JPS59128792A - Method of controlling induction directly-heated core wire continuous heating machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling a large-capacity induction direct heating type continuous core wire heating machine.

The induction direct heating type continuous core wire heating machine heats the running core wire as a secondary short-circuit loop, so there is no residual voltage left in the core wire and there is no alignment caused by leakage current, and all the supplied power can be used for heating the core wire. The core wire heating machine is the most efficient among all the machines. However, since continuous core wires are used as part of the circuit, the sum of three phases is 0, and the current supply system is exclusively using single-phase AC power.

Large-capacity devices such as preheaters and aluminum wire annealing machines with a core wire size of 3257111N or more reach up to 200kW, and since it is undesirable for power distribution to supply single-phase power from a commercial power source, single-phase AC power is supplied using an MG or inverter. The current situation was that equipment costs were unavoidably rising because of the need to generate and supply this.

Figure 1 shows a wiring diagram according to the invention. Reference numeral 1 indicates a Scotto connection transformer, and reference numerals 2 and 3 indicate voltage regulators such as a Cyrisk phase control device. FIG. 2 shows an example of a configuration diagram according to the present invention, and 1 and 2 are A, respectively.

In the B zone induction transformer, 3 is a short-circuit sheave, 4 is an insulating sheave, 5 is a guide sheave, and 6 is a heated wire. For example, in the case of an aluminum wire annealing machine, the A zone is preheated to about 200°C, and the B zone is heated to an annealing temperature of 350°C. A
, B zone load distribution is mechanically controlled by the length of the A and B zone secondary short-circuit loops, and electrically by controlling the balanced power by changing the A and B zone temperature. It can be used as cargo. Figure 3 shows a general configuration diagram according to the present invention, and the part numbers are the same as in Figure 2. In the case of Figure 3, the f3 load distribution of both induction transformers A and B is balanced, so the three-phase side is also balanced. Figure 4 shows the phase of the voltage generated in the secondary short circuit loop (A
) is when three three-phase induction transformers are used, and the sum of the voltages is 0, which means that heating is not possible. (B) is a case where two of the three phases are used, but it does not provide a balanced load to the three-phase power supply. (q is according to the present invention and is a balanced load on the three-phase side.

As mentioned above, according to the present invention, it is possible to receive power from a commercial three-phase AC power supply as a balanced three-phase load for a high-power induction direct heating core pure continuous heating machine without using an MG or an inverter, thereby reducing equipment costs. can be significantly reduced.

[Brief explanation of the drawing]

Figure 1 shows a wiring diagram according to the invention. 1... Scotto connection transformer, 2, 3......
- Shows voltage regulators such as Cyrisk phase control. FIGS. 2 and 3 show examples of configuration diagrams according to the present invention. 1.2...Induction transformer, 3...
・・・Short-circuit sheet-4・・・・・・・・・Nursing sheave, 5
・・・・・・・・・Guide sheave, 6・・・・・・・・・
・Indicates the running wire to be heated. FIG. 4 shows voltage vectors for three types of control methods. (A)・・・・・・・・・Three-phase, (B)・・・・・・・・・
Single phase x 2, (q... Shows the case of three-phase balanced load according to the present invention. Patent applicant: TEPCO Co., Ltd. Representative Kenzo Ishimori Oni diagram and three-sided O 0122 diagram

Claims (1)

[Claims] In a secondary resistance short-circuit induction direct heating continuous heating machine that applies Joule heat, the preheating zone, heating zone or heating zone,
An induction direct heating type that makes it possible to receive balanced load power from a three-phase power supply by dividing the reheating zone into two zones, or by installing two induction coils and exciting each with an AC power source of a different phase. How to control a continuous heating machine.