CN112285496A - Quantitative method and system for partial discharge of high-voltage electrical equipment - Google Patents
Quantitative method and system for partial discharge of high-voltage electrical equipment Download PDFInfo
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- CN112285496A CN112285496A CN202011000917.3A CN202011000917A CN112285496A CN 112285496 A CN112285496 A CN 112285496A CN 202011000917 A CN202011000917 A CN 202011000917A CN 112285496 A CN112285496 A CN 112285496A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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Abstract
The invention discloses a quantitative method and a quantitative system for partial discharge of high-voltage electrical equipment, and belongs to the technical field of electrical equipment insulation tests. The method comprises the following steps: acquiring the duration of partial discharge of the electrical equipment, an external voltage instantaneous value and a pulse current signal; aiming at the pulse current signal, coupling the pulse current signal to obtain a pulse voltage signal and the discharge times of the pulse voltage signal, and performing integral operation on the pulse voltage signal to obtain the area of the pulse voltage; determining the apparent charge quantity according to the resistance value of the standard resistor aiming at the area of the pulse voltage; determining an average discharge current according to the apparent charge amount of partial discharge, the discharge duration and the discharge times of the pulse voltage signal; and calculating to obtain the discharge power according to the average discharge current and the instantaneous value of the applied voltage, and completing the quantification of the partial discharge of the high-voltage electrical equipment. The invention adopts the discharge power as the core parameter for calibrating and measuring the measuring loop.
Description
Technical Field
The invention relates to the technical field of insulation tests of electrical equipment, in particular to a quantitative method and a quantitative system for partial discharge of high-voltage electrical equipment.
Background
Partial discharges can lead to dielectric breakdown, but for high-voltage electrical equipment it is not practical or economical to completely avoid partial discharges. In actual work, the partial discharge level needs to be accurately measured, and the degree and the trend of insulation degradation are judged by measuring related parameters of partial discharge, so that the safe operation of high-voltage electrical equipment is ensured.
Partial discharge measurement is one of important means for judging insulation degradation of high-voltage electrical equipment, and partial discharge measurement techniques include an electrical measurement method (i.e., a pulse current method), an acoustic method, an electromagnetic field measurement method, an optical method, a chemical method, and the like. The electrical measurement method can obtain various parameters such as apparent discharge amount, discharge repetition filtering, pulse duration and the like through a measurement loop, and further analyze and calculate.
It is one of the international and domestic research focuses to use which kind of characteristic parameters as the index for evaluating partial discharge and then accurately evaluate the degree and trend of insulation degradation. In the electrical measurement method, the actual amount of discharge charge generated by partial discharge cannot be measured, and the apparent charge amount and other related parameters can be indirectly measured, but the apparent charge amount has some correlation with insulation degradation, but the degree of insulation degradation cannot be directly corresponded to. There is therefore a risk of evaluating the insulation degradation of high-voltage electrical equipment by the apparent charge amount of partial discharges.
For the partial discharge measurement of high-voltage electrical equipment, a series of related parameter influences including apparent charge quantity and the correlation with the insulation degradation degree need to be considered, and the insulation level is accurately evaluated by adopting a proper quantitative method.
Disclosure of Invention
In order to solve the above problems, the present invention provides a quantitative method for partial discharge of high-voltage electrical equipment, comprising:
aiming at the partial discharge of the electrical equipment, a calibration pulse generator is used for calibrating a partial discharge test loop and then measuring to obtain the discharge duration of the electrical equipment, an external voltage instantaneous value and a pulse current signal;
aiming at the pulse current signal, coupling the pulse current signal to obtain a pulse voltage signal and the discharge times of the pulse voltage signal, and performing integral operation on the pulse voltage signal to obtain the area of the pulse voltage;
determining the apparent charge quantity according to the resistance value of the standard resistor aiming at the area of the pulse voltage;
determining an average discharge current according to the apparent charge amount and duration of partial discharge and the discharge times of the pulse voltage signal;
and calculating to obtain the discharge power according to the average discharge current and the instantaneous value of the applied voltage, and completing the quantification of the partial discharge of the high-voltage electrical equipment.
Optionally, the discharge power is used for evaluating insulation degradation of the high-voltage electrical equipment.
Optionally, the pulse current signal is an instantaneous voltage generated across the electrical device, and the instantaneous voltage is coupled to the detection impedance through the coupling capacitor to generate the pulse current.
