CN108169575B - Method for testing dielectric loss and capacitance of CVT capacitor - Google Patents
Method for testing dielectric loss and capacitance of CVT capacitor Download PDFInfo
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- CN108169575B CN108169575B CN201810038192.3A CN201810038192A CN108169575B CN 108169575 B CN108169575 B CN 108169575B CN 201810038192 A CN201810038192 A CN 201810038192A CN 108169575 B CN108169575 B CN 108169575B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The embodiment of the application discloses a method for testing capacitance dielectric loss and capacitance of a CVT (constant voltage transformer). A differential current sensor is clamped at a high-voltage drainage end of the CVT, and a shielded test wire is respectively connected with the differential current sensor and a full-automatic anti-interference dielectric loss tester; the high-voltage test line is respectively connected with a high-voltage test end of the full-automatic anti-interference dielectric loss tester and a high-voltage terminal of the CVT, and a low-voltage terminal of the CVT is grounded; the first CVT self-excitation method secondary pressurization line is connected with the low-voltage testing end of the full-automatic anti-interference dielectric loss tester and the da end of the CVT, and the second CVT self-excitation method secondary pressurization line is connected with the grounding end of the full-automatic anti-interference dielectric loss tester and the dn end of the CVT. The current of the main capacitor of the CVT is acquired by adopting a differential current sensor, and the capacitance and dielectric loss value of the main capacitor and the sub-capacitor of the CVT can be rapidly and accurately measured by combining a full-automatic anti-interference dielectric loss tester.
Description
Technical Field
The application relates to the technical field of electrical measurement, in particular to a method for testing dielectric loss and capacitance of a CVT capacitor.
Background
A Capacitor Voltage Transformer (CVT) functions in an electrical power system to measure voltage for meters and protection devices, and may couple a carrier frequency to a power line for long distance communication, remote measurement, selective line high frequency protection, and the like.
Preventive test protocols require: when the electromagnetic unit is used as a power supply to measure the capacitance of the main capacitor and the sub capacitor of the capacitive voltage divider of the capacitive voltage transformer and the dielectric loss of the capacitors, the measurement is carried out according to the manufacturer's regulations. The CVT self-excitation method is adopted for testing in both factory test and field handover in a manufacturing factory.
The CVT self-excitation method was also used for the preventive tests. When a Capacitance Voltage Transformer (CVT) with 110kV and 35kV voltage levels is subjected to self-excitation method dielectric loss and capacitance test, a high-voltage drainage wire of the transformer needs to be disconnected. Because of the mutual-inductor generally all erects on the framework that 2m is high, throw off mutual-inductor high pressure drainage line and need personnel to climb to the high department and go on, have the high altitude construction risk, and throw off before the experiment, experimental recovery will waste a large amount of test time of testing personnel. Therefore, the traditional CVT capacitor dielectric loss and capacitance testing work difficulty is high, and the work efficiency is low.
Disclosure of Invention
The application provides a test method for dielectric loss and capacitance of a CVT capacitor, which aims to solve the problem of low working efficiency of the traditional CVT capacitor dielectric loss and capacitance test.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
a CVT capacitance dielectric loss and capacitance testing device comprises: differential current sensor, area shielding test wire, full-automatic anti-interference dielectric loss tester, high-pressure test wire and CVT self excitation method secondary pressure line, wherein: the differential current sensor is clamped at a high-voltage drainage end of the CVT, and the test wire with the shielding is respectively connected with the differential current sensor and the full-automatic anti-interference dielectric loss tester; the high-voltage test line is respectively connected with a high-voltage test end of the full-automatic anti-interference dielectric loss tester and a high-voltage terminal of the CVT, and a low-voltage terminal of the CVT is grounded; the CVT self-excitation secondary pressurization line comprises a first CVT self-excitation secondary pressurization line and a second CVT self-excitation secondary pressurization line, the first CVT self-excitation secondary pressurization line is connected with the low-voltage testing end of the full-automatic anti-interference dielectric loss tester and the da end of the CVT, and the second CVT self-excitation secondary pressurization line is connected with the grounding end of the full-automatic anti-interference dielectric loss tester and the dn end of the CVT.
Alternatively, the differential current sensor is a toroidal coil uniformly wound on a non-ferromagnetic material and the output signal is the current integrated over time.
Optionally, the high voltage drain of the CVT is connected to a high voltage drain conductor, and the differential current sensor is connected to the high voltage drain conductor.
