Category Archive for: «Energy Efficency»

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An example of calculating the number of indoor lighting fixtures

Input information These are the input data for the following calculation: An office area has length: 20 meter; width: 10 meter; height: 3 meter. The ceiling to desk height is 2 meters. The area is to be illuminated to a general level of 250 lux using twin lamp 32 watt CFL luminaires with a SHR […]

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Total Losses in Power Distribution and Transmission Lines (2)

Continued from first part: Total Losses in Power Distribution & Transmission Lines (1) There are two types of transmission and distribution losses: Technical losses (explained in previous part) Non-technical losses (commercial losses) 2. Non-technical (commercial losses) Non-technical losses are at 16.6%, and related to meter reading, defective meter and error in meter reading, billing of […]

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Automatic transfer switch (ATS) between two low-voltage utility supplies

ATS to Emergency / Standby Source Multiple utility services may be used as an emergency or standby source of power. Required is an additional utility service from a separate source and the required switching equipment. Figure 1 shows automatic transfer between two low-voltage utility supplies. Utility source 1 is the normal power line and utility […]

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Electrical Thumb Rules You MUST Follow (Part 3)

Continued from second part: Electrical Thumb Rules You MUST Follow (Part 2) Size of Capacitor for Power Factor Correction For Motor Size of Capacitor = 1/3 Hp of Motor ( 0.12x KW of Motor) For Transformer < 315 KVA 5% of KVA Rating 315 KVA to 1000 KVA 6% of KVA Rating >1000 KVA 8% […]

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Electrical Thumb Rules You MUST Follow (Part 2)

Continued from first part: Electrical Thumb Rules You MUST Follow (Part 1) Useful Electrical Equations For Sinusoidal Current: Form Factor = RMS Value/Average Value = 1.11 For Sinusoidal Current: Peak Factor = Max Value/RMS Value = 1.414 Average Value of Sinusoidal Current (Iav) = 0.637 x Im (Im = Max.Value) RMS Value of Sinusoidal Current […]

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What is the rewind scenario if a motor fails?

Increasing Motor Efficency Unlike an initial motor purchase where your decision is limited to procuring a standard versus a premium efficiency motor, a motor failure or burnout produces three alternatives. Your options are to rewind the failed motor, purchase a new standard-efficiency motor, or purchase an energy-efficient replacement motor. For this scenario, motor installation labor […]

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How to calculate voltage regulation of distribution line

Content Introduction to voltage regulation Voltage Regulation for 11KV, 22KV, 33KV Overhead Line Permissible Voltage Regulation (As per REC) Voltage Regulation Values Required Size of Capacitor Optimum location of capacitors Voltage Rise due to Capacitor installation Calculate % Voltage Regulation of Distribution Line Introduction to voltage regulation Voltage (load) regulation is to maintain a fixed […]

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Brightness, Lamp Life and Efficiency of LED Fixtures

Introduction A typical LED fixture comprises four major component parts: an LED emitter, the fixture’s heat sink, driver and dimming control, and augmenting optics. The emitter includes the die, a thermal heat sink, lens, and outer package (Figure 1). The die is the actual LED chip within the emitter. The color of the light is […]

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An Overview of Combined Cycle Power Plant

Abstract The Combined Cycle Power Plant or combined cycle gas turbine, a gas turbine generator generates electricity and waste heat is used to make steam to generate additional electricity via a steam turbine. The gas turbine is one of the most efficient one for the conversion of gas fuels to mechanical power or electricity. The […]

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An Overview Of Smart Power Grid

Abstract The present electric grids use the technology of 1970’s. But with the advancement in various concepts of power generation, problems associated with power outages and thefts, and also due to increase in demand, we require a modernized grid to avail all the needs of customers even in the situations of hype, which can be […]

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