Power Quality Components
Your Leading Power Quality Components Supplier
LTEC is one of your best partners in power quality. Our power quality engineering team designs specialized power quality components and systems, such as filters and reactors, to enhance your power quality management. We provide a wide range of power quality components, including active and passive harmonic filters, sine wave filters, air core reactors, PFC controllers, shunt reactors, power capacitors, thyristor switches, etc.
Why choose us?
Our factory
Our primary production plant in Kunshan city spans an area of 20,000 square metres, situated one hour's drive away from the Shanghai Airport (PVG). We have about 120 patents related to our products.
Sales market
Our products have been exported to the United States, Germany, the United Kingdom, Israel, Australia, and more than 60 countries and regions around the world.
Custom service
We provide our customers with world-class LV and HV products, along with reliable technology and friendly, flexible customer support. Additionally, we develop "tailor-made" products and solutions tailored to your applications.
Our certificate
We deliver top-quality products that meet international standards such as UL, TUV, CE, EAC, and GOST. Our ISO9001 certification for quality management supports our commitment to excellence.
Types of Air Core Reactors
Dry type with air core
Air-core dry-type reactors are most commonly found in electric power transmission and distribution systems, as well as electrical plant power systems for a variety of purposes. It can be employed as the inductive component of tuned harmonic filters, for fault current limiting, power flow regulation, reactive compensation (shunt reactors), and other purposes.
Dry type with iron core
Iron core reactors feature a core that saturates when design current levels are surpassed. These reactors have a low partial discharge, a high mechanical strength, a small volume, a low noise level, and a low loss. They are frequently utilized in power transmission and conversion systems, electrified trains, metallurgy, and the petrochemical industries. It is specifically utilized in underground substations with constrained installation space and unique fire protection needs, urban power grid substations, microcomputer-controlled stations with unique electromagnetic interference requirements, and substations in subterranean power grids.
Oil-immersed type
Air core shunt reactors are manufactured in an oil-immersed design. The oil-immersed air core reactor becomes the favored form of coupling reactor due to its low electromagnetic interference and excellent insulation strength. It primarily consists of a reactor body and an oil tank.
Current limiting
Air core current limiting reactors are one of the most effective short-circuit current limiting technologies. It lessens the strain on buses, insulators, circuit breakers, and other high-voltage equipment. Air core current limiting reactors are a cost-effective and practical method of restricting current. Reactors that limit current are produced up to 420 kV. These reactors are built to resist the rated current and fault currents for an extended length of time.
Power flow control
Air core power flow control reactors allow users to regulate the current in two or more parallel circuits. These reactors are linked in series in a power system (often a transmission line) to maximize power flow by changing the transfer impedance. They modify the line impedance so that the load flow can be managed, guaranteeing maximum power transfer over nearby transmission lines.
Capacitor switching
A capacitor-switching reactor is an air-core reactor that is designed to be used with capacitor banks. It is used to reduce harmful surge transients during the switching of the capacitor banks on and off.
Harmonic filtering
Harmonic filter reactors, in conjunction with capacitor units and, on occasion, resistors, construct a filter circuit set to a certain frequency (resonance frequency) to minimize, block, or provide a low-impedance channel for harmonic currents in the audio frequency range. They are linked in either a parallel or a series manner. The reactors are built to fulfill particular design criteria such as quality factors and tolerance of inductance between phases, as well as the reactor itself.
Reactive power compensation
Reactive power compensation is becoming increasingly important in the industrial sector to cut energy expenses. Air-core reactors are widely used nowadays because of their low cost and simple maintenance. Air-core reactive power compensation reactors employ capacitor banks that are linked in series to transmission lines. It enhances voltage control and system transient stability, resulting in increased transmission line capacity, lower electrical losses, and cost savings.
HVDC smoothing
Smoothing reactors are used in DC systems to minimize harmonic currents and transient overcurrents. They are utilized in High Voltage Direct Current (HVDC) connections as well as industrial applications like rectifiers and traction systems. Smoothing reactors help minimize the occurrence of alternation failure in inverters induced by voltage dips at the converter bus. DC filters are located on the line side of the HVDC smoothing reactor in shunt with the DC line, and their job is to lower harmonic currents on the DC line even more.
