Recloser controls are the front line of the distribution power system, often located on feeders or in distribution substations. Recloser controls supply the intelligence to the network and handle the network protection and in many cases even the RTU functionality. The protective relay senses the faults, assists the vacuum circuit breaker module in an autrecloser to clear the fault on the line.
- Directional sensitive protection elements for over current and earth faults
- Multi communication protocol, Modbus, DNP, IEC -101, -104 and 61850
- 3Io Cos (Active Measuring) and Intermittent (> 150 μs) ground fault detection
- Cabinet and mounting bracket of stainless steel
- Invers and definite time protection
- 4 separate protection groups with automatic power flow direction change
WHAT ISRecloser control
FTU-R200 PROTECTIve RELAY
- Fault clearance functionality and RTU functionality
- Status monitoring – local and remote
- Control – local and remote
- Power quality monitoring – local and remote
- Wave form recording - to a COMTRADE file
- Event recorder for fault analysis
- Metering – local and remote
- Communication – IP or serial
- Multi signalling protocol - DNP3, IEC 870-5-101, IEC 870-5-104, MODBUS
- Currents, Voltages:
- RMS, Phases, Sequence components
- Harmonics to 31st
- Power :
- Apparent, Active, Reactive, Power factor
- Energy : 4-quadrant
- Demand Profile
- Fault passage indicator
- When over-current element starts
- 3-stage over current protection (directional or non-directional)
- Fast and delayed TC trip elements for phase and earth fault
- 54 types of built-in TC Curves and 4 Customized TC Curves
- Definite time over-current element
- Definite time HCT (High Current Trip)
- SEF(Sensitive earth fault) detection
- Auto reclosing (up to 4 shots)
- Direct trip at high over current
- Cold load protection(pickup adjustment)
- Magnetizing inrush restraints
- Sequence coordination
- Open line detection
- Phase sync. fail detection
- Over voltage, under voltage, under frequency
- 4 setting groups, automatic setting group change depending on power flow
ProtectionClassical directional element
- Lagging fault current by line impedance.
- Cross polarized voltage with memory voltage
- Miss-operation for SLG in line with Delta transformer. (Phase angles of three phase currents are same.)
- Angular relationship of symmetrical sequence component currents and voltages can be used to determine direction to fault.
ProtectionImplemented directional element in FTU
- Positive sequence voltage and current are used to detect the direction of phase fault.
- Zero sequence voltage and current are used to detect the direction of ground fault.
- The final result is from the combination of two elements.
- Threshold of quantities can avoid wrong direction.
ProtectionRecloser TC curve
- Curve type : IEC, ANSI, Recloser, Customized
- Time multiplier
- Time adder
- Min. response time
ProtectionRecloser TC curve parameters
Protection3 STAGES OC
- High current (Instantaneous)
- The same reclosing sequence is applied to IDMT, DMT.
- High current has separate reclosing count
ProtectionSEF (Sensitive Earth Fault)
- Core balance CT for extreme low earth fault detection. (0.1A > 63KΩ)
- Core balance CT is needed for ungrounded system
- Residual zero-sequence voltage is calculated internally
- Adjustable protection zone -+30 – 90 degrees
- Cos/sin θ algorithm
ProtectionEarth fault currents in ungrounded system
- Magnetizing inrush current detection based on 2nd harmonic components in the current
- Cold-load pickup : Pickup is multiplied during cold-load time
- Inrush pickup : Pickup is multiplied during inrush time
- Fast reclosing offers a relative high probability of rapid restoration of service for overhead distribution line.
- 4 reclosing attempts to restore service before locking out.
- If fast reclosing is unsuccessful, the interrupter will go to lock out.
- Direct lockout at high current faults.
- Reclosing is generally not used for undergrounded feeders, as cable faults are more inclined to be permanent.
- Trip to lockout is settable for phase, ground fault, and SEF respectively
- Fast(instantaneous) element operation count can be set for phase and ground fault respectively
- Dead times are settable for each shot(reclosing)
- Separate dead times and reset time for SEF
- Single shot operation : If the fault occurs in the set time after closing, recloser goes to lockout
- Sequence coordination function is available
- Sag, Swell, Interruption Detection
- Events : Time-stamp, Magnitude, Duration
- Counters : Statistics for each phase, duration classified by IEEE 1159.
- Accumulated interruption time
- Waveform recording on events
- Logs to a COMTRADE file
- THD (Total harmonic distortion)
- Each components up to 31th harmonics
- Events by threshold setting, Counter
- Voltage & current unbalance
- Definite time characteristics