CN110940914A

CN110940914A - Transformer on-load switch fault diagnosis platform based on live test

Info

Publication number: CN110940914A
Application number: CN202010001964.3A
Authority: CN
Inventors: 王淇锋; 李炀; 林长海; 杨博; 彭紫楠; 王赫男; 戎士敏; 刘保安
Original assignee: State Grid Corp of China SGCC; State Grid Hebei Electric Power Co Ltd; Shijiazhuang Power Supply Co of State Grid Hebei Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Hebei Electric Power Co Ltd; Shijiazhuang Power Supply Co of State Grid Hebei Electric Power Co Ltd
Priority date: 2020-01-02
Filing date: 2020-01-02
Publication date: 2020-03-31

Abstract

The invention discloses a transformer on-load switch fault diagnosis platform based on live test, and relates to the technical field of power detection equipment; the coil, the signal processing device, the photoelectric conversion device, the D/A conversion device and the controller are sequentially connected and in one-way communication, the controller is connected with the communication device and in two-way communication, the energy taking device is connected with the signal processing device and in one-way communication, and the energy taking device is connected with the photoelectric conversion device and in one-way communication; the device realizes effective real-time monitoring, reliable and accurate fault diagnosis and early warning through a coil, a signal processing device, a photoelectric conversion device, an energy taking device, a D/A conversion device, a controller, a communication device and the like.

Description

Transformer on-load switch fault diagnosis platform based on live test

Technical Field

The invention relates to the technical field of power detection equipment, in particular to a transformer on-load switch fault diagnosis platform based on live test.

Background

The transformer is used as a main device in a transformer substation and plays an important role in a power grid, and the on-load tap changing transformer plays an important role in connecting the power grid, adjusting active and reactive power flow and stabilizing load center voltage in a power system and is increasingly widely applied to the power grid. The on-load tap-changer is the only movable part in the on-load tap-changer and is also one of the key parts. The manufacturing quality and the operation and maintenance technical level of the on-load tap-changer are directly related to the safe operation of the on-load tap-changer.

In the actual operation process, the on-load tap-changer has more faults and the fault reason is complex. The three-phase switching is not in phase, the switching time is too slow or too fast, and the reasons of sliding gear and mechanical clamping are common. As the only movable part in the on-load tap changer operating under high voltage and high current, the operating state of the diverter switch directly reflects the operating state of the on-load tap changer. When contact resistance of a contact is increased, in the process of switch replacement, switching current is several times to tens of times of normal working current, and local overheating and local discharge caused by uneven distribution of an electric field near a tap contact can be caused.

The current on-load switch power failure routine test has the following problems:

1. the transformer equipment is numerous, and the loaded switch has prominent fault.

At present, a company has more than 200 transformer substations, and more than 400 transformer substations are used as main equipment in the transformer substations, so that the guarantee of safe and stable operation of the transformer is the most important of daily maintenance test work. And 80% of transformer faults are on-load tap-changer faults. The on-site test has high safety risk, high labor intensity, disordered on-site wiring, difficult data analysis, large consumption of manpower and material resources, and can not find mechanical faults and electrical faults of the on-load tap-changer in time, thereby being difficult to meet the requirement of fine maintenance.

2. The on-load switch test needs to be wired at each side of the main transformer, so that the safety risk is high, and the labor intensity is high

The on-site on-load switch test needs two personnel to operate the instrument, 1 person acts on the on-load switch, and at least two workers climb the main transformer, wire connection is carried out on each side of the main transformer, and multiple times of wire connection by going up and down of the sleeve is needed, so that the safety risk is high, the labor intensity is high, the on-site wiring is disordered, and a large amount of manpower and material resources are required.

3. The on-load switch has many fault types, and the fault cannot be found in time after a small fault occurs.

The on-load switch has two main manufacturers, more than ten types of models, internal faults are divided into mechanical faults and electrical faults, the internal structure is complex, and the slight loosening of screws can be developed into large-scale accidents, but the traditional on-load switch maintenance only depends on two modes of daily power failure test (the period is 6 years) and action frequency hoisting inspection (once hoisting inspection every 5000 times), small-scale fault defects cannot be found in time, and the defects can only be found in the period or after the main transformer fault tripping occurs.

