CN112816917B - Transformer impact monitoring device - Google Patents
Transformer impact monitoring device Download PDFInfo
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- CN112816917B CN112816917B CN202110409271.2A CN202110409271A CN112816917B CN 112816917 B CN112816917 B CN 112816917B CN 202110409271 A CN202110409271 A CN 202110409271A CN 112816917 B CN112816917 B CN 112816917B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
Abstract
The invention discloses a transformer impact monitoring device, relates to the field of transformer monitoring, and solves the problem that the prior art can not accurately monitor transformer impact and record impact data, and the transformer impact monitoring device comprises: the signal conversion module is used for acquiring an analog signal output by the transformer PT/CT and converting the analog signal into a low-voltage analog signal in an isolated manner; the switch-in module is used for acquiring a switching value signal of a breaker in the transformer and performing optical coupling isolation and level conversion; the output module is used for providing an output of the four-way relay empty node alarm signal; the acquisition module is used for carrying out high-speed synchronous sampling on the low-voltage analog signal and the switching value signal, stamping a time stamp accurate to microsecond on sampling data and outputting the sampling data in a network giant frame form; the management module is used for judging the transformer impact event according to the collected data and managing impact data according to a judgment result; the signal conversion module, the input module and the output module are connected with the acquisition module, and the acquisition module is connected with the management module.
Description
Technical Field
The invention relates to the technical field of transformer monitoring, in particular to a transformer impact monitoring device.
Background
With the continuous progress of science and technology, the dependence of modern production and life on electric power is increasingly tight while electric power brings huge power and benefits to the development of human society and economy. This can cause catastrophic consequences in the event of a power system failure, particularly a large area power outage. Therefore, since the advent of power systems, how to ensure safe and stable operation of the power systems has become a constant subject of research of power workers.
The power transformer is one of the most central and widely applied junction devices for energy transmission and conversion in the power grid, the performance of the power transformer is closely related to the safety and reliability of the power system, and the reliable operation of the devices is crucial to the stable operation of the power system. Along with the continuous increase of the capacity of a power grid, a transformer can often cause a winding to deform under the action of huge impact force formed by multiple times of near-zone short-circuit current for a long time, and because the winding deformation has an accumulative effect, the transformer can still run for a period of time after suffering from impact, the mechanical dynamic stability of the winding can be seriously damaged when the deformation is accumulated to a certain degree, meanwhile, the insulation strength of the transformer can be reduced due to the deformation of the winding, and finally, the transformer is damaged, so that a lot of accident potential hazards are brought to the stable running of a power system. In recent years, statistical analysis shows that short-circuit impact is one of the main causes of transformer winding deformation and transformer burning loss.
In the prior art, no monitoring equipment specially aiming at transformer impact exists, the monitoring of the transformer impact mainly depends on a fault recording monitoring device and a relay protection device for auxiliary monitoring, and the occurrence of the transformer impact is estimated by taking a fault report, fault data and a recording starting signal or a relay protection action event and an alarm condition as references.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a transformer impact monitoring device to solve the problems that the prior art cannot accurately identify a transformer impact event and cannot accurately record transformer impact data.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a transformer surge monitoring apparatus, the apparatus comprising: the system comprises a signal conversion module, an input module, an output module, an acquisition module and a management module; the signal conversion module, the input module and the output module are all connected with the acquisition module, and the acquisition module is connected with the management module;
the signal conversion module is used for acquiring an analog signal output by PT/CT in the transformer, converting the analog signal into a low-voltage analog signal through voltage transformer/current transformer isolation, and sending the low-voltage analog signal to the acquisition module;
the switching module is used for acquiring a switching value signal of a circuit breaker in a transformer, performing optical coupling isolation and level conversion on the switching value signal and then transmitting the switching value signal to the acquisition module;
the open-out module is used for providing external output of the four-way relay empty node alarm signal;
the acquisition module is used for carrying out high-speed synchronous sampling on the low-voltage analog signal and the switching value signal, stamping a time stamp accurate to microsecond on the sampled data, and transmitting the acquired data in a network giant frame form to the management module;
the management module is used for judging the transformer impact event according to the acquired data, analyzing, counting and storing the impact data according to the judgment result, and feeding back a diagnosis and maintenance alarm signal to the acquisition module.
Preferably, the acquisition module and the management module are interconnected through a gigabit network by a CPCI connector, and data is transmitted through a backboard.
Preferably, the acquisition module comprises an AD conversion unit, an optical coupling isolation unit, a driving isolation unit and an acquisition unit, and the AD conversion unit, the optical coupling isolation unit and the driving isolation unit are all connected with the acquisition unit;
the AD conversion unit is used for converting the low-voltage analog signal into digital quantity data for the acquisition unit to read;
the optical coupling isolation unit is used for carrying out optical coupling isolation on the received switching value signal, converting the 24V switching value signal into a 3.3V or 5V level signal and sending the level signal to the acquisition unit;
the drive isolation unit is used for providing 4 paths of optical coupling isolation drive signals to the output module;
the acquisition unit is used for sampling digital quantity data output by the AD conversion unit and level signals output by the optical coupling isolation unit, stamping a time stamp accurate to microsecond on the sampled data, outputting the acquired data in a network giant frame form, receiving an alarm signal transmitted by the management module and sending the alarm signal to the drive isolation unit.
