CN112858762A - Method for analyzing resistive current and harmonic current of lightning arrester - Google Patents
Method for analyzing resistive current and harmonic current of lightning arrester Download PDFInfo
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Abstract
The invention discloses a method for analyzing resistive current and harmonic current of a lightning arrester, which comprises the following steps of: s1: acquiring an online monitoring signal of the arrester and inputting arrester nameplate information on a transformer substation site; s2: the analysis platform performs FFT calculation, total current calculation and resistive current calculation on the acquired voltage and current data: s3: analyzing and judging the arrester data acquired in real time, automatically comparing the data with the standard limit value of each arrester in each transformer substation, and judging whether the data exceed the standard limit value, so that the state of the single-phase arrester can be sensed; s4: the lightning arrester analysis platform carries out intelligent decision according to the data, and the intelligent decision carries out comprehensive processing on the analysis result of the full current test value, the analysis result of the angle test value and the analysis result of the resistive current test value; s5: and sending the lightning arrester decision information. The invention is convenient for operation and maintenance maintainers to carry out manual judgment, improves the accuracy of data measurement, and improves the intellectualization and informatization of operation and maintenance.
Description
Technical Field
The invention relates to a resistive current and harmonic current analysis method, in particular to a method for analyzing resistive current and harmonic current of a lightning arrester.
Background
The insulation capability of power equipment is an important factor determining safe and stable operation of the power equipment, the quantity of high-voltage power equipment is more and more at present, the voltage level is higher and higher, the defects of a field test method of the power equipment and insulation faults of the operated power equipment seriously threaten the safe operation of a power system, and in recent years, the fact that in an online monitoring test of a lightning arrester, only full current is monitored, the full current cannot react with and is insensitive to insulation internal defects in time, and the insulation defects are just one of defect types which can cause major accidents.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for analyzing the resistive current and the harmonic current of the lightning arrester can realize real-time monitoring and analysis of the running state of the lightning arrester, timely alarm when problems are found, and improve the working efficiency.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a method for analyzing resistive current and harmonic current of a lightning arrester comprises the following steps:
s1: acquiring an online monitoring signal of the arrester and inputting arrester nameplate information on a transformer substation site;
collecting an online monitoring signal of the lightning arrester: the method comprises the following steps that an arrester online monitoring stainless steel box body is installed on an arrester pillar at intervals, a wiring groove, an acquisition module, a power supply module, a communication module and an air switch are arranged in the box body, an arrester leakage current sensor is connected between an arrester base and a counter in series, arrester leakage current is converted into a secondary signal and is input to the acquisition module in the arrester online monitoring stainless steel box through a current sensor cable, the acquisition module in the box body samples the leakage current, and an analog-to-digital conversion value is transmitted to an analysis platform on a remote cloud server through a 4G wireless Internet of things GPRS network;
inputting lightning arrester nameplate information: inputting information such as a transformer substation name, a line number, a lightning arrester type, a model, a voltage grade, a rated voltage, a continuous operation voltage, a manufacturer, production time, input operation time, service life, remarks and the like into an analysis platform in a transformer substation field photographing mode, a PMS information exporting mode and a file inquiring mode;
s2: the analysis platform calculates the acquired voltage and current data as follows:
1) FFT computation
The analysis platform selects 512-point FFT sinusoidal signals of a lightning arrester leakage current single period to carry out A/D sampling according to the amplitude values of current and voltage, then FFT calculation is carried out, and ADS8558 of TI company is selected by the A/D sampling;
the FFT implementation method comprises the following steps: the operation result is a vector with phase information, and the acquired FFT data not only comprises amplitude information but also comprises phase information; the phase of each signal frequency component determines the specific waveform of the signal in the time domain; the physical resolution of the FFT is: sampling rate/number of sampling points, and the frequency of the analysis signal is integral multiple of the value;
2) full current calculation
The total current effective value only contains fundamental wave, 3-order, 5-order and 7-order harmonic waves, and the calculation formula is as follows:
Ix=
3) resistive current calculation
The calculation formula is as follows:
Ir= Ix cosΦ
