CN103872929A

CN103872929A - Three-phase-input and single-phase-output electric desalting power supply

Info

Publication number: CN103872929A
Application number: CN201210550201.XA
Authority: CN
Inventors: 刘统华; 梁泽涛; 刘登峰; 刘建春; 肖根华; 李泓; 谢国宏; 刘晓燕; 王雪莲
Original assignee: China Petroleum and Natural Gas Co Ltd; CNPC East China Survey Design & Research Institute
Current assignee: China Petroleum and Natural Gas Co Ltd; CNPC East China Survey Design & Research Institute
Priority date: 2012-12-18
Filing date: 2012-12-18
Publication date: 2014-06-18

Abstract

The invention relates to a three-phase-input and single-phase-output electric desalting power supply. The primary side of the power supply is a three-phase-input side, and a 100-percent resistor is connected in series in a three-phase loop on the primary side; a secondary side is a two-phase-output side, different taps are arranged on a secondary high-voltage coil, and different output high voltages are selected through a selector switch K1 in order to adapt to different crude oil; secondary two-phase high voltage is turned into single-phase electricity of which one end is grounded and the other end is charged through an isolation transformer; single-phase high-voltage electricity is transmitted to a dual voltage rectifying silicon stack respectively, rectified positive half waves form an anode, and rectified negative half waves form a cathode. By adopting the three-phase-input and single-phase-output electric desalting power supply, the problem of three-phase imbalance of an electric desalting transformer is solved effectively under the condition that the electric desalting high-voltage electric field effect is ensured.

Description

A kind of three-phase input single-phase output electro-desalting power supply

Technical field

The invention belongs to crude oil electric dehydration, oil plant crude oil electric desalting field, particularly a kind of power source special for petroleum chemical industry Crude Oil electric desalting equipment.

Background technology

What crude oil electric dehydration and oil plant crude oil electric desalting all used at present is single-phase transformer, and single-phase input individual event output, mainly contains the AC electro-desalting transformer (patent No.: 97200623.0), alternating and direct current desalting transformer (the patent No.: 93246305.3), high-speed electric desalting transformer (the patent No.: 01201736.1), namely each transformer is only used two-phase electricity (A, B phase or other two-phase), other once being out of use mutually, output is the two poles of the earth equally, earth electrode of a belt electrode, or negative pole of a positive pole, along with oil field and oil plant more and more higher to the requirement of utilization rate of equipment and installations, it is three-phase transformer that urgent hope changes current electric dehydration electro-desalting single-phase transformer, but also need with original single-phase load, thereby solve the problem of three-phase imbalance and reduce the capacity of higher level's transformer, especially at oil property worse and worse in the situation that, electric dehydration electro-desalting transformer running current is also increasing, three-phase imbalance is also more and more serious, the load of upper level transformer is also increasing, three-phase input single-phase is exported such transformer and be can be good at addressing these problems, particularly platform at sea, because most offshore platforms electricity used is all sent out with generator, offshore platform used is higher to the requirement of three-phase equilibrium, do not allow to use powerful single-phase electric devices as electric dehydrator transformer, originally in order to meet large like this single-phase electric devices, have to select larger generating set, increase equipment investment.

Summary of the invention

The object of this invention is to provide a kind of three-phase input single-phase output electro-desalting power supply, its primary side is three-phase input, all alters and connect 100% impedance in the loop of primary side three-phase.Secondary side is two-phase output, has different taps on secondary high-pressure coil, selects different output high pressure, to adapt to different crude oils by selector switch K1.Secondary two-phase high pressure passes through isolating transformer again, becomes the charged single-phase electricity in ground connection one end, one end.Single-phase high voltage electricity is delivered to respectively to a voltage multiplying rectifier silicon stack, and the positive half wave that rectification goes out forms positive pole, and the negative half-wave that rectification goes out forms negative pole.

