24h automatic switching capacitor control circuit

This control method is to put in (or cut off) some or all of the compensation capacitors according to the time program according to the 24-hour reactive load variation curve of the system
. This method has simple control equipment and easy operation, and can prevent reactive power from being transmitted back to the power grid. However, since this control method
uses time as the basis for adjustment, it is only suitable for situations where the load is relatively stable and the reactive load changes regularly.
    The picture is a control schematic diagram for automatically switching capacitors according to day and night time. The control device can be
controlled manually or automatically through the switch 5A . Now a simple analysis of its automatic switching process is as follows:
    When the electric clock contact is closed, the operating power supply is connected to the closing time
relay The normally open contact of 1KT closes after the delay A#. At this time, the closing coil YO is energized and the compensation capacitor is put into grid operation. After that
, the electric clock contact is disconnected and the process of putting in the capacitor is completed.
    When the electric clock reaches the specified cut-off time, the contacts are closed, the coil of the tripping time relay 2KT is energized, and its normally open contact
is closed , and the operating power supply passes through the transfer switch, the contacts of the tripping delay relay, and the closing The contact m of the coil energizes the trip coil YR. At this time, the
normally closed contact in the YO branch of the closing coil is disconnected, and the closing coil loses power, which means the capacitor is cut off from the power grid.
    If the system is in a fault condition and the compensation capacitor is required to be disconnected, the relay protection part is turned on to energize the intermediate relay coil. In this way, the normally open contact
of KM is closed, causing the trip coil YR to discharge electricity and remove the compensation capacitor from the power grid. Cut off. This automatic electrostatic capacitor switching device   controlled by an electric clock is simple and reliable, does not require expensive equipment, and is low in price. Therefore, it has practical promotion significance in factory power supply systems. '