wherein Ix is total current, Ir is resistive current, and the phi value is measured by a circuit board;
s3: analyzing and judging the arrester data acquired in real time, automatically comparing the data with the standard limit value of each arrester in each transformer substation, and judging whether the data exceed the standard limit value, so that the state of the single-phase arrester can be sensed;
1) analyzing a full current test value, and judging according to the following steps:
1.1 when the total current test value is less than or equal to the total current standard limit value multiplied by 40 percent, the data of the total current test value is interfered;
1.2 when the full current standard limit value is multiplied by 40 percent and the full current test value is less than or equal to the full current standard limit value is multiplied by 70 percent, the state of the full current test value is excellent;
1.3 when the full current standard limit value is multiplied by 70 percent and the full current test value is less than or equal to the full current standard limit value and multiplied by 100 percent, the state of the full current test value is good;
1.4 when the full current test value is larger than the full current standard limit value multiplied by 100 percent, the state of the full current test value is poor;
2) analyzing an angle test value, and judging according to the following steps:
2.1 when the angle test value is more than or equal to 90 degrees, the angle test value data is interfered;
2.2 when the angle test value is more than 85 degrees and less than or equal to 90 degrees, the angle test value state is excellent;
2.3 when the angle test value is more than 75 degrees and less than or equal to 85 degrees, the angle test value state is good;
2.4 when the angle test value is less than or equal to 75 degrees, the state of the angle test value is poor;
3) analyzing a resistive current test value, and judging according to the following steps:
3.1 when the resistive current test value is less than or equal to the resistive current standard limit value multiplied by 40 percent, the data of the resistive current test value is interfered;
3.2 when the resistive current standard limit value is multiplied by 40 percent and the resistive current test value is less than or equal to the resistive current standard limit value and multiplied by 70 percent, the state of the resistive current test value is excellent;
3.3 when the resistive current standard limit value is multiplied by 70 percent and the resistive current test value is less than or equal to the resistive current standard limit value and multiplied by 100 percent, the state of the resistive current test value is good;
3.4 when the resistive current test value is larger than the resistive current standard limit value multiplied by 100 percent, the state of the resistive current test value is poor;
s4: the lightning arrester analysis platform carries out intelligent decision according to the data, and the intelligent decision carries out comprehensive processing on the analysis result of the full current test value, the analysis result of the angle test value and the analysis result of the resistive current test value;
4.1 when "full current test value analysis result = excellent", and "angle test value analysis result = excellent", and "resistive current test value analysis result = excellent", send intelligent decision information: normally, "each state quantity is stable and within the standard limit specified by the procedure, the device can run normally";
4.2 when "full current test value analysis result = good", and "angle test value analysis result = good", and "resistive current test value analysis result = good", push intelligent decision information: note that "the trend of the single-phase state quantity changes towards the direction close to the standard limit, but the standard limit is not exceeded, the equipment can still continue to operate, but the monitoring in operation should be enhanced";
4.3 when the "full current test value analysis result = poor", or the "angle test value analysis result = poor", or the "resistive current test value analysis result = poor", the intelligent decision information is pushed: abnormal condition, "the single important state quantity changes greatly and approaches or slightly exceeds the standard limit value, the equipment should monitor the operation in a key way and arrange power failure maintenance in due time";
4.4 when "full current test value analysis result = poor", and "angle test value analysis result = poor", and "resistive current test value analysis result = poor", push intelligent decision information: seriously, "single important state quantity seriously exceeds the standard limit value, the equipment should be scheduled to be overhauled in power failure as soon as possible";
s5: sending the lightning arrester decision information
5.1 displaying by liquid crystal: the client software is operated through a client computer connected with the analysis platform server, real-time data, intelligent analysis and decision information are displayed on a liquid crystal screen of the client software, and real-time curve display and historical curve query can be carried out;
5.2 prompting by voice: except for the liquid crystal display of the decision information at the client, if the decision information is in an abnormal or serious state, the sound alarm is automatically started, the alarm sound is continuously played along with the release of the decision information to remind the user to check the decision information, and the alarm sound can be eliminated only after the decision information is determined by the user.
