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发电机应装哪些维护?它们的作用是什麼?

来源:http://www.huannengpower.com   发布于:2019-03-01

发电机应装哪些维护?它们的作用是什麼?

What maintenance should the generator be equipped with? What are their functions?

发电机维护和其他的成套负荷维护有些不同.由于发电机的励磁电流和励磁电压和普通成套开关柜的电流电压也有很大的区别.因而我们在维护装设方面也有十分大的差距.爲了保证整个发电机组乃至整个电厂的平安牢靠运转.我们就来详细的谈一下 关于发电机能够发作的毛病和不正常任务形态,应依据发电机的容量有选择地装设以下维护。

Generator maintenance is somewhat different from other complete load maintenance. Because the excitation current and voltage of the generator are quite different from the current and voltage of the general switchgear, there is also a big gap in the maintenance and installation. In order to ensure the safe and reliable operation of the whole generator set and even the whole power plant, we will discuss in detail about the generator can be generated. The following maintenance shall be installed selectively according to the capacity of the generator for faults and abnormal task patterns.

1.纵联差动维护:爲定子绕组及其引出线的相间短路维护。

1. Longitudinal Differential Maintenance: Maintenance of short circuit between stator windings and their lead-out wires.

2.横联差动维护:爲定子绕组一相匝间短路维护。只要当一相定子绕组有两个及以上并联分支而构成两个或三个中性点引出端时,才装设该种维护。

2. Transverse differential maintenance: maintenance for one-phase inter-turn short circuit of stator winding. This kind of maintenance is installed only when one phase stator winding has two or more parallel branches and constitutes two or three neutral point lead-out terminals.

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3.单相接地维护:爲发电机定子绕组的单相接地维护。

3. Single-phase grounding maintenance: single-phase grounding maintenance for generator stator windings.

4.励磁回路接地维护:爲励磁回路的接地毛病维护。

4. Grounding maintenance of excitation circuit: Maintenance for grounding fault of excitation circuit.

5.低励.失磁维护:爲避免大型发电机低励(励磁电流低于静稳极限所对应的励磁电流)或得到励磁(励磁电流爲零)后,从零碎中吸收少量无功功率而对零碎发生不利影响,100MW及以上容量的发电机都装设这种维护。

5. Low excitation. Loss of excitation maintenance: In order to avoid large generators with low excitation (excitation current is lower than the static stability limit corresponding to the excitation current) or get excitation (excitation current is zero), a small amount of reactive power is absorbed from the fragments, which adversely affects the fragmentation. Generators with 100 MW or more capacity are equipped with this maintenance.

6.过负荷维护:发电机长工夫超越额外负荷运转时作用于信号的维护。中小型发电机只装设定子过负荷维护;大型发电机应辨别装设定子过负荷和励磁绕组过负荷维护。

6. Overload Maintenance: Maintenance of the signal when the generator works long hours beyond the extra load. Small and medium-sized generators are only equipped with setter overload maintenance; large generators should distinguish between setter overload maintenance and excitation winding overload maintenance.

7.定子绕组过电流维护:当发电机纵差维护范围外发作短路,而短路元件的维护或断路器回绝举措,这种维护作爲内部短路的后备,也兼作纵差维护的后备维护。

7. Stator winding over-current maintenance: When short-circuit occurs outside the maintenance range of generator longitudinal difference, and the maintenance of short-circuit components or circuit breaker rejection measures, this maintenance is used as backup of internal short-circuit, but also as backup maintenance of longitudinal difference maintenance.

8.定子绕组过电压维护:用于避免忽然甩去全部负荷后惹起定子绕组过电压,水轮发电机和大型汽轮发电机都装设过电压维护,中小型汽轮发电机通常不装设过电压维护。

8. Stator winding overvoltage maintenance: To avoid stator winding overvoltage caused by sudden drop of all loads. Hydro-generators and large turbo-generators are equipped with overvoltage maintenance. Small and medium-sized turbo-generators are usually not equipped with overvoltage maintenance.

9.负序电流维护:电力零碎发作不对称短路或许三相负荷不对称(如电气机车.电弧炉等单相负荷的比重太大)时,会使转子端部.护环内外表等电流密度很大的部位过热,形成转子的部分灼伤,因而应装设负序电流维护。

9. Negative Sequence Current Maintenance: When the power is fragmented and asymmetrical short circuit or three-phase load is asymmetrical (such as electric locomotive and electric arc furnace, the proportion of single-phase load is too large), it will overheat the parts with high current density, such as the inner and outer surface of the retaining ring, and form partial burns of the rotor, so negative sequence current maintenance should be installed.

10.失步维护:反响大型发电机与零碎振荡进程的失步维护。

10. Out-of-step maintenance: Out-of-step maintenance that responds to large generators and piecemeal oscillation processes.

11.逆功率维护:当汽轮机主汽门误封闭,或机炉维护举措封闭主汽门而发电机出口断路器未跳闸时,从电力零碎吸收有功功率而形成汽轮机事故,故大型机组要装设用逆功率继电器构成的逆功率维护,用于维护汽轮机。

11. Reverse power maintenance: When the main valve of a steam turbine is wrongly closed or the main valve of a steam turbine is closed by furnace maintenance measures and the generator outlet circuit breaker is not tripped, the active power is absorbed from the power piecemeal to form a steam turbine accident. Therefore, large units should install reverse power maintenance consisting of reverse power relays to maintain the steam turbine.

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