CN214278401U - Capacitance voltage transformer damping loop detection system - Google Patents
Capacitance voltage transformer damping loop detection system Download PDFInfo
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- CN214278401U CN214278401U CN202022964478.XU CN202022964478U CN214278401U CN 214278401 U CN214278401 U CN 214278401U CN 202022964478 U CN202022964478 U CN 202022964478U CN 214278401 U CN214278401 U CN 214278401U
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Abstract
The utility model discloses a capacitance voltage transformer damping loop detection system, which comprises a capacitance voltage transformer damping loop, a frequency conversion device and a test power supply; the damping loop of the capacitor voltage transformer consists of a capacitor and an inductor which are connected in parallel and then connected with a resistor in series; the output end of the damping loop of the capacitor voltage transformer is connected with a frequency conversion device, and the frequency conversion device is connected with a test power supply; after the detection system is connected to the damping loop of the capacitor voltage transformer, the auxiliary winding is in short circuit, and fixed voltage with rated frequency is injected into the damping loop of the capacitor voltage transformer through the frequency conversion device, so that the loop is in a resonant high-impedance state for detection; or, the frequency of the damping loop injected into the capacitor voltage transformer is adjusted, and the detection is carried out under the non-rated frequency, so that the purpose of detecting whether the damping loop has faults or not is achieved.
Description
Technical Field
The utility model relates to an electric power system's damping detection area especially relates to a capacitance voltage transformer damping circuit detecting system.
Background
A capacitor voltage transformer in a power system adopts a resonance type damper, and a capacitor and an inductor are connected in parallel and then connected in series with a resistor. According to the electrical principle of the resonance type damper, a capacitor and a reactor of the capacitor voltage transformer are in a parallel resonance state under rated frequency, the impedance of a damping loop is extremely high, the current flowing through the resistor is extremely small, and the resistor does not generate heat.
When the damping loop component of the capacitor voltage transformer is damaged, the parallel resonance state is damaged, the current flowing through the resistor is increased, the resistor consumes energy, heat is generated along with power consumption, and the temperature of the oil tank of the electromagnetic unit of the capacitor voltage transformer is increased to a certain degree. When the frequency changes, the resonance conditions of the inductor and the capacitor in the damping loop of the capacitor voltage transformer are destroyed, and the current flows through the resistor to generate heat.
SUMMERY OF THE UTILITY MODEL
Overcome above the defect, the utility model provides a capacitance voltage transformer damping circuit detecting system carries out effective detection to capacitance voltage transformer damping circuit.
The utility model discloses perfect on the power frequency measurement detecting system's that adopts at present basis, the voltage frequency who pours into capacitive voltage transformer damping circuit into is adjustable.
The technical scheme of the utility model is specifically as follows:
a capacitance voltage transformer damping loop detection system comprises a capacitance voltage transformer damping loop, a frequency conversion device and a test power supply;
the damping loop of the capacitor voltage transformer consists of a capacitor and an inductor which are connected in parallel and then connected with a resistor in series; the output end of the damping loop of the capacitor voltage transformer is connected with a frequency conversion device, and the frequency conversion device is connected with a test power supply;
after the detection system is connected to the damping loop of the capacitor voltage transformer, the auxiliary winding is in short circuit, and fixed voltage with rated frequency is injected into the damping loop of the capacitor voltage transformer through the frequency conversion device, so that the loop is in a resonant high-impedance state for detection; or adjusting the frequency of the damping loop injected into the capacitor voltage transformer, and detecting under the non-rated frequency.
Furthermore, the frequency conversion device comprises a frequency converter, a frequency converter control panel and a frequency converter panel, wherein the frequency converter control panel and the frequency converter panel are connected with the frequency converter, the current measurement unit is arranged between the frequency converter and the frequency converter control panel, and the voltage measurement unit is arranged at one end of the frequency converter control panel.
Furthermore, the head end and the tail end of the damping loop of the capacitor voltage transformer are connected with a frequency conversion device through test wires, and the frequency conversion device is connected with a test power supply through the test wires.
Compared with the prior art, the utility model discloses beneficial effect as follows:
the utility model discloses novel structure adjusts the voltage frequency who pours into capacitive voltage transformer damping circuit into, and voltage, the electric current of measuring circuit under non-rated frequency carry out analysis, comparison with the measuring result and the test data of dispatching from the factory to reach the purpose of detecting whether there is the trouble in damping circuit.
The voltage frequency injected into a damping loop (device) of the capacitive voltage transformer is adjusted to a rated frequency, so that the loop (device) is in a resonance high-impedance state, the voltage, the current and the frequency at the moment are measured, and the measurement result is analyzed and compared with factory data, so that the purpose of detecting whether the damping loop (device) has a fault is achieved.
Drawings
FIG. 1 is a system block diagram of the system of the present invention;
fig. 2 is a schematic structural diagram of the damping circuit of the present invention;
fig. 3 is a schematic structural view of the frequency conversion device of the utility model;
fig. 4 is a schematic diagram of the structure of the present invention connected to the capacitor voltage transformer.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments belong to the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.
