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

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

3. PAMoS
Portable GIS Partial Discharge Diagnosis System

4. 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

5. 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

6. 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

7. 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

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

9. 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

10. 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

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

12. 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

13. 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

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

15. 1. PD Measuring Point

16. 2. Noise Measuring Point

17. 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

18. THANK YOU !!