Three-phase voltmeter is an instrument used to measure the voltage in a three-phase alternating current system. In power systems, three-phase voltage refers to the voltage signal formed by three sine waves, which is usually used to supply and transmit electrical energy. Three-phase voltmeter is designed based on the principle of electromagnetic induction and voltage measurement technology, and is widely used in industrial, commercial and residential fields. This paper will introduce the definition, function and characteristics of three-phase voltmeter, as well as the matters needing attention when using the meter. Note the following when using a three-phase voltmeter: 1 Safe Operation Ensure safe operation before using a three-phase voltmeter. First of all, the integrity of the instrument itself and the reliability of the connection line should be checked. Secondly, before electrical measurement, it is necessary to disconnect the power supply and follow the correct operating procedures and specifications to prevent electric shock and other safety accidents. 2 Select the correct range When using a three-phase voltmeter, it is necessary to select the appropriate range according to the actual voltage range measured. If the range is too small, it may cause the voltage to exceed the range and cannot be accurately measured, or even damage the instrument; Conversely, choosing too large a range may lead to less accurate measurement results. Therefore, before using a three-phase voltmeter, you should understand the range of the voltage to be measured and choose the appropriate range for measurement. 3 Pay attention to electrical connections Correct electrical wiring is the key to ensuring measurement accuracy and safety. When connecting the three-phase voltmeter, attention should be paid to the correct insertion and firm fixing of the connection line. At the same time, avoid the occurrence of loose wiring or short circuit to prevent errors and potential dangers. 4 Protective Measures When using a three-phase voltmeter, the relevant protective measures should be followed to ensure the normal operation of the instrument and personal safety. This includes but is not limited to wearing insulation gloves, wearing insulation shoes, wearing goggles, etc. Especially when operating in high-pressure environments, take extra care and strictly follow the relevant safety specifications and operating guidelines. 5 Regular calibration and maintenance In order to ensure the accuracy and reliability of the three-phase voltmeter, regular calibration and maintenance are necessary. According to the frequency of use and environmental conditions, it is recommended to calibrate and check the three-phase voltmeter regularly to ensure the accuracy of the measurement results, and to repair or replace the damaged parts in time. As an important electrical measuring instrument, three-phase voltmeter plays a vital role in power system. It can accurately measure and display three-phase voltage values, monitor power quality, and provide alarm function. However, when using a three-phase voltmeter, it is necessary to pay attention to safe operation, correct selection of the range, attention to electrical wiring, protective measures, and regular calibration and maintenance.
