CN107631863B - high-voltage circuit breaker mechanical characteristic monitoring system and monitoring method thereof - Google Patents
high-voltage circuit breaker mechanical characteristic monitoring system and monitoring method thereof Download PDFInfo
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- CN107631863B CN107631863B CN201710720077.XA CN201710720077A CN107631863B CN 107631863 B CN107631863 B CN 107631863B CN 201710720077 A CN201710720077 A CN 201710720077A CN 107631863 B CN107631863 B CN 107631863B
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Abstract
The invention discloses a mechanical characteristic monitoring system of a high-voltage circuit breaker, which comprises a monitoring terminal microcontroller, wherein the monitoring terminal microcontroller is respectively connected with an RTC real-time clock module, a crystal oscillator, a Flash module, an SRAM module, a watchdog module and a wireless transceiving module, and the wireless transceiving module is connected with a contact temperature rise monitoring terminal; the monitoring terminal microcontroller is connected with the signal sensor through the ADC module; the monitoring terminal microcontroller, the contact temperature rise monitoring terminal and the signal sensor are all connected with the power supply module; the monitoring terminal microcontroller is connected with the human-computer interaction module through the CAN module and is also connected with the monitoring center through the Ethernet module. The invention also discloses a method for monitoring the mechanical characteristics of the high-voltage circuit breaker by using the monitoring system. The high-voltage circuit breaker mechanical characteristic monitoring system and the monitoring method thereof can realize the monitoring of the running state of the high-voltage circuit breaker and solve the problems of incomplete monitoring and low precision of the existing high-voltage circuit breaker.
Description
Technical Field
The invention belongs to the technical field of on-line monitoring of power transformation equipment, relates to a high-voltage circuit breaker mechanical characteristic monitoring system, and further relates to a method for monitoring the mechanical characteristic of a high-voltage circuit breaker by using the monitoring system.
background
high-voltage circuit breakers are the most critical primary electrical devices in switch electronics as insulation and arc extinction. When equipment and lines have faults, the high-voltage circuit breaker can quickly remove and isolate the faults, and normal operation of non-fault users is guaranteed. When the high-voltage circuit breaker breaks down, a fault line or equipment cannot be cut off at the first time, immeasurable damage to a power system and user equipment can be caused, and even hidden danger is brought to the safety of workers.
At present, high-voltage circuit breaker monitoring devices adopted at home and abroad are difficult to systematically and comprehensively predict the overall running state of a high-voltage circuit breaker due to insufficient quantity of sensors, incomplete monitoring parameters and the like; meanwhile, due to the singleness of the adopted data processing technology, the collected mechanical characteristic parameters still have larger interference and are difficult to filter, so that the parameters obtained by the online mechanical characteristic monitoring device of the high-voltage circuit breaker cannot accurately reflect the real-time running state of the high-voltage circuit breaker, and even false alarms, false actions and the like can occur.
how to comprehensively monitor the state of the high-voltage circuit breaker according to the existing parameters and how to reduce the interference signals to the minimum by adopting a more efficient and comprehensive data processing technology, so that the improvement of the precision and the reliability of the state monitoring of the high-voltage circuit breaker is a difficult point existing in the fault diagnosis technology of the high-voltage circuit breaker. Therefore, the existing on-line monitoring technology of the high-voltage circuit breaker needs to be further improved so as to realize accurate monitoring of the working state of the high-voltage circuit breaker.
disclosure of Invention
the invention aims to provide a high-voltage circuit breaker mechanical characteristic monitoring system, which can realize monitoring of the running state of a high-voltage circuit breaker and solve the problems of incomplete monitoring and low precision of the existing high-voltage circuit breaker.
The invention also aims to provide a method for monitoring the mechanical characteristics of the high-voltage circuit breaker by using the monitoring system, which adopts a plurality of data processing algorithms to process the collected characteristic parameters, has high operation precision and can reduce or even eliminate false alarm and misoperation of the high-voltage circuit breaker failure.
The first technical scheme adopted by the invention is that the mechanical characteristic monitoring system of the high-voltage circuit breaker comprises a monitoring terminal microcontroller, wherein the monitoring terminal microcontroller is respectively connected with an RTC real-time clock module, a crystal oscillator, a Flash module, an SRAM module, a watchdog module and a wireless transceiving module, and the wireless transceiving module is connected with a contact temperature rise monitoring terminal; the monitoring terminal microcontroller is connected with the signal sensor through the ADC module; the monitoring terminal microcontroller, the contact temperature rise monitoring terminal and the signal sensor are all connected with the power supply module; the monitoring terminal microcontroller is connected with the human-computer interaction module through the CAN module and is also connected with the monitoring center through the Ethernet module.
the first technical scheme of the invention is also characterized in that:
The ADC module and the RTC real-time clock module are embedded in the monitoring terminal microcontroller.
The monitoring terminal microcontroller adopts an STM32F407ZGT6 chip.
the wireless receiving and transmitting module is a 433MHz wireless receiving and transmitting module.
the signal sensor comprises a linear optocoupler connected with the ADC module, the linear optocoupler is connected with a signal conditioning circuit, and the signal conditioning circuit is respectively connected with a linear displacement sensor and a Hall current transformer; the three linear displacement sensors are respectively arranged in an A, B, C three-phase contact mechanical structure of the high-voltage circuit breaker and used for monitoring the action information of each phase of moving contact; the three Hall current transformers are used for respectively collecting closing coil action current, opening coil action current and energy storage motor action current.
The contact temperature rise monitoring terminal comprises a single chip microcomputer minimum system connected with a wireless transceiver module, wherein the single chip microcomputer minimum system is respectively connected with an EEPROM (electrically erasable programmable read-only memory) and a plurality of optical coupling isolation modules, each optical coupling isolation module is externally connected with a temperature sensor, and each temperature sensor is connected with a phase upper contact of a high-voltage circuit breaker A.
the temperature sensor is a resistance type temperature sensor.
