CN111596188A - Signal generator simulation device and high-frequency current partial discharge signal simulation method - Google Patents
Signal generator simulation device and high-frequency current partial discharge signal simulation method Download PDFInfo
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- CN111596188A CN111596188A CN202010466360.6A CN202010466360A CN111596188A CN 111596188 A CN111596188 A CN 111596188A CN 202010466360 A CN202010466360 A CN 202010466360A CN 111596188 A CN111596188 A CN 111596188A
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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
- 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
Abstract
The invention discloses a signal generator simulation device, which comprises a typical partial discharge signal model library, a control module, a signal generation module and a signal output module, wherein the typical partial discharge signal model library is used for storing a plurality of partial discharge signals; the typical partial discharge signal model library is used for generating a typical partial discharge signal model; the control module receives an external instruction, downloads a typical partial discharge signal model according to the external instruction, stores the typical partial discharge signal model in a main control unit memory of the control module and completes control instruction issuing; the signal generation module generates voltage signals with appointed phases, amplitudes and frequencies according to the control instruction, the voltage signals comprise partial discharge signals and noise signals, the signal output module integrates two paths of signals and outputs typical high-frequency partial discharge signals.
Description
Technical Field
The invention relates to the technical field of power engineering, in particular to a signal generator simulation device and a high-frequency current partial discharge signal simulation method, which are used for simulating and generating various typical high-frequency current partial discharge signals and providing typical signal sources for a high-frequency current partial discharge detector.
Background
With the continuous and rapid development of economy in China, the reliability and stability of power supply of a power grid system are more and more emphasized, the requirement is gradually improved, operation and maintenance of power equipment are gradually changed from power failure maintenance to live detection and online monitoring, and the live detection becomes one of the main means for acquiring the operation state of the power equipment and providing an effective decision for intelligent operation and maintenance. When the electric power equipment causes discharge due to local field intensity unevenness, high-frequency pulse current with the frequency band of 500KHz-50MHz is generated, and the current flows into the ground along the metal parts of the electric equipment through the grounding wire. In order to detect partial discharge pulse current signals of power equipment such as transformers, cables and lightning arresters in the frequency band, high-frequency current sensors are widely used and convert the detected current signals into voltage signals.
The requirements on the reliability of power supply of a power grid and the rapid popularization of the partial discharge live detection technology are gradually improved, the requirements on the field detection capability of live detection personnel are also gradually improved, training and competitions based on the construction of the live detection capability are gradually increased, and the mode of providing a signal source for the field live detection, the training and the competitions by simulating the partial discharge defects is widely used. However, a system device which can simulate various typical high-frequency current partial discharge signals, is suitable for conventional simulation tests and competition martial arts tests, further effectively trains live-line detection personnel to identify and effectively monitors partial discharge defects is not available at present. In order to solve the above problems, it is necessary to research a system device for generating a high-frequency current partial discharge signal by simulation, so as to generate various typical high-frequency partial discharge signals, facilitate stable output of field test, and solve the problems of single field partial discharge signal source, incapability of remote operation control, unfixed signal source phase and the like, thereby ensuring that the high-frequency current partial discharge signal source is accurately provided in the field training and competition processes, and effectively promoting popularization of the live detection technology and capability construction of detection personnel.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a signal generator simulation device and a high-frequency current partial discharge signal simulation method, which can effectively solve the problems that a field partial discharge signal source is single, cannot be operated and controlled remotely, the phase of the signal source is not fixed and the like, simulate the field typical fault defect and accurately provide the high-frequency current partial discharge signal source for the field training and competition processes.
