Multipurpose three-phase test device

Abstract

The invention discloses a multipurpose three-phase test device, and belongs to the field of measuring devices. The multipurpose three-phase test device is provided with a test bar. A left-phase contact probe, a middle-phase contact probe and a right-phase contact probe are arranged at the front end of the test bar and are respectively correspondingly connected with three signal input ends of a three-phase tester by wires; two telescopic sleeves are respectively arranged at two edges of a transverse rod at the front end of the test bar; the left-phase contact probe and the right-phase contact probe are respectively fixed onto the telescopic sleeves; the middle-phase contact probe is fixed onto a middle fixing portion of the transverse rod; the left-phase contact probe and the right-phase contact probe are fixed onto the transverse rod at the front end of the test bar, and the middle-phase contact probe is fixed onto the transverse rod at the front end of the test bar by the aid of a spring; the three-phase tester is fixed onto a handheld rod of the test bar. The multipurpose three-phase test device has the advantages that contact frequencies of operators and live equipment can be reduced owing to a three-phase test point simultaneous contact measurement mode, accordingly, work risks can be reduced for test persons, inter-phase short-circuit accidents can be prevented, and the multipurpose three-phase test device is beneficial to increasing the speeds of integral test work; the multipurpose three-phase test device can be widely used in the fields of three-phase electric signal tests for low-voltage power supply systems.

Description

technical field [0001] The invention belongs to the field of measuring devices, in particular to a three-phase phase sequence verification device used in a low-voltage AC power supply system. Background technique [0002] During the actual power supply operation of the power system, it is often necessary to measure the phase sequence of the three-phase AC power supply (commonly known as nuclear phase), for example, the grid-connected operation of the generator, the installation / wiring of the irreversible motor, the power factor meter, the three-phase The phase sequence of the three-phase AC power supply must be measured in advance for the installation of watt-hour meters and cranes / elevators, and the connection cannot be reversed. Therefore, checking the phase sequence is an important work step for safe power supply / use. [0003] As a separate low-voltage power supply for power transmission to users, pole-mounted transformers (commonly known as pole transformers) are very c...

AI Technical Summary

Problems solved by technology

[0008] 1. You must be close to the live equipment to perform the calibration and get the calibration results, and you cannot keep a safe distance of more than 30 cm from the live equipment for calibration, which is prone to low-voltage electric shock accidents;

[0009] 2. It is necessary to install three phase sequence meter clips on the three-phase switch knife of the order box in turn, but the three-phase line clip of the existing phase nuclear device is small in size, and the contact area with the switch knife is small during the measurement process, and It is easy to fall off. Once it falls off, the tester will have to contact the live equipment again, which increases the danger; and the phase-to-phase spacing of the three-phase switch blades of the existing ring box is only 8 cm, and it is easy to touch another phase by mistake during the calibration process. There is a short circuit between phases due to switch blades;

[0010] 3. Clean the connecting wires before each operation, eliminate the entanglement between the wires, identify and check the wires of each phase, which increases the preparation time and affects the progress of the entire test work

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