CN212229138U - Inside monitoring system that wets of oiled paper capacitive transformer bushing - Google Patents
Inside monitoring system that wets of oiled paper capacitive transformer bushing Download PDFInfo
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Abstract
The utility model discloses a high voltage and insulating technical field's an oiled paper condenser transformer bushing portion monitoring system that wets aims at solving the timely perception that can't realize transformer bushing trouble defect among the prior art, and can't detect out the technical problem of the inside defect that wets. The system comprises a state perception front end, a relay processing end electrically connected with the state perception front end and a client terminal in communication connection with the relay processing end; the state-aware front end: the method is used for acquiring the electric field intensity of the oiled paper capacitive transformer bushing; the relay processing terminal: the device is used for identifying the moisture degree of the oilpaper capacitive transformer bushing based on the electric field intensity and pushing the moisture degree to a client terminal.
Description
Technical Field
The utility model relates to an inside monitoring system that wets of oiled paper capacitive transformer bushing belongs to high voltage and insulating technical field.
Background
The oiled paper condenser transformer bushing has a compact and complex structure, and if the oiled paper condenser transformer bushing is improperly designed in delivery and field installation, the oiled paper condenser transformer bushing is easy to become the weakest link in transformer insulation under a long-term strong electromagnetic field and a severe atmosphere environment. According to incomplete statistics, the proportion of the transformer bushing failure is only second to that of a tap switch in the fault defects caused by the AC high-voltage transformer accessories, and reaches 35% -45%.
Common transformer bushing defects include insulation moisture, outer insulation surface fouling flashover, floating potential discharge, poor end screen grounding, insulation oil leakage and the like. The oil paper condenser type transformer bushing is easy to generate internal damp faults, and the accident case caused by the insulating damp of the oil paper condenser type transformer bushing is positioned at the front of the transformer bushing fault types. The internal fault defect of the transformer bushing has strong latency, and the transformer bushing is developed to a certain degree, so that sudden severe accidents such as combustion, explosion and the like are easily caused. Therefore, the method has very important significance for timely finding potential damp fault defects of the transformer bushing.
At present, the fault defect of the transformer bushing is mainly judged by two means: the method has the advantages that firstly, the regular maintenance is carried out, namely, the fault diagnosis is carried out by measuring the capacitance, the dielectric loss and the frequency domain dielectric spectrum of the sleeve off line, the method has large workload and complex operation, the power failure treatment is needed, and the potential fault defect can not be found in time. And secondly, on-site live detection mainly comprises two modes of ultraviolet imaging detection and infrared imaging detection, wherein the ultraviolet imaging mode mainly aims at external abnormal corona discharge of the sleeve, and the infrared imaging mode mainly aims at abnormal heating faults of the surface and the joint of the sleeve, and both the two modes can not realize timely perception of the fault defects of the transformer sleeve and can not detect internal defects such as deterioration, moisture and the like.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model aims to provide an oiled paper condenser transformer bushing portion monitoring system that wets to solve the timely perception that can't realize transformer bushing trouble defect among the prior art, and can't detect out the technical problem of inside defect that wets.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
a moist monitoring system in oiled paper capacitive transformer bushing, including state perception front end, relaying processing end in connection with electric property of state perception front end, customer's terminal in connection with relaying processing end communication;
the state-aware front end: the method is used for acquiring the electric field intensity of the oiled paper capacitive transformer bushing;
the relay processing terminal: the device is used for identifying the moisture degree of the oilpaper capacitive transformer bushing based on the electric field intensity and pushing the moisture degree to a client terminal.
Furthermore, the state perception front end is provided with three flanges which are correspondingly arranged at the flanges of the A-phase, B-phase and C-phase oil paper capacitive transformer sleeves and are used for correspondingly monitoring the power frequency electric field intensity axial component amplitudes at the flanges of the A-phase, B-phase and C-phase oil paper capacitive transformer sleeves.
Further, the relay processing end comprises a background relay electrically connected with the state sensing front end and a cloud server respectively in communication connection with the background relay and the client terminal;
the background relay: the device is used for solving the change rate of the electric field strength of the oiled paper condenser transformer bushing in the adjacent time interval and the total time interval based on the electric field strength and judging the degree of moisture of the oiled paper condenser transformer bushing based on the change rate of the electric field strength of the oiled paper condenser transformer bushing in the adjacent time interval and the total time interval;
the cloud server: and the moisture level is sent to the client terminal in response to the access request of the client terminal.