The second technical scheme adopted by the invention is a method for monitoring the mechanical characteristics of the high-voltage circuit breaker by using a mechanical characteristic monitoring system of the high-voltage circuit breaker, which is implemented according to the following steps:
step 1, respectively acquiring a three-phase contact stroke signal, a switching-on and switching-off coil current signal and an energy storage motor signal when a high-voltage circuit breaker acts by using a linear displacement sensor and a Hall current transformer; the method comprises the following steps of carrying out filtering amplification processing on signal values of respective channels through a signal conditioning circuit, then isolating the signal values by a linear optical coupler, then sending the signal values into a microcontroller of a monitoring terminal for sampling, and carrying out wavelet denoising processing on the obtained data, and specifically comprises the following steps:
based on all signals needing to be stored for reclosing, an embedded bit high-precision AD module is adopted, the sampling frequency of each analog channel is set to be 100KHz, and 30000 points of 3-second long-time action values are collected;
Step 1.1, judging the action type of the high-voltage circuit breaker according to a large array of 30000 points of each of six channels, and combining the actual operation condition of the high-voltage circuit breaker to divide into the following five conditions:
a) Opening a brake; b) switching on 0.3 second after switching off; c) switching on 0.3 second after switching off, and switching off again if a fault still exists; d) closing a switch; e) if a fault occurs after switching on, switching off;
classifying the data of the six analog acquisition channels according to the five conditions;
step 1.2, according to different action types of the high-voltage circuit breaker in the step 1.1, carrying out data interception on the six-way channel, and storing the intercepted signals into a set cache array, wherein the switching-off time generally does not exceed 50ms, the switching-on time generally does not exceed 100ms, the cache length of the switching-off data is set to be 100ms, namely 1000 points, and the cache length of the switching-on data is 150ms, namely 1500 points;
In order to process the situation c), the cache array is divided into two groups of a separating gate cache 0 and a separating gate cache 1;
Storing the data intercepted by the first brake-separating into a brake-separating cache 0, and storing the data intercepted by the second brake-separating into a brake-separating cache 1; all closing data are stored in a closing cache;
Step 1.3, performing wavelet de-noising processing on the intercepted data in the cache, and specifically determining a wavelet scale function as follows:
Step a, determining the number N of decomposition layers of wavelet de-noising, and selecting a wavelet threshold function;
b, after the step a is finished, selecting a polynomial P (y) PN(y)+yNR (1/2-y) is not less than 0, y is not less than 0 and not more than 1, wherein PN(y) satisfies R (-y) — R (y), and satisfies sup P (y) < 22(N-1)(ii) a Selecting a real coefficient trigonometric polynomial Q (z) such that P: (sin2(ω/2))＝|Q(eiω)|2(ii) a Selectingh in (1)kthe coefficient is the scale function;
c, after the step b is finished, substituting the coefficients into the corresponding scale functions to obtain the coefficients of the wavelet scale functions under different resolution frequencies;
d, after the step c is finished, setting the coefficient of the high-frequency component to be filtered to be zero, and eliminating the interference signal;
step e, after the step d is finished, adding the wavelet scale functions under the other resolution frequencies, reconstructing the wavelet signals, and finally obtaining signals after noise is filtered;
step 2, smoothing the data output in the step 1 by adopting a sliding average value method;
step 3, after the step 2, calculating the average opening speed, the closing speed, the maximum opening and closing speed, the energy storage time and the opening and closing time of the moving contact of the high-voltage circuit breaker, the different opening and closing time of the high-voltage circuit breaker and the different closing time of the high-voltage circuit breaker respectively, and specifically implementing according to the following method:
According to the definition of the parameters of the high-voltage circuit breaker, the average speed of the contact opening is the average speed of the moving contact in the front 6mm of the high-voltage circuit breaker opening; the average closing speed of the contact is the average closing speed of the moving contact in the whole closing stroke of the circuit breaker; the maximum opening and closing speed of the contact is the maximum speed of the whole stroke of the moving contact of the circuit breaker when the circuit breaker acts;
The method for calculating the average opening speed of the moving contact of the high-voltage circuit breaker comprises the following steps:
Finding a point of a high-voltage circuit breaker contact at the moment of 6mm, recording the time of the circuit breaker contact at the moment of 6mm as T, setting the moment of the initial action of the circuit breaker as 0, and then calculating the average opening speed of the moving contact of the high-voltage circuit breaker according to the formula: vOpen＝6/T；
the method for calculating the closing speed of the moving contact of the high-voltage circuit breaker comprises the following steps:
finding out the point of the action ending moment of the contact of the high-voltage circuit breaker, and recording the current stroke value as S4(ii) a Taking the initial position as the initial stroke value S3setting the initial time of the closing action of the high-voltage circuit breaker to be 0 and the closing ending time of the contact of the high-voltage circuit breaker to be tCloseThen, the calculation formula of the average closing speed of the moving contact of the high-voltage circuit breaker is as follows: vClose＝(S4-S3)/tClose；
The method for calculating the maximum opening and closing speed of the moving contact of the high-voltage circuit breaker comprises the following steps:
determining the calculation interval value of 5ms of stroke data, namely 50 points, setting the stroke value at the time t as a displacement value of S (t +50), and then determining the instantaneous speed V at the time ttthe formula is as follows:
taking 50 points as calculation step length, starting calculation from the 50 th point of the action of the high-voltage circuit breaker contact according to the formula (1-1), and calculating the moment until the moving contact of the high-voltage circuit breaker finishes the action to obtain the instantaneous speed value at each moment; in order to ensure that the finally obtained instantaneous speed values are accurate, the maximum 5 instantaneous speed values are found in the instantaneous speed values, a median method is adopted, and the value in the middle of the 5 maximum values is selected as the final movable contact opening and closing maximum speed value;
The RTC real-time clock module is adopted to calculate the energy storage time and the opening and closing time of the high-voltage circuit breaker, and the calculation process is as follows:
judging the opening and closing amount of a high-voltage circuit breaker opening, closing and energy storage motor in real time, controlling a monitoring terminal microcontroller to sequentially acquire time information of action starting and ending moments when the opening and closing operation of the high-voltage circuit breaker is finished or the energy storage motor starts to finish working, and obtaining the opening and closing time of the high-voltage circuit breaker and the working time of the energy storage motor by subtracting the time information of the action ending moment and the time information of the action starting moment;
according to the obtained division of the high-voltage circuit breakerthe switching time and the switching-on time, the time information obtained at the moment is respectively the information of the three-phase contact, namely TOPEN_A、TOPEN_B、TOPEN_COr TClose_A、TClose_B、TClose_Cthe first three items are respectively the switching-off time of A, B, C three-phase contacts, and the last three items are respectively the switching-on time of A, B, C three-phase contacts;
Carrying out difference on the three-phase opening time in pairs to obtain the opening different-phase time of A-B, the different-phase time of B-C and the opening different-phase time of C-A, and taking the maximum value of the three values to obtain the opening different-phase time of the high-voltage circuit breaker;
performing difference on the three-phase closing time in pairs to obtain the closing different-phase time of A-B, the closing phase time of B-C and the closing different-phase time of C-A, and taking the maximum value of the three values to obtain the closing different-phase time of the high-voltage circuit breaker;
step 4, after the step 3 is completed, monitoring the temperature rise condition of the high-voltage circuit breaker contact on line in a wireless transmission mode;
Step 5, after the steps 1 to 4, the monitoring terminal microcontroller obtains parameters of average speed and maximum speed of the opening and closing contacts in the opening and closing process, the opening different-phase time, the closing different-phase time, the maximum current of the opening and closing coils, the starting current of the energy storage motor, the opening and closing time and the contact temperature rise value; the data are stored through the Flash module, power failure loss is prevented, the data are uploaded to the human-computer interaction module through the CAN module to be displayed, and meanwhile, the data are uploaded to the monitoring center through the Ethernet module to be remotely monitored.
