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INVENTION
Russian Federation Patent RU2024152
Phase symmetrical POWER capacitor bank
Name of the inventor: Gorbatov Nikolai Markovich; Gorbatov Vladimir; Znamenskii Gennady Petrovich; Znamenskiy Vladimir G.
The name of the patentee: Nikolai Markovich Gorbatov; Gorbatov Vladimir; Znamenskii Gennady Petrovich; Znamenskiy Vladimir G.
Address for correspondence:
Starting date of the patent: 1993.02.01
Installation is used for reactive power compensation. Summary of the Invention: of the nine sections of identical blocks of single-phase capacitors connected in a triangle by successive association contacts, made a single multi-pole circuit of the contact points is five three-pole circuit breakers made the connection with the three-phase network.
DESCRIPTION OF THE INVENTION
The invention relates to a three-phase AC electric power and can be used in any industrial enterprise with a variable electric load to electric networks with voltage up to 1000 V to reduce capital expenditures and operating costs for the enterprise power supply system and improve the quality of electricity at the terminals of its load.
The closest to the technical nature of the proposed device is selected as a prototype, the device described in the inventor's certificate USSR N 1241349. The prototype contains the control unit and thirteen single-phase and three-phase circuit-level power capacitors. Each link consists of three identical single-phase capacitance capacitors connected in delta. By controlling the thirteen single-pole switches in the prototype device can receive five different capacities with the following values for the power levels of the capacitor bank in a fraction of the total installed capacity of all batteries Q n (0.20; 0.33; 0.50; 0.66; 1, 00) Q n; The advantage of this device is the possibility of obtaining a large number of power steps of the capacitor bank in the presence of only three condenser units.
The drawbacks of the prototype are: structural complexity of the control circuit; considerable difficulty managing operations; at all levels of power in the prototype device, except the first, power capacitors after their pre-discharge included a total nominal voltage of the network, which leads to increased power losses and switching currents and capacitors and shorten service life.
The most important requirements for devices of this type are the minimum loss of power when used in capacitors and power, increase the service life of power capacitors, reducing the switching current, the maximum simplification of the control circuit, the construction of simple automation systems. All these requirements are not satisfied with the prototype considered above.
The technical result of the proposed solutions is to reduce the energy losses in power capacitors and power; increase the service life of power capacitors; decrease in current switching and power switching equipment; simplification of the device structure and control operation; receiving from the device approximately the same power management levels; ensuring continuous operation in the device power capacitors with low voltage at their terminals.
In order to achieve a technical result in a three-phase symmetrical power capacitor bank containing a section of the same power single-phase capacitors connected in a triangle, and the three-phase switch for connecting the battery to the three-phase AC, two vertices of each of the three triangles connected to each respectively with the top of one of the two remaining triangles so that in the resulting large triangles, each face has three terminals and two capacitor banks.
The resulting triangles similarly coupled in a triangle, facet of which contains five terminals and four capacitor banks, wherein the clips are connected to the three-phase five-phase circuit so that the phase of one switch connected to the vertices of a triangle, another breaker pole is connected to the secondary terminals of the triangle faces third and fourth - respectively to the second and the fourth terminals in the order of reference in a predetermined direction from the vertex of the triangle, and the fifth - the terminals to the middle of the triangle, faces which connect clamps average received within the larger triangle.
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The drawing is a schematic diagram of the proposed device. In this device, three-phase nine identical units connected in a single phase capacitor triangle going on new ties electric multipole 9.Mnogopolyusnik 9 is connected with three-phase control keys 4, 5, 6, 7 and 8. All control keys are connected with a three-phase network 1, 2 and 3. The device allows you to five different levels of power three-phase symmetrical capacitor batteries at low voltage discrete on its single-phase capacitors. These facilities comprise the following shares of the total Q n battery installed total power: (0, 10, 0, 20; 0,38; 0,67; 1,0) Q n. |
The table shows the battery power at different state 4, the control keys 5, 6, 7 and 8. When the control is necessary to obtain ten stages is going to the second multipole same nine links, and after the first five steps are included in the same manner the following five keys control the second same multipoint-connected in parallel, and similarly to the first multipole.
The proposed device operates as follows. With the demand for reactive power capacitors first switched three-pole switch 4. Then all capacitor banks receive low voltage and battery capacity of the entire amount to 0,10 Q n. With the growth in the reactive potpebnosti battery power after the key 4 are closed sequentially keys 5, 6, 7 and 8. The entire battery power while gradually increasing, reaching at the closure of the nominal value Q n keys. In addition, each of the single-phase capacitor banks switched from the low voltage for the nominal.
The calculations showed that the use of the device in modern industrial plants increases the service life of power capacitors of about 1.5 times. At the same time, and reduced wear on switching equipment and reduced power losses. The result is a significant economic benefit with little or no additional capital expenditure on basic electrical equipment.
CLAIM
Phase symmetrical POWER capacitor bank containing a section of the same power single-phase capacitors connected in delta and three-phase switch for connecting the battery to the three-phase AC power, characterized in that the two vertices of each of the three triangles connected to each respectively with the top of one of the two remaining triangles so that received a large triangle, each face has three terminals and two capacitor banks obtained triangles similarly coupled in a triangle, facet of which contains five terminals and four capacitor banks, wherein the clips are connected to the three-phase five-phase circuit so that the phase of one switch connected to the triangle vertices, and the phases of another switch connected to the secondary terminals at the edges of the triangle, the third and fourth - respectively to the second and the fourth terminals in the order of reference in a predetermined direction from the vertices of the triangle, and fifth - a middle triangle terminals whose faces are joined average clamps resulting in a large triangle.
print version
Publication date 15.02.2007gg
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