Optionally, the high-voltage drainage wire is provided with a ground wire, one end of the ground wire is connected with the high-voltage drainage wire, and the other end of the ground wire is grounded.
A CVT capacitance dielectric loss and capacitance testing method utilizes a CVT capacitance dielectric loss and capacitance testing device, and the method comprises the following steps: the differential current sensor collects the current flowing through a main capacitor in the CVT and transmits the current to the full-automatic anti-interference dielectric loss tester; acquiring a voltage-dividing capacitor and a standard capacitor of a full-automatic anti-interference dielectric loss tester which are connected in series to serve as a standard capacitor of a test loop; obtaining a loop current in the test loop; calculating the voltage at two ends of a standard capacitor of the full-automatic anti-interference dielectric loss tester according to the loop current and the standard capacitance value of the full-automatic anti-interference dielectric loss tester; acquiring the capacitance and dielectric loss value of a main capacitor according to the current flowing through the main capacitor in the CVT and the voltage at two ends of a standard capacitor of the full-automatic anti-interference dielectric loss tester; and determining the capacitance and the dielectric loss value of the voltage division capacitor according to the capacitance and the dielectric loss value of the main capacitor.
According to the technical scheme, the CVT capacitance dielectric loss and capacitance testing method provided by the embodiment of the application comprises the following steps: differential current sensor, area shielding test wire, full-automatic anti-interference dielectric loss tester, high-pressure test wire and CVT self excitation method secondary pressure line, wherein: the differential current sensor is clamped at a high-voltage drainage end of the CVT, and the test wire with the shielding is respectively connected with the differential current sensor and the full-automatic anti-interference dielectric loss tester; the high-voltage test line is respectively connected with a high-voltage test end of the full-automatic anti-interference dielectric loss tester and a high-voltage terminal of the CVT, and a low-voltage terminal of the CVT is grounded; the CVT self-excitation secondary pressurization line comprises a first CVT self-excitation secondary pressurization line and a second CVT self-excitation secondary pressurization line, the first CVT self-excitation secondary pressurization line is connected with the low-voltage testing end of the full-automatic anti-interference dielectric loss tester and the da end of the CVT, and the second CVT self-excitation secondary pressurization line is connected with the grounding end of the full-automatic anti-interference dielectric loss tester and the dn end of the CVT. The current of the main capacitor of the CVT is acquired by adopting a differential current sensor, and the capacitance and dielectric loss value of the main capacitor and the sub-capacitor of the CVT can be rapidly and accurately measured by combining a full-automatic anti-interference dielectric loss tester.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a CVT capacitor dielectric loss and capacitance testing apparatus provided in the present application;
fig. 2 is a testing schematic diagram of a testing apparatus for dielectric loss and capacitance of a CVT capacitor provided in the present application;
the symbols in fig. 1-2 are represented as:
the test method comprises the following steps of 1-a differential current sensor, 2-a shielded test wire, 3-a full-automatic anti-interference dielectric loss tester, 4-a high-voltage test wire, 5-a CVT self-excitation secondary pressurization wire, 51-a first CVT self-excitation secondary pressurization wire, 52-a second CVT self-excitation secondary pressurization wire, 6-a high-voltage drainage wire, 7-a grounding wire and 8-a CVT.
Detailed Description
The present application will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a CVT capacitance medium loss and capacitance testing apparatus provided in the present application is shown in fig. 1, where the apparatus includes: the device comprises a differential current sensor 1, a shielded test wire 2, a full-automatic anti-interference dielectric loss tester 3, a high-voltage test wire 4 and a CVT self-excitation method secondary voltage-adding wire 5.
The differential current sensor 1 is clamped at a high-voltage current leading end of the CVT8, the differential current sensor is a ring-shaped coil uniformly wound on a non-ferromagnetic material, an output signal is the integral of current over time, and the input current can be really restored through a circuit for integrating an output voltage signal. The high voltage lead end of the CVT8 is connected to a high voltage lead wire 6, and the differential current sensor 1 is connected to the high voltage lead wire 6. The high-voltage drainage wire 6 is provided with a grounding wire 7, one end of the grounding wire 7 is connected with the high-voltage drainage wire 6, and the other end of the grounding wire is grounded.
The belt shielding test wire 2 is respectively connected with the differential current sensor 1 and the full-automatic anti-interference dielectric loss tester 3, and one end of the belt shielding test wire 2, which is connected with the differential current sensor 1, is communicated with the high-voltage current-guiding wire 6. The high-voltage test line 4 is respectively connected with the high-voltage test end of the full-automatic anti-interference dielectric loss tester 3 and the high-voltage terminal of the CVT8, and the low-voltage terminal of the CVT8 is grounded.