One technical scheme for achieving the above purpose is as follows: a signal generator simulation device comprises a typical partial discharge signal model library, a control module, a signal generation module and a signal output module;
the typical partial discharge signal model library is used for generating a typical partial discharge signal model;
the control module receives an external instruction, downloads a typical partial discharge signal model in the typical partial discharge signal model library according to the external instruction, and completes the type, amplitude, PRPD map display, remote wireless control instruction execution, battery information management and control instruction issuing of the switching time of a relay of the partial discharge module;
the signal generating module generates voltage signals of specified phase, amplitude and frequency according to a control instruction, and comprises a partial discharge module and a noise module, wherein a relay switch circuit of the partial discharge module is connected with a control circuit pin in the main control unit, the noise module is connected with an amplifier, the amplification factor is adjusted to enable the amplitude of the output noise signal to be adjustable, and two paths of signals are output to the signal output module;
the signal output module integrates the two paths of signals and outputs a typical high-frequency partial discharge signal.
Preferably, the typical partial discharge signal library is configured to generate typical partial discharge signal models, and each typical partial discharge signal model has a set of binary data as phase and amplitude parameters of the control module for controlling the signal generation module to output the voltage signal.
Preferably, the type of the typical partial discharge signal model is 8 typical signals in total, namely an output partial discharge corona signal, a partial discharge levitation signal, a partial discharge air gap signal, a partial discharge edge signal, a partial discharge interference signal, a partial discharge corona and interference mixed signal, a partial discharge levitation and interference mixed signal and a calibration signal.
Preferably, the control module comprises a main control unit, and a wireless control module, a human-computer control interface and a slave control unit which are respectively connected with the main control unit; the slave control unit is used as an auxiliary control unit, is externally connected with a synchronous signal module and a noise module, and assists the main control unit to complete wireless signal synchronization and noise signal parameter setting instructions; the wireless control module is used for receiving an instruction sent by a remote control system; the man-machine control interface is internally provided with an LCD display screen, so that the selection of signal types, amplitudes, synchronous modes and working modes is realized, and PRPD maps of corresponding signals are displayed.
As a further preference, the device comprises two modes, namely a normal mode and a competition mode; in a conventional mode, the device freely selects a typical partial discharge signal model type, displays the typical partial discharge signal model type on the human-computer control interface, and outputs a corresponding signal through the signal output module; in a competition mode, the device closes the display function on the human-computer control interface, can not freely select the type of the output signal any more, receives an instruction sent by a remote control terminal through the wireless control module, and only outputs a corresponding signal through the signal output module.
Preferably, the device has two modes of a 220V alternating current mains supply signal synchronization mode and an internal synchronization mode; under the 220V alternating current commercial power signal synchronous mode, the device is connected with a power frequency power supply; in the internal synchronization mode, the control module generates a standard 50Hz square wave signal, and the output typical high-frequency partial discharge signal and the internal square wave signal keep phase synchronization.
A high-frequency current partial discharge signal simulation method based on the signal generator simulation device is characterized by comprising the following steps of:
a) selecting a PRPD map of a typical partial discharge signal, and setting a required pulse signal amplitude range, a phase resolution range and corresponding coordinate axes;
b) tracing points in the typical partial discharge signal map, and intercepting amplitude and phase data of original pulses;
c) carrying out amplitude, phase rounding, sequential distribution, random distribution, phase period filling, data mark bit marking, hexadecimal and binary conversion operation on the amplitude and phase data to generate a high-frequency current partial discharge PRPD pulse original data table with a specified format;
d) downloading the original data table into a memory of a main control unit in a control unit, wherein the main control unit controls the partial discharge module to output a voltage signal, and simultaneously controls the amplitude of a noise signal output by the slave control unit;
e) and the signal output module integrates the two paths of signals to form a typical high-frequency partial discharge signal which is finally output.
The signal generator simulation device can receive remote control, simulate and generate various typical high-frequency partial discharge signals, accurately provide a high-frequency current partial discharge signal source for field training and competition, and effectively promote popularization of a live detection technology and capability construction of detection personnel.
Drawings
FIG. 1 is a schematic diagram of a signal generator simulation apparatus according to the present invention;
fig. 2 is a schematic flow chart of a high-frequency current partial discharge signal simulation method according to the present invention.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:
referring to fig. 1, a signal generator simulation apparatus according to the present invention includes a typical partial discharge signal model library 1, a control module 2, a signal generation module 3, and a signal output module 4.
