CN112540250A - Power distribution automation terminal test system based on modular control - Google Patents
Power distribution automation terminal test system based on modular control Download PDFInfo
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Abstract
The invention discloses a power distribution automatic terminal test system based on modular control, which comprises a power distribution terminal detection management module, a power distribution terminal function detection module, a power distribution terminal performance detection module and a power distribution terminal case management module; the power distribution terminal detection management module is used for maintaining and managing detection items, personnel permissions and detection tasks; the power distribution terminal function detection module is used for detecting and managing power supply, communication, data acquisition, data processing, historical data storage, fault detection and fault recording of the power distribution terminal; the distribution terminal performance detection module is used for performing performance detection on alternating current input analog quantity errors, influence quantity of alternating current analog quantity input and power supply change influence of the distribution terminal; the power distribution terminal case management module is used for detecting maintenance and distribution of item information, and realizing new creation and deletion of detection items and updating and upgrading of original item parameters.
Description
Technical Field
The invention relates to the technical field of power distribution automation terminal testing, in particular to a power distribution automation terminal testing system based on modular control.
Background
With the continuous development of social economy and the increasing improvement of the living standard of people, the requirements of power enterprise users on the quality of electric energy and the reliability of power supply are higher and higher. Distribution automation is as the key component of smart power grids, and is extremely important to power enterprises' improvement power supply reliability, promotion high-quality service, improvement operation maintenance management level.
With the continuous development of market economy in China, the dependence of society on power supply is increasingly strengthened, the influence of power supply interruption on users is difficult to estimate, and at present, the power distribution network automation engineering is fully developed to strive for providing safer and more reliable power supply service for the users. Distribution line automation is a basic function realized in distribution network automation construction at first, and is mainly used for rapidly judging and isolating a fault section and recovering power supply of a non-fault line when the line has a fault. Therefore, the power supply system has the significance of greatly improving the power supply reliability and reducing the operation cost in a short period.
The power distribution terminal is a main technical means for automatic fault location, fault isolation and power supply recovery of the distribution network and is important content for distribution network construction. The power distribution terminal test is mainly used for testing various items of terminal equipment such as DTU/FTU/TTU and the like, and is an important measure for ensuring the standard and reliable operation of a terminal system.
Power distribution terminal tests include laboratory tests and field tests, and their function/performance tests include communication tests, response time tests, analog quantity error tests, state quantity tests, remote control tests, and the like.
Many processes of the existing power distribution terminal testing device need manual operation, the requirement on the skill level of field operators is high, the working difficulty is high, and the efficiency is low.
Disclosure of Invention
The invention provides a power distribution automatic terminal testing system based on modular control, aiming at solving the problems that the existing power distribution terminal testing device needs manual operation, has higher requirements on the skill level of field operators, has higher working difficulty and lower efficiency, and effectively reducing the difficulty and complexity of testing work, reducing the requirements on the skill level of the field operators and improving the working efficiency.
In order to achieve the purpose of the invention, the technical scheme is as follows: a distribution automation terminal test system based on modular control comprises a distribution terminal detection management module, a distribution terminal function detection module, a distribution terminal performance detection module and a distribution terminal case management module;
the power distribution terminal detection management module is used for maintaining and managing detection items, personnel permissions and detection tasks;
the power distribution terminal function detection module is used for detecting and managing power supply, communication, data acquisition, data processing, historical data storage, fault detection and fault recording of the power distribution terminal;
the distribution terminal performance detection module is used for detecting the performance of alternating current input analog quantity errors, the influence quantity of alternating current analog quantity input and the influence of power supply change of the distribution terminal;
the power distribution terminal case management module is used for detecting maintenance and distribution of item information, and realizing new creation and deletion of detection items and updating and upgrading of original item parameters.
Preferably, the power distribution terminal detection management module comprises a detection project management submodule, a personnel authority management submodule and a detection task management submodule;
the detection project management submodule is used for supporting the establishment of detection projects and the configuration of detection project parameters, adding and/or deleting test projects in the detection projects, setting single step and/or sequence execution detection projects, and automatically storing detection data and detection results;
the personnel authority management submodule is used for managing addition and/or deletion of personnel, modification of personnel names and login passwords, personnel roles and authority of each personnel role;
and the detection task management submodule is used for newly building a test task and configuring the detection task according to the detection flow.
