CN213875984U - Frequency response test platform under simulation transformer winding interturn short circuit - Google Patents
Frequency response test platform under simulation transformer winding interturn short circuit Download PDFInfo
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- CN213875984U CN213875984U CN202022101400.5U CN202022101400U CN213875984U CN 213875984 U CN213875984 U CN 213875984U CN 202022101400 U CN202022101400 U CN 202022101400U CN 213875984 U CN213875984 U CN 213875984U
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Abstract
The utility model relates to a frequency response test platform under simulation transformer winding interturn short circuit belongs to transformer fault simulation technical field. This test platform includes: the transformer comprises a transformer winding, an iron core, a frequency response tester and a turn-to-turn short circuit fault simulation device; the transformer winding is wound outside the iron core, and round holes are arranged above the turns in an insulating mode; the frequency response tester is respectively connected with the top end and the bottom end of the transformer winding through wires; the turn-to-turn short circuit fault simulation device comprises a supporting slide rail, an electric gear transmission device, a roller, a conveying belt, a turn-to-turn short circuit switch, a supporting sleeve rod, a device base, a PLC (programmable logic controller) and a supporting guide rod. The utility model discloses can simulate the frequency response's of winding change under the different turn-to-turn short circuit trouble effectively, can regard as research use and for the engineering actual reference that provides, easily popularize and apply.
Description
Technical Field
The utility model belongs to the technical field of transformer fault simulation, concretely relates to frequency response test platform under simulation transformer winding interturn short circuit.
Background
The transformer is used as one of core devices in an electric power system and a traction power supply system, the stability and the reliability of the transformer are related to the normal operation of the whole system, and along with the increase of power consumption, a transformer fault diagnosis technology capable of timely finding hidden dangers is more and more important. When the short-circuit fault occurs in the transformer, the winding generates a large electromagnetic force under the action of short-circuit current and an internal magnetic field, so that the winding is deformed to a certain extent. The turn-to-turn insulation and the pancake insulation are destroyed firstly in the deformation process, so that permanent turn-to-turn short circuit or pancake short circuit is easily caused. Once turn-to-turn short circuit occurs, not only partial discharge can be generated, but also circulation current can be formed between turns of the winding, so that circulation current loss of the transformer winding is increased, even main insulation is broken down, and the transformer is burnt. Therefore, the accurate and timely discovery of the turn-to-turn short circuit fault of the transformer winding has great significance for the safe and reliable operation of the power system.
Currently, the frequency response method is the most widely used method for detecting the fault of the transformer winding, and in the existing research, a joint is usually led out from each turn of the transformer winding, and the frequency response is measured on the basis of the joint, so that the frequency response characteristic of the short-circuit fault is obtained. In order to be able to better judge the frequency response characteristics of different kinds of turn-to-turn short circuit faults, a new turn-to-turn short circuit fault simulation device which is closer to the actual state is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving prior art's not enough, provide a frequency response test platform under simulation transformer winding interturn short circuit to explore transformer winding in the situation of change under the interturn short circuit fault that takes place the difference, it has characteristics such as convenient operation, accuracy height, can obtain interturn short circuit fault and winding frequency response curve's change relation effectively, thereby provides the reference for actual engineering.
In order to achieve the above object, the utility model adopts the following technical scheme:
a frequency response test platform for simulating transformer winding turn-to-turn short circuit comprises: the transformer comprises a transformer winding, an iron core, a frequency response tester and a turn-to-turn short circuit fault simulation device;
the transformer winding is wound outside the iron core, and the upper part of each turn is provided with an opening in an insulating way;
the frequency response tester is respectively connected with the top end and the bottom end of the transformer winding through wires;
a turn-to-turn short circuit fault simulation device is arranged beside the transformer winding;
the turn-to-turn short circuit fault simulation device comprises a support slide rail, an electric gear transmission device, a roller, a conveyor belt, a turn-to-turn short circuit switch, a support sleeve rod, a device base, a PLC (programmable logic controller) and a support guide rod;
two vertical support loop bars are symmetrically fixed on the device base; the fixed seat of the roller is fixed at the top ends of the two support loop bars; the conveying belt is of an annular structure and sequentially surrounds one of the support loop bars, the rollers and the other support loop bar in sequence;
the supporting slide rail and the supporting guide rod are horizontally arranged in parallel up and down; the fixed ends of the supporting slide rail and the supporting guide rod are sleeved on the conveyor belt, and the height of the supporting slide rail is lower than that of an oil duct between transformer winding cakes;
the base of the electric gear transmission device is fixed on the support guide rod, and the power output end of the electric gear transmission device is connected with the free section of the support slide rail, so that the free section of the support slide rail moves left and right;
the turn-to-turn short circuit switches are 1 or more and are all arranged in the free section of the supporting slide rail;
the PLC controller is connected with the electric gear transmission device, the roller and the turn-to-turn short circuit switch and used for controlling the work of the electric gear transmission device, so that the electric gear transmission device drives the free section of the supporting slide rail to move left and right, the control roller rotates to drive the conveying belt to rotate, and the PLC controller is also used for controlling the on-off and the position of the turn-to-turn short circuit switch.
