Type-tested, custom-manufactured distribution transformers, detuned reactor banks, and harmonic mitigation units certified to IEEE 519, IEC 60076, and EVN Circular 39 standards.
High-reliability 6.3kV to 110V single-phase distribution transformer engineered with low-loss core steel for rural grid stabilization and localized harmonic suppression.
Heavy-duty three-phase step-down power transformer featuring enhanced dielectric oil cooling, ideal for non-linear motor drive filtering in Hanoi factory clusters.
Compact outdoor pad-mounted transformer designed with Dyn11 vector group, suppressing 3rd and triple-N harmonics in high-density commercial complexes.
Energy-saving hermetically sealed distribution transformer optimized for low total harmonic distortion (THD) and thermal protection under continuous non-linear load conditions.
Customizable medium-voltage distribution transformer with multi-tap changer settings, engineered for integration with passive harmonic filter (PHF) banks.
Flexible voltage matching unit designed for specialized industrial machinery, high-frequency VFD drive isolation, and active harmonic filter integration.
Engineered for 20kV power distribution networks in Northern Vietnam, offering low core heating and exceptional resilience against high-order voltage harmonics.
Pole-mounted distribution transformer with reinforced winding insulation to handle high harmonic current distortion in commercial and suburban feeder lines.
The Greater Hanoi Metropolitan Area—encompassing major industrial hubs such as Thang Long Industrial Park, Quang Minh Industrial Zone, Sai Dong B, and the surrounding manufacturing belts of Bac Ninh and Hung Yen—is experiencing unprecedented industrial automation growth. However, the widespread deployment of non-linear electrical loads, including Variable Frequency Drives (VFDs), active front-end rectifiers, uninterrupted power supplies (UPS), and induction heating furnaces, has introduced severe harmonic distortion into the medium-voltage (22kV / 35kV) power distribution network operated by EVN Hanoi (Electricity of Vietnam Hanoi Power Corporation).
Harmonic currents ($I_3, I_5, I_7, I_{11}, I_{13}$) injected back into the utility grid lead to transformer core overheating, premature dielectric insulation breakdown, nuisance circuit breaker tripping, and excessive voltage distortion ($THD_v$). To protect utility infrastructure, EVN enforces strict power quality mandates regulated under **Circular No. 39/2015/TT-BCT** issued by the Vietnam Ministry of Industry and Trade (MOIT).
As a leading global transformer and power quality equipment manufacturer established in 1994, our engineering division delivers tailor-made Active Harmonic Filters (AHF), Passive Tuned Filter (PHF) Banks, and K-Factor Isolation Transformers specifically engineered to assist industrial plant managers and EPC contractors across Hanoi in achieving flawless grid compliance and operational longevity.
To optimize financial investment while eliminating dynamic electrical noise, factory operators in Hanoi must select the correct power quality architecture based on their load profiles, THDi levels, and resonance dynamics.
| Parameter / Feature | Active Harmonic Filters (AHF) | Passive Harmonic Filters (PHF) | K-Factor & Phase-Shifting Transformers |
|---|---|---|---|
| Operating Principle | Real-time counter-phase current injection via high-speed IGBT inverter. | L-C tuned resonant tank tuned to specific harmonic orders (e.g., 5th, 7th). | Cancels zero-sequence and triple-N harmonics via phase flux displacement. |
| Filtering Efficiency | Reduces $THD_i$ from >40% down to <3% across 2nd to 50th orders. | Targeted mitigation ($THD_i$ reduced to <8-10% at nominal design load). | Handles non-linear heating; phase-shifting cancels 5th & 7th harmonics. |
| Response Time | Instantaneous (< 21 microseconds / < 0.5 cycle). | Static / Slow (tied to contactor switching cycles). | Continuous passive magnetic compensation. |
| Grid Resonance Risk | Zero risk of resonance; active impedance tracking. | Moderate risk if grid background impedance shifts. Requires detuned reactors. | Zero risk; operates purely as an inductive electromagnetic interface. |
| Best Local Application | Precision electronics, semiconductor lines, CNC parks in Bac Ninh & Hanoi. | Constant-load water pumping, large air blowers, continuous processing plants. | Commercial high-rises, IT data centers, heavy industrial step-down stations. |
For complex installations with rapidly fluctuating dynamic loads (e.g., automated welding robots in automotive assembly lines), Active Harmonic Filters (AHF) inject equal and opposite harmonic compensation currents in real time. Conversely, for large steady-state motor loads, Passive Detuned Harmonic Filters combined with our CPRI-tested distribution transformers provide an exceptionally robust and cost-effective capital expenditure option.
Delivering customized power quality engineering across key economic sectors in Northern Vietnam's core industrial corridors.
Facilities producing sensitive printed circuit boards (PCBs), mobile components, and optics (e.g., suppliers in Thang Long IP and Quang Minh IP) require pristine sine wave power. Micro-voltage sags and high-frequency harmonic noise cause production line recalibrations and high component scrap rates.
Solution: Multi-stage Active Harmonic Filters paired with K-20 rated Dry-Type Transformers to ensure THDv < 2%.
