1/23/2003. Sensor presentation
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1 1/23/2003 Sensor presentation
2 Product Scope A Sensor is a device intended to transmit a signal corresponding to the primary current or voltage to the secondary equipment. Power IT Sensors are typically used in MV switchgears and switches for measuring, protection and indication.
3 Sensors vs. Instrument Transformers Trends in electrical engineering... but not in transformers! Size Performance Standardisation
4 Sensors vs. Instrument Transformers Reason: The properties of material used Saturation Unlinear range Linear range Unlinear range Remedy: Absence of iron
5 Why did ABB choose Rogowski coil IEC-requirements Cost effective Low life cycle cost Size Rogowski coil
6 Rogowski coil First published in1912 by Rogowski and Steinhous Uniformly wound coil with non-magnetic core Output signal is proportional to the derivate of primary current IEC
7 Why did ABB choose voltage dividers IEC-requirements Cost effective Safe Low life cycle cost Size Capacitive voltage divider Resistive voltage divider
8 Voltage divider Resistive divider Matched resistor pair 1: divider ratio Today accuracy up to class 1 Capacitive divider Zc = 1/ωC 1: divider ratio Accuracy up to class 3 Small size ideal for bushings IEC
9 Sensors vs. Instrument Transformers Rated primary current (CT) ε Ip (log) Ipr = 240 A
10 Sensors vs. Instrument Transformers Rated primary current range (sensor) ε Ip (log) Ipr = 80 A A A
11 Sensors vs. Instrument Transformers Accuracy limit factor (K alf ) ε c Protection class 10P CS Ip (log) CT Ipr
12 Sensors vs. Instrument Transformers Linearity % Voltage error Error limit, class 3P Typical error, voltage transformer Typical error, voltage sensor U/Un %
13 Sensors vs. Instrument Transformers Transmitted signal level Voltage transformer (ku=1,9) 1,2-110 V, 25 VA At free potential, must be earthed Secondary losses = I 2 R Current transformer (Kalf =20) 0, A, 5 VA At free potential, must be earthed Secondary losses = I 2 R Voltage sensor mv, 80 mva Always earthed in the sensor Secondary losses negligible Current sensor 7, mv, 6 mva At free potential Secondary losses negligible High power Low power Low signal SAFE
14 Sensors vs. Instrument Transformers Short-circuited secondary Voltage transformer Voltage sensor I sc 250 MΩ 25 kω I sc Isc/Acu = 160 A/mm 2 Temp. 500 C Explosion within 30 s Isc = Inormal
15 Sensors vs. Instrument Transformers Open secondary Current transformer Current sensor Uopen Isc 0-10 kv Isc/Acu = 40 ma/mm 2
16 Sensors vs. Instrument Transformers Frequency response εrel CT F/Hz VS (Cap.) VT VS (Res.) CS
17 Sensors vs. Instrument Transformers Secondary wiring Instr. transf. Terminal blocks IED Wiring and screw connections Testing of connections Sensor IED Integrated cable and connector
18 Secondary cabling of sensors Sensor IED S1 S2
19 Sensors vs. Instrument Transformers Compactness Current transformer Combi Sensor Voltage transformer Small size of active parts Only one core
20 Sensor Technology - CT/VT vs. Sensors CT / VT Sensors Signal Secondary cables 1/5A / 100/110 V Excluded 150mV / 2V Incl. and tested Linearity No Yes Saturation Yes No Ferroresonance Yes (VT) No Temperature coefficient No Incl. in accuracy EMC No Shielded Short-circuited secondary Destructive (VT) Safe Open secondary Destructive (CT) Safe Weight kg (CT + VT) 2-25 kg (Combi) Standardisation possible No Yes
21 Standards for Sensors Sensors from ABB are designed, manufactured and tested according to international standards when applicable. Voltage Sensors: IEC ( ) Instrument transformers Part 7: Electronic voltage transformers Current Sensors: IEC ( ) Instrument transformers Part 8: Electronic current transformers Combi Sensors: IEC ( ) Instrument transformers Part 3: Combined transformers
22 Sensor, type KEVCD_ Current sensor or Combi Sensor Measurement and protection by one sensor Dimensions and primary connections same as DIN-type CTs (DIN 42600) 12, 17.5, 24 kv, two types: A. </= 1250 A B. > 1250 A (max A) Including coupling electrode for voltage indication
23 Selection Guide for KEVCD type Sensors Nominal voltage Rated current range (first row) Functions included (second row) < 1250 A A I + U + U ind I + U ind I + U + U ind I + U ind Upto 12 kv KEVCD 12 AE3 KEVCD 12 AG3 KEVCD 12 BE2 KEVCD 12 BG2 Upto 17.5 kv KEVCD 17.5 AE3 KEVCD 17.5 AG3 KEVCD 17.5 BE2 KEVCD 17.5 BG2 Upto 24 kv KEVCD 24 AE3 KEVCD 24 AG3 KEVCD 24 BE2 KEVCD 24 BG2
24 Technical Information in KEVCD Sensor I-sensor Ipn: 1250 A KEVCD 12 AE3 Ipr (to be advised), options: 80 A (Ir of switchgear: A) 240 A (Ir of switchgear: A), with adapter 640 A (Ir of switchgear: A), with adapter Output signal: 150 mv (50 Hz), 180 mv (60 Hz) Accuracy: Class 1* / 3 (*with correction factor) U-sensor Division ratio: /1 Accuracy: Class 1/3P Ith / Idyn: 40 ka, 3s / 100 ka Insulation level: 12/28/75 kv Frequency: 50/60 Hz With ribs on top Secondary cable (length to be advised), options: 5 m, 6.5 m or 7.5 m Primary polarity (to be advised), options: Normal or reversed Coupling electrode for voltage indication included
25 PTMV Sensor concept
26 Sensors in use around the world In use in 56 countries More than sensors in operation
27 Sensors in use around the world
28 Arguments for Sensors Safety Short delivery time Smart integration
29
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