Preferably, the acquisition module further comprises a level conversion unit, a first program storage unit, a first network interface unit and a first serial interface unit, which are connected with the acquisition unit;
the level conversion unit is used for receiving RS485 differential level time tick signals sent by a time service system, converting the RS485 differential level time tick signals into TTL level time tick signals and sending the TTL level time tick signals to the acquisition unit, and the acquisition unit is also used for carrying out time tick according to the TTL level time tick signals;
the first program storage unit is used for providing a program storage medium for the acquisition module so as to read and operate a program after the acquisition module is powered on and reset;
the first network interface unit is used for coding and parallel-serial conversion of the acquired data output by the acquisition unit, and outputting the acquired data in a serial digital signal form to the management module;
the first serial interface unit is used for converting TTL level time tick signals output by the acquisition unit into RS232 level signals so as to provide pulse time tick signals to the management module, receiving alarm signals sent by the management module, converting the RS232 level signals into TTL levels, and feeding the TTL levels back to the acquisition unit.
Preferably, the management module includes a second network interface unit, a second serial interface unit, a CPU unit and a third network interface unit, and the second network interface unit, the second serial interface unit and the third network interface unit are all connected to the CPU unit;
the second network interface unit is used for decoding and performing serial-parallel conversion on the acquired data output by the first network interface unit, and transmitting the acquired data in a digital signal form to the CPU unit;
the second serial interface unit is used for converting the pulse time tick signal output by the first serial interface unit from RS232 level to TTL level and transmitting the TTL level to the CPU unit, and is used for receiving the alarm signal of the CPU unit, converting the TTL level of the alarm signal to RS232 level and transmitting the RS232 level to the first serial interface unit;
the CPU unit is used for judging transformer impact events according to the acquired data sent by the second network interface unit, obtaining a judgment result, analyzing, counting and storing impact data according to the judgment result, and feeding back diagnosis and maintenance alarm signals to the second serial interface unit and the third network interface unit;
the third network interface unit is used for transmitting the impact data and the alarm signal output by the CPU unit in a networking mode or transmitting the impact data and the alarm signal to a background monitoring system in an external communication mode, and the third network interface unit supports an IEC61850 protocol.
Preferably, the management module further includes a memory unit, a second program storage unit and a data storage unit connected to the CPU unit;
the memory unit is used for temporarily storing the operation data in the CPU unit and the data exchanged with the external memory and caching the collected data of the CPU unit for judging the impact time;
the second program storage unit is used for storing data of an operating system and an application program in the CPU unit;
the data storage unit is used for storing the acquired data, the impact data and the alarm information of the transformer.
Preferably, the CPU unit may implement the following method:
carrying out impact judgment on the acquired data to obtain an impact judgment result;
when the impact judgment result is that the transformer is impacted, counting the impact times;
and when the impact times reach a preset impact time threshold value, carrying out early warning prompt.
Preferably, the device further comprises a power module;
the power supply module is used for 12V direct current power supply of each module in the device.
Preferably, the device further comprises a wireless transmission module connected with the management module, and the wireless transmission module is connected with a CPU unit in the management module through a third serial interface unit;
the third serial interface unit is used for converting TTL level signals sent by the CPU unit into RS232 level signals and transmitting the RS232 level signals to the wireless transmission module;
the wireless transmission module is used for converting the analysis result and the alarm signal output by the management module into wireless signals and sending the wireless signals to the background monitoring system.
Preferably, the device further comprises a human-computer interaction module connected with the management module, and the human-computer interaction module is connected with a CPU (central processing unit) in the management module through a human-computer interface unit;
the man-machine interface unit is used for providing an I/O digital interface and a liquid crystal display interface for the man-machine interaction module;
the human-computer interaction module is used for connecting human-computer interaction equipment to complete human-computer information interaction, configuration of parameters required by the management module for judging the impact event and display of impact data waveforms and statistical analysis results.
The beneficial effects of the invention are concentrated and expressed as follows:
1. the transformer impact monitoring device provided by the invention realizes online monitoring of transformer impact on the basis of transformer monitoring technology and diagnosis and analysis research, and records the process and the overall appearance of transformer impact events at a high speed, accurately and without leakage in a global impact range; the analysis and the statistics of the transformer impact data and the storage and the display of the transformer impact data are completed; the problem that the prior art cannot accurately and exhaustively record transformer impact events in a global impact range, cannot carry out intelligent diagnosis and maintenance of the transformer, and can only provide reference for transformer impact monitoring by using a fault recording monitoring device or a relay protection device is solved; the invention provides powerful analysis tools and technical support for relay protection personnel and operation and maintenance personnel, and has important significance for ensuring the reliable operation of the power grid, reducing the waste of manpower, material resources, financial resources and time, improving the economic benefit of enterprises and ensuring the reliable operation of the power grid.
2. According to the transformer impact monitoring device, the acquisition module and the management module are interconnected through a gigabit network by a CPCI connector, and data are transmitted through interconnection of the backboard; not only saves external network cables, reduces the error rate of data transmission, improves the anti-interference capability of the device, but also ensures that the data is stable and reliable, and meets the requirements of large capacity and high bandwidth of the device.
3. According to the transformer impact monitoring device, the acquisition module is provided with the acquisition unit, the management module is provided with the CPU unit, time synchronization, data acquisition, storage and time stamping processing are carried out in the acquisition module, data storage, judgment, statistical analysis and result display are carried out in the management module, intelligent diagnosis and maintenance of the transformer are carried out by combining a big data analysis technology and a boundary algorithm, all modules work independently and supplement each other, and the transformer impact monitoring device is easy to develop, use, find problems and overhaul rapidly.
Drawings
Fig. 1 is a schematic functional block diagram of a transformer impact monitoring apparatus according to a first embodiment of the present invention.
