Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

What is Valve Type Lightning Arrester？DefinitionA lightning arrester that consists of single or multiple gaps connected in series with a current - controlling element is known as a lightning arrester. The gap between the electrodes blocks the flow of current through the arrester, except when the voltage across the gap exceeds the critical gap flashover voltage. The valve - type arrester is also referred to as a gap surge diverter or a silicon carbide surge diverter with a series gap.Construction

Traditionally, the moisture level in SF6 gas - insulated equipments was checked by periodically collecting gas samples. However, in recent years, condition monitoring systems equipped with online instrumentation for measuring the dew point of SF6 have become increasingly prevalent.Nowadays, it is quite common to install dew point sensors in the same sensor block as pressure relays or density sensors. Additionally, these sensor blocks are often not directly attached to the main gas tank. Instead,

What is the types of Fuses?A fuse is a current - interrupting device. It breaks or opens the circuit by melting its fuse element, thereby isolating the faulty device from the main supply circuit. Fuses are mainly classified into two types based on the input supply voltage: AC fuses and DC fuses. The various types of fuses are depicted in the image below.DC FuseA DC fuse functions to open or break the circuit when an excessive current passes through it. However, the major challenge with DC fuses

What is Arcing Ground ？Definition: Arcing ground refers to a surge that arises when the neutral is not earthed. This phenomenon occurs in ungrounded three - phase systems due to the flow of capacitive current. Capacitive current is the current that flows between conductors when a voltage is applied. The voltage across the capacitances is called the phase voltage. During a fault, the voltage across the capacitance in the faulted phase drops to zero, while in the other phases, the voltage increase

One method for detecting SF6 gas leakage in a substation is to use a reliable infrared camera with SF6 gas detection capabilities. This enables the identification of potential leaks during routine maintenance rounds. These new - generation infrared cameras integrate a high - performance thermal imager with a reliable pistol - grip form factor and SF6 gas detection functionality.These devices offer several advantages over other methods, as detailed below: They allow maintenance to be scheduled at

Lightning impulse voltage (LIWL) tests and switching impulse voltage tests are carried out to assess the dielectric stress resulting from transient over - voltages induced by lightning strikes and switching operations respectively. An impulse voltage generator produces a steep - front voltage waveform, which is then applied to the test object. A measurement system, consisting of a voltage divider and a digital recorder, is used to measure and analyze the test voltages and their waveforms.The fig

Primary ProtectionPrimary protection, also known as main protection, serves as the first - line of defense. It is designed to rapidly and selectively clear faults within the boundaries of the specific circuit section or element it safeguards. Each section of an electrical installation is equipped with primary protection. This protection mechanism is engineered to respond promptly to abnormal conditions, ensuring that the affected area is isolated as quickly as possible to minimize damage and dis

This test just apply to 3 pole operation circuit breakers.As Fig these circuits use a three-phase current source and, generally, two voltage sources. one voltage source provides the TRV for the first pole-to-clear and the other gives the recovery voltage for the second- and third poles-to-clear, in the case where these poles clear simultaneously as in non-effectively earthed systems.This system have following components: A three phase current source (G) Voltage source 1 with current injection pa

What is Fluxmeter？DefinitionA flux meter is an instrument designed to measure the magnetic flux of a permanent magnet. It represents an advanced iteration of the ballistic galvanometer, boasting certain advantages. Specifically, the flux meter features low controlling torque and significant electromagnetic damping.Construction of Flux MeterThe construction of the flux meter is depicted in the figure below. The flux meter incorporates a coil that is freely suspended using a spring and a single si

What is Creeping in Energy Meter？DefinitionCreeping in an energy meter is a phenomenon where the aluminium disc rotates continuously when only voltage is applied to the pressure coil and no current flows through the current coil. In essence, it is an error causing the energy meter to consume a minute amount of energy even when no load is connected to the meter.Impact and Causes of CreepingCreeping can increase the disc's rotation speed even under light - load conditions, leading to inflated mete