Furthermore, the power distribution terminal function detection module comprises a power supply phase failure submodule, a backup power supply management submodule and a matched power supply loading capacity detection submodule;
the power supply phase failure submodule is used for controlling and adjusting the power supply phase failure of the power supply module, collecting the running state of the power distribution terminal in the power supply phase failure state and detecting whether the power distribution terminal can normally work in the power supply phase failure state;
the backup power supply management submodule is used for controlling the power supply module to control the on-off of the power supply module, acquiring data of a backup power supply through the direct current acquisition interface and detecting the function of the backup power supply of the power distribution terminal;
the matched power supply loading capacity detection submodule is used for controlling the state of a load simulation power distribution terminal matched power supply in the communication or switching action process, and realizing the loading capacity detection of the power distribution terminal matched power supply.
Furthermore, the power distribution terminal function detection module further comprises a communication protocol consistency sub-module and a communication interface mis-wiring prevention sub-module;
the communication protocol consistency sub-module is used for simulating a master station to provide a protocol interface, and realizing consistency detection on a power distribution terminal communication protocol according to the implementation details of a power distribution automation DL/T634.5101-2002 protocol and the implementation details of a power distribution automation DL/T634.5104-2009 protocol;
the communication interface prevents mistake wiring submodule piece for on control power supply output 220V voltage received power distribution terminal's RS485 communication terminal, through gathering power distribution terminal's under the state of misconnecting, realize preventing mistake wiring function's detection to power distribution terminal's RS485 communication interface.
Furthermore, the power distribution terminal function detection module also comprises a data acquisition and processing sub-module, a remote signaling function detection sub-module and a parameter retrieval and configuration sub-module;
the data acquisition and processing submodule is used for controlling the power source and/or the state quantity simulation unit to apply excitation quantity to the power distribution terminal, and detecting the analog quantity acquisition, temperature and humidity acquisition, alarm and telemetering dead zone range of the power distribution terminal by acquiring the acquisition and calculation data of the power distribution terminal;
the remote signaling function detection submodule is used for controlling the state quantity simulation unit to apply remote signaling deflection to the power distribution terminal, and detecting remote signaling anti-shake and SOE resolution of the power distribution terminal by acquiring remote signaling and SOE data of the power distribution terminal;
the parameter retrieval and configuration submodule is used for retrieving and configuring the operation parameter communication in the power distribution terminal through the main station, retrieving the inherent parameter and realizing the parameter retrieval and configuration function detection of the power distribution terminal.
Furthermore, the power distribution terminal function detection module also comprises a control function sub-module, a time-keeping sub-module and a maintenance and display sub-module;
the control function sub-module is used for simulating a master station to send a remote control command to the power distribution terminal and acquiring the data of the power distribution terminal through the access acquisition module, so as to realize the detection of remote control output locking of the power distribution terminal, switching on and off of a fault protection function, remote control pressing plates and remote maintenance of a storage battery;
the time synchronization and time conservation submodule is used for simulating a master station and a clock to send a time synchronization command to a power distribution terminal and collecting SOE information of the power distribution terminal so as to realize time synchronization and time conservation function detection of the power distribution terminal;
the maintenance and display submodule is used for communicating with a power distribution terminal, realizing remote use of a maintenance interface, parameter setting and program upgrading, and having an indicator light or a screen for displaying the running state and function detection of abnormal information.
And the power distribution terminal function detection module further comprises a fault detection and processing submodule for controlling the power source and/or the state quantity simulation unit to apply excitation quantity to the power distribution terminal, and realizing the detection of the fault detection and discrimination function of the power distribution terminal by acquiring the acquired data of the power distribution terminal.
And the power distribution terminal function detection module further comprises a historical data storage submodule for inputting remote measurement and remote signaling quantity to the power distribution terminal and carrying out remote control operation, and reading event sequence records and remote control operation records in the power distribution terminal through communication so as to realize the detection of the historical data storage function of the power distribution terminal.
And the power distribution terminal function detection module further comprises a fault recording submodule for generating a recording file when the recording condition is triggered, reading the power distribution terminal recording and realizing the detection of the power distribution terminal fault recording function.
