CN117907658A - Switch arc voltage measuring device and method - Google Patents
Switch arc voltage measuring device and method Download PDFInfo
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- CN117907658A CN117907658A CN202311785579.2A CN202311785579A CN117907658A CN 117907658 A CN117907658 A CN 117907658A CN 202311785579 A CN202311785579 A CN 202311785579A CN 117907658 A CN117907658 A CN 117907658A
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Abstract
The device comprises a high-voltage arm measurement capacitor C1 and a low-voltage arm measurement capacitor C2, wherein the high-voltage arm measurement capacitor C1 and the low-voltage arm measurement capacitor C2 are connected in series and then are connected to two ends of a fracture of a switch contact to be detected in parallel, a fixed proportional relationship exists between the capacitance value of the high-voltage arm measurement capacitor C1 and the capacitance value of the low-voltage arm measurement capacitor C2, a signal acquisition unit is connected with the low-voltage arm measurement capacitor C2 to acquire and preprocess a voltage signal input by the low-voltage arm measurement capacitor C2 to obtain voltage data, and a data processing and display unit is connected with the signal acquisition unit to receive the voltage data at two ends of the low-voltage arm measurement capacitor C2 and determine arc voltages at two ends of the fracture of the switch contact to be detected according to the proportional relationship so as to reconstruct and display waveforms.
Description
Technical Field
The invention relates to the technical field of voltage measurement of switching equipment, in particular to a switching arc voltage measurement device and a switching arc voltage measurement method.
Background
The direct-current power switch equipment, in particular to a direct-current breaker with medium-high voltage level, is used as engineering backbone equipment in a direct-current power system, is responsible for completing the operation mode switching and line fault clearing of the direct-current power transmission system, and has great significance in guaranteeing the safe, economic and flexible operation of the direct-current power system. In particular, in the field of rail transit, a direct current breaker is used as an indispensable key protection device of a rail traction direct current power supply system, and along with the large-scale construction of rail transit, the rail traction direct current power supply system is widely applied, and the demand for a medium-high voltage direct current breaker with good breaking capability is also increased.
The arc voltage is an important parameter capable of reflecting the arc extinguishing performance of the medium-high voltage direct current breaker to a great extent, and meanwhile, the arc voltage can also accurately reflect the action state of the moving and static contacts of the breaker in the opening process, which is beneficial to the design and research and development of many manual zero-crossing type high-voltage and high-capacity direct current breakers. Therefore, numerous researchers and engineering designers have been interested in its measurement for many years.
However, in the current practical engineering application, because the system voltage level of the direct current breaker is higher, taking the medium and high voltage direct current breaker as an example, the system voltage is at least above kilovolts, and even up to tens of kilovolts, and in view of the fact that once the power switching equipment such as the breaker performs the opening operation, the two ends of the formed movable and static contact fracture bear corresponding system voltages, the voltage measurement at the two ends of the movable and static contact fracture obviously cannot adopt a common low voltage measurement means; however, if a measuring instrument device with a high voltage class such as a high voltage probe is adopted, the accuracy of the result is difficult to be ensured in consideration of the large measuring range and high graduation value of the high voltage probe, and the great error exists in measuring the arc voltage between the breaks formed in the breaking process of the power switching equipment such as a breaker.
The information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the defects or the shortcomings existing in the prior art, the switching arc voltage measuring device and the measuring method thereof overcome the defects and the shortcomings of the existing measuring device or measuring instrument, not only can accurately measure the arc voltage between the breaks formed in the switching-off process of the switch, but also can bear the system voltage added between the breaks of the switch after the switching-off process is completed, and maintain good insulating performance without influencing the normal work and the insulating performance of the switching equipment.
The aim of the invention is achieved by the following technical scheme.
The switching arc voltage measuring device comprises a switching arc voltage measuring device,
The measuring capacitor unit comprises a high-voltage arm measuring capacitor C1 and a low-voltage arm measuring capacitor C2, wherein the high-voltage arm measuring capacitor C1 and the low-voltage arm measuring capacitor C2 are connected in series and then are connected with two ends of a contact fracture of a switch to be measured in parallel, the capacitance value of the high-voltage arm measuring capacitor C1 and the capacitance value of the low-voltage arm measuring capacitor C2 have a fixed proportional relationship,
A signal acquisition unit connected with the low-voltage arm measurement capacitor C2 to acquire and preprocess the voltage signal input by the low-voltage arm measurement capacitor C2 to obtain voltage data,
And the data processing and displaying unit is connected with the signal acquisition unit to receive the voltage data at the two ends of the low-voltage arm measurement capacitor C2, and determine the arc voltage at the two ends of the fracture of the switch contact to be tested according to the proportional relation, so that waveform reconstruction and display are realized.
