A load control terminal operation and maintenance detection device and method

Abstract

The present invention provides a load control terminal operation and maintenance detection device and method. The detection device specifically comprises a power supply module, a data communication module, a control processing module, a three-phase voltage and current output module, a measurement module and a display module; the detection device outputs voltage in the form of a battery-driven digital power amplifier to supply working power to the load control terminal; effectively promotes the normal power supply of the load control terminal, and the output signal is stable, reliable and efficient. Then, through the load control operation and maintenance detection method combined with the detection device, the data communication interface is connected to the load control terminal, and the active power and reactive power of each branch load of the three-phase lower level of the load control terminal can be read by RS-485 communication. At the same time, the standard power is calculated according to the output voltage and current inside the device, and compared with the read data, the terminal load branch wiring is efficiently and accurately judged, so as to provide data support for on-site maintenance, assist in completing the operation and maintenance detection safely and efficiently, and improve the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of load control operation and maintenance detection, and in particular to a load control terminal operation and maintenance detection device and method. Background Art

[0002] At present, when inspecting the load-bearing control site in the substation, staff usually need to carry a variety of testing equipment such as RS-485 interface testers and multimeters, and the operation process is cumbersome. A small generator is also required to provide power support for pre-power supply testing or power-off maintenance, and the shipment remains unchanged. The traditional three-phase voltage source uses a battery inverter output power supply method, which cannot drive the load-bearing control terminal to work, greatly affecting work efficiency.

[0003] The prior art CN201610362424.1 load control trip circuit control terminal timely monitors the fault condition of the on-site load control trip circuit, the reliability of the load switch and the energized condition of the back end of the load switch, and remotely transmits it to the main station via GPRS to issue an alarm prompt, providing a basis for judgment for orderly power management; due to the large number of lower-level load branches, this method cannot accurately determine the wiring faults of each phase branch, and cannot timely monitor fault information in a power outage state. Summary of the invention

[0004] The object of the present invention is to provide a load control terminal operation and maintenance detection device and method to solve the problems raised in the above background technology.

[0005] The present invention is implemented by the following technical solutions: In a first aspect, the present invention discloses a load control terminal operation and maintenance detection device, the detection device specifically comprises a power supply module, a data communication module, a control processing module, a three-phase voltage and current output module, a measurement module and a display module;

[0006] The power supply module is used to provide working voltage to each module of the detection device;

[0007] The data communication module is used to upload the detection data from the load control terminal to the control processing module;

[0008] The control processing module is used to issue communication instructions, obtain data through the data communication module for analysis and processing, or upload data and processing results through the data communication module;

[0009] The three-phase voltage and current output module is used to output three-phase voltage and three-phase current;

[0010] The measuring module is used to measure the values ​​of the output three-phase voltage and three-phase current;

[0011] The display module is used to display the detection data and calculation analysis results in real time.

[0012] Specifically, the power supply module includes a battery power supply unit, a charging control unit, and a DC-DC power conversion unit; the battery power supply unit is used to provide an electric energy storage carrier and is connected to the charging control unit. The charging control unit charges the battery power supply unit when the battery power is insufficient. The battery power supply unit is connected to the DC-DC power conversion unit to convert the output of the electric energy storage carrier to provide working voltage to each module of the device.

[0013] Specifically, the DC-DC power conversion unit has four output terminals, namely VDC1, VDC2, VDC3, and VDC4. The VDC1 terminal is used to power the control processing module and the display module. The VDC2 terminal is connected to the isolation power supply unit, and the isolated power supply is used to power the data communication module. The VDC3 terminal is connected to the reference power supply unit to provide a reference voltage Vref, and the VDC4 terminal is connected to the three-phase voltage and current output module to provide a driving voltage.

[0014] Specifically, the data communication module includes a Bluetooth communication unit and an RS-485 communication unit. The Bluetooth communication unit is connected to the handheld terminal to upload the detection data to the handheld terminal. The RS-485 communication unit is connected to the load control terminal to obtain the detection data of the load control terminal. The detection data includes three-phase power data, and the three-phase power data includes voltage, current, power factor, and active power.

