Wilsonville SFRA.pdf

7/24/2019 Wilsonville SFRA.pdf

http://slidepdf.com/reader/full/wilsonville-sfrapdf 1/65

Sweep Frequency Response Analysis (SFRA)

Assessing the Mechanical Integrity of Power Transformers

What is SFRA?

• Powerful and sensitive tool to assess the

mechanical and electrical integrity of

power transformers active part

• Measurement of the transfer function

over a wide frequency range

SFRA Discussion Outline

1. Basic SFRA Theory, History, and Evolution

2. SFRA Measurement Characteristics

3. Failure Modes4. Test Plans

5. Test Procedures

6. SFRA Relationship to Other TransformerDiagnostics

7. Analysis of Results

Diagnostic Category

• Dielectric

• Thermal

• “Mechanical ”

• Use SFRA:

1. Transportation

2. Post Fault

FRA Industry Groups

• CIGRE WG A2.26 (Guide)

• DL 911/2004 (Standard)

• IEC 60076-18 (Draft)

• IEEE WG PC57.149 (Guide) D8

Standardization in the World

DL 911/2004PC57.149/D8

WG A2.26

IEC 60076

http://slidepdf.com/reader/full/wilsonville-sfrapdf 7/65© OMICRON

Available Documents

Cigré Brochure 342 DL 911/2004

Available Documents

IEC 60076-18 IEEE PC57.149

Transformer Tests

Dielectric Thermal Mechanical

DGA DGA SFRA

Oil Screen Oil Screen Leakage Reactance

PF/TD CAP IR PF/TD CAP

Exciting Ima DC Winding RES Exciting Ima

Turns Ratio Tests DC Winding RES

Insulation Resistance

Transformer Test Protocol

1. Overall Power Factor and Capacitance

2. Bushings (C1, C2, Energized Collar)

3. Exciting Current

4. Surge Arresters

5. Insulating Fluids

6. Leakage Reactance

7. Turns Ratio Test

8. Insulation Resistance

10. DFR

11. SFRA

12. DC Winding Resistance

Life Cycle

Delivery Port

Reception Port

Manufacturer Workshop

•Quality Assuring

• After Short Circuit Test

•Failure Investigation

•Transport Checking

•Routine Measurement

• After Transients/Overcurrents

•Failure Investigation (DGA)

Truck Transport 1

Truck Transport 2

Ship Transport

The SFRA Measurement Principle

Transformator

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

f in MHz

|TFU2/U1(f)|inV/V|

-200.0

-150.0

-100.0

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

f in MHz

arc(TFU2/U1(f))indeg

Betragsfunktion

|TFU2/U1(f)|Phasenfunktion

arc(TFU2/U1(f))

Erregungssignal

(variable Frequenz)Antwortsignal

0 50 100

Zeit t in µs

SpannungU1/U1inV/V

0 50 100

Zeit t in µs

SpannungU/U1inV/V

U2^U1^

1-|TF(f1)|

U1^|TF(f1)| =

f1/2 f

arc(TF(f1 = (f1

0 50 100

Zeit t in µs

SpannungU2/U1inV/V

Input signal

(sine wave of

variable frequency)

Output signal

PhaseMagnitude

Measurement Setup

Power Transformer (complex RLC network)

U1 Rref=50Ω U2Rme=50Ω

FRA Instrument

Output Reference

Channel

Measurement

Channel

Injection signal

Reference signal (Vin)

Measurement signal (Vout)

Passive Components

Low-Pass Filter

Fre uenc Hz

Amplitude[dB]

L=200 mH

L=2 mH

L=20 H

= 0 , = 0 , = , =

= 1 = 0

= ∞ , = ∞ , = 0 , =

High-Pass Filter

Rref Rm

Fre uenc Hz

Amplitude[dB]

C=20nF

= 0 , = ∞ , = 0 , =

= ∞ , = 0 , = = 1, =

= 1 = 0

Band-Pass Filter – Series Resonance

Rref Rm

Fre uenc Hz

Amplitude[dB]

C=10nF

C=50nF

= , = , ℎ !

Inductor and Capacitor create short-circuit!

Band-Stop Filter – Parallel Resonance

Rref Rm

Frequency (Hz)

Amplitude[dB]

C=10nF

C=50nF

Inductor and Capacitor create open circuit!

= , = , !

RLC Basics

• Parallel RLC - VALLEY

• Series RLC – PEAK

• 0 dB = 0 Ohms = Short

• -100 dB = = Open

FRA Trace Example

Low-Pass!

Band-Pass!

Band-Stop!

High-Pass!

All 4 four filter types appear in SFRA traces!

