Maximum Demand Controller Three-Phase Intelligent Power Meter With Fault Recording Harmonic Monitoring RS485 MQTT

1. Overview

1.1 WEM533 Functional Description

WEM533 three-phase intelligent power meter (hereinafter referred to as WEM533) is a product of Yantai Dongfang Weston Electric Co., Ltd.

The intelligent power meter developed by Co., Ltd. integrates fault recording, curve display, measurement, metering, power quality Analysis, accident alarm, switch input, switch output, residual/zero sequence current monitoring, 485 communication, etc.

It can be integrated into one. It meets GB/T 17215.321, GB/T 17215.323 and other standards.

Applications of WEM533 include:

ÿ Power transformation and distribution automation

ÿ Medium and low voltage power distribution systems

ÿ Industrial Automation

ÿ Smart buildings

ÿ Energy Management System

ÿIndustrial machinery and equipment

3.1 Real-time clock

The clock error is within 0.5s/d, with calendar, timing and leap year automatic switching functions, independent hardware temperature

Make up the clock chip.

3.2 Fault Recording

Fault recording file format: COMTRADE format;

Fault recording sampling density: 128 points per recording cycle;

Fault recording save items: maximum 32 items

Fault recording trigger conditions: support overcurrent, overvoltage, low voltage and other fault triggers, support setting of trigger thresholds;

3.3 Measurement and metrology

The instrument can measure the positive and negative active energy, input and output reactive energy, and can also measure A, B,

C Three-phase voltage, three-phase current, each phase and total active power, reactive power, apparent power, power factor and frequency, and has the maximum demand record accumulation.

It has the function of freezing electric energy data (the default freezing time is 24:00 at the end of each month). The meter can store 12

All stored data will not be lost after power failure and can be maintained for more than 10 years.

3.4 Power Quality

The instrument can measure the voltage negative sequence and zero sequence unbalance, and the 51st harmonics of the three-phase voltage and current. The distortion rate of odd harmonics and even harmonics in the 51st harmonics of three-phase voltage and current are measured.

The voltage deviation, frequency deviation, voltage sag and short-term interruption and other power quality

Monitor quantity issues.