9671 line protection relay

 

9671 line protection unit is mainly used in such a voltage of 110KV,66KV,35KV.10KV.6KV,3KV, the device has the complete function of protection, control, and fault recording, also has the 485 communication, Ethernet communication and optical fiber communication is the best choice of the cabinet of 110KV and 66KV, if you need the economical and practical line protection unit of the 35KV to be low voltage, you can choose the 9511 and 9411line protection unit.
protection function
current instantaneous trip protection（instantaneous trip protection, the direction of instantaneous trip protection）.
current instantaneous trip protection（instantaneous  trip protection, the direction of instantaneous trip protection）.
 over-current protection  （Over current, the direction of over current, Inverse time over-current protection）
automatic reclosing   （reclosing,  without pressure, reclosing   )
Overload Protection (overload alarm, overload trip)
Zero-Sequence Over-Current Protection (zero sequences overcurrent, zero-sequence voltage lockout, the direction of zero sequences, zero sequence trip).
Low-frequency load shedding (low-frequency load shedding, low voltage lockout, Sliding lockout)
low voltage Protection 
Busbar earthing
PT line-break
 
 
Measurement and control function
 busbar voltage  ：Uab、Ubc、Uca；Ua、Ub、Uc；
Measuring current：Ia、 Ib、 Ic、
 power ：P、Q、cosФ；
 frequency ：f；
 
Auxiliary function
Conditions of the no-check closing 
control circuit line-break
 manual close and trip
Remote control close and trip
Fault recording
 
 communication mode 
485 communication
Ethernet communication
Optical fiber communication
  Protective action principle
Current instantaneous trip protection
1．RLP1  instantaneous trip－“input
2．The protection of current IA (IB) IC.any phase current sampling value is more than that value（Idz0）
Protection immediately export of C7/C8, while driving the accident signal relay C1/C3 (return after 10s).
2．time delay current instantaneous trip protection
3．1．RLP3  Current time limit instantaneous trip－“input”；
2．The protection of current IA (IB) IC, any phase sampling speed limit value (equal to or more than that（Idz1）
3．The current time is instant off delay tzd1
4．Protection immediately after the export of C7/C8, while driving the accident signal relay C1/C3 (return after 10s).
  Over-current  
1．RLP6 overcurrent  －“input”；
2．The protection of current IA (IB) IC any phase sampling value is more than the current value（Idz2）
3．The current time or current time delay tzd2
Protection immediately after the export of C7/C8, while driving the accident signal relay C1/C3 (return after 10s).。
Description: more than three of the protection of the direction of the input, in this direction before the action：
Alternate with direction; ("cast" when the point of load: allow a + 3 degrees of error）
when Ubc= —90°,    Ia Range of motion：—135°  to   45°；
when Uca=  150°,    Ib Range of motion：  105° to 285°；
when Uab=   30°,    Ic Range of motion  － 15° to 165°；
reclosing
1．RLP12   reclosure－“input”；reclosure without pressure－“retreat”、reclosure Check synchronization －“retreat”；
2．Switch in the position - after the 15S after the completion of the coincidence gate, and then the liquid crystal display - charging 
3． instantaneous trip / time limit q instantaneous trip .any action / overcurrent (current immediately removed or less than action value)
3．After the first time delay or reclosing time delayTchzd1
Protection immediately exits C9/C10. panel accident light。
After reclosure acceleration
line protection unit
Overload
1．RLP9  Overload－“input”；
2．The protection of current IA (IB) IC any phase sampling value is more than the load value（Idz3）
3．The current time or overload delay tzd3
Protection immediately after the alarm signal is driven by the relay C2/C3 (return to 10s).
Description: if the load need to trip, you need to1．RLP9
2．RLP10 Overload trip-input”
3．The protection of current IA (IB) IC any phase sampling value is more than the load value（Idz3）
4．The current time or overload delaytzd3
  Protection immediately after the export of C7/C8, while driving the accident signal relay C1/C3 (return after 10s).
Zero sequence overcurrent
1．RLP22  Zero sequence overcurrent－“input”；
2．Zero sequence current 3Io sampling value is more than zero-sequence current value（Iodz）
   The current time is no less than zero sequence overcurrent delay
Protection immediately after the alarm signal is driven by the relay C2/C3 (return to 10s).
Description: zero sequence overcurrent trip if required, the need to
1．RLP22 Zero sequence overcurrent－“input”；
2．RLP25  Zero sequence overcurrent trip－input”；
  The current time is no less than zero sequence overcurrent delay
Protection immediately after the export of C7/C8, while driving the accident signal relay C1/C3 (return after 10s).
Low-frequency load shedding
1．RLP19 Low-frequency load shedding－“input”；
2．Protection device frequency sampling value is less than or equal to the low-frequency load reduction（fdz1）
3．(Protection device frequency sampling value is less than or equal to the low-frequency load reduction（fdz1） ≧ Low-frequency load shedding I time delay tfzd1
Protection immediately after the export of C7/C8, while driving the accident signal relay C1/C3 (return after 10s).
earth ground alarm
1．RLP26  earth ground alarm－“input”；
2．The sampling value is more than zero-sequence voltage protection device bus grounding setting（3Uo2）；
3．（Protection of zero-sequence voltage sampling value is more than a bus grounding value (3Uo2) of the time) or bus grounding (delaytzd3）
保Protection immediately after the alarm signal relay C2/C3 (10s return).
PT line-break report  give an alarm  
1．RLP27  PT line-break report give an alarm－“input”；
2．Protection of zero-sequence voltage sampling value is less than or equal to PT break fixed value（3Uo1）；
3．The maximum phase voltage and phase voltage of the smallest difference is greater than or equal to PT break the fixed value or the calculation of zero-sequence voltage value≧10V
4．（Protection of zero-sequence voltage sampling value is more than PT breaking fixed value (3Uo1) of the line delay time is no less than PT)（Tzd3）
Meet the above four conditions device delay 10s, PT disconnection alarm action, protect the alarm signal immediately after the alarm relay C2/C3 (10s return).
low voltage
1．RLp28 low voltage - "cast"; switch in position 
2. Any two-phase voltage sampling value is less than or equal to low voltage value Udz1
3.. Low voltage sampling delay time is more than or equal to low voltage delay (tuzd1) to protect the immediate export C7 / C8, and driving accident signal relay C1 / C3 (10s after return). Accident panel lamp light。
 control loop  line-break
1．RLP control loop  line-break11  －“input”；
2．Protection device control circuit disconnection or time delay control circuit disconnection（Tdz3）；
Protection immediately after the alarm signal is driven by the relay C2/C3 (return to 10s).
Description: the control loop is broken.：
If the switch is in the position of the status, the information of the control loop is broken, the trip coil circuit is disconnected.
If the switch in a state, the "control loop break" information, then the closing coil circuit disconnect
If the switch of the sub - position indicator light is collected, the "control circuit disconnection" information
If the switch of the sub - position indicator is not collected, also made "control circuit disconnection" information