The invention relates to a quantitative system for partial discharge of high-voltage electrical equipment, which comprises:
the acquisition module is used for measuring the partial discharge test loop after calibrating the partial discharge test loop by using the calibration pulse generator aiming at the partial discharge of the electrical equipment, and acquiring the discharge duration of the electrical equipment, an external voltage instantaneous value and a pulse current signal;
the first calculation module is used for coupling the pulse current signal to obtain a pulse voltage signal and the discharge times of the pulse voltage signal and carrying out integral operation on the pulse voltage signal to obtain the pulse voltage area;
the second calculation module determines the apparent charge amount according to the standard resistance value aiming at the pulse voltage area;
the third calculation module determines average discharge current according to the apparent charge quantity and the duration of partial discharge and the discharge times of the pulse voltage signal;
and the quantitative module is used for calculating to obtain the discharge power according to the average discharge current and the instantaneous value of the applied voltage so as to quantify the partial discharge of the high-voltage electrical equipment.
Optionally, the quantitative module is used for evaluating insulation degradation of the electrical equipment.
Optionally, the pulse current signal is an instantaneous voltage generated across the electrical device, and the instantaneous voltage is coupled to the detection impedance through the coupling capacitor to generate the pulse current.
The method is different from the traditional partial discharge electrical measurement method which adopts apparent charges as core parameters for calibration and measurement of a measurement loop and adopts partial discharge power to quantify the partial discharge phenomenon;
the damage of partial discharge to insulation is directly related to actual discharge charge, and only apparent discharge charge is measured, but actual discharge charge is not.
The discharge power provided by the invention is taken as the comprehensive statistic of the discharge capacity, not only contains the apparent discharge capacity, but also contains abundant discharge information, and takes multidimensional parameters including the apparent charge quantity into consideration, so that the partial discharge quantification of the high-voltage electrical equipment is realized; in many cases, the discharge amount changes instantaneously and fluctuates irregularly, and the traditional method cannot necessarily represent the discharge amount of a long time before and after measurement when the apparent charge amount at each moment is measured;
the invention considers the partial discharge condition in the duration time T, the apparent charge quantity only reflects the discharge charge of the maximum defect, and can not reflect the discharge times and the discharge energy;
the invention is compatible with factors including discharge duration, discharge frequency and the like including apparent charge quantity, solves the problems of accelerated insulation degradation speed but insignificant apparent charge quantity, and improves the accuracy and the diagnosis effectiveness of partial discharge measurement by a pulse current method.
Drawings
FIG. 1 is a flow chart of a quantitative method for partial discharge of high voltage electrical equipment according to the present invention;
FIG. 2 is a partial discharge circuit structure diagram of a quantitative method for partial discharge of high voltage electrical equipment according to the present invention;
fig. 3 is a diagram of a quantitative system for partial discharge of high-voltage electrical equipment according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a quantitative method for partial discharge of high-voltage electrical equipment, as shown in figure 1, comprising the following steps:
aiming at the partial discharge of the electrical equipment, a calibration pulse generator is used for calibrating a partial discharge test loop and then measuring the partial discharge test loop to obtain the discharge duration of the electrical equipment, an external voltage instantaneous value and a pulse current signal;
aiming at the pulse current signal, coupling the pulse current signal to obtain a pulse voltage signal and the discharge times of the pulse voltage signal, and performing integral operation on the pulse voltage signal to obtain the area of the pulse voltage;
determining the apparent charge quantity according to the resistance value of the standard resistor aiming at the area of the pulse voltage;
determining an average discharge current according to the apparent charge amount and duration of partial discharge and the discharge times of the pulse voltage signal;
and calculating to obtain the discharge power according to the average discharge current and the instantaneous value of the applied voltage, and completing the quantification of the partial discharge of the high-voltage electrical equipment.
The discharge power is used for evaluating the insulation deterioration of the electrical equipment.
The pulse current signal is an instantaneous voltage generated at two ends of the electrical equipment, and the instantaneous voltage is coupled to the detection impedance through the coupling capacitor to generate pulse current.
With the wide application of electrical equipment such as power transformers, sleeves, cables, GIS and the like, if the electrical equipment has a partial discharge phenomenon under normal operation voltage, the local insulation quality defect is indicated, and if the electrical equipment is developed, insulation breakdown and damage can be caused, so that safety accidents are caused.
