Adjustable multipurpose three-phase test set

Abstract

The invention relates to an adjustable multipurpose three-phase test set and belongs to the field of testing. The adjustable multipurpose three-phase test set comprises a test bar; the front end of the test bar is provided with a left phase contact probe, a middle phase contact probe and a right contact probe; the left, middle and right phase contact probes are correspondingly connected with three signal input ends of a three-phase tester; the three-phase tester is fixed to a handle of the test bar; two sides of a transverse bar at the front end of the test bar are provided with two rotary spring clamps, respectively; the left and right phase contact probes are fixed to the rotary spring clamps on two sides of the transverse bar, respectively; the middle phase contact probe is fixed to the transverse bar at the front end of the test bar through a spring. A measuring mode wherein three-phase measuring points are in contact at the same time is adopted, an operator contacts a live device fewer times, work is less dangerous for testing staff, interphase short circuit is avoided, the test set is suitable for test objects having different interphase distances, work preparation time is shortened, and testing speed can be increased. The test set is widely applicable to the field of three-phase power signal testing 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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