CN114779018A - Detection system and method based on circuit loss calculation - Google Patents
Detection system and method based on circuit loss calculation Download PDFInfo
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- G—PHYSICS
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- 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
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- G—PHYSICS
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- 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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
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- G—PHYSICS
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- 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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2817—Environmental-, stress-, or burn-in tests
Abstract
The invention relates to the technical field of electric power, in particular to a detection system and a detection method based on circuit loss calculation, which comprises a microprocessor, a master control end of a system and a control end, wherein the microprocessor is used for sending an execution command to be executed by a lower module; for storing power parameter data; the communication module is used for establishing a data transmission network and providing the data transmission network to each power system for data interaction; the electric parameter acquisition module is used for acquiring the current data acquisition stages of the current sensor and the voltage sensor and confirming the detection loss grade; the voice generation module is used for analyzing whether the loss grade acquired from the microprocessor is suitable for the long-term power system; a voice signal generator for setting a trigger loss threshold with reference to the power parameter data detected in the microprocessor; the invention solves the problems that the current power detection technology needs to test the working error of the mutual inductor, test the loss of the line and timely process the line with abnormal line loss, and improves the reliability and safety of detecting the circuit loss.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a detection system and a detection method based on circuit loss calculation.
Background
At present, the standby power of a power supply with the rated power less than 50W is required to be not more than 0.3W, the standby loss of the power supply with the rated power more than 50W and less than 250W is required to be not more than 0.5W, and the requirement on the standby loss of the power supply is stricter and stricter along with the passage of time.
The mutual inductor and the line are an organic whole, and the mutual inductor provides necessary testing standardized conditions for measuring the voltage at the head end of the circuit and outputting electric energy. Once a problem occurs in a secondary low-voltage circuit of the electric energy meter, the mutual inductor or the secondary output of the mutual inductor can influence a metering error and a protection system. Similarly, when a problem occurs in a high-voltage line for transmitting electric power, a metering signal output by the transformer is abnormal, and finally an abnormal value occurs in electric energy charging. For example, if the intermediate point of the line is short-circuited, the electric energy delivered to the user is reduced, but the charging end of the transformer is a total charging, so that the electric energy value of the output end of the transformer at the user end (the end of the line) needs to be checked. Therefore, when a line fails, the loss and voltage drop of the line are abnormal, which causes the electric energy metering values at the head end and the tail end of the line to deviate from the normal level seriously.
The current transformer error and line loss test has the following problems: when the line loss is tested, signals are collected from the mutual inductors on two sides of the line, then the difference value of the related power is calculated, and the error of the mutual inductor is ignored. If the line loss ratio is 7%, but the mutual inductors at two ends have a negative deviation of 2%, the actually measured line loss result is 5%, and the line loss is considered to be good by mistake. The current line loss testing device also can directly obtain the energy or the power difference of data calculation circuit both sides from the electric energy meter, and this kind of mode has not only ignored the mutual-inductor error, has also ignored mutual-inductor secondary circuit, and if the return circuit between mutual-inductor to the ammeter goes wrong promptly, the count of ammeter naturally has the deviation, and this kind of data are used for calculating the line loss and are inaccurate. Once the line loss is considered to exceed the standard, a line loss testing device has no scheme for quickly diagnosing fault positions. Due to the lack of an integrated device capable of testing the errors of the mutual inductor, the secondary circuit of the mutual inductor and the loss of the power line, the problems that the use efficiency of a plurality of devices is not high, the cooperativity is poor, the data management efficiency is low and the like are caused.
Therefore, it is necessary to test the working error of the transformer, test the loss of the line, and timely handle the line with abnormal line loss, so as to ensure the normal transmission of the power to the end user and the benefit of both the power supplier and the power consumer.
Disclosure of Invention
Solves the technical problem
Aiming at the defects in the prior art, the invention provides a detection system and a detection method based on circuit loss calculation, which solve the problem that the current power detection technology needs to test the working error of a mutual inductor, test the loss of a line and timely process the line with abnormal line loss.
Technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, a detection system based on circuit loss calculation includes: including main machine of testing and at least one machine under test, main machine of testing with machine under test shares same detecting system, wherein:
the microprocessor is a master control end of the system and is used for sending an execution command to be executed by a lower module; for storing power parameter data;
the communication module is used for establishing a data transmission network and providing the data transmission network to each power system for data interaction;
the electric parameter acquisition module is used for acquiring the current data acquisition stages of the current sensor and the voltage sensor and confirming the detection loss grade;
the voice generation module is used for analyzing whether the loss grade acquired from the microprocessor is suitable for the long-term power system;
a voice signal generator for setting a trigger loss threshold with reference to the power parameter data detected in the microprocessor;
and the voice playing module is used for playing the position of the tested machine and performing corresponding detection maintenance processing.
Furthermore, a subordinate sub-module is connected to the microprocessor, and comprises:
the digital temperature and humidity sensor is used for authorizing the main testing machine to log in the system authority to acquire temperature and humidity information of the tested machine from a cloud database;
the GPS module is used for the microprocessor to acquire the position information of the tested machine and carry out positioning processing on the tested machine;
and the fault positioning module is used for establishing a data transmission interaction channel and providing the data transmission interaction channel to the host computer end and the tested computer end for fault processing.
Furthermore, the electrical parameter acquisition module sends an instruction to the microprocessor, and the microprocessor loads a unique identifier for the power supply signal output by the main testing machine after receiving the instruction;
the manner in which the speech signal generator performs the loss threshold signal trigger includes:
the method comprises the following steps that periodic cycle triggering is carried out, a microprocessor is provided with a timer circuit or a timer module, and the timer circuit or the timer module sends instructions to a voice signal generator at the same interval time;
the external start trigger is provided with a network communication module, and the voice generation module sends an instruction to the voice signal generator after receiving an external control instruction.
Furthermore, the fault location module is one or a combination of a plurality of time domain reflectometer, a frequency scanner, an impedance frequency spectrograph, a vector network analyzer and a frequency domain reflectometer.
Furthermore, the electrical parameter acquisition modules all adopt the same acquisition structure, and the acquisition structure comprises one of an analog-to-digital converter with a microprocessor, a metering chip with a microprocessor, a microprocessor and metering chip combination module, a single-phase electric energy meter and a three-phase electric energy meter.
In a second aspect, a detection method based on circuit loss calculation, a test case a method includes the following steps:
StepA 1: the electrical parameters at two sides of the line are directly obtained through a high-voltage measurement mode, or the electrical parameters at two sides of the line are measured through a mutual inductor, but the error of the mutual inductor can be ignored;
StepA 2: the main testing machine and the tested machine carry out time synchronization through a GPS or the Internet, and the main testing machine and the tested machine respectively acquire electrical parameters of the first section and the tail end of the measured line;
StepA 3: the method comprises the steps that a main testing machine receives data of a tested machine through a network, or the tested machine receives the data of the main testing machine through the network, or an internet platform receives the data of the tested machine of the main testing machine obtained at the same time, the difference value of electrical parameters of the main testing machine and the tested machine is calculated, and the loss of a line is obtained through the difference value;
StepA 4: and when the difference between the electromechanical parameters obtained by the A3 and the electromechanical parameters to be tested exceeds a set value, testing and fault locating the line by the main testing machine.
Still further, the test case B method includes the steps of:
StepB 1: measuring electrical parameters of two sides of a line through a mutual inductor, wherein the error of the mutual inductor is not negligible;
StepB 2: the main testing machine and the tested machine carry out time synchronization through a GPS or the Internet; respectively acquiring electrical parameters of the head section and the tail end of a measured line by a main measuring machine and a measured machine;
StepB 3: the main testing machine calculates the error of the mutual inductor through the secondary electric parameter and the grounding current parameter of the mutual inductor or inputs the error of the mutual inductor through historical data;
StepB 4: the method includes the steps that a master measuring machine receives data of a measured machine through a network, or the measured machine receives the data of the master measuring machine through the network, or an internet platform receives the data of the master measuring machine and the measured machine obtained at the same time, a difference value W between electrical parameters of the master measuring machine and the measured machine is calculated, and loss of a line is obtained after the margin W is corrected through an error of a transformer;
StepB 5: and when the difference between the electromechanical parameters of the main testing machine and the tested electromechanical parameters obtained by B4 exceeds a specified value, testing and fault positioning are carried out on the line through the main testing machine.
