Protection

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Relay test device learning

Relay Test Device type PW636I has 4 output 300V and 6 output 32A can test all types of protective relays, including modern IEC61850 based relays. This device is the ideal test device for all power utilities , power plants , relay manufactures , panel manufactures , research institutes , testing companies. In this paper, we intend to have an overview of the device and its components.

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Types of relay

A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal.

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Differential Protection of Generator or Alternator

Any internal fault inside the stator winding is cleared by mainly differential protection scheme of the generator or alternator.The differential protection is provided in the generator by using longitudinal differential relay.

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What is the distance relay

Distance protection relay is the name given to the protection, whose action depends on the distance of the feeding point to the fault. IF the distance which is measured is less than the considered value for relay, the relay will protect the system and operate. Only by using the Distance relay, all faults in any location of system can be cleared. So, Distance relays are the best relays for protecting transmission energy systems. Even in high voltage and medium voltage systems, Distance relays are used.

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Surge Arrester Circuit

Lightning surges frequently invade the electronic systems through AC power supplies, it is necessary to install the surge protective devices (SPDs) on the supply lines to protect the electronic equipment against lightning overvoltages.

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earthing in pool

For the first time in the 1962 edition of the National Electrical Code standard and connected to the earth system is explained in the pool.

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Choose a method of installation Lightning

Different methods for attracting lightning conductors installed in air terminals (lightning protection system) that includes methods for protection angle, the ball is rolling and mesh.

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Principles of Performance active lightning arrester (ESE)

Active or Active Early Streamer Emission lightning that are known or ESE Balarndh channel created artificially, resulting in faster performance and increase the protective radius.

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Electromagnetic induction

Electromagnetic pulse interaction with the system can be affected two systems caused long lines and structural effects, be divided.

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The introduction of electromagnetic

Man-made electromagnetic wave propagation naturally exist in the environment. Man-made sources include radio transmitters, radars, electrical switches, brushless electric motors is electromagnetic Vtslyhat.

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Electromagnetic threats

Risks of electromagnetic permanent existence in the space around us, such as natural hazards like lightning and risks such as radar systems, diesel generators, welding machines, wireless or any other radiation, it is increasingly realized the importance of safety, electromagnetic comprehensive.

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Lightning

Everything starts from the sun to Earth. Sun's surface water evaporated and the cloud. Winds brought clouds to move on. Pregnant clouds on its way and if close to the ground creates lightning. Maybe lightning was one of the first meteorological phenomenon that has attracted human attention. Thunderbolt is a high-energy electrical discharge between clouds and the Earth's pregnant, be in addition to the fatalities, and injuries directly or indirectly disrupt power equipment and network equipment. This may be the emergence of "voltage" or "strong magnetic field" of equipment or animals to be huge effect and cause damages. Statistics annual damages caused by lightning, represents the destructive power of this phenomenon is normal.

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