CN209460326U - Line loss acquisition device and system - Google Patents

Abstract

The disclosure proposes a line loss acquisition device and system, wherein the line loss acquisition device includes a voltage acquisition module and a current acquisition module, and the voltage acquisition module and the current acquisition module respectively transmit the voltage and current of the line to be acquired through the data transmission module To the control module, the control module is also respectively connected with the operation indication module and the built-in hardware clock circuit with temperature compensation function; the control module is configured to perform the judgment of the line system by collecting the voltage, and the electric energy metering and measurement , clock clearing, data storage and freezing, and event logging. The technical solution disclosed in this disclosure can measure up to two voltage channels and eight current channels, and can flexibly realize free combination to measure the voltage, current frequency, power factor, active and reactive energy and other parameter values of each circuit through configuration, and realize power distribution in combination with DTU Collection of line loss.

Description

Line loss acquisition device and system

technical field

The present disclosure relates to the technical field of line power collection, and in particular to a line loss collection device and system.

Background technique

There will be losses when the current passes through the wires, and there are a large number of transformers, switches, instruments and other equipment in the power transmission network, which will also consume a certain amount of energy. Generally, the energy loss during the power supply process of the power system is called line loss .

The line loss acquisition device is used to collect the line loss electricity during the transmission process of each level of power grid in the transmission and distribution network. The existing problems are:

The distribution line loss acquisition device has a simple structure, large equipment volume, low detection accuracy and low work efficiency, which seriously affect the detection results.

Utility model content

In order to solve the deficiencies of the prior art, the implementation example of the present disclosure provides a line loss acquisition device, which has the advantages of small size, high precision, high reliability, easy installation, etc., and the active precision of the product meets the requirements of various regulations.

In order to achieve the above object, the application adopts the following technical solutions:

The line loss acquisition device includes a voltage acquisition module and a current acquisition module, the voltage acquisition module and the current acquisition module respectively transmit the voltage and current of the line to be acquired to the control module through the data transmission module, and the control module is also connected with the operation instruction The module is connected with the built-in hardware clock circuit with temperature compensation function;

The control module is configured to judge the wiring system of the line by collecting voltage, as well as electric energy metering and measurement, clock clearing, data storage and freezing, and event recording.

As a further technical solution of the present application, the line system of the line is judged by collecting the voltage, specifically:

The default wiring system is three-phase four-wire system. After normal sampling, if the voltage of phase B is 0, and the voltage of at least one phase of phase A and phase C is greater than 72.3V, it is judged as three-phase three-wire.

As a further technical solution of the present application, when the line system is judged, the voltage is collected every set time and the line system is re-judged to adapt to the switching of voltage conditions during operation.

As a further technical solution of the present application, the data transmission module is a communication interface, including but not limited to RS232 interface, RS485 interface; the communication rate can be 19200bps, 9600bps, 4800bps, 2400bps or 1200bps.

As a further technical solution of the present application, the current collection module collects current signals from several lines respectively, wherein two lines form a group.

As a further technical solution of the present application, the voltage acquisition module uses voltage transformers, and the number of voltage transformers is two.

As a further technical solution of the present application, the operation indication module is an operation indicator light, and there are two rows of operation indicator lights, the upper row of indicator lights is used for power supply indication, and the lower row of indicator lights is used for operation indication.

As a further technical solution of the present application, an environment-friendly lithium battery is used as a backup power supply for the clock circuit, and the clock can be calibrated through the RS232 interface.

As a further technical solution of the present application, the line loss acquisition device also includes a housing, and a voltage acquisition module, a current acquisition module, a data transmission module, and a control module are arranged in the housing; the panel of the housing is provided with The interface of the voltage acquisition module, the interface of the current acquisition module, the interface of the data transmission module and the operation indicator light.

As a further technical solution of the present application, the voltage acquisition module generates a voltage signal through voltage parallel negative feedback, which is transmitted to the operational amplifier unit of the control module for processing, and the signal processed by the operational amplifier unit is transmitted to the metering chip of the control module , the maximum input signal required by the metering chip is a millivolt signal.

