CN110987653A - Bending fatigue resistance testing method for 500kV wind deflection prevention jumper wire insulator - Google Patents
Bending fatigue resistance testing method for 500kV wind deflection prevention jumper wire insulator Download PDFInfo
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- CN110987653A CN110987653A CN201911087374.0A CN201911087374A CN110987653A CN 110987653 A CN110987653 A CN 110987653A CN 201911087374 A CN201911087374 A CN 201911087374A CN 110987653 A CN110987653 A CN 110987653A
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Abstract
The invention relates to a bending fatigue resistance testing method for a 500kV wind deflection prevention jumper wire insulator, wherein the 500kV wind deflection prevention jumper wire insulator comprises a core body and a core rod, and further comprises a frame and a supporting frame, wherein a hoisting mechanism is arranged on the frame, and the method sequentially comprises the following steps: step one, testing the bending deflection value y1Step two, detecting whether visual visible cracks exist at the connecting part of the core rod and the core body by using a swing fatigue test and step three, testing a bending deflection value y2The invention has the advantages that: by bending deflection value y1The amplitude of the swing fatigue test in the step two is set, the safety performance of the swing fatigue test can be improved, the influence on the 500kV wind-proof deflection jumper wire insulator due to overlarge amplitude is prevented, the reliability of the swing fatigue test is improved, and the bending deflection value y is compared2And deflection value y of bending1Numerical value of (1)Deflection over bend value y2And deflection value y of bending1The ratio of the voltage of the 500kV wind deflection prevention jumper wire insulator is used for judging whether the 500kV wind deflection prevention jumper wire insulator is a qualified product or not, so that a tester can quickly and accurately obtain a test result, and the test accuracy is improved.
Description
Technical Field
The invention relates to a bending fatigue resistance testing method for a 500kV wind deflection prevention jumper wire insulator.
Background
In recent years, current-guiding jumper wires on 500kV power transmission lines in a plurality of regions nationwide cause flashover under the influence of strong wind to cause tripping accidents, the frequency of the tripping accidents exceeds the acceptable limit of safe operation of a power system, and great harm is brought to the safe operation of the power lines. According to statistics, 500kV and above lines governed by the national network company in 2018 have wind-induced partial tripping for more than 100 times, and the range relates to Jiangsu, Zhejiang, Anhui, Hubei, Henan, Shandong, Shanxi, Beijing, Hebei, northeast and the like. The wind bias discharge has wide range, multiple times and great influence, and is most frequent in typhoon and frequent in typhoon areas in coastal regions. Different from lightning flashover and operation impact flashover, most of windage flashover occurs under working voltage, and reclosing generally cannot be successfully carried out, so that line outage is caused, and great loss is caused to national economy. According to the analysis of the recent windage yaw tripping accidents, the reasons for jumper windage yaw flashover mainly include the following points.
Strong winds are the most direct cause of flashover due to windage yaw of the jumper. The traditional jumper string insulator adopts conventional porcelain and glass, the insulator string inclines towards the direction of a tower under the condition that the wind speed exceeds the designed wind speed, the air gap distance between a lead and the tower is reduced, and flashover occurs when the air gap distance cannot meet the minimum discharge voltage requirement; the composite insulator is adopted for line climbing adjustment, and wind deflection check is not carried out, so that discharge can be caused even if the composite insulator is light in self weight and a heavy hammer swings in a large amplitude during wind deflection.
At present, the main solutions are as follows: 1. the windproof stay wire is reinforced, and the stay wire is fixed on a line hardware fitting to fix a lead, so that the windproof stay wire can play a good role in inhibiting wind deflection generated on the line. However, the line hardware is easy to be damaged by fatigue due to the inflexible rotation of windage yaw and long-time stress. Therefore, the windproof stay wire is additionally arranged, so that potential safety hazards exist in the operation of the line; 2. the heavy hammer is additionally arranged, but the effect of the additional arrangement of the heavy hammer is limited, so that the heavy hammer is not a main measure for fundamentally solving the problem of the hanging wind drift flashover; 3. adopting a windage yaw prevention insulator: the insulator has small windage yaw swing amplitude, and the electric clearance between a wire and a tower is increased; the installation is reliable, but the wire wind dances more seriously for 500kV and above lines because of the larger insulation outer dimension.