the second technical scheme of the invention is also characterized in that:
the step 2 is specifically implemented according to the following method:
setting data to be close to stable in a small section of interval M as a certain local average to reduce errors and noises, and continuously and locally averaging the N data along the full length one by one in the small section of interval M;
after the step 1, filling the obtained local average value serving as smoothed data into an original cache region, when the whole cache calculation is finished, making M-1 points incapable of being calculated, performing last averaging on the M-1 points and a previous point, and filling the average value obtained by calculation serving as a last value into the remaining M-1 positions in the cache region, so as to obtain all smoothed data;
the STM32F407 chip in the monitoring terminal microcontroller is used for summarizing and storing the data subjected to denoising and smoothing treatment, and then performing analysis calculation processing on the data, and finally obtaining the following data: the average speed and the maximum speed of the opening and closing contact in the opening and closing process, the maximum current of the opening and closing coil, the starting current of the energy storage motor, the opening and closing time and the contact temperature rise value.
step 4 is specifically implemented according to the following steps:
Step 4.1, temperature rise monitoring of the high-voltage circuit breaker senses temperature signals through a temperature sensor, the temperature sensor has the property of presenting different resistance values in different temperature environments, the temperature signals are converted into voltage signals after being converted through a Wheatstone bridge, temperature information of a contact of the high-voltage circuit breaker is obtained, the temperature information is converted into a level range which can be identified by a singlechip minimum system through isolation of an optical coupling isolation module, and the voltage value is read through the singlechip minimum system;
Step 4.2, after the step 4.1 is completed, after the minimum system of the single chip microcomputer reads a voltage value, according to the characteristics of the temperature sensor, looking up a table to obtain an actual temperature value of the contact of the high-voltage circuit breaker, and continuously reading the temperature value to perform data processing on the temperature value when the temperature is collected every time to obtain a more accurate temperature value;
The temperature data is processed by removing two highest values and two lowest values and calculating the average value of the remaining 6 data;
And 4.3, after the temperature data is obtained in the step 4.2, storing the temperature data and the time information through an EEPROM (electrically erasable programmable read-only memory), and sending the data to the monitoring terminal microcontroller through the wireless transceiver module.
the invention is also characterized in that:
(1) the high-voltage circuit breaker mechanical characteristic monitoring system can monitor the mechanical characteristics of the three-phase contact of the high-voltage circuit breaker, the temperature rise value of the three-phase contact, the current of the opening and closing coil, the current value of the energy storage motor and other parameters, thereby being capable of comprehensively and accurately judging the running state of the high-voltage circuit breaker;
(2) When the high-voltage circuit breaker mechanical characteristic monitoring system processes collected data, a wavelet denoising model is established, the high-voltage circuit breaker is considered to be possibly interfered by electromagnetic signals in the action process, and meanwhile, the phenomenon that the opening and closing curve generates noise in the action process due to the fact that the power supply is unstable caused by starting current of an energy storage motor in the action process is also considered; filtering the acquired signal when the high-voltage circuit breaker acts by adopting a wavelet denoising algorithm, and filtering out spike pulses and clutter to enable the sampled data to be more consistent with an actual value;
(3) in the process of monitoring by using the high-voltage circuit breaker mechanical characteristic monitoring system, when the collected data are processed, a smooth curve is obtained by adopting a sliding mean method, and the fact that the wavelet denoising algorithm cannot completely process all distortion points is considered, so that the data processed by the sliding mean method can be further optimized, and the precision of the data can be improved;
(4) in the process of monitoring by using the mechanical characteristic monitoring system of the high-voltage circuit breaker, when the collected data are processed, the speed value of the opening and closing of the contact of the circuit breaker is calculated by adopting a slope method and combining a median method, the slope (namely the speed) of a certain section of displacement is obtained by the slope method in consideration of the definition of the maximum speed of the high-voltage circuit breaker, then the maximum value is taken for the slope value, and the median value is taken for the maximum 5 slope values by adopting the median method, so that the more accurate maximum speed value is obtained;
(5) according to the high-voltage circuit breaker mechanical characteristic monitoring system, the high-voltage circuit breaker mechanical characteristic monitoring technology is combined with the high-voltage circuit breaker contact temperature rise monitoring technology, so that the running state of the high-voltage circuit breaker can be comprehensively monitored, and the problems of incomplete monitoring and low precision of the conventional high-voltage circuit breaker are solved; when the collected data are processed, the collected characteristic parameters are processed by adopting various data processing algorithms, the operation precision is high, and false alarm and misoperation of faults of the high-voltage circuit breaker can be reduced or even eliminated.
Drawings
fig. 1 is a schematic structural diagram of a mechanical characteristic monitoring system of a high-voltage circuit breaker according to the invention;
FIG. 2 is a schematic structural diagram of a terminal for monitoring temperature rise of a contact in the mechanical characteristic monitoring system of the high-voltage circuit breaker according to the invention;
FIG. 3 is a flow chart of wavelet denoising involved in the monitoring method of the present invention;
FIG. 4 is a flow chart of data processing by the sliding average method involved in the monitoring method of the present invention;
fig. 5 is a flow chart of calculating the maximum speed of the opening and closing contact by combining a slope method and a medium-value method high-voltage circuit breaker in the monitoring method of the invention.
In the figure, 1, a power supply module, 2, a monitoring terminal microcontroller, 3, a Flash module, 4, an SRAM module, 5, an RTC real-time clock module, 6, a watchdog module, 7, a CAN module, 8, an Ethernet module, 9, a crystal oscillator, 10, a wireless transceiving module, 11, a man-machine interaction module, 12, a linear displacement sensor, 13, a Hall current transformer, 14, a signal conditioning circuit, 15, a linear optical coupler, 16, a monitoring center, 17, a temperature sensor, 18, a singlechip minimum system, 19, an optical coupler isolation module, 20, an EEPROM memory, 21, a contact temperature rise monitoring terminal and 22, and a signal sensor.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a mechanical characteristic monitoring system of a high-voltage circuit breaker, which comprises a monitoring terminal microcontroller 2, wherein the monitoring terminal microcontroller 2 is respectively connected with an RTC real-time clock module 5, a crystal oscillator 9, a Flash module 3, an SRAM module 4, a watchdog module 6 and a wireless transceiving module 10, and the wireless transceiving module 10 is connected with a contact temperature rise monitoring terminal 21; the monitoring terminal microcontroller 2 is connected with the signal sensor 22 through an ADC module; the monitoring terminal microcontroller 2, the contact temperature rise monitoring terminal 21 and the signal sensor 22 are all connected with the power module 1; the monitoring terminal microcontroller 2 is connected with the man-machine interaction module 11 through the CAN module 7, and the monitoring terminal microcontroller 2 is further connected with the monitoring center 16 through the Ethernet module 8.
the monitoring terminal microcontroller 2 adopts an STM32F407ZGT6 chip which has a floating point operation function.