The switching arc voltage measuring device also comprises a power supply unit which is electrically connected with the signal acquisition unit and the data processing unit and used for providing working voltage, wherein the power supply unit comprises an external power supply module and an internal self-power-taking power supply module.
In the switching arc voltage measuring device, the external power supply module comprises a mains supply, a switching power supply or a battery pack, and the internal self-power-taking power supply module comprises an induction power-taking unit.
In the switching arc voltage measuring device, the high-voltage arm measuring capacitor C1 and the low-voltage arm measuring capacitor C2 are space coupling capacitors with fixed volume values, which are formed by metal electrodes and current-carrying conductors.
In the switching arc voltage measuring device, the space coupling capacitor comprises a metal electrode, an electrode substrate, an insulating medium and a current-carrying conductor.
In the switching arc voltage measuring device, the insulating medium is a medium made of nylon or rubber, and the current-carrying conductor is a conductor made of copper or aluminum.
In the switching arc voltage measuring device, a metal electrode is in contact with an insulating medium in a fully-closed or partially-closed mode, the insulating medium is partially covered on the surface of a current-carrying conductor, and an electrode substrate is a protective substrate covered on the bottom surface of the metal electrode.
In the switching arc voltage measuring device, the space coupling capacitor is of a symmetrical structure symmetrical relative to the current-carrying conductor.
In the switching arc voltage measuring device, the signal acquisition unit comprises,
The input end of the isolation sampling module is directly connected with the low-voltage arm measuring capacitor C2 to perform isolation sampling processing on the voltage signal,
The input end of the filtering module is directly connected with the output end of the isolation sampling module to carry out filtering processing on the acquired voltage signals,
And the input end of the amplifying module is directly connected with the output end of the filtering module so as to amplify the voltage signal after the filtering processing.
The measuring method of the switching arc voltage measuring device comprises the following steps,
Step S1: switching the switching arc voltage measuring device into two ends of a movable contact and a fixed contact of the switching equipment, wherein the break voltage is U;
Step S2: when the switching device is switched on, the break voltage U is 0;
Step S3: when switching equipment starts to switch off, an arc is generated between moving and static contacts of the switching equipment, a fracture voltage U is equal to an arc voltage, the arc length is stretched along with the continuous increase of the distance between the moving and static contacts, the arc voltage is gradually increased, the arc voltage is kept constant after entering a stable arcing stage, in the process, a measuring capacitor unit bears a transient arc voltage with a high-frequency change amplitude, and according to the proportional relation between a measuring capacitor of a high-voltage arm and a measuring capacitor of a low-voltage arm, a dynamically-changed arc voltage signal is led out proportionally and is sent to a signal acquisition unit at the rear end;
Step S4: the signal acquisition unit is directly connected with the low-voltage arm measurement capacitor C2, and acquires and pre-processes voltage signals of partial voltage of arc voltage born by two ends of the low-voltage arm measurement capacitor C2 to obtain voltage data;
Step S5: the data processing and displaying unit is directly connected with the signal collecting unit and is used for receiving the voltage data at two ends of the low-voltage arm measuring capacitor C2 after collection and pretreatment, determining arc voltage at two ends of a fracture of the switch equipment to be tested according to the proportional relation between the high-voltage arm measuring capacitor C1 and the low-voltage arm measuring capacitor C2, and realizing arc voltage waveform reconstruction and display;
Step S6: when the switching equipment is switched off, after the electric arc is extinguished, the voltage at two ends of a fracture of the switching equipment is equal to the system voltage, and at the moment, the measuring capacitor unit directly bears the system high voltage and shows fracture characteristics without affecting the normal operation of the switching equipment.
