Overcurrent and Arc Protection by Reyrolle Alexander Erokhin. 21, 2017 I Berlin

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1 Overcurrent and Arc Protection by Reyrolle Alexander Erokhin VAR Partner Day September 20-21, 21, 2017 I Berlin

2 Reyrolle Product Range by SIEMENS Challenges We Meet for our Customers Easy-to-use protection devices for smaller budgets and basic functionality applications Withdrawable design allows easy installation and replacement and dramatically reduces downtime Parameterization via front panel and via PC Free-of-charge software Easy-to-use menu structure reduces operator learning time (learn one, know all) Comprehensive protection package as standard Distribution Industry Sub-Transmission Industrial Page 2

3 7SR11 and 7SR12 Argus: Overcurrent and EF Relays Withdawable metal case Automatic CT shorting Hardware versions: -1 CT (EF or SEF) - 4 CT s (3 PH + EF or SEF) - 4 CT s and 3 VT s PSU: V DC/ V AC BI Threshold: 19V or 88V 3 BI / 5 BO or 6 BI / 8 BO 10 LED s (programmable) Front USB/rear RS485 standard 2 x Optical Duplex Ethernet or 2 x Electrical Ethernet - option IEC103, Modbus RTU, DNP 3 IEC61850 option E4 Case: Without IEC EN100+ E6 Case: With IEC Page 3

4 7SR10 Argus: Overcurrent and EF Relay Non-withdrawable polycarbonate case (E4 only) Hardware versions: 4 CT s (3 PH + EF or SEF) 4 CT s and 3 VT s expected December 2017 PSU versions: V AC/DC, BI 44V AC/DC V AC/DC, BI 88V AC/DC 24-60V DC, BI 19V DC Basic Relay Version: 3BI / 3BO Front USB only Extended Relay Version: 6BI / 6BO Front USB port and rear RS485 port IEC103, Modbus RTU, DNP3 10 LED s (programmable) CB control buttons on front panel Page 4

5 7SR1* Argus Overcurrent Relays: ANSI Protection Functions 27/59** U/O Voltage 37 Undercurrent 81U/O U/O Frequency 32 Power (Directional, U/O Power) 55 Power Factor 46BC Broken Conductor/Load Unbalance 46NPS Negative phase sequence OC 47 Negative Phase Sequence Voltage 49 Thermal overload 51V Voltage Controlled OC 59 N Neutral Voltage Displacement 67/50 Dir.Instantaneous PH OC 67/50G/50N Dir.Measured/Derived Inst. EF 67/50SEF Instantaneous SEF 67/51 Directional Time Delayed OC 67/51G/51N Dir. Meas./Derived Time Del. EF 67/51SEF Time Delayed SEF 64H High Impedance REF 81HBL2 Inrush Restraint 51C Cold Load Pickup 50BF Circuit Breaker Fail 74T/C Trip & Close Circuit Supervision 60CTS CT Supervision 60VTS VT Supervision 86 Lockout 50AFD Arc Flash Fast Clearance (for use with ReyArc Arc fault protection) Option: 79 Auto-Reclose **Highlighted RED: CT+VT (directional) relay only Page 5

6 7SR45 CT-Powered Overcurrent and EF Relay Non-withdrwable polycarbonate case (E4 only) CT-powered 3-phase non-directional OC relay Front USB port: relay configuration via PC and for back-up power to view/download settings, faults and events High Sensitivity: trip-ready at 20% of In (single-phase) via low-energy Pulse Output or Binary Output 7SR45 designed for following applications: In locations without auxiliary power supply Ring Main Units (RMU) Wind Farms Back up protection in MV applications Retrofit in Control and Relay panels instead of old electromechanical protection relays Page 6

7 7SR45 Relay: Version 1 and Version 2 V2 November 2017 Analogue Input Configuration 4x CT inputs (1A and 5A terminals). 50 or 60Hz Binary Inputs (V2) 4 programmable BI 19 V V DC. Binary Outputs (V2) 4 programmable BO Operating mode: Latched / self reset Power Supply (V2) 24-60V DC VAC/DC Comms Interface (V2) USB (front) + RS485 (rear) RS485: Modbus RTU / IEC103 Analogue Input Configuration 4x CT inputs (1A and 5A terminals) 50 or 60Hz Binary Inputs (V1) 2 programmable BI 19 V V DC Binary Outputs (V1) 2 programmable BO Operating mode: Latched / self reset Power Supply (V1) n/a ( CT Powered ) Comms Interface (V1) Front USB port Pulse Output (V2) 24VDC, 0.1Ws Pulse Output (V1) 24VDC, 0.1Ws Flag Output (V2) For External Flag indicator Page 7