4. The power failure test voltage of the load switch is low, and the test data is difficult to process and analyze.

The on-load switch test is divided into a hanging inspection test and a daily routine test, which are carried out in a power failure mode, the test method is divided into an alternating current method and a direct current method, which cannot reach the actual operating voltage, the input current is only 1A, and the operating condition under the actual voltage and current cannot be simulated. The power failure test result of the on-load switch is test data plus test waveform situation, the test data can be compared by manual parameters, the test waveform can only depend on the experience of workers, and the test data is difficult to analyze.

Based on the characteristics of frequent action and high failure rate of the on-load tap-changer, the state monitoring technology is researched, latent defects are timely and effectively found, rationalization and scientization of equipment maintenance are realized, and the method has important significance for guaranteeing safe, stable and reliable operation of a power system.

At present, physical quantities of the on-load tap-changer used at home and abroad in the running state comprise mechanical vibration generated by switching action, rotation angular velocity of a driving motor, current of the driving motor, load torque of an electric mechanism, voltage waveform between a switch body and a switching contact and the like. Common monitoring methods are: vibration event monitoring, contact temperature monitoring, mechanical characteristic monitoring, and comprehensive variable monitoring. The current monitoring technology can not effectively monitor the current of the on-load tap-changer in the dynamic process in real time and carry out reliable and accurate fault diagnosis and early warning.

Problems with the prior art and considerations:

the technical problem of effective real-time monitoring, reliable and accurate fault diagnosis and early warning is solved.

Disclosure of Invention

The invention aims to solve the technical problem of providing a transformer on-load switch fault diagnosis platform based on live test, which realizes effective real-time monitoring, reliable and accurate fault diagnosis and early warning through a coil, a signal processing device, a photoelectric conversion device, an energy taking device, a D/A conversion device, a controller, a communication device and the like.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a transformer on-load switch fault diagnosis platform based on electrified test, includes coil, signal processing device, photoelectric conversion device, energy taking device, D/A conversion device, controller and communication device, coil, signal processing device, photoelectric conversion device, D/A conversion device and controller connect gradually and unidirectional communication, the controller is connected and bidirectional communication with communication device, energy taking device is connected and unidirectional communication with signal processing device, energy taking device is connected and unidirectional communication with photoelectric conversion device.

The further technical scheme is as follows: the system further comprises a server which is connected with the communication device through the Internet and is in two-way communication.

The further technical scheme is as follows: the terminal is connected with the communication device through the Internet and is in two-way communication with the server through the Internet.

The further technical scheme is as follows: the coil is a spiral coil.

The further technical scheme is as follows: the controller is a single chip microcomputer.

The further technical scheme is as follows: the communication device is a wireless communication device.

The further technical scheme is as follows: the wireless communication device is a 4G wireless communication device.

The further technical scheme is as follows: the wireless communication device is a 5G wireless communication device.

The further technical scheme is as follows: the terminal is a smart phone.

The further technical scheme is as follows: the terminal is a tablet computer.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:

the transformer on-load switch fault diagnosis platform based on the live test comprises a coil, a signal processing device, a photoelectric conversion device, an energy taking device, a D/A conversion device, a controller and a communication device, wherein the coil, the signal processing device, the photoelectric conversion device, the D/A conversion device and the controller are sequentially connected and in one-way communication, the controller is connected with the communication device and in two-way communication, the energy taking device is connected with the signal processing device and in one-way communication, and the energy taking device is connected with the photoelectric conversion device and in one-way communication. The device realizes effective real-time monitoring, reliable and accurate fault diagnosis and early warning through a coil, a signal processing device, a photoelectric conversion device, an energy taking device, a D/A conversion device, a controller, a communication device and the like.

See detailed description of the preferred embodiments.

Drawings

FIG. 1 is a schematic block diagram of embodiment 1 of the present invention;

FIG. 2 is a schematic block diagram of embodiment 2 of the present invention;

FIG. 3 is a schematic block diagram of embodiment 3 of the present invention;

fig. 4 is a screen shot of embodiment 1 of the present invention in use.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

Example 1:

as shown in FIG. 1, the invention discloses a transformer on-load switch fault diagnosis platform based on live test, which comprises a spiral coil, a signal processing device, a photoelectric conversion device, an energy taking device, a D/A conversion device, a controller, a wireless communication device, a server and a terminal, the spiral coil, the signal processing device, the photoelectric conversion device, the D/A conversion device and the controller are connected in sequence and are in one-way communication, the controller is connected with the wireless communication device and is in two-way communication, the energy-taking device is connected with the signal processing device and is in one-way communication, the energy-taking device is connected with the photoelectric conversion device and is in one-way communication, the server is connected with the wireless communication device through the internet and is in two-way communication, the terminal is connected with the wireless communication device through the internet and is in two-way communication, and the terminal is connected with the server through the internet and is in two-way communication.

