Biosco: MV/LV prefabricated substations IEC 62271-202 Presentation of the standard

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Biosco MV/LV prefabricated substations IEC
62271-202Presentation of the standard
Safety is a choice
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Contents

• Introduction
• Type-tested substations
• The type tests
• A specification tool
• Conclusion

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Contents

• Introduction
• Type-tested substations
• The type tests
• A specification tool
• Conclusion

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Standard IEC 62271-202 an international influence

• Biosco conforms to IEC 62271-202 international
  standard
• IEC 62271-202 standard applies to most of
  prefabricated substations world-wide.

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Introduction

• IEC 62271-202 standard specifies the rated
  characteristics, the design and construction
  rules and the test methods applicable to
  prefabricated substations.
• A prefabricated substation is defined as a
  type-tested assembly comprising an enclosure that
  includes
• Transformer
• LV switchboard
• MV switchboard
• MV and LV interconnections
• Auxiliary equipment

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Introduction

• These substations are located in places
  accessible to the general public. Consequently,
  safety of persons must be guaranteed
• Conformity to the IEC standard guarantees
• Protection of the general public
• Protection of operators

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Contents

• Introduction
• Type-tested substations
• The type tests
• A specification tool
• Conclusion

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Type-tested equipment

• All substation components must conform to IEC
  standards and in particular
• Transformers IEC 60076-1 or 60076-11
• MV switchboard IEC 62271-200 or 62271-201
• LV switchboard IEC 60439-1 and IEC 60947-1

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The prefabricated substation undergoes type tests
Use of equipment conform to IEC standards
Mechanical resistance of the enclosure


Functional tests

Sound level Degree of protection Insulation
level Internal arcing withstand
Electromagnetic compatibility
Temperature class
MV
Non flammable materials
LV

Oil retention
Earthing circuit test
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The 4 designs of the Biosco range conform to IEC
62271-202 standard

• Biosco W Substation with corridor
• Operation protected from bad weather conditions
• Biosco N Substation with external operation
• Ground space savings
• Biosco H Half-buried substation
• Visual impact limited
• Biosco U Underground substation
• Blends completely
• into the environment

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Contents

• Introduction
• Type-tested substations
• The type tests
• A specification tool
• Conclusion

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The type tests
1. Dielectric tests 2. Temperature rise tests 3.
Main circuit and earthing tests 4. Functional
tests 5. Degree of protection verification
tests 6. Mechanical tests 7. Arcing due to an
internal fault tests 8. Sound verification
tests 9. Electromagnetic compatibility tests
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Dielectric tests

• Aim of test
• To guarantee insulation of HV and LV
  interconnections
• Our performance
• The HV and LV interconnections of the Biosco
  range are tested as per standards IEC 60694 and
  60439
• Example for 24 kV switchgear
• Withstand to voltage of 50 kV at power frequency
  for 1 min
• Withstand to lightning impact voltage tests for a
  1.2 µs wave and a voltage of 125 kV

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Temperature rise tests

• Aim of test
• To determine the enclosure class
• To guarantee that none of the substation
  components will overshoot its standard-defined
  limits
• To guarantee temperature on the parts of the
  enclosure likely to be touched during operation
• To guarantee lifetime of insulating devices and
  thus safety of equipment during the period of
  operation
• Our performance
• The Biosco substation enclosures are class 10 as
  standard
• This performance can be adapted to your needs
  according to ambient temperatures, degrees of
  protection or transformer losses
• Numerical modelling and thermal simulations are
  performed.

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Main circuit and earthing tests

• Aim of test
• To guarantee the capacity to withstand
  short-circuit currents
• Our performance
• The Biosco substations are tested up to 12 kA

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Functional tests

• Aim of tests
• To guarantee that it is possible to carry out all
  the operations required for commissioning,
  operation and maintenance
• Our performance
• The Biosco substations undergo a series of
  verifications
• Switchgear operation
• Mechanical operation of substation doors
• Reading transformer temperatures and oil levels
• Monitoring voltage readings
• Installation of earthing devices
• Cable tests
• Replacement of fuses and monitoring of locking
  systems
• Operating the transformer on-load tap changer
• Cleaning the ventilation grids
• Monitoring the locking systems

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Degree of protection verification test

• Aim of test
• To ensure the protection of people against access
  to hazardous parts
• To guarantee the protection of equipment against
  ingress of foreign solid objects and water.
• Our performance
• The degree of protection of the Biosco
  substations is between IP23 and IP54
• This performance can be adapted to your needs
  stipulations of standards and climatic
  requirements.

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Mechanical tests

• Aim of test
• To guarantee withstand of roof in event of
  overload people, snow, etc.
• To guarantee the resistance of substation to wind
  pressure and to mechanical impacts on walls,
  covers, doors, ventilation opening.
• Our performance
• Roof withstand greater than 250 daN/m²
• IK10 (including doors and ventilation grids)

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Arc due to an internal fault test

• Aim of test
• To guarantee the protection of operators and the
  general public. The standard defines a
  classification
• Class A operator protection
• Class B general public protection
• Class AB operator and general public protection
• Our performance
• Koolarc system (cools and reduces pressure of arc
  gases)
• Classification for all substation types
• Example Biosco N India IAC-AB-20kA-1s
• Pressure and temperature simulation

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Sound verification test

• Aim of test
• To ensure that the substation enclosure does not
  increase the transformer noise level.
• Our performance
• The Biosco substations conform to the
  requirements of the IEC standard

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Electromagnetic compatibility test

• Aim of test
• To satisfy emission requirements laid down by
  international standards
• To guarantee the proper operation of equipment in
  an environment comprising large electromagnetic
  disturbance sources
• Our performance
• HV and LV switchgear comply with the
  specifications of standards IEC 60694 and
  60439-1.
• Electromagnetic fields are simulated.

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Contents

• Introduction
• Type-tested substations
• The type tests
• A specification tool
• Conclusion

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A specification tool

• Standard IEC 62271-202 tells users which
  information should be supplied for invitations to
  tender and orders.
• Network specificities
• Nominal and highest voltages
• Frequencies
• Neutral earthing mode
• Operating conditions
• Minimum and maximum temperatures
• Altitudes
• The specificities and electrical characteristics
  of prefabricated substations
• Voltage, power, frequency

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A specification tool

• The information required for specifications is
  summarised in table form. All the electrical
  utility has to do is complete this information.

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Contents

• Introduction
• Type-tested substations
• The type tests
• A specification tool
• Conclusion

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Conclusion

• Type-tested MV, LV equipment and transformer
• A series of type tests to guarantee safety and
  reliability of the prefabricated substation
  throughout its life cycle.
• An MV/LV substation specification guide providing
  all characteristics and installation and
  operation conditions

Use of equipment conform to IEC standards
Mechanical resistance of the enclosure
Electromagnetic compatibility
Sound level
Functional tests
Insulation level
Temperature class
MV
Internal arcing withstand
Non flammable materials
LV
Oil retention
Earthing circuit test
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Thank you for your attention