Fig. 2 is a detailed functional block diagram of fig. 1.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The transformer impact monitoring method aims at the prior art, the transformer impact monitoring in the prior art mainly depends on a fault recording monitoring device and a relay protection device for auxiliary monitoring, and the transformer impact occurrence estimation is carried out by taking a fault report, fault data, a recording starting signal or a relay protection action event and an alarm condition as references.
If the transformer impact event is monitored by providing reference through the fault recording monitoring device or the relay protection device, the fault recording monitoring device or the relay protection device is compared with the transformer impact monitoring device, the respective mathematical model, the starting algorithm, the starting condition, the function and the purpose are different, and the following problems are easy to exist when the transformer impact event is monitored by the fault recording monitoring device or the relay protection device: the fault recording monitoring device cannot accurately identify the transformer impact event, and the record and statistics of the transformer impact event can be omitted; the fault recording monitoring device cannot record the process and the overall appearance of the transformer impact in the full threshold range; the intelligent diagnosis and maintenance early warning of the transformer can not be completed by recording various parameters of the transformer before and after the impact occurs and in the whole process. Therefore, it is not suitable to rely on fault recording monitoring devices or relay protection devices to monitor transformer surge events.
The invention provides a transformer impact monitoring device aiming at the problems, and the specific idea is as follows:
the device comprises a signal conversion module, an input module, an output module, an acquisition module and a management module; the signal conversion module, the input module and the output module are all connected with the acquisition module, and the acquisition module is connected with the management module; the signal conversion module is used for acquiring an analog signal output by PT/CT in the transformer, converting the analog signal into a low-voltage analog signal through voltage transformer/current transformer isolation, and sending the low-voltage analog signal to the acquisition module; the switching module is used for acquiring a switching value signal of a circuit breaker in a transformer, performing optical coupling isolation and level conversion on the switching value signal and then transmitting the switching value signal to the acquisition module; the open-out module is used for providing external output of the four-way relay empty node alarm signal; the acquisition module is used for carrying out high-speed synchronous sampling on the low-voltage analog signal and the switching value signal, stamping a time stamp accurate to microsecond on the sampled data, and transmitting the acquired data in a network giant frame form to the management module; the management module is used for judging the transformer impact event according to the acquired data, analyzing, counting and storing the impact data according to the judgment result, and feeding back a diagnosis and maintenance alarm signal to the acquisition module.
By the technical scheme, on the basis of transformer monitoring technology and diagnosis analysis research, transformer impact on-line monitoring is realized, and the process and the overall appearance of transformer impact events are recorded within a global impact range at high speed, accurately and without leakage; the analysis and the statistics of the transformer impact data and the storage and the display of the transformer impact data are completed; the problem that the prior art cannot accurately and exhaustively record transformer impact events in a global impact range, cannot carry out intelligent diagnosis and maintenance of the transformer, and can only provide reference for transformer impact monitoring by using a fault recording monitoring device or a relay protection device is solved; the invention provides powerful analysis tools and technical support for relay protection personnel and operation and maintenance personnel, and has important significance for ensuring the reliable operation of the power grid, reducing the waste of manpower, material resources, financial resources and time, improving the economic benefit of enterprises and ensuring the reliable operation of the power grid.
Example 1
Referring to fig. 1 to 2, the present embodiment provides a transformer surge monitoring apparatus, which may be applied to monitor a single transformer or multiple transformers, and the apparatus may include:
the system comprises a signal conversion module, an input module, an output module, an acquisition module, a management module, a wireless transmission module, a human-computer interface module and a power supply module; the signal conversion module, the opening module and the opening module are all connected with the acquisition module, the wireless transmission module and the human-computer interface module are connected with the management module, and the acquisition module is connected with the management module.
Specifically, the signal conversion module is used for acquiring an analog signal output by a PT/CT in the transformer, converting the analog signal into a low-voltage analog signal through a voltage transformer/current transformer in an isolated manner, and sending the low-voltage analog signal to the acquisition module;
in a specific embodiment, the signal conversion module performs isolation conversion on analog signals output by 32 voltage transformers (PT)/Current Transformers (CT), and uniformly converts the analog signals into low-voltage analog signals of ± 5V (Vp-p) and outputs the low-voltage analog signals to the acquisition module.
The switching module is used for acquiring a switching value signal of a circuit breaker in a transformer, performing optical coupling isolation and level conversion on the switching value signal and then transmitting the switching value signal to the acquisition module;
in a specific embodiment, the open-in module converts 32 direct-current 220V switching value signals into 24V level digital value signals after optical coupling isolation conversion, and outputs the digital value signals to the acquisition module.
The open module is used for providing external output of the four-way relay empty node alarm signal.
In a specific embodiment, the output module provides external output of alarm signals including shock starting, maintenance alarm, power failure alarm, device abnormality and the like.
The acquisition module is used for carrying out high-speed synchronous sampling on the low-voltage analog signal and the switching value signal, stamping a time stamp accurate to microsecond on the sampled data, and transmitting the acquired data in a network giant frame form to the management module.
In a specific embodiment, the acquisition unit adopts an FPGA chip, specifically a Cyclone IV EP4CE40F23I8L chip, has the advantages of low cost, high performance and low power consumption, and is suitable for high-speed data communication and application occasions with high real-time requirements.
The management module is used for judging the transformer impact event according to the acquired data, analyzing, counting and storing the impact data according to the judgment result, and feeding back a diagnosis and maintenance alarm signal to the acquisition module.