Automotive manufacturing hubs in Northern Vietnam operate heavy robotic welding apparatus, 6-pulse and 12-pulse VFD conveyor belts, and electric arc furnaces. These non-linear loads induce severe 5th, 7th, 11th, and 13th order harmonic currents.
Solution: Hybrid Active/Passive Filtering Banks with 5000kVA 33kV ONAN Oil-Cooled Transformers to handle severe thermal stresses.
Hanoi's rapidly growing financial districts (Cau Giay, Nam Tu Liem) house major cloud data centers and high-rise commercial complexes. Large switch-mode power supplies (SMPS) generate massive 3rd order triplen harmonics ($I_3$) that overload neutral conductors.
Solution: Zero-Phase Sequence Triplen Harmonic Filters and Dyn11/Dyn1 Star-Delta Phase-Shifting Transformers.
Since 1994, our manufacturing facility has operated at the forefront of transformer design and power quality engineering. Certified under **ISO 9001:2015**, we provide fully integrated design, core cutting, coil winding, vacuum pressure impregnation (VPI), and stringent quality testing under one roof.
Our power and distribution transformers up to 5000 kVA 33kV are type-tested at the Central Power Research Institute (CPRI), verifying short-circuit withstand performance and temperature rise compliance under full harmonic loading.
We build tailored electromagnetic solutions including multi-winding phase-shifting transformers (24-pulse/48-pulse converter duty), ONAN/ONAF oil-immersed units, and VPI dry-type filters engineered to exact customer specifications.
We provide full technical support for Hanoi buyers, including pre-installation grid harmonic audits, site commissioning support, rapid spare parts availability, and strict compliance documentation for EVN inspectors.
Vietnam's newly enacted **Power Development Plan VIII (PDP8)** emphasizes rapid integration of renewable energy sources, grid modernization, and industrial energy efficiency. For manufacturing enterprises operating in Northern Vietnam, this transition introduces two major power quality factors:
1. Increased Inverter Density in Industrial Rooftop Solar PV Systems: Millions of square meters of factory roofs across Hanoi and adjacent industrial parks are now equipped with grid-tied solar inverters. High concentrations of solar inverters inject high-order switching harmonics (2kHz - 9kHz range) into local distribution transformers, necessitating advanced detuned filtering and broadband harmonic suppression.
2. EV Charging Infrastructure Expansion in Greater Hanoi: As fast DC charging networks expand rapidly across Hanoi's urban and suburban expressways, the extreme non-linear power draw from high-power IGBT rectifiers imposes severe harmonic stress on local 22kV substations. Installing active harmonic filtering at EV charging hubs has become a prerequisite for EVN grid interconnect approval.
Direct technical answers addressing EVN grid compliance, transformer selection, ambient climate resilience, and order fulfillment.
Our active and passive harmonic filter systems are custom-engineered to measure and suppress harmonic distortion at the point of common coupling (PCC). By combining correctly tuned detuned reactors with low-impedance copper winding distribution transformers, we reduce total current harmonic distortion ($THD_i$) to under 3-5%, guaranteeing compliance with EVN's 6.5% $THD_v$ grid threshold and eliminating utility penalty surcharges.
Standard transformers experience excessive eddy current losses and stray load losses when subjected to harmonic currents, leading to overheating and premature insulation failure. Our K-Factor rated transformers (K-4, K-13, K-20) are designed with double-sized neutral conductors, electrostatic shielding between primary/secondary windings, and optimized core geometry to safely handle non-linear heat stresses without derating.
Hanoi experiences high summer temperatures (>40°C) combined with humidity levels exceeding 85-90%. All our oil-immersed transformers utilize high-flashpoint dielectric oils with anti-oxidation inhibitors, tropicalized anti-corrosion paint systems (C4/C5 rated coating), and sealed corrugated tanks. Dry-type units are vacuum pressure impregnated (VPI) with Class H epoxy insulation to resist moisture ingress and thermal degradation.
Yes. We specialize in custom dimensional engineering. Whether replacing an old unit in a dense indoor substation in downtown Hanoi or retrofitting an existing outdoor pad in an industrial park, our engineering team provides customized busbar entry layouts, top/bottom cable entry boxes, and compact footprint designs to fit your exact site dimensions.
Every transformer and filtering unit undergoes comprehensive routine testing in accordance with IS 2026 / IEC 60076 prior to dispatch. Test reports provided include Winding Resistance Tests, Voltage Ratio & Vector Group Verification, Impedance Voltage & Load Loss Measurements, No-Load Loss & Current Tests, Separate Source Voltage Withstand, and Induced Overvoltage Withstand Tests. Full CPRI Type Test Certificates are supplied upon request.
Standard distribution transformers (up to 1000 kVA) have a manufacturing lead time of 2 to 3 weeks. Custom power transformers up to 5000 kVA 33kV with specialized active/passive harmonic filter assemblies typically ship within 4 to 6 weeks. Fast-track production lines are available for urgent factory expansion or emergency grid replacement projects in Northern Vietnam.
Speak directly with our senior power quality application engineers. We provide comprehensive load studies, harmonic spectrum analysis, and competitive factory-direct quotations tailored for your project in Hanoi and across Vietnam.