Further, the process of calculating the difference between the electromechanical parameters of the main testing machine and the tested electromechanical parameters is as follows:
the main testing machine and the tested machine respectively collect head end voltage, current and power factor values of the power line, and calculate active power, reactive power, active electric energy, reactive electric energy and harmonic waves;
calculating the active electric energy difference between the main testing machine and the tested machine as functional quantity loss;
calculating the reactive power difference between the main testing machine and the tested machine to be used as reactive energy loss, and calculating the voltage difference between the main testing machine and the tested machine to be used as line voltage drop; calculating the power factor difference between the head end and the tail end as the insulation medium loss; the harmonic quantity difference between the head end and the tail end is calculated as the harmonic loss.
Further, line loss is considered to be excessive when it is found that there is a voltage drop or active power loss or reactive loss or functional power loss or reactive energy loss or harmonic loss exceeding a design value or a management value;
and when the measured power line is a part of the branch line, and whether the measured power line exceeds the designed loss threshold value cannot be determined through calculation values, estimating a multiple relation K between the total length and the measured power line length, and when the K times of the loss value exceeds the designed value or the management value, considering that the line loss is overlarge.
Furthermore, when the line loss is considered to be overlarge, fault defect positioning is carried out on the secondary circuit or the power line of the mutual inductor; the method comprises the steps that at least one tested machine is added between a main tested machine at the head end and a tested machine at the tail end to serve as a relay module to achieve data communication; the main testing machine and the tested machine realize point-to-point communication through wired or wireless communication; when the tested line is in power failure, a direct current or alternating current signal is injected into the tested line through the signal generator to enable the tested line to work in an electrified mode.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
1. the invention considers the condition that the collected electric parameters at two ends of the electric power circuit are directly measured or measured by a mutual inductor; the line loss test and communication of a plurality of sections of power lines can be completed through the matching of the main testing machine and the tested machine, and the fault location of the lines can be carried out after the loss of the power lines exceeds a specified value.
2. The method can be suitable for monitoring or inspecting the regional power line loss and line nodes of large-scale regional power grids or complex factories and mines or equipment in a live-line manner, for example, by combining a visual first section, the method can carry out real-time observation and overall management on abnormal nodes of the regional power grid structure, and the hardware structure (such as an algorithm of a reference embodiment) of the method can also be used for measuring and diagnosing errors of voltage and/or current transformers running in the line nodes and secondary loops of the voltage and/or current transformers.
3. The invention can carry out line loss test in a power failure state and a charged state, and considers the condition that the acquisition of electric parameters at two ends of the power line is directly measured or measured by a mutual inductor; if the transformer is included, key secondary quantity and grounding quantity required by collecting and monitoring the transformer error are considered; the line loss test and communication of a plurality of sections of lines can be completed through the matching of the main testing machine and the tested machine, and the lines and fault positioning can be checked by utilizing a fault test module arranged in the main testing machine after the line loss exceeds a specified value. The invention can also find the line aging through the loss and diagnose the service life of the line.
Drawings
In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a detection system based on circuit loss calculation;
FIG. 2 is a schematic flow chart of a detection method A based on circuit loss calculation;
FIG. 3 is a schematic flow chart of a detection method B based on circuit loss calculation;
the reference numerals in the drawings denote: 1. a microprocessor; 2. a communication module; 3. a display; 4. a digital temperature and humidity sensor; 5. a GPS module; 6. a fault location module; 7. an electrical parameter acquisition module; 8. A current sensor; 9. a current sensor; 10. a voice generation module; 11. a voice signal generator; 12. and a voice playing module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The present invention will be further described with reference to the following examples.