Still further, the distribution terminal performance detection module includes:
the alternating current input analog quantity error detection submodule is used for applying analog quantity to the power distribution terminal and detecting the voltage, current basic error, active power, reactive power basic error, power factor basic error and harmonic component basic error of the power distribution terminal by acquiring the acquisition and calculation data of the power distribution terminal;
the alternating current analog quantity input influence quantity detection submodule is used for applying high-precision analog quantity to a power distribution terminal, and detecting frequency change of input quantity of the power distribution terminal, change quantity caused by harmonic content, change quantity caused by active power and reactive power caused by power factor change, change quantity caused by unbalanced current to three-phase active power and reactive power, change quantity caused by measured excess capacity, output change quantity caused by input voltage change and output change quantity caused by input current change by acquiring collected and calculated data of the power distribution terminal.
And the power supply change influence submodule is used for controlling the power supply module to change voltage, and detecting the influence of power supply change of the power distribution terminal by acquiring the state of the power distribution terminal after the power supply change.
The invention has the following beneficial effects:
by the distribution automation test system, the field workload and the working difficulty of the test work can be effectively reduced, so that the requirement on the skill level of field workers is reduced; the situation that the conventional test work is basically manual operation is changed, and the test work is effectively integrated into a power distribution network operation support platform; the management level of terminal test work is improved and standardized, and a test work plan management system can be effectively constructed preliminarily.
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Fig. 1 is a schematic structural diagram of a distribution automation terminal test system based on modular control provided in embodiment 1.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1, a power distribution automation terminal testing system based on modular control includes a power distribution terminal detection management module, a power distribution terminal function detection module, a power distribution terminal performance detection module, and a power distribution terminal case management module;
the power distribution terminal detection management module is used for maintaining and managing detection items, personnel permissions and detection tasks;
the power distribution terminal function detection module is used for detecting and managing power supply, communication, data acquisition, data processing, historical data storage, fault detection and fault recording of the power distribution terminal;
the distribution terminal performance detection module is used for detecting the performance of alternating current input analog quantity errors, the influence quantity of alternating current analog quantity input and the influence of power supply change of the distribution terminal;
the power distribution terminal case management module is used for detecting maintenance and distribution of item information, and realizing new creation and deletion of detection items and updating and upgrading of original item parameters.
In a specific embodiment, the power distribution terminal detection management module comprises a detection project management submodule, a personnel authority management submodule and a detection task management submodule;
the detection project management submodule is used for supporting the establishment of detection projects and the configuration of detection project parameters, adding and/or deleting test projects in the detection projects, setting single step and/or sequence execution detection projects, and automatically storing detection data and detection results;
the personnel authority management submodule is used for managing addition and/or deletion of personnel, modification of personnel names and login passwords, personnel roles and authority of each personnel role;
and the detection task management submodule is used for newly building a test task and configuring the detection task according to the detection flow.
In a specific embodiment, the power distribution terminal function detection module comprises a power supply phase failure submodule, a backup power supply management submodule and a matched power supply loading capacity detection submodule;
the power supply phase failure submodule is used for controlling and adjusting the power supply phase failure of the power supply module, collecting the running state of the power distribution terminal in the power supply phase failure state and detecting whether the power distribution terminal can normally work in the power supply phase failure state;
the backup power supply management submodule is used for controlling the power supply module to control the on-off of the power supply module, acquiring data of a backup power supply through the direct current acquisition interface and detecting the function of the backup power supply of the power distribution terminal;
the matched power supply loading capacity detection submodule is used for controlling the state of a load simulation power distribution terminal matched power supply in the communication or switching action process, and realizing the loading capacity detection of the power distribution terminal matched power supply.
In a specific embodiment, the power distribution terminal function detection module further includes a communication protocol consistency sub-module and a communication interface mis-wiring prevention sub-module;
the communication protocol consistency sub-module is used for simulating a master station to provide a protocol interface, and realizing consistency detection on a power distribution terminal communication protocol according to the implementation details of a power distribution automation DL/T634.5101-2002 protocol and the implementation details of a power distribution automation DL/T634.5104-2009 protocol;
the communication interface prevents mistake wiring submodule piece for on control power supply output 220V voltage received power distribution terminal's RS485 communication terminal, through gathering power distribution terminal's under the state of misconnecting, realize preventing mistake wiring function's detection to power distribution terminal's RS485 communication interface.
