Run experience for years domestic and internationally to make clear, promotion uses protector of leakage of electricity, to preventing casualty accidents getting an electric shock, prevent the fire accident that causes because of leakage of electricity, have apparent effect. Protector of the electricity that the article uses extensively leakage of electricity (protector of leakage of electricity of the following abbreviation) working principle and application make some of introduction.
The working principle of protector of 1 leakage of electricity
Protector of leakage of electricity basically includes detecting element (transformer of 0 foreword electric current) , intermediate link (include amplifier, comparator, take off buckle implement etc) , executive component (advocate switch) and a few parts such as experiment component.
4 lines make three-phase the sketch map of principle of job of protector of leakage of electricity of power supply system. TA is transformer of 0 foreword electric current, GF gives priority to switch, the cent encourage that TL gives priority to switch is taken off buckle implement coil.
It is normal to be being worked by protective circuit, did not produce leakage of electricity or the circumstance that get an electric shock to fall, law of husband of You Kexi carry on one's shoulder is knowable, through TA the voltaic photograph of side is measured and be equal to 0. Namely: 2 side of such TA do not produce inductive electromotive force, protector of leakage of electricity not movement, the system maintains normal power supply.
When leakage of electricity be producinged by protective circuit or somebody get an electric shock, as a result of the existence of residual current, through TA the photograph of each phase current measures side and be equal to no longer 0, produced residual current Ik.
Appeared to hand in in core change magnetic flux. Handing in change below magnetic flux action, coil of TL2 second side has inductive electromotive force to arise, link undertakes handle and be comparatived among classics of signal of this leakage of electricity, should achieve when booking a value, make advocate switch cent encourage is taken off buckle implement coil TL electrify, drive advocate switch GF automatic tripping operation, sever breakdown cable, realize protection thereby.
Use at single-phase loop and three-phase the working principle of protector of 3 thready leakage of electricity and this is identical, not give uncecessary details.
The limits of protector of 2 furnish leakage of electricity
The GB GB13955292 that State Bureau of Technical Supervision released 1992 " protector of leakage of electricity is installed and move " , make unified provision to protector of leakage of electricity of countrywide urban and rural furnish.
2.1 must install protector of leakage of electricity (switch of leakage of electricity) equipment and place
(1) belongs to I kind movable type is electric equipment and hand-held are dynamoelectric tool (I kind electric product, namely the prevents electrical shock protection to rely on equipment not only basic insulation of the product, and still include additional safe precautionary measures, be like) of product crust ground connection;
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