A current transformer disconnection detection method and a measuring device
A current transformer and disconnection detection technology, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of misjudgment of current transformer disconnection and affecting the accuracy of current measurement, so as to improve accuracy and simple structure Effect
Active Publication Date: 2020-12-29
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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Problems solved by technology
In the above technology, the DC component used to detect the disconnection of the current transformer is a fixed voltage, and is always superimposed on the current signal conditioning circuit, which affects the accuracy of the current measurement to a certain extent
In addition, the current signal conditioning circuit usually includes electronic components such as resistors, capacitors, and operational amplifiers. Due to the influence of factors such as electronic component temperature drift and operational amplifier offset voltage changes, the DC voltage component output by the current signal conditioning circuit is often an uncertain value. , which makes it difficult to preset an accurate reference voltage in the microprocessor as a reference value for detecting and judging transformer disconnection, which may easily cause misjudgment of current transformer disconnection
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[0018] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0019] The measuring device of the present invention realizes the working principle of current transformer disconnection detection as follows: figure 1 As shown, it includes: an integration circuit for restoring the output signal of the current transformer, a signal processing circuit for amplifying the output signal of the current transformer, and a signal processing circuit for processing the output signal of the current signal conditioning circuit (including the integration circuit and the signal processing circuit) and A microprocessor that controls the superimposition of DC voltage components; an output terminal of the current transformer is sent to the signal processing circuit after passing through the integrating circuit, and the microprocessor performs A / D conversion and processing on the output voltage of the current signal conditioning circuit...
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The invention discloses a method for detecting disconnection of a current transformer. The output signal of the current transformer is sent to the A / D port of the microprocessor after the current signal conditioning circuit; the microprocessor carries out the A / D sampling that the sampling point interval time is T0 to the output voltage signal of the current signal conditioning circuit, and Calculate the current measurement value and the DC voltage component V0 according to the sampling data; between two adjacent sampling points of A / D sampling, the microprocessor inputs to the output terminal of the current transformer and the current signal conditioning circuit through its own I / O port A DC pulse level with a pulse width of T1 is injected into the terminal connection point, and the DC voltage component V1, T1 is extracted within the time T1
Description
technical field [0001] The invention relates to a method for detecting a disconnection of a current transformer and a measuring device with a function of detecting a disconnection of a current transformer. Background technique [0002] With the development of modern power electronics and computer technology, people put forward more new requirements for the function, performance and reliability of smart electrical appliances. The circuit breaker is an important component in the low-voltage power distribution system, and its integrated functions are becoming more and more abundant. In addition to the traditional three-stage protection, it also provides a variety of optional protection functions, rich measurement and maintenance functions. As the central component of the circuit breaker, the intelligent controller is the core to realize the intelligence of the circuit breaker. Among them, current measurement is the basis for circuit breakers to realize various measurements and...
Claims
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IPC IPC(8): G01R35/02G01R31/54
CPCG01R35/02G01R31/50
Inventor 殷建强叶文杰周龙明
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)