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A formation of a power system has a structure that transfers a power from a power source located in suburban area to an urban area that needs a large amount of power demand. A transmission network has parallel dual lines for a power transmission in order to avoid an outage when fault occurs, however as a power customer getting increased there is a dangerous factor which can generate an outage in nationwide when a fault occurs in a transmission network. Thus when medium to large fault occurs there could be an accident in both lines of transmission network, generating a severe problem in stability of power system due to a transmission network or an over current of a generator. Such as solution is needed for maintenance of current distribution and balances in power customer, and a Special Protection System is used for this purpose.
 
A special protection system maintains power system’s stability when a serious fault occurs in power system and constantly supplies power by estimating a maximum current. It is used for a prevention of transition instability at generating end and for a prevention of voltage instability at a power customer’s end. Thus, protection functions such as over-current detection, current detection, negative sequence over current detection, over/under voltage detection, ground over voltage detection, and breaker activation detection are used. Especially current detection function maintains stability through a prompt activation by detecting an open state of facing end through detection function of power change ratio.
 
GABO’s Special Protection function has a main protection relay 7SJ64 made from SIEMENS, in order to guarantee reliability. By having accumulated knowledge in manufacturer technology of protection panel, and experienced professionals, we strive to accomplish noise immunity, stable earthing, durability, insulation, assembly, all of which being incorporated in order to generate products of credibility.
   
  SPECIAL PROTECTION SYSTEM CONFIGURATION
 
A system configuration of Special Protection System shows when dual circuit breaker opens due to a fault in parallel dual circuit transmission network configuration, it implements a function set as to detect any problems. It implements protection factor through calculation of dual circuit voltage, current input, and receives an information of state of a breaker, in which performs as protective role by monitoring in real time basis any existence of fault in transmission lines and operation state.
   
  SPS- SPECIAL PROTECTION SYSTEM PROTECTION RELAY PANEL (7SJ64)
 
CHARACTERISTICS
- Digital Protection Relay with 32 Bit high-speed microprocessor.
- Flexible function (protection functions through inputs of voltage, current, frequency, power etc)
- User define logic through CFC (continuous function chart)
- Text/ Graphic LCD selection for HMI
- Multi-function relay through electric computation through voltage, current and power.
- Supports various protocol (DNP 3.0 PROFIBUS, IEC-61850 etc) for monitor/control
- Visual synchronization through IRIG-B/ DCF 77
- Using any portable computing device, setting and fault analysis function (analysis program (DIGSI), Comrade File conversion function) becomes possible.
 
MAIN FUNCTIONS
- Over current detection (True RMS detection including harmonic wave).
- Power current detection (power ratio change detection).
- Breaker Failure protection
- Directional over current detection (True RMS detection including harmonic wave).
- Negative phase over current detection.
- Frequency detection.
- Over/ under voltage detection.
- Self-diagnosis
- Metering (current, voltage, active/reactive power, etc)
- Event recording (trip, alarm, fail)
- Using any portable computing device, setting and fault analysis function (analysis program (DIGSI), Contrade File conversion function) becomes possible.
   
  TECHNICAL STANDARD/SPECIFICATION
Index Item Specification Remarks
Rating Power Supply Voltage Input   DC : 125[V], AC : 230[V] (Frequency 50/60[hz]) Selectable
Power Consumption   7/9[W], 15/23[VA]
Analog Current   1[A], Burden : 0.05[VA]
  5[A], Burden : 0.3[VA]
 
Power   100[V], Power Consumption ≤ 0.3[VA]  
Digital input   Number of digital input : 8 ~ 48
  Voltage Range : 88 ~ 300[VDC]
Selectable
Digital Output   Number of digital output : 6 ~ 30
  Allowable Current : Continus(5[A]), 30[A](0.5[sec])
Communication Communication Port   RS-232, RS-485, Ethernet, FO(Fiber Optic) Selectable
Protocol   Profibus, DNP3.0, IEC61850, TCP/IP
Time Synchronization   DCF77/IRIG-B/SNTP Selectable