CN114220638A - High-voltage wire outlet device for extra-high voltage transformer and reactor and fault diagnosis method thereof - Google Patents
High-voltage wire outlet device for extra-high voltage transformer and reactor and fault diagnosis method thereof Download PDFInfo
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- CN114220638A CN114220638A CN202111392971.1A CN202111392971A CN114220638A CN 114220638 A CN114220638 A CN 114220638A CN 202111392971 A CN202111392971 A CN 202111392971A CN 114220638 A CN114220638 A CN 114220638A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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Abstract
本发明属于电力设备在线监测技术领域，具体涉及用于特高压变压器、电抗器的高压出线装置及其故障诊断方法，高压出线装置包括：出线装置本体、高压导体、盆式支撑绝缘子、微水探测器、气体密度继电器、硫化物气体检测模块和局放在线检测模块，所述出线装置本体为L型管状结构，所述高压导体通过盆式支撑绝缘子架设于所述出线装置本体中；高压出线装置的故障诊断方法，通过密度继电器监测六氟化硫气体密度，微水探测监测六氟化硫气体内部的水分含量，通过硫化物气体检测模块检测除六氟化硫之外的硫化物气体浓度，通过局放检测模块检测出线装置本体内部是否存在放电产生的超声信号和特高频信号，进而根据监测结果进行故障诊断评估。
The invention belongs to the technical field of on-line monitoring of electric power equipment, and in particular relates to a high-voltage outlet device for ultra-high voltage transformers and reactors and a fault diagnosis method thereof. device, gas density relay, sulfide gas detection module and local online detection module, the outlet device body is an L-shaped tubular structure, and the high-voltage conductor is erected in the outlet device body through a basin-type supporting insulator; the high-voltage outlet device The fault diagnosis method is to monitor the density of sulfur hexafluoride gas through the density relay, monitor the moisture content inside the sulfur hexafluoride gas through micro water detection, and detect the concentration of sulfide gas other than sulfur hexafluoride through the sulfide gas detection module. The partial discharge detection module detects whether there are ultrasonic signals and UHF signals generated by discharge inside the body of the outgoing device, and then performs fault diagnosis and evaluation according to the monitoring results.
Description
Technical Field
The invention belongs to the technical field of power equipment online monitoring, and particularly relates to a high-voltage wire outlet device for an extra-high voltage transformer and a reactor and a fault diagnosis method thereof.
Background
The high-voltage wire outlet device is one of key parts of an alternating-current extra-high voltage transformer or an electric reactor, is a shielding and insulating device for a lead wire connecting a high-voltage winding of the transformer and the electric reactor with a sleeve, is an important component of main insulation of the extra-high voltage transformer and the electric reactor, and directly influences the overall insulation electrical performance of the extra-high voltage transformer and the electric reactor by the structure of the high-voltage wire outlet device. The high-voltage wire outlet device is used for supporting a lead and playing an insulating role, operates in a high-field-intensity area and needs to meet the tests of electricity, magnetism, heat, machinery and the like, and the raw material selection, the structural design, the manufacturing process and the like of the wire outlet device are all important for the safe and stable operation of the wire outlet device.