Furthermore, the state perception front end adopts a software or/and hardware mode to perform low-power-consumption operation, and comprises a miniature electric field probe, an amplification filtering module, a first controller and a first wireless communication module which are electrically connected in sequence;
the miniature electric field probe is used for converting the power frequency electric field intensity of the oiled paper capacitive transformer bushing into an electric signal;
the amplifying and filtering module is used for amplifying or/and filtering interference components of the electric signals to obtain power frequency electric field signals;
the first controller is used for carrying out software filtering on the power frequency electric field signal;
the first wireless communication module is used for transmitting the power frequency electric field signal after the software filtering to the background relay.
Further, the background relay comprises a second controller, and a second wireless communication module and a third wireless communication module which are electrically connected with the second controller respectively;
the second wireless communication module is used for receiving the power frequency electric field signal which is transmitted by the first wireless communication module and filtered by the software;
the second controller is used for analyzing the power frequency electric field signal filtered by the software and identifying the damp degree of the oiled paper capacitive transformer bushing;
the third wireless communication module is used for transmitting the moisture degree to a cloud server.
Further, the first controller or/and the second controller comprises an MCU module, the first wireless communication module or/and the second wireless communication module comprises a Lora communication module, and the third wireless communication module comprises a GPRS communication module.
Compared with the prior art, the utility model discloses the beneficial effect who reaches: the utility model discloses system non-contact real-time supervision oiled paper condenser transformer bushing flange is near power frequency electric field intensity, thereby acquire oiled paper condenser transformer bushing's electric field intensity, whether adopt to wet the inside tide of analysis and identification algorithm based on electric field intensity, in time propelling movement to client terminal with the identification result through high in the clouds server, in order to reach the purpose of in time learning transformer bushing running state, not only can compensate the not enough of current detection means, fill transformer bushing internal defect non-contact on-line monitoring technique's blank, and can and in time discover potential fault defect, further guarantee the operation of the safety and stability of super extra-high voltage transformer substation in the district.
Drawings
FIG. 1 is a schematic diagram of the operation of an embodiment of the system of the present invention;
fig. 2 is a schematic diagram of a structure of the state-sensing front end according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a low power consumption operation of the state-aware front end in an embodiment of the system of the present invention;
fig. 4 is a schematic diagram of a structure of the background relay in the embodiment of the system of the present invention;
fig. 5 is a schematic flow chart of the moisture analysis and identification algorithm according to the embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
It should be noted that, in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc. indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for convenience of description of the present invention but do not require the present invention to be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
After the oiled paper capacitive transformer bushing is degraded and damped to a certain degree, the overall dielectric property of the oiled paper capacitive transformer bushing is obviously changed, so that the spatial electric field distribution of the oiled paper capacitive transformer bushing is influenced. Based on the above principle, the utility model provides a monitoring method that wets in oiled paper capacitive transformer bushing portion, including following step:
(1) and monitoring the axial component amplitudes of the power frequency electric field intensities near the sleeve flanges of the oil paper capacitive transformers of the A phase, the B phase and the C phase in real time, namely the electric field intensities of the oil paper capacitive transformers of the A phase, the B phase and the C phase.
(2) On the basis of the electric field intensity obtained by monitoring, the damp degree of the oilpaper capacitive transformer bushing is identified by adopting a damp analysis and identification algorithm, and the method specifically comprises the following steps:
the total monitoring time duration is divided into a plurality of time periods, and the time duration of each time period is assumed to be T. Firstly, solving the change rate of the electric field intensity amplitude compared between two adjacent time periods of each oil paper capacitive transformer bushing, and initializing a clock to be 0 when the value is stable and basically remains unchanged within a preset time period t; then, the average value E of the electric field intensity amplitude of the oil paper capacitive transformer bushing in the first time period is monitored and obtainedx(0) Average value E of electric field intensity amplitude in (n-1) th periodx(n-1) T), average value E of electric field intensity amplitude in nth periodx(nT), wherein x ═ a, B, C; then, the change rate of the electric field intensity amplitude of the oil paper capacitive transformer bushing in the nth time period is compared with the (n-1) th time period, namely the change rate of the electric field intensity in the adjacent time period interval is obtainedx(n); then, the change rate of the electric field intensity amplitude of the oil paper capacitive transformer bushing in the nth time period is obtained, namely the change rate eta of the electric field intensity in the total time periodx(n) of (a). The calculation formula is shown as formula (1):
if obtained, isx(n) is kept atLess than 0, and ηx(n) when the water content reaches 10% -20%, the phase casing is considered to be slightly damp; if obtained, isx(n) is kept not less than 0, and ηx(n) when the water content reaches 20% -30%, the phase casing is considered to have moderate moisture inside; if obtained, isx(n) is kept not less than 0, and ηx(n) greater than 30%, the phase casing is considered to be severely internally dampened.