5.3 sending by mobile phone short message: the user can obtain the decision information through the client and can also obtain the decision information through a mobile phone short message; a user logs in background software by using a client super user to add and set a mobile phone short message receiving number; the setting information includes: the lightning arrester short message sending method comprises the following steps of user name, mobile phone number, sending time interval and sending frequency, when lightning arrester background software generates decision information, the background software also carries out short message group sending on short message receiving numbers, and the short message content comprises the following steps: the name of the transformer station, the name of the line, the occurrence time, the total current of the lightning arrester,
Resistive current, angle, decision information.
In step S1, current sensor and collection board are revealed including A phase leakage current sensor, B phase leakage current sensor, C phase leakage current sensor to collection board to collection module, A phase leakage current sensor, B phase leakage current sensor and C phase leakage current sensor will monitor give collection board, collection board will reveal the electric current and sample to loop through ARM board and the analysis platform on the wireless thing networking GPRS network transmission of 4G communication module to the cloud server of distant place with the analog to digital conversion value, current sensor is revealed to A phase leakage current sensor, B phase leakage current sensor, C phase leakage current sensor, collection board, ARM board and 4G communication module all are connected with the power.
The acquisition unit is also provided with an arrester reference voltage wiring terminal U, and U-1 is used for inputting an arrester reference voltage A/B/C phase; u-2, inputting an arrester reference voltage N phase, connecting the A phase leakage current sensor with an A phase arrester leakage current sensor wiring terminal IA, wherein the power supply of the A phase arrester leakage current sensor is +12V input in IA-1; in IA-2, a power supply of a leakage current sensor of the A-phase lightning arrester is input at-12V; in IA-3, the leakage current sensor of the A-phase lightning arrester supplies power to the power supply with 0V input; the current input of the leakage current sensor of the A-phase lightning arrester is IA-4; the B-phase leakage current sensor is connected with a B-phase lightning arrester leakage current sensor wiring terminal IB, wherein IB-1 is the +12V input of a power supply of the B-phase lightning arrester leakage current sensor; IB-2, inputting power supply of a leakage current sensor of the B-phase lightning arrester by-12V; IB-3, inputting the power supply of the leakage current sensor of the B-phase lightning arrester by 0V; IB-4, inputting the current of a leakage current sensor of the B-phase lightning arrester; the C-phase leakage current sensor is connected with a C-phase lightning arrester leakage current sensor wiring terminal IC, wherein the power supply of the C-phase lightning arrester leakage current sensor is +12V input in IC-1; IC-2, a power supply of a C-phase lightning arrester leakage current sensor is input at-12V; IC-3, the power supply of the leakage current sensor of the C-phase lightning arrester is input by 0V; and (4) inputting the current of the leakage current sensor of the IC-4C-phase lightning arrester.
The invention has the following positive beneficial effects:
1. the invention discloses a method for analyzing resistive current and harmonic current of a lightning arrester, which comprises the steps of acquiring information of the lightning arrester → calculating data of the lightning arrester → intelligently analyzing the lightning arrester → intelligently deciding the lightning arrester → sending decision information of the lightning arrester, wherein after the total current, the angle and the resistive current of the lightning arrester are respectively analyzed, the health condition of the lightning arrester is comprehensively analyzed, a decision report is automatically generated and sent, the manual judgment of operation and maintenance personnel is facilitated, the data measurement accuracy is improved, and the operation and maintenance intellectualization and informatization are improved.
2. The lightning arrester real-time state monitoring system can acquire data in real time, can acquire comprehensive data every 5 minutes, can know the change rule of the real-time state of the lightning arrester in every day, every week, every quarter and every year through data and curves, establishes a lightning arrester feature library by combining information of a bus voltage value, temperature and humidity, a lightning arrester manufacturer and the like, continuously expands the feature library, and brings convenience to subsequent judgment work.
3. The lightning arrester monitoring system realizes real-time monitoring and analysis of the running state of the lightning arrester by acquiring, analyzing and processing all data of the resistive current, the harmonic wave and the like of the lightning arrester in real time, gives an alarm in time when a problem is found, enables maintainers to operate in a targeted manner, improves the working efficiency and lightens the labor intensity.