Typical Resultsf/Hz

5.000e+001 1.000e+002 5.000e+002 1.000e+003 5.000e+003 1.000e+004 5.000e+004 1.000e+005 5.000e+005 1.000e+006

N W sec N V sec N U

f/Hz5.000e+001 1.000e+002 5.000e+002 1.000e+003 5.000e+003 1.000e+004 5.000e+004 1.000e+005 5.000e+005 1.000e+006

Failure Mode Identified with SFRA

1. Radial “Hoop Buckling” Deformation of Winding2. Axial Winding Elongation “Telescoping”

3. Overall- Bulk & Localized Movement

4. Core Defects

5. Contact Resistance

6. Winding Turn-to-Turn Short Circuit

7. Open Circuited Winding

• Residual Magnetization

• Oil Status (With or Without)

• Grounding

Radial Failure

Axial Failure

Conductor Tilting

Core Failure Modes

• Over-Heating• Bulk Movement

• Multiple Core Grounding

• Lamination Gaps• Shorted Laminations

• Ungrounded Core

Measurement Types

1. Open Circuit - Exciting Ima

2. Short Circuit - Leakage Reactance

3. Interwinding – CHL CAP

4. Transfer Voltage – Turns Ratio

Measurement Setup – OPEN CIRCUIT

HV vs. LV Winding Responses

Open Circuit Tests

Measurement Setup – SHORT CIRCUIT

Short Circuit Test

> 12/08/2014

Open vs. Shorted tests

Short Circuit Tests

Measurement Setup

Inter-winding measurements: Capacitive (left) Inductive (right)

Capacitive Inter-Winding Test

> 12/08/2014

Inductive Inter-Winding Test

> 12/08/2014

Usable Frequency Ranges

Transformer Types

• 2 Winding (H, X) 3-H OC

3-X OC

3-HX SC

• 3 Winding (H, X, Y) 3-H OC

3-X OC

3-Y OC

3-HX SC

3-HY SC

• Auto Transformer (Series, Common, Tert)

3-H Series OC 3-X Common OC

3-Y Tert OC

3-HX SC

3-HY SC

Test Connections

Test Recommendations (IEEE)

• LTC Extreme Raise

• DETC as Found

• Open Circuit Test

• Short Circuit Test

Series Winding Open Circuit Test

H1-X1 (A) H2-X2 (B) H3-X3(C)

Common Winding Open Circuit Test

X1-X0 (A) X2-X0 (B) X3-X0 (C)

Short Circuit Test

H1-H0X0 (A) H2-H0X0 (B) H3-H0X0(C)

Overview of B Phase

H1-X2 (B) X2-X0 (B) H2-H0X0 (B)

Analysis Strategies

1. Baseline

2. Similar Unit

3. Phase Comparison

SFRA Interpretation

Fingerprint

Date X Date Y

T i m e

b a s e d c o m p a r i s

P h a s e

b a s e d c o m p a r i s

f/Hz1 . 0 00 e + 00 2 5 . 0 00 e + 00 2 1 . 0 0 0e + 0 03 5 . 0 0 0e + 0 03 1 . 0 00 e + 00 4 5 . 0 00 e + 00 4 1 . 0 0 0e + 0 05 5 . 0 00 e + 00 5 1 . 0 0 0e + 0 06

n u n v n

u v v u

U K nt t fli ß li rt v c n

f/H1. + . + 1. + . + 1. + . + 1. + . + 1. +

f/Hz1 . 00 0 e+ 0 02 5 . 00 0 e+ 0 02 1 . 00 0 e+ 0 03 5 . 00 0 e+ 0 03 1 . 00 0 e+ 0 04 5 . 00 0 e+ 0 04 1 . 00 0 e+ 0 05 5 . 00 0 e+ 0 05 1 . 00 0 e+ 0 06

n u n v n

u v v u

f/H1. . 1. . 1. . 1. . 1.

f/Hz1 . 0 00 e + 00 2 5 . 0 0 0e + 0 02 1 . 0 0 0e + 0 03 5 . 0 0 0e + 0 03 1 . 0 00 e + 00 4 5 . 0 00 e + 00 4 1 . 0 0 0e + 0 05 5 . 0 0 0e + 0 05 1 . 0 0 0e + 0 06

n u n v n

u v v u

f/H1. + . + 1. + . + 1. + . + 1. + . + 1. +

A B C A B C

f/Hz1 .0 0 0e + 0 02 5 .0 0 0e + 0 02 1.0 0 0 e+ 0 0 3 5 .0 00 e + 00 3 1 .0 0 0e + 0 04 5 .0 00 e + 00 4 1 .0 0 0e + 0 05 5 .0 0 0e + 0 05 1.0 0 0 e+ 0 0 6

f/1 .0 0 0e + 0 02 5 .0 0 0e + 0 02 1.0 0 0 e+ 0 0 3 5 .0 00 e + 00 3 1 .0 0 0e + 0 04 5 .0 00 e + 00 4 1 .0 0 0e + 0 05 5 .0 0 0e + 0 05 1.0 0 0 e+ 0 0 6

