SPD(Surge Protection Devices, 서지 보호기)의 기술이해 2007년 PGS & eca3G 연구소
SPD의 기술 자료 과도전압의 발생원 Lightning Static discharges Switching transients Power cable induction Nuclear Electro Magnetic Pulse Source Field Density Rise Time Lightning 3V/m 600V/µs @10km Static discharge 20kV 2kV/ns at impact NEMP 50 kV/m 5kV/ns @500km 90% 50% 10% I (10KA) PK 8µs 20µs t 1.2µs 50µs t 90% 50% 10% V PK 8/20µs Short-circuit Current Pulse - IEC 60-1 1.2/50µs Open-circuit Voltage Pulse
SPD의 기술 자료 Impulse Ringwave IEEE C62.41-1991 Service Entrance Category C3 Panelboard Category B3 Branch Panel Category A1 10kV(1.2,50µs) 6kV(1.2,50µs) 10kA(8/20µs) 3kA(8/20µs) Ringwave 6kV/500A 100kHz IEEE C62.41-1991
Surge Suppression diode Multiple current paths SPD의 기술 자료 1 2 Electronic Apparatus 2-electrode GDT in 2-wire loop 3-electrode gas discharge tube Surge Suppression diode 1500W surge rating Conventional diode 5W steady state rating Surge Diodes Power absorption throughout pellet volume Multiple current paths Metal oxide particles Varistors (MOV)
SPD의 기술 자료 Secondary Element Characteristics Multi-stage SPD Operation MOV Surge Diode V I Secondary Element Characteristics Device Speed Sensitivity Energy Stability Air Gap Fast Poor High Poor GDT Fast Good High Good Zener V Fast V Good Low Excellent Transorb V Fast Good Medium Excellent Varistors V Fast Poor High Poor Relays V Slow Good Medium Good Fuses Slow Fair Medium Good Multi-stage SPD Operation SPD의 내부 MOV소자
SPD의 기술 자료 Cat A Cat C Cat B IEEE C62.41 Locations Incoming Surge SPD DC Power Incoming Surge
SPD의 기술 자료 SPD SPD
SPD가 열화 및 노화되어 화재•폭발 사례
SPD가 열화 및 노화되어 화재•폭발 사례
SPD가 열화•노화되어 기능을 못 하면? SPD SPD SPD
SPD의 열화 및 노화를 진단한 사례