CN112540292A - Device and method for counting circuit breaker action times - Google Patents
Device and method for counting circuit breaker action times Download PDFInfo
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- CN112540292A CN112540292A CN202011158476.XA CN202011158476A CN112540292A CN 112540292 A CN112540292 A CN 112540292A CN 202011158476 A CN202011158476 A CN 202011158476A CN 112540292 A CN112540292 A CN 112540292A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention discloses a device and a method for counting the action times of a circuit breaker. The device includes: the open type current sensor is electrically connected with the counter; the power supply line of the opening and closing coil of the circuit breaker penetrates through the opening type current sensor, and the opening type current sensor is used for collecting current signals of the opening and closing coil of the circuit breaker flowing through the power supply line and sending the current signals to the counter; the counter is installed on the guide rail of the control cabinet of the circuit breaker, and the counter is used for obtaining a sampling value from the current signal and counting the action times of the circuit breaker according to the sampling value. The invention realizes the function of counting the action times of the circuit breaker in a non-invasive manner, the count value of the circuit breaker can be transmitted wirelessly and remotely, the on-site reading of the polling personnel is avoided, and the invention has important significance for improving the state monitoring capability of equipment and the working efficiency of the polling personnel.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a circuit breaker action frequency counting device and method.
Background
High-voltage circuit breakers are an important and complex class of high-voltage switchgear. The system can switch normal load, can eliminate short-circuit fault, undertakes double tasks of control and protection, and plays a key role in safe operation of a power grid. The fault of the circuit breaker often causes the power grid accident, the light person influences the normal power supply, the heavy person causes large-area power failure, personal accident and equipment damage, therefore the maintenance and overhaul work of the circuit breaker is very important in operation. The number of circuit breaker actions, the accumulated opening and closing number and the short-circuit current value in operation are important state quantities for evaluating the state of the circuit breaker and are an important basis for the maintenance of the circuit breaker. The operation regulations of the transformer substation are also specified clearly, and production operators must record the action times of each breaker regularly and store the action times as an important operation state quantity.
The conventional circuit breaker action frequency counting device basically needs to be connected with an auxiliary switch of a circuit breaker body or connected in parallel on a coil of a circuit breaker control closing loop, and all the devices need to be connected with the circuit breaker body in a wiring mode, so that non-invasive installation cannot be realized. In addition, the conventional circuit breaker operation frequency counting device displays a count value on a local control cabinet door or in a local cabinet. Production operators need to go to the site to copy regularly, so that the abnormal condition of the action times of the circuit breaker cannot be found in time, and the workload of recording and analyzing is increased.
Disclosure of Invention
The embodiment of the invention provides a device and a method for counting the action times of a circuit breaker, which are used for solving the problem that the circuit breaker action time counting device in the prior art cannot realize non-invasive installation detection.
In a first aspect, a circuit breaker action number counting device is provided, including: the open type current sensor is electrically connected with the counter; the power supply line of the opening and closing coil of the circuit breaker penetrates through the opening type current sensor, and the opening type current sensor is used for collecting current signals of the opening and closing coil of the circuit breaker flowing through the power supply line and sending the current signals to the counter; the counter is installed on the guide rail of the control cabinet of the circuit breaker, and the counter is used for obtaining a sampling value from the current signal and counting the action times of the circuit breaker according to the sampling value.
Further, the counter includes: the analog-to-digital conversion module is respectively and electrically connected with the open type current sensor, the main control module and the signal processing module, and the main control module is also electrically connected with the signal processing module; the main control module is used for controlling the analog-to-digital conversion module and the signal processing module to work; the analog-to-digital conversion module is used for receiving the current analog signal of the switching-on/off coil of the circuit breaker sent by the open type current sensor, sampling the current analog signal to obtain a sampling value of the current analog signal, converting the sampling value of the current analog signal into a sampling value of a current digital signal and sending the sampling value to the signal processing module; and the signal processing module is used for counting the action times of the circuit breaker according to the received sampling value and sending the action times of the circuit breaker to the main control module.
Further, the counter further comprises: the data transmission module is electrically connected with the main control module and used for receiving first information sent by the main control module and sending the first information to an external device; and receiving second information sent by the external device, and sending the second information to the main control module.
Further, the counter further comprises: and the human-computer interaction module is electrically connected with the main control module and is used for receiving and displaying the third information sent by the main control module.