Compared with the prior art, the invention has the beneficial effects that:
The invention realizes the real-time measurement of the switch arc voltage by adopting the capacitive voltage division, and simultaneously utilizes the characteristics of direct current isolation and alternating current communication of the capacitor, and the measurement capacitor unit shows complete fracture characteristics for the direct current system voltage, so that the normal operation and the insulation performance of the switch equipment are not affected. The voltage-dividing capacitor is not limited to a standard structure capacitor with a fixed volume value, and a space coupling capacitor with the fixed volume value formed by the metal electrode and the current-carrying conductor is used, so that the application condition and the application range are expanded. The measuring capacitor unit has smaller volume and simple structure, is particularly suitable for being arranged inside the switch power equipment with limited space, and the signal acquisition unit, the data processing unit and the power supply unit can realize modularized design, thereby being more beneficial to the integrated design and development of the voltage measuring device and the switch power equipment body.
The description is merely an overview of the technical solutions of the present invention, in order to make the technical means of the present invention more clearly apparent to those skilled in the art, and in order to make the description of the present invention and other objects, features and advantages of the present invention more obvious, the following description of the specific embodiments of the present invention will be exemplified.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is evident that the figures described below are only some embodiments of the invention, from which other figures can be obtained without inventive effort for a person skilled in the art. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
Fig. 1 is a schematic structural diagram of a switching arc voltage measuring device according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a space-coupling capacitor of a switching arc voltage measurement device according to an embodiment of the present invention;
Fig. 3 is a flow chart of a measuring method of a switching arc voltage measuring device according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a measuring capacitor unit of a switching arc voltage measuring device according to an embodiment of the present invention;
FIGS. 5 (a) to 5 (c) are schematic diagrams showing the results of one measurement embodiment based on the measuring device of the present invention, wherein FIG. 5 (a) is the partial pressure output measured by the measuring capacitor unit; FIG. 5 (b) is the measured arc voltage of the voltage probe; fig. 5 (c) is a waveform comparison diagram of both in the same coordinate system.
The invention is further explained below with reference to the drawings and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will understand that a person may refer to the same component by different names. The description and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components. As used throughout the specification and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description hereinafter sets forth a preferred embodiment for practicing the invention, but is not intended to limit the scope of the invention, as the description proceeds with reference to the general principles of the description. The scope of the invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the invention, reference will now be made to the drawings of several embodiments illustrated in the drawings, and the accompanying drawings are not to be taken as limiting the embodiments of the invention.
For better understanding, as shown in fig. 1 to 5 (c), a switching arc voltage measuring device includes,
The measuring capacitor unit comprises a high-voltage arm measuring capacitor C1 and a low-voltage arm measuring capacitor C2, wherein the high-voltage arm measuring capacitor C1 and the low-voltage arm measuring capacitor C2 are connected in series and then are connected with two ends of a contact fracture of a switch to be measured in parallel, the capacitance value of the high-voltage arm measuring capacitor C1 and the capacitance value of the low-voltage arm measuring capacitor C2 have a fixed proportional relationship,
A signal acquisition unit connected with the low-voltage arm measurement capacitor C2 to acquire and preprocess the voltage signal input by the low-voltage arm measurement capacitor C2 to obtain voltage data,
And the data processing and displaying unit is connected with the signal acquisition unit to receive the voltage data at the two ends of the low-voltage arm measurement capacitor C2, and determine the arc voltage at the two ends of the fracture of the switch contact to be tested according to the proportional relation, so that waveform reconstruction and display are realized.
In the preferred embodiment of the switching arc voltage measuring device, the switching arc voltage measuring device further comprises a power supply unit which is electrically connected with the signal acquisition unit and the data processing unit and used for providing working voltage, and the power supply unit comprises an external power supply module and an internal self-power-taking power supply module.
In a preferred embodiment of the switching arc voltage measuring device, the external power supply module includes a mains supply, a switching power supply or a battery pack, and the internal self-powered power supply module includes an induction power taking unit.
In the preferred embodiment of the switching arc voltage measuring device, the high voltage arm measuring capacitor C1 and the low voltage arm measuring capacitor C2 are space coupling capacitors with fixed volume values, which are formed by metal electrodes and current-carrying conductors.
In a preferred embodiment of the switching arc voltage measuring device, the space coupling capacitor comprises a metal electrode, an electrode substrate, an insulating medium and a current carrying conductor.
