On-load tap changer comprehensive defect real-model intelligent simulation device and on-load tap changer comprehensive defect real-model intelligent simulation method

Abstract

The invention discloses a real-type intelligent simulation device and method for comprehensive defects of an on-load tap changer. The simulation device comprises an on-load tap changer body module, a defect model module, an online monitoring module and a background analysis module. The on-load tap changer body module is used for realizing fault simulation; the defect simulation module is used for simulating various typical faults of the on-load tap changer; the online monitoring module is used for monitoring the state of the voltage regulating switch in real time to obtain a monitoring state quantity; and the background analysis module is used for comprehensively analyzing the operation state of the on-load tap-changer according to the monitored state quantity in combination with the load switching test waveform, and improving the state diagnosis level of the on-load tap-changer.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of electric power equipment, and in particular to a device and method for simulating comprehensive defects of an on-load voltage regulating switch. Background Art

[0002] With the continuous growth of power demand, in order to ensure the stability of system voltage, the AVC system needs to frequently adjust the transformer on-load tap changer (OLTC), which significantly increases the average daily operation times of OLTC. The stable operation of OLTC plays a vital role in the power grid. As the only high-speed switching component in the operation of the transformer, OLTC has a high operating risk. In recent years, OLTC failures have occurred frequently, seriously threatening the safe and stable operation of transformers.

[0003] The main reasons for frequent OLTC failures are:

[0004] 1) OLTC has a complex structure, small parts, complex processing technology, and a large number of parts;

[0005] 2) High-speed switching. Hundreds of components need to work together and all switching is completed in more than 5 seconds;

[0006] 3) Complex operating conditions. The switch must withstand various complex longitudinal insulations while bearing the main insulation, that is, various voltage gradient requirements that cannot be quantified;

[0007] 4) Electric field distortion during switching. During voltage regulation, the current-carrying contacts, various arc-extinguishing contacts, vacuum tubes, and transfer switches inside the OLTC will be subjected to various voltages and currents. Summary of the invention

[0008] In view of the technical problems existing in the prior art, the present invention provides an on-load tap changer comprehensive defect true intelligent simulation device and method for comprehensively analyzing the operating status of the on-load tap changer and improving the diagnosis level of the on-load tap changer status.

[0009] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0010] An on-load voltage regulating switch comprehensive defect true type intelligent simulation device, comprising an on-load voltage regulating switch body module, a defect model module, an online monitoring module and a background analysis module;

[0011] The on-load tap-changing switch body module is used to implement fault simulation;

[0012] The defect simulation module is used to simulate various typical faults of the on-load tap-changing switch;

[0013] The online monitoring module is used to monitor the state of the voltage regulating switch in real time to obtain the monitoring state quantity;

[0014] The background analysis module is used to comprehensively analyze the operating status of the on-load tap changer based on the monitored status quantity and in combination with the load switching test waveform.

[0015] Preferably, the defect simulation module includes one or more of a transition resistance abnormal defect simulation module, a fastener loose defect simulation module, a contact wear defect simulation module, a switch room oil temperature abnormal defect simulation module and a spring kinetic energy insufficient defect simulation module.

[0016] Preferably, the online monitoring module comprises:

[0017] Motor torque monitoring module, used to monitor the torque signal of the drive motor in real time;

[0018] Partial discharge monitoring module, used to identify partial discharge defects inside the on-load tap changer;

[0019] Temperature monitoring unit, used to monitor contact temperature and switch room ambient temperature;

[0020] A vibration signal acquisition unit, used to detect vibration signals during the switch switching process;

[0021] The motor voltage and current monitoring unit is used to monitor the voltage and current signals of the drive motor in real time.

[0022] Preferably, the partial discharge monitoring module includes an ultra-high frequency partial discharge monitoring module and an ultrasonic partial discharge monitoring module.

[0023] Preferably, the background analysis module includes a signal monitoring and summarizing module, an original signal feature analysis module, a tap changer action characteristic analysis module, a tap changer typical defect library and a tap changer health status assessment module.

[0024] Preferably, the typical faults include one or more of loose fasteners, worn contacts, abnormal oil temperature in the switch chamber, abnormal transition resistance, and insufficient spring kinetic energy.

