How to determine the phase sequence of the generator with a multimeter

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The line voltage of the three live wires of the winding is 380V, and the single-phase equipment of the mains is connected to the phase voltage of 220V between the live wire and the neutral line. Phase sequencer may be used for phase sequence: use the three-phase asymmetric load, and make the phase sequencer phase sequencer in the absence of a midline when the load voltage is not equal - a capacitor and two identical bulbs can be connected into a star, if the phase connected to the capacitor is set as phase A, the brighter bulb is connected to phase B, and the darker phase is phase C.

I haven't heard of the multimeter method, but it's probably a very creative idea.

In order to maintain the stability and reliability of the network in the power system, it is inseparable from the parallel operation between the grids.

To this end, the power sector stipulates four elements that satisfy the parallel of networks: equal voltage, equal frequency, same phase sequence, and same phase.

However, the factory needs to use dual power supplies to ensure the normal power supply. In installation and commissioning, it is often forgotten to bring a phase sequence table, and the method of detecting phase sequence with a multimeter is generally used to parallel the network.

Specific method: As you know, the juxtaposition in the power system is the juxtaposition of A, B, and C phases at the same voltage. We only need to set one side as the power supply side and the other side as the same side, and juxtapose the power side and the same side. When the other three juxtaposition conditions are satisfied, the phase sequence is not tested by the phase sequence table.

You don't need to be nervous, you can still use a multimeter to judge the consistency of the phase sequence of the power supply on both sides.

If the low voltage and the following are parallel, you only put the multimeter in the AC 500V or 750V gear, first set the three phases of A, B and C on the power supply side, and then use a meter pen to set the A phase on the power supply side, and use another meter pen to measure the A, B and C phases on the opposite side of the same period, at this time three different voltage values will be obtained, but there are two voltage values that are high and almost equal, and the other is low, so choose to measure the lowest value and the A phase on the power supply side is the same phase A. According to this method, the other B and C phases are measured separately, and finally the two power supplies at the same voltage are side by side. Of course, if the power supply on both sides of the high-voltage 10kV and above is parallel, while measuring with the above method, it is necessary to measure the secondary outlet line of the voltage transformer on both sides, and the selected voltage level should be in the AC 200V range.

At the same time, it is also necessary to check the wiring of the voltage transformers on both sides to prevent accidents when parallel occurs due to different phases.

The general multimeter does not have this function, but the clamp meter I used has this function, which is made in Zhuhai, and the brand I can't remember clearly.

Ordinary multimeters cannot distinguish phase sequences.

See Reference "IV. Experimental Tasks".

A simple phase succession indicator.

It's not the frequency, it's that the phase order is different, and the phase order is random.

Your generator is not connected to the grid with the mains, and the generator provided by the factory is strictly forbidden to be parallel to the power grid, otherwise it will be directly short-circuited, which is precisely because there is a phase difference, and the grid connection between different networks must have strict procedures to parallel when the potential difference is minimal.

There is no way to measure phase sequence with a multimeter, but your problem has nothing to do with phase sequence.

If it is a phase sequence, then it should be 380 V different