CN110554260A - double-circuit voltage switching line loss measuring system and control method and device - Google Patents
double-circuit voltage switching line loss measuring system and control method and device Download PDFInfo
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- CN110554260A CN110554260A CN201910744000.5A CN201910744000A CN110554260A CN 110554260 A CN110554260 A CN 110554260A CN 201910744000 A CN201910744000 A CN 201910744000A CN 110554260 A CN110554260 A CN 110554260A
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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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Abstract
The application relates to the field of line measurement, in particular to a double-circuit voltage switching line loss measurement system, a control method and a control device. A two-way voltage switching line loss measurement system, comprising: a current sampling module; a first voltage sampling module; a second voltage sampling module; the voltage switching module is respectively connected with the first voltage sampling module and the second voltage sampling module; the measurement module is connected with the current sampling module and the voltage switching module and outputs a measurement result pulse; and a management module. According to the double-circuit voltage switching line loss measuring system and the control method and device, double voltage detection is adopted in the system, the analog switch is used for controlling the output selection of voltage signals, and the voltage and current combined measurement scheme is configured, so that the line loss measuring requirement of the distribution network automation terminal in different occasions can be met, the debugging and installation of complete equipment are facilitated, and the cost is saved.
Description
Technical Field
the application relates to the field of line measurement, in particular to a double-circuit voltage switching line loss measurement system, a control method and a control device.
Background
The existing line loss measuring device adopts a full SOC measuring scheme or a mode of adding a measuring chip to an MCU (microprogrammed control unit), voltage and current sampling is accessed through an external wiring terminal, measurement is realized through an electromagnetic mutual inductor, a measuring pulse supports two output modes of an optical pulse and an electric pulse, 2-path voltage and 8-path current are combined and measured in a hardware fixing mode, namely, a first voltage corresponds to 1-4 loop current, a second voltage corresponds to 5-8 loop current, and the line loss measuring device cannot be set after leaving a factory or the accuracy after setting is influenced; the current wiring terminal adopts a fixed mode of welding on the printed board, once the current terminal is damaged, the current wiring terminal needs to be returned to a factory for welding and maintenance, and due to the fact that the area of the welding position of the current terminal and the printed board is not enough, the risk of burning out exists in the short-circuit current and fault current.
patent application No. 201821065781.2 discloses a line loss acquisition module with an analog switch, but the module can only be used as a general switch and has a single function, and a plurality of same devices are required to work together, and double-path switching and detection of line loss by matching the whole device cannot be realized.
therefore, the technical field still has defects, and the research, development and creation of the inventor are urgently needed.
Disclosure of Invention
in view of the defects of the prior art, the present application aims to provide a two-way voltage switching line loss measurement system, a control method and a device, which can realize the line loss measurement by matching two-way voltage with multiple current signals.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a two-way voltage switching line loss measurement system, comprising:
The current sampling module is used for detecting an external current signal;
The first voltage sampling module is used for detecting and outputting a first voltage signal;
The second voltage sampling module is used for detecting and outputting a second voltage signal;
The voltage switching module is respectively connected with the first voltage sampling module and the second voltage sampling module and is used for selecting one of the two voltage signals;
The measurement module is connected with the current sampling module and the voltage switching module and outputs a measurement result pulse;
And the management module is used for receiving the measurement signal of the measurement module, storing and outputting the measurement signal to external equipment and driving the voltage switching module.
preferably, the two-way voltage switching line loss measurement system includes:
The plurality of analog chips are respectively connected with the management module;
the management module is provided with a setting unit, and the setting unit is used for setting the working mode of the voltage switching module.
Preferably, the two-way voltage switching line loss measurement system further includes:
The first signal conditioning module is connected with the first voltage sampling module, and the second signal conditioning module is connected with the second voltage sampling module;
The first signal conditioning module is respectively connected with a plurality of analog chips of the voltage switching module;
the second signal conditioning module is respectively connected with a plurality of analog chips of the voltage switching module;
The working modes comprise: single pressure mode, dual pressure mode.
preferably, in the two-way voltage switching line loss measurement system, the measurement module includes a plurality of measurement chips, and the measurement chips are respectively connected to the plurality of analog chips;
the current sampling module comprises a plurality of current sampling units which are respectively connected with the plurality of measuring chips.
preferably, the two-way voltage switching line loss measurement system further includes:
Serial port communication module, with management module connects, for communication interface, includes:
an RS232 communication interface and an RS485 communication interface; baud rates of communication include: 38400bps, 19200bps, 9600bps, 4800bps, 2400bps, or 1200 bps.
preferably, the two-way voltage switching line loss measurement system further comprises a detection module, which is respectively connected with the management module, the first voltage sampling module and the second voltage sampling module.
