Overview of the main protection configuration scheme for internal fault of No.1 generator of Three Gorges Power Station

Overview of the main protection configuration scheme for internal fault of No.1 generator of Three Gorges Power Station

Incomplete longitudinal difference between adjacent phases, two branches, two branches, two females, adjacent connections, interphase connections, adjacent connections, interphase connections, two branches, two female branches, adjacent connections, interphase connections, adjacent sets, adjacent adjacent Adjacent phase-to-phase phase-to-phase inter-phase sag cross-difference two adjacent branches between adjacent adjacent phases, each branch is adjacently connected, phase-to-phase connection 22 is combined with adjacent adjacent gorge power station No. 1 generator internal fault main protection configuration plan Guilin Wang Xiangyu Zhang Xueshen 21.; Top Ten 4 Motor Systems. Beicheng 184; 1 Xuchang Relay Research Institute. Henan Xuchang 46 to be right, the power station No. 1 generator stator windings interphase short circuit a total of 49, the maintenance of the material 7 comprehensive analysis and calculation contact can be selected with the same component cross-section protection crack phase cross-section protection incomplete differential protection and complete The differential protection is based on the full demonstration of various protection sensitivities. The total configuration of the internal deep protection of the generator is proposed. 1.

1 generator basic condition short circuit number 540; total number of short circuit at the intersection of the stator winding end line 1095 per phase parallel branch number, remember the total slot of the tank under the same slot, the main protection of the main unit of the line bar 2 name protection scheme Total number of faults Sensitive action number Interturn short circuit Same branch Different branches Interphase short circuit Possible action number Interturn short circuit Same branch Different branches Interphase short circuit Inoperable number Interturn short circuit Same branch Different branches Interphase short circuit element Cross section I Crack phase cross Short circuit same different branch branch sensitive action number inter-turn short circuit same branch different branch phase-to-phase short-circuit protection scheme two branches adjacent connection incapable action number phase-to-phase short circuit two sets of cross-difference two sets of cross-difference 12 combination of 2 combination 5 times electric hunger open network Mussels soft to the barriers of various protection schemes Sensitivity phase-to-phase short-circuit short-circuit short-circuit same branch different branches branch adjacent connection phase-to-phase connection adjacent connection phase-to-phase connection branch V protection action based on generator rated current Current standard value; S differential protection ratio braking characteristic slope; generator neutral point side branch number 6=2 points, generator No. 31 Internal fault at rated load Main protection 4 Sensitivity of various protection schemes Comparison of unit cross-section protection, ie zero-sequence current type cross-section protection, is performed in 5 parallel branches per phase, so the zero-sequence current type cross-section protection is The two adjacent branches of the hall type are composed of the remaining three adjacent branches; the two interphase branches are composed of the remaining three interphase branches.

The total number of faults is 15401540. The cross-section of the unit is divided into two. The incomplete longitudinal branch and the remaining four branches are not applicable because the number of inoperable actions is too large and the sensitivity is very poor. The protection of the unit parts consisting of two branches and the remaining three branches is not limited to the use of adjacent or phase 1 connections. Although the sensitivity is significantly improved, it is still less sensitive than the two protection schemes.

The two sets of protection schemes are divided into 212 groups of, for example, 12!45, 3 or 13, 2 buckets 5 or others. The two sets of zero-sequence current-type cross-section protection are installed between the two groups, and two sets are installed. Each set of separate outlets trips.

Regardless of whether the adjacent connection or the inter-phase connection is adopted, the sensitivity of the two protection schemes is higher than that of the sleeve protection scheme, and the adjacent or inter-phase connection manner is basically sensitive, and the actual method is determined depending on the stator winding neutrality of the generator. The suspicion of the point-side lead connection; the split-phase cross-section protection. In view of the fact that the gorge generator has 5 parallel branches per phase, the way of forming the split-phase cross-section protection may be divided into 1 branch and 4 branches per phase. No advantage. + should be used.