4. The invention can ensure the safe operation of the main equipment and improve the power supply reliability of the whole power grid; the device can replace the field live test and the power failure test of the lightning arrester, reduce the direct economic loss caused by power failure, the field monitoring device only has magnetic connection with primary equipment, does not have electric connection, does not change any wiring and operation mode of the original equipment during installation, does not cause any interference and influence on the primary system, and has high safety.
5. The system adopts unified shielding, has the function of shielding the leakage current of the lightning arrester, ensures the normal operation of the whole system under the severe electromagnetic environment, and has strong anti-interference performance.
Drawings
FIG. 1 is a schematic flow chart of a method for analyzing resistive current and harmonic current of a lightning arrester according to the present invention;
FIG. 2 is a diagram of a leakage current system for analyzing the resistive current and the harmonic current of the lightning arrester according to the present invention;
FIG. 3 is a diagram of the internal structure of a stainless steel box in the method for analyzing the resistive current and the harmonic current of the lightning arrester according to the present invention;
FIG. 4 is a connection block diagram of the collecting module in the method for analyzing the resistive current and the harmonic current of the lightning arrester according to the present invention;
FIG. 5 is a diagram of FFT data collected in the method for analyzing resistive current and harmonic current of a lightning arrester according to the present invention;
FIG. 6 is a diagram of FFT time domain waveforms in the method for analyzing resistive current and harmonic current of a lightning arrester according to the present invention;
FIG. 7 is a diagram showing the effect of the superposition of the value vectors at the same frequency point in the FFT spectrum according to the method for analyzing the resistive current and the harmonic current of the lightning arrester of the present invention;
fig. 8 is a diagram of a single-period 512-point FFT physical resolution sinusoidal signal of arrester leakage current in the method for analyzing arrester resistive current and harmonic current according to the present invention;
fig. 9 is a diagram of the relationship between resistive current and total current in the method for analyzing resistive current and harmonic current of a lightning arrester according to the present invention.
Detailed Description
The invention will be further explained and explained with reference to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9 and the following detailed description:
example (b): a method for analyzing resistive current and harmonic current of a lightning arrester comprises the following steps:
s1: acquiring an online monitoring signal of the arrester and inputting arrester nameplate information on a transformer substation site;
collecting an online monitoring signal of the lightning arrester: the method comprises the following steps that an arrester online monitoring stainless steel box body is installed on an arrester pillar at intervals, a wiring groove, an acquisition module, a power supply module, a communication module and an air switch are arranged in the box body, an arrester leakage current sensor is connected between an arrester base and a counter in series, arrester leakage current is converted into a secondary signal and is input to the acquisition module in the arrester online monitoring stainless steel box through a current sensor cable, the acquisition module in the box body samples the leakage current, and an analog-to-digital conversion value is transmitted to an analysis platform on a remote cloud server through a 4G wireless Internet of things GPRS network;
inputting lightning arrester nameplate information: inputting information such as a transformer substation name, a line number, a lightning arrester type, a model, a voltage grade, a rated voltage, a continuous operation voltage, a manufacturer, production time, input operation time, service life, remarks and the like into an analysis platform in a transformer substation field photographing mode, a PMS information exporting mode and a file inquiring mode;
s2: the analysis platform calculates the acquired voltage and current data as follows:
1) FFT computation
The analysis platform selects 512-point FFT sinusoidal signals of a lightning arrester leakage current single period to carry out A/D sampling according to the amplitude values of current and voltage, then FFT calculation is carried out, and ADS8558 of TI company is selected by the A/D sampling;
the FFT implementation method comprises the following steps: the operation result is a vector with phase information, and the acquired FFT data not only comprises amplitude information but also comprises phase information; the phase of each signal frequency component determines the specific waveform of the signal in the time domain; the physical resolution of the FFT is: sampling rate/number of sampling points, and the frequency of the analysis signal is integral multiple of the value;
2) full current calculation
The total current effective value only contains fundamental wave, 3-order, 5-order and 7-order harmonic waves, and the calculation formula is as follows:
Ix=
3) resistive current calculation
The calculation formula is as follows:
Ir= Ix cosΦ
wherein Ix is total current, Ir is resistive current, and the phi value is measured by a circuit board;