A control method for the system, comprising the steps of:
s10, the current sampling module detects a current signal and transmits the current signal to the measuring module; the first voltage sampling module detects the first voltage signal, and the second voltage sampling module detects the second voltage signal and transmits the second voltage signal to the voltage switching module;
S20, the management module controls the working mode of the voltage switching module;
and S30, the measuring module analyzes according to the current signal and the voltage signal output by the voltage switching module, outputs and outputs an analysis result pulse to the management module, and the management module outputs the analysis result to an external device.
in the preferred control method, in step S20, the management module drives the voltage switching module according to a mode signal of the setting unit;
The mode signal of the setting unit is manually input.
in the preferred control method, in step S20, the management module drives the voltage switching module according to a mode signal of the setting unit;
The mode signal of the setting unit is obtained according to the detection signal of the detection module.
A line loss measuring apparatus using the line loss measuring system as claimed in claims 1 to 6.
compared with the prior art, the double-circuit voltage switching line loss measuring system, the control method and the control device provided by the application have the advantages that double-voltage detection is adopted, the analog switch is used for controlling the output selection of the voltage signal, and the scheme of voltage and current combined measurement is configured, so that the requirement of line loss measurement of the distribution network automation terminal on different occasions can be met, the debugging and installation of complete equipment are facilitated, and the cost is saved.
Drawings
FIG. 1 is a block diagram of a two-way voltage switching line loss measurement system provided by the present application;
FIG. 2 is a flow chart of a control method of the dual-path voltage switching line loss measurement system provided by the present application;
Fig. 3 is a circuit diagram of a chip of the voltage switching module provided in the present application;
FIG. 4 is a block diagram of a signal conditioning module in embodiment 1 provided in the present application;
FIG. 5 is a circuit diagram of a first signal conditioning module provided herein;
fig. 6 is a block diagram of the structure of embodiment 2 provided in the present application.
Detailed Description
in order to make the purpose, technical solution and effect of the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Example 1
Referring to fig. 1-3 together, the present application provides a two-way voltage switching line loss measurement system, including:
the current sampling module 1 is used for detecting an external current signal;
a first voltage sampling module 21, configured to detect and output a first voltage signal;
a second voltage sampling module 22, configured to detect and output a second voltage signal;
The voltage switching module 3 is respectively connected with the first voltage sampling module 21 and the second voltage sampling module 22, and is configured to select one of the two voltage signals;
the measurement module 4 is connected with the current sampling module 1 and the voltage switching module 3 and outputs a measurement result pulse;
And the management module 5 is used for receiving the measurement signal of the measurement module 4, storing and outputting the measurement signal to an external device and driving the voltage switching module 3.
Specifically, in this embodiment, the current sampling module 1, the first voltage sampling module 21, and the second voltage sampling module 22 are common components in the field; the first voltage sampling module 21 and the second voltage sampling module 22 communicate the detected first voltage signal and the detected second voltage signal to the voltage switching module 3, the management module 5 drives the voltage switching module 3 to select one path of voltage signal to be transmitted to the measurement module 4, meanwhile, the measurement module 4 receives the current signal required by the current sampling module 1, then performs corresponding data calculation, and outputs the calculation result to the management module 5, and the management module 5 transmits the data to an external device for storage or display. The management module 5 includes a management chip, which is of a type FM33a 0610.
Referring to fig. 2, in the present embodiment, the control method of the system includes the following steps:
S10, the current sampling module 1 detects a current signal and transmits the current signal to the measuring module 4; the first voltage sampling module 21 detects the first voltage signal, and the second voltage sampling module 22 detects the second voltage signal transmitted to the voltage switching module 3;
S20, the management module 5 controls the operating mode of the voltage switching module 3;
s30, the measurement module 4 analyzes the current signal and the voltage signal output by the voltage switching module 3, and outputs an analysis result pulse to the management module 5, and the management module 5 outputs the analysis result pulse to an external device.
Preferably, in this embodiment, the voltage switching module 3 includes:
the plurality of analog chips are respectively connected with the management module 5; the model of the analog chip is SEG 4583. Specifically, please refer to fig. 3, which is a circuit diagram of one of the analog chips in the voltage switching module 3, wherein Ua4, Ub4, Uc4, Ux4, Uy4 and Uz4 are input flags of two voltages, specifically Ua4, Ub4 and Uc4 are first voltage signals input by the first voltage sampling module 21, and Ux4, Uy4 and Uz4 are second voltage signals input by the second voltage sampling module 22; the Ua5, Ub5 and Uc5 are output marks of voltage, and particularly interfaces marked by the Ua5, the Ub5 and the Uc5 are connected with the measuring module 4; the number of the analog chips U4_1-U4_ n is preferably 8, namely the analog chips U4_1-U4_ 8; the interface No. 11 indicates the interface 4583_ SW1 corresponding to the management module 5, and a plurality of the emulations are connected to the corresponding interfaces of a plurality of the management module 5, and during the operation, the emulations are respectively controlled to control the emulation chips.
