CN113567885B - Ground wire insulator fault early warning device and early warning method thereof - Google Patents
Ground wire insulator fault early warning device and early warning method thereof Download PDFInfo
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- CN113567885B CN113567885B CN202110832493.5A CN202110832493A CN113567885B CN 113567885 B CN113567885 B CN 113567885B CN 202110832493 A CN202110832493 A CN 202110832493A CN 113567885 B CN113567885 B CN 113567885B
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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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/54—Testing for continuity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The application relates to the field of insulators, in particular to a ground wire insulator fault early warning device and a ground wire insulator fault early warning method, wherein the ground wire insulator fault early warning device comprises a differential current detection module and a bridging detection module; the differential current detection module comprises three current transformers, three filters and two capacitors; the first current transformer and the second current transformer are sleeved on the ground wire and are respectively positioned at two sides of the ground wire clamp; first output coil and filter D p1 In series, a third output coil is connected with a filter D p2 Connected in series, and connected in parallel with the capacitor C at the same name end of the two output coils p A first rectifying circuit is formed by connection; the homonymous ends of the second output coil and the fourth output coil are connected in series and are connected with a filter D s Capacitor C s The first rectifying circuit is connected in series to form a first rectifying circuit; the bridging detection module comprises a bridging line and two wire wrapping clamps; the two wire wrapping clamps are sleeved on the ground wire, and the third current transformer is connected with the two wire wrapping clamps through the jumper wire. The technical problem of poor inspection effect on the ground wire insulator is solved.
Description
Technical Field
The application relates to the field of insulators, in particular to a ground wire insulator fault early warning device and an early warning method thereof.
Background
The transmission line overhead ground wire is used to protect the high voltage line from lightning strikes. Because the high-voltage circuit generates induced voltage on the ground wire, the ground wire is not suitable to be grounded at each base tower, and then the ground wire is suspended by using a ground wire insulator with a claw electrode. At the junction of the insulator under Fang Jinju and ground, the ground typically corrodes, breaks or ablates due to dissimilar metal connections, mechanical wear, and induced current heating, reducing the electrical and mechanical properties of the junction. In addition, if the ground wire insulator has a claw electrode short circuit fault, the ground current at the fault position can be increased, the heating value at the connection position of the ground wire and the insulator is increased, and the wire degradation is accelerated.
At present, whether the horn electrode is short-circuited or close to a short-circuited state can be found only by a line inspection method. Only when the lead wire at the connection part of the insulator and the ground wire is seriously deteriorated and the temperature of the contact point is obviously increased, the problem of ground wire deterioration can be detected by the thermal infrared imager. In the operation process, the ground wire current is small (tens of amperes and below), and even if the problem of poor contact or broken strands in the ground wire occurs, the temperature variation of a fault point is small. And defects or faults can be found only when broken strands of the ground wire are exposed.
Disclosure of Invention
Accordingly, an object of the present application is to provide a ground wire insulator fault early warning device and an early warning method thereof, which are used for monitoring the electrical performance of the connection position of an insulator and an electric wire, and realizing the protection of the connection position against too small ground impedance or too large series impedance, so as to effectively solve the technical problem of poor inspection effect of the ground wire insulator in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
the ground wire insulator fault early warning device is applied to a ground wire insulator, and a ground wire jacket of the ground wire insulator is arranged on a ground wire and comprises a differential current detection module and a bridging detection module;
the differential current detection module comprises a first current transformer, a second current transformer, a third current transformer and a filter D p1 Filter D p2 Filter D s Capacitor C p And capacitor C s ；
The first current transformer and the second current transformer are sleeved on the ground wire, and the first current transformer and the second current transformer are respectively positioned at two sides of the ground wire clamp;
the first current transformer comprises a first output coil and a second output coil;
the second current transformer comprises a third output coil and a fourth output coil;
the first output coil and the filter D p1 The third output coil is connected in series with a filter D p2 The same-name ends of the first output coil and the third output coil are connected in parallel and then rectified with the capacitor C p Connecting to form a first rectifying circuit;
the homonymous ends of the second output coil and the fourth output coil are connected in series and are connected with the filter D s The capacitor C s The first rectifying circuit is connected in series to form a first rectifying circuit;
the bridging detection module comprises a bridging wire and two wire wrapping clamps;
the two wire wrapping clamps are sleeved on the ground wire and are respectively positioned at two sides of the ground wire clamp;
two ends of the jumper wire are respectively connected with two envelope clamps, and the third current transformer is sleeved on the jumper wire.
