introducing micafil bushings · iec 60137 - 2017 ieee c57.19.00- 2004 and c57.19.01- 2000 standards...

—MICAFIL BUSHINGS, AUGUST 2018, LORENZO MARTINEL, HEAD OF SERVICE

Introducing MICAFIL BushingsMICAFIL High Voltage Dry BushingsIncrease safety and reliability by specifying your transformer bushings

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Failure statistic of power transformer

Fig. 1 University of Stuttgard … http://www.mdpi.com/1996-1073/9/5/347/htm

Increase safety and reliability by specifying your transformer bushings

September 4, 2018 Slide 2

Statistics

—Specification of bushings


IEC 60137 - 2017 IEEE C57.19.00- 2004 and C57.19.01- 2000

Standards do not recommend any technologies

Most common standards for bushing transformers include test procedures, certain limits and properties

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The utility/OEM should define the technology i.e. RIP / RIS / OIP

Specification of bushings


RIP (Resin Impregnated Paper) RIS (Resin Impregnated Synthetic) OIP (Oil Impregnated Paper)

The most common Standard i.e. IEC 60137 as well as IEEE C57.19.00 and C57.19.01 do not recommend orspecify any kind of technology of which the bushings should be made of. But CIGRE does.

—Increase safety and reliability by specifying your transformer bushings


Official papers published by CIGRE

The risk of fires being initiated by a failure of a RIP (Resin Impregnated Paper) or a RIS (Resin Impregnated Synthetic) bushing issignificantly less than … (page 3, §3.2)

—Increase safety and reliability by specifying your transformer bushings


Official papers published by CIGRE

Using RIP high voltage bushings is most cost effective method of reducing the risk of transformer fire…. (page 82, §6.8.1)



Benefits of capacity – controlled electric field:

– homogeneous electric field in the insulation material

– lower maximum electrical stress on the insulation

– longer operational safety

– Standard available IEC 60137 and IEEE C57.19.00 and …01

– Measuring Tap / Voltage Tap on each bushing

Type of electrical field distribution

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Due to safety aspects we recommend to specify composite insulation ….



Composite insulation HTV Composite insulation LSR Porcelain brown or gray

Airside insulation types

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… which passed the relevant Type Tests for all voltage levels.



Composite insulation HTV (RIP) Composite insulation LSR (RIP/RIS) Porcelain brown or gray

Airside insulation types

To ensure highest quality of the compositematerial, following type tests should bespecified:

IEC 61462

- Tracking and erosion- flammability test- water diffusion test- …

Optional

IEC 61109 : 5000h multi stress test

KIPTS Koeberg pollution test or similar

To ensure highest quality of the compositematerial, following type tests should bespecified:

IEC 61462

- Tracking and erosion- flammability test- water diffusion test- …

Optional

IEC 61109 : 5000h multi stress test

KIPTS Koeberg pollution test or similar

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RIP, Composite molded on fiberglass tube / RIS, composite is direct molded on condenser core



HTV on fiberglass tube LSR on fiberglass tube or direct mold Porcelain brown or gray

Airside insulation types and construction



Routine test limits according: ABB Micafil bushings routine test limits

IEC 60137 – 2017 // IEEE C57.19.01 - 2000

- Dissipation factor (tand), Power Factor < 0.40%

- Partial Discharge < 2 pC at 2x Um/√3

Example: RTXF 420-1675/1000 KSI

- 2 x 420kV/√3 = 485kV

- Partial Discharge acceptable at 485kV < 2pC

IEC 60137 – 2017 // IEEE C57.19.01 - 2000

- Dissipation factor (tand), Power Factor < 0.7%

- Partial Discharge < 10 pC at Um

Example: RTXF 420-1675/1000 KSI

- Partial Discharge acceptable at 420kV < 10pC

Ensures a long lifetime for bushings and your equipment

Routine Test: limits of dissipation factor (tand) as well as partial discharge



Voids causing partial discharge between al. layers Increase of capacitance due to short circuit of al layers

Typical sign of short circuit of aluminum layers is an increase of capacitance

Partial Discharge causes acceleration of aging



The standard IEC 60137 refers to IEC 60815-2 and -3:

– Site severity determination (pollution on site)

• Light 16 mm/kV

• Medium 20 mm/kV

• Heavy 25 mm/kV

• Very heavy 31 mm/kV

MICAFIL bushings standard is 31mm/kV related to Um

MICAFIL bushings standard is 31mm/kV

Pollution level affects creepage distance and arcing distance



Seismic specification according IEEE 693(moderate level, high level)

Shake table test to all bushings > 160kV

Calculation valid to all bushings < 160kV

Seismic specification according IEC TS 61463

Calculation valid for all bushings accelerationhas to be defined [m/s2]

Simulation on request

Simulation and report on request

Seismic requirements



On which altitude will the transformer be installed:

All standard bushings are designed for an installation altitude of1000m / 3300ft.According IEC 60137 §5.2 as well as IEEE C57.19.00-2004 §4.2.1

Indicate the altitude in your specification, if you exceed 1000m or3300ft.

Installation altitude

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Depending on the preference of the utility /OEM



Cable bolt for draw lead Removable solid rod conductor Fix conductor (non removable)

Type of conductors

Lower current range Medium currents current range High current range



RIP bushings RIS bushings

– RIP bushings are very sensitive to humidity

– Paper absorbs humidity which has an impact to the quality ofthe condenser core (increase of tand)

– Precautions have to be taken

Specify the way of storage especially for spare bushings

Storage of bushings

- Less sensitive since Synthetic mash has been used

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Specify the way of storage especially for spare bushings



Standard packing for < 6 months Long-term storage up to 2 years Long-term storage up to 2 years

Storage of bushings



Specification for new transformer bushings Specification for replacement bushings

• Fleet Management will help to reduce cost and increaseavailability.

• Details were shown in this presentation

Take the opportunity for cost savings and increasing availability.

Taking Fleet Management into consideration



Current transformer (CT) adjustments Specification for replacement bushings

• Fleet Management will help to reduce cost and increaseavailability.

• Adjustments with adapter flanges for CT adjustments

Take the opportunity for cost savings and increasing availability.

Taking Fleet Management into consideration



Expected lifetime of the MICAFIL bushings as well as reference lists

—Your Contact Partners – Customer Service


MICAFIL Service Team 24 / 7

Your Service Team

We are pleased to inform you, that our Service Team will be available for you 24h a day and 7 days a week.

Please call +41 58 586 0770It will be a pleasure to support you for all technical requests or questions you have.

Lorenzo MartinelTeamleader [email protected]

Karl HechtService [email protected]

Zekeriya TanSenior Service [email protected]

Mario KoppService [email protected]

Gianluca BoccarelloService [email protected]

—ABB Switzerland Ltd. MICAFIL Bushings


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introducing micafil bushings · iec 60137 - 2017 ieee c57.19.00- 2004 and c57.19.01- 2000 standards...

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