The wireless transmission module is used for converting the analysis result and the alarm signal output by the management module into wireless signals and sending the wireless signals to the background monitoring system;
specifically, data such as the number of transformer impact step threshold values sent by the management module, the current impact state, the impact ending state, the overhaul warning signal, the effective values of the high-voltage side impact current A, B, C phases, the effective values of the middle-voltage side impact current A, B, C phases, the impact occurrence time (the values of year, month, day, hour, minute, second and millisecond), the impact current percentage (impact current/rated current 100%) and the like are converted into wireless signals to be sent to the background monitoring system;
in a specific implementation mode, the wireless transmission module adopts an embedded ZigBee wireless transmission module, is an embedded wireless communication module which accords with the IEEE802.15.4 standard, is internally provided with a ZigBee protocol stack and a communication API, has industrial-grade firm and durable quality, and has the advanced characteristics of low power consumption, flexible networking, convenience in use and the like. The embedded ZigBee wireless transmission module is designed to work in a 2.4GHz frequency band, adopts a DSSS spread spectrum modulation mode, and has good stability and anti-interference performance.
The human-computer interaction module is used for connecting human-computer interaction equipment to complete human-computer information interaction, configuration of parameters required by the management module for judging the impact event and display of impact data waveforms and statistical analysis results; specifically, the human-computer interaction device comprises a key, a mouse, an indicator light and a liquid crystal display.
The power supply module is used for supplying 12V direct current for each module in the device;
in a specific embodiment, the power module can be powered by a single power module, and can also be powered by a dual power module hot standby. In this embodiment, the power module adopts the switching power module, supports the alternating current-direct current power supply, and the concrete parameter is: AC/DC: 85-265V, output voltage: 12V/6A, output power: 72W.
Specifically, the acquisition module and the management module realize gigabit network interconnection through a CPCI connector, and data are transmitted through backboard interconnection; the collection module with the management module all includes the PCB board and sets up the electronic components on the PCB board, just collection module with all be provided with the CPCI connector on the PCB board of management module, collection module with the management module passes through the CPCI connector and connects on the same backplate that the physics supported, and wherein, the public head of CPCI connector sets up on collection module and management module's PCB board, and the female head of CPCI connector sets up on the backplate. In the embodiment, the acquisition module and the management module are interconnected through the CPCI connector and the back plate, so that external network cables are saved, the data transmission error rate is reduced, the anti-interference capability of the device is improved, the stability and reliability of data are ensured, and the requirements of the device on large capacity and high bandwidth are met.
In one embodiment, the acquisition module comprises:
the system comprises an AD conversion unit, an optical coupling isolation unit, a driving isolation unit, a collection unit, a level conversion unit, a first program storage unit, a first network interface unit and a first serial interface unit;
the AD conversion unit, the optical coupling isolation unit, the driving isolation unit, the level conversion unit, the first program storage unit, the first network interface unit and the first serial interface unit are all connected with the acquisition unit;
the AD conversion unit is used for converting the low-voltage analog signal into digital quantity data for the acquisition unit to read;
the optical coupling isolation unit is used for carrying out optical coupling isolation on the received switching value signal, converting the 24V switching value signal into a 5V level signal and sending the level signal to the acquisition unit;
the drive isolation unit is used for providing 4 paths of optical coupling isolation drive signals to the output module;
the acquisition unit is used for sampling digital quantity data output by the AD conversion unit and level signals output by the optical coupling isolation unit, stamping a timestamp accurate to microsecond on the sampled data, outputting the acquired data in a network giant frame form, receiving an alarm signal transmitted by the management module and transmitting the alarm signal to the drive isolation unit;
the level conversion unit is used for receiving an RS485 differential level (IRIG-B code) timing signal sent by the time service system, converting the RS485 differential level (IRIG-B code) timing signal into a TTL level timing signal and sending the TTL level timing signal to the acquisition unit;
in a specific embodiment, the acquisition unit is further configured to time the time according to the TTL level time tick; receiving IRIG-B code time tick signals sent by the level conversion unit, providing accurate time tick for an acquisition module where the IRIG-B code time tick signals are located, converting adult, month, day, hour, minute, second and second pulse time tick signals and sending the converted signals to the first serial interface unit;
the first program storage unit is used for providing a program storage medium for the acquisition module, so that the acquisition module reads and runs programs after power-on reset, and the device cannot run due to program loss after power failure is prevented;
the first network interface unit is used for coding and parallel-serial conversion of the acquired data output by the acquisition unit, and outputting the acquired data in a serial digital signal form to the management module; specifically, the first network interface unit adopts a gigabit network PHY chip, and codes, performs digital-to-analog conversion and parallel-serial conversion on the digital signals output by the acquisition unit, and transmits the digital signals to the management module after being isolated by a network transformer;
the first serial interface unit is used for converting TTL level time tick signals output by the acquisition unit into RS232 level signals so as to provide year, month, day, time, minute, second and PPS second pulse time tick signals to the management module, so that the management module can accurately time, and is used for receiving alarm signals sent by the management module, converting the alarm signals from RS232 level into TTL level and feeding back the TTL level to the acquisition unit.
