical sensor 11, so that independent electrical signal monitoring can be achieved for each monitored element 20; accordingly, the number of fault diagnosis elements 12 is equal to the number of monitored elements 20 and is set in one-to-one correspondence. Each fault diagnosis element 12 is connected to the electrical sensor 11 connected to the corresponding monitored element 20, which can cover the operation protection monitoring of all monitored elements 20, and perform targeted fault diagnosis on each monitored element 20 based on the electrical signal of each monitored element 20, thereby ensuring the accurate positioning of fault monitoring. There is no need to check each monitored element 20 one by one when a fault is diagnosed, thereby improving the monitoring efficiency.

[0037] In terms of monitoring content, the electrical sensor 11 optionally includes at least one of the following: a current sensor (e.g., a Hall current sensor, a current transformer) and a temperature sensor. By configuring at least one of the current sensor and the temperature sensor, at least the current signal and / or the temperature signal can be collected to monitor different types of faults, providing more comprehensive fault monitoring coverage.

[0038] As an example, the monitored component 20 includes an AC motor. Accordingly, the electrical sensor 11 includes three current sensors, each connected to the motor's three-phase power lines to detect the motor's three-phase current. By configuring the AC motor with three current sensors and collecting current signals from each current path, the real-time current of the AC motor can be quickly and accurately measured, enabling comprehensive monitoring of the motor's operating status and providing reliable data support for fault monitoring.

[0039] Regarding combining different types of electrical sensors 11 to achieve monitoring of different types of faults, as an example, the current signal detected by the current sensor can be combined to monitor overload faults and phase failure faults, overcurrent protection of the electrical circuit can also be achieved, and overheating faults can be monitored in combination with the temperature signal detected by the temperature sensor.

[0040] Specifically, an overload fault refers to a situation where the motor is subjected to a current exceeding its rated load during operation, causing the motor to overheat, be damaged, or stop working. When using electrical hardware to monitor overload faults, a thermal relay is usually used. The protection principle of the thermal relay is that the bimetallic strip inside it deforms after being heated, pulling the signal circuit spring, causing the normally closed contacts to be pulled open, and then transmitting the fault signal to the main controller 30. The main controller 30 issues a shutdown command to complete the entire protection process. When using electrical signals to monitor overload faults, this can be achieved by simulating the working process of the thermal relay. First, the thermal curve of the thermal relay can be fitted in advance. The horizontal axis of the thermal curve is the current rate, that is, the ratio of the real-time current to the rated current, and the vertical axis is the action time, which indicates the time it takes for the thermal relay to deform and act at a specified current rate, thereby describing the action time of the thermal relay at different current rates. When performing fault monitoring, if the current ratio is detected to be greater than 1, an overload is considered to have occurred. The thermal curve can be queried to obtain the action time corresponding to the current ratio. At the same time, the fault diagnosis component 12 continues to monitor the current changes and sends the fault diagnosis results before the action time, so that the main controller 30 can make fault protection decisions and actions. When an overload is considered to have occurred and the current changes are monitored, a variety of monitoring logics can be used, such as, but not limited to, pre-saving the protection time corresponding to different current ratios (the protection time is less than the action time of the corresponding current ratio). If a certain current ratio continuously reaches its protection time, the main controller 30 is notified. For example, the accumulated heat is calculated based on the detected current to simulate the process of the bimetallic strip of the thermal relay being heated to deformation. When the accumulated heat exceeds the heat threshold, a fault shutdown signal is generated and sent to prompt the main controller 30 to execute a shutdown. The cooling time required to dissipate the accumulated heat and cool down can also be further calculated, and the shutdown can be resumed after the cooling time is reached. The calculation of the cooling time here can be performed by the fault diagnosis component 12 or by the main controller 30.

[0041] A phase loss fault refers to a phase break in the motor. The monitoring method can be to collect current in real time and calculate it using the three-phase current calculation formula. If the current of one phase becomes 0 or drops too much, it is considered that a phase loss fault has occurred.

