AMoS Advanced Total On-line Monitoring & Diagnosis System for GIS PAMoS Portable GIS Partial Discharge Diagnosis System

Contents 1. PAMoS Portable GIS Partial Discharge Diagnosis System 2. Noise Processing Technology 3. Ahn Kang Hydrelectric Power Plant 330kV GIS Partial Discharge Diagnosis

PAMoS Portable GIS Partial Discharge Diagnosis System

UHF PD Sensor Internal External External items embedded sensor external sensor mounting method GIS Indicating window Open Barrier type Spacer Metal closed barrier-type spacer sensitivity (pC) < 2 pC < 5 pC < 5 pC frequency range 0.5 ~ 1.5 GHz 0.5 ~ 1.5 GHz 0.5 ~ 1.5 GHz sensor output(5pC) > - 11 dBm ( 79 μW) -22 dBm (6 μW ) -24.4 dBm (3.6 μW ) Impedance 50 Ω 50 Ω 50 Ω cable connection method Link N-Type connector Link N-Type connector Link N-Type connector

PAMoS Adopt Industrial Emission Standard Item Contents Input voltage AC 90~240V Min. detection signal < - 60dBm (= 0.001μW) Over voltage protection Built-in surge protector Input channel 4 Channel/Unit (simultaneous, consecutive measurement) Communication TCP/IP (IEEE802.x) Processor Dual 600 MHz DSP Filter User selection ( 3 steps ) Gating Enable to select Multi-Channel EMC Adopt Industrial Emission Standard

PAMoS Operation and connection methods PD Signal Processing Unit Notebook PC 1. Connect the power cable of the Main body of PMAoS and Notebook computer 2. Connect the TCP/IP LAN cable between the Main body and Notebook computer 3. Connect the UHF Sensor and Noise sensor to PMAoS with coaxial cable 4. When the connection is ready, turn on the power switch and check LED lamp is on (red: power lamp, yellow: communication lamp) 5. When lamp is on, Connection is ready . LAN Cable PD Signal Processing Unit Power Switch Power Cable Coaxial Cable External UHF PD Sensor Noise Sensor

Floating Electrode - no free moving Defect Type Form of general partial discharge inside GIS (examples) Floating Electrode - no free moving Protrusion Electrode Free Moving Particle Defective Insulator

2. Noise Processing Technology 1) 4-step Noise elimination mothod 4-step Noise elimination method PRPS algorithm

Band pass filter with selectable frequency range Noise-processing technology (4-step) 1 1. Spacer shielding 2. Filter Matrix Shield Noise to Spacer Band pass filter with selectable frequency range

3. Gating Method Gating Off Gating On Noise only Gating Off Internal UHF PD sensor A Phase C Phase B Phase Noise Noise Antenna Gating On A Phase C Phase B Phase Noise

Gating Off Gating On PD Data + Noise PD Data PRPS - patented PRPD

Real-time comparison with DB Library and analysis, remote upgrading SW 4. Neural Network Real-time comparison with DB Library and analysis, remote upgrading SW

PRPS Analysis Store 10 seconds consecutive data : determine PD existence via overlapped consecutive signal analysis PRPD Not PD 0 cycle 120 cycle ( 2 sec) 240 cycle 360 cycle 480 cycle 600 cycle ( 10 sec) 10 Seconds Consecutive measuring Data / 60Hz PD

3. Ahn Kang Hydroelectric Power Plant 330kV GIS Partial Discharge Diagnosis

1. PD Measuring Point

2. Noise Measuring Point

3. Diagnosis Result ( 3302-B bay ( examples ) ) PD Sensor Noise Sensor Noise Gating result Monitoring the signal inside GIS and the external noise signal by using Band Pass Filter Applying noise gating function to each monitored signal Eliminating with gating the internal signal by the external noise signal Identifying the incoming internal signal by the external impulse noise

THANK YOU !!