Feasibility study of an active system for transformer noise abatement

Feasibility study of an active system for transformer noise abatement by Dean Yannucci Download PDF EPUB FB2

The feasibility of noise abatement of medium power transformers by means of a novel concept for active sound suppression is presented. Noise abatement was accomplished by destructive interference of sound pressure fluctuations in three narrow frequency bands centered at, and Hz.

The project included the design and construction of a model transformer; design, fabrication, Cited by: 1. Noise characteristic is an important factor need to be considered in the noise control process of power transformers.

A transformer noise test platform is constructed in a semi-anechoic room. Lab VIEW is used to design an on-line monitoring and active transformer noise control software system to display and analyze the noise sound pressure level as well as program the LMS algorithm.

Finally, the experiment combining the software system with the hardware devices verifies the feasibility of LMS algorithm in active transformer noise. In addition, a study on Feasibility study of an active system for transformer noise abatement book noise cancellation in a transformer using the FXLMS algorithm was conducted to develop a system that is capable of multiple-sound/channel control, which resulted in the active noise reduction effect when applied on the by: 4.

As a feasibility study, experiments were performed on an acrylic plate with magneto-active boundary profiles. The motion was produced by a series of electromagnets placed along the rubber profiles.

Several types of mechanical boundary conditions were used and, for each case, the vibration response under rectangular input signal was by:   With parameter studies, the feasibility of applying the transformer algorithm with an internally synthesized reference signal to practical transformer noise control is verified by both numerical simulations and experiments.

Previous work has demonstrated that active noise control (ANC) is an effective method to reduce transformer noise. The transformer is sometimes placed inside a building with one opening, and the. Understanding Transformer Noise Transformer Noise intervals along the imaginary string.

The measurements are totaled and then averaged. The result is the transformer noise level. To measure amounts of noise in each frequency range you need a frequency analyzer.

This is a worthwhile acquisi-tion. It is always necessary to measure the. Light System Runway Lead-In Light System (RLLS) • Sequence of Lead-In (LDIN) Light arrays • Used for challenging terrain separation, urban deconfliction and noise abatement Benefits • FAA can consider approach light credit with an RLLS, if applicable to procedure • Can be used with by all pilot skill level • Creates positive course.

Feasibility study of structural batteries emissions and noise. The development of the electric vehicle market over the past five years is illustrated in Figure 1.

The increased BEV market over the last five years period suggests continuous future To meet the aim of assembling three cells in series, the implementation of the control system. In addition, a study on active noise cancellation in a transformer using the FXLMS algorithm was conducted to develop a system that is capable of multiple-sound/channel control, which resulted in the active noise reduction effect when applied on the field.

The idea of applying the Huygens Principle to active sound field control was pointed out by Jessel et al. inand then various numerical studies and several experiments were undertaken to demonstrate the feasibility of the idea. However, the technology is still far from reality now (Nelson & Elliott ).

Feasibility study of localised active noise control using an audio spotlight and virtual sensors Michael R. Kidner, Cornelis Petersen, Anothony C Zander and Colin H. Hansen () Proceedings of Acoustics Noise of Progress, Clearwater Resort, Christchurch, New Zealand, 20.

Investigation of Active noise control for a vacuum cleaner Simon G. Hill, Scott D. Snyder () - Internal Reports. Performance testing and tuning of inertial actuators Colin H. Hansen, Julio Cordioli, Xun Li, Xiaojun Qiu () Active Control of Electrical Transformer Noise - Group Summary Report for Hong Kong Colin H.

Hansen, Xiaojun. noise of transformer at the same time. Since power transformers can be cooled in different ways, the IEEE () standard prescribes a specific system of describing types of cooling. System of marking and describing the cooling of the transformer is the drive letter with four capital letters, with.

Inter-noise Page 1 of 7 Applying an active noise barrier on a KV power transformer in Hunan Haishan ZOU1; Xiaofan HUANG2; Sheng HU3; Xiaojun QIU4 1,2,4 Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, NanjingChina 3 Hunan Electric Power Corporation Research Institute, China ABSTRACT There are increasing needs to reduce the transformer noise.

NOTE For the purpose of this standard, the term “transformer” means “transformer or reactor”. The methods are applicable to transformers and reactors covered by the IEC series, IECIEC and the IEC series, without limitation as regards size or voltage and when fitted with their normal cooling auxiliaries.