In another embodiment, the management module includes a second network interface unit, a second serial interface unit, a CPU unit, a third network interface unit, a memory unit, a second program storage unit, and a data storage unit,
the second network interface unit, the second serial interface unit, the third network interface unit, the memory unit, the second program storage unit and the data storage unit are all connected with the CPU unit;
the second network interface unit is used for decoding and performing serial-parallel conversion on the acquired data output by the first network interface unit, and transmitting the acquired data in a digital signal form to the CPU unit;
in a specific embodiment, the second network interface unit adopts a PHY chip, and is connected to the first network interface unit in the acquisition module through a gigabit network interface, specifically, a 10G high-speed connector interconnection technology is adopted, and pluggable and interconnected modules can be realized through a backplane, so that on-site maintenance and module replacement are facilitated, and maintenance efficiency is improved;
the second serial interface unit is used for converting the annual, monthly, daily, time, minute, second and PPS second pulse time setting signals output by the first serial interface unit from RS232 level to TTL level and transmitting the TTL level to the CPU unit, and is used for receiving the alarm signals of the CPU unit, converting the TTL level to RS232 level and transmitting the RS232 level to the first serial interface unit;
the CPU unit is used for judging transformer impact events according to the acquired data sent by the second network interface unit, obtaining a judgment result, analyzing, counting and storing impact data according to the judgment result, and feeding back diagnosis and maintenance alarm signals to the second serial interface unit and the third network interface unit;
in a specific embodiment, the CPU unit adopts a COM-E module, specifically adopts a Type10COM-E module to match with a self-development carrier plate, and has a specific size of 84mm × 55mm, a compact structure, a small volume, a light weight, and an easy development and use, thereby reducing development cost. The CPU processor in the COM-E module specifically adopts an INTEL Celeron CPU N2807, and the specific parameters are as follows: 2 × 1.56G, L2 Cache 1MB, power consumption 4.5W TDP;
the third network interface unit is used for transmitting the impact data and the alarm signal output by the CPU unit in a networking mode or transmitting the impact data and the alarm signal to a background monitoring system in an external communication mode, and supports an IEC61850 protocol;
in a specific embodiment, the third network interface unit adopts a media access control (MAC + PHY) chip of a gigabit network, has 1-4 100/1000Mb/s self-adaptive network interfaces, and specifically transmits information such as a transformer constant value list, a transformer impact event list, a transformer impact data file, an impact alarm, an overhaul alarm, device abnormality and the like to a background monitoring system or a power dispatching system through a 100/1000M network port;
the memory unit is used for temporarily storing the operation data in the CPU unit and the data exchanged with the external memory and caching the collected data of the CPU unit for judging the impact time, and the memory unit specifically adopts DDR3L 1333M/TS with the capacity of 8 GB;
the second program storage unit is used for storing data of an operating system and an application program in the CPU unit;
in a specific embodiment, the second program storage unit is connected to 1 mini-SATA (m-SATA) electronic disk by using a SATA bus, has a capacity of 32GB, and is configured to store an operating system and an application program, and specifically uses a 32GB ms start SSD electronic disk;
the data storage unit is used for storing acquired data, impact data and alarm information of the transformer, and specifically adopts a 256GB mSTAT SSD electronic disk;
in a specific embodiment, the data storage unit is connected to 1 mini-SATA (m-SATA) electronic disk by using a SATA bus, and has a capacity of 256GB, and is configured to store transformer sampling data, impact data, and alarm information.
Specifically, the management module further comprises a third serial interface unit, and the wireless transmission module is connected with the CPU unit in the management module through the third serial interface unit;
and the third serial interface unit is used for converting impact data and alarm information sent by the CPU unit from TTL level signals into RS232 level signals and transmitting the RS232 level signals to the wireless transmission module.
And the wireless transmission module is connected with the CPU unit of the management module through a third serial interface unit. And the wireless transmission module transmits the impact data, the impact times, the current impact state and/or early warning prompt information, the impact ending state, an overhaul warning signal, the effective values of A, B, C phases of high-voltage, medium-voltage and low-voltage side impact currents of the transformer, the impact occurrence time (the values of year, month, day, hour, minute, second and millisecond), and the percentage of the impact current (the impact current/rated current multiplied by 100%) to a background monitoring system in a wireless mode. As an acquisition terminal of a ubiquitous power Internet of things sensing layer, the ubiquitous power Internet of things sensing terminal is the first innovative application of the ubiquitous Internet of things technology to a transformer impact on-line monitoring device. The network transmission and the wireless transmission are used together, so that the device has wider application range.
Specifically, the management module further comprises a human-computer interface unit, and the human-computer interaction module is connected with a CPU (central processing unit) in the management module through the human-computer interface unit;
the man-machine interface unit is used for providing an I/O digital interface and a liquid crystal display interface for the man-machine interaction module, and is convenient for man-machine information interaction and waveform data display.
Specifically, the CPU unit may implement the following method:
step 1: carrying out impact judgment on the acquired data to obtain an impact judgment result;
step 2: when the impact judgment result is that the transformer is impacted, counting the impact times;
and step 3: and when the impact times reach a preset impact time threshold value, carrying out early warning prompt and outputting warning information.
In a specific embodiment, the step 1 may include:
step 1.1: judging whether the acquired current information meets a preset starting condition or not and whether the transformer is airdropped or not;
in a specific embodiment, the step of determining whether the transformer meets a preset starting condition specifically includes:
step A1.1.1: judging whether the current effective value of any one phase of all phases of the high-voltage side, all phases of the medium-voltage side and all phases of the low-voltage side of the transformer reaches a preset current threshold value and/or not, and/or judging whether the current effective value of any one phase of all phases of the high-voltage side, all phases of the medium-voltage side and all phases
Judging whether the mutation magnitude of any phase of all phases of the high-voltage side, all phases of the medium-voltage side and all phases of the low-voltage side of the transformer reaches a mutation constant value and/or
Judging whether the effective value of the differential current of any one of the three phases of the transformer A, B, C reaches the constant value of the differential current;
step A1.1.2: if the current effective value of any one of all phases of a high-voltage side, all phases of a medium-voltage side and all phases of a low-voltage side of the transformer reaches a preset current threshold value, or the abrupt change value reaches an abrupt change fixed value, or the differential current effective value of any one of the A, B, C three phases reaches a differential current fixed value, judging that the transformer meets a preset starting condition;
step A1.1.3: otherwise, judging that the transformer does not meet the preset starting condition.