In a specific embodiment, the power distribution terminal function detection module further comprises a data acquisition and processing sub-module, a remote signaling function detection sub-module and a parameter retrieval and configuration sub-module;
the data acquisition and processing submodule is used for controlling the power source and/or the state quantity simulation unit to apply excitation quantity to the power distribution terminal, and detecting the analog quantity acquisition, temperature and humidity acquisition, alarm and telemetering dead zone range of the power distribution terminal by acquiring the acquisition and calculation data of the power distribution terminal;
the remote signaling function detection submodule is used for controlling the state quantity simulation unit to apply remote signaling deflection to the power distribution terminal, and detecting remote signaling anti-shake and SOE resolution of the power distribution terminal by acquiring remote signaling and SOE data of the power distribution terminal;
the parameter retrieval and configuration submodule is used for retrieving and configuring the operation parameter communication in the power distribution terminal through the main station, retrieving the inherent parameter and realizing the parameter retrieval and configuration function detection of the power distribution terminal.
In a specific embodiment, the power distribution terminal function detection module further includes a control function sub-module, a time-keeping sub-module, and a maintenance and display sub-module;
the control function sub-module is used for simulating a master station to send a remote control command to the power distribution terminal and acquiring the data of the power distribution terminal through the access acquisition module, so as to realize the detection of remote control output locking of the power distribution terminal, switching on and off of a fault protection function, remote control pressing plates and remote maintenance of a storage battery;
the time synchronization and time conservation submodule is used for simulating a master station and a clock to send a time synchronization command to a power distribution terminal and collecting SOE information of the power distribution terminal so as to realize time synchronization and time conservation function detection of the power distribution terminal;
the maintenance and display submodule is used for communicating with a power distribution terminal, realizing remote use of a maintenance interface, parameter setting and program upgrading, and having an indicator light or a screen for displaying the running state and function detection of abnormal information.
In a specific embodiment, the power distribution terminal function detection module further includes a fault detection and processing sub-module, which is configured to control the power source and/or the state quantity simulation unit to apply an excitation quantity to the power distribution terminal, and implement detection of the power distribution terminal fault detection and discrimination function by acquiring data collected by the power distribution terminal.
In a specific embodiment, the power distribution terminal function detection module further includes a historical data storage submodule, which is used for inputting remote measurement and remote signaling quantity to the power distribution terminal and performing remote control operation, and reading event sequence records and remote control operation records in the power distribution terminal through communication, so as to realize detection of the historical data storage function of the power distribution terminal.
In a specific embodiment, the power distribution terminal function detection module further includes a fault recording sub-module, configured to generate a recording file when a recording condition is triggered, and read the power distribution terminal recording file to implement power distribution terminal fault recording function detection.
In a specific embodiment, the power distribution terminal performance detection module includes:
the alternating current input analog quantity error detection submodule is used for applying analog quantity to the power distribution terminal and detecting the voltage, current basic error, active power, reactive power basic error, power factor basic error and harmonic component basic error of the power distribution terminal by acquiring the acquisition and calculation data of the power distribution terminal;
the alternating current analog quantity input influence quantity detection submodule is used for applying high-precision analog quantity to a power distribution terminal, and detecting frequency change of input quantity of the power distribution terminal, change quantity caused by harmonic content, change quantity caused by active power and reactive power caused by power factor change, change quantity caused by unbalanced current to three-phase active power and reactive power, change quantity caused by measured excess capacity, output change quantity caused by input voltage change and output change quantity caused by input current change by acquiring collected and calculated data of the power distribution terminal.
And the power supply change influence submodule is used for controlling the power supply module to change voltage, and detecting the influence of power supply change of the power distribution terminal by acquiring the state of the power distribution terminal after the power supply change.
In a specific embodiment, the power distribution terminal performance detection module is configured to perform the following performance detection on the power distribution terminal:
(a) other tests of power frequency AC
High-precision analog quantity is applied to the power distribution terminal, and excessive input, allowable error and fault current input detection of the power distribution terminal are realized by acquiring the acquisition and calculation data of the power distribution terminal.