Transformer mounting methods // Transformer mounting methods play an important role in control and reduction of the audible sound coming from the unit. The prime objective is to “isolate” the noise – that is, prevent its mechanical transmission to the supporting structure and connected raceway system.

This can be accomplished with one, or a combination of the following installation. Variable Dampers- a Feasibility Study By George C. Lee, Zach Liang, Quan Gan and Tiecheng Niu Implement a semi-active control system in rotorcraft, and improve the state-of-the-practice damper design and manufacture; (7) Improve control strategies in rotorcraft.

Transformer) is installed to measures the lead-lag displacement directly. Load noise can also be caused by vibrations in the transformer tank walls and magnetic shields due to the electromagnetic forces produced by the load currents.

These electromagnetic forces are proportional to the square of the load currents. The frequency of load noise. Lowering the Transmission of Air-borne Noise. In addition to addressing the structure-borne noise, one needs to abate the transmission of the air-borne noise. This is mainly done via the acoustic treatment of all surfaces (walls, ceiling, and floor) of the room housing the transformer by sound barriers and sound absorbing material.

eNoise Control confirmed with sound readings after installation of the acoustic steel sound wall that our acoustic goals had been met.

Transformer noise can be low frequency tonal in nature and we do recommend hiring an Acoustic Engineer such as eNoise Control to assist in the design of your noise abatement solution. According to ASTM and DIN international standard and other equivalent GB standards, we finished a lot of experiments on physical chemical properties and electric performance of EHV transformer oil.

Based on the experiments data, Kelamayi EHV Transformer Oils are compared with SHELL Diala oil. Domestic Kelamayi oils, which typed KI50AX and KI50GX are blended with SHELL Diala oil in different.

According to ASTM and DIN international standard and other equivalent GB standards, we finished a lot of experiments on physical chemical properties and electric performance of EHV transformer oil. Based on the experiments data, Kelamayi EHV Transformer Oils are compared with SHELL Diala oil used by EHV Power Transmission Co.

Aiming at the special characteristics of EHV Transformer Oils, oil. Transformer Noise – Case Study A power company contacted eNoise Control regarding noise complaints from a residential area close to the company’s transformer station.

The customer attempted to erect a “plywood barrier” to help “stop” the noise. This was met with very little success.

5- Implementation & feasibility study of extending quiet zones in multi-channel narrow-band active noise control systems. 6- Hardware design & implementation of secondary-path estimation in a duct.

7- Implementation & optimization of an active noise canceller system in duct using TMSC 8- Bearing fault detection using wavelet transform. Kidner, C. Petersen, A. Zander, and C.

Hansen, “ Feasibility study of localised active noise control using an audio spotlight and virtual sensors,” in Proceedings of. Load noise, as the total noise of the transformer, including Load noise, can be several dB > No – Load noise, especially in low no – load noise transformers.

Again, the ASV SC of the IEEE Transformers Standards Committee recently approved implementing Load noise measurements in C [1].

For example, Lavrentiev () describes the system of the use of transformer heat for the purpose of heating substation premises of – kV on the basis of an external low-water heat exchanger, a thermal pump and a control cabinet. Kjell () offers a system allowing to profitably use the excess energy of a power transformer.

SINTEF Energy Research 5 Power Electronics at SINTEF cont. Design of prototypes Power components and power circuits Magnetic components for high frequency converters Cooling and packaging EMC design considerations Control electronics Control schemes for current and voltage control of converters Optimization of control loops Optimization of electronics for state monitoring and self-protection.

A virtual sound barrier (VSB) can be applied to reduce transformer noise radiated outward from an opening of an enclosure without scarifying natural ventilation and lighting. Although a traditional independent VSB system consisting of multiple single channel active noise control systems has shown practical potential for solving the noise problem of real transformers, the instability associated.

With the aim to obtain robust performance by manipulating the closed loop poles of the perturbed system, feasibility of the pole placement based controller design techniques is checked for active vibration control applications.

The controllers based on the adaptive and robust pole placement method are implemented on smart structures.noise. The airborne part of the transformer noise is normally abated by enclosing the transformer in a soundproof enclosure (room). The structure-borne part of the noise should be treated by properly isolating the transformer from the structure, abating the transmission of transformer .