In a specific embodiment, the step of determining whether there is an air-drop in the transformer specifically includes:
step B1.1.1: judging whether the second harmonic current effective value of the differential current of any one of three phases of the transformer A, B, C is greater than an air-drop threshold value, wherein the air-drop threshold value is a preset ratio of rated current;
b1.1.2, if the effective value of the second harmonic current is larger than an air-drop threshold value, judging that the transformer has air-drop;
and B1.1.3, if the second harmonic current effective value is less than or equal to the air drop threshold value, determining that the transformer has no air drop. )
Whether the transformer has air drop or not is accurately judged and distinguished, and a theoretical basis is provided for accurately judging the impact event of the transformer.
Step 1.2: if the transformer meets the preset starting condition and no air drop exists, judging that the transformer is impacted;
the transformer impact starting method is creatively provided, and a theoretical basis is provided for recording the impact state of the transformer.
Step 1.3: and if the transformer does not meet the preset starting condition or the air drop exists, judging that the transformer is not impacted.
In a specific embodiment, the impact is ended when the effective values of the currents of all phases of the high voltage side, the medium voltage side and the low voltage side of the transformer are smaller than the preset proportion of the preset current threshold value.
In this embodiment, when the effective current values of all phases of the high voltage side, the medium voltage side and the low voltage side of the transformer are all smaller than 97% of the preset current threshold value, the impact is ended.
In a specific embodiment, the step 2 may include:
step 2.1: when the transformer is impacted, further judging the impact grade of the current according to the current information, wherein the impact grade comprises a first grade, a second grade and a third grade which are gradually increased, and the lowest value of the first grade is the preset current threshold value;
in this embodiment, according to the regulations in the regulations of the regulations (trial implementation) of power transformation management of the national grid company, when the transformer is impacted by 50-70% of rated value for 6 times, the class B or class C overhaul needs to be carried out in due time; when the transformer is impacted by 70-90% of rated value for 1 time, B-class or C-class maintenance needs to be carried out timely; class B or class C service is immediately deployed when the transformer is subjected to an impact 1 of more than 90% of the rated value. The first level of this embodiment is 50-70% (excluding 70%) of the current rating of the transformer, the second level is 70-90% (excluding 90%) of the current rating of the transformer, and the third level is 90% or more of the current rating of the transformer. To increase field flexibility, the threshold ranges for each of the impact classes may be adjusted to suit the application.
In this embodiment, the preset current threshold is the lowest value of the first level, i.e. 50% of the rated current value of the transformer.
The step threshold theory of the setting current in three grades is creatively provided for the first time, the threshold ranges of the first grade, the second grade and the third grade are step thresholds, reference threshold values are provided for recording transformer impact events, and theoretical bases are provided for accurately and uninterruptedly recording the transformer impact events in the universe impact range.
Step 2.2: and carrying out corresponding impact frequency statistics according to the impact grade of the current.
In one embodiment, after determining the impact level of the present current, the method further comprises:
and storing and displaying the impact data of the transformer, wherein the impact data comprises impact occurrence time, impact ending time, an impact occurrence state, real-time waveforms of voltage, current and switching value of the transformer before the impact occurs, real-time waveforms of the voltage, current and switching value of the transformer when the impact occurs, and real-time waveforms of the voltage, current and switching value of the transformer after the impact occurs.
In this embodiment, the impact data may include the impact occurrence time; end time of impact; before and after the impact occurs and in the whole process, the real-time waveforms of the voltage, the current and the switching value of a single transformer are obtained; before and after the impact occurs and in the whole process, the real-time waveforms of the voltage, the current and the switching value of all transformers of the device are accessed.
In another embodiment, after determining the impact level of the present current, the method further includes:
and according to the impact grade of the current, carrying out statistics on the corresponding impact duration, effective voltage value and peak value, effective current value and peak value, switching value displacement times and displacement time.
In this embodiment, the on-site analysis and the automatic statistics are performed, and specifically, the statistics may include the statistics of the number of impacts of each level; counting the impact time length of each grade; before and after the impact occurs and in the whole process, the voltage and current effective value, the peak value, the switching value deflection times and the deflection time of a single transformer are counted; before and after the impact occurs and in the whole process, statistics of voltage and current effective values, peak values, switching value displacement times and displacement time of all transformers of the device are accessed.
In a specific embodiment, the step 3 may include:
step 3.1: judging whether the impact times reach a preset time threshold value corresponding to the impact grade, wherein the preset impact time threshold value comprises a first time, a second time and a third time which are gradually reduced;
in this embodiment, the preset time threshold corresponding to the first gear is 7 times, the preset time threshold corresponding to the second gear is 5 times, and the preset time threshold corresponding to the third gear is 3 times. In order to increase the field flexibility, the preset time threshold value corresponding to the impact grade can be adjusted according to the actual situation.
The frequency parameter of the impact current step threshold is set in a grading mode, a 3-grade setting current step threshold frequency theory is creatively provided, and setting is carried out according to the inverse function relation of current and impact frequency, so that a basis is provided for overhauling of the transformer.
Step 3.2: and when the impact frequency reaches a preset frequency threshold value corresponding to the impact grade, carrying out early warning prompt.
In this embodiment, after the conditions of the three-gear stepped-threshold impact level of the transformer and the corresponding stepped-threshold impact frequency set by the user are met, a maintenance alarm is prompted.