Preferably, in the above ground wire insulator fault early warning device, the first output coil, the second output coil, the third output coil and the fourth output coil are all provided with a common resistor R in parallel 2 。
Preferably, in the above ground wire insulator fault early warning deviceThe first output coil, the second output coil, the third output coil and the fourth output coil are all provided with zinc oxide piezoresistors R in parallel connection 1 。
Preferably, in the above ground wire insulator fault warning device, the wire wrapping clip and the jumper wire are aluminum products with the same specification parameters as the ground wire.
An early warning method based on the ground wire insulator fault early warning device comprises the following steps:
s1, judging whether the first rectifying circuit has power frequency induction current or not, if so, judging that the differential current detection module works normally, and then executing S2; if not, judging that the differential current detection module does not work;
s2, judging whether the voltage amplitude of the output signal of the second rectifying circuit exceeds a first threshold U th1 If so, judging that the impedance to the ground of the connection part of the insulator and the ground wire is too small; if not, executing S3;
s3, judging whether the voltage amplitude of the output signal of the third transformer exceeds a second threshold U th2 If so, judging that the series impedance of the connection part of the insulator and the ground wire is overlarge; if not, judging that the ground wire insulator is normal.
Preferably, in the foregoing early warning method, the determining whether the first rectifying circuit has a power frequency induction current specifically includes:
judging the capacitor C p Voltage U of (2) p Whether it is non-zero.
Preferably, in the foregoing early warning method, it is determined whether the voltage amplitude of the output signal of the second rectifying circuit exceeds the first threshold U th1 The method comprises the following steps:
judging the capacitor C s Voltage U of (2) s Whether the amplitude of the signal exceeds a first threshold value U th1 。
Preferably, in the foregoing early warning method, it is determined that the impedance to ground at the connection position of the insulator and the ground line is too small, so as to obtain a conclusion that there may be a short-circuit fault of the sheep electrode.
Preferably, in the foregoing early warning method, it is determined that the series impedance at the connection position of the insulator and the ground wire is too large, so as to obtain a conclusion that the broken strand defect of the ground wire may exist.
Preferably, in the foregoing early warning method, after it is determined that the differential current detection module does not operate, the ground wire insulator fault early warning device is re-checked and started.
Compared with the prior art, the beneficial effects of this application are:
on one hand, by installing current transformers at the left end and the right end of the connection part of the insulator and the ground wire, the monitoring of the ground current is realized, and the problem that continuous energy supply is difficult to obtain when the ground point current of the ground wire insulator is directly monitored is solved; on the other hand, through both ends about jumper connection insulator and ground wire junction, not only can monitor the too big defect of junction series impedance, solved the technical problem that prior art is poor to the inspection effect of ground wire insulator effectively, can realize the reposition of redundant personnel when series impedance is too big moreover, avoid the electric current to continuously act on the defect point of junction and lead to the defect further to enlarge.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural diagram of a ground wire insulator fault early warning device provided in an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a differential current detection module of a ground wire insulator fault early warning device according to an embodiment of the present application;
fig. 3 is a schematic current flow diagram of a ground wire insulator fault early warning device according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a ground wire insulator fault early warning method provided in an embodiment of the present application.
In the figure:
the three-phase current transformer comprises a ground wire insulator 1, a claw electrode 11, a ground wire clamp 2, a ground wire 3, a first current transformer 411, a second current transformer 412, a third current transformer 413, a differential current detection module 42, a packet clamp 51 and a jumper 52.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the embodiments of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, interchangeably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the terms in the embodiments of the present application will be understood by those of ordinary skill in the art in a specific context.
