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燃气发电机组的优点及逆功率保护介绍

来源:https://www.huannengpower.cn/ 文章作者:济柴环能 发布时间:2022-12-19
一、发电质量好
1、 Good power generation quality
由于发电机工作时只有旋转运动,电调反应速度快,工作特别平稳,发电机输出电压和频率的精度高,波动小,在突加空减50%和75%负载时,机组集腋成裘驼行非常稳定。优于柴油发电机组的电气性能指标。
As the generator only rotates during operation, the response speed of electric regulation is fast, and the operation is particularly stable. The accuracy of generator output voltage and frequency is high, and the fluctuation is small. When 50% and 75% load of air reduction is suddenly applied, the unit is very stable. It is superior to the electrical performance index of diesel generator set.
二、启动性能好,启动成功率高
2、 Good startup performance and high startup success rate
从冷态启动成功后到满负载的时间仅为30秒钟,而规定柴油发电机启动成功后3分钟带负载。燃气轮发电机组可以任何环境温度和气候下保证启动的成功率。
The time from successful cold start to full load is only 30 seconds, while the diesel generator is loaded 3 minutes after successful start according to international regulations. The gas turbine generator unit can guarantee the success rate of startup under any ambient temperature and climate.
三、噪声低振动小
3、 Low noise and low vibration
由于燃汽轮机处于高速旋转状态,它的振动非常小,而且低频噪声优于柴油发电机组。
As the gas turbine rotates at a high speed, its vibration is very small, and the low-frequency noise is better than that of the diesel generator set.

四、采用的可燃性气体是清洁、廉价的能源
4、 The combustible gas used is clean and cheap energy
诸如:瓦斯气,秸秆气,沼气等,以它们为燃料的发电机组不仅运行可靠,成本低,而且能变废为宝,不会产生污染。
For example, gas, straw gas, biogas, etc., the generator set using them as fuel is not only reliable in operation and low in cost, but also can turn waste into treasure without pollution.
发电机逆功率保护,用于保护汽轮机。当主汽门误关闭或机炉保护动作关闭主汽门而发电机出口开关未跳闸时,发电机变成电动机运行状态,此时发电机从系统吸收有功和无功,这种工况对发电机并无影响但由于鼓风损失,气轮机尾部叶片有可能过热,损坏尾部叶片而造成汽轮机事故。因此大机组不允许在这种工况下长时间运行,只允许运行几分钟。
Generator reverse power protection is used to protect steam turbine. When the main throttle valve is closed by mistake or the turbine and boiler protection action closes the main throttle valve but the generator outlet switch does not trip, the generator becomes the motor operation state. At this time, the generator absorbs active and reactive power from the system. This condition has no effect on the generator. However, due to the loss of air blowing, the tail blades of the turbine may overheat and damage the tail blades, causing turbine accidents. Therefore, large units are not allowed to operate for a long time under this working condition, only for a few minutes.
我国自行设计的发电机,以往不装设逆功率保护,但采取以下措施:
In the past, generators designed by ourselves were not equipped with reverse power protection, but the following measures were taken:
(1)采用联锁方法。当主汽门关闭后,用主汽门辅助接点,经延时切除发电机。上述方法虽然可行,但有不足之处,因为都不能正确地反映主汽门关闭情况。为了及时发现逆功率的异常工况,欧洲一些国家在发电机上配置有逆功率保护。逆功率保护其核心元件是逆功率继电器。逆功率继电器和功率方向继电器相似,只是在功率方向相反时动作,及时发出信号或延时动作切机。
(1) Adopt interlocking method. When the main throttle valve is closed, use the auxiliary contact of the main throttle valve to cut off the generator after a delay. Although the above methods are feasible, they have shortcomings, because they can not correctly reflect the closure of the main throttle valve. In order to find out the abnormal working condition of reverse power in time, some European countries are equipped with reverse power protection on the generator. The core component of reverse power protection is reverse power relay. The reverse power relay is similar to the power direction relay. It only acts when the power direction is opposite and sends a signal in time or delays the action to cut off the machine.
(2)主汽门关闭后,在控制室内发信号,如主汽门误关闭,检查之后可迅速恢复供汽,使机组正常运行,如几分钟恢复不了,可由值班员断开发电机出口开关。
(2) After the main throttle valve is closed, send a signal in the control room. If the main throttle valve is closed by mistake, the steam supply can be recovered quickly after inspection to make the unit operate normally. If it cannot be recovered in a few minutes, the operator on duty can disconnect the generator outlet switch.
以上就是为大家介绍的有关天然气发电机组的详细的介绍,希望对您有所帮助.如果您有什么疑问的话,欢迎联系我们.我们将以的态度,为您提供服务https://www.huannengpower.cn
The above is a detailed introduction to the natural gas generator set, and we hope it will be helpful to you. If you have any questions, please contact us. We will provide services for you with our attitude https://www.huannengpower.cn

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