SU144224A1 - Method for starting mechanical rectifier - Google Patents

Description

The invention relates to methods for starting mechanical rectifiers.

Various methods are known for starting mechanical rectifiers, including those containing commutating chokes with bias windings, an automatic safety margin regulator, and an automatic current regulator, by means of which the control angle of the magnetic angle is controlled.

However, the known methods for starting mechanical rectifiers are complex and not reliable enough.

The proposed method aims to simplify the start-up of rectifiers and eliminate the possibility of the occurrence of reverse ignitions during the start-up.

A distinctive feature of the invention is the use of a rectifier, an automatic safety margin controller, and an automatic current regulator for the purpose of excluding reverse ignitions of the bypass circuits of contacts; ballast load at zero magnetic steering angle, and then the magnetic current is set by means of an automatic current controller control in which opening of the contacts rectifier magnetization reversal occurs before completion of the switching choke entering the job.

FIG. 1 shows an electrical circuit for starting a mechanical rectifier according to the proposed method; in fig. Figure 2 shows a circuit for uncoupling the phases of a mechanical rectifier operating as a three-phase six-throttle rectifier circuit.

The contacts KV +, KS +, KS-mechanical rectifier serve to rectify the alternating current of the power supply, the transformer T.

No. 144224- 2 In each phase a, e, and from the secondary winding of the transformer T, the switching chokes Dra +, Dra-, Drv, Drv-, Drs, Drs- are switched on. Contact Ka connects the phase a of the secondary winding of a transformer with a positive busbar rectified current of the contact device.

Contact / (a- connects the same phase to the negative busbar of the rectified current. Similarly, the contacts of the other two phases are connected.

The busbars of the rectified current are connected in series with the smoothing, they are loaded with a SD choke. Ballast load Rg is also attached to these tires. Parallel to the contacts of the rectifiers, there are bypass circuits containing semiconductor rectifiers for sparking the mechanical rectifier in the normal mode, also used for starting the rectifier.

FIG. The 2 shaded rectangles show the duration of the closure of the corresponding contacts of the rectifier. Ua, Ue v. Uc is the voltage in three phases on the secondary side of the transformer T.

a is the control angle of the commutator throttles.

The numbers 1, 2, 3 and 4 denote the moments of switching on the rectifier, opening of the contact / Ca +, opening of the contact Kc and opening of the contact Kv.

The start is carried out in the following sequence. By means of an automatic safety margin controller (not shown in the drawings), before starting, the instant of opening of the rectifier contacts is established, corresponding to the work of the rectifier on the ballast load Kg- at a control angle of 0.i

Then, by means of an automatic current regulator (not shown in the drawing), which changes the magnetic state of the commutating chokes before their operation, in order to regulate the rectified voltage, the control angle is set to about 35 el. degrees

Therefore, in the established mode of operation of the mechanical rectifier, the opening of the contact of the phase coming out of work will occur within the control angle, i.e. during the remagnetization of the switching throttle of the switched phase.

Subject matter of the invention;

A method of starting a mechanical rectifier with a semiconductor: and valves in bypass circuits, characterized in that, in order to simplify the start-up and eliminate reverse ignitions by using the bypass circuits of the rectifier contacts, the automatic opening time of the contacts is set using operation of the rectifier to the ballast load at a zero magnetic steering angle, and through an automatic current controller establishes a magnetic control angle at which the opening The contacts of the rectifier occur before the end of the magnetization reversal of the commutating throttle entering into the work.

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