With the increasing quantity of the ultra-high voltage transformers and reactors in China and the gradual increase of the operation years, some defects are gradually exposed in the operation process of the ultra-high voltage transformers and reactors, because the high-voltage middle wire outlet device generally adopts a 90-degree right-angle structure, partial discharge is easily generated due to uneven field intensity distribution in the operation process, the content of dissolved gas in oil is increased, and even sleeve explosion, main transformer ignition and other accidents occur in severe cases, so that serious hidden dangers are brought to the safe operation of equipment. At present, an oil-filled outlet device generally judges the internal operation condition through regular oil chromatographic analysis, has certain hysteresis, and cannot monitor the inside in real time.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a high-voltage wire outlet device for an extra-high voltage transformer and a reactor and a fault diagnosis method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that:
a high-pressure device of being qualified for next round of competitions for extra-high voltage transformer, reactor, its characterized in that includes: the wire outlet device comprises a wire outlet device body, a high-voltage conductor, a basin-type supporting insulator, a micro water detector, a gas density relay, a sulfide gas detection module and a partial discharge online detection module, wherein the wire outlet device body is of an L-shaped tubular structure, one end of the wire outlet device body is connected with an oil tank, the other end of the wire outlet device body is connected with a high-voltage sleeve, a lead connector of the high-voltage sleeve extends into the wire outlet device, the high-voltage conductor is erected in the wire outlet device body through the basin-type supporting insulator, one end of the high-voltage conductor is connected with a high-voltage winding, the other end of the high-voltage conductor is connected with a lead connector of the high-voltage sleeve, the basin-type supporting insulators are two, namely a basin-type supporting insulator A and a basin-type supporting insulator B, the basin-type supporting insulator A is arranged close to the high-voltage winding, and the basin-type supporting insulator B is arranged close to the lead connector, a cavity is formed among the wire outlet device body, the basin-type supporting insulator A and the basin-type supporting insulator B, sulfur hexafluoride is filled in the cavity, the micro water detector, the gas density relay, the sulfide gas detection module and the partial discharge online detection module are all arranged on the inner wall of the wire outlet device body and located in the cavity, and the sulfide gas detection module and the partial discharge online detection module are mature technologies in the existing electric power monitoring industry, so detailed description of specific structures of the sulfide gas detection module and the partial discharge online detection module is omitted.
Further, the method also comprises the following steps: the device comprises a micro water detector, a gas density relay, a sulfide gas detection module and a partial discharge online detection module, wherein the micro water detector, the gas density relay, the sulfide gas detection module and the partial discharge online detection module are all connected with the acquisition and transmission unit, and the acquisition and transmission unit processes detection signals and transmits the detection signals to the monitoring background.
Furthermore, a sealing gasket is arranged at the joint of the basin-type supporting insulator and the high-voltage conductor, so that sulfur hexafluoride gas in the cavity can be prevented from leaking out, and oil in an oil tank can be prevented from entering the outlet device body.
Furthermore, the surface of the basin-type supporting insulator adopts an umbrella skirt structure, so that the creepage distance can be ensured.
The fault diagnosis method for the high-voltage wire outlet device of the extra-high voltage transformer and the reactor comprises the following steps:
s1, monitoring the density of sulfur hexafluoride gas through a density relay, detecting and monitoring the moisture content in the sulfur hexafluoride gas through micro-water, and if the gas density is lower than the rated value by 0.5Mpa or the moisture content in the gas exceeds the rated value by 300ppm, giving an alarm to a monitoring background;
s2, detecting the concentration of sulfide gas except sulfur hexafluoride through a sulfide gas detection module, and generating a first characteristic value A according to the concentration detection result;
s3, detecting whether an ultrasonic signal and an ultrahigh frequency signal generated by discharge exist in the wire device body through the partial discharge detection module, generating a second characteristic value B according to the detection result of the ultrasonic signal, and generating a third characteristic value C according to the detection result of the ultrahigh frequency signal;
s4, taking the first characteristic value A, the second characteristic value B and the third characteristic value C as base numbers, multiplying after performing power operation to obtain a transformer outlet device defect diagnosis evaluation coefficient P, and judging the defect grade of the high-voltage outlet device by using the fault diagnosis evaluation coefficient P;
and S5, the acquisition and transmission unit transmits the fault diagnosis evaluation coefficient, the fault defect grade and the related data which are judged to be the defects to a monitoring background for early warning.