The 500kV line is still provided with the conventional jumper string due to the limitation of the bending resistance of the composite insulator core rod. The jumper string of the 500kV power transmission line is generally assembled by vertically hanging or additionally hanging a heavy hammer piece at home and abroad, and the assembly mode cannot fundamentally solve the problem of windage yaw flashover of the jumper; and coastal strong wind area probably adopts V type wire jumper cluster equipment mode, because it needs increase a antithetical couplet insulator, the wire jumper cross arm also need lengthen simultaneously to can cause the great increase of investment. Because the jumper string of the 500kV line is long and has large wind load, and the lead is in a four-split form, the vertically fixed wind deflection preventing jumper insulator string can form large bending moment at the fixed position of the iron tower.
The 500kV wind-proof biased jumper insulator is a product suitable for 500kV lines, the 500kV wind-proof biased jumper insulator needs to be subjected to a bending fatigue test, and compared with a 220kV wind-proof biased jumper insulator, the 500kV wind-proof biased jumper insulator is far longer than the 220kV wind-proof biased jumper insulator in length and weight, so that the 500kV wind-proof biased jumper insulator cannot be tested by adopting an original 220kV testing method, the safety performance during testing is reduced, and the testing result is easily influenced.
Disclosure of Invention
The invention aims to provide a bending fatigue resistance testing method for a 500kV wind-proof biased jumper wire insulator, and solves the technical problem that the bending fatigue resistance testing method for the 500kV wind-proof biased jumper wire insulator does not exist in the prior art, and further certain risks are caused.
In order to solve the technical problems, the invention is realized by the following technical scheme: the 500kV wind-deflection-prevention jumper insulator bending fatigue resistance test method comprises the following steps of:
the method comprises the following steps: fixedly connecting one end of a 500kV wind-deflection-prevention jumper insulator to a rack, applying a rated bending load to the other end of the 500kV wind-deflection-prevention jumper insulator, keeping for 1min, and testing the bending deflection value y of the 500kV wind-deflection-prevention jumper insulator1The rated bending load is 2.5 kN;
step two: mounting and fixing the 500kV wind deflection prevention jumper wire insulator tested in the step one on a hoisting mechanism, and performing a swing fatigue test on the 500kV wind deflection prevention jumper wire insulator through the hoisting mechanism, wherein the test amplitude is + y1/2，-y1/4, the frequency of vibration is 0.65Hz, and the frequency of vibration is 5 multiplied by 104Secondly, observing the connecting part of the core rod and the core body, and preventing the connecting part of the core rod and the core body from generating visually visible cracks;
step three: repeating the first step, testing the bending deflection value y of the 500kV wind deflection prevention jumper wire insulator after the second fatigue test2If y is21.2y or less1And judging the 500kV windage yaw prevention jumper wire insulator to be a qualified product if y is the case2Greater than 1.2y1And judging that the 500kV windage yaw jumper wire insulator is a defective product.
Preferably, the rack comprises a horizontal part and a vertical part, the horizontal part is arranged at the top end of the vertical part, the rack is installed on the ground by the vertical part, the support frame is arranged on the ground below the horizontal part, the hoisting mechanism is arranged on the horizontal part, the vertical part comprises a vertical frame and a horizontal cross rod arranged on the frame, and a connecting part is arranged on the horizontal cross rod.
Preferably, the connecting portion include stand and the fixed plate of setting on the stand, prevent wind one end of deviating from the wire jumper insulator and pass through bolt assembly and install on the fixed plate.
Preferably, the vertical portion further comprises a mounting plate and a foundation bolt, the mounting plate is arranged at the bottom end of the vertical frame, and the foundation bolt is arranged on the mounting plate.
Preferably, the horizontal part comprises a horizontal frame and a horizontal sliding rail, the hoisting mechanism is arranged on the horizontal sliding rail, and the horizontal sliding rail is provided with a limit switch.
Preferably, the hoisting mechanism comprises an electric hoist and a connecting rope, and the connecting rope is provided with a hoisting ring connected with the electric hoist.
