CN113985135A - Transformer short circuit impact on-line monitoring device and monitoring method - Google Patents
Transformer short circuit impact on-line monitoring device and monitoring method Download PDFInfo
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- CN113985135A CN113985135A CN202111279961.7A CN202111279961A CN113985135A CN 113985135 A CN113985135 A CN 113985135A CN 202111279961 A CN202111279961 A CN 202111279961A CN 113985135 A CN113985135 A CN 113985135A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The transformer short circuit impact on-line monitoring device comprises an FPGA unit and an impact processing unit connected with the FPGA unit, wherein the FPGA unit is connected with a time synchronization unit, an analog quantity acquisition unit, a switching value acquisition unit and a network message acquisition unit, and the impact processing unit is connected with a wave recording unit, an alarm unit, an impact fault processing unit, a man-machine interaction unit and a communication unit. The invention can judge whether the short-circuit current is impacted or not in real time according to the collected transformer operation data and the impact degree. And recording an impact waveform when the impact occurs, and making a suggestion whether to need maintenance according to the impact degree and the impact frequency. When the maintenance condition is met, the alarm part gives an alarm to remind operation and maintenance personnel to maintain the transformer in time.
Description
Technical Field
The invention belongs to the technical field of electronics, relates to transformer state monitoring, and particularly relates to a transformer short circuit impact online monitoring device and a monitoring method.
Background
The transformer is a key device in the power system, and the reliable operation of the device is crucial to the stable operation of the power system. In order to ensure safe and healthy operation of the transformer, preventive maintenance and overhaul of the transformer are very important.
According to the regulation of 30 th volume oil immersed transformer (reactor) maintenance strategy (hereinafter referred to as strategy) of the national grid company transformation evaluation general management regulation, when the transformer is subjected to short circuit impact for more than 6 times between 50% and 70% of allowable short circuit current, B-type or C-type maintenance needs to be carried out in due time; when the transformer is subjected to short circuit impact between 70% and 90% of allowable short circuit current, B-class or C-class maintenance needs to be carried out at proper time; when the transformer is subjected to short circuit impact with the allowable short circuit current of more than 90%, B-class or C-class maintenance needs to be immediately carried out.
At present, no equipment for monitoring the short circuit impact of the transformer exists in the market, so that the strategy is difficult to implement.
Disclosure of Invention
In order to meet the market demand, the invention discloses an online monitoring device and a monitoring method for short-circuit impact of a transformer, which can monitor the condition of short-circuit impact on the transformer in real time.
The transformer short circuit impact on-line monitoring device comprises an FPGA unit and an impact processing unit connected with the FPGA unit, wherein the FPGA unit is connected with a time synchronization unit, an analog quantity acquisition unit, a switching value acquisition unit and a network message acquisition unit, and the impact processing unit is connected with a wave recording unit, an alarm unit, an impact fault processing unit, a human-computer interaction unit and a communication unit.
Preferably, the network message acquisition unit includes an SV submodule for acquiring an analog signal and a GOOSE submodule for acquiring a switching value signal.
Preferably, the communication unit is a wireless communication component which communicates with the internet of things perception layer manager.
The invention also discloses an on-line monitoring method for the short circuit impact of the transformer, which comprises the following steps:
s1, initializing a system;
s2, processing a detection strategy;
s3, judging whether the shock-resistant structure is in a shock state, if so, entering a step S4, otherwise, entering a step S5;
s4, the system carries out peak value processing, and records peak current and time for entering an impact state until an impact state end condition is reached;
after reaching the impact state ending condition, clearing the impact mark and ending the impact treatment;
and S5, after the impact state is reached, setting an impact mark, starting wave recording, setting peak data and occurrence data, and returning to the step 2 after the impact state ending condition is reached.
Preferably, the system initialization includes: setting an impact mark as invalid, setting parameters such as maintenance strategies and the like, setting a cycle period, and setting a first gear short circuit threshold, a second gear short circuit threshold and a third gear short circuit threshold from high to low.