Further, the counter further comprises: the power supply module is respectively connected with the open type current sensor, the main control module, the analog-to-digital conversion module, the signal processing module, the data transmission module and the human-computer interaction module, the power supply conversion module is used for respectively converting a power supply signal into the open type current sensor, the main control module, the analog-to-digital conversion module, the signal processing module, the data transmission module and the corresponding module is sent to after the direct current power supply signal required by the human-computer interaction module.
Further: the method for counting by the counter is a pulse waveform detection algorithm, and the pulse waveform detection algorithm comprises the following steps: and if the absolute value of the sampling values of the continuous first preset number is greater than a first preset threshold value, increasing the action times of the circuit breaker once.
Further, the pulse waveform detection algorithm further includes: and keeping the action times of the circuit breaker unchanged within a first preset time after the action times of the circuit breaker is increased once.
Further: the counter counts by a fundamental current detection algorithm, and the fundamental current detection algorithm comprises the following steps: calculating the sum of absolute values of a second preset number of continuous sampling values in a half cycle; dividing the sum of the absolute values by a preset parameter to obtain a current effective value; and if the effective values of the continuous third preset number of currents are larger than a second preset threshold value, increasing the action times of the circuit breaker once.
Further, the fundamental current detection algorithm further includes: and keeping the action times of the circuit breaker unchanged within a second preset time after the action times of the circuit breaker is increased once.
In a second aspect, a method for counting the number of times of circuit breaker actions is provided, wherein the device for counting the number of times of circuit breaker actions is adopted to count the number of times of circuit breaker actions.
According to the embodiment of the invention, the action of the circuit breaker is judged by analyzing the action data of the opening and closing coil of the circuit breaker, the counting function of the action times of the circuit breaker is realized in a non-invasive mode, the counting value of the circuit breaker can be wirelessly transmitted remotely, the on-site counting of the polling personnel is avoided, and the method and the device have important significance for improving the state monitoring capability of equipment and the working efficiency of the polling personnel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a block diagram showing a circuit breaker operation count counting apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a characteristic waveform of a current for which a pulse waveform detection algorithm of an embodiment of the present invention is directed;
fig. 3 is a schematic diagram of a characteristic waveform of a current for which the fundamental current detection algorithm of the embodiment of the present invention is directed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a counting device for the action times of a circuit breaker. As shown in fig. 1, the circuit breaker operation number counting apparatus includes: an open-ended current sensor 1 and a counter 2. The open type current sensor 1 is electrically connected to the counter 2.
The open type current sensor 1 is designed in a perforated open type, and therefore, a power supply line 3 of a switching coil of the circuit breaker penetrates through the open type current sensor 1. The power supply line 3 transmits a current to the opening and closing coil of the circuit breaker. The open type current sensor 1 is used for collecting current signals flowing through a switching-on and switching-off coil of the circuit breaker of the power supply line 3 and sending the current signals to the counter 2. It should be understood that the open-cell current sensor 1 may also convert the current signal into a voltage signal in advance that is more suitable for sampling by the counter 2.
Specifically, the opening of the open type current sensor 1 is opened during installation, the power supply line 3 of the breaker opening and closing coil penetrates through the hole of the open type current sensor 1, then the opening is closed, and the action current signal of the breaker opening and closing coil can be accurately measured.
Specifically, the open-type current sensor 1 may be a passive electromagnetic feedthrough transformer CT, or an active hall current sensor based on the hall effect. When an active hall current sensor based on the hall effect is used, the power supply of the hall current sensor is provided by the counter 2 through a cable. The hall current sensor is typically a 5V or 12V sensor. The output signal of the open-type current sensor 1 can also be transmitted to the counter 2 via a cable. Therefore, the cable can be a 4-core cable, wherein 2 cores are used for supplying power to the Hall current sensor, and the other 2 cores are used as an output signal transmission cable of the Hall current sensor. One end of the 4-core cable is connected with an interface socket of the Hall current sensor. The other end of the 4-core cable is connected with a wiring terminal of the counter 2. When a passive electromagnetic feedthrough CT is used, a sampling resistor needs to be provided in the counter 2.
The counter 2 is mounted on the guide rail of the control cabinet of the circuit breaker. The counter 2 is used for acquiring a sampling value from the current signal and counting the action times of the circuit breaker according to the sampling value.