Preferably, the support frame comprises a base and a support seat, the base is provided with a jack connected with the support seat, and the support seat is provided with a placing groove.
Preferably, a protection pad is arranged in the placing groove.
In conclusion, the invention has the advantages that: 1. testing the bending deflection value y through the step one1Step two, detecting whether visual visible cracks exist at the connecting part of the core rod and the core body by using a swing fatigue test and step three, testing a bending deflection value y2By bending deflection value y1The amplitude of the swing fatigue test in the step two is set, the safety performance of the swing fatigue test can be improved, the influence on the 500kV wind-proof deflection jumper wire insulator due to overlarge amplitude is prevented, the reliability of the swing fatigue test is improved, and the bending deflection value y is compared2And deflection value y of bending1By the value of the deflection of the bend y2And deflection value y of bending1The ratio of judging whether 500kV prevent wind partial jumper wire insulator is the certified product, enable the fast accurate result that obtains the test of testing personnel, improve the rate of accuracy of test, reduce the human error of test, whole experimental simple process can detect simultaneously through the deviceThe bending resistance and fatigue resistance of the 500kV wind deflection prevention jumper wire insulator can ensure the reliability of a swing fatigue test through a hoisting mechanism, and the stability of a rated bending load during the test can be ensured through a tension sensor;
2. one end of the wind-deflection-preventing jumper insulator is fixedly arranged on the horizontal part, the other end of the wind-deflection-preventing jumper insulator is connected with the lifting mechanism, the tensile load of the lifting mechanism on the wind-deflection-preventing jumper insulator is collected in real time by the tensile sensor during the test, the stability of the load during the test is ensured, the wind-deflection-preventing jumper insulator only needs to be lifted and lowered by the lifting mechanism during the test, the swinging fatigue test of the wind-deflection-preventing jumper insulator is realized by the lifting and lowering of the wind-deflection-preventing jumper insulator, the overall test effect is good, the wind-deflection-preventing jumper insulator is convenient to rapidly install, the support frame is arranged, the wind-deflection-preventing jumper insulator can be supported, the contact with the ground during the lowering of the wind-deflection-preventing jumper insulator is reduced, the damage during the test of the wind-deflection-preventing jumper insulator is avoided, and the, the horizontal cross rod can not only realize the installation of the wind deflection prevention jumper wire insulator, but also improve the strength of the whole vertical part;
3. the connecting part is arranged into a structure of the upright post and the fixing plate, and one end of the wind deflection prevention jumper wire insulator is arranged on the fixing plate through the bolt assembly, so that the fixing quality of the wind deflection prevention jumper wire insulator can be improved, and the wind deflection prevention jumper wire insulator is convenient to install and disassemble;
4. through the arrangement of the mounting plate and the foundation bolts, the mounting plate can improve the contact area of the vertical frame and the ground, and the vertical frame can be stably fixed on the ground;
5. the horizontal part is arranged into the horizontal frame and the horizontal slide rail, so that the sliding straightness of the lifting mechanism on the horizontal part can be ensured, the sliding displacement of the lifting mechanism on the horizontal slide rail is limited through the limit switch, and the safety performance of the wind deflection prevention jumper wire insulator is tested in the process;
6. the hoisting mechanism is arranged into the electric hoist and the connecting rope, and the hoisting mechanism is connected with the electric hoist through the hoisting ring on the connecting rope, so that the integral installation efficiency is improved, the connecting rope can realize the stable fixation of the windage yaw jumper wire insulator, the fixation quality is improved, and the fixation quality of the windage yaw jumper wire insulator in the test process is ensured;
7. the supporting frame is arranged into a structure of the base and the supporting seat, so that the effect of supporting one end of the wind deflection prevention jumper wire insulator can be realized, the height of the supporting seat on the base can be adjusted through the jack arranged on the base, the vertical shaking test of the wind deflection prevention jumper wire insulator can be realized, and the wind deflection prevention jumper wire insulator can be effectively adjusted according to different types of wind deflection prevention jumper wire insulators;
8. the protection pad is arranged, and the anti-wind-bias jumper insulator can be protected in the descending process of the hoisting mechanism, so that the contact force between the anti-wind-bias jumper insulator and the placing groove is greatly reduced, and the anti-wind-bias jumper insulator is prevented from being damaged.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic view of the apparatus of the present invention;
fig. 2 is a schematic structural view of the support frame of the present invention.