Others
Several other applications of air core reactors include neutral-earthing, static var compensation (SVC), arc-furnace series reactors, motor starting, test laboratory reactors, electric arc furnace reactors, line & load reactors, test lab reactors, PLC line traps, and others.
Superior efficiency: Air core reactors minimize energy losses due to the absence of core saturation, a common issue with iron core reactors. This translates to cost savings and a greener operation.
Enhanced power quality: By mitigating harmonic distortions, air core reactors ensure a cleaner and more stable power supply. This protects sensitive equipment and improves overall system performance.
Fast response: The air core design allows for a quicker response to current fluctuations, safeguarding your electrical systems from transient voltage spikes.
Lightweight and compact: Compared to iron core reactors, air core reactors are lighter and more compact, making them ideal for space-constrained environments.
Linear operation: Air core reactors exhibit a linear relationship between current and inductance, ensuring predictable performance across various operating conditions.
Wide range of applications: These versatile reactors cater to diverse industrial needs, including: Power factor correction, current limiting, harmonic filtering, neutral grounding, and renewable energy integration.
Product Parameters
|
Parameter Category |
Technical Specifications |
Remarks |
|
Electrical Parameters |
||
|
- Rated Voltage |
Up to 35kV |
Select based on the system voltage level |
|
- Rated Current |
10A~5000A (customizable) |
Must match the actual load current |
|
- Inductance (L) |
0.1mH~100mH (±5% tolerance) |
Constant in linear range, no saturation |
|
- Frequency Range |
50/60Hz (power) or 1kHz~1MHz (HF) |
Power frequency for grids, high frequency for RF/telecom |
|
- Temperature Rise |
≤65K (per IEC 60076-6) |
Tested at 40°C ambient temperature |
|
Mechanical Parameters |
||
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- Winding Material |
Aluminum/Copper (epoxy encapsulated) |
Aluminum for lightweight, copper for better conductivity |
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- Cooling Method |
Natural (AN) / Forced Air (AF) |
High-capacity models require forced cooling |
|
- Protection Class |
IP00~IP54 (indoor/outdoor) |
Outdoor models need dust/water resistance |
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- Mounting Orientation |
Vertical/Horizontal |
Avoid mechanical resonance |
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Performance Metrics |
||
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- Overload Capacity |
2~3× rated current (1s duration) |
Withstands short-circuit current surges |
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- Linearity |
>99% (within rated current) |
Minimal inductance deviation |
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- Losses |
<0.3% of rated capacity (no core loss) |
Significantly lower than iron-core reactors |
|
Standards & Certifications |
IEC 60289 / IEEE C57.16 |
International Electrotechnical Commission & IEEE standards |
|
Environmental Conditions |
-25°C~+55°C (outdoor: -40°C~+70°C) |
|
Types of Active Harmonic Filter
Active current source filter
This type of active filter is used to correct the power factor and compensate harmonic currents in a specific load. It works by injecting a compensation current in parallel with the load, which helps to reduce harmonic distortion and improve the power factor.
Voltage source active filters
This type of active filter is used to improve the quality of the electrical voltage supplied by the power grid. It works by injecting a compensation voltage in series with the load, which helps to reduce harmonic distortion and voltage fluctuations.
Series active filter
This type of active filter is used to mitigate harmonics and other voltage fluctuations in a specific load. It works by injecting a compensation voltage in series with the load, which helps to reduce harmonic distortion and improve electrical voltage quality.
Shunt active filter
This type of active filter is used to mitigate harmonics and other voltage fluctuations throughout the electrical network. It works by injecting a compensating current in parallel with the power grid, which helps to reduce harmonics and other voltage fluctuations.
Adaptive active filters
These filters use a control algorithm that can adapt to changes in harmonic distortion in the power system, allowing more efficient and accurate filtering of harmonic frequencies.
In general, active harmonic filters are classified according to the type of converter used and the control algorithm. The choice of an active harmonic filter will depend on the specific application and the type of harmonic distortion present in the power system.
Benefits of Installing an Active Harmonic Filter
Harmonic mitigation: The primary advantage of using active harmonic filters is their ability to effectively mitigate harmonic distortions in the electrical system. By eliminating harmonics, the AHF prevents issues such as voltage distortion, tripping of protective devices, and interference with sensitive equipment, thereby improving the overall power quality.
