Safety and Environmental concerns of Mobile station

           A mobile station could also be placed in an exceedingly full public space, therefore safety ought to be a primary concern of that utility. Temporary fencing should be encircled the station if it's placed publicly space. Special attention ought to run in specifications to minimum allowable electrical clearances, the interlocking kit.
On multiple voltage transformers, it's essential to produce an operational affiliation chart to be displayed on the station. This operation affiliation chart serves to detail all specific arresters, HV switchgear, 55 switchgear, and Delta/Star switch positions for every potential configuration. the aim of this chart is to stop accidental mal operation which can occur throughout nerve-racking emergency set-up things.

Mobile electrical device

Specially designed electrical device put in on mobile station tram is understood as mobile electrical device.
Design concerns of Mobile electrical device The electrical device is that the main, largest, heaviest, and costliest instrumentation in an exceedingly mobile station. the most criteria of planning a mobile electrical device are to take care of all the desired parameter of the electrical device inside specific limit however at the constant time we've got to place effort to scale back electrical device size, weight and price, and increase the compactness of the electrical device. The electrical device style needs to be optimized in size and weight for transportability and needed electrical parameters.

MVA Rating of Mobile electrical device

For facilitating road transportation mobile electrical device hooked up to mobile station square measure usually factory-made inside limit of sixty MVA rating. usually single incoming and single outgoing feeder is most well-liked. The current rating of incoming or outgoing feeders ought to be but 2000A otherwise the electrical device cooling system and associated instrumentation rating could matter the quality of station.

Insulation Systems of Mobile electrical device

Hybrid Nomex insulation square measure usually most well-liked for quite twenty MVA mobile station. however, this insulation might not be continuously needed for smaller rated substations. Since Nomex insulation is far expensive. For smaller rated station polysaccharide insulation systems may be used if the client needs and agrees. The mobile electrical device is usually rated at 75o C average winding rise over close temperatures. A compromise between reduced insulation life Associate in Nursing an accumulated power rating for a given size and weight of electrical device may be thought-about because the electrical device isn't subjected to be in continuous service throughout its lifelike stationary power electrical device.

Multiple Voltages of Mobile electrical device

It is not economical to construct one mobile station for any explicit HV and 55 application. it's not confirmed that each time the need for temporary service is going to be in same voltage system. For utilizing constant station for various scenario there should be the provisions for multiple voltages. once more for any HV system, there could also be numbers of various 55 services to be provided at the same time. For fulfilling this purpose conjointly mobile electrical device ought to have multiple low voltages. A sensible limit is five voltages. quite five voltages square measure extraordinarily troublesome to the product inside size and weight restrictions. once five low voltages square measure needed, the high voltage ought to be restricted to less than two voltages. once five high voltages square measure needed, the low voltage ought to be restricted inside two. however, increasing numbers of high and low voltages could have an effect on the voltage regulation of the system. therefore for providing multiple voltages we've got to sacrifice the standard of voltage regulation of electrical device.
Provision for Star Delta Re-connection in Mobile electrical device
Internal re-connection isn't counselled for mobile application. this may be done by external de-energized switches.

Mobile electrical device electrical phenomenon

For reducing size and weight, the electrical phenomenon of the electrical device is accumulated considerably. it's seen that a 50MVA mobile electrical device could have electrical phenomenon up to the half-hour. because the electrical phenomenon of the electrical device is high, the voltage regulation becomes poorer which might be salaried by providing the LTC faucet vary from +/- ten certain to +/- 15 August 1945 or bigger that is two.5% in traditional static power electrical device.
Mobile electrical device Losses
Normally no one bothers concerning losses in the mobile electrical device as a result of these transformers square measure used at extreme emergency for brief term amount. however owing to the accumulated electrical phenomenon, the copper losses square measure high in the mobile electrical device. To dissipate heat created by this high load loss, consumption of auxiliary power by electrical device cooling system is additionally high and this may be thought-about as another loss of the electrical device. As mobile electrical device electrical phenomenon will increase, therefore do the load losses and auxiliary cooling losses to dissipate the accumulated heat caused by the load losses. Core losses square measure solely slightly accumulated as compared to a standard static power electrical device.