Reference numerals:
the device comprises a frame 1, a horizontal part 2, a horizontal frame 21, a horizontal sliding rail 22, a limit switch 23, a vertical part 3, a vertical frame 31, a horizontal cross bar 32, a connecting part 33, a vertical column 34, a fixing plate 35, a bolt assembly 36, a mounting plate 37, anchor bolts 38, a support frame 4, a base 41, a support seat 42, a jack 43, a placement groove 44, a protection pad 45, a lifting mechanism 5, an electric hoist 51, a connecting rope 52, a lifting ring 53 and a tension sensor 6.
Detailed Description
The 500kV wind-deflection-prevention jumper insulator bending fatigue resistance test method comprises the following steps of:
the method comprises the following steps: will 50One end of the 0kV wind-bias-resistant jumper insulator is fixedly connected to the rack, then a rated bending load is applied to the other end of the 500kV wind-bias-resistant jumper insulator, the bending deflection value y of the 500kV wind-bias-resistant jumper insulator is tested after the insulator is kept for 1min1The rated bending load is 2.5 kN;
step two: mounting and fixing the 500kV wind deflection prevention jumper wire insulator tested in the step one on a hoisting mechanism, and performing a swing fatigue test on the 500kV wind deflection prevention jumper wire insulator through the hoisting mechanism, wherein the test amplitude is + y1/2，-y1/4, the frequency of vibration is 0.65Hz, and the frequency of vibration is 5 multiplied by 104Secondly, observing the connecting part of the core rod and the core body, and preventing the connecting part of the core rod and the core body from generating visually visible cracks;
step three: repeating the first step, testing the bending deflection value y of the 500kV wind deflection prevention jumper wire insulator after the second fatigue test2If y is21.2y or less1And judging the 500kV windage yaw prevention jumper wire insulator to be a qualified product if y is the case2Greater than 1.2y1And judging that the 500kV windage yaw jumper wire insulator is a defective product.
Testing the bending deflection value y through the step one1Step two, detecting whether visual visible cracks exist at the connecting part of the core rod and the core body by using a swing fatigue test and step three, testing a bending deflection value y2By bending deflection value y1The amplitude of the swing fatigue test in the step two is set, the safety performance of the swing fatigue test can be improved, the influence on the 500kV wind-proof deflection jumper wire insulator due to overlarge amplitude is prevented, the reliability of the swing fatigue test is improved, and the bending deflection value y is compared2And deflection value y of bending1By the value of the deflection of the bend y2And deflection value y of bending1The ratio of judging whether 500kV prevent wind partial jumper insulator be qualified, enable the fast accurate result that obtains the test of detection personnel, improve the rate of accuracy of test, reduce the human error of test, whole test simple process, can detect 500kV prevent wind partial jumper insulator's bending resistance and fatigue performance simultaneously through the device, can ensure through hoisting mechanism and sway fatigue test's reliability, tension sensor can ensureThe stability of the rated bending load during the test is ensured.
As shown in fig. 1 and 2, the frame 1 includes a horizontal portion 2 and a vertical portion 3, the horizontal portion 2 is disposed at a top end of the vertical portion 3, the frame 1 is mounted on the ground by means of the vertical portion 3, the support frame 4 is disposed on the ground below the horizontal portion 2, the lifting mechanism 5 is disposed on the horizontal portion 2, the vertical portion 3 includes a vertical frame 31 and a horizontal cross bar 32 disposed on the frame, the horizontal cross bar 32 is provided with a connecting portion 33, one end of the windbreak wire insulator is fixedly mounted on the horizontal portion 2, the other end of the windbreak wire insulator is connected to the lifting mechanism 5, and the tensile load of the lifting mechanism 5 on the windbreak wire insulator during the test is collected by a tensile sensor in real time, so as to ensure the stability of the load during the test, and only the lifting mechanism 5 needs to perform a reciprocating motion of ascending and descending on the windbreak wire insulator during the test, realize preventing wind partial patch cord insulator's fatigue test that sways through preventing wind partial patch cord insulator's rising and decline, overall test is effectual, be favorable to preventing wind partial patch cord insulator's quick installation, support frame 4's setting, can play the effect of support to preventing wind patch cord insulator, and can reduce prevent wind partial patch cord insulator decline in-process and the contact on ground, the damage of preventing wind partial patch cord insulator test in-process has been avoided, set vertical portion 3 to vertical frame 31 and horizontal cross bar 32, horizontal cross bar 32 can not only realize preventing wind partial patch cord insulator's installation, and can improve the intensity of whole vertical portion 3.
