DefinitionA hot - wire instrument is defined as a type of measuring device that utilizes the heating effect of an electric current to determine the magnitude of that current. Its operation is based on the principle that when an electric current passes through a wire, the heat generated causes the wire to expand, increasing its length. This versatile instrument is capable of measuring both alternating current (AC) and direct current (DC), making it a valuable tool in various electrical applicatio

DefinitionA thermocouple instrument is defined as a measuring device that utilizes a thermocouple to determine temperature, current, and voltage. This versatile instrument is capable of making measurements in both alternating current (AC) and direct current (DC) circuits, making it a valuable tool across a wide range of applications.Thermocouple BasicsA thermocouple is an electrical device consisting of two wires made from different metals. Its functionality is based on a fundamental principle:

What is Capacitive Voltage Transformer?Definition: A capacitive voltage transformer (CVT), also known as a capacitive potential transformer, steps down high - voltage input signals to provide low - voltage signals that can be easily measured by measuring instruments.The capacitive potential divider, inductive element, and auxiliary transformer are the three main components of a capacitive potential transformer.Why is a Capacitive Voltage Transformer (CVT) Needed?When measuring high voltages abov

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