| 摘要 |
The present invention relates to a power supply state automatic recording system having a separate sensor and, more particularly, to a power supply state automatic recording system having a separate sensor, wherein a current sensor circuit, which comprises two inexpensive zero-phase current transformers and one current transformer, is used such that a single power supply state automatic recording system can be used for multiple sub residual-current circuit breakers; even if the residual-current circuit breakers fail to operate, it is possible to check the power supply state easily through a capacitor, which stores preliminary DC power in a PCB substrate inside the power supply state automatic recording device; and a surge current or the corresponding date and time, for example, can be easily checked through a surge current measurement circuit and an RTC. The present invention provides a power supply state automatic recording system having a separate sensor, comprising: a residual-current circuit breaker connected to a power supply input terminal; and a power supply state automatic recording device having a separate sensor, which is coupled between load equipment connected to a power supply output terminal. The residual-current circuit breaker comprises: a single main residual-current circuit breaker for activating a trip driving unit according to a leak current, which is generated in a main power supply line, thereby shutting the main power supply off; and multiple sub residual-current circuit breakers connected to sub power supply lines, which branch off from the main residual-current circuit breaker, so as to activate trip driving units according to leak currents, which are generated in the sub power supply lines, thereby shutting the sub power supplies off. The power supply state automatic recording device having a separate sensor, which is connected to each sub residual-current circuit breaker, comprises: a transformer for electrically insulating between a primary winding and a secondary winding such that, even if a high voltage flows in a power supply line due to noise or an electrical leakage, the high voltage is not introduced; a DC power supply unit for converting AC power in the power supply line to DC power and supplying the same to each circuit and a microprocessor; a current sensor circuit comprising two zero-phase current transformers (ZCT) and one current transformer (CT); an electric leakage detection circuit for detecting an electric leakage, which occurs in the power supply line, through the zero-phase current transformers; a leak current measurement circuit for measuring the amount of current that leaks from the power supply line through the zero-phase current transformers; a surge current measurement circuit for sensing lightning or an instant overcurrent or overvoltage in the power supply line through the zero-phase current transformers; a used current measurement circuit for measuring the amount of current used in the power supply line through the current transformer; a surge voltage measurement circuit for sensing lightning or an instant overcurrent or overvoltage through the current transformer; a RTC (real-time clock) for measuring the date and time and transmitting the same to the microprocessor; a capacitor for storing preliminary DC power in a PCB substrate inside the power supply state automatic recording device such that the power supply state can be instantly grasped even during a blackout; a display device for displaying in real time the accumulated numbers of sensed blackouts, electric leakages, and surges, the leak current, and the used current and surge current measured through the current transformer; and a microprocessor for conducting controls such that accumulated numbers of blackouts, electric leakages, and surges of power supplied to the power supply line, which are sensed by respective measurement circuits, are stored in a non-volatile memory and displayed on the display unit, the surge current measured by the surge current measurement circuit, the leak current measured through the zero-phase current transformers, the used current measured through the current transformer, and information regarding the date and time transmitted from the RTC are stored in the non-volatile memory such that the same can be checked in real time, and are displayed on the display device. |