The method of dividing each phase into 2 branches and 3 branches is relatively sensitive. It is recommended to use, and each phase is divided into 2 branches and 2 branches and 1 branch to abandon the space magnetic field and each non-faulty branch. The mutual inductance electromotive force is very different, so it is impossible to move the number of access points of the incomplete partial differential protection of one generator to another generator. Here is the definition of the gorge station, = 1. The beach power station V = 2 but the value should still be satisfied for the gorge power station, 7 = 5, =1 or 2 is ok, = 3 or 4 is not possible, because the latter The short circuit between turns affects the sensitivity of incomplete longitudinal protection.

It is well known that the traditional full differential protection is more sensitive to phase-to-phase short-circuit than other protection schemes, but it does not respond to inter-turn shorts and branch open-circuit faults at all. The beach power station is equipped with full differential protection. The current transformer of the neutral point of the generator has to be added in order to obtain the phase current of each phase of the neutral point. The phase difference or crack phase cross-section protection has been installed and not Under the condition of full differential protection, it is necessary to install the internal longitudinal short-circuit main protection configuration of the 5 xia power station generator that is necessary for full longitudinal protection and foot protection. In view of the incomplete longitudinal differential protection of the generator and the generator set, it is possible to use the generator. The neutral point side meter introduces two branches, for example, the branch 2 is connected to the generator. Branch 4, 5 hair change group vertical and flashing This is intended to use 2 points per phase, for example, 2 branches, 42 points, for example, 45 branches, sisters, phase difference protection, 3 branches + introduction, calculated, whether adjacent Or the way the phase is connected, the sensitivity is significantly reduced, so this method cannot be used.

The cross-section protection should adopt two sets of unit-piece cross-section protection schemes of 212. It is not suitable to adopt the set-unit cross-section protection scheme, and it is not suitable to adopt the split-phase cross-section protection scheme, because the latter is more than the unitary element. The differential generator does not completely change the length of the page. These short suffocating, twisting 6 blood, blood, blood, buckle. People 1 hold a note 1.

The relay source is used for software maintenance and software upgrades. The board can automatically monitor and locate the chip. The fault location capability of the system is greatly improved, and the maintenance personnel are convenient.

6 Conclusion 2 milk 10300 remote terminal unit uses advanced hardware and software flat juice to combine the development level of the weighing machine with the system of the system, and according to the development trend and characteristics of the substation automation, the user has advanced technology. , high reliability substation remote terminal system, Cheng Ming, Jin Ming, Li Jianying, Liu Yuanlong. Unattended substation monitoring technology. Beijing China Electric Power Press, 19991.

The department is lenient, the principle of the bus and the application system design. Beijing Aerospace University Press, 1996, research and application of computer in power system, development work Yuan Rongxiang (3) brother, Dr. Yu is mainly engaged in power system automatic relay protection and attached to the 28th Bayer protection of the current transformer Many, it has been noted that the sensitivity of the crack phase cross-section protection is high and the element is horizontal and protected.

However, the combination of two sets of unit cross-section protection and the same length difference protection = 1 to 2, may make up for this shortcoming, discussed separately, not to mention the incomplete longitudinal differential protection of the generator set as the internal fault of the generator. The differential protection only uses the incomplete longitudinal difference of =2, which is in harmony with the 212纟1. According to the above discussion, it is proposed that the overall configuration scheme of the internal fault protection of the generator transformer simultaneously shows the number and installation position of the current transformers related to these protections. This main protection overall configuration scheme ensures that there are always two or more main protection devices sensitive to the short circuit of the generator transformer and its connection, and the development of the variable-group high-voltage circuit breaker is rapidly jumped.

Qiu Weizhen, Xu Zhenyu. Wang Yiwei. Again, the design of the generator's incomplete longitudinal protection. Power automation equipment. 1999517 Tu Liming. Research on the internal fault analysis method of synchronous generator stator winding and its application. Ph.D. Thesis of Southeast University. 1999.12.

Received 200,005 group of protected teaching and 1 research work; Guilin 174. Male. Doctoral student. Research on the failure and protection of the burning part of the motor Wang Detailed.

male. professor. Engaged in the teaching and research of electrical engineering; Zhang Xueshen 4 male, Dunshi, senior engineer! Engaged in research and design work in the protection of main equipment.

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