The management module 5 has a setting unit for setting the operating mode of the voltage switching module 3. In general, the mode signal of the setting unit is derived from manual input, and in this case, the corresponding working mode is determined manually according to the number of voltage paths to be detected on site.
as a preferable solution, in this embodiment, the first voltage sampling module 21 is connected to a plurality of analog chips of the voltage switching module 3 respectively;
the second voltage sampling module 22 is connected to a plurality of analog chips of the voltage switching module 3;
The working modes comprise: single pressure mode, dual pressure mode.
Because the measuring device supports 2 voltage channels, a plurality of current loops measure, a plurality of three-phase voltage sampling signals actually enter the measuring module 4, and only 2 voltage channels are actually input from the outside, the situation that the voltage sampling signals entering the measuring module 4 are shared is inevitably caused.
as one path of voltage signal is to be simultaneously and respectively connected to the plurality of paths of analog chips, to avoid instability of the voltage signal caused at this time, please refer to fig. 4 as a preferred scheme, which is a structural diagram of the first signal conditioning module and the second signal conditioning module in this embodiment, and the line loss detection system in this embodiment further includes:
the first signal conditioning module is connected with the first voltage sampling module, and the second signal conditioning module is connected with the second voltage sampling module;
the first signal conditioning module is respectively connected with a plurality of analog chips of the voltage switching module;
the second signal conditioning module is respectively connected with the plurality of analog chips of the voltage switching module.
specifically, the first signal conditioning module and the second signal conditioning module have the same circuit, and as shown in fig. 5, the first signal conditioning module is a circuit diagram of the first signal conditioning module, where Ua3, Ub3, and Uc3 are position indicators of the voltage signal input to the first voltage sampling module, and Ua4, Ub4, and Uc4 are position indicators of the voltage signal output to the analog switch circuit.
The measuring module 4 comprises a plurality of measuring chips which are respectively connected with a plurality of analog chips; the management module 5 is in data communication with the plurality of measurement chips through SPI interfaces respectively; the model of the measuring chip is HT 7038. Preferably, the number of the measurement chips is 8.
The current sampling module 1 comprises a plurality of current sampling units which are respectively connected with the plurality of measuring chips. Specifically, the current sampling module 1 preferably includes 8 current sampling units, each current sampling unit is used for sampling three-phase current, and each phase of external current is accessed through a current terminal of the measuring device and enters a current sampling channel on the measuring chip through a current transformer and a current sampling circuit.
in order to satisfy the tolling communication between the control module and the external device, the system in this embodiment further includes:
serial port communication module, with management module 5 connects, for communication interface, includes:
An RS232 communication interface and an RS485 communication interface; baud rates of communication include: 38400bps, 19200bps, 9600bps, 4800bps, 2400bps, or 1200 bps.
in a specific implementation, the single-voltage mode is one-path voltage connection, that is, the control module controls the analog chips of the voltage switching module 3 to simultaneously connect one of the first voltage signal and the second voltage signal to be input into the measurement module 4; the dual voltage mode is that the control module controls part of the analog chip of the voltage switching module 3 to switch on the first voltage signal, and the other part of the analog chip to switch on the second voltage signal to be input into the measurement module 4; preferably, if the number of the current sampling units, the analog chips, and the measurement chips is 8, the dual voltage mode is that 4 analog chips connect the first voltage signal to be input to the measurement module 4, and 4 analog chips connect the second voltage signal to be input to the measurement module 4. The setting unit receives a mode signal input on site, and directly sets the mode signal manually, for example, to be the single-voltage mode, so that the voltage switching module 3 of the system executes the operation function of the single-voltage mode.
For example, for the situation that there are an I-section bus and an II-section bus in the voltage of the distribution network access bus, there are 4 loops, 6 loops and 8 loops in the current loop, and the field installation is relatively dispersed, and the combined measurement mode of the voltage class, the current specification, the wiring mode and the voltage and current cannot be unified, in the preferred scheme of the present application, the number of the analog chips and the number of the measurement chips are 8.
