CN111060786A - Partial discharge generating device and method with adjustable discharge quantity and density based on phase - Google Patents
Partial discharge generating device and method with adjustable discharge quantity and density based on phase Download PDFInfo
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- CN111060786A CN111060786A CN201911295225.3A CN201911295225A CN111060786A CN 111060786 A CN111060786 A CN 111060786A CN 201911295225 A CN201911295225 A CN 201911295225A CN 111060786 A CN111060786 A CN 111060786A
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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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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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 utility model provides a partial discharge generating device and a method with adjustable discharge capacity and density based on phase, which comprises a main control unit, a PWM circuit, a filter circuit, a pulse generating circuit, a phase shaping circuit, a key and a knob switch; the pulse generating circuit is used for generating a discharge pulse according to an instruction of the main control unit, the PWM circuit is used for generating a pulse voltage according to the instruction of the main control unit, the pulse voltage is stabilized and smoothed into a direct current voltage through the filter circuit and then input into the pulse generating circuit to regulate the voltage of the pulse generating circuit, and further stable discharge voltage is output, and the phase shaping circuit is used for shaping a phase pulse output by the main control unit into a sinusoidal signal serving as a phase output signal; the method and the device can realize the verification and performance evaluation of the partial discharge monitoring system and the equipment thereof, thereby ensuring the safe operation of the partial discharge monitoring system, finally ensuring the safe operation of the cable and ensuring the stability and reliability of power supply.
Description
Technical Field
The disclosure relates to the technical field of analog partial discharge pulse generators, in particular to a partial discharge generating device and method with adjustable discharge capacity and density based on phases.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the rapid development of national economy, the power demand is increasing day by day, and the construction of power transmission lines is synchronously increased; meanwhile, with the continuous progress of science and technology, the safety requirements on the power supply line are higher and higher. Partial discharge is used as a main expression form of the early stage of insulation fault of a high-voltage cable line, and is a main cause of insulation aging and a main characteristic parameter for representing the insulation condition. The local discharge amount of a high-voltage cable line is closely related to the insulation condition of a power cable, and the change of the local discharge amount indicates that the defect which can endanger the safe operation of the cable exists in the cable insulation. Therefore, partial discharge monitoring is increasingly applied to safety monitoring of transmission and distribution circuitry. Thus, the requirements of checking and performance evaluation of the partial discharge monitoring system and the equipment thereof are generated.
The inventor of the disclosure finds that the discharge simulation experiment device aiming at the test of the power cable partial discharge system monitoring system in the current market can only simulate simple discharge pulse, or the equipment is large and complex and is inconvenient to carry and apply.
Disclosure of Invention
In order to overcome the defects of the prior art, the disclosure provides a partial discharge generating device and a partial discharge generating method with adjustable discharge quantity and density based on phases, which can realize the verification and performance evaluation of a partial discharge monitoring system and equipment thereof, thereby ensuring the safe operation of the partial discharge monitoring system, finally ensuring the safe operation of a cable, and ensuring the stability and reliability of power supply.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the first aspect of the disclosure provides a partial discharge generating device with adjustable phase-based discharge amount and density.
A partial discharge generating device with adjustable discharge quantity and density based on phase comprises a main control unit, a PWM circuit module, a filter circuit module, a pulse generating circuit module, a phase shaping circuit module, a key module and a knob switch module; the main control unit is used for adjusting parameter setting, outputting phase pulse and managing discharge voltage and discharge time according to the received input of the key and the knob switch;
the pulse generating circuit module is used for generating discharging pulses according to instructions of the main control unit, the PWM circuit module is used for generating pulse voltage according to the instructions of the main control unit, the pulse voltage is stably and smoothly converted into direct current voltage through the filter circuit module and then input into the pulse generating circuit to adjust the voltage of the pulse generating circuit, and further stable discharging voltage is output, and the phase shaping circuit module is used for shaping phase pulses output by the main control unit into sine signals serving as phase output signals.
