SU705583A1 - Device for smelting glaze on a-c power transmission lines - Google Patents

Description

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The invention of fire retardants to electrical engineering, namely, to the technique of heating power transmission lines, is intended for use in electrical networks of power systems.

A device for melting ice, containing an uncontrolled transducer l.

Ice melting with high current with the help of an uncontrolled converter does not provide a wide range of melting current changes.

The closest technical field is a device for melting the ice of an AC power line, which contains a controlled converter and a current regulator, connected via a phase regulator with a transformer for example 2.

The features of operating modes of static static converters of ice melting on power lines for transmitting direct current energy are associated with the difficulty of large control angles causing large surges of reverse polarity on the valves, which contributes to the appearance of reverse ignitions. In addition, in this case, the reeko will increase the consumption of reactive tissue ..

The purpose of the present invention is to increase the reliability and reduce the consumption of reactive materiality at a continuous flow rate. ke ice.

To achieve this goal, the device 2 for melting ice-cold aa transmission lines of alternating current additionally contains a controllable, converter and a current regulator, connected by a cut-off phase regulator to a voltage transformer.

Claims (2)

A new 9toM device is that it is equipped with a biasing pulse shaper, the output of which is connected to the current regulator input, and the input through the OR circuit is connected to the current regulator outputs, which subaccounts the signals to the control electrodes of the rectifying valve group, and {The machine is made in a circular pattern. The invention is illustrated in the drawings, where in FIG. 1 shows a diagram of an ice melting apparatus made in accordance with the invention; in fig. Figure 2 shows the dependences of the voltage jumps on the circular circuit valves without a bias pulse generator and with a former; in fig. 3 shows diagrams explaining the principle of operation of the device. A circular circuit is connected to the supply transformer 1 with an inverter group of valves 2 and a rectifying group of valves 3. The valves are controlled from the corresponding outputs of the controller. 4. Juice 4. The outputs 5 of the high voltage level controller group 4 are connected to the circuit OR 6, The output of which is connected to the shaper of the pulsing impulses 7. Its output is connected to the input of the current regulator 4. To the input of the current regulator 4 through the phase regulator 8 podkppkpa also the secondary winding of the voltage transformer 9. The circuit coming from the current measuring element 10 to p & -. current buzz 4, off. When the current measuring instrument Hoivf is disconnected, the organ -10 on the slots of the existing current regulator 4 has control pulses that are synchronized with the voltage of the phase regulator. The pulses between pulses are the same b1 and are equal to -y. In this case, the output voltage regulation can only be carried out using the phase regulator 8, which leads to simultaneous displacement of the control pulses of the control group of valves 2 and the output group 3. To reduce the back pressure jumps of such circular circuit valves, it should be reduced, respectively, the ignition angles are cL for group 3 and the delay fb are for group 2. From this point of view, for the optimum, Sl & Шf Жилф6МШW сШСУС nШS t в ( oC should be changed, preserved (U. With optimal regulation, the reverse voltage jumps on the entiles; were determined by the formulas: 05p2. UoBpiiT-H Ccosrf, (. " Here X j - inductive resistance of one phase of the switching circuit of a circular circuit;, - resistance alternating current transmission lines; Single - melter current; EJ, J - phase voltage amplitude at the secondary winding of a pigment transformer 1; and aer2 Maximum reverse voltage jumps determined by the rectifier and inverter groups of valves, respectively. ice melting current can be obtained simultaneously by increasing C and decreasing (b, or vice versa. The resulting surges in the reverse voltage were determined by the formulas:) (C05d .-% 1tR W oL aaccos 2v (- | -1 - In the whole range of outputs; resistances of the AC transmission lines power transformer 1 is connected, the calculated curves of figures 2a and b for X 10 ohms are shown on & voltage jumps with optimal control are less than with the existing control circuit. In the writeable circuit of optimal control, pulses from the outputs of the Binstalgment group 5 of the current regulator 4 in addition to the control electrode electrodes group 3 enters the inputs of the circuit OR 6 in order. 1U. U1. The output of the circuit OR 6 produces pulses with a follow-up period, and a biasing pulse driver is triggered, which outputs current pulses, for example, of a straight-line shape. The current regulator 4 devices; so that it does not work when the current in the measuring circuits is less than a certain setting current. Therefore, in the interval when the output of the biasing pulse current generator is OTcyT, the current regulator does not work. Immediately before the moments of arising venous pulses I, III, the inverter group of valves (in the existing control circuit) appears at the output of the driver 7; Lie current - In this case, the moments of occurrence of pulses 1, W, 5 are determined not only by the phase regulator but also by the current regulator. The angle offset is determined from the expression; ,,, N4% I. (Selecting appropriately Zf, it is possible to carry out optimal regulation of the circular pattern in the ice melting mode. Connecting to the outputs of the regulator gok, which feeds the signals to the control electrodes of the valve group operating in the rectifying mode, through the OR biasing circuit The pulses, the output of which is connected to the input of the current regulator, make it possible to increase the reliability of melting the ice using a circular pattern. A biased controlled converter and a current regulator connected through a phase regulator to a voltage transformer, characterized in that, in order to increase reliability and reduce the consumed reactive power, it is equipped with a biasing pulse former, the output of which is connected to the current regulator input , and the Input is connected via the OR circuit to the outputs of the current regulator, which feeds the signal to the control electrodes of the rectifying valve group, and the converter is made in a circular pattern. Sources of information / taken into account during the examination 1. Guidelines for melting ice on overhead transmission lines of the STSIET ORGRES, Moscow, 1969. 2. Henrich G. A., et al., Special modes of powerful static converters of ice melting installations on power lines Lviv, Vshtsa School, 1975. J zzzrncu i iTTTtr L :: ± i :: t tput.1 ofpZ 0.6 Q.S one 0.2 - FIG. 2 It ten TO 1 OM Ooffp, 2npa being a re-UralKoani UoSp.2 scheme in the presence of a displacing impulse pulse in 4oSp. in case of existence of the Ugspjitnpu Hujfi / HW ipopMufjoSarrreM bias regulation of bias pulses Ofi