CN114264999A - Device and method for detecting faults after meter reading - Google Patents
Device and method for detecting faults after meter reading Download PDFInfo
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- CN114264999A CN114264999A CN202111493775.3A CN202111493775A CN114264999A CN 114264999 A CN114264999 A CN 114264999A CN 202111493775 A CN202111493775 A CN 202111493775A CN 114264999 A CN114264999 A CN 114264999A
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Abstract
The invention relates to the technical field of power failure detection, and discloses a device and a method for detecting faults behind a meter.
Description
Technical Field
The invention relates to the technical field of power fault detection, in particular to a device and a method for detecting faults behind a meter.
Background
At present, a phenomenon exists in the power supply and distribution network fault emergency repair work, namely when a user encounters power failure in a home, the user is difficult to check by himself, when the user finds the power failure, the user firstly dials a power supply emergency repair call to request assistance of power supply emergency repair personnel, when the power supply emergency repair personnel respond to the user appeal and arrive at a fault site, a voltage and current value of an asset boundary point (an air switch of an ammeter) is measured by using an electroscope pen to judge whether a fault position is in a property range required to be responsible for a power supply enterprise (a front section line of the air switch of the ammeter is a power supply enterprise asset, a rear section line is a user asset), but a judgment result is that user equipment has a fault and the user needs to contact with the electrician to perform maintenance and solve the fault, so that the working mode wastes public social resources and reduces fault detection efficiency.
Disclosure of Invention
The invention provides a device and a method for detecting a post-table fault, which solve the technical problem of low post-table fault detection efficiency in the prior art.
In view of the above, a first aspect of the present invention provides a post-table fault detection apparatus, including: the device comprises a signal conditioning unit, an AD sampling unit, a microprocessing unit, a state indicating unit and a remote communication unit;
the signal conditioning unit is electrically connected with an external electric meter air switch, and is used for receiving an alternating voltage signal input by the external electric meter air switch, conditioning the alternating voltage signal, and sending the signal-conditioned alternating voltage signal to the AD sampling unit;
the AD sampling unit is used for sampling the alternating voltage signal by utilizing an alternating voltage amplitude detection algorithm so as to obtain a digital sampling signal, calculating a signal peak value through the digital sampling signal and sending the signal peak value to the micro-processing unit;
the micro-processing unit is used for comparing the signal peak value with a preset voltage threshold value, and if the signal peak value is larger than the preset voltage threshold value, generating a fault signal and sending the fault signal to the state indicating unit;
the state indicating unit comprises an indicating lamp and a control loop switch, the indicating lamp is connected to an outlet of an external electric meter air switch, the initial state of the indicating lamp is a first state, the indicating lamp is electrically connected with the control loop switch, the control loop switch is used for receiving the fault signal, converting the indicating lamp from the first state to a second state according to the fault signal, generating a state conversion early warning signal and sending the state conversion early warning signal to the remote communication unit;
and the remote communication unit is used for sending the state conversion early warning signal to a distribution service center.
Preferably, the signal conditioning unit comprises a voltage transformer and a resistor, and the voltage transformer is electrically connected with the resistor.
Preferably, the status indication unit further comprises a buzzer, and the buzzer is electrically connected with the micro-processing unit and used for receiving the fault signal so as to generate buzzing.
Preferably, the device further comprises a power management unit, and the power management unit is electrically connected with the signal conditioning unit, the AD sampling unit, the microprocessor unit, the state indicating unit and the remote communication unit respectively.
Preferably, the micro-processing unit comprises a digital filter for digitally filtering the signal peaks sent by the AD sampling unit.
In a second aspect, the present invention further provides a method for detecting a post-table fault, where the method is based on the device for detecting a post-table fault and includes the following steps:
acquiring an alternating voltage signal input by an external air switch of an electric meter, and conditioning the alternating voltage signal;
sampling the alternating voltage signal by using an alternating voltage amplitude detection algorithm to obtain a digital sampling signal, and calculating a signal peak value through the digital sampling signal;
comparing the signal peak value with a preset voltage threshold value, and if the signal peak value is larger than the preset voltage threshold value, generating a fault signal and sending the fault signal to a state indicating unit;
converting the indicator light from the first state to a second state according to the fault signal, and generating a state conversion early warning signal;
and sending the state conversion early warning signal to a distribution service center.
Preferably, the method further comprises: the signal peaks are digitally filtered.