Further, in step S2, if the concentration detection result is less than 2ppm, a is 0, if the concentration detection result is 2ppm to less than 15ppm, a is 1, and if the concentration detection result is 15ppm or more, a is 2;
in step S3, if the difference between the ultrasonic signal detection result and the background value is less than 10mV, B is 0, if the difference between the ultrasonic signal detection result and the background value is greater than or equal to 10mV and less than 20mV, B is 1, and if the difference between the ultrasonic signal detection result and the background value is greater than or equal to 20mV, B is 2;
if the detection result of the ultrahigh frequency signal is not present, C is 0, and if the detection result of the ultrahigh frequency signal is not present, C is 1;
in step S4, the formula of the failure diagnosis evaluation coefficient P is:
judging the defect grade of the high-voltage wire outlet device according to the fault diagnosis evaluation coefficient P, wherein the judging mode is as follows:
further, in the step S5, if the defect level is determined to be a general defect, a serious defect, or a crisis defect in the step S4, the collecting and sending unit sends the fault diagnosis evaluation coefficient, the fault defect level, and the related data to the monitoring background.
Compared with the prior art, the invention has the following beneficial effects.
The invention utilizes sulfur hexafluoride gas to replace original oil, avoids accidents such as explosion, ignition and the like caused by the content rise of dissolved gas in the oil, and simultaneously carries out on-line monitoring on various data in the high-voltage wire outlet device through the micro-water detector, the gas density relay, the sulfide gas detection module and the partial discharge on-line detection module, thereby realizing the real-time monitoring of the inside of the high-voltage wire outlet device and being beneficial to the safe operation of power equipment.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of a basin support insulator a of the present invention.
In the figure: the device comprises a wire outlet device body 1, a high-voltage conductor 2, a micro water detector 3, a gas density relay 4, a sulfide gas detection module 5, a partial discharge online detection module 6, an oil tank 7, a lead connector 8, a high-voltage winding 9, a basin-type supporting insulator A10, a basin-type supporting insulator B11, a cavity 12 and a sealing gasket 13.
Detailed Description
The present invention is further illustrated by the following specific examples.
As shown in fig. 1, the high-voltage wire outlet device for the extra-high voltage transformer and the reactor comprises: the wire outlet device comprises a wire outlet device body 1, a high-voltage conductor 2, a basin-type supporting insulator, a micro water detector 3, a gas density relay 4, a sulfide gas detection module 5 and a local discharge online detection module 6, wherein the wire outlet device body 1 is of an L-shaped tubular structure, one end of the wire outlet device body 1 is connected with an oil tank 7, the other end of the wire outlet device body 1 is connected with a high-voltage sleeve, a lead connector 8 of the high-voltage sleeve extends into the wire outlet device body 1, the high-voltage conductor 2 is erected in the wire outlet device body 1 through the basin-type supporting insulator, as shown in figure 2, a sealing gasket 13 is arranged at the joint of the basin-type supporting insulator and the high-voltage conductor 2, the surface of the basin-type supporting insulator adopts an umbrella skirt structure, one end of the high-voltage conductor 2 is connected with a high-voltage winding 9, and the other end of the high-voltage conductor 2 is connected with the lead connector 8 of the high-voltage sleeve, the improved coil outlet device is characterized in that the two basin-type supporting insulators are a basin-type supporting insulator A10 and a basin-type supporting insulator B11, the basin-type supporting insulator A10 is arranged close to the high-voltage winding 9, the basin-type supporting insulator B11 is arranged close to the lead connector 8, a cavity 12 is formed among the coil outlet device body 1, the basin-type supporting insulator A10 and the basin-type supporting insulator B11, sulfur hexafluoride is filled in the cavity 12, and the micro water detector 3, the gas density relay 4, the sulfide gas detection module 5 and the partial discharge online detection module 6 are all arranged on the inner wall of the coil outlet device body 1 and located in the cavity 12.
Further comprising: the device comprises a micro water detector 3, a gas density relay 4, a sulfide gas detection module 5 and a partial discharge online detection module 6 which are connected with the acquisition and transmission unit, wherein the acquisition and transmission unit processes detection signals and transmits the detection signals to the monitoring background.