Improved power factor: AHF contributes towards improving the power factor of the electrical system. They ensure that the reactive power is automatically compensated, which results in a higher power factor. A higher power factor means reduced energy consumption, leading to cost savings and increased energy efficiency.
Equipment protection: Non-linear loads and harmonic distortions can cause excessive heating and premature wear of electrical equipment, leading to costly downtime and maintenance. Active harmonic filters safeguard equipment by maintaining clean power and preventing excessive stresses due to harmonics.
Compliance with standards: Many countries and industrial standards have stringent regulations regarding harmonic levels in electrical systems. By installing AHF, users can ensure compliance with these standards and avoid potential penalties.
Energy saving: By reducing harmonic distortions and improving the power factor, AHF contributes to saving energy. The optimised power factor reduces overall energy losses, resulting in reduced electricity bills and increased operational efficiency.
Increased system reliability: Active harmonic filters enhance the overall reliability and stability of the electrical system. By eliminating harmful harmonic currents, they reduce the risk of voltage fluctuations, equipment failures, and potential system malfunctions.
Easy installation and integration: Active harmonic filters are designed for easy installation and integration into existing electrical systems. They can be installed in parallel to the non-linear loads, and their control systems automatically adjust to varying load conditions, making them user-friendly and efficient.
Longer equipment lifespan: With improved power quality and reduced stresses on electrical equipment, the lifespan of sensitive and expensive devices, such as motors and transformers, is extended, leading to reduced maintenance and replacement costs.
Industrial facilities
Manufacturing plants, especially those with variable speed drives and other nonlinear loads, benefit significantly from active harmonic filters. They ensure the reliability of machinery, reduce maintenance costs, and improve overall system efficiency.
Data centres
Data centres rely on an uninterrupted power supply. Active harmonic filters play a crucial role in maintaining power quality, reducing the risk of data loss, and ensuring the longevity of IT equipment.
Commercial buildings
In office complexes, retail spaces, and hospitals, active harmonic filters help maintain a stable power supply, ensuring that HVAC systems, elevators, and sensitive medical equipment operate smoothly.
Renewable energy installations
Wind and solar farms can generate harmonics due to the variability of their power output. Active harmonic filters are used to ensure the clean injection of power into the grid, preventing disturbances and ensuring grid stability.
Wastewater treatment plants
In these facilities, pumps, blowers, and various process equipment introduce harmonics. Active harmonic filters help in maintaining efficient operation and reducing energy consumption.
Product Parameters
|
Category |
Parameter |
Specification |
|
Product Type |
Function |
Active harmonic filter for reduction of harmonic distortion from VFDs and non-linear loads |
|
|
Technology |
IGBT unit control (up to 50th harmonics) |
|
Topology |
IGBT Technology |
High-speed 5 IGBT in TRENCHSTOP™5 with RAPID anti-parallel diode |
|
Electrical Parameters |
Supply Voltage |
3-phase 208V - 400V - 480V - 690V (±20%) |
|
|
Frequency |
50Hz / 60Hz (±10%) |
|
|
Rated Current (compensation) |
30A - 50A - 75A - 100A - 150A |
|
Compensation Capability |
Harmonic Mitigation |
2nd to 50th order |
|
|
Power Factor Correction |
Yes |
|
|
Imbalance Compensation |
Yes |
|
Performance |
CT Accuracy |
0.5 or higher |
|
|
Active Loss |
< 2.5% |
|
|
Efficiency |
> 97.5% |
|
Environmental |
Operating Temperature |
-10°C to +40°C |
|
|
Humidity |
5% to 95% (non-condensing) |
|
|
Altitude |
< 2000m (derating: 5%/1000m above 1000m, up to 4000m) |
|
Standards |
Compliance |
IEEE 519, IEC 62477 |
|
Protection & Safety |
Protection Level (Standard) |
Module: IP20, Electronics: IP42 |
|
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Customizable Protection |
IP54 available |
|
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Anti-Pollution Level (Standard) |
Level 2 (Level 3 customizable) |
Shipping term: FOB SHANGHAI
Delivery time: 4-6 weeks after we receive your payment.
Payment term: The advance payment is 100%, all by T/T.
Price validity: One month
Warranty: 18 months after delivery (excluding natural disasters, human factors, improper use, etc.)
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