Example 1
A detection system based on circuit loss calculation of this embodiment, as shown in fig. 1, includes a main test machine and at least one tested machine, where the main test machine and the tested machine share the same detection system, where:
the microprocessor 1 is a master control end of the system and is used for sending an execution command to be executed by a lower module; for storing power parameter data;
the communication module 2 is used for establishing a data transmission network and providing the data transmission network to each power system for data interaction;
the electric parameter acquisition module 7 is used for acquiring the current data acquisition stages of the current sensor 8 and the voltage sensor 9 and confirming the detection loss grade;
the voice generating module 10 is used for analyzing whether the loss grade acquired in the microprocessor 1 is suitable for the long-term power system;
a voice signal generator 11 for setting a trigger loss threshold value with reference to the power parameter data detected in the microprocessor 1;
and the voice playing module 12 is used for playing the position of the tested machine and performing corresponding detection maintenance processing.
The microprocessor 1 is connected with a subordinate submodule, and comprises:
the digital temperature and humidity sensor 4 is used for authorizing the main testing machine to log in the system authority to acquire temperature and humidity information of the tested machine from a cloud database;
the GPS module 5 is used for the microprocessor 1 to acquire the position information of the tested machine and carry out positioning processing on the tested machine;
and the fault positioning module 6 is used for establishing a data transmission interaction channel and providing the data transmission interaction channel to the host computer end and the tested computer end for fault processing.
The microprocessor 1 further comprises a display 3 connected with the communication module 2; the display 3 adopts one of a serial port screen, an LCD, an OLED and a TFT screen.
The electrical parameter acquisition module 7 sends an instruction to the microprocessor 1, and the microprocessor 1 loads a unique identifier for a power supply signal output by the main testing machine after receiving the instruction;
the manner in which the speech signal generator 11 performs the loss threshold signal triggering includes:
the method comprises the following steps that periodic cycle triggering is carried out, a microprocessor 1 is provided with a timer circuit or a timer module, and the timer circuit or the timer module sends instructions to a voice signal generator 11 at the same time interval;
the external start trigger is provided with a network communication module, and the voice generation module 10 sends an instruction to the voice signal generator 11 after receiving an external control instruction.
The fault positioning module 6 is one or a combination of a time domain reflectometer, a frequency scanner, an impedance frequency spectrograph, a vector network analyzer and a frequency domain reflectometer.
The electric parameter acquisition modules 7 all adopt the same acquisition structure, and the acquisition structure comprises an analog-to-digital converter with a microprocessor, a metering chip with a microprocessor, a microprocessor and metering chip combined module, a single-phase electric energy meter and a three-phase electric energy meter.
Example 2
In a specific implementation aspect, on the basis of embodiment 1, this embodiment further specifically describes the daily protection system for a stroke patient in embodiment 1 with reference to fig. 1, and a detection method based on circuit loss calculation, as shown in fig. 2 and fig. 3, a test condition a method includes the following steps:
StepA 1: the electrical parameters at two sides of the line are directly obtained through a high-voltage measurement mode, or the electrical parameters at two sides of the line are measured through a mutual inductor, but the error of the mutual inductor can be ignored;
StepA 2: the main testing machine and the tested machine carry out time synchronization through a GPS or the Internet, and the main testing machine and the tested machine respectively collect the electrical parameters of the first section and the tail end of the tested line;
StepA 3: the method comprises the steps that a main testing machine receives data of a tested machine through a network, or the tested machine receives the data of the main testing machine through the network, or an internet platform receives the data of the tested machine of the main testing machine obtained at the same time, the difference value of electrical parameters of the main testing machine and the tested machine is calculated, and the loss of a line is obtained through the difference value;
StepA 4: and when the difference between the electromechanical parameters obtained by the A3 and the electromechanical parameters to be tested exceeds a set value, testing and fault positioning are carried out on the line through the main testing machine.
