產品內容介紹
ASP120000電源模塊
NS2PTOC還可以用作備份保護也就是說，在線路保護或斷路器無法清除不平衡系統故障的情況下保護發電機。為了在外部不平衡條件下為發電機提供有效保護，NS2PTOC能夠直接測量負序電流。NS2PTOC還有一個延時特性，它與標準IEEE C50.13中定義的發電機2 2 I t K=的加熱特性相匹配。其中：I2是以每單位額定發電機電流表示的負序電流t是以秒為單位的運行時間K是一個常數，取決于發電機的尺寸和設計NS2PTOC具有廣泛的K設置范圍和靈敏度負序電流檢測和跳閘能力，直至發電機的連續能力。單獨的輸出可用作警報功能，警告操作員潛在的危險情況。同步發電機AEGGAPC的意外通電保護由于操作錯誤、斷路器頭閃絡、控制電路故障或這些原因的組合，離線發電機的意外或意外通電經常發生。意外通電的發電機作為感應電機運行，從系統中吸取大量電流。電壓監控過電流保護用于保護意外通電的發電機。同步發電機意外通電保護（AEGGAPC）采用發電機端子側或發電機中性點側的最大相電流輸入和端子側的最大相間電壓輸入。當終端電壓在預設時間內降至指定電壓水平以下時，AEGGAPC啟用。
電壓保護
兩步欠壓保護UV2PTUV在故障或異常情況下，電力系統可能會出現欠壓。兩步欠壓保護（UV2PTUV）功能可用于斷開斷路器，為斷電時的系統恢復做好準備，或作為主保護的長期延遲備份。UV2PTUV有兩個電壓階躍，每個電壓階躍具有反向或定時限延時。兩步過電壓保護OV2PTOV在異常情況下，如突然斷電、分接開關調節故障、長線路線路端部開路等，電力系統中可能會發生過電壓。兩步過壓保護（OV2PTO）功能可用于檢測線路端部的開路，通常與定向無功過功率功能相結合，以監控系統電壓。當觸發時，該功能將引發警報、接通電抗器或斷開電容器組。OV2PTOV有兩個電壓階躍，每個電壓階躍都具有反時限或定時延時。OV2PTOV具有極高的復位比，允許設置接近系統工作電壓。兩步剩余過電壓保護ROV2PTOV接地故障期間，電力系統中可能會出現剩余電壓。兩步剩余過電壓保護ROV2PTOV功能計算來自三相電壓輸入變壓器的剩余電壓，或測量來自開口三角形或中性點電壓變壓器饋電的單電壓輸入變壓器。ROV2PTOV有兩個電壓階躍，每個電壓階躍具有反時限或定時限延時。復位延遲可確保間歇性接地故障的運行。
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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