"partial discharge" is a phenomenon in which, under the action of an electric field, discharge occurs only in a partial region of an insulating medium of an electrical device without penetrating between conductors to which a voltage is applied, i.e., without breaking down, and this phenomenon is called partial discharge. The partial discharge phenomenon excites various physical quantities including a pulse current, an electromagnetic wave, an ultrasonic wave, an optical signal, a chemical decomposition product, and the like. Of these state variables, the pulse current method is suitable for quantifying the extent of partial discharges. The traditional local discharge pulse current method measurement technology is to measure the apparent charge q0The (apparent charge) is used as a core parameter to evaluate the insulation degradation condition of the electrical equipment, namely an impulse current method, namely an 'electrical measurement method'.
In practice, it is always desirable that the number of parameters to be measured is smaller and the measuring method is simpler and better, and therefore, it is necessary to study which characteristic parameter is most suitable as an index for evaluating the performance of the partial discharge, and the degree of insulation degradation can be most accurately evaluated by which characteristic of the partial discharge.
The invention is different from the traditional partial discharge electrical measurement method which adopts apparent charge q0As a core parameter for calibrating and measuring a measurement loop, the partial discharge power P is taken as a core parameter for quantifying partial discharge, and the partial discharge power P contains abundant discharge information, so that the insulation degradation degree of the electrical equipment can be represented more accurately, as shown in FIG. 1Finally, the partial discharge power p (discharge power) is used as a core parameter to evaluate the insulation deterioration condition of the electrical equipment.
The partial discharge test circuit is a test circuit for measuring partial discharge generated by insulation degradation of electrical equipment on site, and mainly comprises a test power supply S which is generally a 'no partial discharge test transformer', as shown in fig. 2; sample CxIs the "high voltage electrical equipment" being measured, such as power transformers, bushings, cables, GIS, etc.; coupling capacitor CkThe capacitor is a high-voltage test capacitor and is mainly used for shunting; detecting impedance ZdThe device is an accessory of a partial discharge measurement system, is an RC (resistance capacitance) type or RLC (radio link control) type impedance unit and is mainly used for converting a pulse current signal in a test loop into a pulse voltage signal so as to be convenient for the measurement of the partial discharge measurement system.
The pulse current method has the basic principle that: when a partial discharge occurs, the sample CxA momentary voltage change DeltaU is produced across the two terminals, e.g. via a coupling capacitor CkCoupled to a detection impedance ZdIn the above, a pulse current I is generated in the loop, and the pulse current I flows through the detection impedance to generate a pulse voltage, which is then collected, amplified, displayed and the like by the host of the partial discharge measurement system, so that some basic quantities of partial discharge can be measured. The pulsed current method mainly uses the lower frequency band part of the partial discharge spectrum, generally tens of Hz to hundreds of kHz.
The discharge power P is m times of discharge in the measuring time T, and the product of apparent discharge charge corresponding to each discharge and instantaneous value of applied voltage is | q1|·u1、|q2|·u2、……|qm|·umThen the discharge power is
The calculation of the discharge power depends on the accurate calculation of the average discharge current I, which is measured and calculated by a partial discharge measurement system, and also depends on the instantaneous value u of the applied voltagemIt is read by the booster and its voltage monitoring device, and the current partial discharge tester is not generally calculated and has no displayThe parameter of the discharge power P is shown.
The average discharge current I is the discharge occurring m times within the measurement time, the apparent discharge charge corresponding to each time being q1、q2、……qmAverage discharge current
Calculation of the average discharge current depends on the apparent charge q0The exact calculation of (d) also depends on the number of discharges m and the discharge duration T, which is measured and calculated by the partial discharge measurement system. At present, partial discharge testers generally do not calculate and do not display the parameter of average discharge current I.
Apparent charge q0The definition of (a) is "partial discharge for a given test loop, in a very short time, if the amount of charge injected across the test article causes a reading of the measurement instrument that is equivalent to the reading caused by the partial discharge pulse. The apparent amount of discharged charge, expressed in units of picocoulombs (pC), has two main measures: one is to inject transient known charges simulating actual discharge into two ends (two ends applying voltage) of an electrical device to be tested (also called a "test article"), and the pulse voltage appearing at the two ends is the same as the pulse voltage generated during partial discharge, so that the injected charge amount is the apparent discharge charge amount; the other is defined according to the charge, i.e., [ integral ] i (t) dt, which is the current flowing in a unit time, and since the coupling unit converts the pulse current into the pulse voltage, the [ integral ] i (t) dt can also be expressed as
The method depends on accurate measurement of pulse voltage area ^ u (t) dt and resistance and frequency spectrum characteristics of a standard resistor R, and the pulse voltage area is measured and calculated by a partial discharge measurement system and is directly displayed on a screen of a tester.