Connecting portion 33 includes stand 34 and the fixed plate 35 of setting on stand 34, prevent wind the one end of inclined to one side wire jumper insulator and pass through bolt assembly 36 and install on fixed plate 35, set connecting portion 33 to the structure of stand 34 and fixed plate 35, will prevent wind the one end of inclined to one side wire jumper insulator and pass through bolt assembly 36 and install on fixed plate 35, can improve the fixed quality of preventing wind the inclined to one side wire jumper insulator, and the installation is dismantled conveniently, vertical portion 3 still includes mounting panel 37 and rag bolt 38, mounting panel 37 sets up the bottom at vertical frame 31, rag bolt 38 sets up on mounting panel 37, and through the setting of mounting panel 37 and rag bolt 38, mounting panel 37 can improve the area of contact on vertical frame 31 and ground, ensures that vertical frame 31 can be steady fixed subaerial.
The horizontal part 2 comprises a horizontal frame 21 and a horizontal sliding rail 22, the hoisting mechanism 5 is arranged on the horizontal sliding rail 22, the horizontal sliding rail 22 is provided with a limit switch 23, the horizontal part 2 is arranged into the horizontal frame 21 and the horizontal sliding rail 22, the straightness of the hoisting mechanism 5 sliding on the horizontal part 2 can be ensured, the limit switch 23 is used for limiting the sliding displacement of the hoisting mechanism 5 on the horizontal sliding rail 22, the safety performance of the windproof eccentric jumper wire insulator in the test process is tested, the hoisting mechanism 5 comprises an electric hoist 51 and a connecting rope 52, the connecting rope 52 is provided with a hoisting ring 53 connected with the electric hoist 51, the hoisting mechanism 5 is arranged into the electric hoist 51 and the connecting rope 52, the hoisting ring 53 on the connecting rope 52 is connected with the electric hoist 51, the integral installation efficiency is improved, and the connecting rope 52 can realize the stable fixation of the windproof eccentric jumper wire insulator, the fixing quality is improved, and the fixing quality of the windage yaw prevention jumper wire insulator in the testing process is ensured.
The supporting frame 4 comprises a base 41 and a supporting seat 42, a jack 43 connected with the supporting seat 42 is arranged on the base 41, the supporting seat 42 is provided with the placing groove 44, and the supporting frame 4 is arranged into the structure of the base 41 and the supporting seat 42, so that not only can the effect of supporting one end of the insulator which is used for preventing the wind deflection jumper wire be realized, and the height of the supporting seat 42 on the base 41 can be adjusted by the jack 43 arranged on the base 41, thereby realizing the up-and-down shaking test of the windage yaw jumper insulator, and effectively adjusting the windage yaw jumper insulator according to different types of windage yaw jumper insulators, arranging a protective pad 45 in the placing groove 44 and arranging the protective pad 45, when the hoisting mechanism 5 descends, the wind deflection preventing jumper wire insulator can be protected, the contact force between the wind deflection preventing jumper wire insulator and the placing groove 44 is greatly reduced, and therefore the wind deflection preventing jumper wire insulator is prevented from being damaged.
Other embodiments of the present invention than the preferred embodiments described above will be apparent to those skilled in the art from the present invention, and various changes and modifications can be made therein without departing from the spirit of the present invention as defined in the appended claims.
