NEX 24
24 kV switchgear
May 2010
Agenda
Applications
NEX offer
Range description
Remote control
Continuity of service
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Applications
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A solution for MV primary substations
● NEX 24 is present on all electrical distribution markets:
● energy
● infrastructure: hospitals, airports
● industry: cement plants, water
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Simplicity
● NEX 24 for standard applications
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Flexibility
● NEX 24 closer to you
● Proximity:
●well-proven technical support
●quick response to request for quotes and tenders
●optimal solution with advanced characteristics
●dedicated engineering
● A complete range:
●Circuit breaker
●voltage transformers / current transformers
●earthing switch
●…
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NEX 24 offer
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Characteristics
● Definition:
● draw-out metal-enclosed switchgear functional units
● indoor installation
● air insulated cubicle (AIS)
● Electrical data:
● rated insulation voltage: 24 kV
● lightning surge withstand: 125 kV peak
● nominal current: 630 A to 2000 A
● main circuit short-time withstand current:
up to 25 kA 3s
● earthing switch short-time withstand current:
up to 25 kA 3s
● internal arc withstand: up to 25 kA 1s ALFR
Schneider Electric - MV LoB- G. Allison / M. Maitre – May 2010
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Characteristics
2300 mm
● Vacuum breaking technology
● 24 kV voltage level
● Two cubicle widths for the range
800mm
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1000mm
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Performances
kA
24 kV
50
40
31,5
25
NEX 24
16
A
630
1250
2000
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2500
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Installation parameters
NEX 24
A
600
B
1 810
C
4000
Schneider Electric - MV LoB- G. Allison / M. Maitre – May 2010
D
600

Protection index
o
IP3X - IP4X
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Installation and connection type
Bottom cable connection Top bar connection
Schneider Electric - MV LoB- G. Allison / M. Maitre – May 2010
Top cable connection
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NEX 24 complies with IEC 62271-200
standard
●Safety of use for all against electrical, mechanical and thermal effects
of a fault:
●each compartment is insulated from the others
by metallic earthed walls
● 3 compartments :
●cable connection
●circuit-breaker
●busbar
● Low Voltage cabinet
Schneider Electric - MV LoB- G. Allison / M. Maitre – May 2010
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Standards conformity
● NEX 24 range complies with international IEC 62271-200 standard
governing metal-enclosed switchgear for AC current for rated voltages
above 1kV and up to and including 52 kV
● Standards:
● IEC 60694 IEC62271-1 : Common clauses for HV switchgear
● IEC 62271-200 (60298): AC metal-enclosed switchgear and controlgear for rated voltages
above 1kV and up to and including 52 kV
● IEC 62271-100 (60056): HV AC circuit-breakers
● IEC 60470: HV AC contactors
● IEC 60265-1: HV switches
● IEC 60282-2: HV fuses
● IEC 62271-102 (60129): AC disconnector and earthing switch
● IEC 60255: Measurement relay and protection device
● IEC 60044-1: Current transformers
● IEC 60044-2: Voltage transformers
● IEC 60044-8: Electronic current transformers
● IEC 60529 : Degrees of protection provided by enclosures
● IEC 61958: Voltage Presence Indication Systems
Schneider Electric - MV LoB- G. Allison / M. Maitre – May 2010
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Standards conformity
● Normal operating conditions:
● Indoor equipment
● temperature -5 to +40°C
● altitude
 1000 m
● humidity
 95 % over 24 h
 90 % over 1 month
● Specific conditions:
● Possibility to adapt equipment
according to environmental requirements
Schneider Electric - MV LoB- G. Allison / M. Maitre – May 2010
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An efficient and safe interface
● All operations are carried out with the door closed
● Access to live parts is impossible due to protective flaps
● Voltage presence indicator
● Position indicator linked to device physical position
● Instructions in symbol form:
● without text
● Standardized symbols
● Locking systems:
● by padlock
● by key-lock
● electromagnetic
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NEX 24 internal arc withstand
performances
Modèle
Performance
NEX 24
25kA 1s (AFLR)
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Protection of operators and continuity
of supply
● Architecture based on safe access to compartments:
● protection of operators in the event of internal arcing
● complies with 5 criteria:
●les correctly secure doors and covers do not open
●no fragmentation of the enclosure occurs within the time specified for the test
●arcing does not cause holes in the accessible sides up to a height of 2m