A three-phase input single-phase output electro-desalting power supply, is characterized in that being once input as three-phase as noted earlier, and High voltage output is single-phase;

A three-phase input single-phase output electro-desalting power supply, is characterized in that its transformer contains a voltage doubling rectifing circuit as noted earlier, is positive or negative high voltage electricity by single-phase high voltage electric rectification;

A three-phase input single-phase output electro-desalting power supply as noted earlier, is characterized in that all altering and having connect 100% impedance in three groups of coils of primary side of transformer;

A three-phase input single-phase output electro-desalting power supply, is characterized in that there is different voltage taps on second siding ring as noted earlier, can select different output voltages by selector switch K1.

A three-phase input single-phase output electro-desalting power supply as noted earlier, in the situation that guaranteeing electro-desalting high voltage electric field effect, has effectively solved the problem of electro-desalting transformer three-phase imbalance.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Explanation in Fig. 1:

A, b, c, transformer terminal

X1-U phase of impedance coil y1-V phase of impedance coil z1-W phase of impedance coil

X2-U phase step-up coil y2-V phase step-up coil z2-W phase step-up coil

High-tension coil after high-tension coil z3-z2 coil after x3-x2, y2 coil boost boosts

B-high-tension electricity, C-high-tension electricity A, o2-single-phase high voltage end

K1-voltage-selected switch R-voltage multiplying rectifier silicon stack

Fig. 2 is application schematic diagram of the present invention;

Explanation in Fig. 2:

1-transformer, 2-electro-desalting tank body, 3-anode electrode plate

4-negative el

Embodiment

Below in conjunction with drawings and Examples, content of the present invention is further elaborated.

First by the alternating current of the three-phase attracting from switchgear house, receive respectively on a terminal, b terminal, c terminal of transformer 1, a terminal, b terminal, c terminal are connected in series with U phase of impedance coil x1, V phase of impedance coil y1, W phase of impedance coil z1 respectively, and U phase of impedance coil x1, V phase of impedance coil y1, W phase of impedance coil z1 are connected in series with U phase step-up coil x2, V phase step-up coil y2, W phase step-up coil z2 respectively; U phase step-up coil x2, V phase step-up coil y2 share an iron core, U phase step-up coil x2, V phase step-up coil y2 form high-tension electricity B by iron core, W phase step-up coil is an iron core for z2, W phase step-up coil z2 forms high-tension electricity C by iron core, high-tension coil x3 place after x2, y2 coil boost connects selector switch K1 and is connected with high-tension electricity B end, and the high-tension coil z3 after z2 coil boosts is connected with high-tension electricity C end; It is that high-tension electricity A and one end ground connection are o2 that two-phase high-tension electricity B, high-tension electricity C form one end through isolating transformer; High-tension electricity A end is guided on voltage multiplying rectifier silicon stack R, positive half wave is delivered on the interior positive electrode plate of electrical desalter, negative half-wave delivers on the interior negative electrode plate of electrical desalter 24, positive-negative electrode plate will form high voltage electric field, by adjusting the position of K1 selector switch, select different output voltages, in electrical desalter, form ac high-voltage electric field (as shown in Figure 2).Because positive/negative plate is single-phase load, the electric current of transformer primary side three-phase electricity is identical, thereby has reached the object of balance.

Claims

1. a three-phase input single-phase output electro-desalting power supply, is characterized in that: its primary side is three-phase input, all alters and connect 100% impedance in the loop of primary side three-phase; Secondary side is two-phase output, has different taps on secondary high-pressure coil, selects different output high pressure, to adapt to different crude oils by selector switch K1; Secondary two-phase high pressure passes through isolating transformer again, becomes the charged single-phase electricity in ground connection one end, one end; Single-phase high voltage electricity is delivered to respectively to a voltage multiplying rectifier silicon stack, and the positive half wave that rectification goes out forms positive pole, and the negative half-wave that rectification goes out forms negative pole.