Electrical Power Quality Monitoring Device

An ideal power system should provide users with a constant frequency sine wave voltage, while with the advancement of power electronics technology, ...

Development of direct current transmission and high-power single-phase rectification technology has been widely applied in industrial sectors and electrical equipment, such as high-power controllable

Silicon devices, switch mode power supplies, variable frequency drives, and other typical nonlinear loads will draw or inject harmonic currents into the power grid, thereby

Induces voltage distortion in the power grid, pollutes the grid waveform, degrades power supply quality, increases additional losses, and reduces transmission capacity.

A significant factor affecting the quality of electrical power. In the power grid, unbalanced three-phase loads and resonance grounding in the power system can generate negative

Order, high-power rectifiers and nonlinear equipment, etc., generate harmonics. Negative sequence and harmonics seriously affect the quality of power supply, affecting them first.

Sound power equipment operates safely. Harmonics may cause resonance, with the resonant high voltage applied across the capacitor terminals due to the higher-order harmonics.

The container has very low impedance, thus the capacitor is prone to overloading and breakdown; high-order harmonic currents flowing into the transformer increase core losses; high

Harmonic currents flowing into the motor not only increase core loss but also cause vibration in the rotor, severely affecting processing quality; high

Harmonics cause protective devices to malfunction, increasing system losses; higher-order harmonics can lead to voltage resonance in the power system, affecting the lines.

Overvoltage can cause insulation breakdown in equipment. Negative sequence and harmonics not only have a thermal effect on generators, causing local heating, but also...

Vibration and noise are induced in the generator set, posing a serious threat to the safe and stable operation of the unit. Our company's KN-612

The power quality monitoring device utilizes a state-of-the-art 32-bit DSP processor, featuring high-speed sampling, computation, analysis, statistics, and communication.

A power quality monitoring device integrated with display functions. Capable of real-time monitoring up to 63 times harmonic content and harmonics.

Total Distortion Ratio, Three-Phase Voltage Unbalance, Flicker, Voltage Deviation, Voltage Fluctuation, Frequency, Active Power of Each Harmonic

Power rating, true power factor, phase shift power factor, true RMS value, positive and negative sequence, etc., electrical energy quality indicators.

The hardware platform of the device boasts the following main features:

1) Utilizing a 32-bit DSP from TI Corporation as the core, featuring powerful data processing and logic/control capabilities, core hardware

At the forefront of domestic advancements.

2) Utilizing an internationally advanced embedded real-time operating system as the software platform, all software is programmed in high-level languages, ensuring

High reliability and portability of the system;

3) The data acquisition channel features a single-channel, single-A/D design, with each channel exclusively using a 16-bit parallel A/D, ensuring fully synchronous sampling.

Higher precision, faster speed.

4) Large storage capacity to meet the data storage requirements of power quality monitoring devices; real-time data is not lost during power failure.

5) Utilizes phase-locked loop technology to prevent the impact on monitoring indicators during frequency changes in the power system, thus preventing frequency "leakage."

6) Utilizes a four-layer printed circuit board (PCB) and SMT technology, along with the "back-insertion" structure commonly used in relay protection devices.

In addition to monitoring the conventional steady-state power quality indicators, the device also detects transient disturbances in power quality, primarily sudden changes in voltage.

Monitor and record fluctuations and abrupt drops.The recording is highly practical. The device primarily features the following functions:

1) Basic measurement quantities

Power Grid Frequency; RMS voltage and current; Total active, reactive power and power factor.

2) Basic Monitoring Indicators

a) Three-phase fundamental voltage and current RMS values, fundamental power, power factor, phase, etc.

b) Voltage Deviation

c) Frequency Deviation

d) Three-phase voltage unbalance, three-phase current unbalance, negative sequence voltage, and current.

e) Harmonics (2-63 times). Includes total harmonic distortion rate of voltage and current, harmonic content rate of each order, amplitude, and phase.

Active and reactive power of each harmonic;

3) Advanced Monitoring Indicators

a) Interharmonics

b) Voltage fluctuations, flickers;

c) Sudden voltage surges, drops, or short interruptions.

4) Display Function

The device panel features a large-screen LCD display, graphically showing real-time data of the main power quality monitoring indicators.

5) Setup Function

The device hardware clock can be set, monitoring parameters can be configured, modified, and viewed, and a password protection is provided.

6) Record Storage Function

Real-time saving of basic and advanced monitoring indicators, with the ability to set the statistical time interval. 3-minute data (save high values,

Low value, average value95% probability for the higher value item is stored on the device, retains data during power failure, and then is accessed following the "first in, first out" principle.

Principles Update.

7) Statistical Function

The device features online statistics for primary monitoring indicators, enabling it to calculate the maximum, minimum, and average values of the monitoring indicators within a specified time period.

Mean, 95% confidence intervalRates and values.

8) Communication Features

The device offers various communication interfaces, enabling real-time transmission of monitoring data or scheduled extraction and storage of records, accessible via industrial protocols.

TooNet interface and remoteThe Fangdi Power Quality Management Center can communicate through RS232C/RS485 interfaces for long-distance communication.

9) Transient Event Triggers Waveform Recording Function

Events can be set with trigger limits according to customer requirements, recording and saving real-time data before and after the event trigger, as well as saving event-day data.

Available for inquiry.