Application case of intelligent power transmitter and relay output module in electrical monitoring system
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I. Introduction
With the development of communication technology and control technology, centralized monitoring and management has become an inevitable trend in the development of building intelligent management. Due to the scattered distribution of power distribution rooms, distribution boxes, control switches, and air conditioners in the office building, it is difficult to timely and effectively understand the safe operation status of each power distribution equipment; the elevator power supply is far away from the duty room, and it is difficult for the duty staff to know in real time. Elevator power supply status; building safety monitoring points and fire monitoring points can only be managed centrally by forming a network. In order to realize the efficient and intelligent management of the power building, this electrical monitoring automation system for the power building was developed.
2. Overview of the building
The power distribution system of the power building of the Power Management Corporation mainly includes the lighting distribution of the office building, the power distribution, and the high-voltage and low-voltage distribution of the 6KV power distribution room. The lighting power distribution system of the office building is mainly divided into two separate power distribution systems for the new building and the old building. The low-voltage lighting power supply is provided by the 6KV power distribution room located at the rear of the building. The power distribution of the 12 floors in the old building is provided by the power distribution cabinets distributed on the 1st, 6th, 9th and 11th floors respectively; the power distribution of the new building, including the 11 floors in the basement, is provided by the power distribution bus in the power distribution room of the new building. row provided. The 4 power distribution cabinets in the old building provide power to the wall distribution boxes on each floor, and the wall distribution boxes on each floor include 1 incoming line and 16 outgoing lines; the new building wall distribution box includes 1 incoming line and 13 outgoing lines . The 6KV power distribution room includes two parts, the high-voltage room and the low-voltage room. The high-voltage room includes 2 incoming lines and a group of high-voltage bus ties;
3. Working principle
Electric power building electrical monitoring automation system is a distributed system of distributed control concept. It adopts the structure form of three levels and independent modules. The electrical measurement and control unit transmits the electrical state quantities of each circuit and the real-time data of important branches collected on site to the information processing unit. The information processing unit processes the received information, uploads it to the monitoring center unit, and executes the commands issued by the monitoring center unit. .
Monitoring unit: The central computer mainly plays a monitoring role and completes the man-machine dialogue. It analyzes various data transmitted by each monitoring unit, dynamically displays each area, real-time operation information, and alarms over limit. The central computer has an operation information database, which stores monitoring and operation reports for more than half a year.
Information processing unit: PCC, as an information processing unit, mainly completes data processing, uploading and releasing of information.
Electrical measurement and control unit: mainly for on-site data collection and control.
4. Intelligent module
1. R-8073N/W multifunctional intelligent power acquisition module
This product integrates micro-control computer chip, digital signal processing chip, standard communication interface, compatible with RS-485 or RS-232 interface, and can complete functions such as measurement, calibration, setting, telemetry, and remote adjustment. Due to its small size, multiple functions and high precision, it can be used for measurement, metering, remote centralized meter reading, monitoring and management in various AC power applications. It has excellent performance and low price, which can effectively reduce the user’s cost of use.
Specification:
The number of measured circuits: three-phase current, voltage, 1-way DI, 2-way DO transformer position
Built-in (R-8073N)
External (R-8073W)
Measured parameters: true RMS of current and voltage, power factor, active power, reactive power, frequency, power factor, input active energy, output active energy, total energy, reactive energy, apparent power, total apparent power of
Input frequency: 47～75Hz
Voltage range: 10~500V, higher voltage can be measured by adding voltage transformer and setting voltage transformation ratio
Current range: basic range 0～5A, can measure larger current by adding current transformer and setting current transformation ratio
Signal processing: 16-bit A/D conversion, 6 channels, each channel is synchronously sampled at a 4KHz rate, and the real-time data of the module is a true RMS value of 1 second (refreshed once per second)
Overload capacity: 1.4 times the range input can be measured correctly; instantaneous (10 cycles) current 5 times, voltage 3 times the range without damage
Output data: three-phase voltage Ua, Ub, Uc; three-phase current Ia, Ib, Ic; active power P, reactive power Q, power factor PF, frequency f, active power Pa, Pb, Pc of each phase; Power Qa, Qb, Qc; forward active power, reverse active power, forward reactive power, reverse reactive power and other electrical parameters
Output interface: RS-485/RS-232, jumper selectable
Communication rate: 1200/2400/4800/9600BPS
Communication protocol: ASCII command set and MODBUS/ASCII, MODBUS RTU protocol
Accuracy class: current and voltage class 0.2, other class 0.5
Parameter setting: module address, communication rate, voltage and current ratio can be set through the communication interface
Power supply: +10V～+30VDC or 220VAC
With upper and lower limit alarm, phase loss alarm, overload alarm, overvoltage alarm, undervoltage alarm
Built-in real-time clock, providing year, month, day, hour, minute, second information, equipped with lithium battery, to ensure the clock 10 years of uninterrupted power supply
2. R-8060/R-8060+ (4-channel isolated digital input/4-channel relay output module)
4 single-ended digital inputs
High level: 3.5V～30V
Low level: 0～1V
Input isolation voltage: 5000V
Input impedance: 3KΩ
4 relay outputs
Contact capacity: 2A@220VAC, 2A@24VDC
With Modbus communication protocol (R-8060+)
5. Structural composition
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