●indicators do not ignite due to the effect of the hot gases
●the enclosure remains connected to its earthing point
● Satisfies continuity of supply requirements:
● maintenance with power on (LSC2B)
●secured access to compartments with power on thanks to separate busbar
and cable compartments
● the MV parts are compartmentalised by earthed metallic partitions
and shutters
Schneider Electric - MV LoB- G. Allison / M. Maitre – May 2010
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Ease of maintenance
● Preventive and reduced maintenance
● Sepam protection unit:
●sum of currents broken
●event memorisation
●control circuit monitoring
●self-monitoring
● Simplicity of maintenance
● Periodic simple operation checking
● Cleaning and lubrication every 5 to10 years
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Range description
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A complete range
● A cubicle for each function
Feeder
Incomer
IF cubicle
IF cubicle
Coupling
BC and RF(RW)
cubicles
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Busbar
earthing
Load-break
Feeder
BM
cubicle
LB cubicle
IF cubicle
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Remote control
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A built-in protection and monitoring chain
● Sepam multi-function protection relay range:
● series 20 Sepam for standard applications:
– Current or voltage measurement
● series 40 Sepam for advanced applications
– All measurements: current and voltage, power, energy
● series 80 Sepam for specific and customized applications
– All measurements: current and voltage, power, energy
● Sepam, a solution adapted to your operations:
● Real time data comprising circuit-breaker status
● Quick isolation of a failed network component
and network configuration from the remote control centre
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Instrument transformers
● To supply protection, metering and monitoring devices
● A full preferential current transformer range, harmonized with digital
protection devices, to simplify determination of accuracy characteristics:
TLP 160 / 190
current transformer
ARJP, ARJH, ARJM ARJA
type current transformer
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VRS3 voltage transformer
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Voltage prescence indicator:
an effective and safe interface
● The VPIS (Voltage Presence Indicator System) is located
on the front panel of the functional unit and in the immediate proximity
of the earthing switch operating mechanism
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Permanent monitoring
NEX 24 Transparent Ready option:
● Access to predefined Web pages containing information on:
●Current, power, energy, history, …
● Uses a simple Web server and the local TCP / IP network
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Continuity of supply
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Draw-out devices – circuit breaker
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Vacuum breaking draw-out devices
● Evolis circuit breaker
● Evolis circuit breaker for cubicles IF and BC 24 kV / 2000 A
● RI operating mechanism
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The earthing and disconnector trucks
Earthing truck
● is a safety feature which allow
the cubicles busbar to be earthed
Schneider Electric - MV LoB- G. Allison / M. Maitre – May 2010
Disconnector truck
● enables the upper and lower part
of the cubicle to be short-circuited.
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A guaranteed high level of availability
● The result of experience of more than 2000 items of switchgear
installed world-wide
● Incorporation of innovating solutions designed from tried
and tested equipment:
● High performances breaking devices
● Digital control, monitoring and protection chains
● Enclosures able to withstand internal arcing
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References the world over in all sectors
of activity
● Infrastructures
● Hotel Méridien Bangalore (India)
● New Airport of Bangkok (Thailande)
● Sous-Station du port de Lattakia (Syria)
● Energy
●
●
●
●
North Delhi Power Ltd (India)
Otway, Port campbell offshore extraction de gaz (Australie)
Raffinerie de pétrole Empresa (Colombie)
Technip Qatargas (Qatar)
● Industry
● Usine Hyflux de désalination d’eau (Singapour)
● Station de Pompage d’eau Bir Hal Hacham (Syrie)
● Mines d’or du nord de Mara (Tanzanie)
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Eco-design and eco-produce
● Eliminate sensitive substances
● Facilitate treatment of products at end of life
● Continuously enhance the environmental performance of production
sites
97%
of Schneider Electric
industrial sites are ISO 14001
93%
of global products are eco-designed
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Conclusion
● NEX 24
● Provides optimum continuity of supply
● Proximity, flexibility
● Facilitates and simplifies maintenance
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