Engineering

Electrical Excel Tools

Excel base Programs (Electrical Engineering):       Designed by: Jignesh.Parmar Cable Designing Program FREE DOWNLOAD Calculate Voltage drop of Cable. Calculate  Size of Cable. Calculate Current Capacity of Cable. Conduit Size Selection Program FREE DOWNLOAD Calculate Size of Conduit for LT Cable/CAT-5 Cable/Fiber Optical Cable. Selection of  MCCB,ELCB  For Main /Branch Circuit. FREE DOWNLOAD Calculate …

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Type of Gland

Cable Glands A device designed to permit the entry of cable in to electrical equipment which provide sealing ,retention and earthing, bonding, grounding, insulation, strain relief or combination of all these. Gland should maintain overall integrity of enclosure in to which it is to be fitted. Gland Selection Gland should be selected on following Points…

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Gland Size Selection

Gland Selection Table: 600 / 1000v stranded copper conductors pvc insulated with steel wire amour and PVC sheathed overall. (BS 6346 : 1997) Cable Size Conductor Numbers of Cores Nom. Area (mm2) Neutral 1 2 3 31/2 4 5 7 10 12 19 27 37 48 1.5 – – 16 16 – 20S 20S 20S…

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EHV XLPE – Current Rating

EHV XLPE Cable: 3.8 / 6.6 KV(6.6 KV Earthed) Single Core AL/COPPER COND, XLPE INSULATED  CABLES As per IS:7098 (Part-II) Cross-sectional area        (Sq MM)   ARMOURED CABLE Overall Diameter (mm) Normal Current Rating in Amps  Short Circuit Current Rating for 1Sec.duration in K. Amps  Aluminum Conductor Copper Conductor Aluminum Copper Ground Duct Air Ground Duct…

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XLPE Cable-Current Rating

XLPE Insulated Armored & Unarmored Cables: 1.1 KV SINGLE CORE AL/COPPER COND,XLPE INSULATED CABLES As per IS:7098 (Part-I) Cross-sectional area        (Sq MM) UN-ARMOURED CABLE Overall Diameter (mm) Normal Current Rating in Amps Short Circuit Current Rating for 1Sec.duration in K. Amps Aluminums Conductor Copper Conductor Aluminums Copper Ground Duct Air Ground Duct Air 1cX4 8…

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PCV Cable-Current Rating

Flexible PVC Insulated Cable PVC- Insulated 1 core unsheathed / Sheathed flexible cord with copper conductor 1.1KV                                         ( As per IS:694 – 1990 ) Nominal Conductor Area (Sq.mm) UN SHEATHED SHEATHED Maximum Conductor Resistance at 20°C (ohm/km) Current Carrying Capacity (Amp) Nominal Thickness of Insulation (mm) Maximum overall Diameter (mm) Approx. Weight (kg/100m) Nominal Thickness…

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Minimum Electrical Clearance.

Minimum Electrical Clearance As Per BS:162. INDOOR Voltage in KV Phase to earth in mm Phase to phase in mm 0.415 15.8 19.05 0.600 19.05 19.05 3.3 50.8 50.8 6.6 63.5 88.9 11 76.2 127.0 15 101.6 165.1 22 139.7 241.3 33 222.25 355.6 Minimum Electrical Clearance As Per BS:162. OUTDOOR Voltage in KV Phase…

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Fuse

What is Fuses A fuse is a device that protects a circuit from an over current condition only.  It has a fusible link directly heated and destroyed by the current passing through it.    A  fuse  contains  a  current- carrying element sized so that the heat generated by the flow of normal current through it does…

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Current Transformer

Current transformers Principle of operation of CT A current transformer is defined as “as an instrument transformer in which the secondary current is substantially proportional to the primary current (under normal conditions of operation) and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections.” Current…

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Difference between Power T.C & Distribution T.C

Difference between Power Transformer & Distribution Transformer: Power transformers are used in transmission network of higher voltages for step-up and step down application (400 kV, 200 kV, 110 kV, 66 kV, 33kV) and are generally rated above 200MVA. Distribution transformers are used for lower voltage distribution networks as a means to end user connectivity. (11kV,…

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Transformer

Standard Transformer Accessories & Fittings: Standard Transformer Fittings: 1)    Standard Fittings Rating and terminal marking plate. Tap Changing arrangement Off – circuit tap changing switch Off – circuit tap changing link On Load tap changer Two earthing terminals  Lifting Lugs Drain – cum filter valve Pressure Relief Device Silica gel dehydrating breather. Oil Level Indicator. Thermometer…

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Type of Electrical Power Distribution systems

Type of Electrical Power Distribution Systems: Electrical power is distribution either three wires or Four wires (3 wire for phases and 1 wire for Neutral). Voltage between Phase to Phase Called Line Voltage and Voltage between Phase and Neutral is Called Phase Voltage. This Forth wire may or may not be distributed in Distribution System…

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Type of Cable Tray

Introduction: Today cable trays have become a necessary part of industrial and commercial construction by offering quick, economical and flexible solutions to these problems. Cable trays are capable of supporting all types of wiring: High Voltage Power Lines. Power Distribution Cables Sensitive Control Wiring Telecommunication Wiring Optical Cables Cable Tray Materials:  Most cable tray systems…

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11KV/415V Overhead Line Specification(REC)

11KV/415V over Head Line’s Specification and Installation (REC):  11KV LIGHTNING ARRESTER (IS: 3070 (Pt-II)). Voltage Rating for LA: The rated voltage of lightning arresters shall be 9 KV (rms). This will be applicable to the effectively earthed 11 KV systems co-efficient of earth not exceeding 80 percent as per IS: 4004 with all the transformer…

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Tampering Methods of Energy Meter

Tampering Method of Electrical Energy Method: Following Description is only for awareness regarding Electrical Energy Theft. Do not use these techniques otherwise You may be booked under Electrical energy theft act 135.

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