"nordic" product range (gb)

«NORDIC» Product Range

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Here is our comprehensive product range dedicated to “MV distribution” and “earthfault compensation”.

Self-protected “TPC transformers” (with and

without built-in inductance) are commonly used

to revamp existing substations. The use of such

transformers into conventional enclosures is now

recognized by Swedish EBR recommendation

KJ59:08.

The “ECOBLOC” prefabricated substation

features all the options needed for a perfect

integration into existing or newly created MV

underground networks in rural areas.

Earth fault compensation issues are covered

both by our transformers and substations when

installed on the feeder (“local compensation”),

or into the HV/MV source substation (“Global

compensation” by Arc Suppressing Coils with

electronic controller).

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C o n t e n t s

TPC “SELF-PROTECTED” TRANSFORMER

p.4

EQUIPMENT FOR“LOCAL” COMPENSATION

p.6

ECOBLOC PREFABRICATED SUBSTATION

p.8

“AsC” : ARC SUPPRESSING COIL WITH AUTOMATIC CONTROLLER

p.10

The advantages of a built-in fused 3 phases tripping function will gain more and more importance with the generalization of the compensated MV neutral grounding: indeed, many transformer faults are not energetic enough to guarantee the efficiency of conventional external fuses. Moreover, the handling and maintenance of these external fuses is problematic, and acceding to them with all required safety may be difficult to achieve.

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TPC “SELF-PROTECTED” TRANSFORMER

Thanks to the“maintenance free” TPC and a pre-established selectivity scheme, interventions from the operators can be limited to the “ordinary ones” on the LV side only. The three-phases

tripping in the event of a transformer fault is designed for preceding the tripping of the whole feeder, hence restricting the loss of supply. TPC has also found interesting cost-saving complementarities with “SF6 free” MV switchboards, facilitating their use into rural areas.

“TPC” offers both reliability and safety thanks to its conformity to the IEC 60076-13 “self-protected transformers” international standard, where performance levels and tests are clearly defined.

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Rated Power P0 (W) Pk (W)Dimensions

Oil Weight (kg)

Total Weight (kg)Length

L (mm)Width

W (mm)Height H (mm)

50 kVA 90 1100 810 660 1100 110 420

100 kVA 145 1750 820 700 1160 160 620

200 kVA 250 2750 920 780 1220 200 890

315 kVA 360 3900 1000 910 1300 260 1150

I t >

n a b c

SCHEMA 0: « TPC TRANSFORMER »

A B C

TPC

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Coupling: Dyn11 (Yyn0)

Primary voltage: 11 kV +-2x2,5%, or 22 kV +-2x2,5%

Secondary voltage: 420 V (240 V)(On request: 11 kV+ 4x2,5% - 2x2,5% 400V)

Electrical and dimensional characteristics

MV connections:250 A plug-in bushings according IEC 60137alternative: Porcelain bushings

LV connections:Porcelain bushings for 50 kVA and 100 kVA (with protection socket),Busbars for 250 kVA and 315 kVA (with protection socket)

50, 100 kVA TPC 200, 315 kVA TPC

Single line diagram

Typical CAHORS TPC

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The specific challenges faced by the distributors in Northern Europe are mainly entailed by very long MV underground feeders. “Local compensation” allows keeping the size of the Arc Suppressing coil located inside the HV/LV substation within reasonable limits. When cable length is such that the capacitive current even in the absence of a fault may create damages, permanent compensation can be achieved by a shunt reactor.

TPC has here an additional important part to play by making possible the localization of a faulty inductance by tripping the LV supply. Actually, an “un-revealed” faulty inductance would generate harmful and safety- hazardous high residual current in the event of a fault to earth.

TOTEM: TPC transformerswith built-in inductance (“local compensation”)

EQUIPMENT FOR “LOCAL” COMPENSATION

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Rated Power Rated Voltages P0 (W) Pk (W)

Currentlimitations

lx = inductivela = active

DimensionsOil Weight

(kg)

Total Weight

(kg)Length L (mm)

Width W (mm)

Height H (mm)

100 kVA 11 kV + 2x2,5% 420 V 215 1800 lx = 10 A, 300 sla = <2,5% * lx 910 780 1395 220 1000




LV

I t >

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T.P.C

INDUCTANCE

TRANSFORMER

Stabilisationwinding

SCHEMA 3: « TOTEM »

100 kVA « TOTEM » 200 kVA « TOTEM »


Typical CAHORS Totem

Single line diagram

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MV / LV ECOBLOC

L1, L2, L3n

SCHEMA 12: « ECOBLOC SSM SUBSTATION + INDUCTANCE »

1U , 1V, 1W

LV COMPARTMENT MV COMPARTMENT

I t >

1U , 1V, 1W

TPC TRANSFORMER

INDUCTANCE

SCHEMA 6: « ECOBLOC SSM SUBSTATION »

L1, L2, L3n

I t >

1U , 1V, 1W 1U , 1V, 1W

TPCTRANSFORMER

LV COMPARTMENT MV COMPARTMENT

SCHEMA 07: «

1 kV ECOBLOC SSM SUBSTATION »

L1, L2, L3n

I t >

1U , 1V, 1W 1U , 1V, 1W

TPCTRANSFORMER

« 1 kV » COMPARTMENT MV COMPARTMENT

I0 >

950 V

420 V

(option)

«Standard» MV / LV

«1 kV»

With Inductance(«Local compensation»)

According to international standard IEC 62 271-202

Coupling: Dyn11 (Yyn0)Primary voltage: 11 kV +-2x2,5%, or 22 kV +-2x2,5%On request: 11 kV + 4x2,5% - 2x2,5% 400 V