In a preferred embodiment of the switching arc voltage measuring device, the insulating medium is a medium made of nylon or rubber, and the current-carrying conductor is a conductor made of copper or aluminum.
In the preferred embodiment of the switching arc voltage measuring device, the metal electrode is in contact with an insulating medium in a fully-closed or partially-closed mode, the insulating medium is partially covered on the surface of the current-carrying conductor, and the electrode substrate is a protective substrate covered on the bottom surface of the metal electrode.
In a preferred embodiment of the switching arc voltage measuring device, the space coupling capacitor is a symmetrical structure symmetrical to the current-carrying conductor.
In a preferred embodiment of the switching arc voltage measuring device, the signal acquisition unit includes,
The input end of the isolation sampling module is directly connected with the low-voltage arm measuring capacitor C2 to perform isolation sampling processing on the voltage signal,
The input end of the filtering module is directly connected with the output end of the isolation sampling module to carry out filtering processing on the acquired voltage signals,
And the input end of the amplifying module is directly connected with the output end of the filtering module so as to amplify the voltage signal after the filtering processing.
In one embodiment, the data processing unit includes an oscilloscope and an upper computer.
In one embodiment, the switching arc voltage measuring device comprises a measuring capacitor unit, a signal acquisition unit, a data processing and displaying unit and a power supply unit; as shown in fig. 1, the measurement capacitor unit includes two groups of measurement capacitors for voltage division, which are respectively a high-voltage arm measurement capacitor C1 and a low-voltage arm measurement capacitor C2, which are respectively connected with outgoing lines on the high-voltage side and the low-voltage side of the fracture of the switch contact to be tested, wherein the high-voltage arm measurement capacitor C1 and the low-voltage arm measurement capacitor C2 are connected in series and then connected at two ends of the fracture of the switch contact to be tested;
The signal acquisition unit is directly connected with the low-voltage arm measurement capacitor C2, and correspondingly acquires and pre-processes the voltage signal input by the low-voltage arm measurement capacitor C2 so as to meet the requirement of further processing of subsequent data;
the data processing and displaying unit is directly connected with the signal acquisition unit and is used for receiving the voltage data of the two ends of the low-voltage arm measurement capacitor C2 after acquisition and preprocessing and determining the arc voltage of the two ends of the break of the switch to be detected according to the relation of the partial pressure of the capacitor;
the power supply unit is used for providing working voltage for the measuring device and is electrically connected with the signal acquisition unit and the data processing unit.
A fixed proportional relationship exists between capacitance values of the high-voltage arm measurement capacitor C1 and the low-voltage arm measurement capacitor C2, and the high-voltage arm measurement capacitor C1 and the low-voltage arm measurement capacitor C2 can be standard capacitors made of any materials with fixed capacitance values; the space coupling capacitor with fixed volume value formed by the metal electrode and the current-carrying conductor can also be used, as shown in the schematic section of the coupling capacitor in fig. 2. FIG. 4 is a schematic circuit diagram of a measurement capacitance unit of the measurement device of the present invention, wherein R1 and L1 are stray resistances and stray inductances of copper bars on the switchgear; r2 and L2 are stray resistance and stray inductance of the copper bar under the switch equipment.
The space coupling type capacitor comprises a metal electrode, an electrode substrate, an insulating medium and a current-carrying conductor. Wherein the insulating medium is made of nylon, rubber and other arbitrary materials and has arbitrary thickness; the current-carrying conductor is made of any metal material such as copper, aluminum and the like and has any cross-sectional shape; the metal electrode is in contact with the insulating medium in a fully-closed or partially-closed mode; the insulating medium covers the surface of the current-carrying conductor in a certain area; the electrode substrate is a protective substrate covered on the bottom surface of the metal electrode, and can be made of any material with a protective function;
The signal acquisition unit further comprises: the device comprises an isolation sampling module, a filtering module and an amplifying module;
The data processing unit comprises an oscilloscope and an upper computer.
The power supply unit comprises an external power supply module such as a mains supply, a switching power supply and a battery pack, and also comprises an internal self-power supply module such as induction power supply;
The input end of the isolation sampling module is directly connected with the low-voltage arm measurement capacitor C2 and is used for performing isolation sampling processing on a voltage signal input by the low-voltage arm measurement capacitor C2;
The input end of the filtering module is directly connected with the output end of the isolation sampling module and is used for filtering the acquired voltage signals and eliminating interference and burrs in the signals;
the input end of the amplifying module is directly connected with the output end of the filtering module, and the amplifying module is used for properly amplifying the voltage signal after filtering processing, so that the further processing of the subsequent data is facilitated.