[0015] Specifically, the three-phase voltage and current output module includes a voltage output unit and a current output unit for each phase:

[0016] Wherein, the voltage output unit includes a PWM modulation unit, a switch amplification unit, and a filter unit; the PWM modulation unit is used to modulate the input DC voltage VDC4, output a pulse signal whose pulse width is proportional to the DC voltage VDC4, and then amplify the input pulse signal through the switch amplification unit, and filter the high-frequency signal through the filter unit to obtain the output voltage and connect the L and N terminals of each phase output interface for output;

[0017] The current output unit includes a voltage transformer and a sampling resistor. The output voltage is converted by the voltage transformer and then passes through the sampling resistor to obtain an output current, which is connected to the loop interface of each phase current output.

[0018] Specifically, the display module displays the detection data and results in real time in multiple forms such as numerical statistical tables, phasor diagrams, wiring diagrams, and result description texts.

[0019] The second aspect of the present invention discloses a load control terminal operation and maintenance detection method, which is applied to the aforementioned detection device, and the method comprises the following steps:

[0020] Step S1, connecting the detection device to supply working power parameters to the load control terminal, wherein the supplied working power parameters include three-phase voltage and three-phase current, wherein the voltage and current are output in the same phase;

[0021] Step S2, calculate the input power P of each phase 输入 =UIcosφ, where P 输入 is the input power, U is the input three-phase voltage, I is the input three-phase current, is the power factor;

[0022] Step S3, using the data communication module to connect to the load control terminal, and obtain the branch active power P detected by each phase of the load control terminal 负控终端 ;

[0023] Step S4, based on the branch active power P 负控终端 And the transformer ratio k, get the primary side power data P 负控终端 * ; P 负控终端 * and P 输入 Conduct comparative analysis;

[0024] Step S5, by obtaining the branch active power P 负控终端 * Determine whether the load control terminal is working normally, and at the same time determine abnormal wiring and abnormal branches by comparing the power differences.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The load control terminal operation and maintenance detection device provided by the present invention outputs voltage in the form of a battery-driven digital power amplifier to supply working power to the load control terminal; different from the traditional H-bridge inverter output, the circuit module has high integration and a small device size, and can be driven by a battery to output, effectively promoting the normal power supply of the load control terminal, and the output signal is stable, reliable and efficient;

[0027] (2) The load control terminal operation and maintenance detection device provided by the present invention outputs three-phase voltage and synchronously outputs the same-phase three-phase current. Compared with the traditional signal source device, it does not need to output each phase separately, which reduces the size of the device, improves the portability of the device design, and facilitates efficient on-site operation and maintenance in a non-powered environment;

[0028] (3) The present invention proposes a load control operation and maintenance detection method, which connects the data communication interface to the load control terminal, and can use RS-485 communication to read the active power and reactive power of each branch load of the three-phase lower level of the load control terminal. At the same time, the device calculates the standard power according to the output voltage and current, and compares it with the read data to efficiently and accurately determine the terminal load branch wiring, provide data support for on-site maintenance, assist in safe and efficient completion of operation and maintenance detection, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a structural diagram of a load control terminal operation and maintenance detection device provided by the present invention.

[0031] Figure 2 This is a schematic diagram of converting battery voltage in the DC-DC power conversion unit provided by the present invention.

[0032] Figure 3 This is a schematic diagram of single-phase output in the three-phase voltage and current output module provided by the present invention.

[0033] Figure 4 A flowchart of the steps of a load control terminal operation and maintenance detection method provided by the present invention.

