CN110609208B - Portable fault wave recording monitor and wave recording monitoring method thereof - Google Patents
Portable fault wave recording monitor and wave recording monitoring method thereof Download PDFInfo
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- CN110609208B CN110609208B CN201910867900.9A CN201910867900A CN110609208B CN 110609208 B CN110609208 B CN 110609208B CN 201910867900 A CN201910867900 A CN 201910867900A CN 110609208 B CN110609208 B CN 110609208B
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Abstract
The invention relates to a portable fault recording monitor and a recording monitoring method thereof, wherein a control circuit on a control panel is used for controlling the work of various modules, the control circuit is initialized, the sampling end of a sampling unit is erected on a wire to be monitored to obtain corresponding initial current, the current is loaded into the control circuit after pretreatment, the control circuit analyzes the current to obtain current waveform data, the current waveform data and the current waveform are transmitted to a receiving party through a communication interface in a data flow mode, the receiving party displays the current waveform on a constructed coordinate system, and a database of the control circuit releases the current waveform data and the current waveform to wait for next sampling or shutdown. The invention obtains waveform data by a simple means, is convenient to transmit, corresponds to a non-high-voltage working environment, does not need large data storage, is small and portable, is popularized in various power failure scenes, and has low manufacturing cost and running cost.
Description
Technical Field
The invention belongs to the field of measuring electrical variables; the technical field of measuring magnetic variables, in particular to a portable fault recording monitor of a device for displaying electrical variables or waveforms and a recording monitoring method thereof.
Background
The fault recording device is a device which can record the waveform and effective value of three-phase current and zero-sequence current on a line, the waveform and effective value of three-phase voltage and zero-sequence voltage on a bus in the whole fault process and form a fault analysis report, and plays an important role in ensuring the safe operation of a power system.
Generally, the main functions of the fault recording device include:
(1) the recorded fault process oscillogram correctly reflects the fault types, the phase classes, the numerical values of the fault current and the fault voltage, the tripping and closing time of the breaker, whether reclosing is successful and the like, correctly analyzes the accident reasons, researches countermeasures, correctly and clearly knows the condition of the system and timely processes the accident;
(2) according to the recorded oscillogram, the correctness of the relay protection and the working of the automatic device are correctly evaluated;
(3) according to the zero sequence current value shown in the wave recording diagram, giving a fault point range and searching a fault point;
(4) analyzing and researching the oscillation rule and providing a basis for improving relay protection and an automatic device;
(5) analyzing the recording chart to find the defects of the relay protection and the automatic device and the defects of the primary equipment;
(6) the system parameters and the running state of the monitoring system can be measured by the aid of a wave recording device;
in conclusion, the fault recorder can be used for correctly analyzing accidents, evaluating protection, finding problems of protection and a breaker, reducing accidents with unknown reasons to the maximum extent and playing an important role in power grid accident analysis.
However, the fault wave recording device in the prior art is often arranged in a large-scale case, and includes an ultrahigh-precision sensor, a large-scale sensor for high voltage, a large data storage and the like, so that the fault wave recording device is difficult to popularize in more power fault scenes due to the large size of the fault wave recording device, and for a common wave recording scene, the independent arrangement of the fault wave recording device invisibly increases the operation cost and reduces the work efficiency due to the inconvenient movement of the large-scale case.
Disclosure of Invention
The invention solves the problems that in the prior art, a fault recording device is often arranged in a large case, so that the fault recording device is difficult to popularize in more power fault scenes, and the device is arranged independently to increase the operation cost and reduce the working efficiency in common recording scenes due to the inconvenience in moving the large case, and provides an optimized portable fault recording monitor and a recording monitoring method thereof.
The technical scheme includes that the portable fault recording monitor is characterized in that a control panel is arranged in the monitor, a control circuit is arranged on the control panel, the control circuit is connected with a sampling unit, and a communication interface is arranged on the control circuit in a matched mode.
Preferably, the sampling unit comprises an open type current transformer, a current amplifying circuit and a filter circuit which are connected in sequence, and the filter circuit is connected to the control circuit.
Preferably, two ends of the primary side of the open type current transformer are provided with sampling probes; and safety switches are arranged among the sampling probes and/or any sampling probe.
Preferably, the control circuit is further connected with a relay, and the relay is connected to an LED indicating lamp.
