PTMV — 1 3 19 2018 Sensor presentation

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1181569ef530e7debdde70cc215f25b7.ppt

Количество слайдов: 29

Product Scope A Sensor is a device intended to transmit a signal corresponding to the primary current or voltage to the secondary equipment. n © PTMV - 2 - n Power. IT Sensors are typically used in MV switchgears and switches for measuring, protection and indication.

Sensors vs. Instrument Transformers Trends in electrical engineering . . . but not in transformers! Size Performance © PTMV - 3 - Standardisation

Sensors vs. Instrument Transformers Reason: The properties of material used Saturation Unlinear range Linear range Unlinear range © PTMV - 4 - Remedy: Absence of iron

Why did ABB choose Rogowski coil IEC-requirements n Cost effective n © PTMV - 5 - n Low life cycle cost n Size Rogowski coil

Rogowski coil First published in 1912 by Rogowski and Steinhous n Uniformly wound coil with non-magnetic core n Output signal is proportional to the derivate of primary current n © PTMV - 6 - n IEC 60044 -8

Why did ABB choose voltage dividers IEC-requirements n Cost effective n Safe n © PTMV - 7 - n Low life cycle cost n Size Capacitive voltage divider Resistive voltage divider

Voltage divider Resistive divider n Matched resistor pair n n 1: 10 000 divider ratio Today accuracy up to class 1 Capacitive divider n Zc = 1/ C n 1: 10 000 divider ratio Accuracy up to class 3 n © PTMV - 8 - n Small size ideal for bushings IEC 60044 -7

Sensors vs. Instrument Transformers Rated primary current (CT) Ip (log) © PTMV - 9 - Ipr = 240 A

Sensors vs. Instrument Transformers Rated primary current range (sensor) © PTMV - 10 - Ip (log) Ipr = 80 A. . 240 A. . … 1250 A

Sensors vs. Instrument Transformers Accuracy limit factor (Kalf) c Protection class 10 P CS Ip (log) CT © PTMV - 11 - Ipr

Sensors vs. Instrument Transformers Linearity © PTMV - 12 - Typical error, voltage sensor

Sensors vs. Instrument Transformers Transmitted signal level Voltage transformer (ku=1, 9) Voltage sensor 1, 2 - 110 V, 25 VA 12 - 1100 m. V, 80 m. VA At free potential, must be earthed Secondary losses = I 2 R Always earthed in the sensor Secondary losses negligible Current transformer (Kalf =20) Current sensor 0, 25 - 100 A, 5 VA 7, 5 - 3000 m. V, 6 m. VA At free potential, must be earthed Secondary losses = I 2 R At free potential Secondary losses negligible © PTMV - 13 - High power Low signal SAFE

Sensors vs. Instrument Transformers Short-circuited secondary Voltage transformer Isc Voltage sensor 250 M 25 k Isc/Acu = 160 A/mm 2 Temp. 500 C © PTMV - 14 - Explosion within 30 s Isc = Inormal Isc

Sensors vs. Instrument Transformers Open secondary Current transformer Uopen Current sensor Isc 0 - 10 k. V © PTMV - 15 - Isc/Acu = 40 m. A/mm 2

Sensors vs. Instrument Transformers Frequency response rel CT 10 © PTMV - 16 - VS (Cap. ) 10 0 1000 10 000 VT VS (Res. ) F/Hz CS

Sensors vs. Instrument Transformers Secondary wiring Instr. transf. Terminal blocks IED Wiring and screw connections Testing of connections Sensor IED © PTMV - 17 - Integrated cable and connector

Sensors vs. Instrument Transformers Compactness Current transformer Combi Sensor Voltage transformer Small size of active parts © PTMV - 19 - Only one core

Sensor Technology - CT/VT vs. Sensors CT / VT Sensors 1/5 A / 100/110 V 150 m. V / 2 V Excluded Incl. and tested Linearity No Yes Saturation Yes No Yes (VT) No Temperature coefficient No Incl. in accuracy EMC No Shielded Short-circuited secondary Destructive (VT) Safe Open secondary Destructive (CT) Safe 40 -60 kg (CT + VT) 2 -25 kg (Combi) No Yes Signal Secondary cables Ferroresonance Weight © PTMV - 20 - Standardisation possible

Standards for Sensors from ABB are designed, manufactured and tested according to international standards when applicable. Voltage Sensors: IEC 60044 -7 (1999 -12) Instrument transformers – Part 7: Electronic voltage transformers Current Sensors: IEC 60044 -8 (2002 -07) Instrument transformers – Part 8: Electrical current transducers © PTMV - 21 - Combi Sensors: IEC 60044 -3 (1980 -01) Instrument transformers – Part 3: Combined transformers

Sensor, type KEVCD_ n Current Sensor or Combi Sensor n Measurement and protection by one sensor n Dimensions and primary connections same as DIN-type CTs (DIN 42600) n 12, 17. 5, 24 k. V, two types: n n © PTMV - 22 - n A. 1250 A (max. 3200 A) Including coupling electrode for voltage indication

Selection Guide for KEVCD type Sensors Nominal voltage Rated current range (first row) Functions included (second row) < 1250 A I + Uind 1600. . . 3200 A I + Uind KEVCD 12 AE 3 Upto 17. 5 k. V KEVCD 17. 5 AE 3 KEVCD 17. 5 AG 3 KEVCD 17. 5 BE 2 KEVCD 17. 5 BG 2 Upto 24 k. V © PTMV - 23 - Upto 12 k. V KEVCD 24 AE 3 KEVCD 12 AG 3 KEVCD 24 AG 3 KEVCD 12 BE 2 KEVCD 24 BE 2 KEVCD 12 BG 2 KEVCD 24 BG 2

Technical Information in KEVCD Sensor KEVCD 12 AE 3 I-sensor Ipn: 1250 A Ipr (to be advised), options: 80 A 240 A 640 A (Ir of switchgear: 80 -160 A) (Ir of switchgear: 160 -480 A), with adapter (Ir of switchgear: 480 -1250 A), with adapter Output signal: 150 m. V (50 Hz), 180 m. V (60 Hz) © PTMV - 24 - Accuracy: Class 1* / 3 (*with correction factor) U-sensor Division ratio: 10. 000/1 Accuracy: Class 1/3 P Ith / Idyn: 40 k. A, 3 s / 100 k. A Insulation level: 12/28/75 k. V 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