CN112540292B - Circuit breaker action frequency counting device and method - Google Patents
Circuit breaker action frequency counting device and method Download PDFInfo
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- CN112540292B CN112540292B CN202011158476.XA CN202011158476A CN112540292B CN 112540292 B CN112540292 B CN 112540292B CN 202011158476 A CN202011158476 A CN 202011158476A CN 112540292 B CN112540292 B CN 112540292B
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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 circuit breaker action time counting device and a circuit breaker action time counting method. The device comprises: the open-type current sensor is electrically connected with the counter; the opening type current sensor is used for collecting current signals of the opening and closing coils of the circuit breaker flowing through the power supply line and sending the current signals to the counter; the counter is arranged on a guide rail of a control cabinet of the circuit breaker and is used for acquiring sampling values from the current signals and counting the action times of the circuit breaker according to the sampling values. The invention realizes the counting function of the action times of the circuit breaker in a non-invasive mode, the counting value of the circuit breaker can be remotely transmitted in a wireless way, the on-site reading of the inspection personnel is avoided, and the invention has important significance for improving the state monitoring capability of equipment and the working efficiency of the inspection 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
A high voltage circuit breaker is an important, complex high voltage switchgear. The method can switch normal load, can remove short-circuit fault, bears the dual tasks of control and protection, and plays a key role in safe operation of the power grid. The fault of the circuit breaker often causes power grid accidents, a light person affects normal power supply, a heavy person causes large-area power failure, personal accidents and equipment damage, and therefore maintenance and overhaul work of the circuit breaker in operation is very important. The operating times, accumulated breaking times and short-circuit current values of the running circuit breaker are important state quantities for evaluating the state of the circuit breaker, and are an important basis for overhauling the circuit breaker. The substation operation rules also specify that production operators must regularly record the number of actions of each breaker as an important operation state quantity to save.
The existing circuit breaker action times counting device basically needs to be connected with an auxiliary switch of a circuit breaker body or connected with a coil of a circuit breaker control closing loop in parallel, and needs to be connected with the circuit breaker body, so that non-invasive installation cannot be realized. In addition, the existing circuit breaker action times counting device displays the counting value in a local control cabinet door or cabinet. Production operators need to regularly copy on site, so that abnormal conditions of the action times of the circuit breaker cannot be found in time, and the workload of recording and analysis 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 device for counting the action times of the circuit breaker in the prior art cannot realize non-invasive installation detection.
In a first aspect, a circuit breaker action count apparatus is provided, comprising: the open-type current sensor is electrically connected with the counter; the opening type current sensor is used for collecting current signals of the opening and closing coils of the circuit breaker flowing through the power supply line and sending the current signals to the counter; the counter is arranged on a guide rail of a control cabinet of the circuit breaker and is used for acquiring sampling values from the current signals and counting the action times of the circuit breaker according to the sampling values.
Further, the counter includes: the system comprises a main control module, an analog-to-digital conversion module and a signal processing module, wherein 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 a current analog signal of an opening and closing coil of the circuit breaker, which is sent by the opening 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; 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 includes: the data transmission module is electrically connected with the main control module and is 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 includes: and the man-machine interaction module is electrically connected with the main control module and is used for receiving and displaying third information sent by the main control module.
Further, the counter further includes: the power supply module is respectively and electrically 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 man-machine interaction module, and the power supply conversion module is used for respectively converting power supply signals into direct current power supply signals required by 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 man-machine interaction module and then sending the direct current power supply signals to the corresponding modules.
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 continuous first preset number of sampling values is larger than a first preset threshold value, increasing the action times of the circuit breaker once.
Further, the pulse waveform detection algorithm further includes: and in a first preset time after the action times of the circuit breaker are increased once, keeping the action times of the circuit breaker unchanged.
Further: the counting method of the counter is a fundamental wave current detection algorithm, and the fundamental wave current detection algorithm comprises the following steps: calculating the sum of absolute values of a second continuous preset number of 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 continuous third preset number of current effective values is larger than the second preset threshold value, increasing the action times of the circuit breaker once.
Further, the fundamental current detection algorithm further includes: and in a second preset time after the action times of the circuit breaker are increased once, keeping the action times of the circuit breaker unchanged.
In a second aspect, a method for counting the number of circuit breaker actions is provided, where the circuit breaker action number counting device according to the embodiment of the first aspect is used for counting the number 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, so that 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 remotely transmitted in a wireless way, the on-site reading of the inspection personnel is avoided, and the method has important significance for improving the state monitoring capability of equipment and the working efficiency of the inspection personnel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram showing a circuit breaker operation count 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 a fundamental current detection algorithm of an embodiment of the present invention is directed.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a circuit breaker action time counting device. As shown in fig. 1, the circuit breaker operation number counting apparatus includes: an open type 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 to be perforated and open, so that a power supply wire 3 of an opening and closing coil of the circuit breaker penetrates through the open type current sensor 1. The power supply line 3 carries the current to the opening and closing coil of the circuit breaker. The open-type current sensor 1 is used for acquiring a current signal flowing through an opening/closing coil of a circuit breaker of a power supply line 3 and transmitting the current signal to the counter 2. It should be appreciated that the open-ended current sensor 1 may also convert the current signal into a voltage signal more suitable for sampling by the counter 2 in advance.