s3: analyzing and judging the arrester data acquired in real time, automatically comparing the data with the standard limit value of each arrester in each transformer substation, and judging whether the data exceed the standard limit value, so that the state of the single-phase arrester can be sensed;
1) analyzing a full current test value, and judging according to the following steps:
1.1 when the total current test value is less than or equal to the total current standard limit value multiplied by 40 percent, the data of the total current test value is interfered;
1.2 when the full current standard limit value is multiplied by 40 percent and the full current test value is less than or equal to the full current standard limit value is multiplied by 70 percent, the state of the full current test value is excellent;
1.3 when the full current standard limit value is multiplied by 70 percent and the full current test value is less than or equal to the full current standard limit value and multiplied by 100 percent, the state of the full current test value is good;
1.4 when the full current test value is larger than the full current standard limit value multiplied by 100 percent, the state of the full current test value is poor;
2) analyzing an angle test value, and judging according to the following steps:
2.1 when the angle test value is more than or equal to 90 degrees, the angle test value data is interfered;
2.2 when the angle test value is more than 85 degrees and less than or equal to 90 degrees, the angle test value state is excellent;
2.3 when the angle test value is more than 75 degrees and less than or equal to 85 degrees, the angle test value state is good;
2.4 when the angle test value is less than or equal to 75 degrees, the state of the angle test value is poor;
3) analyzing a resistive current test value, and judging according to the following steps:
3.1 when the resistive current test value is less than or equal to the resistive current standard limit value multiplied by 40 percent, the data of the resistive current test value is interfered;
3.2 when the resistive current standard limit value is multiplied by 40 percent and the resistive current test value is less than or equal to the resistive current standard limit value and multiplied by 70 percent, the state of the resistive current test value is excellent;
3.3 when the resistive current standard limit value is multiplied by 70 percent and the resistive current test value is less than or equal to the resistive current standard limit value and multiplied by 100 percent, the state of the resistive current test value is good;
3.4 when the resistive current test value is larger than the resistive current standard limit value multiplied by 100 percent, the state of the resistive current test value is poor;
s4: the lightning arrester analysis platform carries out intelligent decision according to the data, and the intelligent decision carries out comprehensive processing on the analysis result of the full current test value, the analysis result of the angle test value and the analysis result of the resistive current test value;
4.1 when "full current test value analysis result = excellent", and "angle test value analysis result = excellent", and "resistive current test value analysis result = excellent", send intelligent decision information: normally, "each state quantity is stable and within the standard limit specified by the procedure, the device can run normally";
4.2 when "full current test value analysis result = good", and "angle test value analysis result = good", and "resistive current test value analysis result = good", push intelligent decision information: note that "the trend of the single-phase state quantity changes towards the direction close to the standard limit, but the standard limit is not exceeded, the equipment can still continue to operate, but the monitoring in operation should be enhanced";
4.3 when the "full current test value analysis result = poor", or the "angle test value analysis result = poor", or the "resistive current test value analysis result = poor", the intelligent decision information is pushed: abnormal condition, "the single important state quantity changes greatly and approaches or slightly exceeds the standard limit value, the equipment should monitor the operation in a key way and arrange power failure maintenance in due time";
4.4 when "full current test value analysis result = poor", and "angle test value analysis result = poor", and "resistive current test value analysis result = poor", push intelligent decision information: seriously, "single important state quantity seriously exceeds the standard limit value, the equipment should be scheduled to be overhauled in power failure as soon as possible";
s5: sending the lightning arrester decision information
5.1 displaying by liquid crystal: the client software is operated through a client computer connected with the analysis platform server, real-time data, intelligent analysis and decision information are displayed on a liquid crystal screen of the client software, and real-time curve display and historical curve query can be carried out;
5.2 prompting by voice: except for the liquid crystal display of the decision information at the client, if the decision information is in an abnormal or serious state, the sound alarm is automatically started, the alarm sound is continuously played along with the release of the decision information to remind the user to check the decision information, and the alarm sound can be eliminated only after the decision information is determined by the user.
