Testing of Cables High voltage power cables have proved quite useful, especially in the case of HV d.c. transmission. Underground distribution using cables not only adds to the aesthetic looks of a metropolitan city but it provides better environments and more reliable supply to the consumers. Preparation of Cable Sample The cable sample has to […]
Testing of Overhead Line Insulators Various types of overhead line insulators are (i) Pin type (ii) Post type (iii) String insulator unit (iv) Suspension insulator string (v) Tension insulator. Arrangement of Insulators for Test The string insulator unit should be hung by a suspension eye from an earthed metal cross arm. The test voltage is
Applications of Insulating Materials Insulating fluids (gases and liquids) provide insulation between phases and between phase and grounded parts of electrical equipment. These also carry out heat from the windings of the electrical equipment. However, solid insulating materials are used only to provide insulation. While describing the dielectric and other properties of various insulating materials,
Properties of Insulating Materials The main requirements of the insulating materials used for power apparatus are: Vulcanized Rubber Rubber in its natural form is highly insulating but it absorbs moisture readily and gets oxidized into a resinous material; thereby it loses insulating properties. When it is mixed with sulfur along with other carefully chosen ingredients
Voltage Distribution Over Suspension Insulator String Suspension Insulators: As the voltage level increases, pin-type insulators become very bulky and their cost also increases rapidly. Hence the most popular insulators used for very high voltage transmission lines are suspension-type insulators. These insulators have several porcelain disc units. These units are connected in series with the help
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1. Corona is (a) partial breakdown of air. (b) complete breakdown of air. (c) sparking between lines. 2. Which of the following statements is true regarding corona ? (a) Corona takes place at a voltage lower than breakdown voltage. (b) Corona takes place at a voltage higher than breakdown voltage. (c) Corona is a current
Testing of Power System Insulators The insulators are tested according to the standards. The following tests are performed while testing an insulator : These tests are further grouped into three classes according to the standards which are, Type tests: These tests are performed to judge the design and specified ratings of the insulator. These tests
Ever had trouble choosing the right thermometer for your project? Well, you’re not alone. This post will go through both analog and digital thermometers, showing you their benefits. Hang on tightly to yourself; This will be exciting. Key Takeaways Overview of Temperature Sensors Temperature sensors like thermometers for your appliances. They monitor how hot or
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In modern power systems, the power flow in the transmission lines can be controlled with the use of power electronics. The Flexible A.C. Transmission Systems (FACTS) give solutions to the problems and limitations that were introduced in the power system with the introduction of power electronics-based control for reactive power. The FACTS technology making use
What is a Time Delay Relay? A time delay relay is a common and useful device in electrical control systems. It can control the switching behavior of a circuit according to a preset time delay, thus realizing specific functional requirements. This article will introduce the working principle of time delay relay, connection and its wide