The measuring method of the switching arc voltage measuring device comprises the following steps,
Step S1: switching the switching arc voltage measuring device into two ends of a movable contact and a fixed contact of the switching equipment, wherein the break voltage is U;
Step S2: when the switching device is switched on, the break voltage U is 0;
Step S3: when switching equipment starts to switch off, an arc is generated between moving and static contacts of the switching equipment, a fracture voltage U is equal to an arc voltage, the arc length is stretched along with the continuous increase of the distance between the moving and static contacts, the arc voltage is gradually increased, the arc voltage is kept constant after entering a stable arcing stage, in the process, a measuring capacitor unit bears a transient arc voltage with a high-frequency change amplitude, and according to the proportional relation between a measuring capacitor of a high-voltage arm and a measuring capacitor of a low-voltage arm, a dynamically-changed arc voltage signal is led out proportionally and is sent to a signal acquisition unit at the rear end;
Step S4: the signal acquisition unit is directly connected with the low-voltage arm measurement capacitor C2, and acquires and pre-processes voltage signals of partial voltage of arc voltage born by two ends of the low-voltage arm measurement capacitor C2 to obtain voltage data;
Step S5: the data processing and displaying unit is directly connected with the signal collecting unit and is used for receiving the voltage data at two ends of the low-voltage arm measuring capacitor C2 after collection and pretreatment, determining arc voltage at two ends of a fracture of the switch equipment to be tested according to the proportional relation between the high-voltage arm measuring capacitor C1 and the low-voltage arm measuring capacitor C2, and realizing arc voltage waveform reconstruction and display;
Step S6: when the switching equipment is switched off, after the electric arc is extinguished, the voltage at two ends of a fracture of the switching equipment is equal to the system voltage, and at the moment, the measuring capacitor unit directly bears the system high voltage and shows fracture characteristics without affecting the normal operation of the switching equipment.
FIG. 4 is a schematic circuit diagram of a measurement capacitance unit of the measurement device of the present invention, wherein R1 and L1 are stray resistances and stray inductances of copper bars on the switchgear; r2 and L2 are stray resistance and stray inductance of the copper bar under the switch equipment.
Fig. 5 (a) to 5 (c) are schematic diagrams of results of one measurement embodiment based on the measuring device of the present invention. Wherein, fig. 5 (a) is the voltage division output measured by the measurement capacitance unit; FIG. 5 (b) is the measured arc voltage of the voltage probe; fig. 5 (c) is a waveform comparison diagram of both in the same coordinate system.
As shown in fig. 5 (a) to 5 (c), it can be seen that the integral trend characteristics of the capacitive voltage division output and the actual arc voltage are almost identical, the measuring device realizes a good voltage division effect, and the arc voltages at two ends of the fracture of the switch contact to be measured can be determined according to the relation of capacitive series voltage division, so that waveform reconstruction and display are realized. All the data come from the same breaking process of the same breaker prototype.
The basic principles of the present application have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (10)
1. A switching arc voltage measuring device is characterized in that the device comprises,
The measuring capacitor unit comprises a high-voltage arm measuring capacitor C1 and a low-voltage arm measuring capacitor C2, wherein the high-voltage arm measuring capacitor C1 and the low-voltage arm measuring capacitor C2 are connected in series and then are connected with two ends of a contact fracture of a switch to be measured in parallel, the capacitance value of the high-voltage arm measuring capacitor C1 and the capacitance value of the low-voltage arm measuring capacitor C2 have a fixed proportional relationship,
A signal acquisition unit connected with the low-voltage arm measurement capacitor C2 to acquire and preprocess the voltage signal input by the low-voltage arm measurement capacitor C2 to obtain voltage data,
And the data processing and displaying unit is connected with the signal acquisition unit to receive the voltage data at the two ends of the low-voltage arm measurement capacitor C2, and determine the arc voltage at the two ends of the fracture of the switch contact to be tested according to the proportional relation, so that waveform reconstruction and display are realized.