A wave recording monitoring method adopting a portable fault wave recording monitor comprises the following steps:
step 1: initializing a control circuit;
step 2: the sampling end of the sampling unit is erected on a wire to be monitored, and corresponding initial current is obtained;
and 3, step 3: pre-processing the initial current;
and 4, step 4: loading the pretreated current into a control circuit;
and 5: the control circuit obtains current, analyzes the current and obtains current waveform data;
step 6: judging whether a receiver exists, if so, transmitting the current waveform data and the current waveform to a communication interface of the receiver through the communication interface in a data stream mode, and carrying out the next step, otherwise, storing the current waveform data and the current waveform into a database and covering the data before the preset time, and repeating the step 2;
and 7: the receiving party obtains current waveform data and current waveforms, and displays the current waveforms on the constructed coordinate system;
and 8: the database releases the current waveform data and current waveform, waits for the next sample and repeats step 2, or shuts down.
Preferably, the step 3 comprises the steps of:
step 3.1: amplifying the initial current obtained by sampling by using a current amplifying circuit;
step 3.2: filtering the amplified current through a filter circuit to filter low-frequency noise and power frequency interference;
step 3.3: and taking the filtered current as the preprocessed current.
Preferably, the step 5 comprises the steps of:
step 5.1: the control circuit obtains current;
step 5.2: the control circuit analyzes the current by an analog-to-digital conversion unit;
step 5.3: and corresponding the obtained current waveforms to the current values in unit time one by one.
Preferably, in step 6, when there is a receiver, the following steps are performed:
step 6.1: acquiring a data request initiated by any detection terminal;
step 6.2: if the communication interface detects the data transmission carrier, the control circuit directly loads the current waveform data and the current waveform into a detection terminal of a receiver connected with the data transmission carrier in a data stream mode, and if not, the next step is carried out;
step 6.3: receiving a data packet of a detection terminal initiating a data request, searching verification code information of an annotation column in the data packet, if the verification code is correct and the IP address is not a blacklist address, carrying out the next step, and if not, refusing to send data;
step 6.4: the control circuit sends a data packet through a communication interface, an annotation column of the data packet comprises a verification passing information identifier, and a receiving space is allocated and a coordinate system is established after the data packet is received by the detection terminal;
step 6.5: the current waveform data and the current waveform are transmitted to a communication interface of a receiving party in the form of a data stream through a communication interface matched with the control circuit.
Preferably, in step 7, after obtaining the current waveform data and the current waveform, the receiving party labels the current value in unit time on the already-constructed coordinate system, displays the current waveform on the coordinate system, and synchronously adjusts the current value in unit time that is misaligned, so that the label of the current value in unit time coincides with the current waveform.
Preferably, the method further comprises a malfunction alarm; the current waveform is matched with data in a database, and when abnormal data abnormal movement occurs, the relay triggers the LED indicator lamp to give an alarm.
The invention provides an optimized portable fault recording monitor and a recording monitoring method thereof, wherein the work control of various modules is carried out through a control circuit on a control panel, after the control circuit is initialized, a sampling end of a sampling unit is erected on a wire to be monitored to obtain corresponding initial current, the current is loaded into the control circuit after being preprocessed, the control circuit analyzes the current to obtain current waveform data, when a receiver exists, the current waveform data and the current waveform are transmitted to a communication interface of the receiver through the communication interface in a data flow mode, the receiver can display the current waveform on a constructed coordinate system after obtaining the current waveform data and the current waveform, and meanwhile, a database of the control circuit releases the current waveform data and the current waveform to wait for next sampling or shutdown.
The invention can obtain the waveform data by simple means, for example, the combination of the current transformer and the microprocessor is adopted for obtaining and processing, the obtained data can be transmitted to a user end of a receiving party after receiving a transmission request, the fault recording monitor is corresponding to a non-high voltage working environment and does not need to store large data volume, so the whole fault recording monitor can be in a small-sized portable form, can be popularized in various power fault scenes, and has low manufacturing cost and running cost.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a schematic structural diagram of a control part of the fault recording monitor, wherein data are input to sampling probes at two ends of a left current transformer, and an LED indicator light connected with a relay is omitted.
Detailed Description
The present invention is described in further detail with reference to the following examples, but the scope of the present invention is not limited thereto.
The invention relates to a portable fault recording monitor, wherein a control panel is arranged in the monitor, a control circuit is arranged on the control panel, the control circuit is connected with a sampling unit, and the control circuit is provided with a communication interface in a matching way.
In the invention, a control panel is arranged in the monitor, and the control circuit on the control panel is used for controlling the work of various modules.