The pulse voltage area ^ u (t) dt is obtained by numerically integrating the pulse voltage output by the coupling unit through an oscilloscope instrument or a partial discharge measurement system with a certain bandwidth, and is obtained by calculating after integrating the pulse voltage in a period of time through a main machine part of the partial discharge measurement system, and an intermediate process parameter is not normally and directly displayed on a screen of a tester. The time domain curve of the pulse voltage is measured by a partial discharge measurement system, the time base required by the integral operation is provided by the partial discharge measurement system, the pulse voltage area is obtained by numerical integral calculation, and the accurate measurement of the pulse voltage area mainly depends on the accuracy of the pulse voltage u (t) peak value and the accuracy of the time base.
The pulse voltage u (t) is obtained by collecting the pulse current I (t) through the coupling unit, and is obtained by amplifying, filtering and signal processing of a host part of a partial discharge measurement system, an intermediate process parameter is not directly displayed on a screen of a tester generally, the accurate measurement of the pulse voltage u (t) depends on the circuit structure and element parameters of the coupling unit, the rise time of a pulse is smaller than the time constant of the coupling unit by more than 1 magnitude order, the coupling unit can be formed by RC type or LCR type impedance, and the main function of the coupling unit is to obtain a pulse current signal generated by partial discharge and inhibit the power frequency and harmonic noise of a booster. The coupling unit can be regarded as a sensing element of the partial discharge measurement system, and the input end of the coupling unit is a pulse current I (t) signal.
The pulse current I (t) is an electric signal of a parameter in a measuring loop when the electrical equipment is in partial discharge, and is obtained by a whole set of partial discharge measuring system according to the principle that a sample C is generated when partial discharge occurs oncexA momentary voltage change DeltaU is produced across the two terminals, e.g. via a coupling capacitor CkCoupled to a detection impedance ZdIn this way, a pulse current I is generated in the loop, and the accurate measurement of the pulse current I (t) depends on the circuit structure of the measurement loop and the electrical parameters of each module. It should be noted that the measurement of the partial discharge is not to directly measure the peak value or effective value of the current, but to measure multidimensional information characterized by the current, such as the apparent charge amount characterized by the area of the pulse current, and the partial discharge power characterized by the factors of discharge duration, discharge times and the like including the apparent charge amount through a function.
When the partial discharge measurement circuit generates a partial discharge, a transient voltage change is generated at two ends of the tested electrical equipment (also called a test article), and a current pulse is generated through the coupling capacitor and the impedance type coupling unit.
Under the action of the electric field, partial discharge occurs only in partial areas in the insulation of the electrical equipment, other insulation areas are not discharged, and the conductors applying voltage are not broken down. Since the electric field experienced by the insulator regions is generally non-uniform, the partial discharge is not continuous and uniform.
The operating field strength to which the insulation system of electrical equipment is subjected is increasing with increasing voltage levels, and it is uneconomical to require that the electrical equipment is completely free from partial discharges. The degree of insulation degradation is monitored through partial discharge quantitative measurement, and therefore safe and stable operation of equipment is guaranteed.
The invention relates to a quantitative system 200 for partial discharge of high-voltage electrical equipment, as shown in fig. 3, comprising:
the acquisition module 201 is used for measuring the partial discharge test loop after calibrating the partial discharge test loop by using the calibration pulse generator aiming at the partial discharge of the electrical equipment, and acquiring the discharge duration of the electrical equipment, an external voltage instantaneous value and a pulse current signal;
the first calculation module 202 is configured to couple the pulse current signal to obtain a pulse voltage signal and the discharge frequency of the pulse voltage signal, and perform an integration operation on the pulse voltage signal to obtain a pulse voltage area;
the second calculation module 203 determines the apparent charge amount according to the standard resistance value aiming at the pulse voltage area;
a third calculation module 204 for determining an average discharge current according to the apparent charge amount, the duration and the discharge frequency of the pulse voltage signal;
and the quantitative module 205 calculates the discharge power according to the average discharge current and the instantaneous value of the applied voltage, so as to quantify the partial discharge of the high-voltage electrical equipment.