Preferably, the detection strategy is to make a judgment on whether maintenance is needed or not according to the third short circuit threshold and the current impact frequency, and if the maintenance condition is met, send a start alarm command to the alarm unit
By adopting the transformer short-circuit impact on-line monitoring device, whether the transformer short-circuit impact is caused or not can be judged in real time according to the collected transformer operation data, and the degree of the impact is caused. And recording an impact waveform when the impact occurs, and making a suggestion whether to need maintenance according to the impact degree and the impact frequency. When the maintenance condition is met, the alarm part gives an alarm to remind operation and maintenance personnel to maintain the transformer in time.
Drawings
Fig. 1 is a schematic diagram of an embodiment of an online monitoring device for short circuit impact of a transformer according to the present invention.
Fig. 2 is a schematic diagram of a specific working mode of the transformer short circuit impact on-line monitoring device of the invention.
FIG. 3 is a process flow diagram of one embodiment of an impact processing unit of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
One embodiment of the transformer short circuit impact on-line monitoring device is shown in fig. 1 and comprises an FPGA unit and an impact processing unit connected with the FPGA unit, wherein the FPGA unit is connected with a time synchronization unit, an analog quantity acquisition unit, a switching value acquisition unit and a network message acquisition unit, and the impact processing unit is connected with a wave recording unit, an alarm unit, an impact fault processing unit, a human-computer interaction unit and a communication unit.
Under a specific application environment, the analog quantity acquisition unit is used for acquiring analog quantity real-time data of the transformer, and acquiring 0-5A signals converted by the current transformer and 0-100V signals converted by the voltage transformer. And the acquired analog quantity signals are subjected to A/D conversion to be digital signals, and then are transmitted to the FPGA unit for processing through digital filtering.
The switching value acquisition unit is used for acquiring switching value real-time data of the transformer, and transmitting acquired switching value signals to the FPGA unit for processing after photoelectric conversion and debouncing.
The network message acquisition unit is used for acquiring SV and GOOSE messages, wherein SV is an analog quantity data message sent by the merging unit, and GOOSE is a message sent by a protection device or an intelligent terminal (data in the GOOSE message is generally on-off quantity but not limited to on-off quantity), and the packet is sent to the FPGA unit for processing.
And the time synchronization unit is used for receiving and analyzing the clock message sent by the power clock device, sending the analyzed result to the FPGA and modifying the CPU clock in real time. The time synchronization unit can receive B code, namely IRIG-B signal, and also can receive and process NTP clock signal.
And the FPGA unit marks the received analog quantity data, switching value data, SV messages and GOOSE messages and then packages the signals to the impact processing unit.
And the impact processing unit analyzes, calculates and judges the real-time running data of the transformer sent by the FPGA, and then issues information and commands to other units according to the result.
For a typical state, each cycle time is 20 milliseconds, when an impact occurs, the recording unit stores analog quantity data and switching quantity data of the first 10 cycles, namely 200 milliseconds, and the second 150 cycles, namely 3 seconds, into a waveform file according to the general format for transient data exchange of power systems (GB/T22386-.
The alarm unit is a switching value output circuit, and when the maintenance condition specified by the strategy is met, the alarm unit gives an alarm by closing a switching value node.
And the impact data processing unit is responsible for managing impact data, including the work of inserting, inquiring, deleting and the like of impact data records.
The human-computer interaction unit is used for completing the functions of parameter configuration, impact data query, impact data display and the like, and is generally a touch screen.
The communication unit comprises a wired part and a wireless part: the wire adopts a network, 61850 protocol and is communicated with the upper-level dispatching; and the wireless communication with the Internet of things perception layer manager is completed by adopting an MODBUS protocol. The processor mainly completes analysis processing such as analysis calculation, record storage and the like of the acquired data. Calculating starting criterion of the transformer impacted every other power frequency cycle (20 ms), judging whether the impact condition is met, if so, synchronously recording waves and realizing recording, storing, analyzing, processing, displaying and other functions of the recorded wave data; when the number of times of impact on the transformer reaches a set threshold value, the device informs the monitoring system to output an alarm signal, and a specific working mode is shown in fig. 2.
