Safety protection device of novel submersible pump

Abstract

The present invention provides a safety protection device of a novel submersible pump. A three-phase four-wire system 380V alternating current power source is employed for power supply, and a secondary end of a three-phase isolation transformer is connected with a first electric leakage protector, a second electric leakage protector, a frequency converter and a three-phase alternating current motor of a submersible pump in order; a neutral line N of the alternating current power source is directly earthed, the casing of the submersible pump is connected with a neutral line N' of the secondaryof the three-phase isolation transformer through a PU protection cable to form neutral protection. The three-phase isolation transformer is employed to separate a downstream system at the secondary side of the isolation transformer from an external power grid without the interference of the external power grid, the abnormal over-voltage impact of the external power grid can be released by a metalshielding layer connected with the earth to protect the insulation between the primary and secondary of the protection transformer. When the system is electrically connected with the earth due to generation of abnormal conditions, motion is preferentially triggered to cut off the power source so as to ensure that the electric leakage current passing through a human body is in a safety range to protect the life safety of the personnel.

Description

technical field [0001] The invention relates to a safety protection system for an AC380V submersible pump in a pool. Background technique [0002] In recent years, the domestic cultural industry has developed rapidly, and the waterscape fountain industry has also developed rapidly in the spring breeze of the times. Many fountain pools and paddling pools with actor participation have been newly built. more and more. Since AC380V is not a safe voltage, although the current electric shock protection system for submersible pumps reduces the risk of electric shock to a certain extent, its safety protection measures are often only aimed at the situation where the power supply voltage is maintained near AC380V, and operating overvoltage is not considered. and lightning overvoltage damage to electrical insulation cannot completely prevent the occurrence of electric shock accidents. Contents of the invention [0003] The purpose of the present invention is to provide a safety pro...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a safety protection system for an AC380V submersible pump in a pool; to solve the problem that current submersible pump anti-shock safety protection measures are generally only aimed at the situation that the power supply voltage is maintained near AC380V, and do not consider the impact of operating overvoltage and lightning overvoltage on electrical insulation In the case of damage, technical problems that cannot completely eliminate the occurrence of electric shock accidents. When an abnormality occurs that causes the system to be electrically connected to the ground, the priority trigger action will be triggered to cut off the power supply to ensure that the leakage current passing through the human body is within a safe range to protect the safety of personnel.

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