Further, it is preferable to provide circular openings with a diameter of millimeters above the turns.
Further, it is preferable that the PLC controller is fixed to one of the support rods.
Further, it is preferable that the support slide rail has a groove structure, and the turn-to-turn short circuit switch is disposed in a free-section groove of the support slide rail.
Further, it is preferable that distance scales are marked in the groove for supporting the slide rail, so that the short-circuit position can be accurately checked.
Further, it is preferable that the test device further comprises a computer, and the computer is connected with the frequency response tester and is used for receiving the test result of the frequency response tester.
Further, preferably, the turn-to-turn short circuit switch comprises a transmission shaft wheel, a gear chassis, an electric turbine, a rack, a conductor bar and a short circuit contact; the gear chassis is arranged on the supporting slide rail; the gear chassis is meshed with the electric turbine; the electric turbine is coaxially and fixedly connected with the transmission shaft wheel; the wheel of the transmission shaft is meshed with the rack; one end of the rack is fixedly connected with the middle part of the conductor bar; one side of the conductor bar, which is far away from the rack, is fixedly connected with two symmetrically-arranged short-circuit contacts;
the PLC controller is connected with the electric turbine and used for controlling the electric turbine to drive the transmission shaft wheel to rotate so as to drive the rack to move, the axial direction of the conductor bar is converted into a horizontal state from a vertical state, and then the short-circuit contact is inserted into the open hole in the transformer winding.
A frequency response test method under the condition of simulating turn-to-turn short circuit of a transformer winding adopts the frequency response test platform under the condition of simulating the turn-to-turn short circuit of the transformer winding, and comprises the following steps:
s1: connecting a frequency response tester to the top end and the bottom end of the transformer winding through leads;
s2: according to the requirements of fault simulation experiments, the PLC controls the rollers to lift the supporting slide rail through the conveyor belt and move to the required position;
s3: selecting a turn-to-turn short circuit switch to be controlled according to the requirements of a fault simulation experiment; the PLC controller controls the electric gear transmission device to enable the free section provided with the turn-to-turn short circuit switch supporting slide rail to move to a required position;
s4: controlling turn-to-turn short circuit switches to be switched on and off through a PLC (programmable logic controller), simulating turn-to-turn short circuit faults, and simultaneously obtaining a transformer winding frequency response curve under the turn-to-turn short circuit faults by using a frequency response tester;
s5: and repeating S2-S4, thereby obtaining frequency response data of turn-to-turn short circuit faults of different short circuit turns under the same cake winding and the same short circuit turn under multiple cakes.
As will be appreciated by those skilled in the art, after the platform is installed, the free section of the supporting slide rail faces the winding, and the extension length of the free section can meet the requirement of testing when the turn-to-turn short circuit switch is in short circuit.