The quantitative module is used for evaluating the insulation degradation condition of the electrical equipment.
The pulse current signal is an instantaneous voltage generated at two ends of the electrical equipment, and the instantaneous voltage is coupled to the detection impedance through the coupling capacitor to generate pulse current.
The method is different from the traditional partial discharge electrical measurement method which adopts apparent charges as core parameters for calibration and measurement of a measurement loop;
the damage of partial discharge to insulation is directly related to actual discharge charge, and only apparent discharge charge is measured, but actual discharge charge is not.
The discharge power provided by the invention is taken as the comprehensive statistic of the discharge capacity, not only contains the apparent discharge capacity, but also contains abundant discharge information, and takes multidimensional parameters including the apparent charge quantity into consideration, so that the partial discharge quantification of the high-voltage electrical equipment is realized; in many cases, the discharge amount changes instantaneously and fluctuates irregularly, and the traditional method cannot necessarily represent the discharge amount of a long time before and after measurement when the apparent charge amount at each moment is measured;
the invention considers the partial discharge condition in the duration time T, the discharge amount only reflects the maximum discharge charge with one defect, and can not reflect the discharge times and the discharge energy;
the invention is compatible with the factors of discharge duration, discharge frequency and the like including the apparent charge quantity, and solves the problem that the insulation degradation speed is accelerated but the apparent charge quantity is not obvious.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (6)
1. A quantitative method for partial discharge of a high voltage electrical device, the method comprising:
aiming at the partial discharge of the electrical equipment, a calibration pulse generator is used for calibrating a partial discharge test loop and then measuring the partial discharge test loop to obtain the discharge duration of the electrical equipment, an external voltage instantaneous value and a pulse current signal;
aiming at the pulse current signal, coupling the pulse current signal to obtain a pulse voltage signal and the discharge times of the pulse voltage signal, and performing integral operation on the pulse voltage signal to obtain the area of the pulse voltage;
determining the apparent charge quantity according to the resistance value of the standard resistor aiming at the area of the pulse voltage;
determining an average discharge current according to the apparent charge amount and duration of partial discharge and the discharge times of the pulse voltage signal;
and calculating to obtain the discharge power according to the average discharge current and the instantaneous value of the applied voltage, and completing the quantification of the partial discharge of the high-voltage electrical equipment.
2. The method of claim 1, wherein the discharge power is used to evaluate an insulation degradation of an electrical device.
3. The method of claim 1, wherein the pulsed current signal is an instantaneous voltage generated across the electrical device, the instantaneous voltage coupled to the sensing impedance via a coupling capacitor to generate the pulsed current.
4. A dosing system for partial discharge of high voltage electrical equipment, the system comprising:
the acquisition module is used for measuring the partial discharge test loop after calibrating the partial discharge test loop by using the calibration pulse generator aiming at the partial discharge of the electrical equipment, and acquiring the discharge duration of the electrical equipment, an external voltage instantaneous value and a pulse current signal;
the first calculation module is used for coupling the pulse current signal to obtain a pulse voltage signal and the discharge times of the pulse voltage signal and carrying out integral operation on the pulse voltage signal to obtain the pulse voltage area;
the second calculation module determines the apparent charge amount according to the standard resistance value aiming at the pulse voltage area;
the third calculation module determines average discharge current according to the duration of the apparent charge quantity of the partial discharge and the discharge times of the pulse voltage signal;
and the quantitative module is used for calculating to obtain the discharge power according to the average discharge current and the instantaneous value of the applied voltage so as to quantify the partial discharge of the high-voltage electrical equipment.
5. The system of claim 5, wherein the quantification module is configured to evaluate an insulation degradation of the electrical device.
6. The system of claim 5, wherein the pulsed current signal is an instantaneous voltage generated across the electrical device, the instantaneous voltage coupled to the sensing impedance through a coupling capacitor, and the pulsed current formed in the measurement loop. The detection impedance converts the pulse current signal into a pulse voltage signal and outputs the pulse voltage signal to a host of the partial discharge measurement system.
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| CN114200257A (en) * | 2021-11-19 | 2022-03-18 | 山东电工配网科技发展有限公司 | Online monitor is put in ring net case office |
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| CN116298722A (en) * | 2023-02-07 | 2023-06-23 | 深圳新立图智能科技有限公司 | Aluminum electrolysis cell short-circuit port insulation on-line monitoring method and system based on partial discharge signals |
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