According to the technical scheme, the invention has the following advantages:
according to the invention, the alternating voltage signal input by the air switch of the electric meter is obtained, the alternating voltage signal is sampled to obtain the digital sampling signal, the signal peak value is calculated through the digital sampling signal, the signal peak value is compared with the preset voltage threshold value, if the signal peak value is larger than the preset voltage threshold value, the fault signal is generated, the indicator lamp is converted into the second state from the first state according to the fault signal, the state conversion early warning signal is generated, and the state conversion early warning signal is remotely sent to the distribution transformer service center, so that power supply operation and maintenance personnel can know the occurrence of a fault event in time conveniently, and the passive service is converted into the active service, thereby improving the fault detection efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a post-table fault detection apparatus according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a signal conditioning unit according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting a post-table fault according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
For easy understanding, referring to fig. 1, the present invention provides a post-watch fault detection apparatus, including: the system comprises a signal conditioning unit 100, an AD sampling unit 200, a microprocessing unit 300, a state indicating unit 400 and a remote communication unit 500;
the signal conditioning unit 100 is electrically connected with an external electric meter air switch, and is configured to receive an alternating voltage signal input by the external electric meter air switch, perform signal conditioning on the alternating voltage signal, and send the alternating voltage signal after the signal conditioning to the AD sampling unit 200;
as shown in fig. 2, the signal conditioning unit 100 includes a voltage transformer and a resistor, the voltage transformer is electrically connected to the resistor, the voltage transformer adopts a star-grid high-precision miniature voltage transformer SPT-2MA/2MA, and primary voltage of 220V is changed into low voltage through a series resistor R1 to condition the voltage to a proper voltage signal.
The AD sampling unit 200 is configured to sample an ac voltage signal by using an ac voltage amplitude detection algorithm, thereby obtaining a digital sampling signal, calculate a signal peak value from the digital sampling signal, and send the signal peak value to the microprocessor unit 300;
the AD sampling unit 200 selects an AD sampling chip AD7997 produced by ADI, and the data read-write and mode control of the chip communicate through an I2C protocol and exchange data with the microprocessor unit 300 to realize synchronous sampling of two paths of voltages.
The alternating voltage amplitude detection algorithm comprises a period integration method, a fast FFT algorithm, a DQ algorithm and the like. The period integration method and the fast FFT algorithm at least need effective information of half cycle, the DQ algorithm is generally more suitable for a three-phase symmetric system, and generally can not be directly applied to a single-phase system or a three-phase system with non-three-phase simultaneous short circuit fault.
In this embodiment, three times of digital sampling signals are continuously obtained at a preset sampling frequency, and the signal peak value is obtained by the following formula:
wherein U represents a signal peak value, U (k1) represents a first time digital sampling signal, U (k2) represents a second time digital sampling signal, U (k3) represents a third time digital sampling signal, and N represents the number of sampling times in one power frequency cycle.
As can be seen from the above formula, for any sinusoidal signal, only three continuous digital sampling signals are needed to calculate the peak value of the signal, and then the amplitude of the signal is obtained.
The microprocessor unit 300 is configured to compare the signal peak value with a preset voltage threshold, and if the signal peak value is greater than the preset voltage threshold, generate a fault signal and send the fault signal to the status indication unit 400;
wherein, the micro-processing unit 300 adopts an STM32F103VGT6 microprocessor based on CORTEX-M332 bit RISC kernel.
The state indicating unit 400 comprises an indicating lamp and a control loop switch, the indicating lamp is connected to an outlet of an external electric meter air switch, the initial state of the indicating lamp is a first state, the indicating lamp is electrically connected with the control loop switch, the control loop switch is used for receiving a fault signal, converting the indicating lamp from the first state to a second state according to the fault signal, generating a state conversion early warning signal and sending the state conversion early warning signal to the remote communication unit 500;
in this embodiment, the first state can be the normally open state, and the second state can be the normally closed state, and under the circumstances of no trouble, this indicator control circuit switch can normally open, makes the pilot lamp not switch on the power, keeps going out always, saves the power consumption.
The remote communication unit 500 is configured to send a state transition warning signal to the distribution service center.
The remote communication unit has an internet of things communication function, the internet of things communication function is connected to a remote distribution transformation service center through 2G/3G/4G remote communication, data can be viewed at a remote end, multiple communication modes of 2G GPRS/NB-IOT/4G LET can be achieved, and application requirements of the internet of things are met.
And under the condition of failure, reporting the state conversion early warning signal to a distribution transformer service center, so that power supply operation and maintenance personnel can know the occurrence of the failure event in time conveniently, and the passive service is converted into active service. Meanwhile, under the condition that a power failure event occurs in a user house, the user can automatically turn on the control loop switch, and judge whether the fault point is positioned at a power supply end or a user end by observing whether the state of the indicator lamp changes, so that the position is conveniently located and maintained.
The embodiment provides a fault detection device behind table, through the alternating voltage signal who obtains ammeter air switch input, sample the alternating voltage signal, thereby obtain digital sampling signal, calculate the signal peak value through digital sampling signal, compare signal peak value and predetermined voltage threshold value, when signal peak value is greater than predetermined voltage threshold value, then generate fault signal, convert the pilot lamp into the second state by first state according to fault signal, and generate state conversion early warning signal, and with state conversion early warning signal remote transmission to distribution transformer service center, the power supply fortune dimension personnel of being convenient for in time learn the emergence of fault incident, change passive service into active service, thereby improve fault detection efficiency.
In this embodiment, the status indication unit 400 further comprises a buzzer, which is electrically connected to the micro processing unit 300 and is used for receiving the fault signal to generate a buzzer.
In this embodiment, the apparatus further includes a power management unit, and the power management unit is electrically connected to the signal conditioning unit 100, the AD sampling unit 200, the microprocessor unit 300, the status indication unit 400, and the remote communication unit 500, respectively.
