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當(dāng)頻率變化低于
設(shè)置閾值f12。
它首先用于由發(fā)電機(jī)和熱電聯(lián)產(chǎn)提供的裝置
植物。
大頻率保護(hù)（功能）
該保護(hù)通過(guò)發(fā)出警報(bào)或接通斷路器進(jìn)行干預(yù)
當(dāng)頻率超過(guò)設(shè)定值時(shí)，在調(diào)整延時(shí)（t10）后打開(kāi)
閾值f13。
它首先用于由發(fā)電機(jī)和熱電聯(lián)產(chǎn)提供的裝置
植物。
過(guò)熱保護(hù)（功能OT）
這種保護(hù)允許發(fā)出異常溫度存在的信號(hào)
這可能會(huì)導(dǎo)致行程的電子部件出現(xiàn)故障
單元
如果溫度達(dá)到一個(gè)閾值（70°C），跳閘裝置應(yīng)建議
操作員通過(guò)點(diǎn)亮“警告”led；如果溫度達(dá)到二個(gè)閾值（85°C），除了
“警告”和“警報(bào)”LED，斷路器將跳閘（通過(guò)啟用
正確的參數(shù)）。
符合IEC60255-3的曲線過(guò)載保護(hù)
這種過(guò)載保護(hù)功能在協(xié)調(diào)中得到了應(yīng)用
配有中壓脫扣器和保險(xiǎn)絲。
事實(shí)上，可以獲得以下跳閘曲線之間的協(xié)調(diào)：
通過(guò)接近斷路器跳閘曲線的斜率
中壓脫扣器或保險(xiǎn)絲，使低壓和中壓之間的時(shí)間-電流選擇性為
獲得。除了由電流閾值I1和跳閘時(shí)間定義外
t1，符合標(biāo)準(zhǔn)IEC 60255的曲線由參數(shù)“K”定義
“a”決定了它們的斜率。
參數(shù)如下：
曲線類(lèi)型學(xué)
參數(shù)A B C
K 0.14 13.5 80.0
a 0.02 1.0 2.0
符合標(biāo)準(zhǔn)IEC 60255-3的曲線L可用于電子設(shè)備
用于T7和X1系列斷路器以及
Emax系列斷路器的PR122-PR123型電子跳閘裝置。
open after the adjusted time-delay (t9) when the frequency varies below the set threshold f12. It is used above all for installations supplied by generators and co-generation plants. Protection against maximum frequency (function OF) This protection intervenes by generating an alarm or making the circuit-breaker open after the adjusted time-delay (t10) when the frequency exceeds the set threshold f13. It is used above all for installations supplied by generators and co-generation plants. Protection against overtemperature (function OT) This protection allows signaling of the presence of anomalous temperatures which might cause malfunctioning of the electronic components of the trip unit. If the temperature reaches the first threshold, (70°C), the trip unit shall advise the operator through the lightening up of the “warning” led; should the temperature reach the second threshold (85°C), besides the lightening up of the “warning” and “alarm” leds, the circuit-breaker would be tripped (by enabling the proper parameter). Overload protection with curves according to IEC60255-3 This protection function against overload finds its application in the co-ordination with MV releases and fuses. In fact it is possible to obtain a co-ordination among the tripping curves of the circuit-breakers by getting nearer to the slopes of the tripping curves of MV releases or fuses, so that time-current selectivity between LV and MV is obtained. Besides being defined by a current threshold I1 and by a trip time t1, the curves according to Std. IEC 60255 are defined by the parameters “K” and “a” which determine their slope. The parameters are the following: Curve typology Parameters A B C K 0.14 13.5 80.0 a 0.02 1.0 2.0 The curve L complying with Std. IEC 60255-3 is available both for the electronic trip units type PR332-PR333 for T7 and X1 series circuit-breakers, as well as for the electronic trip units type PR122-PR123 for Emax series circuit-breakers.
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