CN210323239U - Test system suitable for multi-gear transmission conductor deicing fault research - Google Patents
Test system suitable for multi-gear transmission conductor deicing fault research Download PDFInfo
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- CN210323239U CN210323239U CN201920410181.3U CN201920410181U CN210323239U CN 210323239 U CN210323239 U CN 210323239U CN 201920410181 U CN201920410181 U CN 201920410181U CN 210323239 U CN210323239 U CN 210323239U
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Abstract
The application relates to a test system suitable for many grades of transmission line deicing fault research, include: the wire scaling module comprises a long rope, fixing supports for fixing two ends of the long rope and a traction support between the fixing supports for suspending the long rope; the deicing control module comprises a relay and an electromagnet; the tension measuring module comprises a tension sensor and a dynamic strain gauge; the monocular camera module comprises a high-speed camera, a calibration plate and a marker; and the calculation processing module comprises a processor connected with the camera and the dynamic strain gauge. The utility model has the advantages that: multiple parameters are adjustable, and the applicable research range is wide; the breakthrough of the field from the inexistence to the inexistence based on the reduced scale model test research is realized, and the method has great promoting significance on related research; can build in indoor, it is convenient to install, and the subassembly is easily processed and is equipped with, and the practicality is strong.
Description
Technical Field
The application belongs to the technical field of power transmission and distribution, and particularly relates to a test system suitable for multi-gear transmission conductor deicing fault research.
Background
The icing of the power transmission line refers to a natural phenomenon that water or rainfall in the air is frozen to form frost. Under natural conditions such as specific temperature and wind, the ice coating of the power transmission line falls off to cause vertical vibration and transverse swing of the power transmission line, which is also called ice jumping in engineering. In the process of ice-shedding jumping of the power transmission line, gaps between conductors of all phases and between the conductors and the ground wire are possibly smaller than corresponding insulation gap requirements, so that electric accidents such as interphase flashover, tripping and wire burning are caused, even mechanical accidents such as breakage of the power transmission tower, tower collapse, wire breakage and hardware damage are caused by severe change of wire tension, and the safe operation of the power transmission line is seriously influenced.
Aiming at the deicing fault of the lead, most scholars use numerical simulation to research, and research based on tests is few. The existing research aiming at the problem of wire ice shedding jumping is mainly based on theory and finite element numerical simulation, and lacks extensive experimental research. The test of the true line has many limitations such as high cost and poor operability. Based on finite element numerical simulation, although the whole process of ice shedding jump can be well simulated, the fact that whether the calculated result is real or not still needs to be verified by actual measurement tests. The ice-shedding jump test is performed on a true power transmission line by a fresh student, and is not beneficial to extensive parameter research due to inconvenient operation and high cost. Therefore, it is necessary to develop a scaling model test system which has good operability and can be performed indoors and is suitable for the research of the ice shedding jump fault of the multi-gear line.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in order to solve the defects in the prior art, the test system which is adjustable in multiple parameters, strong in operability and high in practical value and is suitable for the multi-gear power transmission conductor deicing fault research is provided.
The utility model provides a technical scheme that its technical problem adopted is:
a test system suitable for multi-gear transmission conductor deicing fault research comprises:
the wire scaling module comprises a long rope, fixing supports for fixing two ends of the long rope and a traction support for suspending the long rope between the fixing supports, wherein at least one traction support divides the long rope into at least two sections, and the long rope at least comprises an ice coating section on which a plurality of ice coating weights are suspended;
the deicing control module comprises a relay and an electromagnet, the electromagnet is fixed on the long rope, the ice-coated heavy object is hung below the electromagnet, and the relay is connected with the electromagnet and controls the current of the electromagnet so as to control the adsorption or the shedding of the ice-coated heavy object;
the tension measuring module comprises tension sensors and dynamic strain gauges, the tension sensors are connected to the ends of the long ropes at different sections, and the tension sensors measure tension change data of the long ropes and transmit the tension change data to the dynamic strain gauges;
the monocular camera module comprises a high-speed camera, a calibration plate and a marker, wherein the marker is fixed on the long rope, the calibration plate calibrates the camera, and the camera shoots and records displacement data of the marker;
and the calculation processing module comprises a processor connected with the camera and the dynamic strain gauge, the processor receives the displacement data recorded by the camera and calculates the maximum ice jump height of the long rope, and the processor receives the tension change data output by the dynamic strain gauge and calculates the maximum impact force of the long rope on the fixed support and the maximum unbalanced tension on the traction support.
In one embodiment, the traction bracket has two parts and divides the long rope into three parts, wherein the three parts respectively comprise an ice-coated part positioned in the middle and non-ice-coated parts positioned on two sides of the ice-coated part.
