Description
Overview of Power Quality Monitors
- As a premier choice among professional Power Quality Monitors, the APQ-9100H serves as a core device for comprehensive electric power quality management. Powered by an advanced 32-bit ARM processor, this unit seamlessly integrates high-speed sampling, calculation, analysis, and communication to ensure the delivery of stable and quality power.
- As a professional Power Quality Monitor among Power Quality Products, it delivers real-time monitoring of critical grid parameters for Power of Quality assessment, including harmonic content up to the 63rd order, total harmonic distortion (THD), three-phase voltage unbalance, flicker and frequency. It also tracks active and reactive power of each harmonic, true and displacement power factors, true RMS and sequence components, offering a comprehensive overview of power grid operating status.
Power Quality Monitoring Scope
- From the perspective of power supply, power quality refers to the degree of compliance of power supply parameters with relevant standards as well as power supply reliability.
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From the perspective of electrical equipment manufacturers, power quality represents the electrical performance characteristics required for normal equipment operation.
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From the user perspective, power quality refers to abnormal fluctuations in supply voltage, current and frequency that may lead to electrical equipment malfunction, failure or outage.
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Power quality measurement serves to quantify such performance, while a power quality logger and power quality recorder continuously capture and store on-site operational data.
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Power quality characterizes the overall grade of electric energy, mainly consisting of voltage quality and frequency quality.
Features of Power Quality Monitoring Equipment
Basic Measurement Quantities
- Grid frequency; RMS voltage and current; total active power, reactive power and power factor.
Basic Monitoring Indicators
- RMS value of three-phase fundamental voltage and current, fundamental power, power factor, phase angle, etc.
- Voltage deviation
- Frequency deviation
- Three-phase voltage unbalance degree, three-phase current unbalance degree, negative-sequence voltage and current
- Harmonics (2nd～63rd order): including total harmonic distortion rate of voltage and current, individual harmonic ratio, amplitude and phase; active power and reactive power of each harmonic order.
Advanced Monitoring Indicators
- Inter-harmonics
- Voltage fluctuation and flicker
- Voltage swell, voltage sag and short-time interruption
Setting Functions
- Power quality monitoring devices support configuration of the device hardware clock, as well as configuration, modification and viewing of monitoring parameters. Password protection is also provided for authority management.
Recording and Storage Function
- The device can save basic and advanced monitoring indicators in real time. The statistical time interval is configurable.
3-minute data (storing one of the maximum value, minimum value, average value, and 95% probability maximum value) can be retained on the device for more than one year, and will be updated automatically on a first-in, first-out basis afterwards.
Statistical Function
- Power quality meters are equipped with an online statistical function for major monitoring indicators, capable of calculating their maximum value, minimum value, average value and 95% probability maximum value within a specified time period.
Communication Function
- The device is provided with multiple communication interface modes to realize real-time transmission of monitoring data or regular retrieval of stored records. It can communicate with the remote power quality management center via the industrial Ethernet interface, and also support remote communication through the RS232 interface by Modem or GPRS mode.
GPS Time Synchronization Function
- The device is equipped with a hardware GPS time synchronization interface, which can receive IRIG-B code time synchronization or second pulse time synchronization signals to keep the clock consistent with the remote management center.
Event-triggered Wave Recording Function
- Event trigger conditions (manual or automatic) can be set as required. The device records and stores real-time data before and after event triggering, and saves event logs for inquiry.
Current Signal Input
- Input mode: Current transformer input
- Input mode: Current transformer input
- Rated current In: 5A/1A
- Measuring range: AC 200mA～5A or AC 50mA～1A
- Power consumption: ≤0.5VA per channel
- Overload capability:
- 1.2In for continuous operation
- 2In for 1 second permissible duration
Voltage Signal Input
- Input mode: Voltage transformer input
- Rated voltage Un: 57.7V/100V
- (400V voltage version shall be specified when ordering)
- Measuring range: AC 0.5V～120V
- Power consumption: ≤0.5VA per channel
- Overload capability:
- 1.3Un for continuous operation
- 1.4Un for 1 second permissible duration
- Input impedance: ＞100kΩ
Digital Input
- Operating voltage: AC 220V / DC 30V
- Input type: Dry contact or active contact
- Isolation mode: Optoelectronic isolation, isolation voltage 2500V
Accuracy of Monitoring Indicators
- Voltage & Current: 0.2%
- Power & Power Factor: 0.5%
- Frequency Deviation: 0.01Hz
- Voltage Deviation: 0.2%
- Three-phase Voltage Unbalance: 0.2%
- Three-phase Current Unbalance: 0.1%
- Harmonics: Complies with Class A requirements in Appendix D of GB/T 14549-1993
- Inter-harmonics: Refer to Class A requirements for harmonics in Appendix D of GB/T 14549-1993
Flicker: 5% - Voltage Fluctuation: 5%
Power quality monitoring system
The Importance of Power Quality Management
- Power quality management ensures the safe and efficient operation of power systems and electrical equipment by monitoring and addressing indicators such as voltage deviation, harmonics, flicker, and three-phase imbalance. It reduces energy losses, extends equipment lifespan, and meets national standards.
- Power quality engineers analyze data collected by power quality analyzers, identify the root causes of power quality issues according to specific application scenarios, and deliver professional evaluation and analysis to formulate targeted power quality solutions for stable grid operation.
Installation Dimensions
FAQ
Q：What is the difference between a power quality monitor and a relay protection device?
A:Power quality monitors focus on the long-term online monitoring, recording, and diagnostic analysis of power grid operational quality indicators (such as harmonics, voltage deviation, flicker, and three-phase imbalance), serving as a “health check” tool;
In contrast, relay protection rapidly detects faults such as short circuits and overcurrent in the system and triggers circuit breakers to trip and isolate the fault, functioning as an “emergency response” device—the former emphasizes continuous monitoring and analysis, while the latter emphasizes rapid tripping and isolation.
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