CN114487739A - Interference signal suppression device and method for electrical equipment partial discharge pulse measurement - Google Patents
Interference signal suppression device and method for electrical equipment partial discharge pulse measurement Download PDFInfo
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- CN114487739A CN114487739A CN202210160492.5A CN202210160492A CN114487739A CN 114487739 A CN114487739 A CN 114487739A CN 202210160492 A CN202210160492 A CN 202210160492A CN 114487739 A CN114487739 A CN 114487739A
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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
- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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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
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Abstract
The invention relates to an interference signal suppression device and method for measuring partial discharge pulse of electrical equipment, which can suppress and eliminate interference signals during partial discharge test of high-voltage electrical equipment by hardware isolation, and the used components are simple and easy to obtain, the cost is lower, and no interference signals are generated; the wiring and the operation are simple, the test detection efficiency is improved, and the detection time is shortened; the signal source can be automatically determined according to the circuit principle without distinguishing whether the detected signal is from the outside or the inside of the tested object, and the effect of removing the interference signal is obvious; meanwhile, the partial discharge signal after the interference is eliminated can be amplified, so that the subsequent signal observation is facilitated.
Description
Technical Field
The invention relates to an interference signal suppression device and an interference signal suppression method for measuring partial discharge pulses of electrical equipment.
Background
Partial discharge detection is a main means for evaluating the insulation condition of electrical equipment, but some difficulties exist in practical application, mainly that interference in various aspects is strong during field detection, and partial discharge signals are difficult to accurately detect. Therefore, in the partial discharge detection process of the power equipment, the information of the partial discharge of the electrical equipment can be effectively obtained only by suppressing and shielding the interference signal to the maximum extent, and the method is very important for evaluating the insulation condition of the electrical equipment.
For various interference signals in partial discharge detection, the existing methods for suppressing the interference signals mainly use hardware isolation or perform digital filtering processing on the signals. The hardware isolation multipurpose isolation transformer, the test area increase electromagnetic shielding and other methods, the use of the isolation transformer can increase the test cost, the general environment of the test field is complex, and complete electromagnetic shielding cannot be achieved. The interference suppression method of digital filtering processing is mainly applied to the long-time partial discharge online monitoring of equipment, a large amount of electrical equipment operation data needs to be continuously collected and used as original data to perform algorithm training, so that a relatively accurate interference suppression effect can be achieved, a large number of computer resources are consumed in the process, if the operation conditions of the electrical equipment are changed, the algorithm accuracy is remarkably reduced, algorithm training needs to be performed again, and time and resources are consumed.
The patent application with publication number CN102565645A, entitled "anti-interference on-line monitoring method for partial discharge of generator", proposes to install sensors at the near end and the far end of the generator to be tested, and to distinguish interference signals and partial discharge signals by calculating the time delay Δ t of two signals. In the patent application CN111458616A, the patent application "a device and a method for improving the signal-to-noise ratio of common mode interference suppression partial discharge" uses a rogowski coil to cancel the partial discharge signal in the external environment in the rogowski coil so as to suppress the interference signal, but when the rogowski coil is used to measure a non-sinusoidal current or an unknown frequency current, an integrator needs to be configured to improve the accuracy, which increases the extra workload and cost. Therefore, improvement and innovation thereof are imperative.
Disclosure of Invention
In view of the above situation, to overcome the defects of the prior art, the present invention provides an interference signal suppression apparatus and method for measuring partial discharge pulse of electrical equipment, which can effectively solve the problem of suppressing and eliminating interference signals during partial discharge test of high-voltage electrical equipment through hardware isolation.