Table 1 shows a specific implementation structure table of the FPGA unit for the data package:
TABLE 1
| Sign (Sign) |
| Length (packet Length) |
| Timestamp (time mark) |
| SmpCnt (sampling number) |
| Aislenum (number of channels) |
| AisleDate (channel data) |
The definition of each parameter is specifically as follows:
sign: flag, 4 bytes, big-end mode, 0xa1a2a3a4
Length: packet length, 2 bytes, big end mode
Timestamp: time scale, 4 bytes second, 4 bytes microsecond, big end mode
SmpCnt: sample number, 2 bytes, big end mode
Aislenum: channel number, 2 byte, big end mode
AisleDate: channel data, 4 bytes per channel, big end mode.
The short circuit impact on-line monitoring method adopted by the short circuit impact on-line monitoring device comprises the following steps:
s1, system initialization: setting an impact threshold value, cycle period time, an air drop proportion, an impact frequency alarm value, an impact amplitude alarm value, a peak load initial value and an impact frequency initial value;
for example, the cycle period time may be set to 20 msec, and the air-drop ratio may be set to 25%. Both the peak load initial value and the impact number initial value may be set to 0.
S2, detecting transformer parameters in each cycle at regular time, wherein the transformer parameters comprise a load, 2-order harmonic current and fundamental current;
s3, judging whether the impact state is met, if so, entering a step S4, otherwise, returning to the step S2;
the impact state is as follows: the load reaches the impact threshold and is not in a transformer air-drop state;
the transformer air-drop state is as follows: the ratio of the 2-order harmonic current to the fundamental current in the transformer parameters is greater than the air-drop ratio;
s4, the system enters an impact state, wave recording is started, and peak current and time for entering the impact state are recorded; and adding 1 to the impact frequency;
comparing the current load with the peak load, if the current load is greater than the peak load, updating the peak load according to the current load value, and calculating the impact amplitude according to the peak load; if the value is less than the preset value, the updating is not carried out;
s5, when the condition of meeting the condition of quitting the impact state is detected, recording the impact ending time, and quitting the impact state; and returns to step S2;
the condition of exiting the impact state is as follows: (100- α)% of load less than impact threshold; α is a hysteresis ratio, and may be set to 2, for example.
And S6, monitoring the impact times and the impact amplitude, and alarming when the impact times are greater than the impact time alarm value or the impact amplitude is greater than the impact amplitude alarm value.
FIG. 3 is a process flow diagram of one embodiment of an impact handling unit, comprising the steps of:
s1, initializing a system;
s2, processing a detection strategy;
s3, judging whether the shock-resistant structure is in a shock state, if so, entering a step S4, otherwise, entering a step S5;
s4, the system carries out peak value processing, and records peak current and time for entering an impact state until an impact state end condition is reached;
after reaching the impact state ending condition, clearing the impact mark and ending the impact treatment;
and S5, after the impact state is reached, setting an impact mark, starting wave recording, setting peak data and occurrence data, and returning to the step 2 after the impact state ending condition is reached.
In the "initialization" step: the threshold sets three gears, the first gear allows 50% of the short circuit current, the second gear allows 70% of the short circuit current, and the third gear allows 90% of the short circuit current. And initializing and setting an impact zone bit to be invalid, setting parameters such as maintenance strategies and the like. The cycle period is one power frequency cycle (20 milliseconds).
The step of 'detection strategy processing' is to judge whether maintenance is needed or not according to the three-gear impact times and a set threshold value, and if the maintenance condition is met, a starting alarm command is sent to an alarm unit.
The judgment basis of the 'in-impact state' is as follows: any phase current on three sides of the transformer is larger than or equal to the first gear threshold value, and the air-drop mark is invalid. The proportion of the second harmonic component to the fundamental component is more than 25%, and the space-time bidding is effective, otherwise, the proportion is ineffective.
The step of 'starting wave recording' is to send a starting command to the wave recording program.
The 'setting occurrence data' is the time when the processing impact occurs and the transformer operation data when the processing impact occurs, and comprises the current, the voltage and the like of the three-phase side of the transformer.
The peak value data is the maximum value of the running data of the transformer in the impact process, and the three-phase side currents are respectively counted.
