What is the insulation resistance of an electric heating tube

What is the insulation resistance of an electric heating tube

Customers often ask such questions, and we provide answers to this question. The insulation resistance of heating elements is mostly required to be different, ranging from 0.5 megaohms to 2G ohms, which is possible

But the requirements are generally not too high. As long as it can be powered on, it can be used

Connect the electric heating tube to the power supply to reach the working temperature of the component and maintain it for 10 minutes before powering off. Complete the measurement within 1 minute after powering off. No forced cooling method shall be used to cool the components within this 1 minute period.

Insulation resistance measurement (clause 4.3.4)

This experiment uses a 500V megohmmeter to measure du. During the experiment, the component casing and the megohmmeter should not form a loop through the earth structure to avoid affecting the measurement accuracy. At the same time, the impact of the environment on measurement accuracy should be considered.

The megohmmeter should be connected between any lead out rod of the component and the casing.

5.8.1 Cold insulation resistance and insulation resistance measurement after sealing test

5.8.1.1 Cold insulation resistance measurement should be conducted 24 hours after providing the components. During the experiment, it is allowed to use a megohmmeter higher than 500V but not exceeding 2000V for measurement.

5.8.1.2 Insulation resistance measurement after sealing test should be completed within 30 seconds after the sealing test.

5.8.2 Measurement of thermal insulation resistance

The test should be conducted when the component is at operating temperature. The working temperature can be determined by referring to the method specified in Article 5.6.1.

What is the size of the wire used for a 70 kW heating tube

Such a large power basically requires three-phase four wire power supply, with a current of approximately 140 amperes for 70 kilowatts. Economically, 50 square copper wires can be used, and the main switch uses 160 amperes. A current of approximately 60 amperes per 30 kilowatts can be used with 16 square copper wires, and 80 amperes per main switch. For specific information, please contact our online customer service and calculate directly.

The three-phase current of 72 kW is approximately 144A, and YJV3 * 50+1 cables can be used

A current of 6-8A per square meter means that 35 square meters have bai35X6A=210A, or even larger. The voltage is 380V, the current is 210A, and the power is 79800 watts, which is not much different because I calculated it based on a current of 6A per square wire. Nowadays, most power lines are not limited to this number.

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