CN215833516U - Novel loss measuring device for three-phase shunt reactor - Google Patents
Novel loss measuring device for three-phase shunt reactor Download PDFInfo
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- CN215833516U CN215833516U CN202121425234.2U CN202121425234U CN215833516U CN 215833516 U CN215833516 U CN 215833516U CN 202121425234 U CN202121425234 U CN 202121425234U CN 215833516 U CN215833516 U CN 215833516U
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Abstract
The utility model belongs to the field of loss measurement of three-phase shunt reactors, and particularly relates to a novel loss measurement device of a three-phase shunt reactor, which comprises a current transformer, a voltage transformer and a loss measurement instrument; a neutral point X, Y, Z led out from the three-phase winding of the test transformer is connected with a grounding point in series, and a voltage transformer is connected between the high-voltage winding of the tested three-phase reactor and the neutral point in parallel; the current transformer and the voltage transformer are connected with a loss measuring instrument; the neutral point X, Y, Z of the test transformer is a neutral point in a grounding state after the three-phase windings of the three-phase reactor to be tested are correspondingly connected with the high-voltage-side three-phase U, V, W phase windings of the test transformer. The lifting seat structure ensures enough insulation distance outside the three neutral points, and simultaneously, the three neutral point leads can respectively descend along the sleeve, and then the operation of connecting the current transformers in series is directly finished on the ground, so that the single-phase current signal acquisition during loss measurement is facilitated.
Description
Technical Field
The utility model belongs to the field of loss measurement of three-phase shunt reactors, and particularly relates to a novel loss measurement device of a three-phase shunt reactor.
Background
Three-phase shunt reactors are one of the important devices of power systems, and play a role in stabilizing the system voltage. The loss of a shunt reactor is one of the performance parameters of the reactor. The shunt reactor only needs one neutral point in actual operation, but three neutral points need to be led out temporarily in the test process for the purpose of loss measurement, and one neutral point is synthesized after the measurement is finished. In the past, for the purpose of loss measurement, three temporary neutral points are led out from a three-phase shunt reactor in the manufacturing process, after the loss measurement is completed, the three neutral points are combined into one neutral point, and then the projects such as an external withstand voltage test, a lightning impulse voltage test at the neutral point end and the like are continuously carried out. In the loss measuring device of the existing three-phase parallel reactor, a temporary wire outlet device is required to be installed to help lead out three neutral points before a product enters a test hall, insulating oil in the reactor is discharged to the upper edge of the device after a loss test is finished, then the three neutral points are disconnected from a temporary sleeve and then connected in parallel, and then the three neutral points are connected to an original sleeve of the product, and then the subsequent test can be carried out after the product needs to be subjected to the process flows of secondary evacuation, oil injection, static discharge and the like. Besides complex operation and waste of production resources, risk points such as internal wetting of products and control of insulation distance of neutral point lead wires to an oil tank are increased objectively.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a novel loss measuring device for a three-phase shunt reactor, which is used for improving the local structure of the existing three-phase test transformer. The connection mode of the front high-voltage side of the three-phase test transformer is YN, and only one neutral point is led out. In order to realize the loss measurement of the three-phase shunt reactor, a neutral point is led out from each of the three phases of the high-voltage side A, B, C. Therefore, the continuous test of the three-phase shunt reactor is realized, the test period of each three-phase transformer is saved by at least 72h, the test efficiency is greatly improved, the manufacturing period of the whole product is shortened, and the problem of the current test efficiency is solved.
The technical scheme adopted by the utility model for realizing the purpose is as follows:
a new loss measuring device of a three-phase shunt reactor comprises a current transformer, a voltage transformer and a loss measuring instrument;
a neutral point X, Y, Z led out from the three-phase winding of the test transformer is connected with a grounding point in series, and a voltage transformer is connected between the high-voltage winding of the tested three-phase reactor and the neutral point in parallel;
the current transformer and the voltage transformer are connected with a loss measuring instrument;
the neutral point X, Y, Z of the test transformer is a neutral point in a grounding state after the three-phase windings of the three-phase reactor to be tested are respectively and correspondingly connected with the high-voltage side three-phase U, V, W phase windings of the test transformer, and two ends of each phase of branch formed after the three-phase reactor to be tested is connected with the high-voltage side of the test transformer are grounded.
