Safe grounding resistance resistance analysis.

Ground resistance:

The important parameter to measure the state of grounding is the grounding resistance we are talking about. Grounding resistance is mostly suitable for small grounding. The resistance encountered when current flows from the grounding device to the ground and then flows to another grounding body through the ground. The size of the grounding resistance reflects the excellent contact between the electrical device and the ground. The large grounding grid should be designed with grounding impedance. The increase in area and other factors reflect the stronger the effect of the inductive component in the ground impedance

In the case of high-voltage to ultra-high voltage transformation, we should choose the ground impedance by abandoning the ground resistance. We should also consider the safety judgment to choose a more accurate and applicable inter-frequency measurement system to know the ground impedance. Data accuracy to ensure the safe operation of the power system and personnel safety, etc.

According to different equipment requirements, the safe value of grounding resistance should be:

Generally, the grounding resistance of the street lamp lighting system should be within 4 ohms in actual installation experience

Working protective grounding:

Generally, the ground current is small in the low-voltage system, which normally does not exceed 4 ohms. When the capacity is below 100 kA, the grounding resistance can be loose to not exceed 10 ohms.

The following are the standard specifications for grounding resistance:

(Independent lightning protection) should be less than or equal to ten ohms

(Independent safety protection) should be less than or equal to four ohms

(Independent communication work) Should be less than or equal to four euros

(Independent DC work) should be less than or equal to four ohms

(Anti-static grounding resistance) less than or equal to one hundred ohms

The joint grounding common grounding body should not be greater than the grounding resistance 1 ohm

Pingshang technology electronic component manufacturers: sales (SMD resistors, precision resistors, varistors), etc., complete categories and stable prices