The test case B method includes the steps of:
StepB 1: measuring electrical parameters of two sides of a line through a mutual inductor, wherein the error of the mutual inductor is not negligible;
StepB 2: the main testing machine and the tested machine carry out time synchronization through a GPS or the Internet; the main testing machine and the tested machine respectively collect the electrical parameters of the first section and the tail end of the measured line;
StepB 3: the main measuring machine calculates the error of the mutual inductor through the secondary electric parameter and the grounding current parameter of the mutual inductor or inputs the error of the mutual inductor through historical data;
StepB 4: the method includes the steps that a master measuring machine receives data of a measured machine through a network, or the measured machine receives the data of the master measuring machine through the network, or an internet platform receives the data of the master measuring machine and the measured machine obtained at the same time, a difference value W between electrical parameters of the master measuring machine and the measured machine is calculated, and loss of a line is obtained after the margin W is corrected through an error of a transformer;
StepB 5: and when the difference between the electromechanical parameters of the main testing machine and the tested electromechanical parameters obtained by B4 exceeds a specified value, testing and fault positioning are carried out on the line through the main testing machine.
The process of calculating the difference value of the electromechanical parameters of the main testing machine and the tested electromechanical parameters is as follows:
the main testing machine and the tested machine respectively collect the voltage, current and power factor values of the head end of the power line, and calculate active power, reactive power, active electric energy, reactive electric energy and harmonic wave;
calculating the active electric energy difference between the main testing machine and the tested machine as functional quantity loss;
calculating the reactive power difference between the main testing machine and the tested machine to be used as reactive energy loss, and calculating the voltage difference between the main testing machine and the tested machine to be used as line voltage drop; calculating the power factor difference between the head end and the tail end as the insulation medium loss; the harmonic loss is calculated as the difference in harmonic content at the head end and the tail end.
When voltage drop or active power loss or reactive loss or functional loss or reactive energy loss or harmonic loss is found to exceed a design value or a management value, the line loss is considered to be too large;
when the measured power line is a part of the branch line, and whether the measured power line exceeds the designed loss threshold value cannot be determined through a calculation value, estimating a multiple relation K of the total length and the length of the measured power line, and when the K times of the loss value exceeds the designed value or a management value, considering that the line loss is overlarge. Typical design or regulatory values are 5-11%.
When the line loss is considered to be overlarge, fault defect positioning is carried out on a secondary circuit or a power line of the mutual inductor; the data communication is realized by adding at least one tested machine between a main tested machine at the head end and a tested machine at the tail end as a relay module; the main testing machine and the tested machine realize point-to-point communication through wired or wireless communication; when the tested line is in power failure, a direct current or alternating current signal is injected into the tested line through the signal generator to enable the tested line to work in an electrified mode.
When the line loss is considered to be overlarge, fault defect positioning is carried out on a secondary circuit or a power line of the mutual inductor: when any end of two sides of the line is not provided with non-detachable parallel equipment, the fault positioning test signal access condition is met, a single-end test method is adopted, otherwise a double-end test method is adopted;
when the line loss is considered to be overlarge, fault defect positioning is carried out on a secondary circuit or a power line of the mutual inductor: when no non-detachable parallel equipment is arranged at any end of two sides of the line, when the fault positioning module is a vector network analyzer or a frequency domain reflector or a sweep frequency instrument or an impedance frequency spectrograph, the vector network analyzer or the frequency domain reflector or the sweep frequency instrument or the impedance frequency spectrograph transmits sweep frequency signals from any end point of two sides of the line to obtain at least one of a reflection frequency spectrum, an impedance frequency spectrum, a phase frequency spectrum and a return loss frequency spectrum in a sweep frequency mode, then the obtained frequency spectrum is subjected to Fourier transform to obtain a time domain map, and then time domain coordinates of the time domain map are transformed; observing whether the mutation point on the time domain map is an intermediate joint or a fault point;
the double-end test method is characterized in that double-end monitoring is adopted to inject waveform signals to realize fault positioning:
injecting a signal generated by a signal generator into the head end of the line, starting an electrical parameter acquisition module to acquire the waveforms of a main tester at the head end of the line and a tested tester at the tail end of the line, and analyzing the waveform time difference between an injection end and the tail end to perform fault positioning;
the method for injecting signals into the double-end test method line comprises the following steps: when the line is in power failure and the head end is provided with a metal piece which can be connected, a voltage signal is directly injected through the wire clamp; when the line is powered off and does not have a metal connecting piece to directly inject signals or the line is electrified, the signals are injected into the CT through the signal generator, and the CT is clamped into the line to be tested to generate coupling current to inject the signals.