The representative partial discharge signal model library 1 is used to generate a representative partial discharge signal model. The typical partial discharge signal model library is stored in a main control unit memory in the control module in the form of binary data streams, each typical signal corresponds to one data model for the control module to read, and the included binary data are phase and amplitude parameters of the output voltage signal of the control module control signal generation module. The typical types of the partial discharge signal models are 8 typical signals in total, namely an output partial discharge corona signal, a partial discharge suspension signal, a partial discharge air gap signal, a partial discharge edge signal, a partial discharge interference signal, a partial discharge corona and interference mixed signal, a partial discharge suspension and interference mixed signal and a calibration signal.
The control module 2 comprises a main control unit 21, and a wireless control module 22, a man-machine control interface 23 and a slave control unit 24 which are respectively connected with the main control unit 21, wherein the slave control unit 24 is connected with a synchronous signal module 25. The control module 21 is used for implementing data and instruction communication among the internal sub-modules. The main control unit 21 receives control instructions of the wireless control module 22 and the human-computer control interface 23, and sends operation instructions to the signal generation module 3 and the slave control unit 24, so as to complete the issuing of instructions such as typical signal types, amplitude values, PRPD map display, remote wireless control instruction execution, battery information management, relay switching time control of the partial discharge module and the like. The slave control unit 24 is used as an auxiliary control unit and is externally connected with the synchronous signal module 25 and the noise module 32 to assist the main control unit to complete wireless signal synchronization and noise signal parameter setting instructions. The wireless control module 22 is used for receiving an instruction sent by a remote control system; the human-computer control interface 23 is internally provided with an LCD display screen, realizes the selection of signal types, amplitudes, synchronous modes and working modes, and displays PRPD maps of corresponding signals.
The signal generating module 3 generates voltage signals with specified phase, amplitude and frequency according to the control instruction, and comprises an partial discharge module 31 and a noise module 32, wherein a relay switch circuit of the partial discharge module 31 is connected with a control circuit pin inside the main control unit 21, the noise module 32 is connected with an amplifier 33, the amplification factor is adjusted to enable the amplitude of the output noise signals to be adjustable, and the two paths of signals are both output to the signal output module 4.
The signal output module 4 synthesizes the two paths of signals and outputs a typical high-frequency partial discharge signal.
The device comprises a conventional mode and a competition mode; in a conventional mode, the device freely selects a typical partial discharge signal model type, displays the type on a human-computer control interface, and outputs a corresponding signal through a signal output module; in the competition mode, the device closes the display function on the man-machine control interface, can not freely select the type of the output signal any more, receives an instruction sent by the remote control terminal through the wireless control module, and outputs a corresponding signal only through the signal output module.
The device has two modes of a 220V alternating current commercial power signal synchronous mode and an internal synchronous mode; under the 220V alternating current commercial power signal synchronous mode, the device is connected with a power frequency power supply; in the internal synchronization mode, the control module generates a standard 50Hz square wave signal, and the output typical high-frequency partial discharge signal and the internal square wave signal keep phase synchronization.
