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

2. Contents Introduction Type-tested substations The type tests
A specification tool
Conclusion

3. Contents Introduction Type-tested substations The type tests
A specification tool
Conclusion

4. Standard IEC 62271-202: an international influence
> Introduction
Standard IEC : an international influence
Biosco conforms to IEC international standard
IEC standard applies to most of prefabricated substations world-wide. UL
IEC

5. > Introduction
Introduction
IEC 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

6. > 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

7. Contents Introduction Type-tested substations The type tests
A specification tool
Conclusion

8. Type-tested equipment
> Type-tested substations
Type-tested equipment
All substation components must conform to IEC standards and in particular:
Transformers: IEC or
MV switchboard: IEC or
LV switchboard: IEC and IEC

9. The prefabricated substation undergoes type tests
> Type-tested substations
> Type-tested substations
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
Earthing
circuit test
Oil retention

10. The 4 designs of the Biosco range conform to IEC 62271-202 standard
> Type-tested substations
The 4 designs of the Biosco range conform to IEC 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
Biosco U
Biosco N
Biosco H
Biosco W

11. Contents Introduction Type-tested substations The type tests
A specification tool
Conclusion

12. 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

13. Dielectric tests Aim of test
> 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 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

14. Temperature rise tests
> 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
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.
The substation is characterised by the enclosure class
This is the difference between temperature rise of the transformer in the enclosure and temperature rise of this same transformer outside the enclosure in normal conditions.
The different standardised classes are:
Class 5 ; class 10: class 15 ; class 20: class 25 ; class 30

15. Main circuit and earthing tests
> The type tests
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

16. Functional tests Aim of tests
> 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

17. Degree of protection verification test
> 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.

18. Mechanical tests Aim of test
> 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
Roof withstand greater than 250 daN/m²
IK10 (including doors and ventilation grids)

19. Arc due to an internal fault test
> 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
Pressure and temperature simulation
Film1: failed test (red camera); film 2: successful test ( blue camera);

20. Sound verification test
> The type tests
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

21. Electromagnetic compatibility test
> 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
HV and LV switchgear comply with the specifications of standards IEC and
Electromagnetic fields are simulated.

22. Contents Introduction Type-tested substations The type tests
A specification tool
Conclusion

23. > A specification tool
Standard IEC 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…

24. > A specification tool
The information required for specifications is summarised in table form. All the electrical utility has to do is complete this information.

25. Contents Introduction Type-tested substations The type tests
A specification tool
Conclusion

26. 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
Temperature class
Insulation level MV
Non flammable materials LV
Internal arcing withstand
Earthing
circuit test
Oil retention

27. Thank you for your attention