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Capacitor protection

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9676 Capacitor protection relay

9676 Capacitor protection relay

The 9676 Capacitor protection device suitable for capacitor of 110KV, 66KV and below voltage, the device has many protective functions of instantaneous trip protection, over current, the unbalanced current (capacitor open-delta) and unbalanced voltage (capacitor open-delta), over voltage (trip operation), low voltage (trip operation), bus ground (alarm) ; and it integrates protection and telecontrol. It can not only focus on group panel, but also can be installed in the switchgear on the spot, comprehensive support for the comprehensive automatic distribution system.
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 The protective function of Capacitor protection device

        Current instantaneous trip protection
        Over current protection
        Unbalanced current (capacitor open-delta)
        Unbalanced voltage (capacitor open-delta)
        Over voltage (trip operation), 
        Low voltage (trip operation), 
        Bus ground (alarm)
 
Measurement and control:
        Busbar voltage : Uab、Ubc、Uca;Ua、Ub、Uc;
        Measuring current : Ia、 Ib、 Ic、
        Power: P Q cosФ
        Frequency: f
 
Assistant functions:
        Control the circuit break
        Opening and closing of circuit breaker by hand
        Opening and closing of circuit breaker by remote control
        Fault recording
 
Communication mode
        485 communication
        Ethernet communication
        Fiber-optic communication
 
Protection Principle:
        Current instantaneous trip protection
        1.RLP1 current instantaneous trip protection-“turn on”
        2.Any phase current sampling value of protective current IA (IB) IC≧current instantaneous trip protection constant value (Idz0).
        Protector action exit C7/C8, while driving the fault signaling relay C1/C3 (return after 10s).  Panel emergency lamp lights.
 
Over current protection
        1.RLP2 over current protection--“turn on”
        2.Any phase current sampling value of protective current IA (IB) IC≧over current protection constant value(Idz2)
        3.Collected current time from start to end ≧ over current delay
        Protector action exit C7/C8, while driving the fault signaling relay C1/C3 (return after 10s).  Panel emergency lamp lights.
 
Low voltage
        1.RLP3 low voltage--“turn on”; switch is closed
        2.Any of the two phase line voltage sampling value≦low voltage constant value(Udz1)
        3.Low voltage sampling delay time≧ low voltage delay(tuzd1)
        4.Protector action exit C7/C8, while driving the fault signaling relay C1/C3 (return after 10s).  Panel emergency lamp lights.
 
Over voltage
        1.RLP4  over voltage--“turn on”; switch is closed
        2.Any of the two phase line voltage sampling value≧over voltage constant value(Udzh)
        3.over voltage sampling delay time≧ over voltage delay(tuzd2)
        4.Protector action exit C7/C8, while driving the fault signaling relay C1/C3 (return after 10s).  Panel emergency lamp lights.
 
Unbalanced voltage
        1.RLP5 unbalanced voltage--“turn on”;
        2.unbalanced voltage(3Uo) sampling value≧ unbalanced voltage constant value(Updz)
        3.unbalanced voltage duration time≧ over voltage delay(tupzd)
        Protector action exit C7/C8, while driving the fault signaling relay C1/C3 (return after 10s).  Panel emergency lamp lights.
 
 Unbalanced current
        1.  RLP6 unbalanced current --“turn on”;
        2.  unbalanced current (3Io) sampling value≧ unbalanced current constant value(Ipdz)
        3.  unbalanced current duration time≧ over current delay(tipzd)
        Protector action exit C7/C8, while driving the fault signaling relay C1/C3 (return after 10s).  Panel emergency lamp lights.
 
PT line-break
        1.RLP7 PT line-break--“turn on”;
        2.a. The maximum line voltage is less than 30V, and any phase protective current is greater than 0.3A;
        b. Negative sequence voltage is greater than 8V;
        If meet any of the above conditions and the delay time of device over 10s, it happens PT line break
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209585994

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