The industrial electric hoist is a lifting device that uses a 380V supply voltage. This lifting equipment has a wire to connect to the ground. How to detect it? There are two methods to detect the grounding system of the electric hoist: the first one uses the electric meter to measure and measure, and the second one uses the clamp meter to measure the resistance. Testing.
(1) Measure with a power meter
It is mainly used to measure the grounding resistance of a point of the electric hoist.
(2) Detecting the electric hoist ground wire with a clamp-type resistance meter
The instrument will generate an AC voltage signal E, E is a known quantity, the instrument's current measurement coil measured a current value, which results in loop resistance E / I. If the instrument displays <10Ω, the ground resistance at this point can be judged (10Ω, if it is found that the instrument shows several tens ofΩ, it needs further measurement judgment. But if the instrument shows a very high value, you must check whether this ground wire is defective. If it is a TN-S system, it can be measured by using a clamp to clamp the ground wire, and if it is a three-phase, four-wire wire, repeat the grounding and the grounding of the power distribution system to form a loop, clamp the protective grounding wire, if it is a three-phase and three-wire wire, Direct measurement of the ground wire is ineffective because the power distribution is not connected to the electric hoist device, so the loop resistance can only be measured by forming a loop.
(1) Measure with a power meter
It is mainly used to measure the grounding resistance of a point of the electric hoist.
(2) Detecting the electric hoist ground wire with a clamp-type resistance meter
The instrument will generate an AC voltage signal E, E is a known quantity, the instrument's current measurement coil measured a current value, which results in loop resistance E / I. If the instrument displays <10Ω, the ground resistance at this point can be judged (10Ω, if it is found that the instrument shows several tens ofΩ, it needs further measurement judgment. But if the instrument shows a very high value, you must check whether this ground wire is defective. If it is a TN-S system, it can be measured by using a clamp to clamp the ground wire, and if it is a three-phase, four-wire wire, repeat the grounding and the grounding of the power distribution system to form a loop, clamp the protective grounding wire, if it is a three-phase and three-wire wire, Direct measurement of the ground wire is ineffective because the power distribution is not connected to the electric hoist device, so the loop resistance can only be measured by forming a loop.
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