产品内容介绍
ASP120000电源模块
NS2PTOC还可以用作备份保护也就是说，在线路保护或断路器无法清除不平衡系统故障的情况下保护发电机。为了在外部不平衡条件下为发电机提供有效保护，NS2PTOC能够直接测量负序电流。NS2PTOC还有一个延时特性，它与标准IEEE C50.13中定义的发电机2 2 I t K=的加热特性相匹配。其中：I2是以每单位额定发电机电流表示的负序电流t是以秒为单位的运行时间K是一个常数，取决于发电机的尺寸和设计NS2PTOC具有广泛的K设置范围和灵敏度负序电流检测和跳闸能力，直至发电机的连续能力。单独的输出可用作警报功能，警告操作员潜在的危险情况。同步发电机AEGGAPC的意外通电保护由于操作错误、断路器头闪络、控制电路故障或这些原因的组合，离线发电机的意外或意外通电经常发生。意外通电的发电机作为感应电机运行，从系统中吸取大量电流。电压监控过电流保护用于保护意外通电的发电机。同步发电机意外通电保护（AEGGAPC）采用发电机端子侧或发电机中性点侧的最大相电流输入和端子侧的最大相间电压输入。当终端电压在预设时间内降至指定电压水平以下时，AEGGAPC启用。
电压保护
两步欠压保护UV2PTUV在故障或异常情况下，电力系统可能会出现欠压。两步欠压保护（UV2PTUV）功能可用于断开断路器，为断电时的系统恢复做好准备，或作为主保护的长期延迟备份。UV2PTUV有两个电压阶跃，每个电压阶跃具有反向或定时限延时。两步过电压保护OV2PTOV在异常情况下，如突然断电、分接开关调节故障、长线路线路端部开路等，电力系统中可能会发生过电压。两步过压保护（OV2PTO）功能可用于检测线路端部的开路，通常与定向无功过功率功能相结合，以监控系统电压。当触发时，该功能将引发警报、接通电抗器或断开电容器组。OV2PTOV有两个电压阶跃，每个电压阶跃都具有反时限或定时延时。OV2PTOV具有极高的复位比，允许设置接近系统工作电压。两步剩余过电压保护ROV2PTOV接地故障期间，电力系统中可能会出现剩余电压。两步剩余过电压保护ROV2PTOV功能计算来自三相电压输入变压器的剩余电压，或测量来自开口三角形或中性点电压变压器馈电的单电压输入变压器。ROV2PTOV有两个电压阶跃，每个电压阶跃具有反时限或定时限延时。复位延迟可确保间歇性接地故障的运行。
NS2PTOC can also be used as a backup protection
that is, to protect the generator in case line protections or circuit breakers fail to clear unbalanced system faults. To provide an effective protection for the generator for external unbalanced conditions, NS2PTOC is able to directly measure the negative sequence current. NS2PTOC also has a time delay characteristic which matches the heating characteristic of the generator 2 2 I t K= as defined in standard IEEE C50.13. where: I2 is negative sequence current expressed in per unit of the rated generator current t is operating time in seconds K is a constant which depends of the generators size and design NS2PTOC has a wide range of K settings and the sensitivity and capability of detecting and tripping for negative sequence currents down to the continuous capability of a generator. A separate output is available as an alarm feature to warn the operator of a potentially dangerous situation. Accidental energizing protection for synchronous generator AEGGAPC Inadvertent or accidental energizing of off-line generators has occurred often enough due to operating errors, breaker head flashovers, control circuit malfunctions, or a combination of these causes. Inadvertently energized generator operates as induction motor drawing a large current from the system. The voltage supervised overcurrent protection is used to protect the inadvertently energized generator. Accidental energizing protection for synchronous generator (AEGGAPC) takes the maximum phase current input from the generator terminal side or from generator neutral side and maximum phase to phase voltage inputs from the terminal side. AEGGAPC is enabled when the terminal voltage drops below the specified voltage level for the preset time.
Voltage protection
Two step undervoltage protection UV2PTUV Undervoltages can occur in the power system during faults or abnormal conditions. Two step undervoltage protection (UV2PTUV) function can be used to open circuit breakers to prepare for system restoration at power outages or as longtime delayed back-up to primary protection. UV2PTUV has two voltage steps, each with inverse or definite time delay. Two step overvoltage protection OV2PTOV Overvoltages may occur in the power system during abnormal conditions such as sudden power loss, tap changer regulating failures, open line ends on long lines etc. Two step overvoltage protection (OV2PTOV) function can be used to detect open line ends, normally then combined with a directional reactive over-power function to supervise the system voltage. When triggered, the function will cause an alarm, switch in reactors, or switch out capacitor banks. OV2PTOV has two voltage steps, each of them with inverse or definite time delayed. OV2PTOV has an extremely high reset ratio to allow settings close to system service voltage. Two step residual overvoltage protection ROV2PTOV Residual voltages may occur in the power system during earth faults. Two step residual overvoltage protection ROV2PTOV function calculates the residual voltage from the three-phase voltage input transformers or measures it from a single voltage input transformer fed from an open delta or neutral point voltage transformer. ROV2PTOV has two voltage steps, each with inverse or definite time delay. Reset delay ensures operation for intermittent earth faults.
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