5.3 sending by mobile phone short message: the user can obtain the decision information through the client and can also obtain the decision information through a mobile phone short message; a user logs in background software by using a client super user to add and set a mobile phone short message receiving number; the setting information includes: the lightning arrester short message sending method comprises the following steps of user name, mobile phone number, sending time interval and sending frequency, when lightning arrester background software generates decision information, the background software also carries out short message group sending on short message receiving numbers, and the short message content comprises the following steps: the name of the transformer station, the name of the line, the occurrence time, the total current of the lightning arrester,
Resistive current, angle, decision information.
In step S1, the acquisition module includes an a-phase leakage current sensor, a B-phase leakage current sensor, a C-phase leakage current sensor and an acquisition board, the a-phase leakage current sensor, the B-phase leakage current sensor and the C-phase leakage current sensor transmit the monitored leakage current to the acquisition board, the acquisition board samples the leakage current and transmits the analog-to-digital conversion value to the analysis platform on the remote cloud server via the ARM board and the 4G communication module in sequence via the wireless internet of things GPRS network, and the a-phase leakage current sensor, the B-phase leakage current sensor, the C-phase leakage current sensor, the acquisition board, the ARM board and the 4G communication module are all connected to the power supply.
The acquisition unit is also provided with an arrester reference voltage wiring terminal U, and U-1 is used for inputting the arrester reference voltage A/B/C phase; u-2, inputting an arrester reference voltage N phase, connecting an A phase leakage current sensor with an A phase arrester leakage current sensor wiring terminal IA, wherein the power supply of the A phase arrester leakage current sensor is +12V input in IA-1; in IA-2, a power supply of a leakage current sensor of the A-phase lightning arrester is input at-12V; in IA-3, the leakage current sensor of the A-phase lightning arrester supplies power to the power supply with 0V input; the current input of the leakage current sensor of the A-phase lightning arrester is IA-4; the B-phase leakage current sensor is connected with a B-phase lightning arrester leakage current sensor wiring terminal IB, wherein IB-1 is the power supply +12V input of the B-phase lightning arrester leakage current sensor; IB-2, inputting power supply of a leakage current sensor of the B-phase lightning arrester by-12V; IB-3, inputting the power supply of the leakage current sensor of the B-phase lightning arrester by 0V; IB-4, inputting the current of a leakage current sensor of the B-phase lightning arrester; the C-phase leakage current sensor is connected with a C-phase lightning arrester leakage current sensor wiring terminal IC, wherein IC-1 is the power supply +12V input of the C-phase lightning arrester leakage current sensor; IC-2, a power supply of a C-phase lightning arrester leakage current sensor is input at-12V; IC-3, the power supply of the leakage current sensor of the C-phase lightning arrester is input by 0V; and (4) inputting the current of the leakage current sensor of the IC-4C-phase lightning arrester.
During operation, information acquisition is automatically carried out on the arrester, arrester data calculation is carried out according to acquired data after acquisition is finished, intelligent analysis is carried out on the arrester after calculation is finished, an intelligent arrester decision is made according to an analysis result, and arrester decision information is sent finally.