The transmission line overhead ground wire is used to protect the high voltage line from lightning strikes. Since the high voltage line generates induced voltage on the ground wire, it is not preferable to ground the ground wire at each base tower, and thus the ground wire 3 is suspended using the ground wire insulator 1 with the claw pole 11. At the junction of the insulator under Fang Jinju and the ground wire (i.e., the ground wire clip 2), the ground wire typically corrodes, breaks or ablates due to dissimilar metal connection, mechanical wear, and induced current heating, reducing the electrical and mechanical properties of the junction. In addition, if the claw pole 11 of the ground wire insulator 1 fails due to short circuit, the ground current at the fault location increases, the heat generation amount at the connection location of the ground wire and the insulator increases, and the wire degradation is accelerated. At present, whether the horn electrode 11 is short-circuited or close to a short-circuited state can be found only by a line inspection method. Only when the lead wire at the connection part of the insulator and the ground wire is seriously deteriorated and the temperature of the contact point is obviously increased, the problem of ground wire deterioration can be detected by the thermal infrared imager. In the operation process, the ground wire current is small (tens of amperes and below), and even if the problem of poor contact or broken strands in the ground wire occurs, the temperature variation of a fault point is small. And defects or faults can be found only when broken strands of the ground wire are exposed. The embodiment provides a ground wire insulator fault early warning device, which effectively solves the technical problem that the inspection effect of the ground wire insulator in the prior art is poor.
Referring to fig. 1-3, an embodiment of the present application provides a ground wire insulator fault early warning device, which is applied to a ground wire insulator 1, wherein a ground wire clamp 2 of the ground wire insulator 1 is sleeved on a ground wire 3, and includes a differential current detection module 42 and a bridging detection module; the differential current detection module 42 includes a first current transformer 411, a second current transformer 412, a third current transformer 413, and a filter D p1 Filter D p2 Filter D s Capacitor C p And capacitor C s The method comprises the steps of carrying out a first treatment on the surface of the The first current transformer 411 and the second current transformer 412 are sleeved on the ground wire, and the first current transformer 411 and the second current transformer 412 are respectively positioned at two sides of the ground wire clamp; the first current transformer 411 includes a first output coil and a second output coil; second current transformer 412 bagThe third output coil and the fourth output coil are included; first output coil and filter D p1 In series, a third output coil is connected with a filter D p2 The same-name ends of the first output coil and the third output coil are connected in parallel and then rectified and connected with a capacitor C in series p Connecting to form a first rectifying circuit; the homonymous ends of the second output coil and the fourth output coil are connected in series and are connected with a filter D s Capacitor C s The first rectifying circuit is connected in series to form a first rectifying circuit; the crossover detection module comprises a crossover wire 52 and two wrap clamps 51; the two wire wrapping clamps 51 are sleeved on the ground wire, and the two wire wrapping clamps 51 are respectively positioned at two sides of the ground wire clamp; two ends of the jumper wire 52 are respectively connected with two wire wrapping clamps 51, and a third current transformer 413 is sleeved on the jumper wire 52.
More specifically, the first rectifier circuit is configured to provide power to the measurement and judgment circuit of the differential current detection module 42, and the second rectifier circuit and the third current transformer 413 are configured to provide signals to the measurement and judgment circuit of the differential current detection module 42; the package clamp 51 is closer to the ground wire clamp than the first current transformer 411 and the second current transformer 412, and the third current transformer 413 is preferably disposed at an intermediate position of the jumper wire 52; referring to fig. 2, assume that the current through the first current transformer 411 is I 1 The current through the second current transformer 412 is I 2 The current passing through the ground wire clamp is I 3 The current through the third current transformer 413 is I 4 。
On the one hand, by installing the current transformers at the left end and the right end of the connection part of the insulator and the ground wire, the monitoring of the ground current is realized, and the problem that continuous energy supply is difficult to obtain when the ground point current of the ground wire insulator is directly monitored is solved; on the other hand, the jumper 52 is connected with the left end and the right end of the connection part of the insulator and the ground wire, so that the defect that the series impedance of the connection part is overlarge can be monitored, the technical problem that the inspection effect of the ground wire insulator is poor in the prior art is effectively solved, and the shunt can be realized when the series impedance is overlarge, so that the defect further expands due to the fact that the current continuously acts on the defect point of the connection part is avoided.
Further, in the present embodimentWherein the first output coil, the second output coil, the third output coil and the fourth output coil are all provided with a common resistor R in parallel connection 2 . The common resistor is used for forming a current path of the output coil so that each output coil forms a corresponding current flow direction and the requirement of differential current detection is met.
