Rail Transit 150A 400V Active Harmonic Filter AHF Cabinet for Subway Traction Rectifiers

ND-AHF-150-400-C is a floor standing cabinet rated 150 A at 400 V AC (3P3W) built for rail transit systems. It removes harmonic current at the point where the non-linear load connects, so the distortion stops at the source instead of spreading through upstream switchgear, transformers and generators.

Traction rectifiers and station inverters inject harmonics that must stay clear of signalling circuits, so selective order control is written into the specification.

The unit measures the load current continuously and injects an equal and opposite compensation current, so the grid current returns to a near sinusoidal shape while the load keeps running unchanged. Reactive power compensation and three-phase unbalance correction can be enabled on the same hardware, which means one Active Harmonic Filter AHF can replace a combination of capacitor banks, detuned reactors and balancing equipment.

Main technical characteristics of this 150 A 400 V Active Harmonic Filter AHF:

• 2nd to 50th Harmonic Selection
  Individual harmonic orders can be enabled or blocked, so only the orders that actually exist in the network are compensated.
• Fast Dynamic Tracking
  Detection happens within microseconds, so compensation follows welding, crane and press loads that change cycle by cycle.
• Complete Internal Protection Chain
  Over-voltage, under-voltage, over-current, over-temperature, phase-loss and short-circuit protection act without external relays.
• Modular Plug-in Architecture
  Power modules slide in and out for maintenance, cutting mean time to repair during planned shutdowns.
• Industrial Control Chip with 16-bit AD
  A 16-bit analog front end keeps the compensation current accurate even when the load current carries steep, high-order distortion.
• Wide Ambient Envelope
  Operation from -25 to +60 degrees C with high humidity tolerance; derating applies only above 2000 m altitude.
• Front-Access Service Design
  Terminals, fans and modules are reachable from the front, so maintenance does not need side clearance.
• RS485 Modbus Reporting
  Standard Modbus-RTU output lets the filter report into a BMS, SCADA or energy management platform.

This Active Harmonic Filter AHF is normally installed on the following loads:

• Subway traction rectifier stations
• Station power and signalling boards
• Tunnel ventilation fan drives
• Depot and workshop test lines
• Platform screen door power supplies

Reasons buyers select our Active Harmonic Filter AHF for projects in rail transit systems:

• Documented Certification
  Products carry CE, IEC, RoHS and ISO 9001 documentation that can be attached to tender submissions and customs files.
• Full-Load Aging before Packing
  Every Active Harmonic Filter AHF runs a 24-hour full-load aging cycle and is inspected against its test record before shipment.
• Selection and Survey Support
  Our engineers review your harmonic measurement, calculate the required compensation current and issue a written selection report before you place an order.
• Export Track Record
  We work with energy engineering distributors across Southeast Asia, the Middle East, Europe, America and Africa, with core cooperation in India, Germany and Saudi Arabia.
• One-Stop Power Quality Supply
  AHF, SVG, intelligent capacitors, reactors and controllers come from the same factory, so interfaces and protocols match across the whole compensation room.

Typical configuration of model ND-AHF-150-400-C. Voltage class, current rating, CT ratio and enclosure can be adapted to your single line diagram.

Common questions about this Active Harmonic Filter AHF from project engineers and distributors:

Nengdu New Energy is a Shanghai based high-tech manufacturer focused on integrated research, production, sales and after-sales service of power quality improvement equipment. The product line covers AHF active filters, SVG static var generators, intelligent capacitors, reactive power controllers, capacitor contactors, voltage adjusters, smart composite switches, dynamic reactive regulators and matching energy storage systems.

Standardised production workshops, dedicated R and D laboratories and a full-function testing workshop support in-house development of every algorithm, software, hardware platform and cabinet structure. Customised power equipment and complete turnkey solutions are supplied, and ODM cooperation is available for partners who need their own branding.

Products hold CE, IEC, RoHS and ISO certification. Long-term partnerships with energy engineering distributors span Southeast Asia, the Middle East, Europe, America and Africa, with core cooperation in India, Germany and Saudi Arabia. Our engineering team provides on-site power quality testing and calculation, equipment replacement matching, programming and commissioning guidance, plus permanent remote after-sales assistance.

• Technical Support
  Lifetime free remote technical support for commissioning, troubleshooting and parameter configuration by video call, WhatsApp or email.
• Training Materials
  Complete operation manuals, wiring diagrams and parameter explanations are supplied so your engineers can run the unit independently.
• On-Site Service
  Where overseas on-site commissioning is required, engineers can be dispatched abroad; travel and service fees are quoted separately.
• Warranty
  A limited warranty applies, with the specific period and terms confirmed in the project contract.
• Response Time
  After-sales and technical enquiries are answered within 24 working hours.
• Spare Parts Supply
  After the warranty period, spare parts are supplied at reasonable cost for the full service life of the equipment.

Send us your single line diagram, harmonic measurement or load list, and our engineers will calculate the required compensation current and confirm the matching Active Harmonic Filter AHF model for your site. Typical response time is within 24 working hours.