SU1415325A1 - Device for connecting a capacitor bank - Google Patents

Abstract

The invention relates to the tactics and can be used in ycTpoii for connecting three-phase capacitors bo, chip (I1 power. The purpose of the invention is reliable) to the electrical network. Capacitor baggage 4 ti is connected to a three-phase network of 7 9 T) ground-diode switches with battery pre-charging through diodes and current-limiting resistors 45 and 46 without current surges and without a constant voltage on the capacitors. 1l of what they use are charged 1nrstors 47 and 48 and a relay element 32 with four output pins 28–31, which, when opened, the battery disconnects all four main 10-13 and both charge thyristors. The positioning of the windings of the control trans- (the transformer and the transformer of the nanowire on one magnetic conductor will show the wall of readiness of the device to be connected, as well as the efficiency of the unified. Statistical 1a, and the parallel of the capacitance on the disconnected capacitors in , 1 is the reason for the absence of a constant current component on them. 1 and l. (C (L

Description

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I: i) () The attitude refers to the si.ieKTpoTcx-peak and can be used in a device KiV. 1I connect the main unit to the part of the legal 1.4 I and terphase capacitors of high power.

Purpose n; (gain reliability increase.

Pa cherzhe nredstav.tena nrintsinia; 1b- on the electrical circuit is proposed; devices for connecting a capacitor- Hoii battery.

The device contains pins 1 3 for nodes 1К) of phase capacitors 46, which are connected to pins 7 9 for connecting phase loads to the mains through the main thyristors 10 and II and n.lean counter-parallel to them additional- 101 thyristors 12 and 13. Conclusions 2 and 8 are connected directly. The two-key devices of the main thyristors I) and II key switches to the cathodes of the omnipotent 1I)) source () 14 and 15, the control elec- trotros.I) who | the 1st are connected respectively to the transformer windings 11 | and; and 17 current. Control circuits auxiliary - 1s.1yyy. tirisgo) s 14 and 15 are shunted by .iHo.uiMH 18 and 19.

 n () av luiye e. 1ECTR (.) Dy dog yul and those, H1,1, thyristors 12 and 13 are connected to the cathodes of auxiliary (), 1 tirisg (.) Ditch 20 and 21, control, 1 к) 111th electrodes of the co-fi nods-meHiii to their anodes through the elements 22 and 23: 1ade |). The anodes of all suppressor thyristors 14, 15, 20, and 21 are connected, respectively, by means of resistors 24 27 and output fines 28 31 pe; ieiiiioi4) of element 32 to the secondary windings t) of anformator 33 through a bridge, first bridges 34-37, on Outputs of which are usgan () in, lens, smoothing capacitors 38 41. Elements 20, 22, 26, 36, 40 and 21, 2.3, 27. 37, .41 are composed of blocks un |) aw, laziness, 11 °, lnite, 1 thyristors, and elements 14, IB, 18, 24, 34, 38, and 15, 17, 19, 25, 35. 39 b, the locks controlling the base 1P) and 1 thyristors.

The discharge resistors 42 and 43 are connected by one ends to pin 2, and the other ends to the cathodes of the main thyristors 10 and I. The relay menu 1 32 || cc, 1K) through the output circuit 44 feedback back to VC, switches 6, U) K () B, and 1 main and additional, P) thyristors. Terminals 1 and 3 (azoid condes) 1c of the 1K) dk mountains, 1 are respectively via the limiting resistors 45 and 4 () and charge thyristors 47 and 48 to the terminals 7 and 9 for power, 1К) phase loads. In 111avl to) Cie, the electrodes of the charge shristors 47 II 48 are connected, respectively, to the anodes of auxiliary thyristors 20 and 21.

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The device for connecting a capacitor battery operates as follows.

At the initial stage, conclusions 7–9 are iodine with the voltage of a three-phase network; the winding of the transformer 33 is nervous — under the linear voltage of the network; capacitors 38 - 41 are charged to the amplitude value of the voltage of the secondary windings of the transformer 33 via rectifying bridges 34-37; feedback circuit 44 is open; relay element 32 is disconnected and output circuits 28-31 open; main and auxiliary thyristors are closed; phase capacitors 4–6 are not charged.

When the output circuit 44 of the circuit 1) is connected, the relay element 32 is switched on, which locks its output circuits 28 31. At the same time, the control electrodes of the charge thyristors 47 and 48 are connected to a constant voltage according to the rectifying bridges 36 and 37 and capacitors 40 and 41 through resistors 26 and 27. Charging thyristors 47 and 48 BK: 1 and through them the current-limiting resistors 45 and 46 and capacitors 4 and 5 are charged to am11, the current value of the network voltage. At the same time, with the application of voltage to the driving electrodes of the primary and 1 thyristors 47 and 48, these voltages are applied to the delay elements 22 and 23, respectively.

