CN210181159U - Device for improving capacity of series-excited boosting test transformer - Google Patents
Device for improving capacity of series-excited boosting test transformer Download PDFInfo
- Publication number
- CN210181159U CN210181159U CN201920984608.0U CN201920984608U CN210181159U CN 210181159 U CN210181159 U CN 210181159U CN 201920984608 U CN201920984608 U CN 201920984608U CN 210181159 U CN210181159 U CN 210181159U
- Authority
- CN
- China
- Prior art keywords
- transformer
- test
- tap
- series
- capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The utility model discloses an improve device of series excited step-up test transformer capacity, including the experimental transformer T1 and the experimental transformer T2 that concatenate, experimental transformer T1 is connected to the power control box, the power control box is connected to the power, experimental transformer T2 is connected to by test article Cx, the output high pressure of experimental transformer T1 is taken a1 and the high pressure is taken a percentage x1 and is connected to the input of experimental transformer T2 respectively and is taken a2 and take a percentage x2, take a percentage a2 and take a percentage x2 and be connected with low pressure side middle section parallel compensation reactor within a definite time. The utility model discloses a connected mode of middle section equipotential inductance compensation replaces the parallelly connected inductance of high-pressure side to carry out the method of compensating, adopts middle section equipotential inductance compensation back, can make inductance winding rated voltage greatly reduced, volume reduce greatly, and the preparation and carrying of being convenient for adopt middle section equipotential inductance compensation, can make the test capacity of original series excitation formula step up test transformer promote one time.
Description
Technical Field
The utility model belongs to the technical field of the test equipment of step-up test transformer, a improve device of series excited step-up test transformer capacity is related to.
Background
When the power equipment is in operation, the insulation of the power equipment is gradually degraded and defects are formed under the action of an electric field, temperature and mechanical vibration for a long time. In order to effectively detect insulation defects of an electric power device (hereinafter referred to as a test object) in operation and examine the capability of the electric power device to withstand various overvoltage, a step-up test transformer is required to perform a power frequency alternating current withstand voltage test on the test object (fig. 1). Has important significance for ensuring the safe operation of the equipment.
In the case of performing a commercial ac withstand voltage test, if the voltage of the sample to be tested is high and the capacity is large, the voltage of the necessary step-up test transformer is also high and the capacity is large. The booster test transformer is heavy in size and inconvenient to install and carry. In order to reduce the volume and mass of a single step-up test transformer and facilitate the manufacture, installation, transportation and carrying, a common method is to manufacture two or three step-up test transformers with smaller volume and mass, and then form a series step-up test transformer (fig. 2) so as to obtain the required test voltage.
At present, when a series-excited boost test transformer is used for an alternating-current withstand voltage test, a test circuit and test equipment have stray capacitance to the ground, so that the test current Icx is increased, and although the rated voltage of the series-excited boost test transformer can meet the requirement of the test voltage, the rated current of the boost test transformer sometimes cannot reach the test current required by a tested product. In addition, when a large-capacitance tested object is tested, the capacity of the boosting test transformer is obviously insufficient. In order to solve the above problem, a method of connecting a high-voltage compensation reactor in parallel on the high-voltage side is currently adopted, in which the high-voltage parallel compensation reactor is connected in parallel with a test object Cx (fig. 3), and the inductive current flowing through the high-voltage parallel compensation reactor is used to compensate the capacitive current flowing through the test object, so that the inductive current flowing through the high-voltage compensation reactor is compensated with the capacitive current flowing through the test object, thereby reducing the current flowing through the high-voltage winding of the step-up test transformer, and reducing the capacity of the step-up test transformer, so as to solve the problem of insufficient capacity. However, the high-voltage parallel compensation reactor is adopted, so that the rated voltage of the reactor is high, the manufacturing cost is high, and the reactor is heavy in size and brings inconvenience to the test work.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the utility model provides a improve device of series excitation boost test transformer capacity to solve the problem that exists among the prior art.
The utility model discloses the technical scheme who takes does: a device for improving the capacity of a series-excited boosting test transformer comprises a test transformer T1 and a test transformer T2 which are connected in series, wherein the test transformer T1 is connected to a power supply control box, the power supply control box is connected to a power supply, the test transformer T2 is connected to a tested object Cx, an output high-voltage tap a1 and a high-voltage tap x1 of the test transformer T1 are respectively connected to an input tap a2 and a tap x2 of the test transformer T2, and a low-voltage side middle-section parallel compensation reactor is connected between the tap a2 and the tap x 2.
Preferably, the low-voltage side middle section parallel compensation reactor is placed on a box cover of the test transformer T2.
Preferably, above-mentioned low pressure side middle section parallel compensation reactor includes column iron core, enameled copper line and epoxy board, and the enameled copper winding is on column iron core, column iron core both ends fixedly connected with epoxy board, a plurality of terminals of fixedly connected with on the epoxy board, and a plurality of terminals are connected to a plurality of taps of wound enameled copper line respectively.
Preferably, the columnar iron core is formed by stacking silicon steel sheets with the length of 20cm, the width of 6cm and the thickness of 0.3mm to form a section of 36cm2A large columnar iron core structure.