Example 1
As shown in fig. 1 and 4, the system for detecting a damping loop of a frequency-adjustable capacitor voltage transformer in this embodiment includes a damping loop 1 of a capacitor voltage transformer, a frequency conversion device 2, a test power supply 3, and a test line 4 connecting each component.
A testing loop of the detection system is connected with a damping loop 1 of the capacitor voltage transformer, a frequency conversion device 2 and a testing power supply 3 through a testing wire 4. The ends d1 and d2 of the damping loop 1 of the capacitor voltage transformer are connected with the frequency conversion device 2, and the frequency conversion device 2 is connected with the test power supply 3.
As shown in fig. 2, the damping loop 1 of the capacitor voltage transformer is formed by connecting a capacitor 5 and an inductor 6 in parallel and then connecting a resistor 7 in series.
As shown in fig. 3, the frequency conversion device 2 is composed of a frequency converter 8, a frequency converter control board 9, a frequency converter panel 10, a current measurement unit 11, and a voltage measurement unit 12.
The frequency converter 8 is connected with a frequency converter control panel 9 and a frequency converter panel 10, the current measuring unit 11 is arranged between the frequency converter 8 and the frequency converter control panel 9, and the voltage measuring unit 12 is arranged at one end of the frequency converter control panel 9. The frequency converter control board 9 is used for adjusting the input voltage, current and frequency, and the current measuring unit 11 and the voltage measuring unit 12 can be devices for testing voltage and current such as an existing ammeter and a voltmeter.
The detection method of the embodiment comprises the following steps:
and (3) short-circuiting the terminals da and dn of the auxiliary winding, adjusting the voltage frequency injected into the damping loop of the capacitive voltage transformer to a rated frequency, so that the loop is in a resonant high-impedance state, measuring the voltage and the current of the loop, analyzing and comparing the measurement result with factory test data, and judging according to the judgment that the field test data is compared with a reference value provided by an equipment manufacturer while being compared transversely (in the same batch and in the same model), wherein the reference value range provided by the manufacturer is within the range, and if the transverse comparison is almost free from deviation, no fault exists, otherwise, the fault exists. Therefore, the purpose of detecting whether the damping loop has a fault is achieved.
Example 2
The damping loop detection system of the capacitance voltage transformer with adjustable frequency of the embodiment is the same as that of the embodiment 1.
The detection method of the embodiment comprises the following steps:
and (3) short-circuiting the terminals da and dn of the auxiliary winding, adjusting the voltage frequency injected into the damping loop of the capacitor voltage transformer, measuring the voltage, the current and the frequency of the damping loop when the frequency is not rated, transversely analyzing and comparing the measurement results of products in the same batch and the same model, and under the condition that the voltage and the frequency are the same, indicating that the damping loop unit device has a fault when the current measurement value is obviously deviated from the reference value provided by an equipment manufacturer, thereby achieving the purpose of detecting whether the damping loop has the fault.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides a capacitance voltage transformer damping circuit detecting system which characterized in that: the device comprises a damping loop of a capacitive voltage transformer, a frequency conversion device and a test power supply;
the damping loop of the capacitor voltage transformer consists of a capacitor and an inductor which are connected in parallel and then connected with a resistor in series; the output end of the damping loop of the capacitor voltage transformer is connected with a frequency conversion device, and the frequency conversion device is connected with a test power supply;
after the detection system is connected to the damping loop of the capacitor voltage transformer, the auxiliary winding is in short circuit, and fixed voltage with rated frequency is injected into the damping loop of the capacitor voltage transformer through the frequency conversion device, so that the loop is in a resonant high-impedance state for detection; or adjusting the frequency of the damping loop injected into the capacitor voltage transformer, and detecting under the non-rated frequency.
2. The capacitive voltage transformer damping loop detection system of claim 1 wherein: the frequency conversion device comprises a frequency converter, a frequency converter control panel and a frequency converter panel, wherein the frequency converter control panel and the frequency converter panel are connected with the frequency converter, the current measurement unit is arranged between the frequency converter and the frequency converter control panel, and the voltage measurement unit is arranged at one end of the frequency converter control panel.
3. The capacitive voltage transformer damping loop detection system of claim 1 wherein: the head end and the tail end of the damping loop of the capacitor voltage transformer are connected with a frequency conversion device through test wires, and the frequency conversion device is connected with a test power supply through the test wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022964478.XU CN214278401U (en) | 2020-12-11 | 2020-12-11 | Capacitance voltage transformer damping loop detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022964478.XU CN214278401U (en) | 2020-12-11 | 2020-12-11 | Capacitance voltage transformer damping loop detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214278401U true CN214278401U (en) | 2021-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022964478.XU Active CN214278401U (en) | 2020-12-11 | 2020-12-11 | Capacitance voltage transformer damping loop detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214278401U (en) |
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2020
- 2020-12-11 CN CN202022964478.XU patent/CN214278401U/en active Active
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