The ADC module is embedded in the monitoring terminal microcontroller 2, a high-precision AD module is adopted, the sampling frequency of each analog channel is set to be 100KHz, and 3-second long-time action values (30000 points) are collected.
The RTC real-time clock module 5 is embedded in the monitoring terminal microcontroller 2.
The power module 1 adopts a power supply mode of alternating current and direct current universal and mutual inductance energy obtaining.
the wireless transceiver module 10 is a 433MHz wireless transceiver module.
the signal sensor 22, as shown in fig. 1, includes a linear optocoupler 15 connected to the ADC module, the linear optocoupler 15 is connected to a signal conditioning circuit 14, and the signal conditioning circuit 14 is connected to the linear displacement sensor 12 and the hall current transformer 13, respectively. The three linear displacement sensors 12 are respectively installed in an A, B, C three-phase contact mechanical structure of the high-voltage circuit breaker and used for monitoring the action information of each phase of moving contact; three Hall current transformers 13 are arranged and respectively collect closing coil action current, opening coil action current and energy storage motor action current.
the contact temperature rise monitoring terminal 21, as shown in fig. 2, includes a minimum system 18 of a single chip microcomputer connected with the wireless transceiver module 10, the minimum system 18 of the single chip microcomputer is respectively connected with an EEPROM memory 20 and a plurality of optical coupling isolation modules 19, each optical coupling isolation module 19 is externally connected with a temperature sensor 17, and each temperature sensor 17 is connected with a phase upper contact of the high-voltage circuit breaker a.
the temperature sensor 17 is a resistance-type temperature sensor, and can convert the ambient temperature into the change of a resistance value, in order to ensure that the minimum system 18 of the single chip microcomputer can acquire correct voltage signals, a Wheatstone bridge is adopted to convert the change of the resistance value into the change of voltage, the front end and the rear end of the signal are isolated and protected by the optical coupling isolation module 19, and the temperature signal is converted into the level range which can be acquired by the minimum system 18 of the single chip microcomputer.
the main components in the mechanical characteristic monitoring system of the high-voltage circuit breaker have the following functions:
The power module 1: the power supply device is used for supplying power to the whole monitoring terminal controller 2 and the contact temperature rise monitoring terminal 21;
Monitoring terminal microcontroller 2: the functions of the whole system are realized, including: data sampling, data filtering, parameter operation, data communication and liquid crystal display functions;
a Flash module 3: the device is used for storing characteristic parameters and wave recording curve values finally obtained by the high-voltage circuit breaker and ensuring that system power-off data are not lost;
The SRAM module 4: the temporary buffer space is used for storing buffer data in the processes of data acquisition, data filtering and parameter calculation of the high-voltage circuit breaker;
the real-time clock module 5: the system is used for acquiring the opening time, closing time and action time of an energy storage motor of the high-voltage circuit breaker;
The wireless transceiver module 10: the contact temperature monitoring terminal is used for receiving and sending contact temperature rise data of the contact temperature rise monitoring terminal 21;
the CAN module 7: the CAN module is used for communicating with the human-computer interaction module 11, and is suitable for communication with large data volume due to the advantages of high communication speed and reliable communication;
The ethernet module 8: the Modbus protocol is used for communicating with upper computer software of the monitoring center 16 and can be embedded to carry out efficient and reliable data transmission;
A crystal oscillator 9: the normal work of the monitoring terminal microcontroller 2 can be ensured;
Watchdog module 6: preventing the program from being stuck or flying;
The man-machine interaction module 11: the device is used for displaying the real-time running state, the recording curve and the breaker parameter information of the high-voltage breaker, and is convenient for operators to overhaul and check;
linear displacement sensor 12 and hall current transformer 13: the device is used for acquiring a contact stroke signal of the high-voltage circuit breaker and a current signal of a coil motor;
The signal conditioning circuit 14: the device is used for amplifying and filtering signals acquired by the linear displacement sensor 12 and the Hall current transformer 13 to increase the resolution of the signals;
Linear optical coupler 15: the monitoring circuit is used for isolating signals of the analog circuit, increasing the stability of the signals and converting the signal level of the front end of the analog circuit into a level which can be accepted by the monitoring terminal microcontroller 2;
The monitoring center 16: the system is used as a background of the whole system and is responsible for remote control and real-time monitoring;
temperature sensor 17: used for obtaining the temperature value on the contact;
minimum system of singlechip 18: the temperature monitoring system is a microprocessor of the temperature rise monitoring terminal, and can sample, process and send temperature values to the monitoring terminal microcontroller 2 through the wireless transceiver module 10;
the optical coupling isolation module 19: the temperature sensor is used for isolating the temperature signal obtained by the temperature sensor and protecting the back end circuit;
the EEPROM memory 20: the temperature monitoring terminal is used for recording the temperature rise value of the three-phase contact of the high-voltage circuit breaker, which is obtained by the processing of the temperature rise monitoring terminal.
the high-voltage circuit breaker mechanical characteristic monitoring system disclosed by the invention is realized according to the following principle:
the obtained data is amplified by a signal conditioning circuit 14 through a linear displacement sensor 12 and a Hall current transformer 13, isolated by a linear optocoupler 15, converted into a level which can be accepted by a monitoring terminal microcontroller 2 and subjected to AD sampling;
the monitoring terminal microcontroller 2 stores the acquired data in an SRAM module 4, denoises through a corresponding wavelet denoising algorithm, calculates to obtain characteristic parameters and a recording curve of the high-voltage circuit breaker after processing through a sliding average value, stores the calculated parameters in a Flash module 3 for backup, and finally uploads the parameters to a human-computer interaction module 11 through a CAN module 7 or uploads the parameters to a monitoring center 16 through an Ethernet module 8.
The power supply module 1 is used for supplying power to the monitoring terminal microcontroller 2, the linear displacement sensor 12 and the Hall current transformer 13 and supplying power to the contact temperature rise monitoring terminal 21; the real-time clock module 5 is used for recording the specific time of the occurrence of the fault of the circuit breaker and simultaneously timing the time with the monitoring center 16 in real time; the watchdog module 6 can prevent the program from being stuck or running away; the CAN module 7 is communicated with the human-computer interaction module 11; the ethernet module 8 communicates with the monitoring center 16; the crystal oscillator 9 can ensure the normal work of the monitoring terminal microcontroller 2; the wireless transceiver module 10 is in data communication with the contact temperature rise monitoring terminal 21, and the human-computer interaction module 11 is used for displaying the current state of the circuit breaker, displaying a contact stroke curve, a switching-on/off coil current curve, a circuit breaker mechanical characteristic parameter, a circuit breaker contact temperature rise parameter and the like, and displaying an action log and a fault alarm record of the circuit breaker.
