焦化发电机组品牌

　　变电站毛病录波器接入的模拟量信号首要包含变电站各级母线电压信号以及各回进出线的电流信号，能够依据母线电压和线路电流信号的改变状况来进行体系毛病检测。但由于变电站一般进出线较多，且当线路进行检修时，检修线路的电流信号消失，因此，为削减毛病检测判别的核算量，适应体系运转方法的改变，变电站毛病录波器所选用的毛病检测方法一般以电压信号检测方法为主。关于重要线路，如与变电站主电源相连的线路，才用电流信号作为毛病检测依据。现在，变电站毛病录波设备常用的基本毛病检测方法首要包含：

　　The analog signals connected by the substation fault recorder mainly include the bus voltage signals at all levels in the substation and the current signals of the incoming and outgoing lines, which can be used to detect the system fault according to the change of the bus voltage and the line current signal. However, as the substation generally has more and more lines, and when the line is overhauled, the current signal of the maintenance line is disappearing. So, in order to reduce the accounting amount of the fault detection and to adapt to the change of the system operation method, the fault detection method selected by the substation fault recorder is mainly based on the voltage signal detection method. For important lines, such as those connected to the main power supply of substations, the current signal is used as the basis for detecting defects. Nowadays, the basic defect detection methods commonly used in substation fault recording devices include:

　　（1)相电压和零序电压突变量检测。反映电网毛病与严重操作，对超高压电网中任一结点来说，反映电网严重暂态改变的底子标志是母线电压的俄然改变，以相电压突变量为发动判据，能够监测接入变电所高压母线上的任一元件发作毛病或有严重操作而引起的电网暂态状况。合适的电压突变量应挑选为三个相电压与一个零序电压突变量正与负的改变。为了反映电网暂态的发作及变换，例如线路发作毛病（电压俄然下降）、毛病线路跳闸（电压俄然增高），有必要同时选取突增量与突减量发动，确保在每一次新的电网暂态开端，这个发动判据都能牢靠地发动一次。以零序电压突变量为发动判据，能够在电网发作毛病以及进行重合闸时进一步支撑毛病动态记载设备的牢靠发动。挑选电压突变量作发动判据，简略、牢靠，简单满意灵敏度要求。

　　(1) detection of phase voltage and zero sequence voltage abrupt variable. Reflecting the fault and serious operation of the power grid, for any node in the ultra high voltage power grid, the base sign that reflects the serious transient change of the power grid is the Russian change of the bus voltage, and the phase voltage abrupt variable is used as the starting criterion to monitor any element on the high voltage bus of the substation or the electricity caused by serious operation. The transient state of the network. Appropriate voltage sudden variables should be selected as three phase voltages and a zero sequence voltage sudden change with positive and negative changes. In order to reflect the seizure and transformation of power grid transient, such as line attack (voltage and Russian decline), fault line tripping (the voltage Russian increase), it is necessary to select the sudden increment and sudden reduction to ensure that this launching criterion can be carried out firmly at the beginning of each new power grid. With zero sequence voltage sudden change as the starting criterion, it can further support faults when the power grid breaks down and reclosure, and dynamically record the reliable start of the equipment. Select the voltage sudden variable as the starting criterion, simple, reliable, simple and satisfied with the sensitivity requirements.

　　(2)电压越限检测。正常运转电压的高低，直接影响电力设备安全与电网安稳运转。电压越限检测包含正序电压越限检测以及负序和零序电压的越限检测。正序电压检测首要用于监视、判别电力体系运转的实践电压是否越限。负序电压和零序电压检测首要用于检测电力体系三相不平衡而引起的不正常运转状况。

　　(2) voltage limit detection. The normal operation voltage directly affects the safety of power equipment and the stable operation of power grid. The detection of voltage limit includes detection of positive sequence voltage limit and detection of negative sequence and zero sequence voltage. Positive sequence voltage detection is primarily used to monitor and distinguish the practical voltage limit of power system operation. Negative sequence voltage and zero sequence voltage detection are mainly used to detect abnormal operation caused by unbalanced three-phase power system.

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