Specifically, the counter 2 mainly includes: a main control module 201, an analog-to-digital conversion module 202 and a signal processing module 203. The analog-to-digital conversion module 202 is electrically connected with the open type current sensor 1, the main control module 201 and the signal processing module 203 respectively, and the main control module 201 is also electrically connected with the signal processing module 203.
The main control module 201 is configured to control the analog-to-digital conversion module 202 and the signal processing module 203 to operate, so that each module can implement related functions under the control of the main control module 201.
The analog-to-digital conversion module 202 is configured to receive a current analog signal of a switching-on/off coil of the circuit breaker, which is sent by the open-type current sensor 1, sample the current analog signal to obtain a sampling value of the current analog signal, convert the sampling value of the current analog signal into a sampling value of a current digital signal, and send the sampling value to the signal processing module 203. In order to ensure the reliability of the action current data of the opening and closing coil of the circuit breaker, the sampling frequency of the analog-to-digital conversion module 202 should not be less than 4KHz, and the sampling bit width should not be less than 10 bits. The start, parameter configuration and working state of the analog-to-digital conversion module 202 are controlled by the main control module 201. Preferably, when the open-type current sensor 1 adopts a passive electromagnetic feedthrough CT, the sampling resistor is connected to the analog-to-digital conversion module 202, that is, the output signal of the open-type current sensor 1 is transmitted to the analog-to-digital conversion module 202 through the sampling resistor.
The signal processing module 203 is configured to count the number of times of the breaker actions according to the received sampling value, and send the number of times of the breaker actions to the main control module 201. The operating state and parameters of the signal processing module 203 are controlled by the main control module 201.
Specifically, the method for counting by the signal processing module 203 of the counter 2 includes: a pulse waveform detection algorithm and a fundamental current detection algorithm. The configurable parameters executed by both algorithms are configured by the master control module 201. In addition, whether the signal processing module 203 specifically executes one of the pulse waveform detection algorithm and the fundamental wave current detection algorithm or executes both algorithms simultaneously is also configured by the main control module 201.
Specifically, the pulse waveform detection algorithm includes:
if a first predetermined number (M) of consecutive sample values (i.e. I)n+1，In+2…，In+M，InIs a sampled value) is greater than a first predetermined threshold value (I)th1) The number of circuit breaker operations is increased once.
It should be understood that the first preset time (generally T) after the number of actions of the circuit breaker is increased once is1Second), the number of times of the circuit breaker action is kept unchanged, namely the first preset time T after the pulse waveform detection algorithm is satisfied each time1The sampling data in the circuit breaker does not execute a pulse waveform detection algorithm, and the counting error caused by oscillation of the current waveform of the opening and closing coil of a single circuit breaker is avoided.
Wherein, the first preset number M and the first preset threshold Ith1A first preset time T1Are all empirical values.
The characteristic waveform aimed by the pulse waveform detection algorithm is shown in fig. 2, and the opening and closing coil current data waveform during the action of the circuit breaker is a pulse signal and has short duration.
Specifically, the fundamental current detection algorithm includes:
(1) calculating the sum (I) of the absolute values of a second preset number (L) of successive sampling values within a half cyclex)。
(2) And dividing the sum of the absolute values by a preset parameter to obtain the effective value of the current.
The calculation formula is: i isy＝Ix/Icoff. Wherein, IyRepresents the effective value of the current, IcoffRepresenting preset parameters. A second predetermined number L and a predetermined parameter IcoffDetermined by the sampling frequency of the analog-to-digital conversion module 202. Specifically, the second preset number L is the number of sampling values output by the analog-to-digital conversion module 202 in a half cycle (for example, 10 ms). Preset parameter IcoffThe parameter for which the effective value of the fundamental is calculated is correlated. For example, if the sampling frequency of the analog-to-digital conversion module 202 is 4KHz, the value of the second predetermined number L is 40, and the parameter I is predeterminedcoffHas a value of 35.991. The fundamental current detection algorithm is directed to a characteristic waveform as shown in fig. 3, and the switching coil current data waveform at the time of circuit breaker operation has a long duration and is mainly based on the fundamental current component.
(3) If the effective values of the continuous third preset number (N) of currents are larger than the second preset threshold value (I)th2) The number of circuit breaker operations is increased once.