If in the kth time period, the three-phase bushing corresponds tox(k) Sudden significant changes, close in magnitude to each other, are presumed to be due to a change in the operating voltage of the transformer bushing or other environmental factors. At this time, the rate of change η of the electric field intensity within the overall time intervalx(n) needs to be rewritten into the expression form of formula (2) to eliminate the influence of the external environment change on the electric field intensity amplitude, which is specifically as follows:
(3) and responding to an access request of a client terminal, transmitting the moisture degree to the client terminal, and timely sensing and monitoring the internal defect of the oil paper capacitive transformer bushing which is wetted.
The utility model discloses detailed embodiment still provides an inside monitoring system that wets of oiled paper condenser transformer bushing for realize aforementioned utility model method, as shown in FIG. 1, be the utility model discloses the theory of operation schematic diagram of system embodiment, including state perception front end, backstage relay, high in the clouds server and customer end, wherein the backstage relay constitutes relay processing end with high in the clouds server jointly. The working principle is as follows: three state sensing front ends are arranged, and the axial component amplitudes of the power frequency electric field intensity near a sleeve flange of the A, B, C three-phase transformer, namely the electric field intensities of the oil paper capacitive transformer sleeves of the A phase, the B phase and the C phase, are monitored in real time respectively; the three state perception front ends send monitoring data to a background relay, and the background relay analyzes and processes the monitoring data by utilizing an internally-carried moisture analysis and identification algorithm to obtain the moisture degree of each phase of the three-phase transformer bushing; the background relay transmits the moisture degrees of all phases to the cloud server; the client terminal accesses the cloud server to acquire the working states of the state perception front end and the background relay and the degree of each phase of the oiled paper capacitive transformer bushing to be damped.
As shown in fig. 2, be the utility model discloses in the system embodiment the component structure schematic diagram of state perception front end, state perception front end is by miniature electric field probe, enlarge filtering module, first wireless communication module, first controller, lithium cell, battery voltage collection module and charge protection module and constitutes, wherein miniature electric field probe, enlarge filtering module, first controller, first wireless communication module order electric connection, in this embodiment, miniature electric field probe is used for surveying transformer bushing power frequency electric field intensity, little control unit (MicrocontrollerUnit, MCU module) is chooseed for use to first controller, Lora communication module is chooseed for use to first wireless communication module. The working principle of the state perception front end is as follows: the micro electric field probe works in a passive state; the amplifying and filtering module amplifies a weak voltage signal input by the micro electric field probe, filters a high-frequency electromagnetic interference component and outputs the high-frequency electromagnetic interference component to an ADC (analog to digital converter) port of the MCU module; the MCU module collects the power frequency electric field signals of the ADC port, further eliminates external interference in a software filtering mode, and then transmits the signals to the Lora communication module to realize wireless transparent transmission of data. The amplifying and filtering module, the Lora communication module and the MCU module in the state perception front end are powered by lithium batteries; the battery voltage acquisition module converts the voltage of the lithium battery into an ADC (analog to digital converter) signal which can be read by the MCU in a resistance voltage division mode, and the MCU module acquires a battery voltage signal at an ADC port and then transmits the signal to the Lora communication module; when the lithium battery feeds electricity, the lithium battery can be charged through the charging protection module through an external power supply.
For realizing low-power consumption, long-endurance on-line monitoring, state perception front end adopts software, hardware two kinds of modes to realize the low-power consumption operation, as shown in fig. 3, is the utility model discloses in the system embodiment the low-power consumption work flow schematic diagram of state perception front end, the software mode indicates promptly, and the MCU kernel gets into dormant mode, and MCU's consumption reaches minimum this moment. The hardware mode means that the MCU runs an instruction to cut off the power supply of the peripheral (the amplification and filtering module, and the Lora communication module) before entering the sleep mode, and the power consumption of the peripheral is completely changed to 0. The working logic of low power consumption and long endurance is that, initializing the clock, judging whether the clock enters a low power consumption mode clock, if not, the state perception front end normally works, namely monitoring and sending data; if so, the MCU module firstly triggers an instruction to disconnect the power supply of the peripheral (an amplification filtering module and a Lora communication module), then enters a sleep mode, and waits for waking up a clock; after entering the wake-up clock, the MCU module exits the sleep mode, the trigger instruction restores the power supply of the peripheral, and the state sensing front end continues to monitor and send data. The state perception front end adopts two modes of software and hardware to realize the on-line monitoring with low power consumption and long endurance, thereby fully ensuring the on-line rate of the system. When the state perception front end works, the state perception front end is adhered to an oil tank shell within 20cm of the radial distance of a transformer sleeve flange in a bundling or magnetic absorption mode, one phase transformer sleeve is installed on each phase transformer sleeve, and the phase transformer sleeves are not directly electrically connected with the sleeves, so that non-contact on-line monitoring is achieved.