Example 2
referring to fig. 6, as a preferred solution, the present embodiment further includes a detection module 7, which is respectively connected to the management module 5, the first voltage sampling module 21, and the second voltage sampling module 22.
when one or both of the first voltage sampling module 21 and the second voltage sampling module 22 are connected to a voltage, the detection module 7 sends a corresponding detection signal to the management module 5, and the management module can automatically switch a corresponding working mode according to the detection signal. At this time, the detection module 7 is configured to determine whether the first voltage sampling module 21 and the second voltage sampling module 22 have voltage access, and when only one voltage access exists, the detection module sends a detection signal with a single voltage input to the management module 5, controls the setting unit to send a single-voltage mode signal to the voltage switching module 3, and controls all the analog chips in the voltage switching module 3 to connect to a path of the voltage sampling module with voltage access; when two paths of voltages are connected, the setting unit is controlled to send a double-voltage mode signal to the voltage switching module 3, half of the analog chips in the voltage switching module 3 are controlled to transmit the first voltage signal to the measuring module 4, and the other half of the analog chips input the second voltage signal to the measuring module 4.
Example 3
The invention also provides a line loss measuring device, and an operation system and a method thereof are the line loss detection system and the control method in the embodiment 1 or 2.
the self-adaptive measurement of three-phase four-wire and three-phase three-wire can be realized, whether the B-phase voltage is less than 60% Un (Un can be 57.7V, 100V and 220V) is judged through the management module 5, wherein Un is a voltage specification, the phase angle of the A phase is 50-70 degrees or the phase angle of the C phase is 290-310 degrees, meanwhile, the judgment is carried out once every second, and if the connection mode is kept for 5 continuous seconds, the measurement is carried out according to the confirmed connection mode.
It should be understood that the technical solutions and the application concepts according to the present application can be equally replaced or changed by those skilled in the art, and all the changes or substitutions should belong to the protection scope of the claims attached to the present application.
Claims (10)
1. a two-way voltage switching line loss measurement system, comprising:
The current sampling module is used for detecting an external current signal;
the first voltage sampling module is used for detecting and outputting a first voltage signal;
The second voltage sampling module is used for detecting and outputting a second voltage signal;
The voltage switching module is respectively connected with the first voltage sampling module and the second voltage sampling module and is used for selecting one of the two voltage signals;
the measurement module is connected with the current sampling module and the voltage switching module and outputs a measurement result pulse;
And the management module is used for receiving the measurement signal of the measurement module, storing and outputting the measurement signal to external equipment and driving the voltage switching module.
2. The dual path voltage switching line loss measurement system of claim 1, wherein the voltage switching module comprises:
the plurality of analog chips are respectively connected with the management module;
The management module is provided with a setting unit, and the setting unit is used for setting the working mode of the voltage switching module.
3. The dual voltage switching line loss measurement system of claim 2, further comprising:
the first signal conditioning module is connected with the first voltage sampling module, and the second signal conditioning module is connected with the second voltage sampling module;
the first signal conditioning module is respectively connected with a plurality of analog chips of the voltage switching module;
the second signal conditioning module is respectively connected with a plurality of analog chips of the voltage switching module;
The working modes comprise: single pressure mode, dual pressure mode.
4. the two-way voltage switching line loss measurement system according to claim 3, wherein the measurement module comprises a plurality of measurement chips, and a plurality of the analog chips are respectively connected;
The current sampling module comprises a plurality of current sampling units which are respectively connected with the plurality of measuring chips.
5. The dual voltage switching line loss measurement system of claim 2, further comprising:
Serial port communication module, with management module connects, for communication interface, includes:
An RS232 communication interface and an RS485 communication interface; baud rates of communication include: 38400bps, 19200bps, 9600bps, 4800bps, 2400bps, or 1200 bps.
6. the dual-path voltage switching line loss measurement system of claim 1, further comprising a detection module respectively connected to the management module, the first voltage sampling module, and the second voltage sampling module.
7. A control method for use in a system according to any of claims 1 to 6, comprising the steps of:
s10, the current sampling module detects a current signal and transmits the current signal to the measuring module; the first voltage sampling module detects the first voltage signal, and the second voltage sampling module detects the second voltage signal and transmits the second voltage signal to the voltage switching module;
S20, the management module controls the working mode of the voltage switching module;
And S30, the measuring module analyzes according to the current signal and the voltage signal output by the voltage switching module, outputs and outputs an analysis result pulse to the management module, and the management module outputs the analysis result to an external device.
8. the control method according to claim 7, wherein in step S20, the management module drives the voltage switching module according to a mode signal of the setting unit;
the mode signal of the setting unit is manually input.
9. the control method according to claim 7, wherein in step S20, the management module drives the voltage switching module according to a mode signal of the setting unit;
the mode signal of the setting unit is obtained according to the detection signal of the detection module.
10. A line loss measuring apparatus using the line loss measuring system according to any one of claims 1 to 6.
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| CN201910744000.5A CN110554260A (en) | 2019-08-13 | 2019-08-13 | double-circuit voltage switching line loss measuring system and control method and device |
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| CN1979187A (en) * | 2005-12-07 | 2007-06-13 | 比亚迪股份有限公司 | Testing device of multi-drive-mode LCD drive circuit and testing method |
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