[0042] An overheating fault refers to a motor whose temperature is too high, and is a fault that needs to be addressed immediately. Taking the yaw motor of a wind turbine as an example, a PTC (Positive Temperature Coefficient) is often arranged inside the yaw motor to detect the temperature of the yaw motor and prevent insulation damage due to overheating. The PTC reflects the temperature through the resistance of the resistor. The higher the temperature, the greater the resistance, so the directly detected electrical signal is a resistance signal. The corresponding temperature sensor is specifically in the form of a resistance sensor. If the temperature rises suddenly, the resistance value will jump, thereby detecting an overheating fault. It is worth noting that in existing wind turbines, the PTCs of each yaw motor are connected in series, which makes it impossible to accurately locate the faulty motor. When a fault occurs, each motor needs to be checked one by one. The present disclosure can accurately monitor the insulation performance of each yaw motor by sampling each component 20 to be monitored (here, the PTC of the yaw motor) separately.

[0043] It should be understood that the above fault monitoring solutions are all exemplary descriptions, and those skilled in the art may adopt other reasonable solutions to implement fault monitoring in combination with electrical signals, and the present disclosure does not limit this.

[0044] Regarding the signal output element, the signal output element may optionally include at least one of a hardware device (e.g., a transistor, relay, etc.) and an optical element (e.g., a photocoupler). The hardware device directly drives the output fault signal using an IO driver, thereby providing a high output current and voltage capability. The optical element uses an optocoupler to isolate the input and output terminals, thereby preventing direct transmission of electrical signals and achieving electrical isolation. This effectively prevents the input signal from affecting the output device while also reducing noise interference. When using an optical element, the level is specifically changed (e.g., from a high level to a low level, or from a low level to a high level). The fault signal fed back is a DI signal (Digital Input Signal, which can be a logic high or logic low level and is used to represent different states or information). As an example, when monitoring multiple different types of faults simultaneously, different fault signals can be configured for different types of faults to facilitate differentiation. For example, a photocoupler can be configured for each fault, thereby outputting different optocoupler level signals as fault signals. Since optocoupler level signals are often represented by YO, different types of fault signals can be represented as Y1, Y2, Y3, etc.

[0045] As an example, Figure 2 As shown, the electrical fault monitoring device 10 according to the embodiment of the present disclosure may also reserve a signal input element, which is also connected to the fault diagnosis element 12 , so as to facilitate future expansion of the functions of the electrical fault monitoring device 10 .

[0046] In addition to the above structures, the electrical fault monitoring device 10 according to the embodiment of the present disclosure may further include other structures, which will be introduced below.

[0047] Optionally, the electrical fault monitoring device 10 according to an embodiment of the present disclosure further includes a communication interface for communication with the main controller 30 of the electrical system. The signal output element is used to output a fault signal indicating whether a fault has occurred. Its information output capacity is limited and there is a risk of malfunction. By further configuring the communication interface, redundant information transmission can be achieved, allowing the electrical fault monitoring device 10 to transmit more information to the main controller 30 of the electrical system. This not only meets more functional requirements, but also provides data reference when the signal output element malfunctions, correcting fault protection actions, thereby reducing unnecessary shutdown protection caused by malfunction of the signal output element. As an example, the communication interface includes an RS485 interface and / or a CAN interface. As an example, the electrical sensor 11 can collect a large number of electrical signals from the monitored element 20. The communication interface can transmit the specified electrical signals to the main controller 30 according to the instructions of the main controller 30, so that the main controller 30 can have a more comprehensive understanding of the operating status of the monitored element 20, providing more data reference for the main controller 30's control decision-making and subsequent fault analysis. Accordingly, if one or some electrical signals are not needed in fault diagnosis but can be used in other scenarios such as control decision-making and fault analysis, corresponding electrical sensors 11, such as voltage sensors, can also be configured, and this disclosure does not impose any restrictions on this.

[0048] Optionally, the electrical fault monitoring device 10 further includes: a processing element 13, connected to the signal output element and the communication interface, the processing element 13 being configured to determine a fault protection strategy based on the fault signal output by the signal output element, and to send the fault protection strategy to the main controller 30 via the communication interface. By configuring the processing element 13 specifically for determining the fault protection strategy and directly providing execution to the main controller 30, the fault protection function can also be integrated into the electrical fault monitoring device 10, thereby further sharing the computing load of the main controller 30 and further improving the overall control efficiency. It should be understood that when the electrical fault monitoring device 10 is not provided with the processing element 13, the main controller 30 determines the fault protection strategy; when the electrical fault monitoring device 10 is provided with the processing element 13, the processing element 13 determines the fault protection strategy and sends it to the main controller 30.