[0025] The present invention also discloses a simulation method based on the above-mentioned on-load voltage regulating switch comprehensive defect true type intelligent simulation device, comprising the steps of:

[0026] S1. Adjust and configure the defects of the on-load tap changer defect simulation device and set the corresponding defects;

[0027] S2. Configure the corresponding online monitoring module access according to the needs and defect settings;

[0028] S3. According to the defect settings and online monitoring signal settings, combined with the test items, the system automatically generates a test plan;

[0029] S4. Switch the defect simulation device of the on-load tap changer to one with high voltage load and one without high voltage load; monitor the data signal of the on-load tap changer through the online monitoring module;

[0030] S5. Obtain monitoring signal results, analyze the monitoring signals, automatically identify signal characteristics under defective states, generate diagnostic suggestions, and compare them with the parameters of standard devices. The system automatically generates recommendations for the effectiveness of defect detection.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] The mechanical transmission of the present invention is performed completely in accordance with the switching action of actual operation and maintenance, and at the same time relies on external detection equipment to detect the switching process, monitors the state quantities involved in the fault point, and compares the normal state at the same time, so that the difference in state quantities under the two states can be analyzed and compared; the present invention can realize real-time monitoring of the state of the voltage regulating switch, and the monitoring quantities include monitoring of state quantities such as the on-load tap changer driving motor current, tap position, mechanism torque, vibration signal during the switching process, contact temperature, etc.; according to the online monitoring state quantity, combined with the load switching test waveform, the operating state of the on-load tap changer is comprehensively analyzed to improve the state diagnosis level of the on-load tap changer. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of an embodiment of the on-load voltage regulating switch comprehensive defect true intelligent simulation device of the present invention.

[0034] Figure 2 The present invention is a flow chart of an embodiment of the method for truly intelligently simulating comprehensive defects of an on-load voltage regulating switch. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] like Figure 1 As shown, the on-load voltage regulating switch comprehensive defect true type intelligent simulation device provided by the embodiment of the present invention includes an on-load voltage regulating switch body module, a defect model module, an online monitoring module and a background analysis module;

[0037] On-load tap-changing switch body module, used to realize fault simulation;

[0038] Defect simulation module, used to simulate various typical faults of on-load tap changers;

[0039] The online monitoring module is used to monitor the state of the voltage regulating switch in real time and obtain the monitoring state quantity;

[0040] The background analysis module is used to comprehensively analyze the operating status of the on-load tap changer based on the monitored status quantity and the load switching test waveform.

[0041] Specifically, the tested customized prototype of the on-load tap-changing switch body module is designed and manufactured according to the principle of real or proportional proportion of the on-site operation and maintenance of 220kV transformers. In conjunction with relevant test equipment and components, it can realize the defect simulation of the on-load tap-changing switch of transformers with higher voltage levels. OLTC (on-load tap-changing switch) with typical defects needs to be specially processed on the customized prototype to achieve effective comparison with related normal components, and realize the failure simulation of switching energy storage mechanism, transition resistance circuit breaker simulation, switching switch contact poor contact simulation, and selector contact poor contact simulation. Through modular design, the fast switching and flexible assembly of the defect setting of OLTC can be realized. At the same time, it matches with the relevant online monitoring interface and realizes flexible matching with the online monitoring device synchronously.

[0042] Specifically, the defect simulation module includes one or more of a transition resistance abnormal defect simulation module, a fastener loose defect simulation module, a contact wear defect simulation module, a switch room oil temperature abnormal defect simulation module, and a spring kinetic energy insufficient defect simulation module. The implementation methods of the above faults are as follows:

[0043] 1) Loose fasteners: loose contacts;

[0044] 2) Contact wear: simulate different degrees of wear by reducing the contact thickness, with the thickness reduced by 1mm, 2mm, 3mm, and 4mm;

[0045] 3) Abnormal oil temperature in the switch room: The heating temperature can be controlled through the built-in heater;

[0046] 4) Insufficient spring kinetic energy: Reduce the spring energy storage by shortening the spring length to 1cm, 2cm, 3cm, 4cm and 5cm;

[0047] 5) Spring over-energy storage: Increase the spring energy storage by lengthening the spring, increasing the length by 0.5cm or 1cm.