In the invention, after a control circuit is initialized, a sampling end of a sampling unit is erected on a wire to be monitored to obtain corresponding initial current, the current is loaded into the control circuit after being preprocessed, the control circuit analyzes the current to obtain current waveform data, when a receiving party exists, the current waveform data and the current waveform are transmitted to a communication interface of the receiving party through the communication interface in a data stream mode, the receiving party can display the current waveform on a constructed coordinate system after obtaining the current waveform data and the current waveform, and meanwhile, a database of the control circuit releases the current waveform data and the current waveform to wait for next sampling or shutdown.
In the invention, the communication interface may be a wireless communication interface or a USB interface, corresponding to the user side, such as a wireless communication interface or a data interface of the mobile phone side, or a bluetooth device may be configured at the communication interface to be adapted to the bluetooth device at the user side for data transmission. This is readily understood by those skilled in the art, and may be set by those skilled in the art depending on the particular function of the selected control circuit, such as a microprocessor.
In the invention, waveform data can be obtained by a simple means, for example, the combination of a current transformer and a microprocessor is adopted for obtaining and processing, the obtained data can be transmitted to a user end of a receiving party after receiving a transmission request, and the fault recording monitor is corresponding to a non-high-voltage working environment and does not need to store large data volume, so the whole fault recording monitor can be in a small-sized portable form, can be popularized in various power fault scenes, and has the advantages of low manufacturing cost and low running cost.
The sampling unit comprises an open type current transformer, a current amplifying circuit and a filter circuit which are connected in sequence, and the filter circuit is connected to the control circuit.
Two ends of the primary side of the open type current transformer are provided with sampling probes; and safety switches are arranged between the sampling probes and/or on any sampling probe.
In the invention, an open type current transformer is adopted for collecting current waveforms, and current data of a current circuit can be obtained by clamping a sampling probe, generally a hand-held sampling head, arranged at two sides of the input end of the current transformer on an electric wire to be monitored at any time, and the current data is transmitted to a control circuit through a current amplifying circuit and a filter circuit through a mutual inductor for subsequent processing.
In the invention, the current amplifying circuit is used for amplifying the current, so that the characteristics in the micro current can be amplified, and meanwhile, the current noise is filtered by the filter circuit to obtain the characteristic characteristics of the current.
In the invention, the related current waveform data is analyzed by a control circuit, generally arranged as a microprocessor, and transmitted to a designated end through a communication interface.
In the invention, in order to ensure the use safety of the sampling end of the current transformer, a safety switch can be arranged between the sampling probes, the safety switch can be arranged between 2 sampling probes, and can also be matched with any 1 sampling probe for arrangement, the working principle of the safety switch is slightly different, but when the current is overlarge, the connection relation between the fault recording monitor and a monitored line is cut off, and the safety of the fault recording monitor is ensured.
The control circuit is also connected with a relay, and the relay is connected to the LED indicating lamp.
According to the invention, the relay is arranged in the control circuit, when the control circuit is always in a working state, the relay is in a high potential state, so that the LED indicating lamp is always in a lighting state, and if the current fluctuates irregularly or is abnormal, the LED indicating lamp is stroboscopic or turned off, so that an operator can know the condition and check the condition quickly, and the device is suitable for monitoring multiple cables simultaneously.
The invention also relates to a wave recording monitoring method adopting the portable fault wave recording monitor, which obtains the relevant current waveform data of the current circuit by using a current transformer, analyzes the signal by using the control circuit and realizes the real-time uploading of the current waveform to the user terminal.
The method comprises the following steps.
Step 1: the control circuit is initialized.
Step 2: and (3) setting the sampling end of the sampling unit on a wire to be monitored to obtain corresponding initial current.
And 3, step 3: and preprocessing the initial current.
The step 3 comprises the following steps:
step 3.1: amplifying the initial current obtained by sampling by using a current amplifying circuit;
step 3.2: filtering the amplified current through a filter circuit to filter low-frequency noise and power frequency interference;
step 3.3: and taking the filtered current as the preprocessed current.
In the invention, the initial current is not processed, and the problems of noise and the like can occur, so that the current is amplified by the current amplifying circuit, the filtering of noise and power frequency interference can be more effectively carried out, and the smooth current wave which represents the actual waveform of the current is obtained.
And 4, step 4: and loading the preprocessed current into a control circuit.
And 5: the control circuit obtains the current, analyzes the current and obtains current waveform data.