Claims (3)
1. A method for analyzing resistive current and harmonic current of a lightning arrester comprises the following steps:
s1: acquiring an online monitoring signal of the arrester and inputting arrester nameplate information on a transformer substation site;
collecting an online monitoring signal of the lightning arrester: the method comprises the following steps that an arrester online monitoring stainless steel box body is installed on an arrester pillar at intervals, a wiring groove, an acquisition module, a power supply module, a communication module and an air switch are arranged in the box body, an arrester leakage current sensor is connected between an arrester base and a counter in series, arrester leakage current is converted into a secondary signal and is input to the acquisition module in the arrester online monitoring stainless steel box through a current sensor cable, the acquisition module in the box body samples the leakage current, and an analog-to-digital conversion value is transmitted to an analysis platform on a remote cloud server through a 4G wireless Internet of things GPRS network;
inputting lightning arrester nameplate information: inputting information such as a transformer substation name, a line number, a lightning arrester type, a model, a voltage grade, a rated voltage, a continuous operation voltage, a manufacturer, production time, input operation time, service life, remarks and the like into an analysis platform in a transformer substation field photographing mode, a PMS information exporting mode and a file inquiring mode;
s2: the analysis platform calculates the acquired voltage and current data as follows:
1) FFT computation
The analysis platform selects 512-point FFT sinusoidal signals of a lightning arrester leakage current single period to carry out A/D sampling according to the amplitude values of current and voltage, then FFT calculation is carried out, and ADS8558 of TI company is selected by the A/D sampling;
the FFT implementation method comprises the following steps: the operation result is a vector with phase information, and the acquired FFT data not only comprises amplitude information but also comprises phase information; the phase of each signal frequency component determines the specific waveform of the signal in the time domain; the physical resolution of the FFT is: sampling rate/number of sampling points, and the frequency of the analysis signal is integral multiple of the value;
2) full current calculation
The total current effective value only contains fundamental wave, 3-order, 5-order and 7-order harmonic waves, and the calculation formula is as follows:
Ix=
3) resistive current calculation
The calculation formula is as follows:
Ir= Ix cosΦ
wherein Ix is total current, Ir is resistive current, and the phi value is measured by a circuit board;
s3: analyzing and judging the arrester data acquired in real time, automatically comparing the data with the standard limit value of each arrester in each transformer substation, and judging whether the data exceed the standard limit value, so that the state of the single-phase arrester can be sensed;
1) analyzing a full current test value, and judging according to the following steps:
1.1 when the total current test value is less than or equal to the total current standard limit value multiplied by 40 percent, the data of the total current test value is interfered;
1.2 when the full current standard limit value is multiplied by 40 percent and the full current test value is less than or equal to the full current standard limit value is multiplied by 70 percent, the state of the full current test value is excellent;
1.3 when the full current standard limit value is multiplied by 70 percent and the full current test value is less than or equal to the full current standard limit value and multiplied by 100 percent, the state of the full current test value is good;
1.4 when the full current test value is larger than the full current standard limit value multiplied by 100 percent, the state of the full current test value is poor;
2) analyzing an angle test value, and judging according to the following steps:
2.1 when the angle test value is more than or equal to 90 degrees, the angle test value data is interfered;
2.2 when the angle test value is more than 85 degrees and less than or equal to 90 degrees, the angle test value state is excellent;
2.3 when the angle test value is more than 75 degrees and less than or equal to 85 degrees, the angle test value state is good;
2.4 when the angle test value is less than or equal to 75 degrees, the state of the angle test value is poor;
3) analyzing a resistive current test value, and judging according to the following steps:
3.1 when the resistive current test value is less than or equal to the resistive current standard limit value multiplied by 40 percent, the data of the resistive current test value is interfered;
3.2 when the resistive current standard limit value is multiplied by 40 percent and the resistive current test value is less than or equal to the resistive current standard limit value and multiplied by 70 percent, the state of the resistive current test value is excellent;
3.3 when the resistive current standard limit value is multiplied by 70 percent and the resistive current test value is less than or equal to the resistive current standard limit value and multiplied by 100 percent, the state of the resistive current test value is good;
3.4 when the resistive current test value is larger than the resistive current standard limit value multiplied by 100 percent, the state of the resistive current test value is poor;
s4: the lightning arrester analysis platform carries out intelligent decision according to the data, and the intelligent decision carries out comprehensive processing on the analysis result of the full current test value, the analysis result of the angle test value and the analysis result of the resistive current test value;
4.1 when "full current test value analysis result = excellent", and "angle test value analysis result = excellent", and "resistive current test value analysis result = excellent", send intelligent decision information: normally, "each state quantity is stable and within the standard limit specified by the procedure, the device can run normally";