Compared with the prior art, the utility model, its beneficial effect does:
the utility model discloses frequency response test platform novel structure can simulate the change of the frequency response of winding under the different turn-to-turn short circuit trouble effectively, has characteristics such as convenient operation, accuracy height, can regard as research use and for the engineering actual provision reference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a frequency response test platform for simulating a transformer winding turn-to-turn short circuit according to the present invention;
fig. 2 is a schematic structural diagram of the turn-to-turn short circuit switch of the present invention;
1. a transformer winding; 2. supporting the slide rail; 3. an electric gear transmission; 4. a roller; 5. a conveyor belt; 6 turn-to-turn short-circuit switches; 7. an iron core; 8. supporting the loop bar; 9. a device base; 10. a PLC controller; 11. a frequency response tester; 12. a computer; 13. an insulating layer; 14. a wire; 15. a support guide rod; 601. a drive shaft wheel; 602. a gear chassis; 603. an electric turbine; 604. a rack; 605. a conductor bar; 606. and short-circuiting the contacts.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
It can be understood by those skilled in the art that the related modules and the functions implemented by the related modules in the present invention are implemented by loading conventional computer software programs or related protocols on the modified hardware and the devices, devices or systems formed by the hardware, devices or systems, and are not modified computer software programs or related protocols in the prior art. For example, the improved computer hardware system can still realize the specific functions of the hardware system by loading the existing software operating system. Therefore, it can be understood that the innovation of the present invention lies in the improvement of the hardware module and the connection combination relationship thereof in the prior art, rather than the improvement of the software or protocol installed in the hardware module for realizing the related functions.
As will be understood by those skilled in the art, the relevant modules mentioned in the present disclosure are hardware devices for performing one or more of the operations, methods, steps, measures, solutions described in the present application. The hardware devices may be specially designed and constructed for the required purposes, or they may be of the kind well known in the general purpose computers or other hardware devices known. The general purpose computer has a program stored therein that is selectively activated or reconfigured.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, "connected" as used herein may include wirelessly connected. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings, which is for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "provided" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention is understood according to the specific situation.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in fig. 1-2, a frequency response test platform for simulating a transformer winding under a turn-to-turn short circuit includes: the transformer comprises a transformer winding 1, an iron core 7, a frequency response tester 11 and an inter-turn short circuit fault simulation device;
the transformer winding 1 is wound outside the iron core 7, and a circular opening is arranged above each turn in an insulating mode;
the frequency response tester 11 is respectively connected with the top end and the bottom end of the transformer winding 1 through leads 14;
a turn-to-turn short circuit fault simulation device is arranged beside the transformer winding 1;
the turn-to-turn short circuit fault simulation device comprises a support slide rail 2, an electric gear transmission device 3, a roller 4, a conveyor belt 5, a turn-to-turn short circuit switch 6, a support loop bar 8, a device base 9, a PLC (programmable logic controller) 10 and a support guide rod 15;
two vertical supporting sleeve rods 8 are symmetrically fixed on the device base 9; the fixed seat of the roller 4 is fixed at the top ends of the two support loop bars 8; the conveyor belt 5 is of an annular structure and sequentially surrounds one of the support loop bars 8, the roller 4 and the other support loop bar 8 in sequence; the support sleeve rod 8 plays a role of supporting the conveyor belt 5;
the supporting slide rail 2 and the supporting guide rod 15 are horizontally arranged in parallel up and down; the fixed ends of the supporting slide rail 2 and the supporting guide rod 15 are sleeved on the conveyor belt 5, and the height of the supporting slide rail 2 is lower than that of an oil duct between the transformer winding 1 cakes;
the base of the electric gear transmission device 3 is fixed on the support guide rod 15, and the power output end of the electric gear transmission device 3 is connected with the free section of the support slide rail 2, so that the free section of the support slide rail 2 moves left and right;
the turn-to-turn short circuit switches 6 are 1 or more and are all arranged in the free section of the supporting slide rail 2; as shown in fig. 1, there are 3 turn-to-turn short-circuit switches 6;
the PLC 10 is connected with the electric gear transmission device 3, the roller 4 and the turn-to-turn short circuit switch 6 and used for controlling the work of the electric gear transmission device 3, so that the free section of the supporting slide rail 2 is driven to move left and right through the electric gear transmission device 3, the conveying belt 5 is driven to rotate through the rotation of the control roller 4, and the on-off and the position of the turn-to-turn short circuit switch 6 are also controlled. Preferably, when the free section of the support slide rail 2 is completely retracted, the support slide rail 2 can move up and down;
preferably, a circular opening with a diameter of 2 mm is provided insulated above each turn.
Preferably, the PLC controller 10 is fixed to one of the support rods 8.
Preferably, the supporting slide rail 2 is of a groove-type structure, and the turn-to-turn short circuit switch 6 is arranged in a free-section groove of the supporting slide rail 2.