[0034] Figure 5 This is a schematic diagram of the installation of a load control terminal operation and maintenance detection device provided by the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0036] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0037] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0038] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0039] In order to fully understand the present invention, a detailed structure will be proposed in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail as follows, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0040] See also Figure 1 , the first aspect of the present invention discloses a load control terminal operation and maintenance detection device, including a load control terminal, the detection device specifically includes a power supply module, a data communication module, a control processing module, a three-phase voltage and current output module, a measurement module and a display module;

[0041] The power supply module is used to provide working voltage to each module of the detection device;

[0042] The data communication module is used to upload the detection data from the load control terminal to the control processing module;

[0043] The control processing module is used to issue communication instructions, obtain data through the data communication module for analysis and processing, or upload data and processing results through the data communication module;

[0044] The three-phase voltage and current output module is used to output three-phase voltage and three-phase current;

[0045] The measuring module is used to measure the values ​​of the output three-phase voltage and three-phase current;

[0046] The display module is used to display the detection data and calculation analysis results in real time.

[0047] Exemplarily, the present invention provides a load-controlled terminal operation and maintenance detection device, wherein the control processing module is connected to the data communication module, and acquires data through the data communication module for analysis and processing or uploads data and processing results through the communication unit; the control processing module is connected to the display module, and displays the detection data and calculation and analysis results in real time; the control processing module is connected to the three-phase voltage and current output module, and controls the start of the output of the three-phase voltage and three-phase current; the control processing module is connected to the measurement module, and monitors and records the values ​​of the output three-phase voltage and three-phase current; the control processing module is connected to the power supply module, and monitors the battery power in real time.

[0048] Specifically, the power supply module includes a charging control unit and a DC-DC power conversion unit; the battery power supply unit is used to provide an electric energy storage carrier and is connected to the charging control unit. The charging control unit charges the battery power supply unit when the battery power is insufficient. The battery power supply unit is connected to the DC-DC power conversion unit to convert the output of the electric energy storage carrier to provide working voltage to each module of the device.

[0049] Exemplarily, the battery power supply unit has a built-in 12V lithium battery, which is connected to the charging control unit for charging via a charging interface of a charger with an indicator light, thereby ensuring continuous and reliable mobile operation of the device.

[0050] For details, see Figure 2 The DC-DC power conversion unit has four output terminals, namely VDC1, VDC2, VDC3 and VDC4. The VDC1 terminal is used to power the control processing module and the display module. The VDC2 terminal is connected to the isolation power supply unit, and the isolated power supply is used to power the data communication module. The VDC3 terminal is connected to the reference power supply unit to provide a reference voltage Vref. The VDC4 terminal is connected to the three-phase voltage and current output module to provide a driving voltage.

[0051] Specifically, the data communication module includes a Bluetooth communication unit and an RS-485 communication unit. The Bluetooth communication unit is connected to the handheld terminal to upload the detection data to the handheld terminal. The RS-485 communication unit is connected to the load control terminal to obtain the detection data of the load control terminal. The detection data includes three-phase power data, and the three-phase power data includes voltage, current, power factor, and active power.

[0052] Exemplarily, the detection device is connected to a handheld terminal via a built-in Bluetooth communication unit and the detection data is uploaded to the handheld terminal. The handheld terminal displays the detection results in various forms such as tables, phasor diagrams, wiring diagrams, etc., and the detection data can be viewed in real time, and the detection results can be saved and exported in a timely manner, so as to facilitate the archiving of detection records.

[0053] Specifically, the three-phase voltage and current output module includes a voltage output unit and a current output unit for each phase:

[0054] Wherein, the voltage output unit includes a PWM modulation unit, a switch amplification unit, and a filter unit; the PWM modulation unit is used to modulate the input DC voltage VDC4 to output a pulse signal whose pulse width is proportional to the DC voltage VDC4, and then the input pulse signal is amplified by the switch amplification unit, and the high-frequency signal is filtered out by the filter unit to obtain the output voltage and connect the L and N terminals of each phase output interface;

[0055] The current output unit includes a voltage transformer and a sampling resistor. The output voltage is converted by the voltage transformer and then passes through the sampling resistor to obtain the output current, which is connected to the loop interface of each phase current output.