As some possible implementation manners, the device further comprises a battery management circuit module, which is used for performing charging management on the battery and converting power supply provided by the battery into voltage required by each circuit.
As some possible implementation manners, the power supply device further comprises a voltage boosting circuit module, and the voltage boosting circuit module is used for supplying 12V to 100V provided by the battery to the PWM circuit module.
As some possible implementation manners, the knob switch module includes a first rotary knob switch, and is configured to control the discharge frequency of each power frequency cycle, so as to achieve adjustable discharge density.
As some possible implementations, the key is used for selecting the operation mode and setting the initial phase.
As some possible implementations, the knob switch module further includes a second rotary knob switch for stepless adjustment of the discharge amount by rotation.
The second aspect of the present disclosure provides a phase-based partial discharge generation method with adjustable discharge amount and density.
A partial discharge generating method with adjustable discharge amount and density based on phase is characterized in that by utilizing the partial discharge generating device with adjustable discharge amount and density based on phase in the first aspect of the disclosure, a touch key operation menu is used for selecting a working mode, the discharge frequency of each power frequency period is set, the initial phase of discharge is set, the discharge amount is set between 10pC and 10000pC by adjusting a first knob switch, and the discharge frequency of each power frequency period is controlled by adjusting a second knob switch, so that the discharge density is adjustable.
As some possible implementations, the operation mode includes a forward discharge pulse correction mode and a reverse discharge pulse correction mode;
the forward discharge pulse correction mode generates a forward discharge pulse with settable discharge capacity on an adjustable power frequency phase, and is used for correcting a measured value of the partial discharge detection system on forward discharge;
the reverse discharge pulse correction mode generates a reverse discharge pulse with settable discharge capacity at an adjustable power frequency phase, and is used for correcting the measured value of the partial discharge detection system on reverse discharge.
As some possible implementation manners, the working modes further include a symmetrical isoelectric discharge mode and a forward triangular discharge mode;
the symmetrical isoelectric discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge in an adjustable power frequency phase interval, the discharge pulse is displayed as two segments of forward and reverse segments on a PRPD graph, and the phase difference of the two segments is 180 degrees;
the positive triangular discharge mode generates positive discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval, and the discharge pulse is displayed as a positive triangle on a PRPD graph.
As some possible implementation manners, the working modes further include a symmetrical triangular discharge mode and a symmetrical arc discharge mode;
the symmetrical triangular discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval, discharge pulses are shown as a forward triangle and a reverse triangle on a PRPD graph, and the phase difference of the two triangles is 180 degrees;
the symmetrical arc discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval, discharge pulses are displayed as a forward arc and a reverse arc on a PRPD graph, and the phase difference of the two arcs is 180 degrees.
As some possible implementation manners, the working mode further includes a simulated corona discharge mode, a simulated creeping discharge mode and a simulated internal discharge mode, and pulse discharge with adjustable maximum discharge amount is generated in an adjustable power frequency phase interval respectively to perform simulation of corona discharge, creeping discharge and internal discharge.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the device and the system can realize the verification and performance evaluation of the partial discharge monitoring system and the equipment thereof, thereby ensuring the safe operation of the partial discharge monitoring system, finally ensuring the safe operation of the cable and ensuring the stability and reliability of power supply.
2. The device and the system disclosed by the disclosure comprise nine simulated discharge modes, so that more comprehensive discharge simulation is realized, and the evaluation capability of the partial discharge monitoring system is greatly improved.
3. The device and the system realize the correction of the partial discharge detection system on the forward discharge measured value and the reverse discharge measured value through the forward discharge pulse correction mode and the reverse discharge pulse correction mode, and greatly improve the measurement accuracy of the partial discharge detection system.
4. The device and the system are used for correcting the discharge measurement value of the partial discharge detection system through the symmetrical equivalent electric discharge mode, and simultaneously are used for evaluating the PRPD drawing capability of the partial discharge monitoring system, so that the evaluation capability of the partial discharge monitoring system is improved.