The technical scheme of the invention is as follows:
an interference signal suppression device for partial discharge pulse measurement of electrical equipment comprises a three-phase power supply, a frequency converter, a step-up transformer and tested equipment CxAdjustable coupling capacitor CkAnd partial discharge detection device, the device also comprises an interference signal eliminating device based on a differential operational amplifier, a three-phase power supply is connected with a frequency converter, the frequency converter is connected with a step-up transformer, and a terminal of the step-up transformer is connected with a tested device CxHigh-voltage side and adjustable coupling capacitor CkThe high-pressure sides are connected in parallel;
the interference signal eliminating device comprises a shell, a differential operational amplifier, adjustable resistors R5 and R6, adjustable capacitors C1 and C2, resistors R1, R2, R3 and R4, wherein the differential operational amplifier, the adjustable resistors R5 and R6, the adjustable capacitors C1 and C2, the resistors R1, R2, R3 and R4 are arranged in the shell, the negative input end of the differential operational amplifier is used as a voltage input end and is respectively connected with one end of the resistor R1 and one end of the resistor R3, the other end of the R1 is respectively connected with one end of the adjustable resistor R5 and one end of the adjustable capacitor C1, and the common end of the differential operational amplifier is used as the interference signal eliminating deviceFirst signal input connecting terminal and adjustable coupling capacitor CkThe positive input end of the differential operational amplifier is used as the other voltage input end and is respectively connected with one end of a resistor R2 and one end of a resistor R4, the other end of a resistor R2 is respectively connected with one end of an adjustable resistor R6 and one end of an adjustable capacitor C2, and the common end of the positive input end of the differential operational amplifier and the second signal input connecting terminal of the interference signal eliminating device is used as the second signal input connecting terminal of the interference signal eliminating device and the tested equipment CxThe other end of the adjustable resistor R5 is respectively connected with the other end of the adjustable capacitor C1, the other end of the adjustable resistor R6 and the other end of the adjustable capacitor C2, the common end of the adjustable resistor R5 is used as a third signal input wiring terminal of the interference signal eliminating device to be grounded, the other end of the resistor R3 is connected with the output end of the differential operational amplifier, the common end of the adjustable resistor R1 and the other end of the resistor R4 are respectively used as two output ends of the interference signal eliminating device to be connected with the partial discharge detection device, wherein:
the three-phase power supply is used for providing power for detecting partial discharge of the electrical equipment;
the frequency converter is used for adjusting the frequency and amplitude of an input power supply;
the interference signal eliminating device is used for eliminating the interference signal flowing through the tested equipment CxAnd a coupling capacitor CkSampling and eliminating interference signals to reserve partial discharge signals;
the partial discharge detection device is used for receiving and displaying the partial discharge signals processed by the interference signal elimination device;
the parallel connection part of the adjustable resistor R5 and the adjustable capacitor C1 is used as a first detection impedance Zm1The parallel connection part of the adjustable resistor R6 and the adjustable capacitor C2 is used as a second detection impedance Zm2；
If the interfered signal comes from the outside, the first detection impedance Zm1And a second detection impedance Zm2The upper potentials are equal in size and have the same polarity, and the voltage U at the two signal input ends of the differential operational amplification circuitin1、Uin2Also of equal magnitude and of the same polarity, output signals
If the tested object generates real local amplifying signalFirst detection impedance Zm1And a second detection impedance Zm2The upper potentials are equal in size and opposite in polarity, and the voltages U of the two signal input ends of the differential operational amplification circuitin1、Uin2Equal in magnitude and opposite in polarity, and output end signal
An interference signal suppression method based on the interference signal suppression device comprises the following steps:
step one, wiring
The three-phase power supply is connected with a frequency converter, the frequency converter is connected with a step-up transformer, and a terminal of the step-up transformer is connected with a tested device CxHigh-voltage side and adjustable coupling capacitor CkHigh-voltage side parallel connection and adjustable coupling capacitor CkThe low-voltage side is connected with a first signal input connecting terminal of the interference signal eliminating device, and the tested equipment CxThe low-voltage side is connected with a second signal input wiring terminal of the interference signal eliminating device, a third signal input wiring terminal of the interference signal eliminating device is grounded, and two output ends of the interference signal eliminating device are connected with the partial discharge detection device;
step two, adjusting parameters
Measurement of device under test CxAssuming that the capacitance of the tested object is x F, the adjustable coupling capacitor C is adjustedkThe capacitance of the adjustable resistor R5 and the capacitance of the adjustable capacitor R6 are equal, and then the values of the adjustable resistor R5 and the adjustable capacitor C1 and the adjustable capacitor C2 are adjusted, specifically:
the capacitance of the adjustable capacitors C1 and C2 is adjusted to 0.5x F;
the resistance values of the adjustable resistors R5 and R6 are adjusted to
Step three, collecting partial discharge signals
And (3) switching on a power supply, adjusting the frequency converter to change the voltage and the frequency at two ends of the tested equipment, reading a partial discharge signal on the partial discharge detection device after the test voltage is reached, and thus obtaining the partial discharge signal with the external interference signal filtered out.