As a further technical solution of the present application, the control module implements event recording. After the collected voltage or current signal is transmitted to the control module, the control module judges according to the judgment conditions, records after the judgment, and backs up the event Stored in the memory, when it needs to be viewed, it is read through the protocol.

The implementation example of the present disclosure also discloses a line loss acquisition system, including a power distribution switch monitoring terminal and any one of the above-mentioned line loss acquisition devices, and the power distribution switch monitoring terminal and the line loss acquisition device communicate with each other to realize data exchange;

Using the power distribution switch monitoring terminal to select the 3-way DC24V passive remote signal input function, the self-adaptive combined measurement of the dual-way voltage and 8-way current is realized by collecting the PT switch state and the bus connection.

The implementation example of the present disclosure also discloses the working method of the line loss acquisition system, including the step of voltage self-adaptation, specifically:

After the line loss acquisition device is normally powered on, use the voltage acquisition module to perform voltage acquisition on the voltage sampling line;

Judge the voltage conditions of three-phase four-wire system and three-phase three-wire system. The judgment conditions are: the default is three-phase four-wire system, and judge after normal sampling: if the voltage of phase B is 0, and there is at least one voltage between phase A and phase C If the phase voltage is greater than 72.3V, it is judged as a three-phase three-wire system;

After normal operation, the three voltage working conditions will be judged every setting to adapt to the switching of voltage working conditions during operation.

When the line loss acquisition device is powered on, the voltage acquisition is performed, and the auxiliary power supply and the sampling circuit are powered on at the same time or the sampling circuit is powered on first.

As a further technical solution of the present application, the working method of the line loss acquisition system also includes:

Clearing operation, clearing the electric energy, freezing amount, and event record data stored in the distribution line loss acquisition device;

In electric energy metering, after power-on, it is necessary to set the location of the acquisition module loop interval and the relationship between voltage and current combination, and perform forward and reverse active electric energy, four-quadrant reactive electric energy measurement and phase-separated active electric energy measurement;

When measuring electric energy, the measured operating parameters include total and individual phase active power, reactive power, power factor, phase voltage, phase current and frequency;

When data is stored and frozen, the collected data can be frozen and the frozen data can be saved by adopting timing freezing, instantaneous freezing, daily freezing, monthly freezing, tidal current direction changing freezing or hourly freezing;

During event recording, the event records will be judged by a judgment condition, and then recorded, and the recorded event backup is stored in the memory, which needs to be checked and read through the protocol.

As a further technical solution of this application, when data is stored and frozen, the frozen content and identifiers should meet the requirements of DL/T 634.5101 total power and its filing documents.

Compared with the prior art, the beneficial effects of the present disclosure are:

The technical solution disclosed in this disclosure can measure up to two voltage channels and eight current channels, and can flexibly realize free combination to measure the voltage, current frequency, power factor, active and reactive energy and other parameter values of each circuit through configuration, and realize power distribution in combination with DTU Collection of line loss.

The technical scheme of the present disclosure has eight loops of active and reactive pulse lights, power supply and operation indication can enter the clock and other parameter settings, and has the function of electric energy pulse output, and can use RS232/RS485 level communication interface to realize data exchange with FTU, very It greatly facilitates the management of power distribution loss.

Optional 3-way DC24V passive remote signal input function, through the acquisition of passive remote signal input function, through the acquisition of PT switch status and bus connection to realize the self-adaptive combined measurement of dual-channel voltage and 8-channel current.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.

FIG. 1 is a schematic structural diagram of one or more implementation examples of the present application;

Fig. 2 is the two-way three-phase voltage schematic diagram of one or more implementation examples of the present application;

FIG. 3 is a schematic diagram of an operational amplifier of one or more implementation examples of the present application;

Fig. 4 (a) is the schematic diagram of the eight-way three-phase current loop of one or more implementation examples of the present application;

Fig. 4 (b) is the metering chip circuit principle diagram of the present application;

Fig. 5 is a schematic diagram of event recording of one or more implementation examples of the present application;

In the figure, 1 - the first line interface; 2 - the second line interface; 3 - the third line interface; 4 - the fourth line interface; 5 - the fifth line interface; 6 - the sixth line interface; 7 - the seventh line Interface; 8 - eighth line interface; 9 - indicator light; 10 - PT1 interface of voltage transformer; 11 - PT2 interface of voltage transformer, 12, verification port.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

In a typical implementation of the present application, a line loss acquisition device is disclosed, including: an acquisition module housing; the acquisition module housing is provided with a voltage and current acquisition module, an operation indication module and a data transmission module, and the voltage and current acquisition The module is equipped with a current acquisition device and a voltage acquisition device.