[0048] Specifically, the online monitoring module simultaneously obtains vibration signals, power frequency voltage and current signals, partial discharge ultrasonic signals, temperature signals, drive motor torque and current, etc., fuses and analyzes the multi-dimensional signals, and analyzes the operating status of the on-load switch. Specifically, the online monitoring module can monitor 3 vibration signals, 4 power frequency current signals, 4 power frequency voltage signals, 1 partial discharge ultrasonic signal, 1 motor drive current signal and motor torque signal, and 1 temperature signal. Specifically, the online monitoring module includes: a motor torque monitoring module for real-time monitoring of the torque signal of the drive motor; a partial discharge monitoring module for identifying partial discharge defects inside the on-load tap changer; a temperature monitoring unit for monitoring the contact temperature and the ambient temperature of the switch room; a vibration signal acquisition unit for detecting vibration signals during the switch switching process; and a motor voltage and current monitoring unit for real-time monitoring of the voltage and current signals of the drive motor. The detection of each signal is achieved through the above modules.

[0049] The online monitoring module adopts a fully sealed multi-cavity shielding design with strong electromagnetic compatibility and anti-interference ability. It can filter out a variety of interference signals to ensure the accuracy of monitoring data in a strong interference environment. It also has trend charts of various monitoring signals, real-time waveform charts, automatic alarm functions, historical record query, historical trend chart query and alarm record query and other functions.

[0050] Specifically, the background analysis module includes a signal monitoring summary module, an original signal feature analysis module, a tap changer action feature analysis module, a tap changer typical defect library, and a tap changer health status assessment module. Specifically, the background analysis module can integrate multiple monitoring data to monitor the voltage, current, vibration, partial discharge, temperature, motor torque and other data of the on-load tap changer; at the same time, it records the original waveforms of the voltage, current, vibration, partial discharge, temperature and other data to analyze the detailed features of the on-load switch action. Through the developed on-load switch defect recognition algorithm, the health status of the on-load switch can be effectively evaluated, the latent defects of the on-load switch can be discovered in time, and it can be determined whether the on-load switch has defects.

[0051] The mechanical transmission of the present invention is performed completely in accordance with the switching action of actual operation and maintenance, and at the same time relies on external detection equipment to detect the switching process, monitors the state quantities involved in the fault point, and compares the normal state at the same time, so that the difference in state quantities under the two states can be analyzed and compared; the present invention can realize real-time monitoring of the state of the voltage regulating switch, and the monitoring quantities include monitoring of state quantities such as the on-load tap changer driving motor current, tap position, mechanism torque, vibration signal during the switching process, contact temperature, etc.; according to the online monitoring state quantity, combined with the load switching test waveform, the operating state of the on-load tap changer is comprehensively analyzed to improve the state diagnosis level of the on-load tap changer.

[0052] The defects of the on-load voltage regulating switch involved in the present invention include failure of the switching energy storage mechanism, poor contact of the selection switch, poor contact of the contacts, abnormal transition resistance, loose fasteners and other faults. It can simulate the common defects of the on-load voltage regulating switch and improve the status diagnosis management level and operation reliability of the on-load voltage regulating switch of the transformer.

[0053] like Figure 2 As shown, the embodiment of the present invention further provides a simulation method based on the on-load tap-changing switch comprehensive defect true type intelligent simulation device as described above, comprising the steps of:

[0054] S1. The test personnel adjust and configure the defects of the on-load tap-changing switch defect simulation device as needed and set the corresponding defects.

[0055] S2. The test personnel configure the corresponding online monitoring device access according to the needs and defect settings. When comparative testing of other sensors is required, the sensor to be tested can be replaced. The test personnel can access new detection means, monitoring methods, detection sensors, etc., and identify the differences, advantages and disadvantages of different detection methods, sensors, etc. by comparative analysis of the characteristics of the detection signal and the standard signal.

[0056] S3. The system automatically generates a test plan based on the needs, defect settings, and online monitoring signal settings, combined with the test items. The experimenter can adjust it according to the actual situation.

[0057] S4. The experimenter switches the defect simulation device of the on-load voltage regulator switch, which can be divided into two types: with high-voltage load and without high-voltage load. Through the online monitoring device, the voltage, current, vibration, partial discharge, temperature, motor torque and other data signals of the on-load tap changer can be monitored.