Referring to fig. 2, a method for simulating a high-frequency current partial discharge signal according to the present invention includes the following steps:
(a) determining a certain typical partial discharge defect, selecting a PRPD map of a typical high-frequency current partial discharge signal which represents the defect characteristic, and setting a required pulse signal amplitude range, a phase resolution range and corresponding coordinate axes on the map;
(b) tracing points in the typical high-frequency partial discharge signal map, intercepting amplitude and phase data of original pulses, and storing the intercepted original data;
(c) circularly performing amplitude and phase rounding processing on the amplitude and phase data, converting all amplitudes into integers, and distributing the phase data in a [0,360 DEG ] interval; continuing to perform sequential distribution or random distribution processing on the data to make the finally formed pulse dotting on the PRPD in a sequential manner or in a random order; continuing to fill the phase period of the data, and increasing the pulse with the amplitude of 0 under the condition that the phase interval of adjacent pulses of the local discharge signal is less than 180 degrees so as to increase the pulse period; continuously marking data marking bits on the data, and converting the data into hexadecimal, wherein the highest bit is used for distinguishing partial discharge signals and interference signals, and the second highest bit is used for distinguishing positive amplitude pulses and negative amplitude pulses; placing the data at the appointed position of the data table one by one according to the phase and the amplitude to form a final high-frequency current partial discharge PRPD pulse original data table;
(d) based on the method for simulating the high-frequency current partial discharge PRPD pulse original data, typical 8 types of PRPD map original data such as partial discharge corona, partial discharge suspension, partial discharge air gap, partial discharge surface, interference, partial discharge corona + interference, partial discharge suspension + interference, calibration signals and the like are formed together, and all binary data streams are downloaded to a main control unit memory in a high-frequency current partial discharge signal simulation device;
(e) the main control unit reads binary data in the memory, controls the switching of the relay in the partial discharge module, and the output module outputs a voltage signal with specified amplitude and time interval, namely a high-frequency current analog signal.
The following examples are further described below.
Example 1
The embodiment provides a process for analog output of a high-frequency current partial discharge suspension discharge PRPD pulse signal, which mainly comprises two parts, namely atlas data interception and data processing. Selecting a PRPD typical map of a high-frequency current signal during partial discharge and suspension discharge, storing the map into a picture format, setting a horizontal axis coordinate range (namely a phase range) and a vertical axis coordinate range (namely a pulse amplitude range) for the map, tracing points in the set coordinate system, acquiring data of each pulse point on the map one by one, and storing the data in an original data table after all data are acquired. Reading data in an original data table, rounding the phase and amplitude of each pulse in the original data, converting all amplitudes into integers, and distributing the phase data in a [0,360 DEG ] interval; continuing to perform sequential distribution or random distribution processing on the data to make the finally formed pulse dotting on the PRPD according to a sequential mode or a random sequence; continuously filling the phase period of the data, increasing a series of pulses with amplitude of 0 to increase the number of pulse periods under the condition that the phase interval of adjacent pulses of the partial discharge signal is less than 180 degrees; marking the data continuously, and converting the data into hexadecimal, wherein the highest bit is used for distinguishing partial discharge signals and interference signals, and the second highest bit is used for distinguishing positive amplitude pulses and negative amplitude pulses; and then the data are placed at the appointed position of the data table one by one according to the phase and the amplitude, and the final high-frequency current partial discharge PRPD pulse binary data stream is formed. And downloading the binary data stream into a main control unit memory, reading data, setting signal setting and type selection in a human-computer control interface, carrying out signal pulse voltage signals by a relay in a control signal generation module of the internal main control unit according to the set amplitude, frequency and phase, and displaying a corresponding PRPD map on the human-computer control interface of the analog device.
Example 2
This embodiment describes a process of setting an output of the high-frequency current partial discharge signal simulation apparatus using a human control interface in a normal mode. The control panel is provided with pull-down menu tabs such as signal type selection, signal strength selection, synchronizer selection type and the like. The signal type options comprise 8 signals of partial discharge corona, suspension, air gap, edge surface, interference, corona + interference, suspension + interference and calibration signals; the signal strength options comprise four signal strengths of 1, 2, 3 and 4, wherein the larger the number is, the stronger the signal strength is; the synchronizer type comprises two working types of 220V alternating current mains supply signal synchronization and internal synchronization, the selection type is correspondingly selected, and the output signal is output according to the parameters.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that the changes and modifications of the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (7)
1. A signal generator simulation device comprises a typical partial discharge signal model library, a control module, a signal generation module and a signal output module, and is characterized in that:
the typical partial discharge signal model library is used for generating a typical partial discharge signal model;
the control module receives an external instruction, downloads a typical partial discharge signal model in the typical partial discharge signal model library according to the external instruction, and completes the type, amplitude, PRPD map display, remote wireless control instruction execution, battery information management and control instruction issuing of the switching time of a relay of the partial discharge module;
the signal generating module generates voltage signals of specified phase, amplitude and frequency according to a control instruction, and comprises a partial discharge module and a noise module, wherein a relay switch circuit of the partial discharge module is connected with a control circuit pin in the main control unit, the noise module is connected with an amplifier, the amplification factor is adjusted to enable the amplitude of the output noise signal to be adjustable, and two paths of signals are output to the signal output module;
the signal output module integrates the two paths of signals and outputs a typical high-frequency partial discharge signal.