The wireless communication device is a 5G wireless communication device.

The terminal is a mobile terminal which is a smart phone.

The system comprises a signal processing device, a photoelectric conversion device, a controller, a database software, a SQL Server2000, a spiral coil, an energy taking device, a signal processing device, an IN2000-S high-precision current sensor, a Tp-Link TR-932D industrial hundred-million multi-mode optical interface converter, a single chip microcomputer, a high-performance A9 ARM processor, an industrial Server, a 5G communication system between the controller and the Server, an SQL Server2000, a spiral coil sleeved on a cable, and an energy taking device for taking energy from a power supply of a load switch control box.

Example 2:

embodiment 2 is different from embodiment 1 in that the terminal is a tablet computer.

As shown in FIG. 2, the invention discloses a transformer on-load switch fault diagnosis platform based on live test, which comprises a spiral coil, a signal processing device, a photoelectric conversion device, an energy taking device, a D/A conversion device, a controller, a wireless communication device, a server and a terminal, the spiral coil, the signal processing device, the photoelectric conversion device, the D/A conversion device and the controller are connected in sequence and are in one-way communication, the controller is connected with the wireless communication device and is in two-way communication, the energy-taking device is connected with the signal processing device and is in one-way communication, the energy-taking device is connected with the photoelectric conversion device and is in one-way communication, the server is connected with the wireless communication device through the internet and is in two-way communication, the terminal is connected with the wireless communication device through the internet and is in two-way communication, and the terminal is connected with the server through the internet and is in two-way communication.

The wireless communication device is a 5G wireless communication device.

The terminal is a mobile terminal which is a tablet computer.

Example 3:

embodiment 3 is different from embodiment 1 in that the terminal is a desktop computer.

As shown in FIG. 3, the invention discloses a transformer on-load switch fault diagnosis platform based on live test, which comprises a spiral coil, a signal processing device, a photoelectric conversion device, an energy taking device, a D/A conversion device, a controller, a wireless communication device, a server and a terminal, the spiral coil, the signal processing device, the photoelectric conversion device, the D/A conversion device and the controller are connected in sequence and are in one-way communication, the controller is connected with the wireless communication device and is in two-way communication, the energy-taking device is connected with the signal processing device and is in one-way communication, the energy-taking device is connected with the photoelectric conversion device and is in one-way communication, the server is connected with the wireless communication device through the internet and is in two-way communication, the terminal is connected with the wireless communication device through the internet and is in two-way communication, and the terminal is connected with the server through the internet and is in two-way communication.

The wireless communication device is a 5G wireless communication device.

The terminal is a desktop computer.

The purpose of the application is:

on the basis of summarizing a fault characteristic change rule of on-load tap-changer on-line monitoring current, an on-load tap-changer operation state database is established, reasoning is carried out according to a fuzzy theory, and fault judgment and accurate early warning of the on-load tap-changer are achieved. The running state of the on-load switch can be monitored in real time under the condition that the running of the transformer is not influenced, the fault monitoring and diagnosis level is improved, meanwhile, the power failure time and times are obviously reduced, and a large amount of investment in manpower and material resources is reduced.

In addition, based on the ubiquitous power internet of things technology, the technical scheme can monitor the current change of the on-load tap-changer in all weather through an office intranet and an APP client, provide a diagnosis result of a normal operation state or a fault state and an intelligent operation and maintenance plan suggestion, and check historical data and real-time data of the state of the main transformer on-load switch equipment at any time and any place.

The technical route is as follows:

1. the on-load tap-changer current monitoring sensor of the transformer is arranged in a laboratory, typical defects of an on-load switch are arranged, and the current waveform is switched by directly monitoring the on-load switch.

2. Summarizing a fault characteristic change rule of on-load tap-changer on-line monitoring current, establishing an on-load tap-changer operation state database, reasoning according to a fuzzy theory, realizing fault judgment and accurate early warning of the on-load tap-changer, and carrying out model verification.

