山东干式变压器：山东干式变压器的运行维护要点

山东干式变压器的运行维护要点 　　

山东干式变压器和油浸式山东干式变压器相比。其有难燃、自熄、机械强度高、承受短路能力强、运行维护方便等优点。但在通风不畅的情况下，其散热性能没有油浸式山东干式变压器好。因此，山东干式变压器的运行维护就以控制温升为重点。
1)定期做好清扫工作。如果发现有过多的灰尘聚集，则必须清除，以保证空气流通和防止绝缘击穿.在积尘量较大的场所（如锅炉旁)，山东干式变压器室至少每半年清扫一次。对于通风道里的灰尘，应使用压缩空气来进行清除。
2)加强通风设备的运行维护。要确保风机的正常运转.除非所带负载很小，例如小于山东干式变压器容量的1/3，可用一台风机运转。
3)平常要加强对温控器的观察.看显示的三相湿度是否平衡，某一相的湿度显示值是否有突变现象。温控器与山东干式变压器内部热敏电阻(测温度)之间的接头是针式插头。如果它接触不良，就会导致温控器误判断。但如果加强监视，就会发现温控器的不正常工作状态，避免故障的发生.对于大容量山东干式变压器和重要场所的山东干式变压器，在订货时要求山东干式变压器生产厂每相多埋一只热敏电阻，对温控器实现双重化配置，防止此类故障的发生。
4)在潮湿的场所和天气寒冷的情况下，若启用已停运的山东干式变压器，则要检查是否有异常潮湿和凝露现象。如果有，要用机械热风对其表面进行干燥处理，以防绝缘击穿.对山东干式变压器而言.这种表面凝露并不影响到绕组内部的绝缘。因.此，简单处理后，只要绝缘电阻值不小于2MΩ/ 1000V就可投入运行。运行中其损耗产生的热量，会使绝缘电阻恢复正常。在正常运行条件下.由于山东干式变压器的本体温度高于其四周的环境温度.因此不会出现绝缘电阻下降的现象。
5)认真检查紧固件、连接件是否松动。山东干式变压器在长期运行过程中，由于外界短路等原因，不可避免地出现端头受力、振动而引起的紧固件、连接件松动等现象，就有可能产生过热点。因此.在高低压端头及所有可能产生过热的地方.都要设置示温蜡片，定期观察，同时结合清扫、预防性试验，认真检查、紧固端头和连接件。
6)要积极预防铁心锈蚀。由于山东干式变压器的铁心都暴露在空气中，所以很容易锈蚀.对干双主山东干式变压器配电所而言。通常还备用一台山东干式变压器.因此，如果铁心保养不当会发生大面积铁心锈蚀，就降低山东干式变压器的寿命，使山东干式变压器的损耗增加。所以，定期除锈、防锈，也是保证山东干式变压器正常运行的一个重要内容。
7）山东干式变压器室要有良好的通风条件，一般1kW的损耗，应有4m³/min的通风量。对无外壳的山东干式变压器，应在周围安装隔离栅栏。山东干式变压器室的门、通风孔都要有防小动物进出的隔离网等，也应避免雨雪入侵本体。另外.山东干式变压器耐压水平较油浸式山东干式变压器低，因此，更要加强对避雷器的维护和检测，且对35kV的产品.高压侧应由电缆进线.不宜直接与架空线连接。

Dry-type transformers, operation and maintenance points

Dry-type transformers and oil-immersed transformer. Its flame retardant, self-extinguishing, high mechanical strength to withstand the short circuit capacity, easy operation and maintenance. However, in the case of poor ventilation, its thermal performance is not oil-immersed transformer. Therefore, the operation and maintenance of dry-type transformers to control the temperature rise as the focus.
1) do clean-up work on a regular basis. If you find that there is too much dust gathered, you must clear in order to ensure air circulation and to prevent insulation breakdown. Dust larger spaces (such as the boiler side), transformer room cleaning once every six months at least. For the dust of ventilation hang, you should use compressed air to clear.
2) to enhance the operation and maintenance of ventilation equipment. To ensure the normal operation of the fan, unless the load carried by a very small, eg less than 1/3 of the transformer capacity can be used a wind turbine operation.
3) normal to strengthen the observation of the thermostat to see the show three-phase humidity balance, a phase humidity display the value of the mutation. The joints between the thermostat and transformer internal thermal resistance (measured temperature) pin plug. If it is poor contact will cause the thermostat mistakenly judge. Stepped up surveillance, you will find the normal operation of the thermostat, to avoid failure occurred for large-capacity transformer and an important place of the transformer, the transformer production plant each when ordering requirements relative to buried more than a thermistor, thermostat to achieve the double configuration, to prevent the occurrence of such failure.
4) In the case of cold wet weather and places, dry-type transformers to enable outage, will have to check for abnormal moisture and华盈非晶合金变压器有限公司 condensation phenomena. If so, use mechanical hot air on its surface to be dried to prevent insulation breakdown. Dry-type transformers. This surface condensation does not affect the internal insulation of windings. A result of this simple treatment, as long as the insulation resistance value of not less than 2MΩ / 1000V can be put into operation. Run its loss of heat generated will return to normal insulation resistance. Under normal operating conditions. Transformer body temperature is higher than the ambient temperature of their surroundings, so does not appear the phenomenon of decline of insulation resistance.
5) carefully check the fasteners, connectors are loose. Transformer in the long-running process, outside short-circuit and other reasons, inevitably ends by force, vibration caused by fasteners, connecting pieces of loose such phenomena, it is possible to produce hot spots. High and low pressure ends and may overheat. Should be set to show the warm wax, regular observation, combined with cleaning, preventive tests, carefully check, fastening the ends and fittings.
6) To actively prevent the core corrosion. The core of the dry-type transformers are exposed to the air, so it is easy to rust. Dry dual main transformers and distribution in terms of. Usually spare a dry-type transformers, therefore, if the core improper maintenance will occur to a large area of ??core corrosion, reduces the life of the transformer, the transformer losses increase. So, on a regular basis rust, rust-proof, but also an important element to ensure the normal operation of the dry-type transformers.
7) The transformer room have good ventilation, general 1kW loss should be 4m ³ / min ventilation rate. Should be installed in the surrounding shell transformer isolation barrier. Transformer room doors, vents should have anti-small animals in and out of the isolation network should also avoid the rain and snow intrusion body. Dry-type transformers voltage level lower than the oil-immersed transformer, therefore, to strengthen the maintenance and testing of the arrester, and the right products. 35kV high-voltage side by the cable line is not directly connected to the overhead line.

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