Preferably, the enameled copper wire is 4mm2And winding the wire by 300 turns, drawing a tap from the 100 th turn, and drawing a tap after winding every 25 turns, wherein the number of the taps is 7-9.
The utility model has the advantages that: compared with the prior art, the utility model discloses an effect as follows:
(1) the utility model adopts the connection mode of middle section equipotential inductance compensation to replace a method for compensating high-voltage side parallel inductance, after the middle section equipotential inductance compensation is adopted, the rated voltage of an inductance winding can be greatly reduced, the volume is greatly reduced, the manufacture and the carrying are convenient, and the test capacity of the original series excitation type boosting test transformer can be doubled by adopting the middle section equipotential inductance compensation;
(2) the middle section equipotential inductance is the tap formula to adjust the number of turns and change the inductance parameter during the use, satisfy the requirement of different test conditions.
Drawings
FIG. 1 is a schematic wiring diagram of a power frequency AC withstand voltage test performed by a single step-up test transformer;
FIG. 2 is a schematic wiring diagram of a series excitation type power frequency AC withstand voltage test performed by two step-up test transformers;
FIG. 3 is a schematic wiring diagram of a power frequency AC withstand voltage test performed by connecting a high-voltage compensation reactor and a tested object in parallel;
FIG. 4 is a schematic wiring diagram of a power frequency AC withstand voltage test using middle-section equipotential inductance compensation;
FIG. 5 is a schematic view of a columnar iron core structure;
FIG. 6 is a schematic diagram of a structure of a columnar iron core connected with an epoxy resin plate;
FIG. 7 is a schematic diagram of a low-voltage side middle section parallel compensation reactor structure.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 4-7, an apparatus for increasing the capacity of a series-excited step-up test transformer includes a test transformer T1 and a test transformer T2 connected in series, the test transformer T1 is connected to a power control box, the power control box is connected to a power supply, the test transformer T2 is connected to a tested object Cx, an output high-voltage tap a1 and a high-voltage tap x1 of the test transformer T1 are respectively connected to an input tap a2 and a tap x2 of the test transformer T2, and a low-voltage side middle-section parallel compensation reactor is connected between the tap a2 and the tap x 2.
Preferably, the low-voltage side middle section parallel compensation reactor is placed on a box cover of the test transformer T2.
Preferably, above-mentioned low pressure side middle section parallel compensation reactor includes column iron core, enameled copper line and epoxy board, and the enameled copper winding is on column iron core, column iron core both ends fixedly connected with epoxy board, a plurality of terminals of fixedly connected with on the epoxy board, and a plurality of terminals are connected to a plurality of taps of wound enameled copper line respectively.
Preferably, the columnar iron core is formed by stacking silicon steel sheets with the length of 20cm, the width of 6cm and the thickness of 0.3mm to form a section of 36cm2A large columnar iron core structure.
Preferably, the enameled copper wire is 4mm2And winding the wire by 300 turns, drawing a tap from the 100 th turn, and drawing a tap after winding every 25 turns, wherein the number of the taps is 7-9.
Preferably, the preparation method of the low-voltage side middle section parallel compensation reactor comprises the following steps:
(1) silicon steel sheets with the length of 20cm, the side length width of 6cm and the thickness of 0.3mm are stacked into a silicon steel sheet with the cross section of 36cm2A large columnar iron core;
(2) fixing epoxy resin plates on the upper end face and the lower end face of the columnar iron core by using adhesives respectively;
(3) by 4mm2The enameled copper wire is wound on the cylindrical iron core to form a 300-turn winding, a tap is drawn out from the 100 th turn in the winding process, a tap is drawn out after 25 turns are wound, 7-9 taps are drawn out, the 7-9 taps are drawn out, and the wire ends of the 7-9 taps are fixed to the wiring terminals on the epoxy resin plate on the upper end face of the cylindrical iron core so that the number of turns can be selected according to needs during use. And winding of the low-voltage side middle section parallel compensation reactor is wound by an insulating glass ribbon and is subjected to dip coating treatment.
When the low-voltage side middle-section parallel compensation reactor is used, the low-voltage side middle-section parallel compensation reactor is connected to the terminals of a tap a2 and a tap x2 of a test transformer T2 in a wiring diagram shown in fig. 4 (the equipotential inductance of the middle section in the diagram is L), the low-voltage side middle-section parallel compensation reactor is placed on a box cover of the test transformer T2, attention is paid to a high-voltage lead-out wire sleeve which is far away from T2 as far as possible, and discharging of the high-voltage lead-out wire terminal a3 to. When the power frequency withstand voltage of the tested Cx is carried out, an inductive current flows through the low-voltage side middle section parallel compensation reactor, the current flowing through the high-voltage taps a1 and x1 of the test transformer T1 is compensated, and the current I on the power supply sidelAnd the number of the test pieces is reduced, so that the test pieces with larger capacity can be tested when the series AC voltage withstand test is used.