The circuits related to current acquisition are shown in Figure 4(a)-Figure 4(b). The current acquisition devices are divided into four groups. The first group collects current signals for the first line and the second line, and the second group is for the third The line and the fourth line are used for collecting current signals, the third group is used for collecting current signals for the fifth line and the sixth line, and the fourth group is used for collecting current signals for the seventh line and the eighth line.

In terms of specific structure, as shown in Figure 1, the panel of the acquisition module housing is provided with a first line interface 1; a second line interface 2; a third line interface 3; a fourth line interface 4; a fifth line interface 5; Sixth line interface 6; seventh line interface 7; eighth line interface 8; indicator light 9; voltage transformer PT1 interface 10; voltage transformer PT2 interface 11, verification port 12. The verification port is used to realize the verification work of the device, including 8 sockets, which can separately verify the power supply, operating status, reactive power status and active power status.

In a specific implementation example, the voltage acquisition device is a voltage transformer PT1 and a voltage transformer PT2, and judges for the voltage conditions of 3*57/100V (three-phase four-wire), 3*100V (three-phase three-wire).

In the specific implementation example, the voltage judgment condition of 3*57/100V (three-phase four-wire), 3*100V (three-phase three-wire), the default is 3*57/100V (three-phase four-wire), after normal sampling Judgment: The voltage of phase B is 0, and the voltage of at least one phase of phase A and phase C is greater than 72.3V, then it is judged as 3*100V (three-phase three-wire).

Through the above method, when the voltage specification is not confirmed, the voltage type of the site can be obtained by first sampling to obtain the voltage value. Adaptation to different voltage types can be realized.

In a specific implementation example, the line loss acquisition device judges three voltage working conditions every hour to adapt to the switching of voltage working conditions during operation. The schematic diagram of the two-way three-phase voltage is shown in Figure 2. Using this The circuit realizes the measurement of the voltage and the processing of the voltage signal.

In a specific implementation example, the running indicator module is a running indicator light, and the running indicator lights are in two rows. The upper row is a power indicator, and the lower row is a running indicator. Active indicator light, and eight reactive indicator lights in the lower row.

In a specific implementation example, the data transmission module is a communication interface: RS232, RS485; communication rate (bps): 19200, 9600 (default), 4800, 2400, 1200 are optional.

The line loss acquisition device of the present application is equipped with functional components for realizing electric energy metering and measurement, clock, and distribution line loss acquisition module clearing, data storage and freezing, and event recording.

Among them, the clock should adopt the built-in hardware clock circuit with temperature compensation function, and the output frequency of the internal clock terminal is 1Hz.

The voltage sampling of the voltage acquisition device passes through the voltage transformer PT1 and the voltage transformer PT2, and through the voltage parallel negative feedback, a voltage signal is generated. The signal amplitude is large and the anti-interference is strong. It enters the second stage of the CPU board. The maximum input signal required is a millivolt signal, and the amplitude of the signal needs to be reduced to enter the metering chip.

The schematic diagram of the operational amplifier is shown in Figure 3, and the operational amplifier circuit is used to realize the operational amplifier processing of the signal.

The line loss acquisition device of this application can realize electric energy metering and measurement:

a) It has the functions of measuring and recording forward and reverse active electric energy and four-quadrant reactive electric energy. b) It has the function of measuring phase-separated active electric energy; the total electric energy should not be calculated by arithmetic addition of each phase-separated electric energy. c) It has the function of measuring the total and individual phase active power, reactive power, power factor, phase voltage, phase current, frequency and other operating parameters. d) After the equipment is powered on, it is necessary to design the position of the circuit interval (combination relationship between voltage and current) through software in order to measure correctly.

