CN103489599B - A kind of multistage continuous voltage regulating 12 pulsating wave rectifier transformer - Google Patents

Abstract

The invention relates to the technical field of rectifier transformers, in particular to a multi-stage continuous voltage regulation twelve-pulse rectifier transformer. The multi-stage continuous voltage regulation twelve-pulse rectifier transformer includes a voltage regulation side transformer and a rectification side transformer. The voltage regulation side transformer includes a basic winding, a phase shift winding, a coarse adjustment winding, and a fine adjustment winding. winding and a low voltage winding, the coarse tuning winding and the fine tuning winding supply power to the high voltage winding. In the present invention, the phase-shifting winding is arranged on the voltage regulating side transformer. Under the condition of the same capacity and the same efficiency, this connection method needs less materials, low manufacturing cost, low investment and high cost performance. At the same time, the present invention adopts the design of coarse and fine adjustment on-load voltage regulating switch for multi-stage continuous coarse and fine voltage regulation, and its voltage regulation is by using the coarse and fine adjustment on-load voltage regulating switch, which can continuously adjust the voltage to 47 to 95 levels without power failure Easy operation and high safety.

Description

A Multi-stage Continuous Regulating Twelve-pulse Rectifier Transformer

technical field

The invention relates to the technical field of transformers, in particular to a multi-stage continuous voltage regulation twelve-pulse rectifier transformer.

Background technique

The voltage regulation range of the power grid is generally ±10%, and the rectifier transformer used in the electrolytic smelting industry has a large voltage regulation range, generally 5%-105%. The non-excitation voltage regulating switch and on-load voltage regulating switch in the prior art are developed on the basis of ordinary positive and negative voltage regulation in order to meet the requirements of the smelting process in the smelting industry. That is to add a non-excitation voltage regulating switch on the basis of ordinary positive and negative regulation to realize 54-level to 70-level voltage regulation, so as to realize the technical requirements of large-scale voltage regulation. The on-load voltage regulation range is ±17, a total of 35 levels, plus the non-excitation voltage regulation switch can realize 2 × 35 = 70 levels of voltage regulation. However, when the voltage is adjusted from low voltage to high voltage (5%-105%), a power outage is required, which causes troubles for substation operation and smelting process, complicated operation and large investment in equipment.

In order to meet the requirements of the smelting process, a rectifier power supply composed of a rectifier transformer and a rectifier cabinet with low voltage and high current is required. When the rectifier is in operation, high-order harmonics will be generated, and the high-order harmonics will cause damage to the power grid. In order to suppress the damage of high-order harmonics to the power grid, it is necessary to increase the number of phase shifts of the rectifier transformer in the rectifier transformer, and to suppress the damage of harmonics to the power grid by increasing the pulse number of the system. The pulse wave generated by each phase shift of the large rectifier transformer is twelve pulse waves, and the twelve pulse wave large rectifier transformer is composed of a voltage regulating side transformer and two rectifying side transformers. In the prior art, in order to achieve the above pulse number, a phase-shifting winding is installed in the transformer on the rectification side, that is, the transformer on the rectification side is composed of a phase-shifting coil, a high-voltage basic coil, and a low-voltage coil, and the phase-shifting winding and the high-voltage basic coil are connected by a Z-shaped connection. Form six pulse waves. Forming twelve pulses requires two transformers on the rectification side, so two phase-shifting windings and high-voltage basic coils are required. Therefore, in the induction voltage regulation or self-coupling voltage regulation, the connection method of the windings to achieve high-efficiency twelve-pulse output requires a lot of materials, which leads to high manufacturing costs, large floor space, and large investment for rectifier transformers.

Therefore, aiming at the above deficiencies, the present invention provides a multi-stage continuous voltage regulation twelve-pulse rectifier transformer.

Contents of the invention

(1) Technical problems to be solved

A technical problem to be solved by the present invention is to provide a multi-stage continuously voltage-regulated twelve-pulse rectifier transformer with low manufacturing cost and low investment.

Another technical problem to be solved by the present invention is to provide a multi-stage continuously voltage-regulated twelve-pulse rectifier transformer capable of substation operation without power failure.

(2) Technical solution

In order to solve the above technical problems, the present invention provides a multi-stage continuous voltage regulation twelve-pulse rectifier transformer, including a voltage regulation side transformer and a rectification side transformer, the voltage regulation side transformer includes a basic winding, a phase shifting winding and a coarse adjustment windings and fine-tuning windings, the rectifier-side transformer includes high-voltage windings and low-voltage windings, and the coarse-tuning windings and fine-tuning windings supply power to the high-voltage windings.

Wherein, the coarse-tuning winding and the fine-tuning winding realize multi-stage coarse-fine continuous voltage regulation through the coarse-fine-tuning on-load voltage regulating switch.

Wherein, the phase-shifting windings are connected to form a triangle with extended sides.

Wherein, the rectifier transformer further includes an oil tank for placing the voltage regulation side transformer and the rectification side transformer.

(3) Beneficial effects

Compared with the method of setting the phase-shifting winding on the rectifying side transformer, the present invention saves one phase-shifting coil. Therefore, under the condition of the same capacity and the same efficiency, this connection requires less material, lower manufacturing cost, less investment, and higher cost performance. At the same time, the present invention adopts the design of multi-stage continuous voltage regulation by using the on-load voltage regulating switch. Simple and safe.