In one embodiment, the long rope is a steel wire rope with the diameter of less than 1 cm.
In one embodiment, a plurality of balancing weights are fixed on the long rope at intervals.
In one embodiment, the weights are of the same weight.
In one embodiment, the counterweight block is a stainless steel hollow circular tube, and the stainless steel hollow circular tube is sleeved on the long rope.
In one embodiment, two ends of the long rope are hung on the fixing bracket through turn-buckle screws.
In one embodiment, the long rope is suspended from the towing bracket by a suspension ring.
The utility model has the advantages that:
(1) multiple parameters are adjustable, and the application and research range is wide. The utility model discloses the system can expand transmission line deicing jump trouble (including ice jump height and unbalanced tension etc.) research to parameters such as span, discrepancy in elevation, initial tension, icing thickness, deicing rate, and applicable scope is wider.
(2) The breakthrough of the field from the inexistence to the inexistence based on the reduced scale model test research is realized, and the method has great promoting significance for related research.
(3) The utility model discloses the system can be in indoor buildding, and it is convenient to install, and the subassembly is easily processed and is equipped with, and the practicality is strong.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a schematic structural diagram of an embodiment of the present application;
FIG. 2 is a schematic view of a structural relationship between a long rope and a weight block according to an embodiment of the present application;
FIG. 3 is a cross-sectional view of the long rope and weight member according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of an ice shedding control module according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the system or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A test system suitable for multi-gear transmission conductor deicing fault research utilizes a plurality of module combinations to realize the simulation of transmission line deicing, please refer to FIG. 1, including:
the wire scaling module comprises a long rope 1, fixing supports 2 for fixing two ends of the long rope 1, and a traction support 3 used for suspending the long rope 1 between the fixing supports 2, wherein at least one traction support 3 divides the long rope 1 into at least two sections, and the long rope 1 at least comprises an ice coating section on which a plurality of ice coating weights 5 are suspended.
Referring to fig. 4, the deicing control module includes a relay 10 and electromagnets 4, the electromagnets 4 are fixed on the long rope 1, specifically, the electromagnets 4 are fixed on the icing section, the icing heavy object 5 is suspended below the electromagnets 4, each electromagnet 4 is connected to the relay 10, the relays 10 control the current of the electromagnets 4 to control the adsorption or the shedding of the icing heavy object 5, and the relay 10 is programmed to control the current change of the electromagnets 4 to control the deicing timing sequence, and the like. In one embodiment, the electromagnet 4 is a micro electromagnet 4, and the vibration process of the wire after ice removal is not influenced. Different numbers of electromagnets 4 can be added according to the needs, and the more the number of electromagnets 4 is, the more uniform icing state can be reflected. During the test, the electromagnet 4 is electrified to have adsorption force, and then the icing heavy object 5 is adsorbed on the electromagnet 4 to simulate the icing state of an actual line. Through programming the relay 10, the uniform and non-uniform deicing processes with different time sequences can be realized, when in deicing, the current of the corresponding electromagnet 4 is released, the icing heavy object 5 drops instantly, and the long rope 1 generates rebound vibration.
The tension measuring module comprises tension sensors and dynamic strain gauges 6, the tension sensors are connected to the ends of the long ropes 1 in different sections in series, the tension sensors measure tension change data of the long ropes 1 in the ice-shedding process and transmit the tension change data to the dynamic strain gauges 6, and therefore unbalanced tension, ice-shedding tension impact coefficients and the like are obtained.
The monocular camera module comprises a high-speed camera 8, a calibration plate and a marker, wherein the marker is fixed on the long rope 1 and used for setting a DIC (Digital Image Correlation) marker point, the calibration plate calibrates the position of the camera 8, the camera 8 shoots the movement of the marker point so as to shoot and record displacement data of the marker, in one embodiment, MATLAB software is used for analyzing the movement of the marker point so as to obtain the change of the marker displacement in the deicing process, and therefore the maximum ice jump height of the long rope 1 is obtained. During the test, the camera 8 is placed at a proper position, firstly the camera is calibrated by using a calibration plate, and then the deicing process is recorded.
The device further comprises a calculation processing module which comprises a processor 7 connected with the camera 8 and the dynamic strain gauge 6, the processor 7 receives displacement data recorded by the camera 8 and calculates the maximum ice jump height of the long rope 1, and the processor 7 receives tension change data output by the dynamic strain gauge 6 and calculates the maximum impact force of the long rope 1 on the fixed support 2 and the maximum unbalanced tension on the traction support 3. The processor 7 may be used to carry the MATLAB software described above.