The amount of the time delay of the elements 22 and 23 is set such that during this time capacitors 4 and 5 are charged to a voltage of about 0.95 amnitudnogo value of the network voltage. After the delay time has elapsed, the DC voltages are applied to the control electrodes of the auxiliary thyristors 20 and 21, which include and include additional thyristors 12 and 13. The terminals 1 and 3 of the capacitor battery are connected to the terminals 7 and 9 of the network through the primary windings of the transformers 16 and 17 current and additional thyristors 12 and 13, while charging circuits with charge thyristors 47 and 48 and resistors 45 and 46 are shunted.

At the time when the mains voltage reaches the value of the voltage on capacitors 4 and 5 and exceeds it, charging of these capacitors takes place through do11o: 1 tiryushchie thyristors 12 and 13 to amp, the value of the network voltage. The voltage on the main thyristors 10 and 1 1 at this m is zero and begins to propagate in the forward direction.

I. Current pulses charging the secondary windings of current transformers 16 and 17 are supplied to the control electrodes of the main thyristors 10 and 11 through resistors 24 and 25 and closed output peeps 28 and 29 of the relay, respectively; Mitym bridge 34 and 35 and smoothing capacitors 38 and 39. At the same time, the main thyristor K) and I connect the battery of capacitors 4-6 to the three-phase network without inrush current. After connecting the battery of capacitors 4-6 to the network, the rated currents of the current transformers 16 and 17 flow through it. Diodes 18 and 19 shunt control auxiliary thyristors 14 and 15 from reverse voltages. During the time when the relay element 32 is connected to the network by the output circuit 44 of the feedback, the output circuits 28-31 are closed, the auxiliary thyristors 14, 15, 20 and 21 are open, in control. The 1 st electrodes of the main and supplementary thyristors 10–13 have a constant voltage and the battery of capacitors 4–6 is connected to the mains.

When the feedback value 44 is opened, the relay element 32 and its output circuits 28-31 are disconnected, and thereby the control circuits of the main 10 and 11, additional 12 and 13, and charge 47 and 48 thyristors are simultaneously turned off. Moreover, those of these thyristors, which at the time of disconnecting the output fines 28--31 of the relay element 32 were energized, were turned off when the corresponding sinusoidal currents declined to zero and the capacitor battery 4-6 was disconnected from the network. The voltages on the capacitors 4 and 5 at the same time are equal to the amplitude of the mains voltage and then, as the capacitors discharge across the discharge resistors 42 and 43, they drop to zero.

The voltage on the disconnected capacitors 4 and 5 depends on which of the thyristors 10 and 11 or 12 and 13 were carried out at the moment when the output circuits 28-31 of the relay element 32 were disconnected. Because the probability that the main thyristors are conducting at that moment 10 and 11 or the additional thyristors 12 and 13 are the same, then the polarity of the voltage across the opening is statically equal. 1 capacitors 4-6 until the end of their discharge through the discharge resistors 42 and 43. This means that during the operation of the proposed device in the connection and disconnection mode of the capacitor battery according to the signal of the feedback output circuit 44 the capacitor voltage 4-6 is zero.

In addition, switching on the output feedback circuit 44 in series with the relay element for supply voltage ensures simultaneous disconnection of the control circuits of the main 10 and 11 and additional 12 and 1 3 thyristors, which reduces the time spent by the capacitors 4-6 under the constant voltage The same effect is also achieved by switching on the output circuits 28-31 of the relay element 32.

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in the thyristor control circuit 10 13 pa the output of rectifying bridges 34 37 and smoothing capacitors 38-41, since the latter do not discharge to control the electrodes of the thyristors 10 13 after disconnecting the relay element 32

The placement of the windings of the control transformer and the voltage transformer on one magnetic core increases the degree of readiness of the device for switching on, as well as the efficiency of control, which improves the operational reliability of the device.

Thus, the proposed device ensures the operation of a capacitor battery in its switching-on and opening modes - not only without current surges, but also without a constant component voltage on the capacitors, which increases their reliability and the device as a whole.

Claims (1)

Invention Formula A device for connecting a capacitor battery to a three-phase network containing two main thyristors, two additional thyristors connected counter-parallel to them, pins for connecting phase capacitors, the first and third of them are connected to the appropriate terminals for connecting phase loads, two charging circuits with current and chip chips and a power source, one with ends and one connected to one with the first and third terminals for connecting a phase copier } 1satorov, and others. - with terminals for connecting phase loads, main thyristor control units, including auxiliary thyristors, and a control transformer with rectifying bridges and smoothing compensators, the primary winding of which is included in the output feedback circuit, additional thyristor control units, including all thyristors and a voltage transformer with rectifying bridges and smoothing capacitors, characterized in that, in order to increase reliability, it is equipped with a relay element with four output circuits, and charging thyristors are included in the charging circuits, cat1) connected to current limiting resistors, the anode to leads for connecting phase capacitors, and a control electrode connected to the anode of auxiliary thyristors of additional thyristor control units, 1ho. 1 on the feedback circuit of the plug to the terminals for connecting the phase loads in series with the relay element, the output circuits of which are connected in series 1415325 56 but with auxiliary thyristors on the high voltage transformer and transformer During the construction of bridges with smoothing voltages, they are placed on common magnetic-magnetic capacitors, and the control-wire windings.