The heating element of the tubular experiment furnace is silicon and carbon rod. The three-phase three-wire system has better leveling degree. The tubular experiment furnace can automatically monitor and alarm when a phase load is open.
In conventional applications of tubular experimental furnaces, if the three-phase loads are completely balanced, the null lines cancel each other out to be zero, so the null lines are traditionally of much smaller diameter than the phase lines. Tubular experimental furnace for three-phase three-wire system phase modulation, when the phase shift Angle is less than 60 degrees, the zero line current is the sum of the three phase line current, three-phase load turns conduction, all through the zero line current, and completely unable to offset each other), the phase-shifting Angle of 60-120 degrees, zero phase current of line 3 to 1 times change, only when the thyristor turn-on and the three-phase load balancing in full, the zero line current is zero.
Therefore, the zero line must adopt the same line diameter as the phase line when the ordinary tubular furnace is the load. For load kilns with tubular experiment furnaces that change with temperature or aging degree, because they often work at a small phase shift Angle, the zero line should be thicker than the phase line, which is 2-3 times of the safe carrying rate of the phase line. Not only the zero line of the power supply transformer of the cabinet and tube type experimental furnace should be thick to ensure the safety of the zero line and avoid excessive loss of electrical energy on the zero line.
High frequency interference of tubular furnace
As the phase-shifting trigger of the tubular experimental furnace will cause strong interference in the frequency range of 1-100khz, the phase-shifting trigger should be installed in a position relatively close to the SCR, but the tubular experimental furnace should keep a certain distance from the power line, shorten the length of the trigger line as far as possible, and try not to line the trigger lines of different phases in parallel.
On 2018-08-08 11:45:46