The fault diagnosis method for the high-voltage wire outlet device of the extra-high voltage transformer and the reactor comprises the following steps:
s1, monitoring the density of sulfur hexafluoride gas through a density relay, detecting and monitoring the moisture content in the sulfur hexafluoride gas through micro-water, and if the gas density is lower than the rated value by 0.5Mpa or the moisture content in the gas exceeds the rated value by 300ppm, giving an alarm to a monitoring background;
s2, detecting the concentration of sulfide gas except sulfur hexafluoride through a sulfide gas detection module, and generating a first characteristic value A according to the concentration detection result;
if the concentration detection result is less than 2ppm, a is 0, if the concentration detection result is greater than or equal to 2ppm and less than 15ppm, a is 1, if the concentration detection result is greater than or equal to 15ppm, a is 2;
s3, detecting whether an ultrasonic signal and an ultrahigh frequency signal generated by discharge exist in the wire device body through the partial discharge detection module, generating a second characteristic value B according to the detection result of the ultrasonic signal, and generating a third characteristic value C according to the detection result of the ultrahigh frequency signal;
if the difference between the ultrasonic signal detection result and the background value is less than 10mV, B is 0, if the difference between the ultrasonic signal detection result and the background value is more than or equal to 10mV and less than 20mV, B is 1, and if the difference between the ultrasonic signal detection result and the background value is more than or equal to 20mV, B is 2;
if the detection result of the ultrahigh frequency signal is not present, C is 0, and if the detection result of the ultrahigh frequency signal is not present, C is 1;
s4, taking the first characteristic value A, the second characteristic value B and the third characteristic value C as base numbers, multiplying after performing power operation to obtain a transformer outlet device defect diagnosis evaluation coefficient P, and judging the defect grade of the high-voltage outlet device by using the fault diagnosis evaluation coefficient P;
the formula of the fault diagnosis evaluation coefficient P is as follows:
judging the defect grade of the high-voltage wire outlet device according to the fault diagnosis evaluation coefficient P, wherein the judging mode is as follows:
and S5, the acquisition and sending unit sends the fault diagnosis evaluation coefficient, the fault defect grade and the related data which are judged to be the defects to a monitoring background for early warning, the defect grade is judged to be a general defect, a serious defect or a crisis defect, and the acquisition and sending unit sends the fault diagnosis evaluation coefficient, the fault defect grade and the related data to the monitoring background.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.
Claims (7)
1. A high-pressure device of being qualified for next round of competitions for extra-high voltage transformer, reactor, its characterized in that includes: the wire outlet device comprises a wire outlet device body (1), a high-voltage conductor (2), a basin-type supporting insulator, a micro water detector (3), a gas density relay (4), a sulfide gas detection module (5) and a local discharge online detection module (6), wherein the wire outlet device body (1) is of an L-shaped tubular structure, one end of the wire outlet device body (1) is connected with an oil tank (7), the other end of the wire outlet device body (1) is connected with a high-voltage sleeve, a lead connector (8) of the high-voltage sleeve extends into the wire outlet device body (1), the high-voltage conductor (2) is erected in the wire outlet device body (1) through the basin-type supporting insulator, one end of the high-voltage conductor (2) is connected with a high-voltage winding (9), the other end of the high-voltage conductor (2) is connected with the lead connector (8) of the high-voltage sleeve, two basin-type supports are arranged, be basin formula support insulator A (10) and basin formula support insulator B (11) respectively, basin formula support insulator A (10) are close to high voltage winding (9) and set up, basin formula support insulator B (11) are close to lead connector (8) and set up, it forms cavity (12) to be qualified for the next round of competitions between device body (1), basin formula support insulator A (10) and the basin formula support insulator B (11), cavity (12) intussuseption is filled with sulfur hexafluoride, little water detector (3), gas density relay (4), sulphide gas detection module (5), partial discharge on-line measuring module (6) all set up on the inner wall of device body (1) of being qualified for the next round of competitions and are located in cavity (12).