2. The signal generator simulation apparatus of claim 1, wherein the typical partial discharge signal model library is configured to generate typical partial discharge signal models, and each of the typical partial discharge signal models has a set of binary data as parameters of a phase and an amplitude of the output voltage signal of the control signal generation module.
3. The signal generator simulator of claim 2, wherein the typical partial discharge signal model is of 8 types of typical signals, including an output partial discharge corona signal, a partial discharge floating signal, a partial discharge air gap signal, a partial discharge edge signal, a partial discharge interference signal, a partial discharge corona plus interference mixed signal, a partial discharge floating plus interference mixed signal, and a calibration signal.
4. The signal generator simulator as claimed in claim 1, wherein the control module comprises a master control unit, and a wireless control module, a human-machine control interface and a slave control unit respectively connected to the master control unit; the slave control unit is used as an auxiliary control unit, is externally connected with a synchronous signal module and a noise module, and assists the main control unit to complete wireless signal synchronization and noise signal parameter setting instructions; the wireless control module is used for receiving an instruction sent by a remote control system; the man-machine control interface is internally provided with an LCD display screen, so that the selection of signal types, amplitudes, synchronous modes and working modes is realized, and PRPD maps of corresponding signals are displayed.
5. A signal generator simulator as claimed in claim 4, wherein the device includes both a normal mode and a race mode; in a conventional mode, the device freely selects a typical partial discharge signal model type, displays the typical partial discharge signal model type on the human-computer control interface, and outputs a corresponding signal through the signal output module; in a competition mode, the device closes the display function on the human-computer control interface, can not freely select the type of the output signal any more, receives an instruction sent by a remote control terminal through the wireless control module, and only outputs a corresponding signal through the signal output module.
6. A signal generator simulation apparatus as claimed in claim 4, wherein the apparatus has two modes, a 220V AC mains signal synchronization mode and an internal synchronization mode; under the 220V alternating current commercial power signal synchronous mode, the device is connected with a power frequency power supply; in the internal synchronization mode, the control module generates a standard 50Hz square wave signal, and the output typical high-frequency partial discharge signal and the internal square wave signal keep phase synchronization.
7. A high-frequency current partial discharge signal simulation method based on the signal generator simulation device is characterized by comprising the following steps of:
a) selecting a PRPD map of a typical partial discharge signal, and setting a required pulse signal amplitude range, a phase resolution range and corresponding coordinate axes;
b) tracing points in the typical partial discharge signal map, and intercepting amplitude and phase data of original pulses;
c) carrying out amplitude, phase rounding, sequential distribution, random distribution, phase period filling, data mark bit marking, hexadecimal and binary conversion operation on the amplitude and phase data to generate a high-frequency current partial discharge PRPD pulse original data table with a specified format;
d) downloading the original data table into a memory of a main control unit in a control unit, wherein the main control unit controls the partial discharge module to output a voltage signal, and simultaneously controls the amplitude of a noise signal output by the slave control unit;
e) and the signal output module integrates the two paths of signals to form a typical high-frequency partial discharge signal which is finally output.
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| CN113253183A (en) * | 2021-05-17 | 2021-08-13 | 中国电力科学研究院有限公司 | Method and system for detecting external interference signal reproduction by partial discharge of power cable |
| CN117092573A (en) * | 2023-01-18 | 2023-11-21 | 特变电工山东鲁能泰山电缆有限公司 | Partial discharge analog signal generating device and partial discharge detection system |
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