8 Arc Fault vs Metallic Short Circuit Arc Fault a flashover between two poles or to earthed parts Metallic Short Circuit: - low impedance fault path - current flow is hundreds of times higher than normal load current - cleared by using IDMT and DTL overcurrent relays Arc Fault plasma discharge (hot ionized gas between electrodes) - high impedance fault path (due to the arcing impedance) - current flow is only 40% to 90% of a metallic short circuit Protection Implications for Arc Faults: For moderate arc fault currents, IDMT characteristic may be too slow For very low arc fault currents, DTL instantaneous low enough and protection may not operate characteristic can not be set Page 8

9 Causes of an Arc Fault Electrical Arc short circuits occur in metal-clad air-insulated MV switchgear and LV panels for the following reasons: Ageing insulation materials Ingress of moisture and dust, rodents Poor bus or cable connections Corrosion of electrical contacts Overvoltages Poor maintenance or human error The greatest risks of Arc Fault damage exist in: CB cable termination due to ingress of moisture and rodent damage CB chamber due to slow clearance times of the IDMT feeder protection Page 9

10 Effects of an Arc Fault ARC develops in 1msec. The resistance varies The energy is proportional to ~ I² x t I²t, ka² s Steel melts Busbar melts Toxic fumes Cable fire Trip time with fast breaker + ARC protection 7 + ( ) msec msec Page 10

11 Reyrolle Arc Fault Protection: System Components Options 7XG3130 RA30 High speed arc sensor with one or two optical detectors 7XG3123 RA23 Arc fault interface module with one or two arc sensor inputs, one arc detection output and one sensor supervision/module fail output 7XG3120 RA20 Arc fault monitor relay with two or three arc sensor inputs, two high speed tripping duty outputs and one sensor supervision/sodule fail output Page 11

12 7XG3130 RA30 Optical Sensor Features: Fitted with one or two Optical Detectors Provides forward detection through 180 o Single-detector Sensor (through-hole sensor) 3m detection range 5 6 m spacing Detects both direct and reflected arc light => mounting position is not critical Allows for Arc Sensor positioning inside or outside the switchgear compartment => suitable for retrofits Optical sensitivity 10,000 Lux => insensitive to day light or general artificial lighting Dual-detector Sensor 5 6 m spacing Page 12

13 7XG3123 RA23 Module RA23 must interface with a numeric overcurrent relay; will not work on it is own The RA23 outputs are fed into BI of the overcurrent relay Overcurrent relay will perform circuit breaker trip and RA23 supervision alarm Arc trip may be current checked using a fast overcurrent element in the Overcurrent Relay Arc trip may also be implemented without an overcurrent check (flash only) Page 13

14 RA23: Typical Application Scheme Arc Fault Coverage of a Feeder Exit 1) Sensor installed in the CT chamber RA23 and Overcurrent Relay combination provide CB Tripping 2) Sensor installed in the Cable Termination chamber Page 14

15 7XG3120 RA20 Module DIN rail or surface mounting Status Indications Suitable for retrofit applications Two high speed tripping duty contacts Trip for Arc fault only can also be implemented without an overcurrent relay Self supervision and Sensor supervision provided with a single Alarm output Push button reset Auxiliary supply options for AC or DC System healthy RA30 Power up test OK Arc fault trip RA30 Arc Sensor 1 service RA30 Arc Sensor 2 or 3 service Green solid Flash green 3 times Solid red for 2s followed by: Alternate red & green until reset. Orange solid Orange flashing RA30 Arc Sensor continuous pick up Alternate orange & red. Page 15

16 RA20: Typical Application 1 Arc Fault Coverage of a Feeder Exit - 1 Can be combined with an existing overcurrent relay on retrofit solution 1) Sensors installed in the CT chamber RA20 and overcurrent relay combination provide CB Tripping 2) Sensors installed in the Cable Termination chamber Page 16

17 RA20: Typical Application 2 Arc Fault Coverage of a Feeder Exit - 2 3) Sensors installed in the CB chamber 1) Sensors installed in the CT chamber RA20 trip can be combined with an upstream Overcurrent Relay to trip Bus CB RA20 and Overcurrent Relay combination provide CB Tripping 2) Sensors installed in the Cable Termination chamber Page 17

18 RA20: Typical Application 3 Arc Fault Coverage of a Bus chamber and Feeder CB chambers 3) Sensors installed in the Bus chamber 2) Sensors installed in the CB chamber RA20 module provides Bus CB Tripping 1) Sensors installed in the Cable Box RA20 module and Overcurrent Relay combination provide CB Tripping Page 18

19 SPDL Contact Details: Alexander Erokhin Regional Sales Manager Siemens plc / Great Britain / SPDL North Farm Road Hebburn NE31 1LX, UK Telephone: Fax: Mobile: siemens.at Page 19

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