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What is the Principle of Power Monitoring System? System Functions of Power Monitoring System

Date:2023-04-27

The power monitoring system can find various power consumption omissions involving tens of millions of users. Electricity is the most versatile and common form of energy in the world, and most of the resources are converted into electric energy by human beings in various ways. There are endless.

 

Power Monitoring System


1. System functions of power monitoring system

1.1 General requirements
The power monitoring system integrates and centralizes all functions of the substation, applies automatic control technology, computer digital technology and digital information transmission technology, and integrates the interconnected parts of the substation into an organic whole to complete the process from Substation safety monitoring, remote monitoring and dispatching control to single point and public point operation processing.

The design, configuration and type selection of the power monitoring system comply with international standards, international industrial standards and domestic standards.
The power monitoring system should adopt redundant configuration, which can prevent the loss of power monitoring system information or affect the main functions of the power monitoring system when any single hardware or software fails.

1.2 Data collection and processing
The analog quantity, digital quantity, pulse quantity and temperature quantity from the production process are collected through the bay layer unit. The production process equipment includes CT, PT, power distribution device protection, DC system, and power monitoring system. Perform digital filtering, validity check, engineering value conversion, fault judgment, signal contact jitter elimination, scale calculation and other processing on the collected input quantity. As a result, various real-time data such as current, voltage, active power, reactive power, electric degree, power factor, etc. that can be applied are generated for database update. When possible, a distributed database structure is formed, and various real-time data processed locally are kept in the local control unit. The bay layer units should be relatively independent in the collection of protection analog quantities and telemetry analog quantities, and the accuracy of telemetry should meet the requirements of relevant standards.

1.3 Statistical calculations
Perform statistics, analysis, and calculation on real-time data to generate voltage qualification rate, load rate, digital input state quantity logic operation value, equipment normal/abnormal displacement times, etc.; and provide some standard calculation functions to generate user-definable virtual The measuring point carries on the average value, the integral value and other calculation statistics. The specific algorithm is formulated according to the requirements of the buyer.

1.4 Screen display
Various information screens of the substation are displayed through the large-screen LCD of the station-level control machine and man-machine contact tools. The displayed content mainly includes the position status of all equipment, displacement information, protection equipment action and reset information, DC system and power consumption. Power monitoring system information, real-time data of each measured value, various alarm information, status information of the computer monitoring system.

In the screen that needs to be displayed in partitions, it can be divided into: process screen area, prompt information area, and alarm information area according to requirements. Each area displays information synchronously without interfering with each other.

The display screen can be modified, defined, edited, generated, deleted by the user online interactively, and the total number of screens is ≥128.

1.5 Record function
The recording function means that the computer station control system outputs various required information to the printing paper in the specified format through the printer.

1.5.1 State change records: State change records include accident state change records, response state change records and computer monitoring system abnormal state records. When the state changes, the change time and change information should be printed out immediately.
1.5.2 Data record: print out the measured values in different forms such as random, regular, daily, monthly, etc.
1.5.3 Screen record: The screen displayed on the workstation can be printed out with a printer according to the requirements of the operator.
1.5.4 Accident recall record: used to analyze the changes of important real-time parameters and SOE at a specific moment during the period of five frames before the accident and ten frames after the accident, and store it in the text of the recall report, and print out according to user requirements .
1.5.5 Other records: such as control operation records, etc. will be mentioned in the corresponding description, and also printed out.

1.6 Sequence of events recording
The content of the event sequence record is the record of rapid accident state changes, including the analog quantity recall table before and after the main transformer accident, the time resolution should not be greater than 1 millisecond, and it should be printed out in the required report form.

1.7 Alarm processing
There are two ways to report to the police, one is accident alarm, and the other is forecast alarm. The former includes tripping of circuit breakers and action signals of protective devices caused by non-operation. The latter includes general equipment displacement, state abnormal information, analog quantity overrun/re-limit, various components of the computer station control system, and abnormal state of the bay layer unit.

1.8 Control functions
It can compile, manage and invoke operation tickets, some equipment status reports and equipment files.

1.9 Operation lockout
The computer provides necessary operation steps and sufficient software and hardware checking functions to ensure the legality, rationality, safety and correctness of the operation steps of the electrical equipment by the operator. In addition, mutual locking between arbitrary remote control operations can also be realized, and it can be opened to users, and the locking conditions can be set by users themselves.

The conventional mechanical five-prevention and electromagnetic locking device is used to implement the anti-mistake function.

1.10 Operation authority
With operation authority level management, when the correct operation password and guardian password are entered, the operator has the right to control the operation, modify the parameters, and record the information. And it has the function of recording the person who modified the operation and the content of the operation modified.

1.11 Interface with other devices
The computer monitoring system has the ability to interface with other equipment configured by the buyer.

1.12 Maintenance function
The maintenance function refers to the diagnosis, management, maintenance and expansion of the power monitoring system performed by the engineer responsible for managing the computer monitoring system in the substation through the workstation.

1.12.1 Database maintenance: Modify, add and delete each data item in the database in an interactive way online. The content that can be modified is: the number of each data item, the text description of each data item, the status description of the digital quantity, each input The definition of quantity alarm processing, various limits of measured values, the acquisition period of measured values, the dead zone of measured value over-limit processing, the calculation coefficient of measured value conversion, the definition of normal and abnormal status of digital input, and the various aspects of output control. parameters etc.

1.12.2 Function maintenance: start and stop of automatic control functions, monitor the running status of various application functions, generate various reports online and edit the display screen online.

1.12.3 Fault diagnosis of the station control system: check the status of each device of the computer station control system, determine the location of the fault through online self-diagnosis, and send an alarm signal, and the inspection and diagnosis results can be displayed and printed out.

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