11 HSP Bushings

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TRANSFORM Partner Dr. Bernhard Heil HSP Hochspannungsgeräte GmbH & Trench Bushing Group Design, production and evaluation of the reliability of bushings

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all about bushing

Transcript of 11 HSP Bushings

Page 1: 11 HSP Bushings

TRANSFORM Partner

Dr. Bernhard Heil

HSP Hochspannungsgeräte GmbH & Trench Bushing Group

Design, production and evaluation of the reliability of bushings

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07.06.2013 Dr. Bernhard Heil, HSP Hochspannungsgeräte GmbH & Trench Bushing Group Page 2

Biography

Engineering Diploma from the RWTH Aachen University, Germany in 2001

PhD from the same University in 2006

From 2006 to 2008 Chief Engineer of the Insulating Systems and Diagnostics

Research Group at RWTH Aachen University

Employed with HSP Hochspannungsgeräte GmbH in Cologne, Germany since

2008

Department Head of the Technical Support

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Agenda

Function of Bushings in the High Electric Field

Description of graded Condenser Bushings

Condenser graded insulating Body (Core)

RBP – Resin Bonded Paper – Properties

OIP – Oil Impregnated Paper – Properties

RIP – Resin Impregnated Paper – Properties

Housings for bushings – Composite Insulators

Transformer Bushings: RIP vs. OIP

Aging of Bushings

Examples

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Function of Bushings in the High Electric Field

07.06.2013 Dr. Bernhard Heil, HSP Hochspannungsgeräte GmbH & Trench Bushing Group Page 4

Paper

Capacitive grading by conductive layers Equipotential lines

The basic function of a bushing is the save insulation of a conductor by

suitable influencing of the dielectric

Control of electrical field strength inside and outside of the bushing.

The dielectric strength must be ensured for the whole lifetime.

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07.06.2013 Dr. Bernhard Heil, HSP Hochspannungsgeräte GmbH & Trench Bushing Group Page 5

Description of graded Condenser Bushings

Core insulator

- OIP oil impregnated paper

- RBP resin bonded paper

- RIP resin impregnated paper

Secondary insulation

- Oil (main insulation for OIP)

- Gas

- Dry material filler

Transformer end housing

- Porcelain

- Epoxy-Resin

- RIP (no housing needed)

Outdoor end housing

- Porcelain

- Composite insulator

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Condenser graded insulating Body (Core)

The technology of resin and of oil

impregnated paper bushings at HSP

is established since more than 50 years

RBP-production was

shut down at HSP in 1974.

Some manufacturers do still

hold on for this technology.

START 1913

RBP

SINCE 1960

RIP OIP

SINCE 1950

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RBP – Resin Bonded Paper – Properties

Insulating paper, impregnated with phenolic or epoxy

resin.

Wound under temperature and pressure.

During this process the polymerisation of the resin is

carried out.

Typical laminate material.

Partial discharges with high intensity in several gaps at

normal operating voltage during the whole lifetime.

RBP

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RBP – Resin Bonded Paper – Properties

RBP

Measurement of capacitance and loss factor

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

1,8

2

2,2

2,4

0 20 40 60 80 100

Temperature [°C]

Lo

ss f

acto

r [%

]

thermal

instability

- Slight temperature dependant loss factor

- Strong increase of the loss factor during lifetime

aging

10 years

15 years

20 years

25 years

30 years max. value

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OIP – Oil Impregnated Paper – Properties

Insulating paper, e.g. cable paper, dried under temperature

and vacuum and impregnated with insulating oil.

Advantages:

- No partial discharge during whole lifetime.

- Good ageing experiences.

- Lower production costs (compared with RIP)

Disadvantages:

- Needs complete housing.

- Core may drop into the transformer if housing is

damaged.

- Inflammable

- max. temperature 105°C

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07.06.2013 Dr. Bernhard Heil, HSP Hochspannungsgeräte GmbH & Trench Bushing Group Page 10

OIP – Oil Impregnated Paper – Properties

Measurement of capacitance and loss factor

Dissolved gas analysis (DGA), Limits according to IEC 61464:

- Hydrogen (H2) 140 ppm

- Methane (CH4) 40 ppm

- Ethylene (C2H4) 30 ppm

- Ethane (C2H6) 70 ppm

- Acetylene (C2H2) 2 ppm

- Carbon monoxide (CO) 1000 ppm

- Carbon dioxide (CO2) 3400 ppm

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RIP – Resin Impregnated Paper – Properties

Creped insulating paper, dried under temperature and

vacuum, impregnated under vacuum with epoxy resin.

Advantages:

- No partial discharge during whole lifetime.

- Excellent ageing experience.

- No housing for oil end necessary.

- Secondary insulation: Dry material filler

- operates with damaged housing temporarily

- non-inflammable

- max. temperature 120°C

Disadvantages:

- higher production costs

RIP

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RIP – Resin Impregnated Paper – Properties

RIP

Measurement of capacitance and loss factor

- Capacitance and loss factor are temperature-dependent

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RIP – Resin Impregnated Paper – Manufacturing

Impregnation Turning shop

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Housings for bushings - Composite Insulators

In 1980 HSP started to replace porcelain housings with composite insulators.

Design and features of a composite insulator:

- Epoxy resin tube supported with fiber glass as mechanical reinforcement

- On each end of the tube there is a flange made of cast aluminum alloy.

- High hydrophobicity over the whole life time -> Perfect pollution performance

- Surface is Water repellant & self cleaning…even through thick layers of contamination

0

20

40

60

80

100

120

140

160

180

1996 1997 1998 1999 2000 2001 2002 2003

neue Durchführung

new bushing

alte Durchführung

old bushing

Ableitstrommessung / leakage current

I / µA

Long-term measurement of the leakage current

at 2 RIP-123kV bushings running since 1977 in

bad environment.

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Transformer Bushings

Resin impregnated paper (RIP)

bushing with composite insulator

Oil impregnated paper (OIP)

bushing with porcelain insulator

glass fiber reinforced

epoxy resin tube with

silicon sheds

porcelain Insulator

RIP OIP condensor core

SF6 or foam oil secondary

insulation

not necessary epoxi resin oil part end

Option: silicone coated porcelain

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Aging of Bushings

Electrical stress: Overvoltage, VFT

Thermal stress: accelerated aging (ΔT = 6 K bisection of life time)

Mechanical stress

Treeing RBP-bushing Partial breakdown OIP-bushing Partial breakdown RIP-bushing

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3 Gorges, China; RIP ±500kV HVDC

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ITAIPU, Brazil-Paraguay; RIP 525kV EKTG-Bushing

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Yun-Guang, China; RIP ±800 kV UHVDC

Weight: 4 to

Length: 13500 mm

This is the first bushing worldwide for ±800 kV

UHVDC transmission in RIP dry technology.

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Summary

Function of a bushings

Types of condenser cores: RBP – OIP – RIP

Evaluation of the reliability

Manufacturing of RIP

Types of bushings

Aging of Bushings

Examples

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HSP Hochspannungsgeräte GmbH & Trench Bushing Group

Our Production Locations Americas Europe Asia

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