The step 5 comprises the following steps:
step 5.1: the control circuit obtains current;
step 5.2: the control circuit analyzes the current by an analog-to-digital conversion unit;
step 5.3: and corresponding the obtained current waveforms to the current values in unit time one by one.
In the invention, the current waveform is obtained by the sampling unit, the control circuit analyzes by the analog-to-digital conversion unit, and the obtained current data and the current waveform are in one-to-one correspondence, thereby facilitating the calibration after the subsequent transmission and ensuring that the analysis and the display of the waveform are more accurate.
Step 6: and (3) judging whether a receiver exists, if so, transmitting the current waveform data and the current waveform to a communication interface of the receiver through the communication interface in a data stream mode, and carrying out the next step, otherwise, storing the current waveform data and the current waveform into a database and covering the data before the preset time, and repeating the step (2).
In step 6, when there is a receiver, the following steps are performed:
step 6.1: acquiring a data request initiated by any detection terminal;
step 6.2: if the communication interface detects the data transmission carrier, the control circuit directly loads the current waveform data and the current waveform into a detection terminal of a receiver connected with the data transmission carrier in a data stream mode, and if not, the next step is carried out;
step 6.3: receiving a data packet of a detection terminal initiating a data request, searching for verification code information of an annotation column in the data packet, if the verification code is correct and the IP address is not a blacklist address, performing the next step, and if not, refusing to send data;
step 6.4: the control circuit sends a data packet through the communication interface, an annotation column of the data packet comprises a verification passing information identifier, and after the data packet is received by the detection terminal, a receiving space is distributed to establish a coordinate system;
step 6.5: the current waveform data and the current waveform are transmitted to a communication interface of a receiving party in the form of a data stream through a communication interface matched with the control circuit.
In the invention, the control circuit judges the mode to transmit data when receiving the data request.
In the invention, when a data transmission carrier such as a data line is detected, the direct adaptation relation exists between the detection terminal and the monitor, so that the current waveform data and the current waveform are directly transmitted to the detection terminal in a data stream form.
In the invention, when a data transmission carrier is not detected, the detection terminal is indicated to acquire data in a wireless transmission mode, whether verification code information exists in an annotation column of a data packet sent by the detection terminal is detected according to a special working mode of a monitor, the verification code is placed in the annotation column, a control circuit does not need to directly operate the data packet, and trojan and the like are prevented from being implanted; and if and only if the verification code is correct and the IP is not black, performing subsequent transmission action, and otherwise, directly rejecting.
In the invention, a control circuit sends a data packet, the content in an annotation column of the data packet is modified into a verification passing information identifier, a detection terminal distributes a receiving space after receiving the verification passing information identifier, a coordinate system is established, generally, the detection terminal needs to send completion information again after the completion, and if the completion information is not sent, the control circuit actively sends current waveform data and current waveforms in a data stream form after a preset time T.
And 7: the receiving side obtains the current waveform data and the current waveform, and displays the current waveform on the already constructed coordinate system.
In step 7, after obtaining the current waveform data and the current waveform, the receiver marks the current value in unit time on the already-constructed coordinate system, displays the current waveform on the coordinate system, and synchronously adjusts the current value in unit time, which is dislocated, so that the marking of the current value in unit time coincides with the current waveform.
In the present invention, in fact, the monitor transmits current waveform data and a current waveform, and the current waveform is constructed in the form of data.
In the invention, due to the limitation of transmission, when the current value in unit time is staggered, synchronous adjustment can be carried out, so that the label of the current value in unit time is superposed with the current waveform.
In the invention, the current waveform can be displayed on a detection terminal of a receiver, such as a mobile phone in real time through APP, and the functions of screenshot, operation and the like can be reserved based on the functions of the mobile phone.
And step 8: the database releases the current waveform data and current waveform, waits for the next sample and repeats step 2, or shuts down.
In the invention, the monitor does not store a large amount of data, and can be small and portable.
The method further comprises a fault alarm; the current waveform is matched with data in a database, and when abnormal data change occurs, the relay triggers the LED indicator lamp to give an alarm.
In the invention, when abnormal change occurs in the current, the relay may have high-low position change, so that the LED indicator light is triggered to generate stroboscopic and alarm, and an operator can obtain the change information of the current at the first time.
In the invention, when the current is too high, the monitor can carry out automatic or passive protection, and the safety switch is closed or opened under different setting modes of the safety switch.
