Power Quality Online Monitoring Device

1. Features of Power Quality Monitoring Device TC-300B

Reliable: Voltage input uses high-voltage isolation modules, and current input uses high-precision current transformers to isolate the input signal from the measurement system. This significantly enhances the anti-interference capability of the TC-300B.

User-friendly: The power quality monitoring device features a large Chinese screen interface and simple button operations, making it more convenient for users.

High Accuracy: Complies with the requirements of Class A instruments per national standards. It uses benchmark algorithms for harmonics and three-phase unbalance, with no approximate calculations. It employs high-precision A/D (16-bit) and simultaneous sampling at a rate of 12.8 kHz.

Powerful Software: The power quality monitoring device uses a DSP+ARM+CPLD core, ensuring fast processing speed and rich software functionality. This makes the TC-300B suitable for complex testing and data processing tasks, greatly improving testing efficiency and standards.

Communication Interface (RS-232/485, Ethernet Port): The online power quality monitoring device typically uses RS232 to RS485 communication. If Ethernet communication is required, it must be specified separately in the contract. 

Multiple Test Parameters: System frequency, grid harmonics, three-phase voltage unbalance, voltage deviation, fundamental voltage RMS and true RMS, fundamental current RMS and true RMS, active power, reactive power, 2nd to 50th harmonics, true power factor, and other parameters specified in national standards for power quality.

Large Storage Capacity: The online power quality monitoring device comes with 512MB of built-in memory, storing data in 5-minute intervals. Each channel can continuously store historical data for up to three months.

2. Main Functions of Power Quality Monitoring Device TC-300B

It can be widely used in fields such as new energy systems (e.g., photovoltaic power generation, transmission, and distribution), power electronics, and motor drives. It measures and analyzes the AC power quality of public grids supplied to user ends or new energy photovoltaic power generation, including voltage deviation, permissible three-phase voltage unbalance, and grid harmonics.

It uses wavelet transform to measure and analyze harmonics in non-stationary time-varying signals.

It measures and analyzes the impact of various electrical equipment on public grid power quality under different operating conditions.

Load fluctuation monitoring: Periodically records and stores trends of electrical parameters such as voltage, current, active power, reactive power, frequency, and phase.

Dynamic monitoring of power equipment adjustment and operation processes, helping users analyze issues that arise during equipment adjustment and commissioning.

Testing and analysis of fault causes in power systems, such as circuit breaker operations, transformer overheating, motor burnout, and misoperation of automatic devices.

Testing and analysis of dynamic parameters of reactive power compensation and filtering devices in power systems, providing quantitative evaluation of their functionality and technical indicators.

3. Test Ranges and Technical Specifications of Power Quality Monitoring Device TC-300B

Frequency Measurement

Measurement range: 45–55 Hz, center frequency 50 Hz. Measurement condition: The fundamental component of the signal must be no less than 80% F.S.

Measurement error: ≤0.02 Hz

Input voltage range: AC 10–450 V

Input current range: 5 A or 15 A. Other ranges require special specification.

Fundamental voltage and current amplitude: Fundamental voltage error ≤0.5% F.S.; fundamental current error ≤1% F.S.

Measurement error of phase difference between fundamental voltage and current: ≤0.5°

Harmonic voltage ratio measurement error: ≤0.1%

Harmonic current ratio measurement error: ≤0.2%

Three-phase voltage unbalance error: ≤0.2%

Voltage deviation error: ≤0.2%

Power deviation: ≤0.5%