RHF-Active Active Harmonic Filter
The RHF-Active is an active harmonic filter designed to optimize power quality in various applications. It is available in several nominal current ratings, including 15A, 35A, 55A, 100A, and 150A, and operates with a nominal voltage of 380V – 480V (50Hz / 60Hz). The device is suitable for use in marine, oil & gas, water treatment, general industry, and data center environments.
Function Description
The RHF-Active filter module is a drive system with harmonic filter, power feedback units, controller, and other components. It is designed to reduce harmonic distortions in electrical networks, thereby improving power quality and efficiency. The filter operates by injecting a compensating current into the network, which cancels out the harmonic currents generated by non-linear loads. This results in a cleaner sinusoidal current waveform, reducing losses and improving the overall performance of the electrical system.
The RHF-Active can be used in both 3P3W (three-phase, three-wire) and 3P4W (three-phase, four-wire) wiring configurations. It features an LED status display to indicate operation (green), error (red), and standby (flashing green) states. Communication with the device can be established via RS-485 and CAN interfaces, allowing for remote monitoring and control. Current transformers are used to measure the load current, and their selection depends on the application's load current. The device also includes an EPO (Emergency Power Off) connection for safety.
The RHF-Hybrid combines the advantages of active and passive harmonic filters, offering a comprehensive solution for harmonic mitigation. For high loads (>100kW), the RHF-Hybrid system is recommended, which consists of RHF-Active modules combined with RHF-Passive filters. The RHF-Active controls the usage of passive filter circuits, resulting in several important advantages, including low nominal current distortion (typically <1%) and significantly lower total costs.
Important Technical Specifications
The RHF-Active series offers various models with different nominal currents and corresponding electrical data.
General Data (common to all models):
- Mains voltage: 380-480V (+10% / -15%)
- Network type: 3 phase with/without neutral 3P4W/3P3W
- Colour: White
Electrical Data (common to all models):
- Mains frequency: 50Hz / 60Hz (±5Hz)
- Harmonic compensation: 1-60. Harmonics
- Response time: 20µs
- Full response time: 5ms
- Filter performance: ≥96%
- Switching frequency: 40kHz-60kHz, typical 50kHz
- Switching technology: Advanced SiC
- System topology: Two Level Topology
- Function: Harmonic compensation, power factor correction, three phase balancing
User-Interface & Remote Monitoring (common to all models):
- HMI: Not present / extern
- Communication protocol: RS485
- PC-Software: V3.2.3
Efficiency (common to all models):
- η: >98%
- Noise: <60db
- Current transformer ratio: 5/5-10000/5
- Cooling: Forced air cooling
- Air flow requirement: >160m³/h
- Mounting: Wall mount
- Parallel configuration: Unlimited
- Extensions: Modules in parallel
- Protection level: IP20
- Cable entering: bottom
- RFI level: class A
Environmental (common to all models):
- Ambient temperature: -10°C~40°C
- Temperature-Derating: Derating above 40°C (10%/5K)
- Maximum temperature: 50°C
- Relative Humidity: 5%~95% Class C, without condensation below 1000m
- Altitude: above 1000m (5%/1000m to 4000m)
Weight, Dimensions, and Power Loss (model-specific):
-
15A Model:
- Power loss (100% load): 274W
- Weight: 8kg
- Dimensions WDH[mm]: 86260450
-
35A Model:
- Power loss (100% load): 556W
- Weight: 18kg
- Dimensions WDH(mm): 106360560
-
55A Model:
- Power loss (100% load): 833W
- Weight: 18kg
- Dimensions WDH(mm): 106360560
-
100A Model:
- Power loss (100% load): 1283W
- Weight: 32kg
- Dimensions WDH(mm): 97482755
-
150A Model:
- Power loss (100% load): 2120W
- Weight: 32kg
- Dimensions WDH(mm): 97482755
Certifications (common to all models): CE, UL (in progress)
Transport/Storage (common to all models):
- Ambient temperature (Transport): -25°C~+70°C (following DIN EN 50178)
- Ambient temperature (Storage): -25°C~+55°C (following DIN EN 50178)
Usage Features
The RHF-Active is designed for ease of installation and operation. Before commissioning, it is crucial to perform several checks:
- Unpacking: Inspect for intactness and dryness, and ensure all accessories are present.