Preferably, distance scales are marked in the groove of the supporting slide rail 2, so that the short circuit position can be accurately checked.
Preferably, the device further comprises a computer 12, wherein the computer 12 is connected to the frequency response tester 11 and is used for receiving the test result of the frequency response tester 11.
Preferably, the short-circuit contact 606 is made of copper, and the transmission shaft wheel 601, the electric turbine 603 and the rack 604 are made of steel coated with a layer of insulating paint.
Preferably, the turn-to-turn short circuit switch 6 comprises a transmission shaft wheel 601, a gear chassis 602, an electric turbine 603, a rack 640, a conductor bar 605 and a short circuit contact 606; the gear chassis 602 is mounted on the support slide rail 2; the gear chassis 602 meshes with the electric turbine 603; the electric turbine 603 is coaxially and fixedly connected with the transmission shaft wheel 610; the transmission shaft wheel 601 is meshed with the rack 604; one end of the rack 604 is fixedly connected with the middle part of the conductor bar 605; one side of the conductor bar 605 far away from the rack 604 is fixedly connected with two symmetrically arranged short-circuit contacts 606;
the PLC controller 10 is connected to the electric turbine 603, and is configured to control the electric turbine 603 to drive the transmission shaft wheel 601 to rotate, so as to drive the rack 604 to move, so that the axial direction of the conductor bar 605 is converted from a vertical state to a horizontal state, and then the short-circuit contact 606 is inserted into the opening on the transformer winding 1.
When the conductor bar 605 enters the space between the two blocks, it is in the vertical state, and when it reaches the turn to be short-circuited, it is rotated to the horizontal state, that is, the short-circuit contact 606 is lowered from the three o 'clock position to the 6 o' clock position, and inserted into the opening (formed in the closed state) on the transformer winding 1, thereby completing the analog short-circuit. After the test is completed, the PLC controller 41 controls the electric turbine 603 to drive the transmission shaft wheel 601 to rotate, so as to drive the rack 604 to move, so that the axial direction of the conductor bar 605 is converted from a horizontal state to a vertical state, and the short-circuit contact 606 leaves from the opening on the transformer winding 1, thereby recovering the normal condition.
A frequency response test method under the condition of simulating turn-to-turn short circuit of a transformer winding adopts the frequency response test platform under the condition of simulating the turn-to-turn short circuit of the transformer winding, and comprises the following steps:
s1: connecting a frequency response tester to the top end and the bottom end of the transformer winding through leads;
s2: according to the requirements of fault simulation experiments, the PLC controls the rollers to lift the supporting slide rail through the conveyor belt and move to the required position;
s3: selecting a turn-to-turn short circuit switch to be controlled according to the requirements of a fault simulation experiment; the PLC controller controls the electric gear transmission device to enable the free section provided with the turn-to-turn short circuit switch supporting slide rail to move to a required position;
s4: controlling turn-to-turn short circuit switches to be switched on and off through a PLC (programmable logic controller), simulating turn-to-turn short circuit faults, and simultaneously obtaining a transformer winding frequency response curve under the turn-to-turn short circuit faults by using a frequency response tester;
s5: and repeating S2-S4, thereby obtaining frequency response data of turn-to-turn short circuit faults of different short circuit turns under the same cake winding and the same short circuit turn under multiple cakes.
Preferably, the frequency response tester adopts a sweep frequency response analyzer FRAX-101 of Megger company, the test voltage is 10V, the measurement frequency range is 1 kHz-1 MHz, and the off-line power supply time of the battery is as long as 10 hours. The PLC controller adopts Mitsubishi FX3U-48MT/ES-A, and the CPU processing speed reaches 0.065 us/basic instruction; a high-capacity RAM memory with 64K steps is built in; control up to 384 points can be achieved through the expansion of the CC-Link network.
