Low-voltage detection system and method

A low-voltage detection and voltage technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of unable to collect power parameters, etc., and achieve the effect of complete functions, high measurement accuracy, and simple collection

Inactive Publication Date: 2012-07-18
上海久创电气自动化设备有限公司
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Problems solved by technology

The utility model adopts multi-point shielding anti-interference measures, so that the microprocessor technology can better control the function of the circuit breaker, but this technology cannot collect the power parameters of the fundamental and harmonic detection, and it can only be connected to the background , it is impossible to directly observe some operating parameters during the control process of the motor, such as speed, current, etc., and sometimes it is necessary to display control parameters such as the rotation time and rotation speed of the motor externally

Method used

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  • Low-voltage detection system and method

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Embodiment

[0028] Such as figure 1 As shown, this embodiment includes: relay output circuit 1, clock circuit 2, watchdog circuit 3, liquid crystal display and keyboard input circuit 4, switch value acquisition circuit 5, central processing unit 6, voltage processing circuit 7, RS485 serial port processing Circuit 8, power supply circuit 9 and current processing circuit 10, among which: relay output circuit 1 is electrically connected to central processing unit 6 through a transistor, clock circuit 2 is directly electrically connected to central processing unit 1, and watchdog circuit 3 is directly connected to central processing unit 1. The processor 6 is electrically connected. The liquid crystal output circuit 4 is directly electrically connected to the central processing unit 6, the switching value acquisition circuit 5 is electrically connected to the central processing unit 6 through the photoelectric isolation circuit, and the voltage processing circuit 7 is directly electrically conn...

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Abstract

The invention discloses a low-voltage detection system and method in the technical field of power monitoring. The system comprises a central processing unit, and a relay output circuit, a clock circuit, a watchdog circuit, a liquid crystal display and key input circuit, a switching quantity acquisition circuit, a voltage processing circuit, a current processing circuit, an RS485 serial port processing circuit and a power circuit which are connected with the central processing unit respectively. According to the device, an R485 serial port is adopted for networking communication, an MODBUS communication protocol is supported, and the device is a liquid crystal display multifunctional instrument for a real-time power monitoring system, which has the function of measuring power parameters such as harmonic voltage, harmonic current, current and voltage angle, voltage and current value, active power, reactive power and electrical degree at high accuracy. The low-voltage detection system has the advantages of small size, simple structure, modularized design, large liquid crystal display and the like.

Description

Technical field [0001] The invention relates to a device and method in the technical field of power monitoring, in particular to a low-voltage detection system and method. Background technique [0002] Voltage quality is of great significance to the safe operation of the power system. The excessively high harmonics of the power grid cause excessive voltage pulses in the power grid and affect the imbalance of the power grid, which seriously affects the electrical safety of the power industry itself and power users. With the development of the power system, many power components have developed slowly, such as power parameter meters. The current power meters on the market have low accuracy, poor performance, and power parameter meters without fundamental and harmonic detection functions. The needs of business modernization and the functional requirements of power automation control systems, such as power monitoring and dispatching systems, and SCADA systems. Even with the harmonic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 鲁成伟孙建华周冠军孔祥宗王雪清
Owner 上海久创电气自动化设备有限公司
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