The tension measuring module is used for measuring the change condition of tension in the ice-shedding process, so that unbalanced tension, ice-shedding tension impact coefficient and the like are obtained; and the monocular measuring module is used for obtaining the change of the displacement after the ice-shedding impact, so that the maximum ice jump height is obtained. The utility model discloses the system can be well according to prototype circuit parameter configuration test model, possesses good maneuverability and practicality.
In order to simulate a real power transmission line, in one embodiment, the traction bracket 3 has two parts and divides the long rope 1 into three parts, wherein the three parts respectively comprise an ice-coated part positioned in the middle and non-ice-coated parts positioned on two sides of the ice-coated part.
In order to simulate a real transmission line, in one embodiment, the long rope 1 is a steel wire rope with a diameter of less than 1 cm. In various embodiments, a steel wire rope with a diameter of several millimeters or even less than 1mm is used as the long rope 1 to form the main body of the wire scaling module, i.e., the wire pattern main body.
With reference to fig. 2 and fig. 3, in one embodiment, a plurality of weight blocks 9 are further fixed on the long rope 1 at intervals, and the weight blocks 9 are uniformly arranged to satisfy a reduction ratio to construct a reduced-scale sub-wire model.
To facilitate the adjustment of the weights, in one embodiment the weights 9 weigh the same.
In order to adjust the counterweight and stabilize the counterweight effect, in one embodiment, the counterweight 9 is a stainless steel hollow circular tube, and the stainless steel hollow circular tube is sleeved on the long rope 1.
The fixed support 2 provides vertical support and horizontal tension for the long rope 1, and the height of the fixed support meets the sag requirement of the model long rope 1, and the fixed support is equivalent to a tension tower in an actual line. In one embodiment, two ends of the long rope 1 are hung on the fixing support 2 through turnbuckles, so that the sag of the long rope 1 is conveniently adjusted, and the actual transmission conductor is subjected to simulation.
The traction bracket 3 corresponds to a tangent tower of an actual line, and in one embodiment, the long rope 1 is hung on the traction bracket 3 through a hanging ring which can deflect left and right to simulate the deflection of an actual transmission conductor.
To sum up, the beneficial effects of the utility model are that:
(1) multiple parameters are adjustable, and the application and research range is wide. The utility model discloses the system can expand transmission line deicing jump trouble (including ice jump height and unbalanced tension etc.) research to parameters such as span, discrepancy in elevation, initial tension, icing thickness, deicing rate, and applicable scope is wider.
(2) The breakthrough of the field from the inexistence to the inexistence based on the reduced scale model test research is realized, and the method has great promoting significance for related research.
(3) The utility model discloses the system can be in indoor buildding, and it is convenient to install, and the subassembly is easily processed and is equipped with, and the practicality is strong.
The utility model discloses be applied to split conductor upset fault research's step as follows:
step 10: and determining each similarity coefficient of the test model through a similarity theory according to the structure parameters of the prototype circuit, the material parameters of the prototype and the model wire and by combining the test site conditions.
The prototype circuit structure parameters include wire type, span, height difference, sag, ice coating thickness, ice shedding form, etc.
Determining span and sag parameters of the model wire in advance according to the condition of the model test site, and further determining a geometric similarity coefficient; and then selecting the material and specification of the model wire, measuring the Young modulus of the model wire through a tensile testing machine, further determining the density ratio, and determining the rest similarity coefficients through a similarity principle. Then, the weight of each accessory of the ice-shedding bar (ice-coating section) and the ice-shedding bar (non-ice-coating section) and the weight of the ice-coating heavy object 5 are determined according to the number of the electromagnets 4 and the mass and the number of the accessories (counter weights 9) of each bar by utilizing the similarity coefficient.
Step 20: the horizontal stress and sag of the wire pattern after ice coating were determined.
The method comprises the steps of firstly determining the initial horizontal tension and the dead weight of a model wire (a long rope 1) in an ice-coating-free state according to a force similarity coefficient and initial horizontal tension and linear density parameters of a prototype wire, and then calculating the horizontal stress and the sag of the ice-coated wire according to the fact that the linear length change quantity of the ice-coated wire is equal to the elastic deformation quantity.
Step 30: and (5) building a test lead system.
The accessory is a stainless steel hollow round pipe, the inner diameter of the round pipe is slightly larger than the diameter of the model wire, and the additional mass is conveniently stringed on the wire. In the test process, the additional mass and the electromagnet 4 are firstly stringed on the lead at equal intervals at a certain interval, and are fixed on the lead by using an electric melt glue gun, so that the additional mass and the lead cannot slide relatively; stringing a tension sensor at the end part of a lead, connecting the tension sensor with an upper lifting ring nut, and then hanging the tension sensor on brackets at two ends; the insulator string is connected with the end parts of the two gears, and then the insulator string is hung on the two middle brackets.
