A leakage monitoring device
A monitoring equipment and monitoring device technology, applied in electrical components, circuit devices, parameter calibration/setting, etc., can solve problems such as circuit power failure, load equipment unable to work normally, and failure to protect life safety.
Active Publication Date: 2018-08-10
BEIJING ZY HONGTONG TECH +1
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Problems solved by technology
If the safety current threshold of the leakage protector is selected too small, the power supply will be cut off frequently. Although this can protect the safety of personnel who may have electric shocks, the frequent power cutoff of the leakage monitoring device will cause frequent interruptions in the circuit. power, causing the load equipment to fail to work normally
And if the above-mentioned safety current threshold is set too large, it will lead to failure to protect human safety.
Method used
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[0041]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making ...
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The invention provides a leakage monitoring device which comprises a monitoring device and a power failure device. The monitoring device is electrically connected with the power failure device. The monitoring device comprises a zero sequence transformer. A power supply wire which provides power for an electrical load is connected with the power failure device through a through-hole in the zero sequence transformer. The monitoring device is used to determine first induced current values sequentially outputs by the zero sequence transformer at every set time interval and calculate the difference between two adjacent first induced current values. When the difference is determined to exceed a set current threshold, a power failure control command is transmitted to the power failure device. The power failure device is used for powering off the electrical load when receiving the power failure control command. According to the embodiment of the invention, when the difference between two adjacent first induced current values is determined to exceed the preset current threshold, repeated tripping of the circuit breaker and electric shock hazard are avoided at the same time.
Description
technical field [0001] The invention relates to the technical field of safety monitoring, in particular to an electric leakage monitoring device. Background technique [0002] The leakage of electrical equipment is related to the problem of safe electricity use, and even directly affects personal safety. Therefore, it is very important to install leakage monitoring equipment in the power supply line. [0003] In the current engineering practice, the installation of "leakage protectors" is generally used to prevent electrical equipment leakage from harming personal safety. Taking the most common two-phase AC as an example, when the existing "leakage protector" leaves the factory, the internal circuit structure determines its safe current threshold. When the leakage current value detected by the "leakage protector" is greater than the protection current value , it will control the power-off. [0004] However, in engineering practice, especially in outdoor engineering, as the...
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IPC IPC(8): H02H3/32H02H1/00H02H3/04H02H3/00
CPCH02H1/0007H02H3/006H02H3/04H02H3/044H02H3/32
Inventor 姜杰陈洪生李蓬华李博陈磊
Owner BEIJING ZY HONGTONG TECH