Compared with the prior art, the invention has the following advantages:
1) the interference signal during the partial discharge test of the high-voltage electrical equipment is inhibited and eliminated through hardware isolation, the used components are simple and easy to obtain, the cost is low, and the self interference-free signal is generated;
2) the wiring and the operation are simple, the test detection efficiency is improved, and the detection time is shortened;
3) the signal source can be automatically determined according to the circuit principle without distinguishing whether the detected signal is from the outside or the inside of the tested object, and the effect of removing the interference signal is obvious;
4) meanwhile, the partial discharge signal after the interference is eliminated can be amplified, so that the subsequent signal observation is facilitated.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Fig. 2 is a schematic circuit diagram of an interference signal removing apparatus according to the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in figures 1-2, the interference signal suppression device for measuring partial discharge pulse of electrical equipment comprises a three-phase power supply, a frequency converter, a step-up transformer and tested equipment CxAdjustable coupling capacitor CkAnd partial discharge detection device, the device also comprises an interference signal eliminating device based on a differential operational amplifier, a three-phase power supply is connected with a frequency converter, the frequency converter is connected with a step-up transformer, and a terminal of the step-up transformer is connected with a tested device CxHigh voltage side and adjustable coupling capacitor CkThe high-pressure sides are connected in parallel;
the interference signal eliminating device comprises a shell, a differential operational amplifier, adjustable resistors R5 and R6, adjustable capacitors C1 and C2, resistors R1, R2, R3 and R4, wherein the differential operational amplifier, the adjustable resistors R5 and R6, the adjustable capacitors C1 and C2, the resistors R1, R2, R3 and R4 are arranged in the shell, the negative input end of the differential operational amplifier is used as a voltage input end and is respectively connected with one end of the resistor R1 and one end of the resistor R3, the other end of the R1 is respectively connected with one end of the adjustable resistor R5 and one end of the adjustable capacitor C1, and the common end of the R1 is used as a trunkFirst signal input wiring terminal and adjustable coupling capacitor C of interference signal eliminating devicekThe positive input end of the differential operational amplifier is used as the other voltage input end and is respectively connected with one end of a resistor R2 and one end of a resistor R4, the other end of a resistor R2 is respectively connected with one end of an adjustable resistor R6 and one end of an adjustable capacitor C2, and the common end of the positive input end of the differential operational amplifier and the second signal input connecting terminal of the interference signal eliminating device is used as the second signal input connecting terminal of the interference signal eliminating device and the tested equipment CxThe other end of the adjustable resistor R5 is respectively connected with the other end of the adjustable capacitor C1, the other end of the adjustable resistor R6 and the other end of the adjustable capacitor C2, the common end of the adjustable resistor R5 is used as a third signal input wiring terminal of the interference signal eliminating device to be grounded, the other end of the resistor R3 is connected with the output end of the differential operational amplifier, the common end of the adjustable resistor R1 and the other end of the resistor R4 are respectively used as two output ends of the interference signal eliminating device to be connected with the partial discharge detection device, wherein:
the three-phase power supply is used for providing power for detecting partial discharge of the electrical equipment;
the frequency converter is used for adjusting the frequency and amplitude of an input power supply;
the interference signal eliminating device is used for eliminating the interference signal flowing through the tested equipment CxAnd a coupling capacitor CkSampling and eliminating interference signals to reserve partial discharge signals;
the partial discharge detection device is used for receiving and displaying the partial discharge signals processed by the interference signal elimination device;
the parallel connection part of the adjustable resistor R5 and the adjustable capacitor C1 is used as a first detection impedance Zm1The parallel connection part of the adjustable resistor R6 and the adjustable capacitor C2 is used as a second detection impedance Zm2；