Specifically, the opening of the open type current sensor 1 is opened during installation, the power supply wire 3 of the opening type current sensor 1 is penetrated into the hole of the open type current sensor, and then the opening is closed, so that the action current signal of the opening type current sensor of the circuit breaker can be accurately measured.
Specifically, the open-type current sensor 1 may be a passive electromagnetic type through-core transformer CT, or may be an active hall current sensor based on the hall effect. When an active hall effect based hall current sensor is employed, the power supply for the hall current sensor is provided by the counter 2 via a cable. The hall current sensor is typically a 5V or 12V sensor. The output signal of the open-ended current sensor 1 can also be transmitted to the counter 2 via a cable. Thus, the cable may be a 4-core cable in which 2 cores are used to power the hall current sensor, and the other 2 cores are used as output signal transmission cables of the hall current sensor. One end of the 4-core cable is connected with the 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 the passive electromagnetic penetration CT is used, a sampling resistor needs to be provided in the counter 2.
The counter 2 is mounted on a rail of a control cabinet of the circuit breaker. The counter 2 is used for acquiring sampling values from the current signal and counting the action times of the circuit breaker according to the sampling values.
Specifically, the counter 2 mainly includes: the device comprises 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 used for controlling the analog-to-digital conversion module 202 and the signal processing module 203 to work, so that each module realizes 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 an opening/closing coil of the circuit breaker sent by the opening 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 be not less than 4KHz, and the sampling bit width should be not less than 10bits. The starting, 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 the passive electromagnetic penetration 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 sent to the analog-to-digital conversion module 202 after passing through the sampling resistor.
The signal processing module 203 is configured to count the number of actions of the circuit breaker according to the received sampling value, and send the number of actions of the circuit breaker to the main control module 201. The working 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: pulse waveform detection algorithms and fundamental current detection algorithms. The configurable parameters executed by both algorithms are configured by the master control module 201. In addition, the signal processing module 203 specifically executes either one or both of the pulse waveform detection algorithm and the fundamental current detection algorithm, and is also configured by the main control module 201.
Specifically, the pulse waveform detection algorithm includes:
if a first predetermined number (M) of samples are consecutive (i.e. I n+1 ，I n+2 …，I n+M ，I n Is the sampled value) is greater than a first predetermined threshold value (I th1 ) The number of operations of the circuit breaker is increased once.
It should be appreciated that the first preset time (typically T 1 Second), the action times of the circuit breaker are kept unchanged, namely, a first preset time T after each time the pulse waveform detection algorithm is met 1 The sampling data in the circuit breaker does not execute a pulse waveform detection algorithm, and counting error caused by oscillation of current waveforms of opening and closing coils of single circuit breaker action is avoidedAnd (3) difference.
Wherein the first preset number M and the first preset threshold I th1 A first preset time T 1 All are empirical values.
The characteristic waveform aimed at by the pulse waveform detection algorithm is shown in fig. 2, the current data waveform of the opening and closing coil when the circuit breaker acts is a pulse signal, and the duration time is short.
Specifically, the fundamental current detection algorithm includes:
(1) Calculating the sum (I) of the absolute values of a second predetermined number (L) of consecutive sample values within a half cycle x )。
(2) Dividing the sum of the absolute values by a preset parameter to obtain a current effective value.
The calculation formula is as follows: i y ＝I x /I coff . Wherein I is y Indicating the effective value of the current, I coff Representing preset parameters. A second preset number L and a preset parameter I coff Determined 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 (e.g., 10 ms). Preset parameter I coff Parameters for which the fundamental effective value is calculated are related. For example, if the sampling frequency of the analog-to-digital conversion module 202 is 4KHz, the value of the second preset number L is 40, and the parameter I is preset coff Is 35.991. As shown in fig. 3, the characteristic waveform of the fundamental wave current detection algorithm is a characteristic waveform of the switching-on/off coil current data waveform of the breaker in operation, which has a long duration and is mainly composed of a fundamental wave current component.
(3) If the third preset number (N) of current effective values is greater than the second preset threshold value (I th2 ) The number of operations of the circuit breaker is increased once.
It should be appreciated that the second preset time (generally T 2 Second), the action times of the circuit breaker are kept unchanged, namely the fundamental current detection algorithm is not executed by sampling data in a second preset time after the fundamental current detection algorithm is met each time, and counting errors caused by oscillation of current waveforms of opening and closing coils of single circuit breaker actions are avoided. A second preset time T 2 Is an empirical value.
