Three phase 1140V energy meter

1、 Overview

APM5 seriesThree phase 1140V energy meter0.2S metering+485 communication+Ethernet communication (hereinafter referred to as the instrument) is designed according to IEC international standards and has functions such as full power measurement, power statistics, power quality analysis, event recording, and network communication. It is mainly used for comprehensive monitoring of power supply quality in the power grid. This series of instruments is equipped with feature rich DI/DO modules, which can flexibly achieve full power measurement and switch status monitoring of electrical circuits.

2、 Product model, specifications, and functions

3、 Model Function

Measurement parameters: full energy measurement, four quadrant energy, phase separated energy, apparent energy, and multi rate energy

Pulse output: total active and total reactive power pulse output

Demand: three-phase current, active power, reactive power, apparent power, real-time demand, and extreme demand (including timestamp)

Extreme value statistics: current, line voltage, phase voltage, active power, reactive power and other electrical parameters, extreme values of this month and the previous month (including timestamp)

Power quality: current, line voltage, phase voltage imbalance, voltage phase angle, current phase angle, total (odd, even) harmonic content of voltage and current, voltage and current sub harmonic content (2-63 times), voltage peak coefficient, telephone waveform factor, current K coefficient, vector diagram

Event record: DIDO record, can record the last 128 DIDO records

Alarm record: can record the latest 128 alarm records

Communication: Modbus RTU protocol, DL/T 645-2007 protocol, Ethernet communication/MODBUS-TCP

96 appearance: 2-channel switch input+2-channel switch output

4、 Appearance and installation dimensions

Three phase 1140V energy meterAnd the size of the disk opening (unit: mm)

Figure 2 APM520 Dimensional Diagram

Note: If instruments are installed side by side on a unified horizontal plane, it is recommended that the spacing between instrument openings be 30mm. The default opening is 88 * 88, and 92 * 92 opening instruments have added gaskets.

5、 Construction precautions

Voltage input:

The input voltage should not exceed 120% of the rated input voltage of the product (100V or 110V or 400V or 690V or 1140V), otherwise PT should be used; a 1A fuse must be installed at the voltage input end; The wiring method of the product needs to be set according to its PT wiring method, as follows:

APM520 wiring terminal diagram: "4, 5, 6, 7, 8, 9" are current signal input terminal numbers; Voltage signal input terminal numbers for "11, 12, 13, 14"; 1 and 2 "are the terminal numbers for the auxiliary power supply of the instrument; 21 and 22 "are communication terminal numbers; 17 and 39 "are the terminal numbers for electric energy pulse output; 30, 31, 39 "are switch input terminal numbers; 40 and 49 are relay output terminal numbers. (The specific wiring is mainly based on the physical object)

Current input:

The rated input current is 1A or 5A, and an external CT is required (it is recommended to use a wiring harness instead of directly connecting to the CT for ease of disassembly and assembly); Ensure that the input current corresponds to the voltage, the phase sequence is consistent, and the direction is consistent; If other instruments are connected to the CT circuit used, the wiring should be connected in series; Before removing the current input connection of the product, be sure to disconnect the CT primary circuit or short-circuit the secondary circuit first!

Communication wiring:

The instrument provides asynchronous half duplex RS485 communication interface, using MODBUS-RTU protocol, and various data information can be transmitted on the communication line. It is recommended to use shielded twisted pair cables for communication connections, with a cross-sectional area of no less than 0.5mm2 per core. When wiring, communication lines should be kept away from strong electrical cables or other strong electric field environments.

The wiring example for the communication part is shown in the following figure:

Correct wiring method: The shielding layer of the communication cable is grounded. It is recommended to add matching resistors between A and B at the end of the instrument, with a resistance range of 120 Ω~10 k Ω. Communication wiring should be connected hand in hand, and tree or star connections are prohibited;