Claims (8)
1. The bending fatigue resistance test method for the 500kV wind deflection prevention jumper wire insulator comprises a core body and core rods arranged at two ends of the core body, and is characterized in that: the device comprises a rack and a support frame, a hoisting mechanism is arranged on the rack, a tension sensor is arranged on the hoisting mechanism, and the method sequentially comprises the following steps:
the method comprises the following steps: fixedly connecting one end of a 500kV wind-deflection-prevention jumper insulator to a rack, applying a rated bending load to the other end of the 500kV wind-deflection-prevention jumper insulator, keeping for 1min, and testing the bending deflection value y of the 500kV wind-deflection-prevention jumper insulator1The rated bending load is 2.5 kN;
step two: mounting and fixing the 500kV wind deflection prevention jumper wire insulator tested in the step one on a hoisting mechanism, and performing a swing fatigue test on the 500kV wind deflection prevention jumper wire insulator through the hoisting mechanism, wherein the test amplitude is + y1/2，-y1/4, the frequency of vibration is 0.65Hz, and the frequency of vibration is 5 multiplied by 104Secondly, observing the connecting part of the core rod and the core body, and preventing the connecting part of the core rod and the core body from generating visually visible cracks;
step three: repeating the first step, testing the bending deflection value y of the 500kV wind deflection prevention jumper wire insulator after the second fatigue test2If y is21.2y or less1And judging the 500kV windage yaw prevention jumper wire insulator to be a qualified product if y is the case2Greater than 1.2y1And judging that the 500kV windage yaw jumper wire insulator is a defective product.
2. The bending fatigue resistance testing method for the 500kV wind deflection prevention jumper wire insulator according to claim 1, characterized in that: the frame includes horizontal part and vertical portion, the horizontal part sets up the top at vertical portion, the frame relies on vertical portion to install subaerial, the support frame sets up on the ground of horizontal part below, lift by crane the mechanism setting on the horizontal part, vertical portion includes vertical frame and the horizontal cross-bar of setting on the frame, be equipped with connecting portion on the horizontal cross-bar.
3. The bending fatigue resistance testing method for the 500kV wind deflection prevention jumper wire insulator according to claim 2, characterized in that: the connecting portion include stand and the fixed plate of setting on the stand, prevent wind one end of deviating from the wire jumper insulator and pass through bolt assembly and install on the fixed plate.
4. The bending fatigue resistance testing method for the 500kV wind deflection prevention jumper wire insulator according to claim 2, characterized in that: vertical portion still includes mounting panel and rag bolt, the mounting panel sets up in the bottom of vertical frame, rag bolt sets up on the mounting panel.
5. The bending fatigue resistance testing method for the 500kV wind deflection prevention jumper wire insulator according to claim 2, characterized in that: the horizontal part comprises a horizontal frame and a horizontal sliding rail, the hoisting mechanism is arranged on the horizontal sliding rail, and a limit switch is arranged on the horizontal sliding rail.
6. The bending fatigue resistance testing method for the 500kV wind deflection prevention jumper wire insulator according to claim 5, characterized in that: the hoisting mechanism comprises an electric hoist and a connecting rope, and the connecting rope is provided with a hoisting ring connected with the electric hoist.
7. The bending fatigue resistance testing method for the 500kV wind deflection prevention jumper wire insulator according to claim 1, characterized in that: the support frame includes base and supporting seat, be equipped with the jack that links to each other with the supporting seat on the base, be equipped with the standing groove on the supporting seat.
8. The bending fatigue resistance testing method for the 500kV wind deflection prevention jumper wire insulator according to claim 7, characterized in that: and a protection pad is arranged in the placing groove.
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| CN201911087374.0A CN110987653A (en) | 2019-11-08 | 2019-11-08 | Bending fatigue resistance testing method for 500kV wind deflection prevention jumper wire insulator |
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| CN201911087374.0A CN110987653A (en) | 2019-11-08 | 2019-11-08 | Bending fatigue resistance testing method for 500kV wind deflection prevention jumper wire insulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763169A (en) * | 2020-12-01 | 2021-05-07 | 中国电力科学研究院有限公司 | Horizontally-arranged insulator wind vibration simulation test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763169A (en) * | 2020-12-01 | 2021-05-07 | 中国电力科学研究院有限公司 | Horizontally-arranged insulator wind vibration simulation test device |
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