SU37775A1 - Mercury Rectifier Training Device - Google Patents

Description

Metallic heavy-duty mercury rectifiers undergo molding (training) before leaving the factory. This process usually consists in the fact that a mercury rectifier is more or less long-lasting, lits at a low voltage on the rheostat. In this case, the electrical energy absorbed by the rheostat is lost uselessly. Naturally, the desire to reduce losses in a rheostat to a minimum or completely get rid of these losses.

Two main methods are known for forming mercury rectifiers with minimal losses. Olin from the GNH is that the load for the mercury rectifier (instead of reissat is a motor-generator that converts i alternating current and alternating and sjsBenergy energy back into the network that feeds the forming transformer. Another method is that the alternating current source high reactivity is reported (for example, by means of chokes) and molding is carried out on a short-circuit mode of a direct current circuit or with a low-power rheostat.

Both of these methods have a significant drawback: they require equipment (252)

vani, designed for relatively high power (transformer, motor-generator, chokes, synchronous compensator, etc.). This is due to the fact that in order to ensure the ignition of the arc on the main anodes of the rectifier, the molding transformer must be performed for a phase voltage of 100-50 volts, while in order to maintain the arc it would be enough to have a phase voltage of the transformer of about 30 volts. The overvoltage of the forming transformer is the cause of losses in the rheostat and the high power of the equipment.

The proposed device for forming allows reducing energy losses during the formation of a mercury rectifier to a minimum and at the same time allows to reduce the power of a transformer transformer several times.

The essence of this device is as follows. The forming transformer is made to a secondary phase voltage, which is not convertible and sufficient for the arc (goss) in the rectifier. In order to ensure that the arc is ignited on (the main anodes in the Mercury rectifier circuit, between the anodes and the cathode, an additional source of constant voltage of small power is introduced.

HI of the enclosed figs. 1 depicts a device in compliance with the invention using a DC source; FIG. 2 - the same device using an AC power source.

Between the cathode of the rectifier 1 and the well .ifBoS point of the transformer 2 through the switch 7 and the limiting resistance 6 includes a source of direct or alternating current 5 (battery, machine or rectifier) with a negative pole to the cathode, and a positive to the zero point of the transformer. The voltage of the DC source 5 must be sufficient .1CH to ensure ignition of the arc on the main anodes of the rectifier in the presence of an arc on the excitation anodes (approximately 100-200 volts).

Resistance 3 - resistor load resistor. With the possibility of adjustment and appropriate selection of the secondary voltage of the transformer, this resistance can be dispensed with and, for forming the rectifier, the zero point of the transformer with the rectifier cathode is directly required.

Molding according to this method is carried out as follows. After the arc on the excitation anodes of the rectifier is ignited and the forming transformer 2 is turned on, close switch 7. At the same time, the zero point of the transformer will receive an increased positive potential (100-200 volts) with respect to the cathode, due to which the arc on that anode, which will have at the moment of switching on a greater positive potential with respect to the cathode. Next, du1a will move from the anode to the anode, as in the normal operation of the rectifier. The current passing through the anodes will be limited by resistance 6.

After closing the switch 7, the switch 4 is closed. At the same time, current flowing through the anodes of the rectifier will be due to transformer secondary voltage, transformer inductance and chokes, if any, a drop in the arc and resistance of the rheostat 3.

When the switch 4 is closed, the DC source 5 will be closed to the limiting resistance 6.

If during the molding, due to any reasons (for example, gas evolution), the arc on the main anodes goes out, then for its ignition it is enough to briefly open the switch 4, leaving the switch 7 closed.

Switches 4 and 7 can be made automatic.

A similar method of forming can be applied to any scheme of a forming transformer.

The subject matter of the invention.

Mercury Training Device

rectifiers using an additional current source, characterized by the use of one or more transformers 2, connected at low voltage by one of the known circuits of the r / g-phase system with zero point and phase voltage is much lower than the one commonly used for training, source of direct or alternating current 5 of small power, switched on through resistance 6 by switching off;) tech.ch 7 between the cathode of the mercury rectifier 1 and the zero point of the transformer 2 with the possibility of joking of the source 5 load resistance 3 by closing the switch 4.

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