The CPU unit is combined with a big data analysis technology and a boundary algorithm, so that the analysis of the comprehensive state of the transformer is realized, the early warning and accurate fault study and judgment are actively predicted, the running state of the transformer is accurately mastered, the potential fault of the transformer is timely and effectively found, the occurrence probability of the power accident and the transformer fault is effectively reduced, a scientific inspection and maintenance plan is made, the intelligent operation and maintenance are realized, and the safety and reliability of the running of a power system are improved.
The transformer impact monitoring device provided by the embodiment realizes online monitoring of transformer impact on the basis of transformer monitoring technology and diagnosis and analysis research, and records the process and the overall appearance of transformer impact events in a global impact range at a high speed, accurately and without leakage; the analysis and the statistics of the transformer impact data and the storage and the display of the transformer impact data are completed; the problem that the prior art cannot accurately and exhaustively record transformer impact events in a global impact range, cannot carry out intelligent diagnosis and maintenance of the transformer, and can only provide reference for transformer impact monitoring by using a fault recording monitoring device or a relay protection device is solved; the invention provides powerful analysis tools and technical support for relay protection personnel and operation and maintenance personnel, and has important significance for ensuring the reliable operation of the power grid, reducing the waste of manpower, material resources, financial resources and time, improving the economic benefit of enterprises and ensuring the reliable operation of the power grid; the intelligent diagnosis and maintenance of the transformer are carried out by combining a big data analysis technology and a boundary algorithm, and the modules work independently and supplement each other, so that the intelligent diagnosis and maintenance of the transformer are easy to develop and use, find problems and quickly maintain.
The invention solves the dilemma that the transformer impact event can not be identified, recorded and counted because a relay protection device or a fault recording monitoring device provides reference for the transformer impact event; the impact events of the air-drop transformer and the transformer can be accurately identified, and the process and the overall appearance of the impact events of the transformer can be accurately recorded in a global range at a high speed without omission; the working state of the transformer can be known timely and accurately, the data of the transformer subjected to impact can be recorded in real time, the times of different step threshold values of the transformer subjected to impact, the intensity of the voltage and the current of the impact, the total time of the impact and the like can be counted, and the on-line monitoring and early warning of the impact condition of the transformer can be realized; the intelligent diagnosis and maintenance of the transformer are completed, after the condition of any impact frequency in three levels of transformer impact step threshold and transformer impact step threshold frequency set by a user is met, a red indicator light is used for prompting and sending maintenance alarm, the large data analysis technology and the boundary algorithm are combined, the overvoltage data and short circuit impact data of the transformer are deeply mined, the maintenance alarm event is carried out, the equipment maintenance intelligent diagnosis is carried out by combining the equipment commissioning age, the maintenance record and the transformer operating environment condition, the scientific inspection and maintenance plan is formulated, and the intelligent operation and maintenance are realized.
The device is used as an acquisition terminal of a ubiquitous power internet of things sensing layer, and can comprehensively sense real-time data and running states of impact of the transformer; on the basis of a big data analysis technology and a boundary algorithm, intelligent diagnosis of equipment maintenance is developed, a scientific inspection and maintenance plan is made, and intelligent operation and maintenance are realized; a new operation and inspection mode with inspection resource sharing, inspection process integration and inspection strategy optimization is created; the method lays a foundation for the construction of ubiquitous power Internet of things, the operation of a power grid is safer, the management is more lean, the investment is more accurate, and the service is better.
It should be noted that, for simplicity of description, the foregoing embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and elements referred to are not necessarily required in this application.
Claims (9)
1. A transformer surge monitoring apparatus, the apparatus comprising: the system comprises a signal conversion module, an input module, an output module, an acquisition module and a management module; the signal conversion module, the input module and the output module are all connected with the acquisition module, and the acquisition module is connected with the management module;
the signal conversion module is used for acquiring an analog signal output by PT/CT in the transformer, converting the analog signal into a low-voltage analog signal through voltage transformer/current transformer isolation, and sending the low-voltage analog signal to the acquisition module;
the switching module is used for acquiring a switching value signal of a circuit breaker in a transformer, performing optical coupling isolation and level conversion on the switching value signal and then transmitting the switching value signal to the acquisition module;
the open-out module is used for providing external output of the four-way relay empty node alarm signal;
the acquisition module is used for carrying out high-speed synchronous sampling on the low-voltage analog signal and the switching value signal, stamping a time stamp accurate to microsecond on the sampled data, and transmitting the acquired data in a network giant frame form to the management module;
the management module is used for judging the transformer impact event according to the acquired data, analyzing, counting and storing the impact data according to the judgment result, and feeding back a diagnosis and maintenance alarm signal to the acquisition module; the acquisition module comprises an acquisition unit, a level conversion unit, a first program storage unit, a first network interface unit and a first serial interface unit, wherein the level conversion unit, the first program storage unit, the first network interface unit and the first serial interface unit are connected with the acquisition unit;
the level conversion unit is used for receiving RS485 differential level time tick signals sent by a time service system, converting the RS485 differential level time tick signals into TTL level time tick signals and sending the TTL level time tick signals to the acquisition unit, and the acquisition unit is also used for carrying out time tick according to the TTL level time tick signals;
the first program storage unit is used for providing a program storage medium for the acquisition module so as to read and operate a program after the acquisition module is powered on and reset;
the first network interface unit is used for coding and parallel-serial conversion of the acquired data output by the acquisition unit, and outputting the acquired data in a serial digital signal form to the management module;
the first serial interface unit is used for converting TTL level time tick signals output by the acquisition unit into RS232 level signals so as to provide pulse time tick signals to the management module, receiving alarm signals sent by the management module, converting the RS232 level signals into TTL levels, and feeding the TTL levels back to the acquisition unit.