As shown in fig. 4, it is the system embodiment of the present invention, the background relay is composed of a second controller, a second wireless communication module, a third wireless communication module, a lithium battery, a battery voltage collecting module and a charging protection module, wherein the second wireless communication module and the third wireless communication module are respectively electrically connected to the second controller. In this embodiment, the second controller adopts an MCU module, the second wireless communication module adopts a Lora communication module, and the third wireless communication module adopts a GPRS module. The GPRS module, the Lora communication module and the MCU module are powered by lithium batteries; when the lithium battery feeds electricity, the lithium battery can be charged through the charging protection module through an external power supply. The working principle of the background relay is as follows: the Lora communication module receives electric field data sent by the state perception front end and transmits the electric field data to the MCU module; the MCU module analyzes the received electric field data, analyzes and identifies whether the oiled paper condenser type bushing is internally damped or not by adopting a damping analysis and identification algorithm according to the variation trend of the electric field data, sends the power frequency electric field intensity amplitude and the transformer bushing state judgment result to the GPRS module, and then transmits the power frequency electric field intensity amplitude and the transformer bushing state judgment result to the cloud server through the GPRS module; the MCU module in the background relay also sends the battery voltage data of the state perception front end and the battery voltage data of the background relay to the GPRS module, and then the battery voltage data are transmitted to the cloud server, so that the working state monitoring of the front end and the background is realized.
As shown in fig. 5, is a schematic flow chart of the moisture analysis and identification algorithm in the method embodiment of the present invention, and its basic idea is:
(1) starting an MCU module of a background relay, receiving the electric field intensity of each photographic paper capacitive transformer bushing, solving the change rate of the amplitude of the electric field intensity compared between two adjacent time periods, finishing self-checking when the value is stable and is basically kept unchanged within a preset time period t, and initializing a clock to be 0;
(2) dividing the total monitoring time into a plurality of time intervals, and setting the time length of each time interval as T. Monitoring and obtaining the average value E of the electric field intensity amplitude of each oil paper capacitive transformer bushing in the first time periodx(0) Average value E of electric field intensity amplitude in (n-1) th periodx(n-1) T), average value E of electric field intensity amplitude in nth periodx(nT), wherein x ═ a, B, C; then, the change rate of the electric field intensity amplitude of the oil paper capacitive transformer bushing in the nth time period is compared with the (n-1) th time period, namely the change rate of the electric field intensity in the adjacent time period interval is obtainedx(n); then, the change rate of the electric field intensity amplitude of the oil paper capacitive transformer bushing in the nth time period is obtained, namely the change rate eta of the electric field intensity in the total time periodx(n) of (a). The calculation formula is shown as formula (1):
if obtained, isx(n) is kept not less than 0, and ηx(n) when the water content reaches 10% -20%, the phase casing is considered to be slightly damp; if obtained, isx(n) is kept not less than 0, and ηx(n) is 20% to 30%, the result is confirmedModerate moisture is generated in the phase sleeve; if obtained, isx(n) is kept not less than 0, and ηx(n) greater than 30%, the phase casing is considered to be severely internally dampened.
If in the kth time period, the three-phase bushing corresponds tox(k) Sudden significant changes, close in magnitude to each other, are presumed to be due to a change in the operating voltage of the transformer bushing or other environmental factors. At this time, the rate of change η of the electric field intensity within the overall time intervalx(n) needs to be rewritten into the expression form of formula (2) to eliminate the influence of the external environment change on the electric field intensity amplitude, which is specifically as follows:
in the present embodiment, the aforementioned "significant change" meansx(k) Greater than 10%, the foregoing "similar size" meansA(k)、B(k)、C(k) The deviation of the three values from their mean value is not more than 8%.