3. The online diagnosis platform of the main transformer on-load switch based on the wireless communication technology is developed by using the Internet, the wireless communication, the intelligent sensing technology and a big data analysis and calculation tool.

4. And selecting a typical demonstration area, and testing the preparation and reliability of the built platform on the spot.

The technical contribution of the present application is as follows:

1. direct acquisition of tap changer dynamic current

The operating state of the diverter switch directly reflects the operating state of the on-load tap-changer. When contact resistance of a contact is increased, switching current is several times to tens of times of normal working current in the process of switch replacement, load current signal acquisition is directly carried out through the straight-through current transformer, and an integrator of a signal processing loop integrates data of the transformer to restore a primary waveform.

2. Diagnosis of mechanical properties of load switches by means of current waveforms

And carrying out signal processing on a large number of acquired current waveforms, accurately identifying transient change of switching current of the on-load tap-changer by adopting a wavelet analysis algorithm, and extracting fault characteristics. And applying a Markov chain algorithm to establish a typical fault model library. The operating state of the on-load tap changer can be accurately judged through the innovation point, and the defect type is given. The part solves the problem of data analysis pain points of overhaul and test personnel.

3. Construction of online diagnosis platform of main transformer on-load switch

As shown in fig. 4, after the platform is built, the switching times of the on-load switches of the main transformers can be checked at any time and any place through an office intranet and a handheld APP client, all parameter information of the equipment can be stored, the current change of the on-load switches can be monitored all day long, AI analysis and judgment are performed on historical waveforms and real-time data by using a big data analysis function of a central computer, and operation, maintenance and detection plan suggestions are provided. The part solves the pain point problems of high safety risk, low management efficiency, high labor intensity and the like of the on-load tap-changer of the main transformer in daily repair and test.

The technical scheme of the application adopts the following safety control measures in application:

1. the technical measures are as follows:

the current signal acquisition device is connected with the shell, and attention is paid to avoiding the secondary side of the current transformer from being open; the insulation performance between high-voltage heavy-current equipment and a monitoring loop is ensured, and the monitoring device is prevented from being burnt; since the monitoring equipment is in a complex electromagnetic environment and has a plurality of interference sources and interference paths, a proper detection frequency band and a proper digital waveform analysis method need to be selected to eliminate the influence of system harmonic waves and field interference on measurement.

2. Organizing measures:

and (4) according to organization and technical measures for ensuring safety specified by national network safety regulations.

The product does not violate the relevant national laws and regulations and has no policy risk. However, the product has unique thought and strong operability reproducibility, so that the product has the risk of being copied by related companies in the operation process, and measures such as patent application, intellectual property protection and the like should be taken in time according to various applications of the product.

The process control specifications of achievement material selection, structure size and the like are as follows:

the main controller adopts a high-performance A9 architecture ARM processor, and the operation speed and the memory are configured according to high end.

The central analysis computer adopts an industrial server; the database software is SQL Server 2000.

The main controller and the central computer adopt 5G communication, and the operation of the current communication system is not influenced.

The mobile terminal of the mobile phone provides various operation systems APP; the computer terminal operating system is windows 7.

After the application runs secretly for a period of time, the field technical personnel feed back the following beneficial effects:

1. good applicability and simple use

The technical scheme of the application is suitable for transformer substations provided with on-load tap-changer main transformers and other similar application places.

When the transformer substation main transformer on-load tap changer diagnosis platform system is used by a user, input and output operations are limited in authority, information confidentiality and reliability are guaranteed, voltage levels and equipment lists can appear on a computer screen after the transformer substation main transformer on-load tap changer diagnosis platform system is entered, meanwhile, the transformer substation on-load tap changer diagnosis platform system has a convenient query function, and input operations are reduced as much as possible. The interface of a specific main transformer device displays the position of a tap changer, a voltage value, a current waveform, oil temperature and ring temperature, provides a current on-load tap changer state diagnosis result, and has a historical data query function.

2. Good safety benefit

By applying the developed main transformer on-load switch online diagnosis platform, the running state of the on-load switch can be monitored in real time, the three-phase switching synchronism, the transition time, whether sliding gear occurs or not, switching over slow and other defects are reflected in time, the stability of voltage regulation of the transformer is ensured, and the running level of a power grid is improved; in addition, because the hoisting maintenance and repair test of the tap changer are reduced, the problem that new hidden dangers are buried when the tap changer is installed again and the equipment safety is influenced is avoided.