4.2 when "full current test value analysis result = good", and "angle test value analysis result = good", and "resistive current test value analysis result = good", push intelligent decision information: note that "the trend of the single-phase state quantity changes towards the direction close to the standard limit, but the standard limit is not exceeded, the equipment can still continue to operate, but the monitoring in operation should be enhanced";
4.3 when the "full current test value analysis result = poor", or the "angle test value analysis result = poor", or the "resistive current test value analysis result = poor", the intelligent decision information is pushed: abnormal condition, "the single important state quantity changes greatly and approaches or slightly exceeds the standard limit value, the equipment should monitor the operation in a key way and arrange power failure maintenance in due time";
4.4 when "full current test value analysis result = poor", and "angle test value analysis result = poor", and "resistive current test value analysis result = poor", push intelligent decision information: seriously, "single important state quantity seriously exceeds the standard limit value, the equipment should be scheduled to be overhauled in power failure as soon as possible";
s5: sending the lightning arrester decision information
5.1 displaying by liquid crystal: the client software is operated through a client computer connected with the analysis platform server, real-time data, intelligent analysis and decision information are displayed on a liquid crystal screen of the client software, and real-time curve display and historical curve query can be carried out;
5.2 prompting by voice: the decision information is displayed on a liquid crystal display at a client, if the decision information is in an abnormal or serious state, a sound alarm is automatically started, an alarm sound is continuously played along with the release of the decision information to remind a user to check the decision information, and the alarm sound can be eliminated only when the decision information is determined by the user;
5.3 sending by mobile phone short message: the user can obtain the decision information through the client and can also obtain the decision information through a mobile phone short message; a user logs in background software by using a client super user to add and set a mobile phone short message receiving number; the setting information includes: the lightning arrester short message sending method comprises the following steps of user name, mobile phone number, sending time interval and sending frequency, when lightning arrester background software generates decision information, the background software also carries out short message group sending on short message receiving numbers, and the short message content comprises the following steps: the name of the transformer station, the name of the line, the occurrence time, the total current of the lightning arrester,
Resistive current, angle, decision information.
2. The method for analyzing resistive current and harmonic current of a lightning arrester according to claim 1, wherein: in step S1, current sensor and collection board are revealed including A phase leakage current sensor, B phase leakage current sensor, C phase leakage current sensor to collection board to collection module, A phase leakage current sensor, B phase leakage current sensor and C phase leakage current sensor will monitor give collection board, collection board will reveal the electric current and sample to loop through ARM board and the analysis platform on the wireless thing networking GPRS network transmission of 4G communication module to the cloud server of distant place with the analog to digital conversion value, current sensor is revealed to A phase leakage current sensor, B phase leakage current sensor, C phase leakage current sensor, collection board, ARM board and 4G communication module all are connected with the power.
3. The method for analyzing resistive current and harmonic current of a lightning arrester according to claim 2, characterized by: the acquisition unit is also provided with an arrester reference voltage wiring terminal U, and U-1 is used for inputting an arrester reference voltage A/B/C phase; u-2, inputting an arrester reference voltage N phase, connecting the A phase leakage current sensor with an A phase arrester leakage current sensor wiring terminal IA, wherein the power supply of the A phase arrester leakage current sensor is +12V input in IA-1; in IA-2, a power supply of a leakage current sensor of the A-phase lightning arrester is input at-12V; in IA-3, the leakage current sensor of the A-phase lightning arrester supplies power to the power supply with 0V input; the current input of the leakage current sensor of the A-phase lightning arrester is IA-4; the B-phase leakage current sensor is connected with a B-phase lightning arrester leakage current sensor wiring terminal IB, wherein IB-1 is the +12V input of a power supply of the B-phase lightning arrester leakage current sensor; IB-2, inputting power supply of a leakage current sensor of the B-phase lightning arrester by-12V; IB-3, inputting the power supply of the leakage current sensor of the B-phase lightning arrester by 0V; IB-4, inputting the current of a leakage current sensor of the B-phase lightning arrester; the C-phase leakage current sensor is connected with a C-phase lightning arrester leakage current sensor wiring terminal IC, wherein the power supply of the C-phase lightning arrester leakage current sensor is +12V input in IC-1; IC-2, a power supply of a C-phase lightning arrester leakage current sensor is input at-12V; IC-3, the power supply of the leakage current sensor of the C-phase lightning arrester is input by 0V; and (4) inputting the current of the leakage current sensor of the IC-4C-phase lightning arrester.
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