And connecting the electromagnet 4 with a controller, electrifying the electromagnet 4 and adsorbing an ice coating heavy object 5 on the electromagnet 4.
Then the horizontal tension and the sag of the wire are adjusted to a preset value through the lifting eye nut, and whether the sag is adjusted correctly can be checked through whether the tension sensor and the suspension string are completely vertical.
Step 40: and (5) carrying out a test.
The camera 8 is first put in place and calibrated while recording is started.
The corresponding electromagnet 4 is powered off in a certain time sequence by using the deicing control module according to a preset mode, so that the uniform or non-uniform deicing process is simulated. Meanwhile, the tension sensor and the camera 8 simultaneously record the tension of different positions of the wire and the change of the displacement of the mark point in the ice-shedding rebounding process until the wire reaches a stable state.
Step 50: and (6) data processing.
And copying the recorded video into a computer (processor), and carrying out image analysis by using MATLAB software to obtain a displacement change time course of the mark point so as to obtain the maximum ice jump height of the model. And taking out the tension sensors at different positions, and analyzing the maximum impact force of the lead on the fixed bracket and the maximum unbalanced tension near the traction bracket in the deicing impact process.
And reversely pushing the obtained model data to the original line according to the geometric similarity ratio and the tension ratio so as to judge the insulation gap and the unbalanced tension of the wire, the impact coefficient of the wire and the like in the deicing mode. Thereby guiding the design of the transmission line.
Step 60: by repeating the steps, the conditions of the maximum ice jump height and the unbalanced tension of the wire under different parameters and different working conditions can be obtained, and the strength problems of the wire insulation gap and the wire and the tower under different parameter conditions are analyzed accordingly.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. A test system suitable for multi-gear transmission conductor deicing fault research is characterized by comprising:
the wire scaling module comprises a long rope, fixing supports for fixing two ends of the long rope and a traction support for suspending the long rope between the fixing supports, wherein at least one traction support divides the long rope into at least two sections, and the long rope at least comprises an ice coating section on which a plurality of ice coating weights are suspended;
the deicing control module comprises a relay and an electromagnet, the electromagnet is fixed on the long rope, the ice-coated heavy object is hung below the electromagnet, and the relay is connected with the electromagnet and controls the current of the electromagnet so as to control the adsorption or the shedding of the ice-coated heavy object;
the tension measuring module comprises tension sensors and dynamic strain gauges, the tension sensors are connected to the ends of the long ropes at different sections, and the tension sensors measure tension change data of the long ropes and transmit the tension change data to the dynamic strain gauges;
the monocular camera module comprises a high-speed camera, a calibration plate and a marker, wherein the marker is fixed on the long rope and used for setting a DIC (digital computer) marker point, the calibration plate calibrates the camera, and the camera shoots and records displacement data of the marker;
and the calculation processing module comprises a processor connected with the camera and the dynamic strain gauge, the processor receives the displacement data recorded by the camera and calculates the maximum ice jump height of the long rope, and the processor receives the tension change data output by the dynamic strain gauge and calculates the maximum impact force of the long rope on the fixed support and the maximum unbalanced tension on the traction support.
2. The testing system suitable for the multi-gear transmission conductor deicing fault study according to claim 1, wherein the traction bracket has two and divides the long rope into three sections, respectively including an ice-coated section located in the middle and non-ice-coated sections located on both sides of the ice-coated section.
3. The testing system suitable for the multi-gear transmission conductor deicing fault study according to claim 1, wherein the long rope is a steel wire rope with a diameter of less than 1 cm.
4. The test system suitable for the multi-gear transmission conductor deicing fault research according to claim 1, wherein a plurality of balancing weights are further fixed on the long rope at intervals.
5. The test system suitable for multi-gear transmission conductor deicing fault research according to claim 4, wherein the weights are the same in weight.
6. The test system suitable for multi-gear transmission conductor deicing fault research according to claim 5, wherein the balancing weight is a stainless steel hollow circular tube, and the stainless steel hollow circular tube is sleeved on the long rope.
7. The test system suitable for the multi-gear transmission conductor deicing fault research according to claim 1, wherein two ends of the long rope are hung on the fixing support through turnbuckles.
8. The test system suitable for the multi-gear transmission conductor deicing fault study according to claim 1, wherein the long rope is suspended on the traction bracket through a hoisting ring.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964822A (en) * | 2020-08-05 | 2020-11-20 | 浙江大学 | Measuring device and system for multi-angle freezing stress of transmission conductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964822A (en) * | 2020-08-05 | 2020-11-20 | 浙江大学 | Measuring device and system for multi-angle freezing stress of transmission conductor |
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