A vs B vs C

A B C A B C

f/Hz1 . 0 00 e + 00 2 5 . 0 00 e +0 0 2 1 . 0 00 e +0 0 3 5 . 0 00 e +0 0 3 1 . 0 00 e +0 0 4 5 . 0 00 e + 00 4 1 . 0 00 e + 00 5 5 . 0 00 e +0 0 5 1 . 0 00 e +0 0 6

n u n v n

u v v u

U K n t k t fl i ß l i rt v c n

f/H1. + 5. + 1. + 5. + 1. + 5. + 1. + 5 5. + 5 1. +

f/Hz1 . 0 00 e +0 0 2 5 . 0 00 e +0 0 2 1 . 0 00 e + 00 3 5 . 0 00 e +0 0 3 1 . 0 00 e +0 0 4 5 . 0 00 e + 00 4 1 . 0 00 e + 00 5 5 . 0 00 e +0 0 5 1 . 0 00 e + 00 6

n u n v n

u v v u

U K nt k t f li ß l i r t v c n

f/H1. + 5. + 1. + 5. + 1. + 5. + 1. + 5 5. + 5 1. +

Construction based comparison

Radial Deformation (IEEE)

IEEE WG PC57.149 (Guide) D8

Axial Deformation (IEEE)

Core Defects (IEEE)

CASE STUDY

1969 Transformer

CASE STUDY

Initial Problem

Phase 1: Trip out of Service, Differential

Phase 2: DGA

Initial Problem

Phase 1: Trip out of Service, Differential

Phase 2: DGA

Phase 3: Test

-Visual Inspection

-Power Factor

-Exciting Current

-Transformer Turns Ratio

-Second DGA – 19 PPM of Acetylne

Phase 4: Reviewed SFRA data

HV O Ci t

HV Open Circut

LV O Ci t

LV Open Circut

Failure Modes due to Radial Forces

IEEE PC57.149

Shift to the right

HV Short Circut

HV Short Circut Zoom In

HV Short Circut – Zoom In

~0.1db difference.. Not bad!

Phase 6: Perform Addition Test

-Leakage Reactance +FRSL

-Winding Resistance

Leakage Reactance 3 Phase Equivalent and Per Phase Test

Leakage Reactance – 3 Phase Equivalent and Per Phase Test

9.62% difference compared to average!

Leakage Reactance FRSL

Leakage Reactance – FRSL

Winding Resistance

Phase 5: Perform Addition Test

-Leakage Reactance +FRSL

-Winding Resistance

Phase 6: Tear down

During Tear Down, Transformer caught on fire

Tear Down

B Phase

Take a closer look

B phase Zoom In

From Left side of Buldge Right Side of Buldge

Thank You for Your Attention

Wilsonville SFRA.pdf

Documents

Transcript of Wilsonville SFRA.pdf

WEST LINN - WILSONVILLE SCHOOL DISTRICT

Prepared by: National Carbon Capture Center Wilsonville ... · National Carbon Capture Center Wilsonville, AL ... MEA Monoethanolamine NCCC National Carbon ... Testing of Hitachi

MULTIFAMILY PROPERTY FOR SALE Wilsonville Greens - 12 ... · ANITA RISBERG, CCIM Principal Broker anita@omnivestcire.com 503.847.7990 Wilsonville Greens - 12 Townhome Style Units

C&D & MRFs Willamette Resources, Inc. Wilsonville, OR Armando Arellano, LEED AP BD+C, O+M Willamette Resources, Inc. Wilsonville, OR Armando Arellano,

2013 OCTE Fall Conference October 5, 2013 ~ Wilsonville ......Volume 38, No. 2, Spring 2013 OCTE Fall Conference October 5, 2013 ~ Wilsonville The Western History Association “Autry

West Linn – Wilsonville Schools - wlwv.k12.or.us

About Metro Wilsonville

Wilsonville Elementar y School’s new sensor y room … a “cozy cove” where students can relax away from others. Wilsonville sensory room opens new world for special needs students

Sunset Primary School West Linn Wilsonville School ...

Distrito Escolar de West Linn-Wilsonville Lista de Cotejo ... · Distrito Escolar de West Linn-Wilsonville Lista de Cotejo de ... 2. Forma de Preferencia de ... ¿Se ha mudado durante

Welcome Class of 2015! Incoming 9 th Grade Parent Night Wilsonville High School April 7, 2011.

he Boones Ferry Messenger - ridesmart.com · Monthly newsletter of the City of Wilsonville April 2018 The Boones Ferry Messenger PRSRT STD U.S. Postage Paid Wilsonville, OR Permit

Wilsonville Chamber Five Great Marketingt Tips

Concentration Presentation - West Linn-Wilsonville School ...

Newton’s 2nd Law Note-sheet - West Linn-Wilsonville ...

Overview of New System Beta Team from Wilsonville 1425 Wilsonville Robotics – Code Xero 2550 Oregon City Robotics.

A WILSONVILLE CHRISTMAS - oregonlive

OSIA Wilsonville, Oregon January 25, 2013 John W. Mitchell.

Wilsonville, Oregon

Willamette Water Treatment Plant Wilsonville Oregon WQT 131 Field Trip