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供配电系统知识大全(全新课件)

  • 2026-04-04 00:18:36
供配电系统知识大全(全新课件)

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变电所位置的选择,应根据下列要求并经技术经济分析比较后确定:

1.尽量接近负荷中心,以降低配电系统的电能损耗、电压损耗和有色金属消耗量;

2.进出线方便,特别是要便于架空进出线;

3.接近电源侧,特别是工厂的总降压变电所和高压配电所;

4.设备运输方便,特别是要考虑电力变压器和高低压成套配电装置的运输;

5.不应设在有剧烈振动或高温的场所,无法避开时,应有防振和隔热的措施;

6.不宜设在多尘或有腐蚀性气体的场所,无法远离时,不应设在污染源的下风侧;

7.不应设在厕所、浴室和其他经常积水场所的正下方,且不宜与上述场所相贴邻;

8.不应设在有爆炸危险环境的正上方或正下方,且不宜设在有火灾危险环境的正上方或正下方。当与有爆炸或火灾危险环境的建筑物毗连时,应符合现行国家标准GB50058—1992《爆炸和火灾危险环境电力装置设计规范的规定;

9.不应设在地势低洼和可能积水的场所。

1.主变压器台数的选择原则

  工厂变电所的主变压器数应根据下列原则选择:

  (1)满足用电负荷对供电可靠性的要求

对供有大量一、二级负荷的变电所应采用两台变压器,对只有二级负荷的变电所,也可只采用一台变压器,并在低压侧架设与其他变电所的联络线;

  (2)对季节性负荷或昼夜负荷变动较大的变电所,可考虑采用两台主变压器;

  (3)一般的三级负荷只采用一台主变压器;

  (4)考虑负荷的发展,应留有安装第二台主变压器的空间。

2.电力变压器的额定容量

  电力变压器的额定容量,是指它在规定的环境温度条件下,户外安装时,在规定的使用年限(20年)内所能连续输出的最大视在功率(KV.A)。

  电力变压器的使用年限,主要取决于变压器绕组绝缘的老化速度,而绝缘的老化速度又取决于绕组最热点的温度。

  电力变压器的绕组导体和铁心,一般可以长期经受较高的温升而不致损坏。但绕组长期受热时,其绝缘的弹性和机械强度要逐渐减弱,这就是绝缘的老化现象。绝缘老化严重时,就会变脆、裂纹和脱落。试验表明,在规定的环境温度条件下,如果变压器绕组最热点的温度一直维持95°,则变压器可持续安全运行20年。但如果变压器绕组温度升高到120°时,则变压器只能运行2年,如图3 -4所示。

1.电力变压器的正常过负荷能力

  电力变压器在正常运行时,负荷不应超过其额定容量。但是,变压器并非总在最大负荷下运行,在许多时间内变压器的实际负荷远小于额定容量。因此,变压器在不降低规定使用寿命的条件下具有一定的短期过负荷能力。变压器的过负荷能力,分正常过负荷能力和事故过负荷能力两种。

  电力变压器在正常运行时带额定负荷可连续运行20年。由于昼夜负荷变化和季节性负荷差异而允许的变压器过负荷,称为正常过负荷。这种过负荷系数的总数,对室外变压器不超过30%,对室内变压器不超过20%

  电力变压器的正常过负荷时间是指在不影响其寿命、不损坏变压器的各部分绝缘的情况下允许过负荷的持续时间。允许变压器正常过负荷倍数及允许过负荷的持续时间见表3 -1

拉开高压隔离开关时的操作

①开始时应慢而谨慎,当刀片刚要离开固定触头时应迅速。特别是切断变压器的空载电流、架空线路和电缆的充电电流、架空线路小负荷电流以及环路电流时,拉开高压隔离开关时更应迅速、果断,以便能迅速灭弧。

②拉开高压隔离开关后,应检查高压隔离开关每相确实已在断开位置,并应使刀片尽量拉到头。

误拉高压隔离开关时,在刀片刚要离开固定触头时,便发生电弧,这时应立即合上,可以消灭电弧,避免事故。如果高压隔离开关已经全部拉开,则绝不允许将误拉的高压隔离开关再合上。

如果是单极高压隔离开关,操作一相后发现误拉,对其他两相则不允许继续操作。

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  1. CONNECT:[ UseTime:0.000384s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000847s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000339s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000293s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000504s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000640s ]
  8. SELECT * FROM `article` WHERE `id` = 487301 LIMIT 1 [ RunTime:0.001843s ]
  9. UPDATE `article` SET `lasttime` = 1775860675 WHERE `id` = 487301 [ RunTime:0.013087s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001665s ]
  11. SELECT * FROM `article` WHERE `id` < 487301 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000966s ]
  12. SELECT * FROM `article` WHERE `id` > 487301 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002779s ]
  13. SELECT * FROM `article` WHERE `id` < 487301 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004027s ]
  14. SELECT * FROM `article` WHERE `id` < 487301 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003091s ]
  15. SELECT * FROM `article` WHERE `id` < 487301 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005857s ]
0.108227s