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In a Power System, substation is an assembly of technology and facility that carry out major functions such as distribution of power, up-down transform voltage and protection and control of system.
 
Within system, a busbar offers as an important function of which power gets concentrated and distributed through transmission lines. Thus in a busbar, an effect of fault goes on whole substation, which can lead into a severe black out accident by large fault current. In order to prevent this, multiple circuit breaker and switch gear are composed as parts of double busbar protection.
   
  DOUBLE BUSBAR STRUCTURE
 
With the importance of busbar, in a double busbar structure, protection system is divided into Bus 1 and Bus 2 protection zone. Each of them protects system separately so as to save outage time when there is maintenance and accident. Also through incoming and outgoing current of whole busbar, Check Zone protection function checks internal fault.
Main protection used in busbar protection includes current differential relay (87T). And backup protection includes under voltage protection relay using primary and secondary side’s voltage transformer (VT) input source.
GABO’s busbar protection panel has main protection relay including Central Unit (7SS522) combined with Bay Unit (7SS525) made from SIEMENS. By having accumulated knowledge in manufacturer technology of protection panel, and with experienced professionals, we strive to accomplish noise immunity, stable earthing, durability, insulation, assembly, all of which being incorporated in order to generate credible products.
   
  BUSBAR PROTECTION SYSTEM CONFIGURATION
 
Busbar protection system is organized into Central Unit and Bay Unit. A Bay Unit measures current and control switchgear of each bay. And Central Unit checks internal fault of busbar by obtaining information from each Bay Unit.
   
  CENTRAL UNIT & BAY UNIT (7SS5x)
 
- Digital Protection Relay with 32 Bit high-speed microprocessor.
- Substation system configuration in graphics by using DIGSI software.
- Supports up to 12 Bus zones, and up to 12 Bus couplers.
- Selectable up to 48 Bus Units, and many Bus bar Protection.
- Independent and separate setting of Bus Zone and Check Zone.
- Accurate detection on internal/external fault by using a differential current protection.
- Offers selectable protection zone (Bus zone, Check zone) of multiple busbar system.
- Control and measurement of each Bay unit in Central unit.
- Enhancement of stability and speed of a system through fiber-optic connection.
- Stable activation through ratio current differential characteristics.
- Auto-compensation functions on current transformer ratio mismatch.
- Convenient function such as Remote setting/ Fault analysis by software.
 
 
 
 
 
   
  DIFFERENTIAL CURRENT PROTECTION CHARACTERISTICS CURVE
 
Depending on a ratio between restraint current and differential current, it is divided into trip zone and non-trip zone. A restraint current has a stable restraint property that which compensates a current transformer error and CT saturation.
   
  CENTRAL UNIT & BAY UNIT (7SS5x) MAIN FUNCTIONS
 
- Current differential protection (independent protection function on each phase) - User defined logic (CFC-continuous function chart).
- Breaker Failure protection - Function to prevent mal-function through many fault detection.
- Prevention of mal-operation by using CT saturation detection - Self-diagnosis
- Current transformer ratio mismatches compensation through setting - Selection possible to one pole/three pole trip function
- Circuit breaker status check function through low current detection - Metering (current, voltage, active/ reactive power, etc)
- End fault protection between current transformer and circuit breaker - Event recording function (trip, alarm, fail, etc)
- High speed tripping function - Using any portable computing device, setting and fault analysis function (analysis program (DIGSI), Comrade File conversion function) becomes possible.
   
  CU & BU (7SS5X) TECHNICAL SPECIFICATION/STANDARD
Index Item Central Unit Bay Unit
Rating Power Supply Voltage Input   DC : 48/60, 110/125, 220/250 [V]
Power Consumption   35[W] ~ 135[VA] 16[W]
Analog Current   1[A], Burden : 0.1[VA]
  5[A], Burden : 0.2[VA]
 
Digital input   Number of digital input : 12
  Voltage Range : 88 ~ 300[VDC]
  20(10)
  88 ~ 300[VDC]
Digital Output   Number of digital output : 16+1
  Allowable Current : Continus(5[A]), 30[A](0.5[sec])
  5+1+1
  Continus(5[A]), 30[A](0.5[sec])
Communication Communication Port   RS-232, RS-485, Ethernet, FO(Fiber Optic) RS-232, FO(Fiber Optic)
Protocol   Profibus, DNP3.0, IEC61850, IEC60870, TCP/IP  
Time Synchronization   DCF77/IRIG-B/SNTP Selectable