[0049] Optionally, the electrical fault monitoring device 10 according to an embodiment of the present disclosure further includes an integrated circuit board, on which the electrical sensor 11, the fault diagnostic component 12, and the communication interface are located. By placing these components on the integrated circuit board, the main structure of the electrical fault monitoring device 10 according to an embodiment of the present disclosure can be integrated into a single circuit board. This design achieves a high degree of integration, helps save installation space, simplifies the installation process, and reduces costs.

[0050] Optionally, the electrical fault monitoring device 10 according to an embodiment of the present disclosure further includes a housing, the interior of which defines a housing cavity, in which the integrated circuit board is located. The housing protects the main structure, which is based on the integrated circuit board, reducing the risk of damage and helping to extend the product's service life. By way of example, the housing is made of plastic, but other materials are also acceptable and are not limiting in this disclosure.

[0051] Figure 2 FIG. 1 is a topological diagram illustrating an electrical fault monitoring device 10 according to a specific embodiment of the present disclosure.

[0052] In this specific embodiment, Figure 2 Only the electrical sensor 11, fault diagnosis element 12, and signal output element configured for one component to be monitored 20 are shown, and the signal input element and communication interface connected to the fault diagnosis element 12 are also shown. The component to be monitored 20 is specifically an AC motor; the electrical sensor 11 specifically includes three Hall current sensors for collecting the three-phase current of the AC motor and corresponding signal conditioning elements ( Figure 2 The electrical sensor 11 also includes a signal conditioning element (for collecting and processing the resistance value of the PTC arranged inside the AC motor) for collecting and processing the resistance value of the PTC arranged inside the AC motor. Figure 2In the signal conditioning 4), PTC in and PTC out represent the two ends of the PTC respectively, which are used to connect the corresponding signal conditioning elements. In addition, the electrical sensor 11 also includes an analog-to-digital acquisition element to realize the conversion of analog signals into digital signals for use by the fault diagnosis element 12. The fault diagnosis element 12 specifically adopts an MCU (Microcontroller Unit), which can diagnose three types of faults: overload fault, phase failure fault, and overheating fault. The signal output element is represented by Dout, where 3CH represents the fault signal of the three types of faults, and the fault signal can be output in the form of IO drive or optocoupler isolation. The reserved signal input element corresponds to the signal output element, and the signal can be input in the form of optocoupler isolation to reduce interference. The communication interface specifically adopts an RS485 interface and is equipped with a corresponding RS484 driver chip. In addition, the electrical fault monitoring device 10 of this specific embodiment is also connected to a working power supply to provide the relevant devices with the power required for operation.

[0053] Another embodiment of the present disclosure provides an electrical system, which includes: a component to be monitored 20; and the electrical fault monitoring device 10 as described above, and thus has all the beneficial technical effects of the electrical fault monitoring device 10, which will not be repeated here.

[0054] Optionally, the monitored element 20 includes a motor to enable monitoring of operational faults of various motors. As an example, from the perspective of usage, the motors serving as the monitored element 20 may include drive motors and control motors. Drive motors include, for example, household appliance motors (e.g., washing machine motors, fan motors) and generators in wind turbines, while control motors include, for example, pitch motors and elevation motors in wind turbines. It should be understood that, as previously described, the electrical fault monitoring device 10, in addition to monitoring operational faults of motors, can also provide overcurrent protection for electrical circuits. Therefore, the monitored element 20 may also include any electrical circuit requiring overcurrent protection.

[0055] Optionally, the electrical system includes a yaw system of a wind turbine generator set; the component to be monitored 20 includes a yaw motor, so as to specifically implement monitoring of operational faults of the yaw motor.

[0056] As an example, when the wind turbine generator set performs a yaw action, the electrical fault monitoring device 10 monitors the operating current, load status (i.e., current magnification), temperature and other electrical signals of each yaw motor in real time, and performs calculations and processing within a specified period (e.g., the action time determined by the thermal curve) to determine the working status of the yaw motor, while saving the electrical signals of the most recent period for future use. If the fault diagnosis component 12 determines that the yaw motor is in an abnormal operating condition, the fault signal is sent to the processing component 13. The processing component 13 performs further analysis and determines to adopt a shutdown fault protection strategy, and sends the strategy to the main controller 30 of the yaw system. The main controller 30 outputs a shutdown signal and directly controls the contactor in the circuit to execute the fault condition logic. The main controller 30 can also request detailed data from the communication interface of the electrical fault monitoring device 10 to obtain the electrical signals collected in real time in the most recent period and the fault information obtained by the fault diagnosis component 12 analysis and processing in order to perform data analysis. The specific analysis method is an existing technology in this field and is not the main content of this disclosure, so it will not be described here.