5. Compared with other modes, the device and the system further improve the evaluation on the PRPD drawing capability of the partial discharge monitoring system through the forward triangular discharge mode, the symmetrical triangular discharge mode and the symmetrical arc discharge mode.
6. The device and the system realize the evaluation of the monitoring capability of the partial discharge monitoring system on corona discharge, creeping discharge and internal discharge through simulating a corona discharge mode, a creeping discharge mode and an internal discharge mode.
Drawings
Fig. 1 is a schematic structural diagram of a partial discharge generating device with adjustable phase-based discharge amount and density according to embodiment 1 of the present disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
as shown in fig. 1, an embodiment 1 of the present disclosure provides a partial discharge generating device with adjustable discharge amount and density based on a phase, including a Main Control Unit (MCU), a PWM circuit module, a filter circuit module, a pulse generating circuit module, a phase shaping circuit module, a key module, and a knob switch module;
the main control unit is used for adjusting parameter setting, outputting phase pulse and managing discharge voltage and discharge time according to the received input of the key and the knob switch;
the pulse generating circuit module is used for generating discharge pulses according to instructions of the main control unit, the PWM circuit module is used for generating pulse voltage according to the instructions of the main control unit, the pulse voltage is stabilized and smoothed into direct-current voltage through the filter circuit module and then input into the pulse generating circuit for voltage regulation of the pulse generating circuit, and then stable discharge voltage is output;
and the phase shaping circuit module is used for shaping the phase pulse output by the main control unit into a sinusoidal signal as a phase output signal.
The device also comprises a battery management circuit module which is used for carrying out charging management on the battery and converting the power supply provided by the battery into the voltage required by each circuit, and a booster circuit module which is used for supplying power to the PWM circuit module from the 12V voltage provided by the battery to 100V.
The button is used for selecting a working mode and setting an initial phase, the knob switch module comprises a first knob switch and a second knob switch, and the first knob switch is used for controlling the discharge frequency of each power frequency period so as to realize adjustable discharge density; the second rotary knob switch is used for stepless adjustment of the discharge amount through rotation.
In the embodiment, the working mode is selected by touching the key operation menu, the discharge frequency of each power frequency period is set, and the initial phase of discharge is set. The discharge amount is set between 10pC and 10000pC by adjusting the knob switch 1. The discharge density is set between 90 times and 720 times of equivalent discharge times in each power frequency period by adjusting the knob switch 2.
The embodiment simulates partial discharge of a power cable through capacitor charge and discharge, realizes regulation of discharge amount through regulating charge and discharge voltage, realizes voltage regulation through MCU control PWM pulse width, and obtains phase output through shaping square waves output by the MCU.
The partial discharge generating device has nine working modes, specifically:
nine working modes:
the first mode is as follows: and in the forward discharge pulse correction mode, a forward discharge pulse with settable discharge capacity is generated on an adjustable power frequency phase and is used for correcting a measured value of the partial discharge detection system on forward discharge.
And a second mode: and in the reverse discharge pulse household mode, a reverse discharge pulse with settable discharge capacity is generated at the adjustable power frequency phase and is used for correcting the measured value of the partial discharge detection system on the reverse discharge.
And a third mode: the symmetrical equivalent-power discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval. The discharge pulse, measured by the partial discharge detection system, should be shown as two segments in the forward and reverse directions on the PRPD graph, and the two segments should be 180 degrees out of phase. Used for correcting the measured value of the partial discharge detection system to discharge and evaluating the PRPD mapping capability of the partial discharge monitoring system.
For example, the initial phase of discharge is set to 15 degrees by touching the key, the discharge point interval is set to 30 degrees, the maximum discharge amount is set to 2000pC by the rotary switch 1, and the discharge density is set to 360 equivalent discharge times per power frequency cycle by the rotary switch 2. The device realizes that the stored electric quantity of the discharge capacitor is 2000pC by adjusting the voltage of the discharge capacitor. The initial discharge phase is set to 15 degrees, and the discharge is carried out between 15 degrees and 45 degrees and between 195 degrees and 225 degrees in the output power frequency phase signal. The discharge is carried out once every 1 degree of power frequency phase in the two intervals, namely, the discharge is carried out once every 55.6uS in the two intervals.