[0056] For example, see Figure 3 In the three-phase voltage and current output module, the voltage output unit and current output unit of each phase A, B, and C are independent of each other. At the same time, the output voltage phase of phase A is used as the reference, the voltage phase of phase B is 120°, and the voltage of phase C is 240°, which satisfies the three-phase balanced output; the current and voltage are output in phase. The control processing module can output a square wave signal with a duty cycle of 50%, which is input into the PWM modulation unit of the voltage output unit, and the DC voltage VDC4 converted by the battery is input at the same time. After PWM modulation, a pulse signal with a pulse width proportional to the DC voltage VDC4 is output. The input signal is amplified by the switch amplifier unit, and then the high-frequency signal is filtered out by the filter unit, and the output voltage Vout+ and Vout- are output. Vout+ is connected to the L end of the output voltage, and the output voltage Vout- is connected to the N end of the output voltage; the output voltage is an AC voltage of 220V;

[0057] At the same time, the output voltage Vout+ and the output voltage Vout- are connected to the input end of the voltage transformer TV. If the transformation ratio of TV is 200:1, the 220V voltage is converted to 1.1V, and the sampling resistor R=0.55Ω is connected to obtain an output current of 2A, and the output current Iout+ and the output current Iout- are connected to the interface of the current output loop; among them, different output current sizes can be controlled according to the size of R.

[0058] Specifically, the display module displays the detection data and results in real time in multiple forms such as numerical statistical tables, phasor diagrams, wiring diagrams, and result description texts.

[0059] Exemplarily, the display module has high resolution, which allows intuitive viewing of test data. It can also store data at any time and export test reports at any time through an installed memory card, or connect to mobile phone software through wireless communication to view test data and archive reports, thereby ensuring the timeliness of on-site testing and report archiving.

[0060] See also Figure 4 The second aspect of the present invention discloses a load control terminal operation and maintenance detection method, which is applied to the aforementioned detection device, and the method comprises the following steps:

[0061] Step S1, connecting the detection device to supply working power parameters to the load control terminal, wherein the supplied working power parameters include three-phase voltage and three-phase current, wherein the voltage and current are output in the same phase;

[0062] Step S2, calculate the input power P of each phase 输入 =UIcosφ, where P 输入 is the input power, U is the input three-phase voltage, I is the input three-phase current, is the power factor;

[0063] Step S3, using the data communication module to connect to the load control terminal, and obtain the branch active power P detected by each phase of the load control terminal 负控终端 ;

[0064] Step S4, based on the branch active power P 负控终端 And the transformer ratio k, get the primary side power data P 负控终端 * ; P 负控终端 * and P 输入 Conduct comparative analysis;

[0065] Step S5, by obtaining the branch active power P 负控终端 * Determine whether the load control terminal is working normally, and at the same time determine abnormal wiring and abnormal branches by comparing the power differences.

[0066] For example, when the three-phase voltage is output at the same time, the three-phase current is output synchronously. According to the actual needs on site, 220V AC voltage and 2A current can be output. When the transformation ratio of the transformer is 800:5, 12.5mA secondary current can be supplied to the circuit, providing a basis for detection data.