The invention carries out the work control of various modules through a control circuit on a control panel, after the control circuit is initialized, a sampling end of a sampling unit is erected on a wire needing to be monitored to obtain corresponding initial current, the current is loaded into the control circuit after the pre-processing, the control circuit obtains current waveform data after analyzing the current, when a receiving party exists, the current waveform data and the current waveform are transmitted to a communication interface of the receiving party through the communication interface in a data flow mode, the receiving party can display the current waveform on a constructed coordinate system after obtaining the current waveform data and the current waveform, and meanwhile, a database of the control circuit releases the current waveform data and the current waveform to wait for the next sampling or stopping.
The invention can obtain the waveform data by simple means, for example, the combination of the current transformer and the microprocessor is adopted for obtaining and processing, the obtained data can be transmitted to a user end of a receiving party after receiving a transmission request, the fault recording monitor is corresponding to a non-high voltage working environment and does not need to store large data volume, so the whole fault recording monitor can be in a small-sized portable form, can be popularized in various power fault scenes, and has low manufacturing cost and running cost.
Claims (5)
1. A recording monitoring method of a portable fault recording monitor is characterized by comprising the following steps: a control panel is arranged in the monitor, a control circuit is arranged on the control panel, the control circuit is connected with a sampling unit, and the control circuit is provided with a communication interface in a matching way; the sampling unit comprises an open type current transformer, a current amplifying circuit and a filter circuit which are sequentially connected, and the filter circuit is connected to the control circuit; two ends of the primary side of the open type current transformer are provided with sampling probes; safety switches are arranged among the sampling probes and/or any sampling probe; the control circuit is also connected with a relay, and the relay is connected to the LED indicator light;
the method comprises the following steps:
step 1: initializing a control circuit;
and 2, step: the sampling end of the sampling unit is erected on a wire to be monitored to obtain corresponding initial current;
and 3, step 3: pre-processing the initial current;
and 4, step 4: loading the pretreated current into a control circuit;
and 5: the control circuit obtains current, analyzes the current and obtains current waveform data;
and 6: judging whether a receiver exists or not, if not, storing the current waveform data and the current waveform into a database and covering the data before the preset time, repeating the step 2, and if the receiver exists, performing the following steps:
step 6.1: acquiring a data request initiated by any detection terminal;
step 6.2: if the communication interface detects the data transmission carrier, the control circuit directly loads the current waveform data and the current waveform into a detection terminal of a receiver connected with the data transmission carrier in a data stream mode, and if not, the next step is carried out;
step 6.3: receiving a data packet of a detection terminal initiating a data request, searching for verification code information of an annotation column in the data packet, if the verification code is correct and the IP address is not a blacklist address, performing the next step, and if not, refusing to send data;
step 6.4: the control circuit sends a data packet through a communication interface, an annotation column of the data packet comprises a verification passing information identifier, and a receiving space is allocated and a coordinate system is established after the data packet is received by the detection terminal;
step 6.5: the current waveform data and the current waveform are transmitted to a communication interface of a receiver in a data stream form through a communication interface matched with the control circuit;
and 7: the receiver obtains current waveform data and current waveforms, and displays the current waveforms on the constructed coordinate system;
and step 8: the database releases the current waveform data and current waveform, waits for the next sample and repeats step 2, or shuts down.
2. The recording monitoring method of the portable fault recording monitor according to claim 1, characterized in that: the step 3 comprises the following steps:
step 3.1: amplifying the initial current obtained by sampling by using a current amplifying circuit;
step 3.2: filtering the amplified current through a filter circuit to filter low-frequency noise and power frequency interference;
step 3.3: and taking the filtered current as the preprocessed current.
3. The recording monitoring method of the portable fault recording monitor according to claim 1, characterized in that: the step 5 comprises the following steps:
step 5.1: the control circuit obtains current;
step 5.2: the control circuit analyzes the current by an analog-to-digital conversion unit;
step 5.3: and corresponding the obtained current waveforms to the current values in unit time one by one.
4. The recording monitoring method of the portable fault recording monitor according to claim 1, characterized in that: in step 7, after obtaining the current waveform data and the current waveform, the receiver marks the current value in unit time on the already-constructed coordinate system, displays the current waveform on the coordinate system, and synchronously adjusts the current value in unit time, which is dislocated, so that the marking of the current value in unit time coincides with the current waveform.
5. The recording monitoring method of the portable fault recording monitor according to claim 1, characterized in that: the method further comprises a fault alarm; the current waveform is matched with data in a database, and when abnormal data abnormal movement occurs, the relay triggers the LED indicator lamp to give an alarm.
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