2. The high-voltage wire outlet device for the extra-high voltage transformer and the reactor as claimed in claim 1, further comprising: the device comprises a micro water detector (3), a gas density relay (4), a sulfide gas detection module (5) and a partial discharge online detection module (6), wherein the micro water detector, the gas density relay, the sulfide gas detection module and the partial discharge online detection module are all connected with the acquisition and transmission unit, and the acquisition and transmission unit processes detection signals and transmits the detection signals to the monitoring background.
3. The high-voltage wire outlet device for the extra-high voltage transformer and the reactor as claimed in claim 1, wherein a sealing gasket (13) is arranged at the joint of the basin-shaped supporting insulator and the high-voltage conductor (2).
4. The high-voltage wire outlet device for the extra-high voltage transformer and the reactor as claimed in claim 1, wherein the surface of the basin-shaped supporting insulator adopts a shed structure.
5. The fault diagnosis method for the high-voltage wire outlet device of the extra-high voltage transformer and the reactor is characterized by comprising the following steps of:
s1, monitoring the density of sulfur hexafluoride gas through a density relay, detecting and monitoring the moisture content in the sulfur hexafluoride gas through micro-water, and if the gas density is lower than the rated value by 0.5Mpa or the moisture content in the gas exceeds the rated value by 300ppm, giving an alarm to a monitoring background;
s2, detecting the concentration of sulfide gas except sulfur hexafluoride through a sulfide gas detection module, and generating a first characteristic value A according to the concentration detection result;
s3, detecting whether an ultrasonic signal and an ultrahigh frequency signal generated by discharge exist in the wire device body through the partial discharge detection module, generating a second characteristic value B according to the detection result of the ultrasonic signal, and generating a third characteristic value C according to the detection result of the ultrahigh frequency signal;
s4, taking the first characteristic value A, the second characteristic value B and the third characteristic value C as base numbers, multiplying after performing power operation to obtain a transformer outlet device defect diagnosis evaluation coefficient P, and judging the defect grade of the high-voltage outlet device by using the fault diagnosis evaluation coefficient P;
and S5, the acquisition and transmission unit transmits the fault diagnosis evaluation coefficient, the fault defect grade and the related data which are judged to be the defects to a monitoring background for early warning.
6. The method for diagnosing the fault of the high-voltage outlet device for the extra-high voltage transformer and the reactor as claimed in claim 5, wherein in the step S2, if the concentration detection result is less than 2ppm, A is 0, if the concentration detection result is greater than or equal to 2ppm and less than 15ppm, A is 1, and if the concentration detection result is greater than or equal to 15ppm, A is 2;
in step S3, if the difference between the ultrasonic signal detection result and the background value is less than 10mV, B is 0, if the difference between the ultrasonic signal detection result and the background value is greater than or equal to 10mV and less than 20mV, B is 1, and if the difference between the ultrasonic signal detection result and the background value is greater than or equal to 20mV, B is 2;
if the detection result of the ultrahigh frequency signal is not present, C is 0, and if the detection result of the ultrahigh frequency signal is not present, C is 1;
in step S4, the formula of the failure diagnosis evaluation coefficient P is:
judging the defect grade of the high-voltage wire outlet device according to the fault diagnosis evaluation coefficient P, wherein the judging mode is as follows:
7. the method for diagnosing the faults of the high-voltage wire outlet device for the extra-high voltage transformer and the reactor as claimed in claim 6, wherein in the step S5, if the fault grade is determined to be a general fault, a serious fault or a crisis fault in the step S4, the collecting and sending unit sends the fault diagnosis evaluation coefficient, the fault grade and the related data to a monitoring background.
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| CN114220638B CN114220638B (en) | 2024-06-25 |
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Address after: No.6 Qingnian Road, Yingze Street, Yingze District, Taiyuan City, Shanxi Province, 030000 Patentee after: State Grid Shanxi Electric Power Co., Ltd. Electric Power Science Research Institute Country or region after: China Address before: 030001 Qingnian Road, Shanxi, No. 6, Patentee before: STATE GRID ELECTRIC POWER Research Institute OF SEPC Country or region before: China |