Three phase multifunctional power monitoring instrument (color screen harmonic)

The three-phase multifunctional power monitoring instrument (color screen harmonic) is designed for the intelligent monitoring and energy measurement needs of power systems, industrial and mining enterprises, public facilities, intelligent buildings, etc. It can accurately measure all commonly used power parameters in the three-phase power grid, including three-phase voltage, three-phase current, active power, reactive power, apparent power, frequency, power factor, four quadrant energy, multi rate energy, etcUIPQFunctions such as demand analysis, harmonic analysis, and monitoring of switch input and output.

This series of productsThere are various input and output methods with multiple expansion functions to choose from:1Road communication interface2Road analog output2Circuit relay outputLocal or remote switch signal monitoring and control output function（“remote signaling”and“remote control”Function)、4Road switch monitoring2Functions such as road power pulse output and multi rate power statistics.

It has a high cost performance ratio and can directly replace conventional power transmitters, measurement indicators, energy meters, and related auxiliary units. As an advanced intelligent and digital front-end acquisition component for the power grid, network power meters have been widely used in various control systemsSCADAIn systems and energy management systems, substation automation, distribution network automation, community power monitoring, industrial automation, intelligent buildings, intelligent distribution panels, and switchgear, it has the advantages of easy installation, simple wiring, easy maintenance, small engineering quantity, programmable input parameters on site, and the ability to complete different tasks in the industryPLCNetworking of industrial control computer communication software.

Main technical parameters

Installation dimensions and wiring diagram

3.1 Instrument size

Typical Connection Diagram

The wiring diagram of the specific product is similar to it,It's just a reduction in wiring terminals and functional modules.

Attention: The wiring terminal sequence of each product is slightly different. Please connect according to the markings on the product casing when wiring.

Input signal wiring method

explain:

A.Voltage input: The input voltage should not exceed the rated input voltage of the product（100Vperhaps400V）Otherwise, consideration should be given to usingPTFor ease of maintenance, it is recommended to use a wiring harness.

B.Current input: The standard rated input current is5A, greater than5AThe situation should be handled externallyCTIf usedCTIf there are other instruments connected, the wiring should be in series. Before removing the current input connection of the product, be sure to disconnect it firstCTFor maintenance purposes, it is recommended to use a wiring harness instead of directly connecting the primary circuit or short circuiting the secondary circuitCT.

C.Ensure that the input voltage and current correspond, the phase sequence is consistent, and the direction is consistent; Otherwise, numerical and symbol errors may occur! (Power and electrical energy).

D.The instrument can work in three-phase four wire mode or three-phase three wire mode, and users should choose the corresponding wiring method according to the on-site usage situation. Generally, the three-phase three wire method is used when there is no centerline, and the three-phase four wire method is used when there is a centerline. The three-phase three wire method can only be installed2individualCT（AandCThree phases and four wires need to be installedCT(In only2CTIn this case, another phase current can be synthesized.Attention: Two wiring methods can be set inside the instrument, and the actual wiring method must be consistent with the setting method inside the instrument, otherwise the measurement data of the instrument will be inaccurate.

PRODUCT FUNCTION

communication module

physical layer

RS485Communication interface, asynchronous half duplex mode;

Communication speed4800～19200bpsCan be set, factory default is9600 bps；

Byte transfer format:1Starting position,8The bit data is,1Bit checksum,2-3bit stop bit(N81 N82 E81 O81)Optional;

Communication protocolMODBUS-RTU

MODBUSThe protocol adopts a master-slave response communication connection method on a communication line. Firstly, the signal from the host is addressed to a unique address slave, and the response signal sent by the slave is transmitted to the host in the opposite direction, that is, on a separate communication line, the signal transmits all communication data streams in opposite directions (half duplex working mode).

MODBUSThe protocol only allows on the host（PC，PLCCommunication between terminal devices is not allowed, and data exchange between independent terminal devices is not allowed. This way, each terminal device will not occupy the communication line during their initialization, but only respond to query signals that arrive locally.