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

Dual Trace OscilloscopeDefinition: In a dual - trace oscilloscope, a single electron beam generates two traces, which are deflected by two independent sources. To produce these two separate traces, two main methods are employed: the alternate mode and the chopped mode. These are also referred to as the two operating modes of the switch.A question then arises: why is such an oscilloscope necessary?When analyzing or studying multiple electronic circuits, comparing their voltages is crucial. One op

What is Electronic Voltmeter?DefinitionAn electronic voltmeter is a voltmeter that utilizes an amplifier to enhance its sensitivity. It is capable of measuring the voltages of both AC and DC devices. Thanks to its high input resistance, the electronic voltmeter provides accurate readings.A moving - coil voltmeter struggles to detect low voltages, but the electronic voltmeter overcomes this limitation. The electronic voltmeter has high input impedance, enabling it to detect signals of extremely w

What is Differential Voltmeter ？Definition: A voltmeter that measures the difference between a known voltage source and an unknown voltage source is called a differential voltmeter. It operates based on the principle of comparing the reference voltage source with the unknown voltage source.The differential voltmeter offers very high accuracy. Its operating principle is similar to that of a potentiometer, and thus it is also known as a potentiometer voltmeter.Construction of Differential Voltmete

The No - Load Test serves as an indirect approach for ascertaining the efficiency of three - phase induction motors. It also enables the determination of the circuit parameters of their equivalent circuits. Similarly, the open - circuit test is carried out on transformers. In fact, the no - load test on an induction motor is conceptually equivalent to the open - circuit test on a transformer.During this test, the motor is decoupled from its load. Then, the rated voltage at the rated frequency is

DefinitionConducting a full - load test on a small transformer is quite convenient. However, when it comes to large transformers, this task becomes extremely challenging. The maximum temperature rise in a large transformer is typically determined through a full - load test. This particular test is also known as the back - to - back test, regenerative test, or Sumpner’s test.Finding a suitable load that can absorb the full - load power of a large transformer is not an easy feat. As a result, a si

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

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

Definition：An earth tester is an instrument designed for measuring the resistance of the earth. In a power system, all equipment is connected to the earth via an earth electrode. The earth plays a vital role in safeguarding both the equipment and personnel from fault currents. The resistance of the earth is extremely low, allowing the fault current passing through the earth electrode to be safely dissipated into the ground, thus protecting the power system from damage.Earth electrodes are also c