[0057] Another general aspect of the present disclosure provides a wind turbine generator set, which includes: the electrical fault monitoring device as described above; or the electrical system as described above, thereby having all the beneficial technical effects of the electrical fault monitoring device or the electrical system, which will not be repeated here.

[0058] The present disclosure proposes an electrical fault monitoring device 10, an electrical system, and a wind turbine generator set. Based on the use of digital analysis of electrical signals to replace fault monitoring electrical hardware, the device integrates functions such as signal acquisition, fault analysis, and fault signal output, thereby sharing some of the acquisition and control tasks and computing power of the main controller 30, effectively reducing the CPU usage of the main controller 30. At the same time, the integrated structure saves both installation space and cost; the integrated design of the unit's yaw loop monitoring and protection functions enables precise monitoring and positioning; and comprehensive monitoring coverage. Furthermore, the redundant design of the dual-transmission signal can meet more functional requirements and reduce unnecessary shutdown protection caused by malfunctions.

[0059] The specific implementation methods of the present disclosure have been described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments may be modified and varied without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents. These modifications and variations should also be within the scope of protection of the claims of the present disclosure.

Claims

1. An electrical fault monitoring device (10), characterized in that: Used for monitoring faults in an electrical system, the electrical system comprising a component to be monitored (20), the electrical fault monitoring device (10) comprising: An electrical sensor (11) connected to the component to be monitored (20), the electrical sensor (11) being used to collect electrical signals of the component to be monitored (20); A fault diagnosis element (12) connected to the electrical sensor (11), the fault diagnosis element (12) being used to perform fault diagnosis on the monitored element (20) according to the collected electrical signal; A signal output element is connected to the fault diagnosis element (12), and the signal output element is used to output a fault signal.

2. The electrical fault monitoring device (10) according to claim 1, characterized in that: The number of the element (20) to be monitored is at least one, and each element (20) to be monitored is connected to at least one electrical sensor (11); The number of the fault diagnosis elements (12) and the elements to be monitored (20) is equal and they are arranged in one-to-one correspondence, and each of the fault diagnosis elements (12) is connected to the electrical sensor (11) connected to the corresponding element to be monitored (20).

3. The electrical fault monitoring device (10) according to claim 1, characterized in that: The electrical sensor (11) comprises at least one of the following: a current sensor and a temperature sensor.

4. The electrical fault monitoring device (10) according to claim 1, characterized in that: The signal output element includes at least one of the following: a hardware device, an optical element.

5. The electrical fault monitoring device (10) according to claim 1, characterized in that: The electrical fault monitoring device (10) further comprises: A communication interface is communicatively connected to a main controller (30) of the electrical system.

6. The electrical fault monitoring device (10) according to claim 5, characterized in that: The electrical fault monitoring device (10) further comprises: A processing element (13) is connected to the signal output element and the communication interface, and the processing element (13) is used to determine a fault protection strategy according to the fault signal output by the signal output element, and send the fault protection strategy to the main controller (30) via the communication interface.

7. The electrical fault monitoring device (10) according to claim 1, characterized in that: The electrical fault monitoring device (10) further comprises: An integrated circuit board, wherein the electrical sensor (11), the fault diagnosis element (12) and the signal output element are arranged on the integrated circuit board.

8. An electrical system, characterized in that: The electrical system comprises: The component to be monitored; and An electrical fault monitoring device (10) as claimed in any one of claims 1 to 7.

9. The electrical system according to claim 8, characterized in that The component to be monitored includes a motor.

10. The electrical system according to claim 9, characterized in that The electrical system includes a yaw system of the wind turbine generator set; The component to be monitored includes a yaw motor.

11. A wind turbine generator set, characterized in that: The wind turbine generator set comprises: An electrical fault monitoring device (10) as claimed in any one of claims 1 to 7; or An electrical system as claimed in any one of claims 8 to 10.

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