(b) Influence of power supply variation
The power supply module is controlled to change voltage, and the power distribution terminal state after the power supply change is collected, so that the influence on the power supply change of the power distribution terminal is detected.
(c) Stability of continuous operation
The detection of the continuous operation stability of the power distribution terminal is realized by acquiring the state of the power distribution terminal in the continuous operation process.
As an alternative embodiment, the power distribution terminal case management module is configured to: the method comprises the steps of carrying out operations such as maintenance and distribution of detection item information, realizing new creation and deletion of detection items and updating and upgrading of original item parameters, carrying out loading and rapid distribution on detection cases generated according to historical items, selecting automatic loading cases according to detection test types and power distribution terminal types, and supporting platform transplantation and online release by user-defined maintenance configuration.
The embodiment realizes an intelligent integration and a highly automatic test system, the distribution automation main station and the distribution automation terminal test system are interacted through a wireless network protocol, the distribution automation terminal test system applies different analog quantity and state position to the distribution terminal through the automatic test scheme, the distribution automation main station monitors various behaviors of the distribution terminal, the distribution automation main station is accessed into a region through the main station safety, the mobile operator wireless 4G special network transmits the data to the distribution automation test terminal system for processing and operation, and the conclusion is given.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a distribution automation terminal test system based on modular control which characterized in that: the test system comprises a power distribution terminal detection management module, a power distribution terminal function detection module, a power distribution terminal performance detection module and a power distribution terminal case management module;
the power distribution terminal detection management module is used for maintaining and managing detection items, personnel permissions and detection tasks;
the power distribution terminal function detection module is used for detecting and managing power supply, communication, data acquisition, data processing, historical data storage, fault detection and fault recording of the power distribution terminal;
the distribution terminal performance detection module is used for detecting the performance of alternating current input analog quantity errors, the influence quantity of alternating current analog quantity input and the influence of power supply change of the distribution terminal;
the power distribution terminal case management module is used for detecting maintenance and distribution of item information, and realizing new creation and deletion of detection items and updating and upgrading of original item parameters.
2. The modular control-based distribution automation terminal testing system of claim 1, wherein: the power distribution terminal detection management module comprises a detection project management submodule, a personnel authority management submodule and a detection task management submodule;
the detection project management submodule is used for supporting the establishment of detection projects and the configuration of detection project parameters, adding and/or deleting test projects in the detection projects, setting single step and/or sequence execution detection projects, and automatically storing detection data and detection results;
the personnel authority management submodule is used for managing addition and/or deletion of personnel, modification of personnel names and login passwords, personnel roles and authority of each personnel role;
and the detection task management submodule is used for newly building a test task and configuring the detection task according to the detection flow.
3. The modular control-based distribution automation terminal testing system of claim 1, wherein: the power distribution terminal function detection module comprises a power supply phase failure submodule, a backup power supply management submodule and a matched power supply loading capacity detection submodule;
the power supply phase failure submodule is used for controlling and adjusting the power supply phase failure of the power supply module, collecting the running state of the power distribution terminal in the power supply phase failure state and detecting whether the power distribution terminal can normally work in the power supply phase failure state;
the backup power supply management submodule is used for controlling the power supply module to control the on-off of the power supply module, acquiring data of a backup power supply through the direct current acquisition interface and detecting the function of the backup power supply of the power distribution terminal;
the matched power supply loading capacity detection submodule is used for controlling the state of a load simulation power distribution terminal matched power supply in the communication or switching action process, and realizing the loading capacity detection of the power distribution terminal matched power supply.
4. The modular control-based distribution automation terminal testing system of claim 3, characterized in that: the power distribution terminal function detection module also comprises a communication protocol consistency sub-module and a communication interface mis-wiring prevention sub-module;
the communication protocol consistency sub-module is used for simulating a master station to provide a protocol interface, and realizing consistency detection on a power distribution terminal communication protocol according to the implementation details of a power distribution automation DL/T634.5101-2002 protocol and the implementation details of a power distribution automation DL/T634.5104-2009 protocol;
the communication interface prevents mistake wiring submodule piece for on control power supply output 220V voltage received power distribution terminal's RS485 communication terminal, through gathering power distribution terminal's under the state of misconnecting, realize preventing mistake wiring function's detection to power distribution terminal's RS485 communication interface.