the method for monitoring the mechanical characteristics of the high-voltage circuit breaker by using the mechanical characteristic monitoring system of the high-voltage circuit breaker is implemented according to the following steps:
Step 1, respectively acquiring a three-phase contact stroke signal, a switching-on and switching-off coil current signal and an energy storage motor signal when a high-voltage circuit breaker acts by a linear displacement sensor 12 and a Hall current transformer 13; the signal values of the respective channels are filtered and amplified by a signal conditioning circuit 14, isolated by a linear optocoupler 15, sent into a monitoring terminal microcontroller 2 for sampling, and subjected to wavelet denoising processing, specifically implemented according to the following steps:
considering that all signals of reclosure need to be stored, an embedded 12-bit high-precision AD module is adopted, the sampling frequency of each analog channel is set to be 100KHz, and 3-second long-time action values (30000 points) are collected;
step 1.1, judging the action type of the high-voltage circuit breaker according to a large array of 30000 points of each of six channels, and combining the actual operation condition of the high-voltage circuit breaker to divide into the following five conditions:
a) Opening a brake; b) switching on 0.3 second after switching off; c) switching on 0.3 second after switching off, and switching off again if a fault still exists; d) closing a switch; e) if a fault occurs after switching on, switching off;
Classifying the data of the six analog acquisition channels according to the five conditions;
Step 1.2, according to different action types of the high-voltage circuit breaker in the step 1.1, carrying out data interception on the six-way channel, and storing the intercepted signals into a set cache array, wherein the switching-off time generally does not exceed 50ms, the switching-on time generally does not exceed 100ms, the cache length of the switching-off data is set to be 100ms (namely 1000 points), and the cache length of the switching-on data is set to be 150ms (1500 points);
at this time, in order to deal with the above case c), the cache array is divided into two groups, namely a separating gate cache 0 and a separating gate cache 1;
storing the data intercepted by the first brake-separating into a brake-separating cache 0, and storing the data intercepted by the second brake-separating into a brake-separating cache 1; all closing data are stored in a closing cache;
step 1.3, performing wavelet de-noising processing on the intercepted data in the cache, and specifically determining a wavelet scale function as follows, as shown in fig. 3:
step a, determining the number N of decomposition layers of wavelet de-noising, and selecting a wavelet threshold function;
b, after the step a is finished, selecting a polynomial P (y) PN(y)+yNr (1/2-y) is not less than 0, y is not less than 0 and not more than 1, wherein PN(y) satisfies R (-y) — R (y), and satisfies sup P (y) < 22(N-1)(ii) a Selecting a real coefficient trigonometric polynomial Q (z) such that P (sin)2(ω/2))＝|Q(eiω)|2(ii) a Selectingh in (1)kThe coefficient is the scale function;
c, after the step b is finished, substituting the coefficients into the corresponding scale functions to obtain the coefficients of the wavelet scale functions under different resolution frequencies;
d, after the step c is finished, setting the coefficient of the high-frequency component to be filtered to be zero, and eliminating the interference signal;
And e, after the step d is finished, adding the wavelet scale functions under the rest resolution frequencies, reconstructing the wavelet signals, and finally obtaining the signals with noise filtered.
in fact, the wavelet de-noised signal in step 1 still has noise which is partially difficult to eliminate, and in order to eliminate the random components, the data is smoothed and further filtered.
step 2, smoothing the data output in step 1 by using a sliding average method, as shown in fig. 4, the specific method is as follows:
setting data to be close to stable in a small section of interval M as a certain local average to reduce errors and noises, and continuously and locally averaging the N data along the full length one by one in the small section of interval M;
After the step 1, filling the obtained local average value serving as smoothed data into an original cache region, when the whole cache calculation is finished, making M-1 points incapable of being calculated, performing last averaging on the M-1 points and a previous point, and filling the average value obtained by calculation serving as a last value into the remaining M-1 positions in the cache region, so as to obtain all smoothed data;
the STM32F407 chip in the monitoring terminal microcontroller 2 is used for summarizing and storing the data subjected to denoising and smoothing, and then performing analysis and calculation processing on the data, and finally obtaining the data including: the average speed and the maximum speed of the opening and closing contact in the opening and closing process, the maximum current of the opening and closing coil, the starting current of the energy storage motor, the opening and closing time and the contact temperature rise value.
step 3, after the step 2, calculating the average opening speed, the closing speed, the maximum opening and closing speed, the energy storage time and the opening and closing time of the moving contact of the high-voltage circuit breaker, the different opening and closing time of the high-voltage circuit breaker and the different closing time of the high-voltage circuit breaker respectively, and specifically implementing according to the following method:
in the process of opening and closing actions of the high-voltage circuit breaker, the working performance of a contact needs to be obtained and is mainly reflected by the average opening and closing speed and the maximum opening and closing speed of the contact;
according to the definition of the parameters of the high-voltage circuit breaker, the average speed of the contact opening is the average speed of the moving contact in the front 6mm of the high-voltage circuit breaker opening; the average closing speed of the contact is the average closing speed of the moving contact in the whole closing stroke of the circuit breaker; the maximum opening and closing speed of the contact is the maximum speed of the whole stroke of the moving contact of the circuit breaker when the circuit breaker acts;
the method for calculating the average opening speed of the moving contact of the high-voltage circuit breaker comprises the following steps:
finding a point of a high-voltage circuit breaker contact at the moment of 6mm, recording the time of the circuit breaker contact at the moment of 6mm as T, setting the moment of the initial action of the circuit breaker as 0, and then calculating the average opening speed of the moving contact of the high-voltage circuit breaker according to the formula: vOpen＝6/T；
The method for calculating the closing speed of the moving contact of the high-voltage circuit breaker comprises the following steps:
finding out the point of the action ending moment of the contact of the high-voltage circuit breaker, and recording the current stroke value as S4(ii) a Taking the initial position as the initial stroke value S3Setting the initial time of the closing action of the high-voltage circuit breaker to be 0 and the closing ending time of the contact of the high-voltage circuit breaker to be tClosethen, the calculation formula of the average closing speed of the moving contact of the high-voltage circuit breaker is as follows: vClose＝(S4-S3)/tClose；
the method for calculating the maximum opening and closing speed of the moving contact of the high-voltage circuit breaker is shown in fig. 5 and specifically comprises the following steps:
determining the calculation interval value of 5ms (50 points) of the stroke data, setting the stroke value at the time t as the displacement value of S (t +50), and then determining the instantaneous speed V at the time ttThe formula is as follows:
taking 50 points as calculation step length, starting calculation from the 50 th point of the action of the high-voltage circuit breaker contact according to the formula (1-1), and calculating the moment until the moving contact of the high-voltage circuit breaker finishes the action, so as to obtain the instantaneous speed value at each moment; in order to ensure that the finally obtained instantaneous speed values are more accurate, the maximum 5 instantaneous speed values are found in the instantaneous speed values, a median method is adopted, and the value in the middle of the 5 maximum values is selected as the final moving contact opening and closing maximum speed value;
the RTC real-time clock module 5 is adopted to calculate the energy storage time and the opening and closing time of the high-voltage circuit breaker, and the calculation process is as follows:
judging the opening and closing amount of the high-voltage circuit breaker opening, closing and energy storage motor in real time, controlling the monitoring terminal microcontroller 2 to sequentially acquire time information of action starting and ending moments when the opening and closing operation of the high-voltage circuit breaker is finished or the energy storage motor starts to finish working, and obtaining the opening and closing time of the high-voltage circuit breaker and the working time of the energy storage motor by subtracting the time information of the action ending moment and the time information of the action starting moment;
According to the obtained opening time and closing time of the high-voltage circuit breaker, the obtained time information respectively comprises information (T) of three-phase contactsOPEN_A、TOPEN_B、TOPEN_Cor TClose_A、TClose_B、TClose_C) The first three items are respectively the switching-off time of A, B, C three-phase contacts, and the last three items are respectively the switching-on time of A, B, C three-phase contacts;
carrying out difference on the three-phase opening time in pairs to obtain the opening different-phase time of A-B, the different-phase time of B-C and the opening different-phase time of C-A, and taking the maximum value of the three values to obtain the opening different-phase time of the high-voltage circuit breaker;
And performing difference on the three-phase closing time in pairs to obtain the closing different-phase time of A-B, the closing phase time of B-C and the closing different-phase time of C-A, and taking the maximum value of the three values to obtain the closing different-phase time of the high-voltage circuit breaker.