It will be appreciated that the number of circuit breaker actuations is increased by a second predetermined time (typically T) after one2Second), the action times of the circuit breaker is kept unchanged, namely, the fundamental wave current detection algorithm is not executed by sampling data in the second preset time after the fundamental wave current detection algorithm is satisfied every time, and the counting error caused by oscillation of the current waveform of the opening and closing coil of the single circuit breaker action is avoided. Second preset time T2Are empirical values.
Preferably, the analog-to-digital conversion module 202 and the signal processing module 203 may be integrated in an mcu (microcontroller unit) processor chip. For example, an MSP430 series MCU chip with an internal integrated analog-to-digital conversion module 202.
Preferably, the main control module 201, the analog-to-digital conversion module 202 and the signal processing module 203 may be integrated in one MCU processor chip. The main control module 201 and the signal processing module 203 may run on the same MCU processor, for example, an MSP430 series MCU chip with an internal integrated analog-to-digital conversion module 202.
Preferably, the counter 2 further comprises: a data transmission module 204. The data transmission module 204 is electrically connected with the main control module 201, and is configured to receive first information sent by the main control module 201 and send the first information to an external device; and receiving second information sent by the external device, and sending the second information to the main control module 201. The first information includes the number of breaker operations, equipment status information, etc., and the second information includes configuration parameters, control commands, etc. The data transmission module 204 adopts a wireless communication technology, and the adopted wireless communication system can be 1 or 2 of a plurality of wireless communication systems such as Lora, ZigBee, bluetooth, NB-IoT, 4G, 5G, and the like, that is, the data transmission module 204 can support 2 wireless communication systems to work simultaneously. For example, the data transmission module 204 integrates both the LoRa long-distance wireless communication unit and the bluetooth short-distance wireless communication unit, and realizes both long-distance and short-distance wireless communication. The long-distance wireless communication unit of LoRa can communicate with the outside backstage system of far-end, and bluetooth short distance communication unit can communicate with cell-phone or wireless terminal.
Preferably, the main control module 201, the analog-to-digital conversion module 202, the signal processing module 203 and the data transmission module 204 may be integrated in a single chip, and the single chip is a wireless MCU chip including the main control module 201, the analog-to-digital conversion module 202 and the signal processing module 203 therein. For example, an S78S chip integrated with an LoRa unit or a CC2652 integrated with a ZigBee/bluetooth wireless unit, etc.
Preferably, the counter 2 further comprises: a human-computer interaction module 205. The human-computer interaction module 205 is electrically connected to the main control module 201, and is configured to receive and display third information sent by the main control module 201. The human-computer interaction module 205 is also controlled by the main control module 201. The human-computer interaction module 205 may include devices such as a display and a keyboard that can be used for human-computer interaction. The display may receive and display the third information transmitted by the main control module 201. The third information may include breaker action times, algorithm parameter values, wireless parameter values, device status, etc. In addition, the human-computer interaction module 205 may also receive external information or instructions and send the external information or instructions to the main control module 201. The external information or instructions are typically operator input.
Preferably, the counter 2 further comprises: a power module 206. The power module 206 is electrically connected with the open type current sensor 1, the main control module 201, the analog-to-digital conversion module 202, the signal processing module 203, the data transmission module 204 and the human-computer interaction module 205 respectively. The power conversion module 206 is configured to convert the power signal into a dc power signal required by the open-type current sensor 1, the main control module 201, the analog-to-digital conversion module 202, the signal processing module 203, the data transmission module 204, and the human-computer interaction module 205, and then send the dc power signal to the corresponding modules. The power module 206 can support power sources commonly used in substations, including 220V AC, 220V DC, 110V DC, and the like. The input power signal of the power module 206 is obtained from the outside and is input through the connection terminal.
The embodiment of the invention also discloses a method for counting the action times of the circuit breaker. The method adopts the circuit breaker action frequency counting device to count the action frequency of the circuit breaker.
In summary, the embodiment of the invention judges the action of the circuit breaker by analyzing the action data of the opening and closing coil of the circuit breaker, realizes the function of counting the action times of the circuit breaker in a non-invasive mode, avoids the on-site reading of the polling personnel by wirelessly transmitting the count value of the circuit breaker, and has important significance for improving the state monitoring capability of equipment and the working efficiency of the polling personnel.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A circuit breaker action number counting device is characterized by comprising: the open type current sensor is electrically connected with the counter;
the power supply line of the opening and closing coil of the circuit breaker penetrates through the opening type current sensor, and the opening type current sensor is used for collecting current signals of the opening and closing coil of the circuit breaker flowing through the power supply line and sending the current signals to the counter;
the counter is installed on the guide rail of the control cabinet of the circuit breaker, and the counter is used for obtaining a sampling value from the current signal and counting the action times of the circuit breaker according to the sampling value.