And a fourth mode: and in the forward triangular discharge mode, forward discharge with adjustable maximum discharge capacity is generated in an adjustable power frequency phase interval. The discharge pulse, measured by the partial discharge detection system, should appear as a forward triangle on the PRPD plot. Used to evaluate the PRPD mapping capability of partial discharge monitoring systems.
For example, the initial phase of discharge is set to 15 degrees by touching the key, the discharge point interval is set to 30 degrees, the maximum discharge amount is set to 2000pC by the rotary switch 1, and the discharge density is set to 360 equivalent discharge times per power frequency cycle by the rotary switch 2. The device adjusts the discharge amount to 2000pC and discharges for a plurality of times at the power frequency phase of 30 degrees. Then the discharge amount is adjusted to 1800pC and the discharge is carried out for several times at the frequency of phase interval 1 degree between 25 degrees and 35 degrees of power frequency. Then the discharge amount is adjusted to 1600PC, and the discharge is carried out for a plurality of times at the frequency of phase interval 1 degree at the power frequency phase of 20 degrees to 40 degrees. Then discharge is carried out for several times at the frequency of 1 degree phase interval in the phase of 15 degrees to 45 degrees at the power frequency with the discharge amount adjusted to 1400 PC. Such discharge models should appear as forward triangles on the PRPD plot after passing through the partial discharge detection system.
And a fifth mode: the symmetrical triangular discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval. The discharge pulse measured by the partial discharge detection system should be shown as a forward triangle, a reverse triangle on the PRPD chart, and the two triangles are 180 degrees out of phase. Used to evaluate the PRPD mapping capability of partial discharge monitoring systems.
Mode six: the symmetrical arc discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval. The discharge pulse, measured by the partial discharge detection system, should be shown on the PRPD chart as one forward arc and one reverse arc, and the two arcs should be 180 degrees out of phase. Used to evaluate the PRPD mapping capability of partial discharge monitoring systems.
Mode seven: and simulating corona discharge to generate pulse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval. After the discharge pulse is measured by the partial discharge detection system, it should be possible to judge this as corona discharge.
And a mode eight: and simulating creeping discharge to generate pulse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval. After the discharge pulse is measured by the partial discharge detection system, it should be possible to determine that this is creeping discharge.
The mode nine: and simulating internal discharge to generate pulse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval. After the discharge pulse is measured by the partial discharge detection system, it should be possible to determine that this is an internal discharge.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A partial discharge generating device with adjustable discharge quantity and density based on phase is characterized by comprising a main control unit, a PWM circuit module, a filter circuit module, a pulse generating circuit module, a phase shaping circuit module, a key module and a knob switch module; the main control unit is used for adjusting parameter setting, outputting phase pulse and managing discharge voltage and discharge time according to the received input of the key and the knob switch;
the pulse generating circuit module is used for generating discharging pulses according to instructions of the main control unit, the PWM circuit module is used for generating pulse voltage according to the instructions of the main control unit, the pulse voltage is stably and smoothly converted into direct current voltage through the filter circuit module and then input into the pulse generating circuit to adjust the voltage of the pulse generating circuit, and further stable discharging voltage is output, and the phase shaping circuit module is used for shaping phase pulses output by the main control unit into sine signals serving as phase output signals.
2. The phase-based partial discharge generating device with adjustable discharge quantity and density is characterized in that the device also comprises a battery management circuit module, a local discharge generating module and a local discharge generating module, wherein the battery management circuit module is used for performing charge management on a battery and converting power supply provided by the battery into voltage required by each circuit;
or, the device also comprises a boosting circuit module which is used for supplying power to the PWM circuit module from the voltage of 12V provided by the battery to 100V.
