R.M.U – Ring main unit is an Electrical power distribution system, A ring main unit is a factory assembled,metal enclosed set of switchgear used at the load connection points of a ring – type distribution network. A Ring Main Unit (RMU) is a totally sealed, gas-insulated compact switchgear unit. The primary switching devices can be either switch disconnectors orContinue reading “R.M.U”
Author Archives: Arshad
W.T.I
Winding Temperature Indicator. It is consists of a sensor bulb placed in the oil filled pocket in the transformer tank top cover.
Auto-Transformer
AUTO-TRANSFORMERS – A transformer, in which a part of the winding is common to both the primary and secondary circuits, is called an auto-transformer. In a two winding transformer, primary and secondary windings are electrically isolated, but in an auto-transformer the two windings are not electrically isolated. Advantages of auto-transformer over two winding transformer. (1)Continue reading “Auto-Transformer”
Step- Down Transformer
A step-down Transformer in which the output (secondary) voltage is lower than its input (primary) voltage is known as step-down transformer.
Step-up Transformer
A step- up Transformer in which the output (secondary) voltage is greater than its input (primary) voltage is known as step-up transformer.
Protection of Transformer
Protections for the transformer are given below: Over current and Earth fault protection. Differential protection for transformer. Differential magnetic-balance protection. Restriction Earth fault (REF) protection. Buchholz relay protection. Thermal protection WTI protection or OTI protection. (PRD)Pressure release device protection. Fuse Protection.
Transformer
A transformer is a electrical device that transfers electrical energy from one electrical circuit to another cuircuits. A varying current in any one coil of the transformer produces a varying Magnetic flux, which in turn induces a varying Electromotive force across any other coils wound around the same core. 1.1 Transformer construction – TRANSFORMER CONSTRUCTIONThere are two general types ofContinue reading “Transformer”
Parts of Transformer
1- Laminated core 2 – windings 3 – Main Tank / Oil Tank 4 – Transformer oil 5 – Conservator Tank 6 – Buchholz Relay 7 – Breather 8 – Radiator
Three Phase Transformer
Three Phase Transformer Generation, transmission and distrbution of electric energy is invariably done through the use of three-phase* systems because of its several advantages over single-phase systems. Assuch, a large number of three-phase transformers are inducted in a 3-phase energy system for stepping-up or stepping-down the voltage as required. For 3-phase up or down transformation,Continue reading “Three Phase Transformer”
Metering and Indication Instrument
These are numerous instruments for metering and Indication in each sub-station -: watt-meters voltmeters ammeters Power Factor meters Kwh meters Volt-ampere meters Kvarh meters. These instruments are installed at different places within substation for controlling and maintaining values of current and voltages.
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