[0067] See also Figure 5When overloaded, relays K0, K1, K2, and K3 may trip. During on-site operation and maintenance testing, the load control terminal operation and maintenance detection device is installed in the primary circuit. By injecting three-phase voltage U and three-phase current I into the primary circuit of the transformer T, the load control terminal is provided with working power and simulated load current. The load control terminal can obtain the operating data of branch 1 meter, branch 2 meter, and branch 3 meter. The detection device is connected to the load control terminal, and the operating power parameters of each phase monitored by the load control terminal are obtained synchronously. If P can be obtained 负控终端 data, the load control terminal works normally, otherwise the voltage circuit connected to the load control terminal has a phase failure, and the load control terminal cannot work normally; 负控终端 * and P 输入 After comparison, if there is a branch with inconsistent data, it is determined to be an abnormally connected phase. The voltage and current of the abnormally connected phase are checked simultaneously to locate the branch as abnormal voltage connection or abnormal current connection.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A load control terminal operation and maintenance detection device, characterized in that: The detection device specifically includes a power supply module, a data communication module, a control processing module, a three-phase voltage and current output module, a measurement module and a display module; The power supply module is used to provide working voltage to each module of the detection device; the power supply module includes a battery power supply unit, a charging control unit, and a DC-DC power conversion unit; the battery power supply unit is used to provide an electric energy storage carrier and is connected to the charging control unit, and the battery power supply unit is charged by the charging control unit when the battery power is insufficient, and the battery power supply unit is connected to the DC-DC power conversion unit to convert the output of the electric energy storage carrier to provide working voltage to each module of the device; The DC-DC power conversion unit has four output terminals, namely, VDC1, VDC2, VDC3, and VDC4. The VDC1 terminal is used to supply power to the control processing module and the display module. The VDC2 terminal is connected to the isolation power supply unit, and the isolated power supply supplies power to the data communication module. The VDC3 terminal is connected to the reference power supply unit to provide a reference voltage Vref. The VDC4 terminal is connected to the three-phase voltage and current output module to provide a driving voltage. The data communication module is used to upload the detection data from the load control terminal to the control processing module; the data communication module includes a Bluetooth communication unit and an RS-485 communication unit, the Bluetooth communication unit is connected to the handheld terminal to upload the detection data to the handheld terminal, and the RS-485 communication unit is connected to the load control terminal to obtain the detection data of the load control terminal, the detection data includes three-phase power data, and the three-phase power data includes voltage, current, power factor, and active power; The control processing module is used to issue communication instructions, obtain data through the data communication module for analysis and processing, or upload data and processing results through the data communication module; The three-phase voltage and current output module is used to output three-phase voltage and three-phase current; the three-phase voltage and current output module includes a voltage output unit and a current output unit for each phase: wherein the voltage output unit includes a PWM modulation unit, a switch amplification unit, and a filter unit; the PWM modulation unit is used to modulate the input DC voltage VDC4, output a pulse signal whose pulse width is proportional to the DC voltage VDC4, and then amplify the input pulse signal through the switch amplification unit, and filter the high-frequency signal through the filter unit to obtain the output voltage and connect the L and N terminals of each phase output interface for output; The current output unit includes a voltage transformer and a sampling resistor. The output voltage is converted by the voltage transformer and then passes through the sampling resistor to obtain an output current, which is connected to the loop interface of each phase current output. The measuring module is used to measure the values ​​of the output three-phase voltage and three-phase current; The display module is used to display the detection data and calculation analysis results in real time.

2. A load control terminal operation and maintenance detection device according to claim 1, characterized in that: The display module displays the detection data and results in real time in multiple forms such as numerical statistical tables, phasor diagrams, wiring diagrams, and result description texts.

3. A method for detecting operation and maintenance of a load control terminal, wherein the method is applied to the detection device according to any one of claims 1 to 2, characterized in that: The method comprises the following steps: Step S1, connecting the detection device to supply working power parameters to the load control terminal, wherein the supplied working power parameters include three-phase voltage and three-phase current, wherein the voltage and current are output in the same phase; Step S2, calculate the input power P of each phase 输入 =UIcosφ, where P 输入 is the input power, U is the input three-phase voltage, I is the input three-phase current, is the power factor; Step S3, using the data communication module to connect to the load control terminal, and obtain the branch active power P detected by each phase of the load control terminal 负控终端 ; Step S4, based on the branch active power P 负控终端 And the transformer ratio k, get the primary side power data P 负控终端 * ; P 负控终端 * and P 输入 Conduct comparative analysis; Step S5, by obtaining the branch active power P 负控终端 * Determine whether the load control terminal is working normally, and at the same time determine abnormal wiring and abnormal branches by comparing the power differences.

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