3. The apparatus of claim 1, wherein the knob switch module comprises a first rotary knob switch for controlling the number of discharges per power frequency cycle for adjusting the discharge density.
4. The phase-based partial discharge generating apparatus with adjustable discharge quantity and density according to claim 1, wherein the key is used for selecting an operation mode and setting an initial phase.
5. The apparatus according to claim 1, wherein the knob switch module further comprises a second rotary knob switch for stepless adjustment of the discharge amount by rotation.
6. A partial discharge generation method with adjustable discharge amount and density based on phase is characterized in that by using the partial discharge generation device with adjustable discharge amount and density based on phase according to any one of claims 1-5, a touch key operation menu is used for selecting a working mode, the discharge frequency of each power frequency period is set, the initial phase of discharge is set, the discharge amount is set between 10pC and 10000pC through an adjusting knob switch, and the discharge frequency of each power frequency period is controlled through adjusting a second knob switch, so that the discharge density is adjustable.
7. The method for generating partial discharges with adjustable phase-based discharge volume and density according to claim 6, wherein the operation mode comprises a forward discharge pulse correction mode and a reverse discharge pulse correction mode;
the forward discharge pulse correction mode generates a forward discharge pulse with settable discharge capacity on an adjustable power frequency phase, and is used for correcting a measured value of the partial discharge detection system on forward discharge;
the reverse discharge pulse correction mode generates a reverse discharge pulse with settable discharge capacity at an adjustable power frequency phase, and is used for correcting the measured value of the partial discharge detection system on reverse discharge.
8. The method for generating partial discharges with adjustable phase-based discharge volume and density according to claim 6, wherein the operation modes further include a symmetrical iso-electric discharge mode and a forward triangular discharge mode;
the symmetrical isoelectric discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge in an adjustable power frequency phase interval, the discharge pulse is displayed as two segments of forward and reverse segments on a PRPD graph, and the phase difference of the two segments is 180 degrees;
the positive triangular discharge mode generates positive discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval, and the discharge pulse is displayed as a positive triangle on a PRPD graph.
9. The method for generating partial discharges with adjustable phase-based discharge volume and density according to claim 6, wherein the operation modes further include a symmetrical triangular discharge mode and a symmetrical arc discharge mode;
the symmetrical triangular discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval, discharge pulses are shown as a forward triangle and a reverse triangle on a PRPD graph, and the phase difference of the two triangles is 180 degrees;
the symmetrical arc discharge mode generates forward discharge and reverse discharge with adjustable maximum discharge capacity in an adjustable power frequency phase interval, discharge pulses are displayed as a forward arc and a reverse arc on a PRPD graph, and the phase difference of the two arcs is 180 degrees.
10. The method for generating partial discharge with adjustable phase-based discharge amount and density according to claim 6, wherein the operation mode further comprises a simulated corona discharge mode, a simulated creeping discharge mode and a simulated internal discharge mode, wherein pulse discharge with adjustable maximum discharge amount is generated in an adjustable power frequency phase interval respectively, and simulation of corona discharge, creeping discharge and internal discharge is performed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911295225.3A CN111060786A (en) | 2019-12-16 | 2019-12-16 | Partial discharge generating device and method with adjustable discharge quantity and density based on phase |
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| CN201911295225.3A CN111060786A (en) | 2019-12-16 | 2019-12-16 | Partial discharge generating device and method with adjustable discharge quantity and density based on phase |
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| CN111736049A (en) * | 2020-08-05 | 2020-10-02 | 广东电网有限责任公司 | Generator for simulating partial discharge signal |
| CN112557840A (en) * | 2020-11-24 | 2021-03-26 | 西南交通大学 | XLPE cable insulation state evaluation method based on discharge energy difference |
| CN113138323A (en) * | 2021-03-12 | 2021-07-20 | 深圳供电局有限公司 | Partial discharge type recognition device |
| CN118226214A (en) * | 2024-05-06 | 2024-06-21 | 青岛艾诺仪器有限公司 | Method, medium and equipment for detecting partial discharge of lithium battery core |
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