nex 24

NEX 24

24 kV switchgear

May 2010

Schneider Electric 2- MV LoB- G. Allison / M. Maitre – May 2010

ApplicationsNEX offer Range descriptionRemote control Continuity of service

Agenda


Applications


●NEX 24 is present on all electrical distribution markets:● energy

● infrastructure: hospitals, airports

● industry: cement plants, water

A solution for MV primary substations


●NEX 24 for standard applications

Simplicity


● 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● …

Flexibility


NEX 24 offer


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


●Vacuum breaking technology●24 kV voltage level●Two cubicle widths for the range

Characteristics

800mm 1000mm

2300

mm


Performances

NEX 24

24 kV

A

kA

630 1250 2500

16

25

31,5

40

50

2000


Installation parameters

Protection index

IP3X - IP4X

A B C D

NEX 24 600 1 810 4000 600


Top bar connectionBottom cable connection Top cable connection

Installation and connection type


●Safety of use for all against electrical, mechanical and thermal effects of a fault:

●each compartment is insulated from the othersby metallic earthed walls

● 3 compartments :

●cable connection

●circuit-breaker

●busbar

● Low Voltage cabinet

NEX 24 complies with IEC 62271-200 standard


●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

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

Standards conformity


●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

An efficient and safe interface


NEX 24 25kA 1s (AFLR)

Modèle Performance

NEX 24 internal arc withstand performances


●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 busbarand cable compartments

● the MV parts are compartmentalised by earthed metallic partitions and shutters

Protection of operators and continuityof supply


●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

Ease of maintenance


Range description


A complete range

●A cubicle for each function

Feeder

IF cubicle

Incomer

IF cubicle

Coupling

BC and RF(RW)cubicles

Busbarearthing

BM cubicle

Load-break

LB cubicle

Feeder

IF cubicle


Remote control


●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

A built-in protection and monitoring chain


●To supply protection, metering and monitoring devices

●A full preferential current transformer range, harmonized with digital protection devices, to simplify determination of accuracy characteristics:

Instrument transformers

ARJP, ARJH, ARJM ARJAtype current transformer

TLP 160 / 190current transformer

VRS3 voltage transformer


●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

Voltage prescence indicator: an effective and safe interface


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

Permanent monitoring


Continuity of supply


Draw-out devices – circuit breaker


●Evolis circuit breaker● Evolis circuit breaker for cubicles IF and BC 24 kV / 2000 A

● RI operating mechanism

Vacuum breaking draw-out devices


The earthing and disconnector trucks

Earthing truck● is a safety feature which allow

the cubicles busbar to be earthed

Disconnector truck● enables the upper and lower part

of the cubicle to be short-circuited.


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


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)


●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

Eco-design and eco-produce


●NEX 24● Provides optimum continuity of supply

● Proximity, flexibility

● Facilitates and simplifies maintenance

Conclusion

nex 24

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