Clock timing: a) A built-in hardware clock circuit with temperature compensation function should be used, and the output frequency of the internal clock terminal is 1Hz. b) The clock should have the functions of calendar, timing, and leap year automatic conversion. c) An environmentally friendly lithium battery should be used as the clock backup power supply; the clock backup power supply does not need to be replaced within the life cycle of the distribution line loss acquisition module, and the internal clock should be maintained for a cumulative working time of not less than 5 years after power failure; the battery voltage is insufficient , the distribution line loss acquisition module should give an alarm prompt. d) The time of the distribution line loss acquisition module can be calibrated through the RS232 interface. During normal operation, the clock’s operating voltage is provided by an external 220V power supply. When the external power supply is cut off, the clock’s battery provides the power supply voltage. Generally speaking, it can work for 5 years. When the battery voltage is insufficient, the distribution line loss acquisition module should give an alarm prompt, which can be realized by reading the message data.

Clearing the distribution power loss acquisition module: a) clearing the data stored in the distribution power loss acquisition module, such as electric energy, freezing amount, and event records. b) The zeroing operation should be recorded permanently as an event, and there should be safety measures to prevent unauthorized operations. c) The meter bottom value of the distribution line loss acquisition module can only be cleared, and setting is prohibited.

Data storage and freezing: a) Timing freezing: freezing electric energy data according to the agreed time and time interval; each freezing amount should be saved at least 96 times. b) Instantaneous freezing: Under abnormal conditions, freeze the current calendar, time, all electric energy and important measurement data; the amount of instant freezing should save the last 3 data. c) Daily freezing: store the electric energy at zero o'clock every day, and it should be able to store 62 days of data. When the power failure time misses the daily freezing time, the daily freezing data will be supplemented when the power is turned on, and the freezing data of the last 7 days can be supplemented at most. d) Monthly Freezing: Stores monthly electrical energy. 24 data can be stored. e) Freeze when the direction of the tidal current changes: When the direction of the tidal current changes, all current electric energy data should be frozen, and 24 data can be stored. f) Freeze on the hour: store the active total electric energy at the hour or the half hour, and it should be able to store 254 data. g) The frozen content and identifiers shall comply with the requirements of DL/T634.5101 total electrical energy and its filing documents.

About event records: As shown in Figure 5, all event records will be judged by a judgment condition, and then recorded. Such as voltage loss, current loss, overvoltage, and overcurrent. Among them, the record of the number of voltage loss times, after the voltage signal enters the CPU, enters the judgment condition for judgment. E2PROM. It needs to be viewed and read through the protocol.

a) The total number of voltage loss of each phase, the latest 10 voltage loss occurrence time, end time and corresponding electric energy data and other information shall be recorded; the voltage loss function shall meet the technical requirements of DL/T 566. b) The total number of phase failures of each phase, the time when the last 10 phase failures occurred, the end time and the corresponding electric energy data and other information should be recorded. c) The total number of current loss in each phase, the time when the last 10 current loss occurred, the end time and the corresponding electric energy data and other information should be recorded. d) The latest 10 times of total voltage loss occurrence time, end time, and corresponding current value should be recorded; after the total voltage loss, the program should not be disordered, all data should not be lost, and the storage time should not be less than 180 days; after the voltage is restored , the distribution line loss acquisition module should work normally. e) The distribution line loss acquisition module should record the total number of voltage (current) reverse phase sequences, the latest 10 occurrence times, end times and their corresponding electric energy data. f) The total number of power flow reversals, the time when the last 10 power flow reversals occurred, the end time, and the corresponding electric energy data should be recorded. g) It can record the total number of power failures, as well as the time when the last 10 power failures occurred and ended. h) It can record the latest 10 times of voltage (current) unbalance occurrence, end time and corresponding electric energy data. i) It can record the total number of power supply abnormal events, the latest 10 occurrence time, end time and corresponding power energy data. j) It can record the total number of time adjustments (excluding broadcast time adjustment), as well as the time and operator code of the last 10 time adjustments. k) It can record the total number of overloads of each phase, the total time, and the duration of the last 10 overloads. l) Permanently record the occurrence time of the reset event of the distribution line loss acquisition module and the electric energy data at the time of reset. m) According to the number of zero incidents in DL/T634.5101 and the requirements of filing documents, realize the reporting function of incidents by means of additional information. The content of the reported event can be set. n) The total occurrence times and (or) total cumulative time of each event can be recorded.