The utility model provides a pair of improve device of series excited step up test transformer capacity when improving series excited step up test transformer capacity, can also lighten weight, reduce cost improves the operation efficiency to alleviate operation intensity of labour.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention, therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (5)
1. The utility model provides an improve device of series excitation formula step-up test transformer capacity which characterized in that: the testing transformer T1 and the testing transformer T2 are connected in series, the testing transformer T1 is connected to a power supply control box, the power supply control box is connected to a power supply, the testing transformer T2 is connected to a tested object Cx, an output high-voltage tap a1 and a high-voltage tap x1 of the testing transformer T1 are respectively connected to an input tap a2 and a tap x2 of the testing transformer T2, and a low-voltage side middle section parallel compensation reactor is connected between the tap a2 and the tap x 2.
2. The device for improving the capacity of the series-wound step-up test transformer according to claim 1, is characterized in that: and the low-voltage side middle section parallel compensation reactor is placed on a box cover of the test transformer T2.
3. The device for improving the capacity of the series-wound step-up test transformer according to claim 1, is characterized in that: low pressure side middle section parallel compensation reactor includes column iron core, enameled copper line and epoxy board, and the enameled copper line winding is on column iron core, column iron core both ends fixedly connected with epoxy board, a plurality of terminals of fixedly connected with on the epoxy board, and a plurality of terminals are connected to a plurality of taps of winding enameled copper line respectively.
4. The device for improving the capacity of the series-wound step-up test transformer according to claim 3, is characterized in that: the columnar iron core is formed by stacking silicon steel sheets with the length of 20cm, the width of 6cm and the thickness of 0.3mm into a section of 36cm2A large columnar iron core structure.
5. The device for improving the capacity of the series-wound step-up test transformer according to claim 3, is characterized in that: the enameled copper wire is 4mm2And winding the wire by 300 turns, drawing a tap from the 100 th turn, and drawing a tap after winding every 25 turns, wherein the number of the taps is 7-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920984608.0U CN210181159U (en) | 2019-06-27 | 2019-06-27 | Device for improving capacity of series-excited boosting test transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920984608.0U CN210181159U (en) | 2019-06-27 | 2019-06-27 | Device for improving capacity of series-excited boosting test transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210181159U true CN210181159U (en) | 2020-03-24 |
Family
ID=69839169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920984608.0U Active CN210181159U (en) | 2019-06-27 | 2019-06-27 | Device for improving capacity of series-excited boosting test transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210181159U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174598A (en) * | 2019-06-27 | 2019-08-27 | 贵州电网有限责任公司 | A kind of device improving series excitation type pressure build-up test transformer capacity |
-
2019
- 2019-06-27 CN CN201920984608.0U patent/CN210181159U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174598A (en) * | 2019-06-27 | 2019-08-27 | 贵州电网有限责任公司 | A kind of device improving series excitation type pressure build-up test transformer capacity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101294985B (en) | Power supply device for controllable reactor induction voltage-resistant experiment and its partial discharging measurement method | |
| CN102175956B (en) | Long duration induction voltage withstand test device of ultrahigh-voltage transformer | |
| CN201203633Y (en) | Power supply device for controllable inductor induction voltage-resistant experiment | |
| CN104035013A (en) | 500 KV electromagnetic voltage transformer alternating-current frequency-doubling withstand voltage test circuit and method | |
| CN206038836U (en) | Series resonance high -voltage insulation test device | |
| CN105044408A (en) | High-current current boosting device for ultrahigh-voltage current transformer calibration | |
| CN109521338A (en) | Frequency conversion parallel resonance pressure resistant test method based on Cascade boosting | |
| CN113258687B (en) | Bilateral LC compensation type CPT system and parameter design method thereof | |
| CN104198900A (en) | Testing device for long term voltage induction and partial discharge measurement test | |
| CN210181159U (en) | Device for improving capacity of series-excited boosting test transformer | |
| CN101599353B (en) | Integrated filter inductance transformer | |
| CN101257213A (en) | Reactive-load compensation method for high capacity high electric impedance distributing transformator attrition experiment | |
| CN103543305A (en) | Weak damping alternating-current high-voltage generator for partial discharge detection of power equipment | |
| CN201955438U (en) | Ultra high voltage transformer long-time induced over voltage withstand test device | |
| CN203759189U (en) | Ultra-large-capacity high-voltage variable frequency resonant cable voltage withstanding test device | |
| CN202758041U (en) | Intelligent cable voltage withstand system | |
| CN110890201B (en) | Three-phase shunt reactor lead wire connection structure | |
| CN107436399A (en) | High altitude localities 750kV shunt reactor local discharge test devices | |
| CN209859774U (en) | Power supply intelligent control type power energy-saving transformer with deep integration | |
| CN210722721U (en) | High-voltage reactor with low noise | |
| CN207503797U (en) | Two-tap intermediate frequency exciting test transformer | |
| CN210692308U (en) | Power capacitor filter reactor | |
| CN103543362A (en) | Selecting method of filters in extra-high voltage transformer no-load test | |
| CN201750348U (en) | Multi-level high-voltage transformer rectifier unit | |
| CN201191311Y (en) | Transient characteristic experiment apparatus of ultra-high-voltage current transducer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |