Biosco: MV/LV prefabricated
substations
IEC 62271-202
Presentation 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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> Introduction
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.
IEC
UL
IEC
IEC
IEC
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IEC
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> Introduction
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:





Biosco - Présentation clientèle - 08/2007
Transformer
LV switchboard
MV switchboard
MV and LV interconnections
Auxiliary equipment
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> Introduction
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 substations
Type-tested equipment
 All substation components must conform to IEC standards and in
particular:
Biosco - Présentation clientèle - 08/2007

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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> Type-tested substations
The prefabricated substation undergoes type tests
Use of equipment conform to
IEC standards
Functional tests
Electromagnetic
compatibility
Degree of
protection
Temperature
class
Insulation
level
Non
flammable
materials
Earthing
circuit test
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Mechanical resistance
of the enclosure
Sound level
MV
LV
Internal
arcing
withstand
Oil retention
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> Type-tested substations
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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Biosco W
Biosco N
Biosco H
Biosco U
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Contents
 Introduction
 Type-tested substations
 The type tests
 A specification tool
 Conclusion
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> The type tests
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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> The type tests
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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> The type tests
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



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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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> The type tests
Main circuit and earthing tests
 Aim of test:

To guarantee the capacity to withstand short-circuit currents
 Our performance

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The Biosco substations are tested up to 12 kA
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> The type tests
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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> The type tests
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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> The type tests
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


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Roof withstand greater than 250 daN/m²
IK10 (including doors and ventilation grids)
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> The type tests
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

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Pressure and temperature simulation
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> The type tests
Sound verification test
 Aim of test

To ensure that the substation enclosure does not increase the
transformer noise level.
 Our performance

Biosco - Présentation clientèle - 08/2007
The Biosco substations conform to the requirements of the IEC
standard
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> The type tests
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


Biosco - Présentation clientèle - 08/2007
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
A specification tool
 Standard IEC 62271-202 tells users which information should be
supplied for invitations to tender and orders.
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
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
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.
Use of equipment conform
to IEC standards
Electromagnetic
compatibility
Functional tests
Temperature
class
Non
LV
flammable
materials
Earthing
circuit test
Mechanical resistance
of the enclosure
Sound
level
Insulation
level
MV
Internal
arcing
withstand
Oil retention
 An MV/LV substation specification guide
providing all characteristics and installation
and operation conditions
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Thank you for your attention
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