The interference signal eliminator includes signal sampling part, interference signal eliminating part, partial discharge signal amplifying part and the first detecting impedance Zm1And a second detection impedance Zm2The parallel connection part forms a signal sampling part, and the differential operational amplifier forms an interference signal elimination and partial discharge signal amplification part;
the differential operational amplifier is generally used in an integrated circuit, is usually used for amplifying an analog signal and inhibiting zero drift of an analog electronic component, is not used for eliminating an interference signal in a high-voltage electrical test, the interference signal is transmitted into a discharge detection system after passing through a tested object from the external flow of the tested object, while a real partial discharge signal of an electrical device is generated by the internal insulation degradation of the electrical device, and then is amplified and detected by the partial discharge detection system after being detected by a detection impedance; the invention inhibits and eliminates the interference signal of the high-voltage electrical equipment during routine test by a hardware isolation method.
If the interfered signal comes from the outside, the first detection impedance Zm1And a second detection impedance Zm2The upper potentials are equal in size and have the same polarity, and the voltage U at the two signal input ends of the differential operational amplification circuitin1、Uin2Also has the same size and polarity, and the output end signal can be known according to the operational characteristics of the differential amplifier circuit
If a real partial discharge signal is generated in the tested object, the first detection impedance Zm1And a second detection impedance Zm2The upper potentials are equal in size and opposite in polarity, and the voltages U of the two signal input ends of the differential operational amplification circuitin1、Uin2The output end signals are equal in size and opposite in polarity and can be known according to the operational characteristics of the differential amplifier circuit
The casing of the interference signal eliminating device is a magnetic conductive metal casing and is used for electromagnetic shielding.
An interference signal suppression method based on the interference signal suppression device comprises the following steps:
step one, wiring
The three-phase power supply is connected with a frequency converter, the frequency converter is connected with a step-up transformer, and a terminal of the step-up transformer is connected with a tested device CxHigh-voltage side and adjustable coupling capacitor CkHigh-voltage side parallel connection and adjustable coupling capacitor CkThe low-voltage side is connected with a first signal input connecting terminal of the interference signal eliminating device, and the tested equipment CxLow voltage side and interference signal cancellationA second signal input connecting terminal of the device is connected, a third signal input connecting terminal of the interference signal eliminating device is grounded, and two output ends of the interference signal eliminating device are connected with the partial discharge detection device;
step two, adjusting parameters
Measurement of device under test CxAssuming that the capacitance of the tested object is x F, the adjustable coupling capacitor C is adjustedkThe capacitance of the adjustable resistor R5 and the capacitance of the adjustable capacitor R6 are equal, and then the values of the adjustable resistor R5 and the adjustable capacitor C1 and the adjustable capacitor C2 are adjusted, specifically:
the capacitance of the adjustable capacitors C1 and C2 is adjusted to 0.5x F;
the resistance values of the adjustable resistors R5 and R6 are adjusted to
The principle of the adjustable resistance calculation is that the adjustable resistance is calculated according to a calculation formula
Beta is a constant, and is generally 2.5 multiplied by 10 according to requirements5In the formula, Rm is R5 or R6 in the schematic diagram of the invention, Cm is C1 or C2 in the schematic diagram of the invention, and the values of the adjustable resistors R5 and R6 can be obtained
In this example, when the capacitance of the sample is 0.5 μ F, C1 ═ C2 ═ 0.25 μ F, and R5 ═ R6 ═ 8 Ω
Step three, collecting partial discharge signals
And (3) switching on a power supply, adjusting the frequency converter to change the voltage and the frequency at two ends of the tested equipment, reading a partial discharge signal on the partial discharge detection device after the test voltage is reached, and thus obtaining the partial discharge signal with the external interference signal filtered out.