The module disclosed in this disclosure has the advantages of small size, high precision, good reliability, easy installation, etc. The active precision of the product meets the 0.5S level requirements in GB/T GB/T GB/T GB/T 17215.322-2008, and the reactive power meets GB/T 17215.323 GB/T17215 .323 GB/T 17215.323-2008 Level 2 requirements, and meet the requirements of the grid primary and secondary integration specifications.

The implementation example of the present disclosure also discloses a line loss acquisition system, including a monitoring terminal of a power distribution switch and a line loss acquisition device that communicate with each other to realize data exchange;

Using the power distribution switch monitoring terminal to select the 3-way DC24V passive remote signal input function, the self-adaptive combined measurement of the dual-way voltage and 8-way current is realized by collecting the PT switch state and the bus connection.

The line loss acquisition device of the present disclosure can realize the voltage self-adaptive function, firstly, when the device is powered on normally, the voltage can be measured correctly. After the auxiliary power supply of the line loss module is powered on, it will collect the voltage of the voltage sampling line, and judge the voltage conditions of 3*57/100V (three-phase four-wire) and 3*100V (three-phase three-wire). Judgment conditions are: the default is 3*57/100V (three-phase four-wire), judge after normal sampling: the voltage of phase B is 0, and the voltage of at least one phase of phase A and phase C is greater than 72.3V, then the judgment is 3* 100V (three-phase three-wire). And in order to judge whether there is a misjudgment of connection during power-on, after normal operation, the judgment of the three voltage working conditions will be carried out every hour to adapt to the switching of voltage working conditions during operation. It is best to power on the auxiliary power supply and the sampling circuit at the same time or power on the sampling circuit first, otherwise it is possible to make a wrong judgment on the voltage within one hour after power on, which will affect the energy metering one hour after power on, that is, the line loss statistics .

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (9)

1. line loss acquisition device, characterized in that including voltage acquisition module and current acquisition module, the voltage acquisition module and The voltage and current of route to be collected is transmitted to control module, the control by data transmission module respectively by current acquisition module Molding block is also connected with operation indicating module and hardware clock circuit with temperature compensation function respectively；

The control module is configured as executing to be judged and electrical energy measurement and survey by line system of the collection voltages to route Amount, clock are reset, data store and are freezed and logout.

2. line loss acquisition device as described in claim 1, characterized in that the data transmission module is communication interface, including But it is not limited to RS232 interface, RS485 interface；Traffic rate be chosen as 19200bps, 9600bps, 4800bps, 2400bps or 1200bps。

3. line loss acquisition device as described in claim 1, characterized in that if the current acquisition module respectively pair main line into The acquisition of row current signal, wherein route is one group two-by-two.

4. line loss acquisition device as described in claim 1, characterized in that the voltage acquisition module uses voltage transformer, The quantity of voltage transformer is two.

5. line loss acquisition device as described in claim 1, characterized in that the operation indicating module is run indicator, fortune Row indicator light is two rows, and upper row's indicator light is used for power supply instruction, and lower row's indicator light is for running instruction.

6. line loss acquisition device as described in claim 1, characterized in that use the lithium battery of environment-friendly type standby as clock circuit With power supply, clock can be calibrated by RS232 interface.

7. line loss acquisition device as described in claim 1, characterized in that the line loss acquisition device further includes shell, described Voltage acquisition module, current acquisition module, data transmission module and control module are provided in shell；On the panel of the shell It is provided with the interface of voltage acquisition module, the interface of current acquisition module, the interface of data transmission module and run indicator.

8. line loss acquisition device as described in claim 1, characterized in that the voltage acquisition module is negative anti-by voltage parallel Feedback generates voltage signal, and the amplifier unit for being transmitted to control module handled, signal transmission that amplifier unit carries out that treated To the metering chip of control module, the maximum input signal that metering chip requires is millivolt signal.

9. line loss acquisition system, characterized in that including panel switches monitor terminal and use any line loss of claim 1-8 Acquisition device, panel switches monitor terminal and line loss acquisition device are in communication with each other, and realize data exchange.