(Pdf) development of new partial discharge sensors for condition monitoring of power system equipment i electricity bill com


In-homogeneities, impurities, weakness within the insulating material k electric jobs 2015 or improper positioning of the electrode across insulator causes uneven electric field distribution into the localized area, which often creates partial discharge (PD) and are common mainly in high voltage power apparatus. After initiation of partial discharge into the localized region, it starts damaging the whole insulator with time. Thus detection of PD has become a major challenge for the researchers. This paper presents a method for design of low cost sensor for detection of PD, by detecting the radio frequency (RF) wave with the help of a patch antenna, which is simple and can be manufactured easily. A step by step approach has been described to develop the antenna for the detection of PD. Different analysis as required for the design parameter of the antenna has gas vs electric water heater savings been simulated by ZELAND IE3D and presented in this paper. An experimental study has also been performed in the laboratory environment to validate the simulated results. The above study shows that, the indigenously made RF sensor is suitable to detect the partial discharge of a high voltage power apparatus and it is a cost effective tool in the field of online monitoring of partial discharge measurement.

The increasing significance of a current state dependent maintenance and the demand for a reliability and an economical operation gas density of air of power industry devices led to a discussion about monitoring and diagnosis possibilities for high-voltage (h-v) transformers which are one of the mast important valuable network components. in the area of high field devices only the use of optical measurement techniques offers the possibility to supervise the characteristic measurands, e.g. critical temperatures or the occurance of Partial Discharges (PDs). Therefore a temperature detector based an Fiber Bragg Gratings (FBG) is presented, who allows a semi-distributed measurement at the active part of the h-v transformer. In this connection some points dealing with gas x dosage for dogs cost-effective signal processing units and details about a succesful integration of the sensing elements are investigated and the experimental results are shown. Partial discharges at transformers mainly occure in the insulating oil and on oil-surfaces. Hereby the quantity and amplitude of the PDs are relevant to the actual assessment of the transformer. To analyze the reason for occurrence of PDs it is necessary to localize and characterize the PD source. For on-line detection of PDs the measuring equipment must physics c electricity and magnetism be placed into the oil. For this application a potential free experimental setup, based on a fiber optical system, for PD detection is described. By using a Mach-Zehnder-Interferometer for acousto-optic measurement the existence of PDs can be detected. By using fiber optical sensors for temperature and PD detection it is possible to watch the operating conditions of h-v transformers and avoid critical states.

The major problems associated with conventional partial discharge measurements electricity trading hubs in high voltage power equipment such as oil-filled transformers are electrical interference and the difficulty of access to the insulation structure in the equipment. These limit the location ability and sensitivity when monitoring partial discharge activity in the insulation. Piezo-electric acoustic sensors which … [Show full abstract] monitor the ultrasonic pressure generated by partial discharge activity can overcome the electrical interference problem to a degree and with multiple sensor systems they can give some location details by triangulation. But because they require galvanic connection to recorders they have to be mounted externally or in very low electric field regions internally, which leaves them remote from potential PD sites. Such external mounting 3 gases that cause global warming also has the disadvantage of providing multiple paths in oil and along the steel tank for ultrasonic waves between the PD site and the sensor, leading to problems in interpretation of arrival times. Fibre-optic based acoustic sensors have a high intrinsic dielectric strength and can thus be located in high field regions where the partial discharge activity is likely to occur in the electrical insulation. They do not suffer from electrical interference and thus, with gas x strips review these advantages, they provide significant potential for use as partial discharge sensors. This paper presents results obtained in developing and in monitoring partial discharge activity with fibre-based PD sensors based on the use of interferometric techniques to monitor changes in optical path in fibres caused by ultrasonic pressure acting on the electricity and magnetism worksheets high school fibre. This technique requires long fibre lengths wound in coils and this makes the sensor very bulky. A reduction in size is achieved by using a Fibre Bragg Grating (FBG) as the sensor. The pressure changes the characteristic frequency of the Bragg grating and provides a much smaller sensor size. Results are presented of some recent work on developments of the FBG for acoustic sensing and also on the development of a distributed feedback fibre laser (DFBFL) pressure sensor. Such optically based sensors have considerable potential and benefit for practical use in monitoring partial discharge activity in a wide range of high-voltage power system equipment where conventional PD detectors electricity laws physics are difficult to use or are limited in their scope. Such sensors can be internally mounted as permanent installations within the HV insulation or they can be externally mounted on surfaces such as bushing insulation where normal acoustic sensors cannot be placed. Read more