The partial discharge signal is a series of pulse signals which are periodically changed and have fixed phases, interference signals from the outside are filtered, the remaining signals are the partial discharge signals of the electrical equipment after being amplified by 3-5 times, and workers can identify the type of partial discharge in the electrical equipment according to the extracted discharge pulse waveform.
The amplification factor of a differential operational amplifier in the interference signal eliminating device is 3-5 times.
In order to amplify the signal and keep the signal undistorted, the present embodiment selects the amplification factor to be 3 times, according to the formula of the amplification factor of the differential operational amplifier signal
Let R1 ═ R2 ═ 10k Ω, and R3 ═ R4 ═ 30k Ω.
The device and the method are verified by simulation electronic simulation software Multisim. And simultaneously applying an external interference signal and a real partial discharge signal, adding the external interference signal from the outside of the tested electrical equipment Cx, adding the real partial discharge signal from the inside of the tested article Cx, displaying a final processing signal by using an oscilloscope, amplifying the final partial discharge signal by 3 times, filtering the interference signal, and realizing the function of correspondingly filtering the interference amplification signal. The specific analog waveform is verified by selecting a square wave waveform and a spike wave waveform, and the specific data are shown in the following table.
TABLE 1 Impulse signal injection and the remaining after filtering
It can be known from the table that 8 groups of interference pulse signals with different frequencies, amplitudes and duty ratios and 2 groups of partial discharge pulse signals with determined frequencies, amplitudes and duty ratios are injected. Through simulation verification of analog electronic simulation software Multisim, 8 groups of interference signals are filtered, and 2 groups of partial discharge pulse signals are reserved and amplified.
Claims (4)
1. An interference signal suppression device for partial discharge pulse measurement of electrical equipment comprises a three-phase power supply, a frequency converter, a step-up transformer and tested equipment CxAdjustable coupling capacitor CkAnd a partial discharge detection device, characterized in that the deviceThe device also comprises an interference signal eliminating device based on a differential operational amplifier, wherein a three-phase power supply is connected with a frequency converter, the frequency converter is connected with a boosting transformer, and a terminal of the boosting transformer is connected with the tested equipment CxHigh-voltage side and adjustable coupling capacitor CkThe high-pressure sides are connected in parallel;
the interference signal eliminating device comprises a shell, a differential operational amplifier, adjustable resistors R5 and R6, adjustable capacitors C1 and C2, resistors R1, R2, R3 and R4, wherein the differential operational amplifier, the adjustable resistors R5 and R6, the adjustable capacitors C1 and C2, the resistors R1, R2, R3 and R4 are arranged in the shell, the negative input end of the differential operational amplifier is used as a voltage input end and is respectively connected with one end of the resistor R1 and one end of the resistor R3, the other end of the R1 is respectively connected with one end of the adjustable resistor R5 and one end of the adjustable capacitor C1, and the common end of the differential operational amplifier is used as a first signal input connecting terminal and an adjustable coupling capacitor C1 of the interference signal eliminating devicekThe positive input end of the differential operational amplifier is used as the other voltage input end and is respectively connected with one end of a resistor R2 and one end of a resistor R4, the other end of a resistor R2 is respectively connected with one end of an adjustable resistor R6 and one end of an adjustable capacitor C2, and the common end of the positive input end of the differential operational amplifier and the second signal input connecting terminal of the interference signal eliminating device is used as the second signal input connecting terminal of the interference signal eliminating device and the tested equipment CxThe other end of the adjustable resistor R5 is respectively connected with the other end of the adjustable capacitor C1, the other end of the adjustable resistor R6 and the other end of the adjustable capacitor C2, the common end of the adjustable resistor R5 is used as a third signal input wiring terminal of the interference signal eliminating device to be grounded, the other end of the resistor R3 is connected with the output end of the differential operational amplifier, the common end of the adjustable resistor R1 and the other end of the resistor R4 are respectively used as two output ends of the interference signal eliminating device to be connected with the partial discharge detection device, wherein:
the three-phase power supply is used for providing power for detecting partial discharge of the electrical equipment;
the frequency converter is used for adjusting the frequency and amplitude of an input power supply;
the interference signal eliminating device is used for eliminating the interference signal flowing through the tested equipment CxAnd a coupling capacitor CkSampling and eliminating interference signals to reserve partial discharge signals;
the partial discharge detection device is used for receiving and displaying the partial discharge signals processed by the interference signal elimination device;
part with adjustable resistor R5 and adjustable capacitor C1 connected in parallelDivided as a first detection impedance Zm1The parallel connection part of the adjustable resistor R6 and the adjustable capacitor C2 is used as a second detection impedance Zm2；
If the interfered signal is from the outside, the first detection impedance Zm1And a second detection impedance Zm2The upper potentials are equal in size and have the same polarity, and the voltage U at the two signal input ends of the differential operational amplification circuitin1、Uin2Also of equal magnitude and of the same polarity, output signals
If a real partial discharge signal is generated in the tested object, the first detection impedance Zm1And a second detection impedance Zm2The voltages at two signal input ends of the differential operational amplification circuit U are equal in magnitude and opposite in polarityin1、Uin2Equal in magnitude and opposite in polarity, and output end signal
2. The interference signal suppression device for electrical equipment partial discharge pulse measurement according to claim 1, wherein a casing of the interference signal elimination device is a magnetically conductive metal casing for electromagnetic shielding.
3. An interference signal suppression method based on the interference signal suppression device according to claim 1, comprising the steps of:
step one, wiring
The three-phase power supply is connected with a frequency converter, the frequency converter is connected with a step-up transformer, and a terminal of the step-up transformer is connected with a tested device CxHigh-voltage side and adjustable coupling capacitor CkHigh-voltage side parallel connection and adjustable coupling capacitor CkThe low-voltage side is connected with a first signal input connecting terminal of the interference signal eliminating device, and the tested equipment CxThe low-voltage side is connected with a second signal input wiring terminal of the interference signal eliminating deviceThe third signal input connecting terminal is grounded, and two output ends of the interference signal eliminating device are connected with the partial discharge detection device;
step two, adjusting parameters
Measurement of device under test CxAssuming that the capacitance of the tested object is x F, the adjustable coupling capacitor C is adjustedkThe capacitance of the adjustable resistor R5 and the capacitance of the adjustable capacitor R6 are equal, and then the values of the adjustable resistor R5 and the adjustable capacitor C1 and the adjustable capacitor C2 are adjusted, specifically:
the capacitance of the adjustable capacitors C1 and C2 is adjusted to 0.5x F;
the resistance values of the adjustable resistors R5 and R6 are adjusted to
Step three, collecting partial discharge signals
And (3) switching on a power supply, adjusting the frequency converter to change the voltage and the frequency at two ends of the tested equipment, reading a partial discharge signal on the partial discharge detection device after the test voltage is reached, and thus obtaining the partial discharge signal with the external interference signal filtered out.
4. The interference signal suppressing method according to claim 3, wherein the amplification factor of the differential operational amplifier in the interference signal eliminating apparatus is 3-5 times.
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