2. The switching arc voltage measuring device according to claim 1, further comprising a power supply unit for providing an operating voltage electrically connecting the signal acquisition unit and the data processing unit, wherein the power supply unit comprises an external power supply module and an internal self-powered power supply module.
3. The switching arc voltage measurement device of claim 2 wherein the external power module comprises a mains power supply, a switching power supply, or a battery pack, and the internal self-powered power module comprises an inductive power take-off unit.
4. The switching arc voltage measuring apparatus according to claim 1, wherein the high voltage arm measuring capacitor C1 and the low voltage arm measuring capacitor C2 are each a space coupling type capacitor having a fixed volume value formed by a metal electrode and a current carrying conductor.
5. The switching arc voltage measurement device of claim 4, wherein the spatially coupled capacitor comprises a metal electrode, an electrode substrate, an insulating medium, and a current carrying conductor.
6. The switching arc voltage measurement device of claim 5 wherein the dielectric medium is a nylon or rubber medium and the current carrying conductor is a copper or aluminum conductor.
7. The switching arc voltage measuring device of claim 5 wherein the metal electrode is in contact with an insulating medium in a fully or partially enclosed form, the insulating medium partially covering the surface of the current carrying conductor, and the electrode substrate is a protective substrate covering the bottom surface of the metal electrode.
8. The switching arc voltage measurement device of claim 5 wherein the spatially coupled capacitor is of symmetrical construction with respect to the current carrying conductor.
9. The switching arc voltage measuring apparatus of claim 1 wherein the signal acquisition unit comprises,
The input end of the isolation sampling module is directly connected with the low-voltage arm measuring capacitor C2 to perform isolation sampling processing on the voltage signal,
The input end of the filtering module is directly connected with the output end of the isolation sampling module to carry out filtering processing on the acquired voltage signals,
And the input end of the amplifying module is directly connected with the output end of the filtering module so as to amplify the voltage signal after the filtering processing.
10. The method for measuring a switching arc voltage measuring device according to any one of claims 1 to 9, comprising the steps of,
Step Sl: switching the switching arc voltage measuring device into two ends of a movable contact and a fixed contact of the switching equipment, wherein the break voltage is U;
Step S2: when the switching device is switched on, the break voltage U is 0;
Step S3: when switching equipment starts to switch off, an arc is generated between moving and static contacts of the switching equipment, a fracture voltage U is equal to an arc voltage, the arc length is stretched along with the continuous increase of the distance between the moving and static contacts, the arc voltage is gradually increased, the arc voltage is kept constant after entering a stable arcing stage, in the process, a measuring capacitor unit bears a transient arc voltage with a high-frequency change amplitude, and according to the proportional relation between a measuring capacitor of a high-voltage arm and a measuring capacitor of a low-voltage arm, a dynamically-changed arc voltage signal is led out proportionally and is sent to a signal acquisition unit at the rear end;
Step S4: the signal acquisition unit is directly connected with the low-voltage arm measurement capacitor C2, and acquires and pre-processes voltage signals of partial voltage of arc voltage born by two ends of the low-voltage arm measurement capacitor C2 to obtain voltage data;
Step S5: the data processing and displaying unit is directly connected with the signal collecting unit and is used for receiving the voltage data at two ends of the low-voltage arm measuring capacitor C2 after collection and pretreatment, determining arc voltage at two ends of a fracture of the switch equipment to be tested according to the proportional relation between the high-voltage arm measuring capacitor Cl and the low-voltage arm measuring capacitor C2, and realizing arc voltage waveform reconstruction and display;
Step S6: when the switching equipment is switched off, after the electric arc is extinguished, the voltage at two ends of a fracture of the switching equipment is equal to the system voltage, and at the moment, the measuring capacitor unit directly bears the system high voltage and shows fracture characteristics without affecting the normal operation of the switching equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311785579.2A CN117907658A (en) | 2023-12-22 | 2023-12-22 | Switch arc voltage measuring device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311785579.2A CN117907658A (en) | 2023-12-22 | 2023-12-22 | Switch arc voltage measuring device and method |
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| CN117907658A true CN117907658A (en) | 2024-04-19 |
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| CN202311785579.2A Pending CN117907658A (en) | 2023-12-22 | 2023-12-22 | Switch arc voltage measuring device and method |
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