The power supply of the power management unit is from an alternating current 220V voltage system, and is converted into direct current 5V voltage by the switching power supply circuit to supply power to the signal conditioning unit 100, the AD sampling unit 200, the micro-processing unit 300, the state indicating unit 400 and the remote communication unit 500. The power management unit adopts an LM1117-3.3 chip, and a battery is arranged in the power management unit to supply power to the micro-processing unit 300 and the remote communication unit 500 so as to ensure that the device can still send and receive data in a short time after power failure.
In the present embodiment, the micro-processing unit 300 includes a digital filter for digitally filtering the signal peak value transmitted from the AD sampling unit 200.
It should be noted that, because a large amount of harmonic components often exist in the actual voltage waveform, and the ac voltage amplitude detection algorithm itself amplifies high-frequency noise, in actual use, a digital filter is required to filter the signal peak. The digital filter may be a FIR or IIR filter.
The following is a detailed description of an embodiment of a method for detecting a fault after a watch provided by the present invention.
For convenience of understanding, please refer to fig. 3, the present invention provides a method for detecting a post-table fault, which is based on the above-mentioned device for detecting a post-table fault, and includes the following steps:
s1, acquiring an alternating current voltage signal input by an external electric meter air switch, and conditioning the alternating current voltage signal;
s2, sampling the alternating voltage signal by using an alternating voltage amplitude detection algorithm to obtain a digital sampling signal, and calculating a signal peak value through the digital sampling signal;
s3, comparing the signal peak value with a preset voltage threshold value, and if the signal peak value is larger than the preset voltage threshold value, generating a fault signal and sending the fault signal to a state indicating unit;
s4, converting the indicator light from the first state to the second state according to the fault signal, and generating a state conversion early warning signal;
and S5, sending the state transition early warning signal to a distribution service center.
In this embodiment, the method further includes: the signal peaks are digitally filtered.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A post-watch fault detection device, comprising: the device comprises a signal conditioning unit, an AD sampling unit, a microprocessing unit, a state indicating unit and a remote communication unit;
the signal conditioning unit is electrically connected with an external electric meter air switch, and is used for receiving an alternating voltage signal input by the external electric meter air switch, conditioning the alternating voltage signal, and sending the signal-conditioned alternating voltage signal to the AD sampling unit;
the AD sampling unit is used for sampling the alternating voltage signal by utilizing an alternating voltage amplitude detection algorithm so as to obtain a digital sampling signal, calculating a signal peak value through the digital sampling signal and sending the signal peak value to the micro-processing unit;
the micro-processing unit is used for comparing the signal peak value with a preset voltage threshold value, and if the signal peak value is larger than the preset voltage threshold value, generating a fault signal and sending the fault signal to the state indicating unit;
the state indicating unit comprises an indicating lamp and a control loop switch, the indicating lamp is connected to an outlet of an external electric meter air switch, the initial state of the indicating lamp is a first state, the indicating lamp is electrically connected with the control loop switch, the control loop switch is used for receiving the fault signal, converting the indicating lamp from the first state to a second state according to the fault signal, generating a state conversion early warning signal and sending the state conversion early warning signal to the remote communication unit;
and the remote communication unit is used for sending the state conversion early warning signal to a distribution service center.
2. The device of claim 1, wherein the signal conditioning unit comprises a voltage transformer and a resistor, the voltage transformer being electrically connected to the resistor.
3. The device of claim 1, wherein the status indication unit further comprises a buzzer, the buzzer being electrically connected to the micro-processing unit for receiving the fault signal to generate a beep.
4. The device according to claim 1, further comprising a power management unit electrically connected to the signal conditioning unit, the AD sampling unit, the microprocessor unit, the status indication unit, and the remote communication unit, respectively.
5. The device of claim 1, wherein the micro-processing unit comprises a digital filter for digitally filtering the signal peaks transmitted by the AD sampling unit.
6. A method for detecting a post-table fault, based on the device for detecting a post-table fault according to any one of claims 1 to 5, comprising the steps of:
acquiring an alternating voltage signal input by an external air switch of an electric meter, and conditioning the alternating voltage signal;
sampling the alternating voltage signal by using an alternating voltage amplitude detection algorithm to obtain a digital sampling signal, and calculating a signal peak value through the digital sampling signal;
comparing the signal peak value with a preset voltage threshold value, and if the signal peak value is larger than the preset voltage threshold value, generating a fault signal and sending the fault signal to a state indicating unit;
converting the indicator light from the first state to a second state according to the fault signal, and generating a state conversion early warning signal;
and sending the state conversion early warning signal to a distribution service center.
7. The method of post-table fault detection according to claim 6, further comprising: the signal peaks are digitally filtered.
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| CN202111493775.3A CN114264999A (en) | 2021-12-08 | 2021-12-08 | Device and method for detecting faults after meter reading |
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| CN202111493775.3A CN114264999A (en) | 2021-12-08 | 2021-12-08 | Device and method for detecting faults after meter reading |
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