5. The modular control-based distribution automation terminal testing system of claim 4, characterized in that: the power distribution terminal function detection module also comprises a data acquisition and processing sub-module, a remote signaling function detection sub-module and a parameter retrieval and configuration sub-module;
the data acquisition and processing submodule is used for controlling the power source and/or the state quantity simulation unit to apply excitation quantity to the power distribution terminal, and detecting the analog quantity acquisition, temperature and humidity acquisition, alarm and telemetering dead zone range of the power distribution terminal by acquiring the acquisition and calculation data of the power distribution terminal;
the remote signaling function detection submodule is used for controlling the state quantity simulation unit to apply remote signaling deflection to the power distribution terminal, and detecting remote signaling anti-shake and SOE resolution of the power distribution terminal by acquiring remote signaling and SOE data of the power distribution terminal;
the parameter retrieval and configuration submodule is used for retrieving and configuring the operation parameter communication in the power distribution terminal through the main station, retrieving the inherent parameter and realizing the parameter retrieval and configuration function detection of the power distribution terminal.
6. The modular control-based distribution automation terminal testing system of claim 5, characterized in that: the power distribution terminal function detection module also comprises a control function sub-module, a time-keeping sub-module and a maintenance and display sub-module;
the control function sub-module is used for simulating a master station to send a remote control command to the power distribution terminal and acquiring the data of the power distribution terminal through the access acquisition module, so as to realize the detection of remote control output locking of the power distribution terminal, switching on and off of a fault protection function, remote control pressing plates and remote maintenance of a storage battery;
the time synchronization and time conservation submodule is used for simulating a master station and a clock to send a time synchronization command to a power distribution terminal and collecting SOE information of the power distribution terminal so as to realize time synchronization and time conservation function detection of the power distribution terminal;
the maintenance and display submodule is used for communicating with a power distribution terminal, realizing remote use of a maintenance interface, parameter setting and program upgrading, and having an indicator light or a screen for displaying the running state and function detection of abnormal information.
7. The modular control-based distribution automation terminal testing system of claim 6, characterized in that: the power distribution terminal function detection module also comprises a fault detection and processing submodule for controlling the power source and/or the state quantity simulation unit to apply excitation quantity to the power distribution terminal, and realizing the detection of the fault detection and discrimination function of the power distribution terminal by acquiring the collected data of the power distribution terminal.
8. The modular control-based distribution automation terminal testing system of claim 7, wherein: the power distribution terminal function detection module further comprises a historical data storage submodule for inputting remote measurement and remote signaling quantity to the power distribution terminal and carrying out remote control operation, and event sequence records and remote control operation records in the power distribution terminal are read through communication, so that the historical data storage function detection of the power distribution terminal is realized.
9. The modular control-based distribution automation terminal testing system of claim 8, wherein: the power distribution terminal function detection module further comprises a fault recording submodule for generating a recording file when the recording condition is triggered, reading the power distribution terminal recording and realizing the detection of the fault recording function of the power distribution terminal.
10. The modular control-based distribution automation terminal testing system of claim 1, wherein: the power distribution terminal performance detection module comprises:
the alternating current input analog quantity error detection submodule is used for applying analog quantity to the power distribution terminal and detecting the voltage, current basic error, active power, reactive power basic error, power factor basic error and harmonic component basic error of the power distribution terminal by acquiring the acquisition and calculation data of the power distribution terminal;
the alternating current analog quantity input influence quantity detection submodule is used for applying high-precision analog quantity to a power distribution terminal, and detecting frequency change of input quantity of the power distribution terminal, change quantity caused by harmonic content, change quantity caused by active power and reactive power caused by power factor change, change quantity caused by unbalanced current to three-phase active power and reactive power, change quantity caused by measured excess capacity, output change quantity caused by input voltage change and output change quantity caused by input current change by acquiring collected and calculated data of the power distribution terminal.
And the power supply change influence submodule is used for controlling the power supply module to change voltage, and detecting the influence of power supply change of the power distribution terminal by acquiring the state of the power distribution terminal after the power supply change.
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| CN116840622A (en) * | 2023-07-07 | 2023-10-03 | 云木科技有限公司 | Power distribution terminal test system based on electric quantity input and output comparison calculation |
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