SU603008A1 - Device for discrete regulation of network voltage phase shift - Google Patents

Description

(54) DEVICE FOR DISCRETE REGULATION OF PHASE SHIFT VOLTAGE NETWORKS

t} .1lis; formats}) s can be attached to the output.

With a chain of speeds, controllable silt pop elements are used as handshakes,

One of the transformers can be selected at full load power. Transformers can be made with different transformation ratios. FIG. 1 is a circuit diagram of the device described, FIG. 2 - vector diagrams following his static composites. The proposed device provides for the transformation of a three-phase voltage supply system; (id, ib, is) to two three-phase systems of output voltages (tr;, Ug, i, and a, between which a phase shift ipi 180 can be established. Windings of the first transformers are marked with indices ", windings of the second are fc. Beginnings And the ends of the windings are, respectively, the letters I and K, index - primary windings, index 2 - secondary ,, control windings, - g. Pervichye windings of transformers are connected in one direction, 1.d i., sy ijicA iftifCM are connected to the voltage pi The primary connection windings are shown in a triangle, but they can also be connected into a star. The secondary windings of the transformer are I-A in a triangle, to each vertex of which, besides the beginning and end of the windings belonging to the two phases of the transformer ft, are connected to the middle point of the terminal gradually and according to the secondary windings remaining; transformer phase. about. . The output voltages and, Ui, U, are counted from the ends, a (, tr2, u2) from the beginnings of the secondary windings of the transformer relative to point o. The shorting of the control windings of the transformer of the o4 format is carried out with switches I I, shorting of the control windings of the transformer and switches B '. The switches B / and B are controlled by the control units of the CU. The phase shift values between the three-phase output voltage systems, equal to O, are established by shorting the transformer control windings. "4, the phase shift value equal to 180 transformer, f The control terminal circuit provides the first working COCTOSUIHH devices, eliminating the possibility of simultaneous switching on

four

There are two switches, and one transitional, in which no switch from the switches is turned on.

Claims (1)

Fig. 2a shows a vector diagram of the output voltages for a transition state in which the control winding is not shorted in any of the transformers. Between the coupled output stations (11d and Od, Ug MU4,) of the device, in the transition state, some stop 0 is established. With the same resistance of the magnetization circuits of transformers. e and the applied voltages are distributed equally between their primary windings. If at the same time, Kae V -CGT I / X-W G5KVS, then in idle mode & FIG. 2a the state of the device is not working, but its use can be iienec6o3pa3HbiMii in some special modes (for example, during short circuits in the line). Fig. 26 shows a vector diagram of the b-voltages of the device when the control windings of the transformer "C" are short-circuited. At the same time, the resistance of the magnetizing circuit of the transformer X.: shunt ruets by the short circuit circuit, in, where the voltage of the Id, with the help of, is practically attached to the primary windings of the transformer 1. The primary and, consequently, the secondary voltages of the transformer are The bits {to zero, and the phase shift between the coupled output voltages are almost equal to O. In FIG. Fig. 2a shows the vector diagram of the stress during short-circuiting the winding of the transfusion tube. . In this case, the phase locking between the couplings and the output voltages is equal to 1ВО. Obviously, with such a relationship between the transformation ratios of the transformers X and jb (Kj Vj K), the output voltage modules at the O and ISO phase shift are the same. Since the device being described has only two operating states of 5TO control of such devices installed at opposite ends of the PII, their work is synchronized according to the maximum simple scheme of thermal control & When shorting the control winding of the transformer, the transformer carries the load and vice versa. The expediency of setting the phase shift to O or 18O is determined by the amount of power transmitted through the line. Thus, in the low-speed running mode and low loads, the phase shift angle Of, and in the heavy load mode, 180 is required. The load at which the transmission needs to be transferred from the operating mode with a phase shift of 0 ° to the operating mode with a phase shift of 180, technical and economic calculation. The analysis shows that the value of this load is approximately two times less than the maximum power transmitted by the line. Therefore, the power of the transformer ji can be two times less than the maximum power transmitted by the line. Consequently, the power of the transformer can be two times less than the power of the transformer OS, calculated on the maximum load. The total installed power of the device is thus approximately equal to multiple times (and not three times as the prototype) the value of the maximum transmitted power. Under real conditions, the residual ones on the windings of short-circuited three formers are different from zero, which is caused by the presence of active resistances and resistances of dispersion of the working windings and control windings. Therefore, setting the values of the phase shift angle. O and 180 is carried out with a certain degree. If the copper volume of the short-circuiting control winding is equal to the copper volume of the secondary working winding of the transformer (or two secondary windings of the transformer, then the residual voltage on the primary and the short circuit of the short-circuiting transformer at nominal load is equal to LTj / "Energy loss in the control circuit is equal to active loss copper secondary windings of a short-circuited transformer. Under the conditions of maintaining power transmission modes of increased capacity, equipped with transforming devices, and The oL transformer is in the idle (shorted) state with a load from zero to some value equal to the transformer power. Therefore, the control winding of the transformer of the operating system is lightweight. The ratio of the number of turns of the operating windings and control windings is determined by the operating parameters of the switches, In the particular case if the mains voltage and the load current of the primary windings of the transformer device correspond to the operating voltage and the operating current of the switches, the latter are connected to the primary th windings of the transformers. In this case, there is no need to use control windings, and the dissipation resistance and resistance of the primary windings of the short-circuiting transformer are eliminated from the load circuit, which increases the overall efficiency and improves the load characteristics of the device. In some cases, it may be appropriate to increase the voltage in the power transmission lines with increasing load. This can be achieved if you choose the transformer ratio of the transformer, which is larger than the transformer ratio of the transformer R, which is Уз a). 2 A / V3r Thus, the proposed transformer device allows, depending on, the load, shorting the shorting of the control current of one or another transformer, to transfer the power transmission capacity from the mode in which between the voltages applied to close wires, set phase shift 0 to 180 phase shift mode and vice versa. Claim 1, Discrete Phase Shift Voltage Device, a network consisting of two multiwinding transformers, entirely due to the fact that, in order to increase the reliability of power supply to the consumer and simplify the control system, the primary windings of the transformer phases of the same name are connected between for example, sequentially and according to, and form, for example, a triangle, the secondary windings of one of the transformers are connected in a triangle, to each of the vertices of which are connected by a common point connected and according to the secondary windings, the phase of which coincides with the phase of the secondary winding, opposite this vertex, 2, Device pop, 1, differing from the fact that each of the transformers is equipped with control windings, perelyuchennymi through the switches to the control lock, 3, Device pop , 1, otpich loe e with the fact that, with a circuit to improve the load characteristics, parallel to the primary windings of transformers are connected off, 4, The device according to claim 1, the difference e with the fact that, with a cel-increase