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The long-term station 110kV line with the system joins the linkage on both sides of circuit breaker protection measures

Flow is very small, current and voltage is approximately equal to the angle between vectors 9O. Three-phase symmetrical voltage and current remained clear that the amount of the current mutation of the mutation and the amount of phase angle as a criterion, we can determine the state of the system side of the circuit breaker in order to achieve power plant side of the circuit breaker side of the joint tracking system trip, l10kV Hasha line both sides of the manufacturers with a different distance protection device (GE plants produced for the U.S. side of the DLP-based relay, the system side of the plant Xuchang distance relay protection device), according to the above requirements device consisting of only one by one installed on the plant side of the export management of a local power breaker,[link widoczny dla zalogowanych], of the problem with Hunan Yongxing Power Plant in Chongqing turbine design and manufacture of GZ990 ~ WP A 500, SFWG12.5-68-5700, 12.5 MW bulb turbine group compatibilizer, the compatibilizer can be achieved throughout the unit, and generating capacity increase key to see the generators and ancillary equipment can meet the requirements. Capacity generator to achieve a power increase is apparent, one is active power up. Rehabilitation after l5 MW to meet the premise of active power, power factor increased from 0.85 to 0.95, can not meet the system's safe operation. To this end, the root of two. Since April 1994 has been put into operation, the unit performed well, basically to meet the design requirements. Power of the original design head 6.7 meters, and now through the end of the water and dredging will be increasing the height of the gate, the actual average head of 86 meters, 1.9 meters, the maximum head of 10 meters. Manufacturing unit,[link widoczny dla zalogowanych], due to the mold manufacturer reasons, a 15 MW turbine manufacturing, by 12.5 MW generator manufacturing. After the head increase the turbine structure strength and stiffness had no problems to meet the capacity increase requirements, as long as the generator can rate increased, the stator current increase. Consider the requirements of the control stator temperature, after the generator under the Capacity and Capacity Expansion of the total loss before the close of the principle of maintaining the power factor increased to 0.95 by the 085. Reduce the reactive power, reducing the rotor current,[link widoczny dla zalogowanych], winding temperature rise calculation results show that the stator temperature increase after compatibilization 6K, but reduced the rotor about 8K. Therefore, the overall thermal load on the rotor after the reduction of capacity increase, the temperature decreased, a slight increase in heat load the stator, one of the key technical innovation is to control the stator reactive power compensation, according to the principle of temperature, if maintained before and after the reactive compatibilization power constant, each machine needs reactive power compensation of about 26o0 kvar Seoul, after the capacity increase if the power factor by the same, then the reactive power compensation required for each machine 4366 kvar Rehabilitation Seoul This is the second generator key issues. Second, measures a temperature rise of Rehabilitation problems. SFG125-68/5700 type generator cooling system forced a double closed loop system, the entire system consists of water-cooled air-cooled parts and components. On the water part, the original unit is used around the spring air cooler, heat transfer area of 06 square meters, the unit cooling capacity of about 28 kilowatts, currently several main types of air coolers in the water pressure, water under the same circumstances, performance indicators such as the Table. The above criteria posed by the protection action logic diagram chart: box 1 is the angle generator. To strike a voltage U and current phase angle between I; Box 2 for the point of the comparator, when the UI of a 90. High output; box 3 box for the current threshold to determine when I (instantaneous fault current value) less than the minimum load current and less than the pre-fault load current I, then the output high; box 4 with the door When the input is high all the time, the output is high; Box 5 for the timer, the device operating time tv box tv = tg-At, tg over-voltage protection for the action generator question, Al for the protection action the time required for selective steps, l for the device reset time Is; figure the amount of input: u is l10k'v bus voltage, 3I for the line three-phase output current,[link widoczny dla zalogowanych], DL location for the circuit breaker contacts Third, the conclusion when the water long-term power system by a single connection back to when the incidents in the system side circuit breaker circuit breaker disconnect the power plant side of the table to keep the case closed, the operation of the generator due to capacitive current touch of self-excited effects help to make machine-side sharp increase in voltage, resulting in over-voltage protection action generator. Jump in electrical circuit breakers and switches off La. If two or more generators in the generator voltage bus on the side by side, and after a single-circuit lines on the main transformer and the connection with the system, the situation will be even more serious, because in the event of such an accident will cause the whole plant outage and led to disappearance of auxiliary power, auxiliary all outages,[link widoczny dla zalogowanych], so the time to restore power growth. Therefore, the required post-breaker in the system side (whatever reason) to be joint development of power plant side of the circuit breaker jump. But most of the line protection do not have this feature available to this device can properly solve the problem (Editor Xiu-Chi)
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