OmtechnicalSolutions

Transformer Condition monitoring

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Condition Monitoring of Transformers is the process of acquisition and processing of data related to various parameters of transformers so as to predict and prevent the failure of a transformer. This is done by observing the deviation of the transformer parameters from their expected values. Transformers are the most critical assets of electrical transmission and distribution system. Transformer failures could cause power outages, personal and environmental hazards and expensive rerouting or purchase of power from other suppliers. Transformer failures can occur due to various causes. Transformer in-service interruptions and failures usually result from dielectric breakdown, winding distortion caused by short-circuit withstand, winding and magnetic circuit hot spot, electrical disturbances, deterioration of insulation, lightning, inadequate maintenance, loose connections, overloading, failure of accessories such as OLTCs, bushings, etc.[1] Integrating the ‘individual cause’ monitoring allows for monitoring the overall condition of transformer.

Electrical testing & Measuring Instruments

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Test equipment is necessary for determining proper set up, adjustment, operation, and maintenance of electrical systems and control panels.

Distribution board and batteries

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DC power systems and stationary battery in switchgear and control applications are typically designed and operated as ungrounded systems which means that there is no intentional low resistance or solid connection to ground from either the positive polarity or negative polarity of the dc system. Ground faults happen when a current-carrying conductor makes unwanted contact with an equipment grounding conductor, or any piece of metal that is grounded. This can occur through damaged conductor insulation or with improper installation. This is a potentially dangerous situation.Multiple grounds can occur on the dc system at the same time. This situation becomes critical when the combined ground resistance becomes so low that high-voltage circuit breaker control schemes are unable to open or close breakers when required or dc system circuit breakers and or fuses open due to over current resulting in de-energization of vital operating equipment.

Synthetic and Natural Transformer Oil

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The benefits of immersing transformer coils in a dielectric fluid have long been understood. The use of such a fluid allows designers to reduce electrical clearances and greatly improve cooling performance, thus making transformers more compact. For many years, mineral oil has been used in electrical transformers due to its cooling and electrical performance. However,the shortcomings of mineral oil are now acknowledged in terms of its flammability, poor environmental performance, low moisture tolerance and corrosive sulphur.


The solution is to use ester based fluids, since they are fire safe, readily biodegradable, free from corrosive sulphur compounds and have excellent dielectric characteristics. Ester fluids have also been shown to extend the life of cellulose insulation, bringing further benefits to operators.

Switchgear / GIS conditioning monitoring

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To realize GIS smart monitoring and information exchange, IED device for smart monitoring is used to collect such real-time data and information on electricity and non-electricity, including local discharge peak value, phase, frequency, SF6 gas moisture, density, SF6 gas constituents, current to closing (opening)coil of circuit breaker, circuit breaker vibration signals, leakage current, breaking current and corresponding alarm information. It will store such information in the form of log, and send them to main IED in the form of MMS messaging. The main IED will manage to realize preliminary fault warning, status evaluation and fault diagnosis based on the threshold value as set as per relevant standards.

Motor / Generator condition monitoring

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Motors and generators – like any other machines – are subject to wear and aging. The materials and components they are made from degrade over time, and if no action is taken they will eventually fail. Fortunately most types of failure can be prevented by maintenance. To plan maintenance effectively,

the plant operator must have accurate information: which components need repairing or replacing, and when?

Cable route/ fault locator and conditioning monitoring

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Power quality and mitigation

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Transmission Lines and Electrical tools

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