step 4, after the step 3 is completed, adopting a wireless transmission mode to monitor the temperature rise condition of the high-voltage circuit breaker contact on line, and specifically implementing according to the following steps:
step 4.1, temperature rise monitoring of the high-voltage circuit breaker senses temperature signals through a temperature sensor 17, the temperature sensor 17 has the property of presenting different resistance values in different temperature environments, the temperature signals are converted into voltage signals through a Wheatstone bridge, temperature information of a contact of the high-voltage circuit breaker is obtained, the voltage signals are converted into a level range which can be identified by a singlechip minimum system 18 through isolation of an optical coupling isolation module 19, and the voltage value is read through the singlechip minimum system 18;
Step 4.2, after the step 4.1 is completed, after the single chip microcomputer minimum system 18 reads a voltage value, according to the characteristics of the temperature sensor 17, looking up a table to obtain an actual temperature value of the high-voltage circuit breaker contact, and continuously reading 10 groups of temperature values to perform data processing on the temperature values when the temperature is collected every time, so as to obtain a more accurate temperature value;
The temperature data is processed by removing two highest values and two lowest values and calculating the average value of the remaining 6 data;
and 4.3, after the temperature data is obtained in the step 4.2, storing the temperature data and the time information through the EEPROM 20, and sending the data to the monitoring terminal microcontroller 2 through the wireless transceiver module 10.
step 5, after the steps 1 to 4, the monitoring terminal microcontroller 2 obtains parameters of average speed and maximum speed of the opening and closing contacts in the opening and closing process, the opening different-phase time, the closing different-phase time, the maximum current of the opening and closing coils, the starting current of the energy storage motor, the opening and closing time and the contact temperature rise value; the data are stored through the Flash module 3, power failure loss is prevented, the data are uploaded to the human-computer interaction module 11 through the CAN module 7 to be displayed, and meanwhile, the data are uploaded to the monitoring center 16 through the Ethernet module 8 to be remotely monitored.
the intelligent monitoring system for the high-voltage circuit breaker provided by the invention is used for sampling the mechanical characteristics and the temperature rise value of the moving contact when the high-voltage circuit breaker acts, finally obtaining the characteristic parameters and the wave recording curve which CAN reflect the real-time running state of the high-voltage circuit breaker, and uploading the characteristic information to the man-machine interaction module 11 or the monitoring center 16 in a CAN (controller area network) or Ethernet mode. In order to ensure that the obtained characteristic information can accurately reflect the state of the high-voltage circuit breaker, the invention adopts a data processing technology based on a wavelet denoising algorithm and a sliding average algorithm to filter spike pulses caused by mechanical vibration or electric signal interference in the action process of the high-voltage circuit breaker, thereby ensuring the reliability and accuracy of later parameter calculation; meanwhile, the idea of solving the opening and closing speed of the high-voltage circuit breaker by combining a slope method with a median method is adopted, and the obtained opening and closing contact speed of the high-voltage circuit breaker is ensured to be more accurate.
according to the intelligent monitoring system for the high-voltage circuit breaker, the linear displacement sensor 12 is arranged below a three-phase moving contact of the high-voltage circuit breaker, the Hall current transformer 12 is connected in series with a primary loop of each of an opening coil, a closing coil and an energy storage motor of the high-voltage circuit breaker, the temperature sensors 17 are arranged on an upper contact and a lower contact of three phases, and the like, so that the displacement change of the three-phase contact of the high-voltage circuit breaker, the current change of the opening coil, the closing coil and the energy storage motor and the change condition of. According to the actual operation state of the high-voltage circuit breaker, the accurate calculation of the characteristic parameters of the high-voltage circuit breaker can be realized by combining a wavelet denoising method, a sliding average value method, a slope method, a median method and other data processing algorithms, and the purpose of accurately judging the fault diagnosis of the circuit breaker is achieved.