Taking the monitoring condition that the bushing A of the 35kV oil paper capacitive transformer of a certain transformer substation is affected with moisture as an example, a light moisture alarm is sent out in 11 months, 12 days and 9 am. In this example, T is 5 minutes and T is 1 hour. According to the damp analysis and identification algorithm, the electric field intensity near the flange reaches 8.5kV/m and E thereof is monitored during alarmingx(0) Rate of change of electric field intensity η over the total time interval, compared to 7.5kV/mx13.3 percent and more than 10 percent, and the change rate of the electric field intensity in the adjacent time intervalxNot less than 0, so a light moisture alarm is sent out. The monitoring values started to rise from 11 months and 10 days to the light moisture message, and about 48 hours are passed, which shows that once the moisture invades the transformer bushing in a large amount, obvious signs appear after several days. Through inspection, the flange disc of the monitored casing is not fastened and shifts, and when the local rain lasts for 11 months, rainwater enters from the flange gap and diffuses to the lower part of the insulation along the surface of the capacitor core, so that the lower half part of the oil paper insulation is obviously affected with damp. Sampling the obtained product with oilpaper and testing the water content to obtainReach its water content and be about 5%, accord with this embodiment monitoring result, confirmed the utility model discloses an validity.
The utility model discloses the system passes through near non-contact real-time supervision oiled paper condenser transformer bushing flange's power frequency electric field intensity to whether accurate judgement transformer bushing is inside to be dampened, in order to reach the purpose of in time learning transformer bushing running state, not only can compensate the not enough of current detection means, fill transformer bushing internal defect non-contact on-line monitoring technique's blank, can and the time discover latent fault defect moreover, further guarantee the operation of the safety and stability of super extra-high voltage transformer substation in the district under jurisdiction.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (6)
1. A moist monitoring system in oiled paper capacitive transformer bushing, wherein including state perception front end, relaying process end, customer's terminal station of communication connection with relaying process end of electric connection with state perception front end;
the state-aware front end: the method is used for acquiring the electric field intensity of the oiled paper capacitive transformer bushing;
the relay processing terminal: the device is used for identifying the moisture degree of the oilpaper capacitive transformer bushing based on the electric field intensity and pushing the moisture degree to a client terminal.
2. The system for monitoring the moisture inside the bushing of the oiled paper capacitive transformer according to claim 1, wherein the state sensing front end is provided with three flanges which are correspondingly arranged at the flanges of the bushings of the oiled paper capacitive transformer for the A phase, the B phase and the C phase and are used for correspondingly monitoring the axial component amplitudes of the power frequency electric field intensity at the flanges of the bushings of the oiled paper capacitive transformer for the A phase, the B phase and the C phase.
3. The oil paper condenser transformer bushing interior moisture monitoring system according to claim 1, wherein the relay processing end comprises a background relay electrically connected with the state sensing front end, and a cloud server respectively connected with the background relay and a client terminal in a communication manner;
the background relay: the device is used for solving the change rate of the electric field strength of the oiled paper condenser transformer bushing in the adjacent time interval and the total time interval based on the electric field strength and judging the degree of moisture of the oiled paper condenser transformer bushing based on the change rate of the electric field strength of the oiled paper condenser transformer bushing in the adjacent time interval and the total time interval;
the cloud server: and the moisture level is sent to the client terminal in response to the access request of the client terminal.
4. The oil paper capacitive transformer bushing interior moisture monitoring system according to claim 3, wherein the state-sensing front end performs low-power-consumption operation in a software or/and hardware manner, and comprises a miniature electric field probe, an amplification filtering module, a first controller and a first wireless communication module which are electrically connected in sequence;
the miniature electric field probe is used for converting the power frequency electric field intensity of the oiled paper capacitive transformer bushing into an electric signal;
the amplifying and filtering module is used for amplifying or/and filtering interference components of the electric signals to obtain power frequency electric field signals;
the first controller is used for carrying out software filtering on the power frequency electric field signal;
the first wireless communication module is used for transmitting the power frequency electric field signal after the software filtering to the background relay.
5. The oil paper condenser transformer bushing interior moisture monitoring system of claim 4, wherein the background relay comprises a second controller, and a second wireless communication module and a third wireless communication module electrically connected thereto;
the second wireless communication module is used for receiving the power frequency electric field signal which is transmitted by the first wireless communication module and filtered by the software;
the second controller is used for analyzing the power frequency electric field signal filtered by the software and identifying the damp degree of the oiled paper capacitive transformer bushing;
the third wireless communication module is used for transmitting the moisture degree to a cloud server.
6. The oil paper condenser transformer bushing interior moisture monitoring system of claim 5, wherein the first controller or/and the second controller comprises an MCU module, the first wireless communication module or/and the second wireless communication module comprises a Lora communication module, and the third wireless communication module comprises a GPRS communication module.
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| CN113406462A (en) * | 2021-06-17 | 2021-09-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve pipe damp defect simulation method and preparation method |
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| CN113406462A (en) * | 2021-06-17 | 2021-09-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve pipe damp defect simulation method and preparation method |
| CN113406462B (en) * | 2021-06-17 | 2022-08-30 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve pipe damp defect simulation method and preparation method |
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