Correct installation and wiring of the hottest res

The correct installation and wiring of residual current residual current action protector

(1) the installation position of residual current action protector is improper:

generally, the auxiliary power supply of the selected protector is from the protected power supply, so the auxiliary power supply of the protector should be connected in front of the fuse, that is, the power supply protector fuse consumer, and cannot be installed behind the fuse. Once the fuse is blown, the protector will lose power and cannot act correctly in case of electric shock, resulting in an electric shock accident. For protectors without auxiliary power supply, do not use or visit to view more information

(2) the installation position of the zero sequence TA of the protector is wrong:

the shell grounding of the distribution transformer, the neutral line grounding and the lightning arrester grounding are all connected to a grounding device, which is usually called Trinity. The neutral line should first pass through the zero sequence TA of the protector, and then be connected with the grounding wire of the distribution transformer shell and the grounding wire of the lightning arrester for common grounding. If the neutral line grounding wire and the lightning arrester grounding wire are connected and then grounded through the zero sequence TA of the protector, it may affect the normal operation of the residual current operated protector in case of lightning

2 correct wiring of protector

in the low-voltage distribution system, the Protector + protective line protection method is adopted, which often causes the protector to misoperate or refuse to operate due to the wrong wiring, resulting in adverse effects. When this protection method is adopted, only the correct wiring can achieve the due protection effect

(1) when the neutral point is directly grounded and TN-C mode protection is adopted in TN system, the neutral line must pass through the zero sequence TA of the protector, while the protection line does not flow current during normal operation, and must not pass through the zero sequence TA of the residual current action protector

will affect the service life of the device

(2) as the power line without single-phase load is a symmetrical load, the neutral line should not pass through the zero sequence TA, and the three-phase protector can be used. Double pole protector shall be adopted for single-phase load circuit, and protective wire shall be added in TN-S or tnc-s mode

(3) for hybrid power and lighting lines, four pole protectors should be selected. If the TN-C system with the neutral point directly grounded and the protection line sharing with the N line is adopted, the pen line passes through the zero sequence TA, but the pen line behind the TA only plays the role of the working N line, and cannot be used as the protection line at the same time

(4) after selecting the protector, if the line needs to be repeatedly connected, it can be used for the change detection of metal and non-metallic materials such as product welding points, spring steel, steel wires, steel ropes, wires, etc., and its grounding point can only be selected at the input end of the working N line. For example, for the power circuit with three pole protector, because its N line does not pass through the zero sequence current transformer TA, there are no other requirements for the selection of repeated grounding

in addition, after using the protector, people have a weak understanding of the importance of other protective measures against electric shock, mistakenly regard the protector as the only safety measure, and relax the implementation of other safety measures, such as connecting protective wires or grounding wires, using insulating protectors, etc. Therefore, while promoting the installation of protectors, we should also implement the requirements of relevant regulations, do a good job in safety management, and correctly play the role of protectors in safety protection