2. The circuit breaker actuation count device according to claim 1, wherein said counter comprises: the analog-to-digital conversion module is respectively and electrically connected with the open type current sensor, the main control module and the signal processing module, and the main control module is also electrically connected with the signal processing module;
the main control module is used for controlling the analog-to-digital conversion module and the signal processing module to work;
the analog-to-digital conversion module is used for receiving the current analog signal of the switching-on/off coil of the circuit breaker sent by the open type current sensor, sampling the current analog signal to obtain a sampling value of the current analog signal, converting the sampling value of the current analog signal into a sampling value of a current digital signal and sending the sampling value to the signal processing module;
and the signal processing module is used for counting the action times of the circuit breaker according to the received sampling value and sending the action times of the circuit breaker to the main control module.
3. The circuit breaker actuation count device according to claim 2, wherein said counter further comprises: the data transmission module is electrically connected with the main control module and used for receiving first information sent by the main control module and sending the first information to an external device; and receiving second information sent by the external device, and sending the second information to the main control module.
4. The circuit breaker actuation count device according to claim 3, wherein said counter further comprises: and the human-computer interaction module is electrically connected with the main control module and is used for receiving and displaying the third information sent by the main control module.
5. The circuit breaker actuation count device according to claim 4, wherein said counter further comprises: the power supply module is respectively connected with the open type current sensor, the main control module, the analog-to-digital conversion module, the signal processing module, the data transmission module and the human-computer interaction module, the power supply conversion module is used for respectively converting a power supply signal into the open type current sensor, the main control module, the analog-to-digital conversion module, the signal processing module, the data transmission module and the corresponding module is sent to after the direct current power supply signal required by the human-computer interaction module.
6. The circuit breaker operation count counting apparatus according to claim 1, wherein: the method for counting by the counter is a pulse waveform detection algorithm, and the pulse waveform detection algorithm comprises the following steps:
and if the absolute value of the sampling values of the continuous first preset number is greater than a first preset threshold value, increasing the action times of the circuit breaker once.
7. The circuit breaker actuation count counting apparatus according to claim 6, wherein said pulse waveform detection algorithm further comprises: and keeping the action times of the circuit breaker unchanged within a first preset time after the action times of the circuit breaker is increased once.
8. The circuit breaker operation count counting apparatus according to claim 1, wherein: the counter counts by a fundamental current detection algorithm, and the fundamental current detection algorithm comprises the following steps:
calculating the sum of absolute values of a second preset number of continuous sampling values in a half cycle;
dividing the sum of the absolute values by a preset parameter to obtain a current effective value;
and if the effective values of the continuous third preset number of currents are larger than a second preset threshold value, increasing the action times of the circuit breaker once.
9. The circuit breaker actuation count counting apparatus according to claim 8, wherein the fundamental current detection algorithm further comprises: and keeping the action times of the circuit breaker unchanged within a second preset time after the action times of the circuit breaker is increased once.
10. A method for counting the number of circuit breaker operations, characterized in that the circuit breaker operation number counting device according to any one of claims 1 to 9 is used for counting the number of circuit breaker operations.
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| WO2023285122A1 (en) * | 2021-07-16 | 2023-01-19 | Robert Bosch Gmbh | Method for monitoring short-circuit switching processes of a circuit of a control device |
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| CN111239599A (en) * | 2020-01-17 | 2020-06-05 | 四川明星电力股份有限公司 | On-line monitoring device and method for opening and closing time of circuit breaker |
| CN112858902A (en) * | 2021-02-02 | 2021-05-28 | 南方电网数字电网研究院有限公司 | Miniature circuit breaker monitoring method and device, computer equipment and storage medium |
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| WO2023285122A1 (en) * | 2021-07-16 | 2023-01-19 | Robert Bosch Gmbh | Method for monitoring short-circuit switching processes of a circuit of a control device |
| CN114089071A (en) * | 2021-11-22 | 2022-02-25 | 南京熊猫汉达科技有限公司 | Device and method for predicting state of harmonic filtering unit of short-wave transmitter |
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