Secondary voltage: 420 V (240 V) Alternatively: 11 kV (or 22 kV) / 950 V (+ 420 V on request)Built-in protection: by TRANSFIX TPC

ECOBLOC PREFABRICATED SUBSTATION


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Rated Power P0 (W) Pk (W)Dimensions

Total Weight (kg)Length

L (mm)Width

W (mm)Height H (mm)

50 kVA 90 1100 1700 1110 1640 1090

100 kVA 145 1750 1700 1110 1640 1050

160 kVA 210 2350 1700 1110 1640 1410

200 kVA 250 2750 2000 1210 1640 1490

315 kVA 360 3900 2000 1210 1640 1700

500 kVA 510 5500 2000 1340 1640 2700

MV connections:“ELASTIMOLD” type isolated MV Bushings:Standard: 250 A Plug with plug-in contact (interface “A” according EN 50180)Alternative: 400 A / 600A with bolted contact (interface “C” according EN 50180)

Accessories part of the supply:Concrete Slab, MV voltage indicator inside the LV compartment, 2 x removable earthing plates, SDC-LES Lock,cover for temporary supply, SLD2 main LV switchThe substation is designed to allow simple further mounting of a cable fault detector (directional type).

Available colours:RAL 9005 Roof (Black) + RAL 7009 Enclosure (Green)RAL 9005 Roof (Black) + RAL 3009 Enclosure (Red)“Mixed Green” RAL 7032 + RAL 7033

Options:Metering arrangementsCable-fault Directional fault detectors

MV / LV ECOBLOC+ Inductance for “Local Compensation”Complementary applicable standard: IEC 60076-6 “Reactors”

Rated Power Rated Voltages P0 (W) Pk (W)

Currentlimitations

lx = inductivela = active

Dimensions Total Weight

(kg)Length L (mm)

Width W (mm)

Height H (mm)

100 kVA 11 kV + 2x2,5% 420 V 215 1800 lx = 10 A, 300 sla = <2,5% * lx 1700 1100 1640 1650






Coupling: ZN(d)yn11 (with stabilization winding)

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“AsC”: ARC SUPPRESSING COILwith AUTOMATIC CONTROLLER

The main advantages related to this new concept are the following:• Gathering into the oil bath of one “touch proof” package machine only, of the “usually” separated 4 equipments : Neutral builder, auxiliary transformer, resistor, adjustable inductance• As a result, the residual active current component of the WHOLE system is perfectly put under control, allowing perfect accuracy and demonstrable respect of the safety regulations• Cost saving for the installation work, making unnecessary protective fences, or a sectionnalizer which would be dedicated to a separate resistor• The connection of the “package machine” to the three phases of the network (thanks to the built-in inductance) allows to keep the AsC in operation even when a transformer is out of duty• The measurement means also included into the “package machine” (VTs and CT), can be used to secure the supply of the feeder protections themselves.• The efficiency of the tuning is optimum even for «highly balanced networks» thanks to a built-in «switchable» capacitor placed between one phase and the earth. The «zero-sequence» voltage curve can thus be amplified to determine accurately the resonant point.

V1U-1N

V1N-G

=Vr / 3

Ir

V2 N’2U’240Vac

1

2

1

2

1N

1

2

X3 X2 X1

I1

I2

G

S1

R1 R2 R3S2C1 C2 C3

1U 1V 1W

2N’2U’

2N2W2V2U

CONTROLLER FOR AUTOMATIC TUNING

Typical CAHORS arc suppressing coil

Single line diagram

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Example of application

Input user’s data:Rated voltage: 22 kVMaximum capacitive neutral current to be compensated: 200 AMaximum time to endure the maximum capacitive neutral current: 30 sEarth resistance = 6 Ω & Touch voltage <= 100 V (according to applicable regulation with quick fault clearance)Min. active residual fault current necessary to keep operative the feeder protections: 10 A

Resulting rated values for the machine:Ix range: 20 A.......200 A by Step equal to 3,6 AMax admissible total fault current = 15 ADimensions and weight: L x l x H = 2 060 x 1 500 x 2 050, total weight 5 000 kg

Electronic controller

The “electronic controller”, built in one 19” rack, will switch automatically the AsC elements to reach the tuning point almost instantaneously, whenever there is a change into the zero-sequence capacitance of the MV distribution.

- Extra-speed communication and easy connection work by optic fibre HMI- Convivial monitoring interface for local operations- The launching of the automatic procedure to determine the resonant point can be achieved either automatically (by setting the periodic interval), or after pre-set variation of the residual voltage, or by local or remote commands- The seeking is performed with an accurate and extra-rapid algorithm based on a “circle method” which requires only 3 variations of the AsC position to determine the exact tuning point- The resonant curve, residual voltage and computed active current are displayed on a Graphical 320 x 240 colour TFT

- Tuned position and residual voltage are taken out on a 4-20 mA current loop- Earth faults are also detected and indicated- Recorded events are stamped and dated (500 max), as well as the last resonant curves (20 max.), allowing the keeping of statistics (possibility to connect a PC to the CPU serial interface RS232 on the front panel)- Alarms are displayed and taken out on contacts outputs- Convenient graphical help for maintenance purpose, possibility for manual tuning by rough or accurate scanning, set-up of over or undercompensation shift, master / slave parallel operation, etc…

Main features:

Arc Suppression Coil Controller (ASCC) Arc Suppression Coil (ASC)

Outside on siteInside the Relaying Building

•

Optic Fiber

Cahors InternationalZI de Regourd - CS 90149 - 46003 Cahors Cedex 9 - FRANCETél. : +33 (0)5 65 35 82 01 - Fax : +33 (0)5 65 35 82 [email protected]

www.groupe-cahors.com

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"nordic" product range (gb)

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