Claims (3)
1. The method for monitoring the mechanical characteristics of the high-voltage circuit breaker by using the mechanical characteristic monitoring system of the high-voltage circuit breaker is characterized in that the mechanical characteristic monitoring system of the high-voltage circuit breaker is adopted and comprises a monitoring terminal microcontroller (2), the monitoring terminal microcontroller (2) is respectively connected with an RTC real-time clock module (5), a crystal oscillator (9), a Flash module (3), an SRAM module (4), a watchdog module (6) and a wireless transceiving module (10), and the wireless transceiving module (10) is connected with a contact temperature rise monitoring terminal (21); the monitoring terminal microcontroller (2) is connected with the signal sensor (22) through an ADC module; the monitoring terminal microcontroller (2), the contact temperature rise monitoring terminal (21) and the signal sensor (22) are connected with the power module (1); the monitoring terminal microcontroller (2) is connected with the human-computer interaction module (11) through a CAN module (7), and the monitoring terminal microcontroller (2) is also connected with a monitoring center (16) through an Ethernet module (8);
the ADC module and the RTC real-time clock module (5) are embedded in the monitoring terminal microcontroller (2);
the monitoring terminal microcontroller (2) adopts an STM32F407ZGT6 chip;
The wireless transceiving module (10) is a 433MHz wireless transceiving module;
the signal sensor (22) comprises a linear optical coupler (15) connected with the ADC module, the linear optical coupler (15) is connected with a signal conditioning circuit (14), and the signal conditioning circuit (14) is respectively connected with a linear displacement sensor (12) and a Hall current transformer (13);
The three linear displacement sensors (12) are respectively arranged in an A, B, C three-phase contact mechanical structure of the high-voltage circuit breaker and used for monitoring the action information of each phase of moving contact;
three Hall current transformers (13) are arranged and are used for respectively collecting closing coil action current, opening coil action current and energy storage motor action current;
the contact temperature rise monitoring terminal (21) comprises a singlechip minimum system (18) connected with a wireless transceiver module (10), the singlechip minimum system (18) is respectively connected with an EEPROM (electrically erasable programmable read-only memory) and a plurality of optical coupling isolation modules (19), each optical coupling isolation module (19) is externally connected with a temperature sensor (17), and each temperature sensor (17) is connected with an upper contact of a phase A of a high-voltage circuit breaker;
the temperature sensor (17) is a resistance type temperature sensor;
the method is implemented according to the following steps:
Step 1, respectively acquiring a three-phase contact stroke signal, a switching-on and switching-off coil current signal and an energy storage motor signal when a high-voltage circuit breaker acts by a linear displacement sensor (12) and a Hall current transformer (13); the method comprises the following steps of carrying out filtering amplification processing on signal values of respective channels through a signal conditioning circuit (14), isolating the signal values by a linear optocoupler (15), sending the signal values into a monitoring terminal microcontroller (2) for sampling, and carrying out wavelet de-noising processing on the obtained data, and specifically comprises the following steps:
based on all signals needing to be stored for reclosing, an embedded 12-bit high-precision AD module is adopted, the sampling frequency of each analog channel is set to be 100KHz, and 30000 points of long-time action values of 3 seconds are collected;
step 1.1, judging the action type of the high-voltage circuit breaker according to a large array of 30000 points of each of six channels, and combining the actual operation condition of the high-voltage circuit breaker to divide into the following five conditions:
a) Opening a brake; b) switching on 0.3 second after switching off; c) switching on 0.3 second after switching off, and switching off again if a fault still exists; d) closing a switch; e) if a fault occurs after switching on, switching off;
Classifying the data of the six analog acquisition channels according to the five conditions;
step 1.2, according to different action types of the high-voltage circuit breaker in the step 1.1, carrying out data interception on the six-way channel, and storing the intercepted signals into a set cache array, wherein the switching-off time generally does not exceed 50ms, the switching-on time generally does not exceed 100ms, the cache length of the switching-off data is set to be 100ms, namely 1000 points, and the cache length of the switching-on data is 150ms, namely 1500 points;
in order to process the situation c), the cache array is divided into two groups of a separating gate cache 0 and a separating gate cache 1;
Storing the data intercepted by the first brake-separating into a brake-separating cache 0, and storing the data intercepted by the second brake-separating into a brake-separating cache 1; all closing data are stored in a closing cache;
step 1.3, performing wavelet de-noising processing on the intercepted data in the cache, and specifically determining a wavelet scale function as follows:
step a, determining the number N of decomposition layers of wavelet de-noising, and selecting a wavelet threshold function; b, after the step a is finished, selecting a polynomial P (y) PN(y)+yNR (1/2-y) is not less than 0, y is not less than 0 and not more than 1, wherein PN(y) satisfies R (-y) — R (y), and satisfies sup P (y) < 22(N-1)(ii) a Selecting a real coefficient trigonometric polynomial Q (z) such that P (sin)2(ω/2))＝|Q(eiω)|2(ii) a SelectingH in (1)kthe coefficient is the scale function;
c, after the step b is finished, substituting the coefficients into the corresponding scale functions to obtain the coefficients of the wavelet scale functions under different resolution frequencies;
D, after the step c is finished, setting the coefficient of the high-frequency component to be filtered to be zero, and eliminating the interference signal;
step e, after the step d is finished, adding the wavelet scale functions under the other resolution frequencies, reconstructing the wavelet signals, and finally obtaining signals after noise is filtered;
step 2, smoothing the data output in the step 1 by adopting a sliding average value method;
step 3, after the step 2, calculating the average opening speed, the closing speed, the maximum opening and closing speed, the energy storage time and the opening and closing time of the moving contact of the high-voltage circuit breaker, the different opening and closing time of the high-voltage circuit breaker and the different closing time of the high-voltage circuit breaker respectively, and specifically implementing according to the following method:
According to the definition of the parameters of the high-voltage circuit breaker, the average speed of the contact opening is the average speed of the moving contact in the front 6mm of the high-voltage circuit breaker opening; the average closing speed of the contact is the average closing speed of the moving contact in the whole closing stroke of the circuit breaker; the maximum opening and closing speed of the contact is the maximum speed of the whole stroke of the moving contact of the circuit breaker when the circuit breaker acts;
the method for calculating the average opening speed of the moving contact of the high-voltage circuit breaker comprises the following steps:
Finding a point of a high-voltage circuit breaker contact at the moment of 6mm, recording the time of the circuit breaker contact at the moment of 6mm as T, setting the moment of the initial action of the circuit breaker as 0, and then calculating the average opening speed of the moving contact of the high-voltage circuit breaker according to the formula: vOpen＝6/T；
the method for calculating the closing speed of the moving contact of the high-voltage circuit breaker comprises the following steps:
Finding out the point of the action ending moment of the contact of the high-voltage circuit breaker, and recording the current stroke value as S4(ii) a Taking the initial position as the initial stroke value S3Setting the initial time of the closing action of the high-voltage circuit breaker to be 0 and the closing ending time of the contact of the high-voltage circuit breaker to be tCloseThen, the calculation formula of the average closing speed of the moving contact of the high-voltage circuit breaker is as follows: vClose＝(S4-S3)/tClose；
the method for calculating the maximum opening and closing speed of the moving contact of the high-voltage circuit breaker comprises the following steps:
determining the calculation interval value of 5ms of stroke data, namely 50 points, setting the stroke value at the time t as a displacement value of S (t +50), and then determining the instantaneous speed V at the time ttThe formula is as follows:
taking 50 points as calculation step length, starting calculation from the 50 th point of the action of the high-voltage circuit breaker contact according to the formula (1-1), and calculating the moment until the moving contact of the high-voltage circuit breaker finishes the action, so as to obtain the instantaneous speed value at each moment; in order to ensure that the finally obtained instantaneous speed values are more accurate, the maximum 5 instantaneous speed values are found in the instantaneous speed values, a median method is adopted, and the value in the middle of the 5 maximum values is selected as the final moving contact opening and closing maximum speed value;
the RTC real-time clock module (5) is adopted to calculate the energy storage time and the opening and closing time of the high-voltage circuit breaker, and the calculation process is as follows:
Judging the opening and closing amount of a high-voltage circuit breaker opening, closing and energy storage motor in real time, controlling a monitoring terminal microcontroller (2) to sequentially acquire time information of action starting and ending moments when the opening and closing operation of the high-voltage circuit breaker is finished or the energy storage motor starts to finish working, and obtaining the opening and closing time and the working time of the energy storage motor of the high-voltage circuit breaker by subtracting the time information of the action ending moment and the time information of the action starting moment;
According to the obtained opening time and closing time of the high-voltage circuit breaker, the obtained time information respectively has information of three-phase contacts, namely TOPEN_A、TOPEN_B、TOPEN_COr TClose_A、TClose_B、TClose_Cthe first three items are respectively the switching-off time of A, B, C three-phase contacts, and the last three items are respectively the switching-on time of A, B, C three-phase contacts;
Carrying out difference on the three-phase opening time in pairs to obtain the opening different-phase time of A-B, the different-phase time of B-C and the opening different-phase time of C-A, and taking the maximum value of the three values to obtain the opening different-phase time of the high-voltage circuit breaker;
performing difference on the three-phase closing time in pairs to obtain the closing different-phase time of A-B, the closing phase time of B-C and the closing different-phase time of C-A, and taking the maximum value of the three values to obtain the closing different-phase time of the high-voltage circuit breaker;
step 4, after the step 3 is completed, monitoring the temperature rise condition of the high-voltage circuit breaker contact on line in a wireless transmission mode;
step 5, after the steps 1 to 4, the monitoring terminal microcontroller (2) obtains parameters of average speed and maximum speed of the opening and closing contacts in the opening and closing process, the opening different-phase time, the closing different-phase time, the maximum current of the opening and closing coils, the starting current of the energy storage motor, the opening and closing time and the contact temperature rise value; the data are stored through the Flash module (3) to prevent power failure loss, and are uploaded to the human-computer interaction module (11) through the CAN module (7) to be displayed, and simultaneously, the data are uploaded to the monitoring center (16) through the Ethernet module (8) to be remotely monitored.
