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Step up substation
Increases the voltage level for transmission
Is located at generating station
Either (a) or (b)
Both (a) and (b)
Either (a) or (b)
A step-up substation is primarily designed to increase the voltage level of generated electrical power for efficient long-distance transmission. These substations are inherently located at the site of generating stations, making both statements (A) and (B) defining characteristics of the facility.
A step-up substation is primarily designed to increase the voltage level of generated electrical power for efficient long-distance transmission. These substations are inherently located at the site of generating stations, making both statements (A) and (B) defining characteristics of the facility.
P=3тАЛVLтАЛILтАЛcos╧Х тАФ Power relation indicating voltage increase leads to current decrease
PlossтАЛ=I2R тАФ Power loss formula highlighting the benefit of current reduction
The principle relies on electromagnetic induction using step-up transformers. By increasing the transmission voltage (V), the line current (I) is proportionally reduced for a fixed power (P=VI), which significantly minimizes I2R transmission losses and reduces conductor material requirements.
Step-up substations utilize power transformers to increase voltage from generator levels (typically 11kV-25kV) to transmission levels (132kV, 220kV, 400kV, 765kV).
They are functionally integrated with generating stations to reduce energy losses during transport to load centers.
The primary component is the step-up transformer (GSU - Generator Step-Up unit).
Reduces transmission line current for a given power load.
Decreases I2R copper losses in the lines.
Allows for smaller conductor cross-sectional area, reducing infrastructure costs.
Requires high-voltage insulation and specialized switchgear.
High initial capital investment for transformers and high-voltage circuit breakers.
Thermal power plants
Hydro-electric power stations
Nuclear power facilities
Since a step-up substation must perform the task of stepping up voltage (Option A) and is located at the generation site to receive that power (Option B), both descriptors are accurate.
Option (C) acts as the logical intersection given that both premise (A) and (B) describe the same installation.
C is correct тАФ Because a step-up substation by definition increases voltage and is physically situated at the generating station, both statements describe the system correctly.
Always relate substation function to its location: step-up is at the source, while step-down is closer to distribution/load centers.