The invention can carry out line loss test in a power failure state and a charged state, and considers the condition that the collected electric parameters at two ends of the electric power line are directly measured or measured by a mutual inductor; if the transformer is included, key secondary quantity and grounding quantity required by collecting and monitoring the transformer error are considered; the line loss test and communication of a plurality of sections of lines can be completed through the matching of the main testing machine and the tested machine, and the lines and the fault location can be checked by utilizing a fault test module arranged in the main testing machine after the line loss exceeds a specified value. The invention can also find the line aging through the loss and diagnose the service life of the line.
The invention considers the condition that the collected electric parameters at two ends of the electric power circuit are directly measured or measured by a mutual inductor; the line loss test and communication of a plurality of sections of power lines can be completed through the matching of the main testing machine and the tested machine, and the fault location of the lines can be carried out after the loss of the power lines exceeds a specified value.
The method can be suitable for monitoring or inspecting the regional power line loss and line nodes of large-scale regional power grids or complex factories and mines or equipment in a live-line manner, for example, by combining a visual first section, the method can carry out real-time observation and overall management on abnormal nodes of the regional power grid structure, and the hardware structure (such as an algorithm of a reference embodiment) of the method can also be used for measuring and diagnosing errors of voltage and/or current transformers running in the line nodes and secondary loops of the voltage and/or current transformers.
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 should 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; 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 (10)
1. A detection system based on circuit loss calculation is characterized by comprising a main testing machine and at least one tested machine, wherein the main testing machine and the tested machine share the same detection system, and the detection system comprises:
the microprocessor (1) is a master control end of the system and is used for sending an execution command to be executed by a lower module; for storing power parameter data;
the communication module (2) is used for establishing a data transmission network and providing the data transmission network to each power system for data interaction;
the electric parameter acquisition module (7) is used for acquiring the current data acquisition stage of the current sensor (8) and the voltage sensor (9) and confirming the detection loss grade;
the voice generating module (10) is used for analyzing whether the loss grade acquired from the microprocessor (1) is suitable for the power system in the long term;
a voice signal generator (11) for setting a trigger loss threshold with reference to the power parameter data detected in the microprocessor (1);
and the voice playing module (12) is used for playing the position of the tested machine and performing corresponding detection maintenance processing.
2. The detection system based on circuit loss calculation according to claim 1, wherein a subordinate submodule is connected in the microprocessor (1), and comprises:
the digital temperature and humidity sensor (4) is used for authorizing the main testing machine to log in the system authority to acquire temperature and humidity information of the tested machine from a cloud database;
the GPS module (5) is used for the microprocessor (1) to acquire the position information of the tested machine and carry out positioning processing on the tested machine;
and the fault positioning module (6) is used for establishing a data transmission interaction channel and providing the data transmission interaction channel to the host computer end and the tested computer end for fault processing.
3. The detection system based on circuit loss calculation is characterized in that the electrical parameter acquisition module (7) sends an instruction to the microprocessor (1), and the microprocessor (1) loads a unique identifier for a power supply signal output by the main testing machine after receiving the instruction;
the voice signal generator (11) triggers the loss threshold signal in a manner that includes:
the method comprises the following steps that periodic cycle triggering is carried out, a microprocessor (1) is provided with a timer circuit or a timer module, and the timer circuit or the timer module sends instructions to a voice signal generator (11) at the same interval time;
the external start trigger is provided with a network communication module, and the voice generation module (10) sends an instruction to the voice signal generator (11) after receiving an external control instruction.
4. A detection system based on circuit loss calculation according to claim 2, characterized in that the fault location module (6) is one or a combination of several of a time domain reflectometer, a frequency scanner, an impedance spectrometer, a vector network analyzer, and a frequency domain reflectometer.
5. The detection system based on circuit loss calculation according to claim 1, wherein the electrical parameter acquisition modules (7) all adopt the same acquisition structure, and the acquisition structure comprises one of an analog-to-digital converter with a microprocessor, a metering chip with a microprocessor, a microprocessor and metering chip combination module, a single-phase electric energy meter and a three-phase electric energy meter.