2. the method for monitoring the mechanical characteristics of the high-voltage circuit breaker by using the mechanical characteristic monitoring system of the high-voltage circuit breaker according to claim 1, wherein the step 2 is implemented according to the following method:
Setting data to be close to stable in a small section of interval M as a certain local average to reduce errors and noises, and continuously and locally averaging the N data along the full length one by one in the small section of interval M;
after the step 1, filling the obtained local average value serving as smoothed data into an original cache region, when the whole cache calculation is finished, making M-1 points incapable of being calculated, performing last averaging on the M-1 points and a previous point, and filling the average value obtained by calculation serving as a last value into the remaining M-1 positions in the cache region, so as to obtain all smoothed data;
the STM32F407 chip in the monitoring terminal microcontroller (2) is used for summarizing and storing the data subjected to denoising and smoothing, and then analyzing and calculating the data to finally obtain the data comprising: the average speed and the maximum speed of the opening and closing contact in the opening and closing process, the maximum current of the opening and closing coil, the starting current of the energy storage motor, the opening and closing time and the contact temperature rise value.
3. the method for monitoring the mechanical characteristics of the high-voltage circuit breaker by using the mechanical characteristic monitoring system of the high-voltage circuit breaker according to claim 1, wherein the step 4 is implemented by specifically following steps:
Step 4.1, temperature rise monitoring of the high-voltage circuit breaker senses temperature signals through a temperature sensor (17), the temperature sensor (17) has the property of presenting different resistance values in different temperature environments, the temperature signals are converted into voltage signals through a Wheatstone bridge, temperature information of a contact of the high-voltage circuit breaker is obtained, the temperature information is converted into a level range which can be identified by a singlechip minimum system (18) through isolation of an optical coupling isolation module (19), and the voltage value is read through the singlechip minimum system (18);
step 4.2, after the step 4.1 is completed, after the single chip microcomputer minimum system (18) reads a voltage value, according to the characteristics of the temperature sensor (17), looking up a table to obtain an actual temperature value of the high-voltage circuit breaker contact, and continuously reading 10 groups of temperature values to perform data processing on the temperature values when the temperature is collected every time to obtain a more accurate temperature value;
the temperature data is processed by removing two highest values and two lowest values and calculating the average value of the remaining 6 data;
and 4.3, after the temperature data is obtained in the step 4.2, storing the temperature data and the time information through an EEPROM (electrically erasable programmable read-only memory) memory (20), and sending the data to the monitoring terminal microcontroller (2) through the wireless transceiving module (10).
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Families Citing this family (13)
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| CN111044272B (en) * | 2019-11-14 | 2022-03-15 | 国网浙江省电力有限公司嘉兴供电公司 | High-voltage circuit breaker mechanical characteristic test method and device based on big data technology |
| CN111665438A (en) * | 2020-05-22 | 2020-09-15 | 江门市电力工程输变电有限公司 | Calibration method for three-phase synchronous debugging of high-voltage isolating switch |
| CN111537876B (en) * | 2020-06-01 | 2022-08-16 | 中国铁路上海局集团有限公司上海动车段 | Motor train unit input end circuit breaker offline detection system and method for simulating real vehicle environment |
| CN112928682B (en) * | 2021-03-04 | 2022-07-05 | 儒能(山东)电力科技有限公司 | Intelligent draw-out type circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858958A (en) * | 2010-05-20 | 2010-10-13 | 常州市明及电气技术开发有限公司 | Intelligent device and method for monitoring vacuum circuit breaker on line |
| CN201656556U (en) * | 2009-11-02 | 2010-11-24 | 国电南京自动化股份有限公司 | 400V low-voltage protection measurement and control device based on double Profibus-DP bus interfaces |
| CN202041618U (en) * | 2010-12-13 | 2011-11-16 | 云南电力试验研究院(集团)有限公司 | Online monitoring device for high-voltage breaker |
| CN104793132A (en) * | 2015-04-21 | 2015-07-22 | 西安工程大学 | Disconnecting switch contact state detection device and method based on electric field sensor |
| CN105823983A (en) * | 2016-05-06 | 2016-08-03 | 国家电网公司 | Mechanical characteristic state on-line monitoring system for high voltage breaker |
-
2017
- 2017-08-21 CN CN201710720077.XA patent/CN107631863B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201656556U (en) * | 2009-11-02 | 2010-11-24 | 国电南京自动化股份有限公司 | 400V low-voltage protection measurement and control device based on double Profibus-DP bus interfaces |
| CN101858958A (en) * | 2010-05-20 | 2010-10-13 | 常州市明及电气技术开发有限公司 | Intelligent device and method for monitoring vacuum circuit breaker on line |
| CN202041618U (en) * | 2010-12-13 | 2011-11-16 | 云南电力试验研究院(集团)有限公司 | Online monitoring device for high-voltage breaker |
| CN104793132A (en) * | 2015-04-21 | 2015-07-22 | 西安工程大学 | Disconnecting switch contact state detection device and method based on electric field sensor |
| CN105823983A (en) * | 2016-05-06 | 2016-08-03 | 国家电网公司 | Mechanical characteristic state on-line monitoring system for high voltage breaker |
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|---|---|
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