Q96-PS Q72-PS Phase sequence indicator

Q96-PS Q72-PS Phase sequence indicator

Overview of Q96-PS Q72-PS Phase sequence indicator

Phase sequence indicator refers to a device for indicating phase sequence in polyphase AC distribution system. It is mainly composed of lamps and capacitors, which are used for shore power boxes, etc.

Principle of phase sequence indicator of Q96-PS Q72-PS Phase sequence indicator

The circuit of phase sequence indicator is shown in the figure. The phase sequence of the three-phase power supply can be determined by the brightness of the bulb. The point is n. Due to the symmetry of the power supply, it is conceivable that the symmetrical line voltage is supplied by the symmetrical star connected power supply.

It can be seen that the voltage of phase B is high, so the bulb is on. If the capacitance is phase a, the light bulb is phase B and the dark bulb is phase C.

In industry, there is an instrument called phase sequence indicator, which can help people judge the phase sequence of three-phase power supply and prevent the steering accident of motor and other loads. Its circuit structure is as follows:

Any one phase of the three-phase power supply at the user's end is the first phase, which is connected to the capacitor end of the Y-shaped load, and the other two phases are connected at will. At this time, the three-phase power supply is connected, in which the brightest phase must be the second phase and the dark phase is the third phase.

Indicating phase sequence in AC grid

Features of Q96-PS Q72-PS Phase sequence indicator

Ambient temperature rang; -25° C to +55° C Housing protection: IP42/52

Vibration strength: 0.7g

Operation voltage(phase to phase): 190- 440VAC

Frequency:50---- 60Hz

Power consumption: ≤2VA