More specifically, the general resistance R 2 In the preferred case of this embodiment, the respective output coils may be added with corresponding resistors (e.g., adjustable resistors) to form a closed circuit according to actual needs.
Further, in this embodiment, the first output coil, the second output coil, the third output coil and the fourth output coil are all provided with a zinc oxide varistor R in parallel 1 . Zinc oxide piezoresistor R 1 The lightning current coupling device can be used for discharging the lightning current coupled into the output coil, and is beneficial to playing a certain role in protecting the output coil.
Further, in this embodiment, the package clip 51 and the jumper 52 are both made of aluminum with the same specification parameters as the ground wire, which is beneficial to preventing galvanic corrosion at the connection, thereby prolonging the service life of the ground wire insulator.
The embodiment also provides an early warning method based on the ground wire insulator fault early warning device, and the early warning method comprises the following steps:
s1, judging whether the first rectifying circuit has power frequency induction current or not, if so, judging that the differential current detection module 42 works normally, and then executing S2; if not, the differential current detection module 42 is judged to be not working;
s2, judging whether the voltage amplitude of the output signal of the second rectifying circuit exceeds a first threshold U th1 If so, judging that the impedance to the ground of the connection part of the insulator and the ground wire is too small; if not, executing S3;
s3, judging whether the voltage amplitude of the output signal of the third transformer exceeds a second threshold U th2 If so, judging that the series impedance of the connection part of the insulator and the ground wire is overlarge; if not, judging that the ground wire insulator is normal.
More specifically, if the first rectifying circuit has no power frequency induced current, that is, the measurement judging circuit of the differential current detecting module 42 has no power supply, the differential current detecting module 42 does not operate; if the first rectifying circuit has a power frequency induced current, that is, the measurement judging circuit of the differential current detecting module 42 has energy supply, the differential current detecting module 42 works normally; whether the ground impedance at the connection of the insulator and the ground line is too small or the series impedance at the connection of the insulator and the ground line is too large is determined to be an abnormal situation of the ground line insulator.
Further, in this embodiment, determining whether the first rectifying circuit has a power frequency induced current is specifically: judgment capacitor C p Voltage U of (2) p Whether it is non-zero and not close to zero. When the capacitor C p Voltage U of (2) p Is not zero and is not close to zero, i.e. I 1 And I 2 Neither is zero nor is close to zero, i.e. both the first current transformer 411 and the second current transformer 412 are operating normally, thereby verifying that the measurement judgment circuit of the differential current detection module 42 has energy supply, and that the differential current detection module 42 is operating normally.
Further, in the present embodiment, it is determined whether the voltage amplitude of the output signal of the second rectifying circuit exceeds the first threshold value U th1 The method comprises the following steps: judgment capacitor C s Voltage U of (2) s Whether the amplitude of the signal exceeds a first threshold value U th1 . When the capacitor C s Voltage U of (2) s The amplitude exceeds a first threshold U th1 And judging that the impedance to the ground of the connection part of the insulator and the ground wire is too small, and the short circuit fault of the sheep electrode possibly exists.
Further, in this embodiment, it is determined that the impedance to ground at the junction of the insulator and the ground line is too small, and the current value I 3 And (3) the method is larger, and the conclusion that the short circuit fault of the sheep electrode can exist is obtained.
Further, in this embodiment, it is determined that the series impedance at the connection of the insulator and the ground line is too large, and the current value I 4 And (5) larger, the conclusion that the broken strand defect of the ground wire possibly exists is obtained.
Further, in the present embodiment, after it is determined that the differential current detection module 42 is not operating, the ground insulator failure warning device is re-checked and started. The operation is beneficial to effectively eliminating the abnormal situation caused by the poor contact of the ground wire insulator fault early warning device, so that the ground wire insulator fault early warning device is reasonably utilized to measure and detect the abnormal situation of the ground wire insulator.
