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HONEYWELL 05701-A-0550加密狗鑰匙
斷路器故障時的定時：（1） 已發(fā)生故障并已由保護裝置檢測到。（2） 在機組保護運行時間后，跳閘命令傳輸至斷路器，同時啟動BFP。跳閘命令可以是單個（啟動Lx）或三相（從L1L2L3開始）。冗余信號還包括：同時激活。（3） 斷路器斷開故障電流。（4） 在復位延遲tReset加上安全裕度tMargin之后
BFP檢測到故障電流已中斷，保護功能復位，或者故障電流繼續(xù)流動，并由
BFP使斷路器跳閘。（5） 第二次嘗試跳閘斷路器成功并且故障電流被中斷。在進一步的復位延遲tReset加上安全裕度tMargin之后，BFP檢測到故障電流已中斷，保護功能復位，或者故障電流繼續(xù)流動，BFP啟動備用跳閘。如果僅要求BFP執(zhí)行單個斷路器故障步驟，可以禁用定時器t1（參見“t1激活”）。答復BFP再次對應于圖3.5.33.1，但帶有計時器1設置為零。
無條件跳閘情況下的時間安排：
（1） 已發(fā)生故障并已由保護裝置檢測到。（2） 輸入“Ext Start”處的信號啟動UT功能。
（3） 斷路器斷開故障電流。（4） 如果在復位延遲tReset加上安全裕度tMargin之后
斷路器輔助觸點“斷路器接通”仍向UT發(fā)出信號CB關閉時，UT功能進行第二次嘗試使斷路器跳閘。
（5） 第二次嘗試跳閘斷路器成功并且故障電流被中斷。
（6） 如果在進一步復位延遲tReset加上安全裕度tMargin之后
斷路器輔助觸點“斷路器接通”仍向UT發(fā)出信號：斷路器閉合，備用跳閘由UT啟動
作用端區(qū)故障的時序圖（1） 應用于斷路器的跳閘命令。（2） 斷路器輔助觸點發(fā)出斷路器斷開的信號
用于啟動的功能的“CB Off”輸入EFP。
（3） 斷路器斷開故障電流。（4） 在復位延遲加上安全裕度后，電流單元或檢測到故障電流已中斷，或
EFP功能復位，或故障電流繼續(xù)并發(fā)出EFP信號。
斷路器打開斷路器關閉復位tEFP t tt+t邊緣tCB斷開CB斷開時間，包括滅弧時間
斷路器輔助觸點的tCB斷開斷路器斷開時間（信號“斷路器打開”）t設置電流檢測器的復位時間3）t正常故障清除時間變化的余量4）
Timing in the case of breaker failure:
(1) A fault has occurred and been detected by a protective device.
(2) A tripping command is transmitted to the circuit-breaker after the unit protection operating time which also starts the
BFP. The tripping command can be either single (Start Lx) or
three-phase (Start L1L2L3). The redundant signals are also
activated at the same time.
(3) The circuit-breaker ruptures the fault current.
(4) After the reset delay tReset plus a safety margin tMargin , the
BFP either detects that the fault current has been interrupted and the protection function resets, or the fault current continues to flow and a second attempt is made by the
BFP to trip the circuit-breaker.
(5) The second attempt to trip the circuit-breaker is successful
and the fault current is interrupted.After a further reset delay tReset plus a safety margin tMargin ,
the BFP either detects that the fault current has been interrupted and the protection function resets, or the fault current continues to flow and the BFP initiates backup tripping.
If the BFP is only required to carry out a single breaker failure
step, timer t1 can be disabled (see ‘t1 active’). The response of
the BFP corresponds once again to Fig. 3.5.33.1, but with timer
t1 set to zero.
Timing in the case of an unconditional trip:
(1) A fault has occurred and been detected by a protective device.
(2) A signal at input ‘Ext Start’ starts the UT function.
(3) The circuit-breaker ruptures the fault current.
(4) If after the reset delay tReset plus a safety margin tMargin , the
CB auxiliary contact “CB On” still signals to the UT that the
CB is closed, a second attempt is made by the UT function
to trip the circuit-breaker.
(5) The second attempt to trip the circuit-breaker is successful
and the fault current is interrupted.
(6) If after a further reset delay tReset plus a safety margin tMargin
the CB auxiliary contact “CB On” still signals to the UT that
the CB is closed, backup tripping is initiated by the UT
function.Timing diagram for an end zone fault
(1) Tripping command applied to the CB.
(2) CB auxiliary contact sends a signal that the CB is open to
the “CB Off” input of the function which is used to start the
EFP.
(3) The circuit-breaker ruptures the fault current.
(4) After a reset delay plus a safety margin, the current unit either detects that the fault current has been interrupted and
the EFP function resets, or the fault current continues to
flow and an EFP signal is issued.
CB open CB Off Reset tEFP t t t + tMargin
tCB open CB opening time including arc extinction time
tCB Off CB opening time of the CB auxiliary contact
(Signal ?CB open“)
tReset Reset time of the current detector 3)
tMargin Allowance for variations in normal fault clearing time 4)
