JP3154079U - Switch trip control blackout compensation circuit - Google Patents

Abstract

A power failure compensation circuit capable of ensuring a necessary switch trip duty and avoiding a spill accident by guaranteeing a control operation for a certain period of time even in the event of a loss of power supply to an SOG control device at the time of abnormality provide. A simple circuit consisting of a large-capacitance capacitor, a resistor and a diode is added to the DC power supply unit of the SOG control device to satisfy the startup operation when the power is turned on, and the DC power supply for a certain time even when the power is lost Maintain the voltage to ensure the control function. [Selection] Figure 1

Description

  The present invention relates to power failure compensation for switch trip control.

  In a high voltage section switch (PAS), trip control when a load is abnormal is performed by detecting a zero-phase current with an SOG controller. Usually, the power supply of the SOG control device is supplied from the transformer output on the load side from the section switch. If it is in a steady state, for example, even in a cable accident, the SOG control device operates normally, tripping the segment switch, disconnecting the load, and avoiding a spillover accident.

  However, when the load abnormality is in the power supply system of the SOG control device, the control power supply is lost, the SOG control device does not operate, the switch cannot be tripped, and a spillover accident occurs frequently. is doing.

As a solution to this problem, there is also used a method in which a transformer is built in a section switch and the output is used as a power supply. However, even in this case, the problem caused by the loss of the control power source cannot be solved.

In addition, as an improvement measure, there is a method of installing an uninterruptible power supply (battery etc.) in the SOG control device and backing up even if the control power is lost. It is not put into practical use because of the problem. Furthermore, there is a method of securing a power supply for the control circuit for a certain period of time after a power failure by using a large-capacity capacitor for the control power supply unit. However, it is difficult to secure a control function for several tens of seconds.

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High Voltage AC Load Switch with GR for Responsible Demarcation Point Technical Explanation Materials Togami Electric Manufacturing Co., Ltd. September 2000 Edition

  The problem to be solved is that the necessary switch trip control cannot be ensured due to the loss of the power supply of the SOG control device.

  The present invention adds a simple circuit to the DC power supply unit of the SOG control device to satisfy the start-up operation when the power is turned on, and ensures the DC power supply for a certain period of time even when the power is lost, so that the control function is activated. It is characterized by leaving.

  The switch trip control blackout compensation circuit of the present invention ensures the necessary switch trip duty by guaranteeing the control operation for a certain period of time even if the SOG controller power supply loss situation at the time of abnormality, and the ripple accident Can be avoided.

FIG. 1 is an explanatory diagram showing a power failure compensation circuit. Example 1

  The purpose of securing a control power supply for a certain period of time after a power failure was realized with a simple additional circuit in the existing control power supply DC section.

  FIG. 1 is a circuit diagram of an embodiment of the device according to the present invention, where 7 is a power input and 8 is a DC power output.

  The output of the rectifier circuit is smoothed in the pulsating flow by the capacitor 2 and output to the stable power supply unit through the diode 5. On the other hand, the rectified output charges the capacitor 3 through the diode 5 and the resistor 4. At this time, the rise of the control power supply does not affect the rise time determined by the capacitor 2 because the resistor 4 enters the series even if the capacitance of the capacitor 3 is large.

  When the power supply for the control device is cut off, the charged capacitor is discharged, and the voltage is supplied to the load for a certain time. Discharging starts simultaneously with the capacitors 2 and 3 through the diodes 5 and 6. First, discharging of the capacitor 2 with a small capacity is completed, but after that, the capacitor 3 with a large capacity continues to discharge and supplies a voltage to the load. For this reason, the discharge capacity is obtained by adding 3 to the capacitor 2. By selecting a large capacitance of the capacitor 3, the control function can be secured for several tens of seconds even after the loss of the control power supply. Note that the diodes 5 and 6 can be omitted if the DC load current consumption is small.

DESCRIPTION OF SYMBOLS 1 Control power supply rectification circuit 2 Smoothing capacitor 3 DC voltage holding capacitor 4 Series resistance 5 Diode 1

6 Diode 2

Claims (1)

  A power failure compensation circuit added to the DC power supply unit to satisfy the start-up operation at the time of power-on of the SOG control device, etc., and maintain the DC power supply voltage for a certain period of time in the event of loss of supply power, and to ensure control operation etc. .