The beneficial effects of this embodiment are:
(1) Compared with the traditional inspection method or infrared imaging method, the method can realize real-time monitoring of faults or defects of the ground wire insulator, discover problems in time and quickly solve the problems;
(2) Compared with other on-line monitoring equipment of the transmission line, the invention realizes the self energy taking of the device without additionally installing a photovoltaic panel or other external power supply;
(3) The invention not only provides a detection method for the defect of overlarge series impedance of the ground wire (usually caused by broken strands of the ground wire), but also provides a shunt measure for inhibiting the further development of the defect;
(4) The invention has simple structure, convenient installation and good economy, and is suitable for the occasion of overhead ground wires.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The ground wire insulator fault early warning device is applied to a ground wire insulator, and a ground wire jacket of the ground wire insulator is arranged on a ground wire, and is characterized by comprising a differential current detection module and a bridging detection module;
the differential current detection module comprises a first current transformer, a second current transformer, a third current transformer and a filter D p1 Filter D p2 Filter D s Capacitor C p And capacitor C s ；
The first current transformer and the second current transformer are sleeved on the ground wire, and the first current transformer and the second current transformer are respectively positioned at two sides of the ground wire clamp;
the first current transformer comprises a first output coil and a second output coil;
the second current transformer comprises a third output coil and a fourth output coil;
the first output coil and the filter D p1 The third output coil is connected in series with a filter D p2 The same-name ends of the first output coil and the third output coil are connected in parallel and then rectified with the capacitor C p Connecting to form a first rectifying circuit;
the homonymous ends of the second output coil and the fourth output coil are connected in series and are connected with the filter D s The capacitor C s The first rectifying circuit is connected in series to form a first rectifying circuit;
the bridging detection module comprises a bridging wire and two wire wrapping clamps;
the two wire wrapping clamps are sleeved on the ground wire and are respectively positioned at two sides of the ground wire clamp;
two ends of the jumper wire are respectively connected with two envelope clamps, and the third current transformer is sleeved on the jumper wire.
2. The earth wire insulator fault early warning device according to claim 1, wherein the first output coil, the second output coil, the third output coil and the fourth output coil are all provided with a common resistor R in parallel 2 。
3. According to claim 1The earth wire insulator fault early warning device is characterized in that the first output coil, the second output coil, the third output coil and the fourth output coil are all provided with zinc oxide piezoresistors R in parallel 1 。
4. The ground wire insulator fault early warning device according to claim 1, wherein the wire wrapping clamp and the jumper wire are aluminum products with the same specification parameters as the ground wire.
5. An early warning method based on the ground wire insulator fault early warning device according to any one of claims 1 to 4, characterized in that the early warning method comprises the following steps:
s1, judging whether the first rectifying circuit has power frequency induction current or not, if so, judging that the differential current detection module works normally, and then executing S2; if not, judging that the differential current detection module does not work;
s2, judging whether the voltage amplitude of the output signal of the second rectifying circuit exceeds a first threshold U th1 If so, judging that the impedance to the ground of the connection part of the insulator and the ground wire is too small; if not, executing S3;
s3, judging whether the voltage amplitude of the output signal of the third transformer exceeds a second threshold U th2 If so, judging that the series impedance of the connection part of the insulator and the ground wire is overlarge; if not, judging that the ground wire insulator is normal.
6. The method of claim 5, wherein determining whether the first rectifying circuit has a power frequency induced current is specifically:
judging the capacitor C p Voltage U of (2) p Whether it is non-zero.
7. The method of claim 5, wherein determining whether the voltage magnitude of the output signal of the second rectifying circuit exceeds a first threshold U th1 The method comprises the following steps:
judging the capacitor C s Voltage of (2)U s Whether the amplitude of the signal exceeds a first threshold value U th1 。
8. The method of claim 5, wherein the conclusion that there is a possibility of a short circuit fault of the sheep electrode is obtained after determining that the impedance of the connection of the insulator and the ground line to the ground is too small.
9. The method according to claim 5, wherein after determining that the series impedance at the connection of the insulator and the ground wire is too high, a conclusion is made that a broken strand defect of the ground wire may exist.
10. The method according to claim 5, wherein the ground insulator fault warning device is re-checked and started after the differential current detection module is determined to be not operated.
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| CN202110832493.5A CN113567885B (en) | 2021-07-22 | 2021-07-22 | Ground wire insulator fault early warning device and early warning method thereof |
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| CN202110832493.5A CN113567885B (en) | 2021-07-22 | 2021-07-22 | Ground wire insulator fault early warning device and early warning method thereof |
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