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POSITION OF EQUIPMENT IN SUB-STATION A-   Primary Power Lines (1) B-   Secondary Power Lines (12) 2-   Ground Wire 3-   Over Head Line 4-   Potential Transformer(Voltage Transformer) 5-   Disconnecting Switch (Isolator) 6-   C.B. 7-   Current Transformer 8-   Lighting Arrester 9-   Main Transformer 10- Control Building 11- Security Fence A substation is a part of an electrical generation, transmission and distribution system. Substation transform voltage from high to low, or the reverse or perform any of other several important functions. Substation may be owned and operated by an electrical utility or may be owned by a large industrial or commercial customer. Generally substations are unattended, relaying on SCADA for remote supervision and control. Power Transformer or Main Transformer This is the most important equipment of any substation around which all other equipments are arranged to

1. In treated Earth wire, Earth wire is treated with following things? Ans. charcoal & salt 2. In one and a half bus bar system ___ no. of CBs are used in diameter? Ans. 3      3. skewing in IM motor is for? Ans. To reduce noise      4. In a core of Transformer, stamping is provided to reduce? Ans. eddy current losses 5. p.f. variation of alternator is? Ans. lagging to leading       6. In alternator for fix input if field excitation is increased then ? Ans. active power increase 7. Gravel is provided in substation for? Ans. to increase resistance between ground to worker's foot 8. The standard current rating of an electromagnetic relay are? Ans. 1A and 5A 9. A distance relay is said to be inherently directional if its characteristics on R-X diagram? Ans. is a circle that passes through the origin 10. Load flow study is carried for.... Ans. System Planning 11. The effect of ice deposition on conductor is... Ans. Increased in W