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Reverse Power Relay - Function and Operation

http://www.electrotechnik.net/2009/06/reverse-power-relay-function-and.html

Reverse Power Relay - Function and Operation. A reverse power relay is a directional power relay that is used to monitor the power from a generator running in parallel with another generator or the utility. The function of the reverse power relay is to prevent a reverse power condition in which power flows from the bus bar into the generator. This condition can occur when there is a failure in the prime mover such as an engine or a turbine which drives the generator. Causes of Reverse Power. Frequency an...

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Resource Page - Batteries

http://www.electrotechnik.net/2015/05/resource-page-batteries.html

Resource Page - Batteries. Float and Boost Charging of Batteries. Battery Explosions - Causes and Prevention. C Rating and battery capacity. Battery Testers - An Overview. Ampere Hours and Battery Capacity. Specific Power in a battery. What is the lifetime of a Rechargeable Battery? What are Cold Cranking Amps in a Battery? What is a Prismatic Battery? Energy Density in a Battery. Can batteries of different A.h (ampere hour) ratings be used together . Jumper Cables in cars. Recycling Lead Acid Batteries.

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Cable Sleeves-An overview

http://www.electrotechnik.net/2015/08/cable-sleeves-overview.html

Cable Sleeves are used to enclose a single wire or a group of wires.  Cable sleeves are used to arrange a set of wires going through a panel or to an equipment like a motor.  Cable sleeves are made of different materials from braided metals to rubber and even kevlar. . Sleeves serve to protect the wires and their insulation from sharp edges.  They can protect wires from UV radiation, moisture, oil and temperature. . Voltage Classification - LV, MV and EHV. The impedance of a transformer is defined as the...

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Induction Motors vs Synchronous Motors-A comparison

http://www.electrotechnik.net/2015/07/induction-motors-vs-synchronous-motors.html

Induction Motors vs Synchronous Motors-A comparison. The speed varies below the synchronous speed and can be adjusted. The speed is constant and rotates at the synchronous speed. Simple and Rugged Construction. A slightly complex construction. It is self starting. Special Starting Procedures are required. Cannot be used for PF improvement. Can be used for PF improvement. Does not require external excitation. Requires DC excitation for rotor. Voltage Classification - LV, MV and EHV.

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Calculating the percentage impedance of a Transformer

http://www.electrotechnik.net/2010/01/calculating-percentage-impedance-of.html

Calculating the percentage impedance of a Transformer. The impedance of a transformer is defined as the percentage of the drop in voltage to the at full load to the rated voltage of the transformer. This drop in voltage is due to the winding resistance and leakage reactance. Alternatively, the percentage of a transformer can be described as the percentage of the nominal voltage in the primary that is required to circulate the rated current in the secondary. Z%= (Impedance Voltage/Rated Voltage)*100.

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What is the difference between Salient and Non-Salient Pole Rotors used in Synchronous Generators

http://www.electrotechnik.net/2009/09/what-is-difference-between-salient-and.html

What is the difference between Salient and Non-Salient Pole Rotors used in Synchronous Generators. Rotors used in Synchronous alternators can be classified into. 1)Salient and 2)Non-Salient Pole Rotors. Salient pole rotors are used in application with speeds from 100 to 1500rpm. They are alternative known as "projected pole" type of rotors. These are sometimes known as "drum rotors". Since these rotors are cylindrical, the windage loss is reduced. Voltage Classification - LV, MV and EHV. Tan Delta testin...

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Checking the Polarity of Current Transformers

http://www.electrotechnik.net/2009/04/checking-polarity-of-current.html

Checking the Polarity of Current Transformers. The Polarity of current transformers is extremely important. Just like a battery, a current transformer too has a polarity. The polarity determines the direction of the secondary current in relation to the primary current. Wrong connection of the current transformers can cause false operation of the protection relays. Hence, it is vital to ensure that the current transformers are connected with the correct polarity. Voltage Classification - LV, MV and EHV.

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Resource Page-Cables

http://www.electrotechnik.net/2015/05/resource-page-cable.html

Water Trees and Electrical Trees and their role in cable insulation. Trefoil Formation for Arranging Cables. Tan Delta testing - Principle and Method. Bending Radius of Cables. What is a ribbon cable? Video - Lewek Connector - Cable installer for ABB high voltage . Earthed and Unearthed Power Cables. XLPE Insulation for Cables. Voltage Classification - LV, MV and EHV. Calculating the percentage impedance of a Transformer. Static and Dynamic Resistance. Tan Delta testing - Principle and Method.

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Resource Page-Capacitors

http://www.electrotechnik.net/2015/05/resource-page-capacitor.html

What are Surge Capacitors? What are the causes for the failure of capacitors? What is a DC link Capacitor? What are Bleeder Resistors in Capacitors. Capacitor Protection Relays - An Overview. What is the difference between a condenser and a capacitor? Drying of Electrolytic Capacitors. What are X and Y capacitors? Capacitance Drift in Capacitors. Types of Single phase motors. Pressure Relief Vent in Electrolytic Capacitors. Capacitors and Power Factor Correction. What are Air Capacitors? Advantages of Th...

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Transformers-Resource Page

http://www.electrotechnik.net/2015/05/transformers-resource-page.html

Conditions for Paralleling two Transformers. Comparison of Dry Type Transformers. And Oil Filled Transformers. Checking the Polarity of Current Transformers. Transformer Classification based on the Cooling Medium. Magnetic Balance Test on Transformers. Wwwelectrotechnik.net/./magnetic-balance-test-on- transformers. What are the reasons for transformer overheating? Wound Primary Current Transformers. Split Core Current Transformers. Solutions for Noise and Vibration in Transformers. Tan Delta is a a diagn...