The neutral point X, Y, Z of the test transformer is respectively connected with the grounding wires of the three neutral point sleeves of 1U-N, 1V-N and 1W-N;
each grounding wire is fixed at the root of the corresponding neutral point sleeve, and the rest grounding wires are arranged along the lifting seat and the edge of the oil tank; the distribution of the neutral point sleeves starts from the external leading-out side of the U phase of the high-voltage winding close to the test transformer, 1U-N, 1V-N and 1W-N sleeves are distributed in the clockwise direction, an independent grounding wire is respectively installed on each neutral point sleeve terminal, and finally the 1U-N, 1V-N and 1W-N neutral point sleeves are respectively connected with the neutral point X, Y, Z of the test transformer.
The grounding wires of the three neutral point sleeves of 1U-N, 1V-N and 1W-N are grounded.
The connecting lines of the geometric centers of the projections of the three sleeves on the lifting seat are in an isosceles triangle shape.
The diameter of the lifting seat is changed, so that the neutral point sleeves can be arranged on the lifting seat, and the geometric center of the lifting seat is unchanged.
The utility model has the following beneficial effects and advantages:
1. the utility model greatly improves the test efficiency of the three-phase parallel reactor, and can save 72 hours for a single product.
2. And secondary wire changing and processing processes in the product test process are eliminated, and the production cost is saved. And the quality problem caused by secondary process treatment in the product test process is avoided.
3. The lifting seat structure ensures enough insulation distance outside the three neutral points, and simultaneously, the three neutral point leads can respectively descend along the sleeve, and then the operation of connecting the current transformers in series is directly finished on the ground, so that the single-phase current signal acquisition during loss measurement is facilitated.
Drawings
FIG. 1 is a schematic diagram of a three-branch temporary test sleeve circuit of a current tested three-phase reactor;
FIG. 2 is a schematic circuit diagram of a loss measuring device for a three-phase shunt reactor of the present invention;
FIG. 3 is a schematic diagram of a modification of the test transformer of the present invention;
FIG. 4 is a schematic diagram of a three-phase shunt reactor loss measurement device of the present invention;
wherein, 1 is the U-phase external leading-out side of the high-voltage winding, 2 is a lifting seat, 3 is a 1V-N sleeve, 4 is a 1U-N sleeve, 5 is a 1W-N sleeve, 6 is a current transformer, 7 is a voltage transformer, and 8 is a loss measuring instrument.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, it is a schematic diagram of a three-branch temporary test sleeve circuit of a currently tested three-phase reactor;
at present, a loss measurement loop is shown in the figure, a tested three-phase reactor is arranged in a solid line frame, three neutral points need to be led out, and loss measurement is carried out at the neutral points. The improved trial transformer high-voltage side connection mode is still YN, but three independent sleeves are respectively led out before the final grounding position, namely, the position where the phase current can be measured in a single phase is reserved before Y connection, so that the high-efficiency finished shunt reactor product delivery test is realized.
The solid line boxes represent the tested three-phase shunt reactor, and A, B, C represent three line ends respectively; x, Y, Z, three neutral points are respectively extracted, which are temporary neutral points required to be extracted for loss measurement, and one neutral point is synthesized after the test is finished, because only one neutral point is required when the reactor is actually operated.
The tested reactor does not need to lead out three temporary neutral points, and only one neutral point is adopted. As shown in fig. 2 and 4, the three-phase shunt reactor loss measuring device according to the present invention is a schematic circuit diagram, the solid line frame of the present invention is a three-phase test transformer, which is improved from one neutral point of the existing test transformer to three neutral points, respectively X, Y, Z, and the loss measurement is performed through the neutral point of the test transformer.
During loss measurement, the connection mode is as shown in fig. 2, and the current transformers are sequentially connected in series. Three independent neutral points are respectively led out from the transformer body, the upper part of the oil tank is led out to the root of the sleeve by the aid of an improved lifting seat, loss test conditions are met, and a position drawing is led out of the neutral points after trial transformation is finished.
The three-phase test transformer is locally improved, and three neutral point bushings are led out; a neutral point X, Y, Z led out from the three-phase winding of the test transformer is connected with a grounding point in series, and a voltage transformer is connected between the high-voltage winding of the tested three-phase reactor and the neutral point in parallel; the current transformer and the voltage transformer are connected with a loss measuring instrument;
in this embodiment, X, Y, Z are three neutral points respectively drawn by the test transformer, as shown in fig. 2, taking phase C as an example, and the same is true for the other two items.
A current transformer is connected in series between the neutral point of the trial transformer and the grounding point, and measures the amplitude and the waveform of the current; the signal measured by the current transformer is input to a loss measuring bridge. The current I measured by the current transformer is also the phase current flowing through one phase of the sample.