2. The transformer impact monitoring device according to claim 1, wherein the acquisition module and the management module are interconnected through a gigabit network by a CPCI connector, and data is transmitted through a backplane.
3. The transformer impact monitoring device according to claim 1, wherein the acquisition module further comprises an AD conversion unit, an optical coupling isolation unit, and a driving isolation unit, and the AD conversion unit, the optical coupling isolation unit, and the driving isolation unit are all connected with the acquisition unit;
the AD conversion unit is used for converting the low-voltage analog signal into digital quantity data for the acquisition unit to read;
the optical coupling isolation unit is used for carrying out optical coupling isolation on the received switching value signal, converting the 24V switching value signal into a 3.3V or 5V level signal and sending the level signal to the acquisition unit;
the drive isolation unit is used for providing 4 paths of optical coupling isolation drive signals to the output module;
the acquisition unit is used for sampling digital quantity data output by the AD conversion unit and level signals output by the optical coupling isolation unit, stamping a time stamp accurate to microsecond on the sampled data, outputting the acquired data in a network giant frame form, receiving an alarm signal transmitted by the management module and sending the alarm signal to the drive isolation unit.
4. The transformer impact monitoring device according to claim 3, wherein the management module comprises a second network interface unit, a second serial interface unit, a CPU unit and a third network interface unit, and the second network interface unit, the second serial interface unit and the third network interface unit are all connected with the CPU unit;
the second network interface unit is used for decoding and performing serial-parallel conversion on the acquired data output by the first network interface unit, and transmitting the acquired data in a digital signal form to the CPU unit;
the second serial interface unit is used for converting the pulse time tick signal output by the first serial interface unit from RS232 level to TTL level and transmitting the TTL level to the CPU unit, and is used for receiving the alarm signal of the CPU unit, converting the TTL level of the alarm signal to RS232 level and transmitting the RS232 level to the first serial interface unit;
the CPU unit is used for judging transformer impact events according to the acquired data sent by the second network interface unit, obtaining a judgment result, analyzing, counting and storing impact data according to the judgment result, and feeding back diagnosis and maintenance alarm signals to the second serial interface unit and the third network interface unit;
the third network interface unit is used for transmitting the impact data and the alarm signal output by the CPU unit in a networking mode or transmitting the impact data and the alarm signal to a background monitoring system in an external communication mode, and the third network interface unit supports an IEC61850 protocol.
5. The transformer impact monitoring device according to claim 4, wherein the management module further comprises a memory unit, a second program storage unit and a data storage unit connected with the CPU unit;
the memory unit is used for temporarily storing the operation data in the CPU unit and the data exchanged with the external memory and caching the collected data of the CPU unit for judging the impact time;
the second program storage unit is used for storing data of an operating system and an application program in the CPU unit;
the data storage unit is used for storing the acquired data, the impact data and the alarm information of the transformer.
6. The transformer surge monitoring device of claim 4, wherein the CPU unit is further configured to:
carrying out impact judgment on the acquired data to obtain an impact judgment result;
when the impact judgment result is that the transformer is impacted, counting the impact times;
and when the impact times reach a preset impact time threshold value, carrying out early warning prompt.
7. The transformer surge monitoring device of any one of claims 1 to 6, wherein the device further comprises a power module;
the power supply module is used for 12V direct current power supply of each module in the device.
8. The transformer impact monitoring device according to any one of claims 1 to 6, further comprising a wireless transmission module connected to the management module, wherein the wireless transmission module is connected to the CPU unit in the management module through a third serial interface unit;
the third serial interface unit is used for converting TTL level signals sent by the CPU unit into RS232 level signals and transmitting the RS232 level signals to the wireless transmission module;
the wireless transmission module is used for converting the analysis result and the alarm signal output by the management module into wireless signals and sending the wireless signals to the background monitoring system.
9. The transformer impact monitoring device according to any one of claims 1 to 6, further comprising a human-computer interaction module connected to the management module, wherein the human-computer interaction module is connected to a CPU (central processing unit) in the management module through a human-computer interface unit;
the man-machine interface unit is used for providing an I/O digital interface and a liquid crystal display interface for the man-machine interaction module;
the human-computer interaction module is used for connecting human-computer interaction equipment to complete human-computer information interaction, configuration of parameters required by the management module for judging the impact event and display of impact data waveforms and statistical analysis results.
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| CN113884950A (en) * | 2021-09-28 | 2022-01-04 | 国家电网有限公司 | Main transformer impulse current on-line monitoring appearance |
| CN113985135A (en) * | 2021-11-01 | 2022-01-28 | 成都府河电力自动化成套设备有限责任公司 | Transformer short circuit impact on-line monitoring device and monitoring method |
| CN114113862A (en) * | 2021-11-30 | 2022-03-01 | 国网四川省电力公司成都供电公司 | Transformer short circuit impact monitoring method and monitoring device |
| CN114217564A (en) * | 2022-02-23 | 2022-03-22 | 中国电子科技集团公司第二十八研究所 | Multifunctional GSM reconnaissance monitoring system |
| CN116127163B (en) * | 2023-04-14 | 2023-08-15 | 国网江西省电力有限公司电力科学研究院 | Anti-interference power transformer short circuit impact analysis system and method |
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Denomination of invention: A Transformer Impact Monitoring Device Effective date of registration: 20230818 Granted publication date: 20210713 Pledgee: Agricultural Bank of China Limited by Share Ltd. Chengdu high tech Industrial Development Zone Branch Pledgor: CHENGDU GONGBAILI AUTOMATION EQUIPMENT Co.,Ltd. Registration number: Y2023510000200 |