The CVT self-excited secondary boost line 5 comprises a first CVT self-excited secondary boost line 51 and a second CVT self-excited secondary boost line 52, the first CVT self-excited secondary boost line 51 is connected with the low-voltage testing end of the full-automatic anti-interference dielectric loss tester 3 and the da end of the CVT8, and the second CVT self-excited secondary boost line 52 is connected with the grounding end of the full-automatic anti-interference dielectric loss tester 3 and the dn end of the CVT 8.
As can be seen from the foregoing embodiments, the CVT capacitance dielectric loss and capacitance testing apparatus provided in the embodiments of the present application includes: differential current sensor 1, area shielding test wire 2, full-automatic anti-interference dielectric loss tester 3, high-voltage test wire 4 and CVT self excitation method secondary pressurization line 5, wherein: the differential current sensor 1 is clamped at a high-voltage current leading end of the CVT8, and the test wire 2 with shielding is respectively connected with the differential current sensor 1 and the full-automatic anti-interference dielectric loss tester 3; the high-voltage test line 4 is respectively connected with a high-voltage test end of the full-automatic anti-interference dielectric loss tester 3 and a high-voltage terminal of the CVT8, and a low-voltage terminal of the CV8T is grounded; the CVT self-excited secondary boost line 5 comprises a first CVT self-excited secondary boost line 51 and a second CVT self-excited secondary boost line 52, the first CVT self-excited secondary boost line 51 is connected with the low-voltage testing end of the full-automatic anti-interference dielectric loss tester 3 and the da end of the CVT8, and the second CVT self-excited secondary boost line 52 is connected with the grounding end of the full-automatic anti-interference dielectric loss tester 3 and the dn end of the CVT 8. The differential current sensor 1 is adopted to collect the current of the main capacitor of the CVT8, and the capacitance and dielectric loss value of the main capacitor and the sub-capacitor of the CVT can be rapidly and accurately measured by combining with a full-automatic anti-interference dielectric loss tester.
Fig. 2 is a schematic diagram illustrating a testing principle of the testing apparatus for capacitance medium loss and capacitance of the CVT provided by the present application, in fig. 2, C11 is a main capacitor of the CVT8, C2 is a voltage dividing capacitor of the CVT8, and C11 and C2 are connected in series. The capacitance and dielectric loss values of the CVT main capacitor C11 and the voltage dividing capacitor C2 were measured by using the intermediate transformer of the CVT8 as a test transformer, applying a voltage from the secondary side to excite it, and inducing a high voltage on the primary side as a power supply.
When in-situ measurement is carried out, the method comprises the following steps: reliably grounding a high-voltage drainage wire 6 connected to a high-voltage drainage end of a capacitor voltage transformer through a grounding wire 7, winding a differential current sensor 1 on the high-voltage drainage wire of the capacitor voltage transformer within the suspended grounding wire and fixing the differential current sensor, connecting the differential current sensor 1 to a full-automatic anti-interference dielectric loss tester 3 through a shielded test wire 2, disconnecting a tail end N of the capacitor voltage transformer, and connecting a high-voltage test wire 4 to the full-automatic anti-interference dielectric loss tester 3; a first CVT self-excited secondary boost line 51 and a second CVT self-excited secondary boost line 52 are connected from the fully automatic jam-tolerant dielectric loss tester 3 to the secondary terminals da, dn of the capacitor voltage transformer.
The principle of the measuring method is as follows: when the main capacitor C11 of the CVT8 is measured, the current flowing through the main capacitor C11 is collected by the differential current sensor 1 and transmitted to the full-automatic anti-interference dielectric loss tester 3 through the shielded test wire 2, and the voltage-dividing capacitor C2 is connected with the standard capacitor of the full-automatic anti-interference dielectric loss tester 3 in series to serve as the standard capacitor of the test loop. And acquiring the test loop current, and calculating the voltage on the standard capacitor of the full-automatic anti-interference dielectric loss tester 3 according to the test loop current and the standard capacitance value of the full-automatic anti-interference dielectric loss tester 3. And obtaining the capacitance and dielectric loss value of the main capacitor C11 according to the current acquired by the differential current sensor 1 and the calculated voltage on the standard capacitor of the full-automatic anti-interference dielectric loss tester 3.