3. Good economic benefit

The power failure time of the transformer can be reduced, and the investment of manpower and material resources for scheduling, operation and maintenance is reduced. The repeated operation of test operators on the switch can be avoided, the test time of the project is directly reduced to zero from 60 minutes, the labor cost is saved by 1 hour, 3 people, 80 yuan/hour =240 yuan each time, the labor cost can be saved by 19.2 ten thousand yuan in one overhaul test period according to the calculation of 800 transformers in the company in the market. Increase sales electricity yield about 800 x 1 hour 3500kW 0.5 yuan/kWh =140 ten thousand yuan.

4. Good social benefit

The three-party connection of regulation, operation and maintenance and overhaul is avoided, the power failure time of transformer test work is saved, the management efficiency of the interior of an enterprise is improved, the reliable supply of social power utilization is guaranteed, and the good image of a company is established.

5. Low cost

The cost of the developed main transformer on-load switch on-line diagnosis platform is the central server with the largest proportion, and accounts for 65% of the equipment cost. Because the equipment is arranged in the transformer, the power supply of the data acquisition module can be led into a common power supply mode with the direct-current stabilized power supply from the outside.

In addition, the production of one set of the device needs 5 days, the labor cost is 150 Yuan for one day, and the labor cost is 1500 Yuan for 2 persons; the water and electricity cost for production and the tool depreciation cost are 100 yuan in total. The installation and the debugging of the equipment can be completed together according to the maintenance plan, and the power failure cost is not involved. Therefore, the total cost of producing a set of equipment is 10650 yuan.

The popularization prospect is as follows:

1. high safety and economic benefit

Safety benefits are as follows:

Economic benefits are as follows:

Social benefits are as follows:

2. Spread in provincial and company

The technical scheme creates a working mode, directly monitors the dynamic current change process of the on-load switch, and changes the power failure maintenance test into on-line state monitoring and fault diagnosis.

The device operation safety is improved, the on-load tap-changer defects are found in time through the on-line monitoring and diagnosing platform, and an alarm signal is provided; and simultaneously, the introduction of new defects in the process of maintenance test is avoided.

The working efficiency is improved, the power failure time and times of the transformer are reduced, the transformer test items can be directly reduced from three persons to 0 person, the data analysis is converted from manual work to software analysis, and the analysis result is more accurate;

the product has wide popularization prospect, solves the pain problems of high safety risk, high management efficiency and the like, has simple achievement operation, can be produced in batches, and is suitable for popularization and application in national network systems and all units with on-load tap changers in power generation, railways, steel mills and the like.

Claims

1. The utility model provides a transformer on-load switch fault diagnosis platform based on electrified test which characterized in that: the coil, the signal processing device, the photoelectric conversion device, the energy taking device, the D/A conversion device, the controller and the communication device are sequentially connected and in one-way communication, the controller is connected with the communication device and in two-way communication, the energy taking device is connected with the signal processing device and in one-way communication, and the energy taking device is connected with the photoelectric conversion device and in one-way communication.

2. The transformer on-load switch fault diagnosis platform based on live test of claim 1, characterized in that: the system further comprises a server which is connected with the communication device through the Internet and is in two-way communication.

3. The transformer on-load switch fault diagnosis platform based on live test of claim 2, characterized in that: the terminal is connected with the communication device through the Internet and is in two-way communication with the server through the Internet.

4. The transformer on-load switch fault diagnosis platform based on live test of claim 1, characterized in that: the coil is a spiral coil.

5. The transformer on-load switch fault diagnosis platform based on live test of claim 1, characterized in that: the controller is a single chip microcomputer.

6. The transformer on-load switch fault diagnosis platform based on live test of claim 1, characterized in that: the communication device is a wireless communication device.

7. The transformer on-load switch fault diagnosis platform based on live test of claim 6, characterized in that: the wireless communication device is a 4G wireless communication device.

8. The transformer on-load switch fault diagnosis platform based on live test of claim 6, characterized in that: the wireless communication device is a 5G wireless communication device.

9. The transformer on-load switch fault diagnosis platform based on live test of claim 3, characterized in that: the terminal is a smart phone.

10. The transformer on-load switch fault diagnosis platform based on live test of claim 3, characterized in that: the terminal is a tablet computer.