Preferably, the analog-to-digital conversion module 202 and the signal processing module 203 may be integrated within one MCU (Microcontroller Unit) processor chip. For example, MSP430 series MCU chips of the inter-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 operate on the same MCU processor, for example, an MSP430 series MCU chip with the analog-to-digital conversion module 202 integrated therein.
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 the first information sent by the main control module 201 and send the first information to an external device; and receiving the second information transmitted from the external device and transmitting the second information to the main control module 201. The first information includes the number of breaker actions, 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, namely the data transmission module 204 can support simultaneous operation of 2 wireless communication systems. For example, the data transmission module 204 integrates both a LoRa long-range wireless communication unit and a bluetooth short-range wireless communication unit, and simultaneously enables long-range and short-range wireless communication. The LoRa long-distance wireless communication unit can communicate with a remote external background system, and the Bluetooth short-distance communication unit can communicate with a mobile phone or a 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. For example, a S78S chip integrated with a LoRa unit or a CC2652 integrated with a ZigBee/bluetooth wireless unit, etc.
Preferably, the counter 2 further comprises: and a man-machine interaction module 205. The man-machine 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-machine interaction module 205 may include a display, a keyboard, and the like, available for human-machine interaction. The display may receive and display the third information transmitted from the main control module 201. The third information may include a number of circuit breaker actions, an algorithm parameter value, a wireless parameter value, a device status, and the like. In addition, the man-machine interaction module 205 may also receive external information or instructions and send the external information or instructions to the main control module 201. External information or instructions are typically entered by the operator.
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 man-machine interaction module 205 respectively. The power conversion module 206 is configured to convert the power signals into dc power signals 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 man-machine interaction module 205, and send the dc power signals to the corresponding modules. The power module 206 can support power supplies commonly used in substations, including 220V AC, 220V DC, 110V DC, etc. The input power signal of the power module 206 is obtained from the outside and is input through a connection terminal.
The embodiment of the invention also discloses a method for counting the action times of the circuit breaker. The method adopts the breaker action time counting device described in the embodiment to count the breaker action time.
In summary, 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, so that 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 remotely transmitted in a wireless way, the on-site reading of the inspection personnel is avoided, and the method has important significance for improving the state monitoring capability of equipment and the working efficiency of the inspection personnel.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (5)
1. A counting method of a circuit breaker operation count device, comprising the circuit breaker operation count device, the circuit breaker operation count device comprising: the open-type current sensor is electrically connected with the counter;
the opening type current sensor is used for collecting current signals of the opening and closing coils of the circuit breaker flowing through the power supply line and sending the current signals to the counter;
the counter is arranged on a guide rail of a control cabinet of the circuit breaker, and is used for acquiring sampling values from the current signals and counting the action times of the circuit breaker according to the sampling values;
the method for counting by the counter is a pulse waveform detection algorithm, and the pulse waveform detection algorithm comprises the following steps:
if the absolute value of the continuous first preset number of sampling values is larger than a first preset threshold value, the action times of the circuit breaker are increased once;
the pulse waveform detection algorithm further comprises: the action times of the circuit breaker are kept unchanged within a first preset time after the action times of the circuit breaker are increased once; or alternatively, the process may be performed,
the counting method of the counter is a fundamental wave current detection algorithm, and the fundamental wave current detection algorithm comprises the following steps:
calculating the sum of absolute values of a second continuous preset number of sampling values in a half cycle;
dividing the sum of the absolute values by a preset parameter to obtain a current effective value;
if the continuous third preset number of current effective values is larger than the second preset threshold value, the action times of the circuit breaker are increased once;
the fundamental current detection algorithm further includes: and in a second preset time after the action times of the circuit breaker are increased once, keeping the action times of the circuit breaker unchanged.
2. The counting method of the circuit breaker operation count device according to claim 1, wherein the counter includes: the system comprises a main control module, an analog-to-digital conversion module and a signal processing module, wherein 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 a current analog signal of an opening and closing coil of the circuit breaker, which is sent by the opening 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;
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 counting method of the circuit breaker operation count device according to claim 2, wherein the counter further comprises: the data transmission module is electrically connected with the main control module and is 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. A counting method of a circuit breaker action count apparatus according to claim 3, wherein the counter further comprises: and the man-machine interaction module is electrically connected with the main control module and is used for receiving and displaying third information sent by the main control module.
5. The counting method of the circuit breaker operation count device according to claim 4, wherein the counter further comprises: the power supply module is respectively and electrically 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 man-machine interaction module, and the power supply conversion module is used for respectively converting power supply signals into direct current power supply signals required by 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 man-machine interaction module and then sending the direct current power supply signals to the corresponding modules.
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| DE102021207633A1 (en) * | 2021-07-16 | 2023-01-19 | Robert Bosch Gesellschaft mit beschränkter Haftung | Method for monitoring short-circuit switching processes in a circuit of a control unit |
| 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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