| 在电压互感器一次侧加装消谐器会给设备运行增加一层防护 |
| 添加时间：2017/5/17 17:32:07 浏览次数： |
| 我们一般指PT柜加装消谐器，是指安装在6-35kV电磁式电压互感器(简称压变)一次绕阻Yo结线中性点与地之间的非线性电阻器，起阻尼与限流的作用。在6-35kV发电、变电站，我们经常碰到的是电网中性点不接地，其母线上的Yo接线的电磁式压变一次绕组，成为中性点不接地电网对地的唯一金属通道，电网相对地电容的充、放电途径 必然通过压变一次绕组。这种慢变过程使压变铁芯深度饱和，当电网接地消失时，压变一次绕组中会出现数安培幅值的涌流，将压变0.5A高压熔丝熔断。即使这种涌流尚未达到熔断器的熔断值，但仍超过电压互感器额定电流，长时间处于过电流状态下运行的电压互感器会被烧毁，继而引发其他事故。选用一次消谐器，这种现象就不会发生。当单相接地电容电流小于一定的值时，不会在压变一次绕组中出线较大的涌流，对压变和高压熔丝无任何影响，从经济和产品成本的角度考虑，可以不装消谐器。如果顾客提出要求，在电压互感器一次侧加装消谐器会给设备运行增加一层防护。 We generally refers to PT ark with harmonic elimination device, is refers to the installation in 6 to 35 kv electromagnetic voltage transformer (hereinafter referred to as pressure change) a winding yukio okamoto, connection between neutral and ground nonlinear resistor, damping and current limiting effect. In 6-35 kv power generation, substation, we often encounter the neutral point grounding grid is, its parent online yukio okamoto, wiring of electromagnetic pressure becomes a winding, become a neutral point grounding grid, the only metal channel to the ground, the grid relatively capacitor charge and discharge way Must become a winding through pressing. The slowly varying process make depth of iron core saturation pressure, when the grounding grid disappears, pressure changes will appear in A winding several amperes amplitude of flow, the pressure change 0.5 A high-voltage fuse fusing. Even if the flow has yet to reach fuse fusing value, but still more than rated current, voltage transformer run over current conditions for a long time of voltage transformer will be destroyed, which in turn cause other accidents. With a dissonance, this doesn't happen. When single phase grounding capacitive current is less than a certain value, not the pressure change in the primary winding wire larger flow, the pressure change and high-voltage fuse without any impact, considering from the Angle of economy and the product cost, can not install harmonic elimination. If the customer requests, a new anti-harmoniser on the voltage transformer will add a layer of protection to the equipment operation. |
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