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Transformer protection panelPower transmission is done through remote route between power station and receiving-end. And the efficiency of transmission is directly related to an economic feasibility.
 
Thus, generation voltage is stepped up and transmitted to receiving-end through remote grid. At a receiving-end, through stepping down, a power gets supplied while caring safety of distribution network and power customer.
 
This process of step up and step down is done by power transformer that which is one of the power facilities. Power transformer is important because it influences efficiency, safety, and stability of power transmission.
 
Power transformer is not only one of expensive power facilities which need long time for maintenance and contains multiple potential problems. Problem of power transformer can lead outage of power customer. Thus power transformer protection is directly related to power quality issue, making reliability important.
 
Protection relay needed for protection of transformer has current differential function as main protection. And for back up protection, over current protection is used in each primary side and in secondary side. Especially in secondary side, for NGR protection, ground over voltage protection relay is applied.
 
GABO’s transformer protection panel has a main protection relay 7UT6x 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.
   
  TRANSFORMER PROTECTION SYSTEM CONFIGURATION
 
Transformer protection relay measures current of primary and secondary current, and by using the measurement, it calculates restraint current and differential current. Thus transformer protection relay decides any existence of transformer internal/external fault by using ratio current differential relaying function.
In a transformer, depends on number of winding, it is divided into 2 winding and 3 winding transformer. And current differential relaying function gets calculated by sum of all winding’s current.
   
  TRANSFORMER PROTECTION RELAY (7UT6x)
 
- Digital Protection Relay with 32 Bit high-speed microprocessor.
- Up to 5 winding transformer current differential protection.
- Stable Dual-Slope characteristics
- Phase shift automatic compensation by using 12 Matrix.
- Automatic compensation on primary and secondary currency mismatch by using transformer’s a rated current.
- Magnetizing inrush current detection through second harmonic blocking element.
- Current auto-compensation to CT saturation and CT ratio error, tap changer.
- Convenient function such as Remote setting/ Fault analysis by software.
   
  TRANSFORMER PROTECTION RELAY (7UT6x) RATIO DIFFERENTIAL CHARACTERISTICS CURVE
 
A ratio current differential characteristic for transformer protection is divided into trip area and non-trip area by ratio between restraint current (scalar sum) and that of differential current (vector sum).
In case of transformer protection, it uses phase compensation decided from primary and secondary winding connection. Phase compensation uses vector group such as 30 [deg] x 12 in order to compensate phase difference and to prevent maloperation by zero sequence current.
   
  TRANSFORMER MAGNETIZING INRUSH CURRENT DETECTION
 
A magnetizing inrush current occurs when circuit breaker gets closed and transformer becomes initially energized.
This magnetizing inrush current occurs in primary side and does not pass on to secondary side, which causes differential current between two sides. The differential current function needs a function that prevents mal-operation caused by magnetizing inrush current.
   
  TRANSFORMER PROTECTION RELAY (7UT6x) 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   20[W] ~ 28[VA]
Analog Current   1[A], Burden : 0.05[VA]
  5[A], Burden : 0.3[VA]
 
Power   80/125[V], Power Consumption ≤ 0.3[VA]  
Digital input   Number of digital input : 3 ~ 29
  Voltage Range : 88 ~ 300[VDC]
Selectable
Digital Output   Number of digital output : 4 ~ 24
  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