The judgment criterion of "reaching the end condition" is that all the currents on three sides of the transformer are less than 98% of the threshold value of the first gear.
The 'impact end processing' flow is that the impact grade is classified according to the peak value data of the impact, and complete impact records are recorded, including the occurrence time, the end time, the impact grade, the peak value and the like of the impact; and counting the impact times of each grade.
The transformer short circuit impact on-line monitoring device and the communication of the internet of things sensing layer can adopt a Modbus-RTU communication mode, and the table 2 is a ModBus point table diagram and comprises 1 start bit, 8 data bits and 1 stop bit. The function code is a 03H (read hold register) instruction, and the check code adopts a CRC-16 format. The CRC generator polynomial is (X16 + X15 + X2 + 1).
TABLE 2
| Register address | Name (R) | Remarks for note |
| 0x1000 | Impact | State of impact |
| 0x1001 | WarningState | Alarm state |
| 0x1002 | FirstCount | Number of first-gear impact |
| 0x1003 | SecondCount | Second gear impact frequency |
| 0x1004 | ThirdyCount | Number of third-gear impact |
The invention can judge whether the short-circuit current is impacted or not in real time according to the collected transformer operation data and the impact degree. And recording an impact waveform when the impact occurs, and making a suggestion whether to need maintenance according to the impact degree and the impact frequency. When the maintenance condition is met, the alarm part gives an alarm to remind operation and maintenance personnel to maintain the transformer in time.
The foregoing is a description of preferred embodiments of the present invention, and the preferred embodiments in the preferred embodiments may be combined and combined in any combination, if not obviously contradictory or prerequisite to a certain preferred embodiment, and the specific parameters in the examples and the embodiments are only for the purpose of clearly illustrating the inventor's invention verification process and are not intended to limit the patent protection scope of the present invention, which is defined by the claims and the equivalent structural changes made by the content of the description of the present invention are also included in the protection scope of the present invention.
Claims (6)
1. The transformer short circuit impact on-line monitoring device is characterized by comprising an FPGA unit and an impact processing unit connected with the FPGA unit, wherein the FPGA unit is connected with a time synchronization unit, an analog quantity acquisition unit, a switching value acquisition unit and a network message acquisition unit, and the impact processing unit is connected with a wave recording unit, an alarm unit, an impact fault processing unit, a human-computer interaction unit and a communication unit.
2. The transformer short-circuit impact on-line monitoring device as claimed in claim 1, wherein the network message collection unit comprises an SV submodule for collecting analog signals and a GOOSE submodule for collecting switching signals.
3. The transformer short-circuit impact on-line monitoring device as claimed in claim 1, wherein the communication unit is a wireless communication component communicating with a sensing layer manager of the internet of things.
4. The transformer short circuit impact on-line monitoring method is characterized by comprising the following steps:
s1, initializing a system;
s2, processing a detection strategy;
s3, judging whether the shock-resistant structure is in a shock state, if so, entering a step S4, otherwise, entering a step S5;
s4, the system carries out peak value processing, and records peak current and time for entering an impact state until an impact state end condition is reached;
after reaching the impact state ending condition, clearing the impact mark and ending the impact treatment;
and S5, after the impact state is reached, setting an impact mark, starting wave recording, setting peak data and occurrence data, and returning to the step 2 after the impact state ending condition is reached.
5. The transformer short-circuit impact on-line monitoring method according to claim 4, wherein the system initialization comprises: setting an impact mark as invalid, setting parameters such as maintenance strategies and the like, setting a cycle period, and setting a first gear short circuit threshold, a second gear short circuit threshold and a third gear short circuit threshold from high to low.
6. The transformer short circuit impact on-line monitoring method according to claim 4, characterized in that the detection strategy is processed to make a judgment whether maintenance is needed or not according to a third short circuit threshold and a current impact frequency, and if a maintenance condition is reached, a start alarm command is sent to an alarm unit.
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Cited By (2)
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| CN116522739A (en) * | 2023-06-29 | 2023-08-01 | 南昌科晨电力试验研究有限公司 | Transformer short-circuit impact control method and system based on data analysis |
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