AMoS Advanced Total On-line Monitoring & Diagnosis System for GIS

PAMoS Portable GIS Partial Discharge Diagnosis System

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Contents

1. PAMoS

Portable GIS Partial Discharge Diagnosis System

2. Noise Processing Technology

3. Ahn Kang Hydrelectric Power Plant 330kV GIS

Partial Discharge Diagnosis

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1.PAMoS

Portable GIS Partial Discharge Diagnosis System

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50 Ω50 Ω50 ΩImpedance

Link N-Type connector

> - 11 dBm ( 79 μW)

0.5 ~ 1.5 GHz

< 2 pC

GIS Indicating window

embedded sensor

Link N-Type connector

-22 dBm (6 μW )

0.5 ~ 1.5 GHz

< 5 pC

Open Barrier type Spacer

external sensor

< 5 pCsensitivity (pC)

Metal closed barrier-type spacermounting method

0.5 ~ 1.5 GHzfrequency range

Link N-Type connector

-24.4 dBm (3.6 μW )

items

cable connection method

sensor output(5pC)

Internal Internal External External ExternalExternal

UHF PD SensorUHF PD Sensor

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Item Contents

Input voltage AC 90~240V

Min. detection signal < - 60dBm (= 0.001μW)

Over voltage protection

Built-in surge protector

Input channel4 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

PAMoSPAMoS

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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 .

PAMoS Operation and

connection methods

Notebook PCNotebook PC

LAN CableLAN Cable

Power Switch Power Switch

Power CablePower CableCoaxial CableCoaxial Cable

Noise SensorNoise SensorExternal UHF PD SensorExternal UHF PD Sensor

PD Signal Processing UnitPD Signal Processing Unit

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Floating Electrode - no free moving Protrusion Electrode

Form of general partial discharge inside GIS (examples)Defect Type

Free Moving Particle Defective Insulator

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2. Noise Processing Technology

1) 4-step Noise elimination mothod 4-step Noise elimination method PRPS algorithm

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1. Spacer shielding1. Spacer shielding

Band pass filter with selectable frequency rangeShield Noise to Spacer

2. Filter Matrix2. Filter Matrix

Noise-processing technology (4-step)1

0 500 1000 1500 2000-110

-100

-90

-80

-70

-60

-50

-40

600 700 800-110

-100

-90

-80

800 900 1000

-110

-100

-90

-80

-70

-60

Po

we

r m

ea

sure

d (

dB

m)

Frequency (MHz)

Direct Filtered

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3. Gating Method3. Gating Method

Gating On

Gating Off A Phase

B Phase

C Phase

Noise

A Phase

B Phase

C Phase

Noise

Internal UHF PD sensor

Noise Antenna

Noise only

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Gating OnGating Off

PD Data + Noise PD Data

PRPS - patented

PRPD

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4. Neural Network4. Neural Network

Real-time comparison with DB Library and analysis, remote upgrading SW Real-time comparison with DB Library and analysis, remote upgrading SW

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0 cycle 120 cycle ( 2 sec) 240 cycle 360 cycle 480 cycle 10 Seconds Consecutive measuring Data / 60Hz

600 cycle ( 10 sec)

PRPS Analysis

Store 10 seconds consecutive data : determine PD existence via overlapped consecutive signal analysis

PRPD

Not PDNot PD

PDPD

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3. Ahn Kang Hydroelectric Power Plant 330kV GIS

Partial Discharge Diagnosis

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1. PD Measuring Point1. PD Measuring Point

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2. Noise Measuring Point2. Noise Measuring Point

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3. Diagnosis Result ( 3302-B bay ( examples ) )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

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THANK YOU !!THANK YOU !!