Guodian NARI NSP788 microcomputer integrated protection
1.1 Scope of application
NSP788 Line protection measurement and control device Applicable to 110kV The line and feeder protection and measurement and control devices in the indirectly grounded or small resistance grounded systems with the following voltage levels can be installed in the switch cabinet in a decentralized manner or in the control room in a centralized panel mode.
1.2 Function configuration
1.2.1 Protection function
1) Three section overcurrent that can be blocked by complex voltage and direction (of which the III paragraph Can be set to inverse time limit mode)
2) Two Section zero sequence overcurrent （ Zero sequence current can be self generated or externally applied ）
3) Overcurrent acceleration
4) zero sequence too Flow acceleration （ Zero sequence current can be self generated or externally applied ）
5) Overcurrent Charging protection
6) zero sequence too flow Charging protection（ Zero sequence current can be self generated or externally applied ）
7) Overload Inform police
8) Low cycle load shedding
9) low Pressure Load shedding
10) Three phase primary reclosing
11) Small current grounding line selection （ Zero sequence current can be self generated or externally applied ）
12) Synchronous closing function (remote closing or manual closing);
13) Reverse power protection
14) FC Overcurrent lockout
15) Low voltage disconnection
16) a bus or bus bar PT Disconnection report police
17) line PT Disconnection report police
18) Separate operating circuit
19) Fault recording
1.2.2 Measurement and control function
1) telemetering: Ua 、 Ub 、 Uc 、 Uab 、 Ubc 、 Uca 、 Ia 、 Ib 、 Ic 、 P 、 Q 、 F 、 COS 、 3I0 、 3U0 Equal basic quantity.
2) Remote signaling: local remote signaling: forty-two Road, which can be extended to fifty-eight Road;
3) Remote control: by default, one group is fixed as circuit breaker opening/closing, and the other group can be used to control the knife switch. Six groups of hard contact remote control can be supported by changing more expansion boards.
1.2.3 Accessibility
N Self check function
n Alarm for DC power failure
n On line detection of hardware circuit
n Event records include five hundred and twelve Secondary input displacement report , 512 Self inspection report and five hundred and twelve Operation report
n Disturbance records include one hundred and twenty Sub fault report and one hundred and twenty Secondary fault recording (the disturbance recording format is the same as that of the international standard COMTRADE File compatibility)
n Support multiple time synchronization modes: pulse division（ 1PPM ）, second pulse（ 1PPS ）， IRIG-B Code sum IEC61588 network timing
1.2.4 Communication function
n three Ethernet interface support IEC 61850 or IEC 60870-5-103 Statute
n 1 individual RS-232 Communication serial port for printing
n one individual RS-485 （ EIA ）Differential bus interface is used for timing signal input
n one Ethernet ports can be the same as auxiliary software NSRTools Connect for testing and configuring the unit