6. A method for performing circuit loss computation based detection, the method being implemented in a circuit loss computation based detection system according to any one of claims 1-5, wherein the test case a method comprises the steps of:
StepA 1: the electrical parameters at two sides of the line are directly obtained in a high-voltage measurement mode, or the electrical parameters at two sides of the line are measured through a mutual inductor, but the error of the mutual inductor can be ignored;
StepA 2: the main testing machine and the tested machine carry out time synchronization through a GPS or the Internet, and the main testing machine and the tested machine respectively acquire electrical parameters of the first section and the tail end of the measured line;
StepA 3: the method comprises the steps that a main testing machine receives data of a tested machine through a network, or the tested machine receives the data of the main testing machine through the network, or an internet platform receives the data of the tested machine of the main testing machine obtained at the same time, the difference value of electrical parameters of the main testing machine and the tested machine is calculated, and the loss of a line is obtained through the difference value;
StepA 4: and when the difference between the electromechanical parameters obtained by the A3 and the electromechanical parameters to be tested exceeds a set value, testing and fault positioning are carried out on the line through the main testing machine.
7. The circuit loss calculation-based detection method according to claim 6, wherein the test case B method comprises the following steps:
StepB 1: measuring electrical parameters of two sides of a line through a mutual inductor, wherein the error of the mutual inductor is not negligible;
StepB 2: the main testing machine and the tested machine carry out time synchronization through a GPS or the Internet; the main testing machine and the tested machine respectively collect the electrical parameters of the first section and the tail end of the measured line;
StepB 3: the main measuring machine calculates the error of the mutual inductor through the secondary electric parameter and the grounding current parameter of the mutual inductor or inputs the error of the mutual inductor through historical data;
StepB 4: calculating the difference value W of the electrical parameters of the master measuring machine and the measured machine in a manner that the master measuring machine receives the measured machine data through the network, or the measured machine receives the master measuring machine data through the network, or the internet platform receives the measured machine data of the master measuring machine obtained at the same time, and correcting the difference value W through the error of the transformer to obtain the loss of the line;
StepB 5: and when the difference between the electromechanical parameters of the main testing machine and the tested electromechanical parameters obtained by the B4 exceeds a specified value, testing and fault positioning are carried out on the line through the main testing machine.
8. The method according to claim 7, wherein the process of calculating the difference between the parameters of the main tester and the tested electromechanical device is as follows:
the main testing machine and the tested machine respectively collect the voltage, current and power factor values of the head end of the power line, and calculate active power, reactive power, active electric energy, reactive electric energy and harmonic wave;
calculating the active electric energy difference between the main testing machine and the tested machine as functional quantity loss;
calculating the reactive power difference between the main testing machine and the tested machine to be used as reactive energy loss, and calculating the voltage difference between the main testing machine and the tested machine to be used as line voltage drop; calculating the power factor difference between the head end and the tail end as the insulation medium loss; the harmonic quantity difference between the head end and the tail end is calculated as the harmonic loss.
9. A detection method based on circuit loss calculation according to claim 8, characterized in that line losses are considered too large when it is found that there is a voltage drop or active power loss or reactive loss or functional quantity loss or reactive energy loss or harmonic loss that exceeds the design or management value;
when the measured power line is a part of the branch line, and whether the measured power line exceeds the designed loss threshold value cannot be determined through a calculation value, estimating a multiple relation K of the total length and the length of the measured power line, and when the K times of the loss value exceeds the designed value or a management value, considering that the line loss is overlarge.
10. The detection method based on circuit loss calculation is characterized in that when the line loss is considered to be excessive, fault defect location is carried out on a transformer secondary circuit or a power line; the data communication is realized by adding at least one tested machine between a main tested machine at the head end and a tested machine at the tail end as a relay module; the main testing machine and the tested machine realize point-to-point communication through wired or wireless communication; when the tested line is in power failure, a direct current or alternating current signal is injected into the tested line through the signal generator to enable the tested line to work in an electrified mode.
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