The utility model discloses to prior art exist not enough, provide a frequency response test platform under simulation transformer winding interturn short circuit to explore transformer winding frequency response curve's the situation of change when different grade type interturn short circuit trouble, it has convenient operation, does not have characteristics such as wiring interference, can study interturn short circuit trouble and winding frequency response curve's variation relation effectively, thereby provide the reference for actual engineering.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A frequency response test platform under simulation transformer winding turn-to-turn short circuit, its characterized in that includes: the transformer comprises a transformer winding (1), an iron core (7), a frequency response tester (11) and an inter-turn short circuit fault simulation device;
the transformer winding (1) is wound outside the iron core (7), and the upper part of each turn is provided with an opening in an insulating way;
the frequency response tester (11) is respectively connected with the top end and the bottom end of the transformer winding (1) through leads (14);
a turn-to-turn short circuit fault simulation device is arranged beside the transformer winding (1);
the turn-to-turn short circuit fault simulation device comprises a supporting slide rail (2), an electric gear transmission device (3), a roller (4), a conveying belt (5), a turn-to-turn short circuit switch (6), a supporting sleeve rod (8), a device base (9), a PLC (programmable logic controller) controller (10) and a supporting guide rod (15);
two vertical support sleeve rods (8) are symmetrically fixed on the device base (9); the fixed seat of the roller (4) is fixed at the top ends of the two support loop bars (8); the conveyor belt (5) is of an annular structure and sequentially surrounds one of the support loop bars (8), the roller (4) and the other support loop bar (8);
the supporting slide rail (2) and the supporting guide rod (15) are horizontally arranged in parallel up and down; the fixed ends of the supporting slide rail (2) and the supporting guide rod (15) are sleeved on the conveyor belt (5), and the height of the supporting slide rail (2) is lower than that of an oil duct between transformer winding (1) cakes;
the base of the electric gear transmission device (3) is fixed on the support guide rod (15), and the power output end of the electric gear transmission device (3) is connected with the free section of the support slide rail (2), so that the free section of the support slide rail (2) moves left and right;
the turn-to-turn short circuit switches (6) are arranged in the free sections of the supporting slide rails (2) and are at least 1;
the PLC (10) is connected with the electric gear transmission device (3), the roller (4) and the turn-to-turn short circuit switch (6).
2. The frequency response test platform for simulating transformer winding turn-to-turn short circuit according to claim 1, wherein a circular opening with a diameter of 2 mm is arranged on each turn in an insulating manner.
3. The frequency response test platform for simulating transformer winding turn-to-turn short circuit according to claim 1, characterized in that the PLC controller (10) is fixed on one of the support rods (8).
4. The frequency response test platform for simulating the turn-to-turn short circuit of the transformer winding according to claim 1, wherein the supporting slide rail (2) is of a groove-type structure, and the turn-to-turn short circuit switch (6) is arranged in a free-section groove of the supporting slide rail (2).
5. The test platform for simulating the frequency response of the transformer under the condition of the turn-to-turn short circuit is characterized in that distance scales are marked in grooves of the supporting slide rails (2).
6. The frequency response test platform for simulating the transformer winding turn-to-turn short circuit according to claim 1, further comprising a computer (12), wherein the computer (12) is connected to the frequency response tester (11) and is configured to receive the test result of the frequency response tester (11).
7. The frequency response test platform for simulating the transformer winding under the condition of turn-to-turn short circuit according to claim 1, wherein the turn-to-turn short circuit switch (6) comprises a transmission shaft wheel (601), a gear chassis (602), an electric turbine (603), a rack (604), a conductor bar (605) and a short circuit contact (606); the gear chassis (602) is arranged on the support slide rail (2); the gear chassis (602) is meshed with the electric turbine (603); the electric turbine (603) is coaxially and fixedly connected with the transmission shaft wheel (601); the transmission shaft wheel (601) is meshed with the rack (604); one end of the rack (604) is fixedly connected with the middle part of the conductor bar (605); one side of the conductor bar (605) far away from the rack (604) is fixedly connected with two symmetrically arranged short-circuit contacts (606);
the PLC controller (10) is connected with the electric turbine (603).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022101400.5U CN213875984U (en) | 2020-09-22 | 2020-09-22 | Frequency response test platform under simulation transformer winding interturn short circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022101400.5U CN213875984U (en) | 2020-09-22 | 2020-09-22 | Frequency response test platform under simulation transformer winding interturn short circuit |
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| CN213875984U true CN213875984U (en) | 2021-08-03 |
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| CN202022101400.5U Active CN213875984U (en) | 2020-09-22 | 2020-09-22 | Frequency response test platform under simulation transformer winding interturn short circuit |
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