In the process of using silicone heating wire, there will be undesirable phenomena such as core wire breakdown, damage, and core breakage. Silicone heating wires are usually made up of a combination of core wires with a smaller cross-section. In the process of production, installation and use, it is easy to be affected by external forces and has a short circuit, resulting in the wire can not be used normally, so next Xiaobian takes you to understand how to detect the short circuit of the silicone heating line.
First, how to detect when the silicone heating line is short-circuited
1. The silicone heating line can be detected from the energized capacitance method, but this method is not recommended. The specific step is to determine the break point by constantly energizing the capacitance comparison. The temperature resistance of silicone heating wire is a little different from that of the outer material. There are roughly three types of PTFE: PTFE (PTFE) non-stick coating can be used continuously at 260, the maximum use temperature is 290-300, the friction coefficient is extremely low, the wear resistance is good, and the chemical stability is excellent. The disadvantages of this method are very obvious. First, it's time-consuming. Second, the silicone heating wires that have long been formed, such as shielding, assembly and sheathing, are completed, and it is difficult to find breakpoints.
2. The induction voltage method is to connect a 650-volt AC voltage into one end of the broken core of the silicone heating line, and ground the other side with other cores, and then test with an induction pen that can emit optical signals (light). During the test, the signal changes when the induction pen slides over the damaged core, so that the breakage point of the silicone heating wire can be accurately found. Silicone heating line FEP: FEP (ethylene fluoride propylene copolymer) non-stick coating melts and flows during the baking process to form a non-porous film with excellent chemical stability and excellent non-stick properties with a maximum application temperature of 200.
3. The capacitive method and the induction method are combined, usually under the premise that the silicone heating line is not shielded and sheathed (inspection and testing). Silica gel heating wire has excellent corrosion resistance, basically insoluble in any organic solvents, can resist oil, strong acid, strong alkali, strong oxidant and so on. It has excellent electrical insulation performance, high voltage, low and high frequency loss, no moisture absorption, and large insulation resistance. It has excellent flame retardancy, aging resistance and long service life. First, use capacitance test to find the approximate position, and then use the induced voltage method to accurately find the breaking point, this method is currently a common method used by silicone heating wire manufacturers.
4. The combination of constant current source and bridge method can be used to detect molded silicone heating line. First, use a constant current source to burn through the insulation at the broken core of the silicone heating line, and then use a bridge fault locator to accurately locate the fault point, which is also a commonly used silica gel heating line short circuit detection method.