According to the utility model, the neutral point is firstly opened in the body state, and then three outgoing lines are respectively arranged, so that the purpose of split-phase current measurement is achieved. Three independent 110 kV-level neutral points are led out for helping trial transformer, factors such as winding distribution of each phase, electromagnetic field effect and attractive layout are comprehensively considered, the three independent 110 kV-level neutral points are finally determined to be arranged on a specially-made lifting seat, the three sleeves of 1U-N, 1V-N and 1W-N are distributed on the lifting seat in a delta shape in the clockwise direction from the leading-out side of the U phase close to the high-voltage winding to facilitate wiring of the neutral points led out from the transformer body, independent grounding wires with enough length, current carrying capacity and insulating function are respectively installed on each terminal, reliable binding and fixing are carried out on the root parts of the sleeves, the rest parts are arranged along the lifting seat and the edge of an oil tank, and the circuit can smoothly pass through a current comparator when loss measurement of the three-phase parallel reactor is carried out, and then current signals are obtained phase by phase. The original lifting seat is improved, and the distance between the three sleeves is kept at a sufficient external insulation distance through reducing after the lifting seat is led out from the top of the oil tank.
As shown in fig. 3, which is a schematic diagram of the transformation of the test transformer of the present invention, according to the existing transformer structure, one original neutral point is disconnected, two neutral points are added, and a lead-out structure of three neutral points is realized; the high-voltage side of the existing test transformer is provided with a neutral point, and a neutral point bushing is a 110kV bushing. Disconnecting the original neutral points connected together from the body inside the oil tank, and respectively leading out two neutral points, as shown in fig. 4, which is a schematic structural diagram of the loss measuring device of the three-phase parallel reactor of the utility model; three neutral points are realized. With the addition of two neutral points, the bushing is still 110 kV.
The neutral point X, Y, Z of the test transformer is a neutral point in a grounding state after the three-phase windings of the three-phase reactor to be tested are respectively and correspondingly connected with the high-voltage side three-phase U, V, W phase windings of the test transformer, and two ends of each phase of branch formed after the three-phase reactor to be tested is connected with the high-voltage side of the test transformer are grounded.
The neutral point X, Y, Z of the test transformer is respectively connected with the grounding wires of the three neutral point sleeves of 1U-N, 1V-N and 1W-N;
each grounding wire is fixed at the root of the corresponding neutral point sleeve, and the rest grounding wires are arranged along the lifting seat and the edge of the oil tank; the distribution of the neutral point sleeve starts from the external leading-out side of the U phase of the high-voltage winding close to the test transformer, 1U-N, 1V-N and 1W-N sleeves are distributed clockwise for facilitating the leading-out of the neutral point from the transformer body, an independent grounding wire is respectively installed on each neutral point sleeve terminal, and finally the 1U-N, 1V-N and 1W-N neutral point sleeves are respectively connected with the neutral point X, Y, Z of the test transformer.
The grounding wires of the three neutral point sleeves of 1U-N, 1V-N and 1W-N are grounded.
The connecting lines of the projection geometric centers of the three sleeves on the lifting seat are in an isosceles triangle shape, so that the enough external insulation distance is ensured.
The diameter of the lifting seat is changed, so that the neutral point sleeves can be arranged on the lifting seat, and the geometric center of the lifting seat is unchanged. The diameter of the lifting seat is changed, so that the neutral point sleeves can be arranged on the lifting seat, and the geometric center of the lifting seat is unchanged.
The loss measurement of three-phase reactor, from the condition of understanding at present, adopt the examination of three neutral point structure to become, adopt three interim sleeve pipe than the sample, efficiency of software testing improves greatly.
Example 1:
after the trial transformer is transformed, taking phase C as an example, a voltage signal is obtained from the phase end of a high-voltage phase C of a test sample through a voltage transformer, a current signal is obtained from a neutral point Z on the side of the test transformer (obtained from the neutral point of the test sample before) through a current transformer, and then two groups of signals are simultaneously introduced into a reactor loss testing instrument.
The loss measurement of the reactor needs to measure the voltage and current of each phase of the reactor in principle, and the loss
Is the angle between the voltages U and I,
the measuring voltage and the measuring current are input into the loss measuring instrument, and then the loss value is automatically calculated by the instrument. The reactor loss measurement needs to be performed phase by phase, and the total loss is equal to the sum of three-phase losses.