- Application Suitability: Verify that current transformers and adjusted parameters are suitable for the application.
- Environment Conditions: Ensure the ambient temperature is below 40°C, humidity is within limits, and there is sufficient air flow for cooling.
- Installation:
- Check mounting and wiring of current transformer (CT) and power/control wires.
- Verify grounding of the system and components.
- Ensure clearance between components and proper installation of the module.
- Confirm the EPO connector is equipped with a short circuit wire, as this is mandatory for powering up.
- Wiring: The manual provides detailed diagrams for 3P3W and 3P4W wiring. Correct polarity of current transformers (S1 and S2) is critical for proper function.
- Parallel Wiring: RHF-Active modules can be connected in parallel to achieve higher power ratings. The manual provides examples for parallel wiring of two or more RHF-Active units.
- Current Transformer Selection and Modification: The selection of current transformers depends on the load current. The software adjustment must be in accordance with the marked direction on the transformer match.
- Input and Output Interface: The device includes various terminals for relay outputs (NO2, COM, NO1) and DC inputs (GND_O, 1N1, 1N2).
- Supervision and Control Software: The RHF-Active Configuration V3.2.7 software is used for connection to a PC, allowing for parameter checks and adjustments. The software can be downloaded from www.revcon.de.
Safety Precautions:
The manual emphasizes several safety precautions:
- Only qualified personnel should install, operate, and service the RHF-Active Filter.
- Observe specified mains voltage and ensure proper grounding.
- Use screened/twisted control wires and connect screens to PE at both ends.
- Ensure good grounding of drive, motor, and filter module.
- Observe star layout for grounding of cabinets and systems.
- The filter module is designed for fixed mounting and electrical connection. The ground wire must have a minimum cross section of 2.5mm².
- After switching off the mains supply, all terminals may stay live for up to fifteen minutes. Before touching, verify that no voltage is present.
- Failure to comply with safety instructions may result in death or serious injury.
Maintenance Features
Predictive maintenance of the RHF-Active involves regular checks to ensure optimal performance and longevity. The recommended maintenance is listed below:
-
Environment Conditions:
- Check of ambient temperature, humidity, vibrations and for absence of dust, gas, oil mist and water drops: Optical check and measurement of parameters.
- Ensure that no tools or other potentially dangerous components have been placed nearby: Optical check.
-
Voltage:
- Measure voltage in power and control circuits: Measurement with multimeter.
-
Supply Lines:
- Check for loosen screws: Check for loosen screws.
- Check of system and cabinet: Check of absence of sparks, damages, dark colour due to overheating or aging of isolation. Ensure that no dust or dirt is present.
-
Cooling System:
- Fan:
- Check for abnormal sound emission or vibrations: Optical check or estimation of operation time based on maintenance files.
- Check for loosen screws: Fix screws.
- Check of absence of dark colour due to overheating or aging: Optical check or estimation of operation time based on maintenance files.
- Air duct:
- Check for debris in the cooling system: Optical check.
Error Description and Repair:
The manual provides a table for common errors, their causes, and suggested repair actions:
- RHF-Active wrong compensation (THDI rises):
- Cause: Current transformer, System settings.
- Repair: Check wiring and polarity, Check transformer ratio.
- RHF-Active insufficient compensation (THDI decreases but is higher than expected):
- Cause: Phase angle, Low impedance.
- Repair: Setting the phase angle compensation with patience and carefully step by step. Trial and error iteration. Low impedance of the connection result in very harmonic levels before compensation. It is highly recommended to install impedance as first counter measurement against harmonics (for Drives basically DC or AC chokes).
- Error signal (red LED):
- Cause: System settings.
- Repair: Observe chapter 5.3.9. Check for first error than for second.
- No communication:
- Cause: Software settings.
- Repair: Improve baud rate and/or interface selection.
Further possible alerts and troubleshooting can be found in the RHF-Active commissioning guide.
Need help?
General
To Next Page