[0058] S5. The analysis software obtains the monitoring signal results, analyzes the monitoring signals, and uses the built-in algorithm of the analysis system to automatically identify the signal characteristics under the defect state, generate diagnostic suggestions, and compare them with the parameters of the standard device. The system automatically generates analysis suggestions such as the effectiveness of defect detection.

[0059] S6. The test personnel determine whether retesting is necessary. If retesting is necessary, the automatic retesting program can be started. If retesting is not necessary, the test task can be ended.

[0060] The present invention builds a defect simulation test system based on a physical on-load tap changer, which is used to simulate various fault defects in the operation process of the on-load tap changer, including failure of the switching energy storage mechanism, poor contact of the selection switch, poor contact of the contacts, abnormal transition resistance, loose fasteners, etc.; at the same time, it integrates sensors and monitoring modules for online monitoring of the on-load tap changer; and can simulate various defects, including: contact wear, loose fasteners, abnormal oil temperature in the switch room, insufficient spring kinetic energy, etc.; it has a highly intelligent background control and analysis software system, which can automatically generate test plans according to the selected sensors and detection types for the test personnel to choose, and independently analyze and judge the test results.

[0061] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A true intelligent simulation device for comprehensive defects of on-load voltage regulator, characterized in that: It includes on-load tap-changing switch body module, defect model module, online monitoring module and background analysis module; The on-load tap-changing switch body module is used to implement fault simulation; The defect simulation module is used to simulate various typical faults of the on-load voltage regulator; The online monitoring module is used to monitor the state of the voltage regulating switch in real time to obtain the monitoring state quantity; The background analysis module is used to comprehensively analyze the operating status of the on-load tap changer based on the monitored status quantity and in combination with the load switching test waveform.

2. The on-load voltage regulator comprehensive defect true intelligent simulation device according to claim 1 is characterized in that: The defect simulation module includes one or more of a transition resistance abnormal defect simulation module, a fastener loose defect simulation module, a contact wear defect simulation module, a switch room oil temperature abnormal defect simulation module and a spring kinetic energy insufficient defect simulation module.

3. The on-load voltage regulator comprehensive defect true intelligent simulation device according to claim 1 is characterized in that: The online monitoring module comprises: Motor torque monitoring module, used to monitor the torque signal of the drive motor in real time; Partial discharge monitoring module, used to identify partial discharge defects inside the on-load tap changer; Temperature monitoring unit, used to monitor contact temperature and switch room ambient temperature; A vibration signal acquisition unit, used to detect vibration signals during the switch switching process; The motor voltage and current monitoring unit is used to monitor the voltage and current signals of the drive motor in real time.

4. The on-load voltage regulator comprehensive defect true intelligent simulation device according to claim 3 is characterized in that: The partial discharge monitoring module includes an ultra-high frequency partial discharge monitoring module and an ultrasonic partial discharge monitoring module.

5. The on-load voltage regulator comprehensive defect true intelligent simulation device according to any one of claims 1 to 4, characterized in that: The background analysis module includes a signal monitoring summary module, an original signal feature analysis module, a tap switch action characteristic analysis module, a tap switch typical defect library and a tap switch health status assessment module.

6. The on-load voltage regulator comprehensive defect true intelligent simulation device according to any one of claims 1 to 4, characterized in that: The typical faults include one or more of loose fasteners, worn contacts, abnormal oil temperature in the switch chamber, abnormal transition resistance, and insufficient spring kinetic energy.

7. A simulation method based on the on-load tap-changing switch comprehensive defect true intelligent simulation device according to any one of claims 1 to 6, characterized in that: Includes steps: S1. Adjust and configure the defects of the on-load tap changer defect simulation device and set the corresponding defects; S2. Configure the corresponding online monitoring module access according to the needs and defect settings; S3. According to the defect settings and online monitoring signal settings, combined with the test items, the system automatically generates a test plan; S4. Switch the defect simulation device of the on-load tap changer to one with high voltage load and one without high voltage load; monitor the data signal of the on-load tap changer through the online monitoring module; S5. Obtain monitoring signal results, analyze the monitoring signals, automatically identify signal characteristics under defective states, generate diagnostic suggestions, and compare them with the parameters of standard devices. The system automatically generates recommendations for effectiveness of defect detection.

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