When the voltage-dividing capacitor C2 is measured, the standard capacitor C11 with the determined capacitance and dielectric loss value is used for measurement, and the capacitance and the dielectric loss value of the voltage-dividing capacitor C2 are obtained in the same way. In the test, because the capacitance of the standard capacitor of the full-automatic anti-interference dielectric loss tester 3 is far smaller than that of the divided voltage C2, the standard capacitor of the test loop is formed by connecting C2 and Cn in series, and the influence on the test result can be ignored. The method enables a tester to accurately and quickly test the dielectric loss and capacitance of the main capacitor and the voltage dividing capacitor of the CVT without dismantling the high-voltage drainage wire of the capacitor voltage transformer.
By the aid of the method for testing dielectric loss and capacitance of the CVT capacitor, capacitance and dielectric loss values of the CVT main capacitor and the voltage dividing capacitor can be tested quickly and accurately without dismounting the high-voltage drainage wire of the CVT.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (4)
1. A CVT capacitance dielectric loss and capacitance testing method is characterized in that based on a CVT capacitance dielectric loss and capacitance testing device, the testing device comprises: differential current sensor (1), area shielding test wire (2), full-automatic anti-interference dielectric loss tester (3), high-voltage test wire (4) and CVT self excitation method secondary pressurization line (5), wherein: the differential current sensor (1) is clamped at a high-voltage drainage end of the CVT, and the test wire (2) with the shielding is respectively connected with the differential current sensor (1) and the full-automatic anti-interference dielectric loss tester (3); the high-voltage test line (4) is respectively connected with a high-voltage test end of the full-automatic anti-interference dielectric loss tester (3) and a high-voltage terminal of the CVT, and a low-voltage terminal of the CVT is grounded; the CVT self-excitation secondary voltage adding line (5) comprises a first CVT self-excitation secondary voltage adding line (51) and a second CVT self-excitation secondary voltage adding line (52), the first CVT self-excitation secondary voltage adding line (51) is connected with the low-voltage testing end of the full-automatic anti-interference dielectric loss tester (3) and the da end of the CVT, and the second CVT self-excitation secondary voltage adding line (52) is connected with the grounding end of the full-automatic anti-interference dielectric loss tester (3) and the dn end of the CVT; the method comprises the following steps:
the differential current sensor (1) collects the current flowing through a main capacitor in the CVT and transmits the current to the full-automatic anti-interference dielectric loss tester (3);
acquiring a standard capacitor of a full-automatic anti-interference dielectric loss tester (3) connected in series with a voltage-dividing capacitor as a standard capacitor of a test loop;
obtaining a loop current in the test loop;
calculating the voltage at two ends of a standard capacitor of the full-automatic anti-interference dielectric loss tester (3) according to the loop current and the standard capacitance value of the full-automatic anti-interference dielectric loss tester (3);
acquiring the capacitance and dielectric loss value of a main capacitor according to the current flowing through the main capacitor in the CVT and the voltage at two ends of a standard capacitor of the full-automatic anti-interference dielectric loss tester (3);
and determining the capacitance and the dielectric loss value of the voltage division capacitor according to the capacitance and the dielectric loss value of the main capacitor.
2. The method for testing capacitance-medium loss and capacitance of a CVT according to claim 1, characterized in that the differential current sensor (1) is a toroidal coil uniformly wound on a non-ferromagnetic material, and the output signal is the integral of the current with respect to time.
3. The method for testing capacitance medium loss and capacitance of the CVT according to claim 1 or 2, characterized in that a high voltage lead wire (6) is connected to a high voltage lead end of the CVT, and the differential current sensor (1) is connected to the high voltage lead wire (6).
4. The method for testing dielectric loss and capacitance of the CVT capacitor according to claim 3, wherein the high voltage drain lead (6) is provided with a grounding wire (7), and one end of the grounding wire (7) is connected with the high voltage drain lead (6) while the other end is grounded.
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| CN108761212B (en) * | 2018-07-20 | 2023-12-29 | 国网吉林省电力有限公司电力科学研究院 | Constant low temperature and high voltage test device and test method for transformer main equipment |
| CN110221130A (en) * | 2019-04-22 | 2019-09-10 | 贵州电网有限责任公司 | A kind of capacitance type potential transformer measurement structure and measurement method |
| CN111856381B (en) * | 2020-07-27 | 2022-04-22 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Disassembling and defect checking method of oil-immersed upright current transformer |
| CN112485535A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Test method for 110kV capacitor voltage transformer without disassembling lead |
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