Taking a model BKS-125000/420TH three-phase shunt reactor as an example, the data comparison before and after modification is as follows:
TABLE 1
Third, comparing before and after the test transformer is reformed
The loss measurement method of the three-phase shunt reactor achieves the purpose of effectively improving the loss measurement test efficiency by adjusting the current measurement position on the premise that the measurement principle is not changed, and simultaneously provides a new idea for subsequently designing a test transformer.
The utility model carries out low voltage test and external voltage withstand test of high voltage side to the improved test transformer, and carries out induced voltage test with partial discharge measurement; after the test is passed, the method can be used for measuring the loss of the three-phase shunt reactor.
The working principle of the utility model is as follows:
connecting a three-phase high-voltage winding of the tested three-phase reactor with a high-voltage side three-phase U, V, W phase winding of the testing transformer respectively, and grounding two ends of each phase of branch formed after the tested three-phase reactor is connected with the high-voltage side of the testing transformer;
leading out a neutral point X, Y, Z of a three-phase winding of the test transformer, and measuring loss through the neutral point of the test transformer; for each phase neutral point of a three-phase winding of a test transformer, a current transformer is connected in series between the neutral point and an earth point of the test transformer to measure the amplitude and the waveform of the current phase current, and a signal measured by the current transformer is input to a loss measuring instrument; the current I measured by the current transformer is the current phase current of the current phase of the test transformer and is equal to the current phase current of the current phase of the tested three-phase reactor;
measuring the amplitude and the waveform of a phase voltage U of the test transformer through a voltage transformer, wherein the amplitude and the waveform are equal to the amplitude and the waveform of the phase voltage of the current phase of the tested three-phase reactor, and the measuring signal is input to a loss measuring instrument;
the loss measuring instrument calculates U, I included angle according to the input waveform
The phase loss can be obtained, and then the total loss of the three-phase reactor can be obtained.
Claims (5)
1. A new loss measuring device of a three-phase shunt reactor is characterized by comprising a current transformer, a voltage transformer and a loss measuring instrument;
a neutral point X, Y, Z led out from the three-phase winding of the test transformer is connected with a grounding point in series, and a voltage transformer is connected between the high-voltage winding of the tested three-phase reactor and the neutral point in parallel;
the current transformer and the voltage transformer are connected with a loss measuring instrument;
the neutral point X, Y, Z of the test transformer is a neutral point in a grounding state after the three-phase windings of the three-phase reactor to be tested are respectively and correspondingly connected with the high-voltage side three-phase U, V, W phase windings of the test transformer, and two ends of each phase of branch formed after the three-phase reactor to be tested is connected with the high-voltage side of the test transformer are grounded.
2. The new three-phase shunt reactor loss measurement device as claimed in claim 1, wherein said neutral point X, Y, Z is connected to the grounding wires of three neutral point bushings 1U-N, 1V-N, 1W-N, respectively;
each grounding wire is fixed at the root of the corresponding neutral point sleeve, and the rest grounding wires are arranged along the lifting seat and the edge of the oil tank; the distribution of the neutral point sleeves starts from the external leading-out side of the U phase of the high-voltage winding close to the test transformer, 1U-N, 1V-N and 1W-N sleeves are distributed in the clockwise direction, an independent grounding wire is respectively installed on each neutral point sleeve terminal, and finally the 1U-N, 1V-N and 1W-N neutral point sleeves are respectively connected with the neutral point X, Y, Z of the test transformer.
3. The novel loss measurement device of the three-phase shunt reactor as claimed in claim 1, wherein grounding wires of three neutral point bushings of 1U-N, 1V-N and 1W-N are grounded.
4. A new three-phase shunt reactor loss measurement device according to claim 2, characterized in that: the connecting line of the geometric centers of the projections of the three neutral point sleeves on the lifting seat is in an isosceles triangle shape.
5. A new three-phase shunt reactor loss measurement device according to claim 4, characterized in that: the diameter of the lifting seat is changed, so that the neutral point sleeves can be arranged on the lifting seat, and the geometric center of the lifting seat is unchanged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121425234.2U CN215833516U (en) | 2021-06-25 | 2021-06-25 | Novel loss measuring device for three-phase shunt reactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121425234.2U CN215833516U (en) | 2021-06-25 | 2021-06-25 | Novel loss measuring device for three-phase shunt reactor |
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| CN215833516U true CN215833516U (en) | 2022-02-15 |
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| CN202121425234.2U Active CN215833516U (en) | 2021-06-25 | 2021-06-25 | Novel loss measuring device for three-phase shunt reactor |
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