Description of drawings

Fig. 1 is the wiring schematic diagram of the multi-stage continuous voltage regulating twelve-pulse rectifier transformer of the present invention;

Fig. 2 is an arrangement diagram of the phase windings of the multi-stage continuous voltage regulation twelve-pulse rectifier transformer of the present invention.

Among them: 1: regulator side transformer; 2: rectifier side transformer; 3: magnetic circuit; w1: basic winding; w2: phase shifting winding; w3: fine tuning winding; w4: coarse tuning winding; w5: high voltage winding; w6: Low voltage winding.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figure 1, the multi-stage continuous voltage regulation twelve-pulse rectifier transformer includes a voltage regulation side transformer 1 and a rectification side transformer 2, and the voltage regulation side transformer 1 includes a basic winding w1, a phase shifting winding w2, a coarse winding w4, a fine winding The winding w3 is adjusted, and the transformer 2 on the rectification side includes a high-voltage winding w5 and a low-voltage winding w6. Winding w5 supplies power. The design of multi-level continuous voltage regulation by using the on-load coarse and fine voltage regulation switch overcomes the defect that the non-excitation voltage regulation switch needs to be powered off for substation operation. It can directly regulate the voltage when the transformer is running, which is convenient for substation operation and saves time. High operating efficiency. The voltage regulating side and the grid side are in an electromagnetic induction relationship, which avoids direct circuit connection with the grid side. In this way, the failure of the grid side cannot directly cause damage to the voltage regulating circuit and the secondary side. Moreover, the phase-shift voltage regulation increases the pulse number of the system, thereby inhibiting the damage of harmonics to the power grid, increasing the efficiency and improving the reliability of the rectifier transformer and power grid operation. At the same time, the rectifier transformer outputs to the rectifier side transformer 2 by adjusting the thick and thin windings, so that the voltage range of the secondary side of the rectifier transformer is large, and can realize 47 to 95 levels of continuous level difference voltage regulation.

The phase shifting winding w2 is arranged on the voltage regulation side transformer 1, that is, the voltage regulation side transformer 1 is composed of the phase shifting winding w2, the basic winding w1, and the coarse and fine voltage regulation windings. Since the rectifier side transformer 2 is composed of two transformers, the two methods of modulation induction voltage regulation and auto-coupling voltage regulation use one more phase-shifting coil material compared with the solution of the present invention, so the multi-stage continuous regulation adopted in the present invention The twelve-pulse rectifier transformer saves materials, has low manufacturing cost, occupies a small area, has small investment, and is cost-effective.

The connection mode of the phase-shifting winding w2 is the extension triangle connection, which requires less material than the Z-shaped connection method.

As shown in Figure 2, the windings of the voltage regulation side transformer 1 are set together on a magnetic circuit 3, from the inside to the outside of the magnetic circuit are: phase-shifting winding w2, basic winding w1, coarse-tuning winding w4 and fine-tuning winding w3.

The rectifier transformer also includes an oil tank for placing the voltage regulating side transformer 1 and the rectifying side transformer 2 . The oil tank is the supporting part of the oil-immersed transformer. The oil tank is filled with oil, especially industrial oil. Because the oil has good thermal conductivity, soaking the transformer in oil can dissipate heat for the transformer.

It can be seen from the above embodiments that the method of setting the phase-shifting winding on the voltage regulating side transformer of the present invention saves one phase-shifting coil compared with the way of setting the phase-shifting winding on the rectifying side transformer. Therefore, under the condition of the same capacity and the same efficiency, this connection requires less material, lower manufacturing cost, less investment, and higher cost performance. At the same time, the present invention adopts the coarse and fine adjustment on-load voltage regulating switch to carry out the design of multi-level coarse and fine continuous voltage regulation, and its voltage regulation uses the coarse and fine adjustment switch, which can continuously adjust the voltage to 47-95 without power-off operation, simple and convenient. High security.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation, although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified Or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention, all of which should be covered by the claims of the present invention.

Claims (3)

1. a multistage continuous voltage regulating 12 pulsating wave rectifier transformer, it is characterized in that, comprise pressure regulation side transformer and rectification side transformer, described pressure regulation side transformer is made up of basic winding, Phase shift winding, coarse adjustment winding and fine tuning winding, described rectification side transformer comprises high pressure winding and low pressure winding, and described coarse adjustment winding and fine tuning winding are to high pressure winding power;

Described Phase shift winding is coupled to extend-triangle;

The winding of described pressure regulation side transformer is sleeved on a magnetic circuit jointly, in magnetic circuit outward successively: described Phase shift winding, basic winding, coarse adjustment winding and fine tuning winding.

2. multistage continuous voltage regulating 12 pulsating wave rectifier transformer according to claim 1, is characterized in that, described coarse adjustment winding and fine tuning winding adjust on-load voltage regulating switch to realize multi-stage coarse and fine continuous pressure by thickness.

3. multistage continuous voltage regulating 12 pulsating wave rectifier transformer according to claim 1, is characterized in that, described rectifier transformer also comprises the fuel tank for placing pressure regulation side transformer and rectification side transformer.