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Sh.C BANK 보호반
Shunt Capacitor Bank is generally used electric power facility that enhances an efficiency of power transmission, constantly maintains a voltage of power system through compensation on reactive power. Along with a difficulty in building a new power generation plant and rapid increase of power demand, an effort for demand management and to maximize usage efficiency of transmission/substation facility has been executed by installing more large capacity Shunt Capacitor Bank every year. Thus, for a stable operation of a power system, an application of professional and credible protection system for Shunt Capacitor Bank has been more conspicuous.
 
Protection relay for 154 [kv] Sh.C Bank has a mixed protection function for a compartment of the Capacitor Bank such as a reactor, condenser combined with series/parallel, and neutral Register. Protection functions such as over-current detection, unbalance detection for a fault detection of each phase of condenser having 2 parallel structures, negative sequence over current detection, over/under voltage detection, and ground over current detection are used. Especially in over current detection, a detection function uses True RMS over current detection including a harmonic wave emitted from Sh.C Bank.
 
GABO’s 154 [kv] Sh.C Bank has a main protection relay 7SJ64 and 7SJ62 made from SIEMENS, in order to guarantee a 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.
   
  SHUNT CAPACITOR BANK PROTECTION SYSTEM CONFIGURATION
 
Depending on a scheme of a Bank, protection functions are different in Sh.C protection system. Generally it is composed with serial reactor, condenser combined with serial/parallel, and neutral point Register. Thus, in three factors which form Sh.C Bank, if any fault occurs, it is sensed as an internal fault. Then a breaker opens. And if external fault occurs, it performs obligation of protection keeping a normal operation by distinguishing it with an internal fault.
   
  154kV SH.C BANK PROTECTION RELAY (7SJ62, 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).
- Directional over current detection (True RMS detection including harmonic wave).
- Negative phase over current detection.
- Unbalance detection on each phase of Sh.C Bank.
- Over/ under voltage detection.
- Frequency detection.
- Over load current 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), Comrade 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