«NORDIC» Product Range
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).
2
Contents TPC “S ELF-P ROT ECT ED” T RANS FORMER
EQUI P MENT FOR “L O CAL ” CO M PENSATIO N
p .6 ECO B L O C P REFABRICAT ED S UBS T AT ION
p .8
«Nordic» Product Range
p.4
“ AsC”: ARC S UP P RES S ING COI L WIT H AUT OMAT I C CONT ROLLER
p . 10
3
TPC “SELF-PROTECTED” TRANSFORMER 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.
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.
4
Electrical and dimensional characteristics Coupling: Dyn11 (Yyn0) Primary voltage: 11 kV +-2x2,5%, or 22 kV +-2x2,5%
Dimensions Rated Power
P0 (W)
Pk (W)
50 kVA
90
100 kVA
Oil Weight (kg)
Total Weight (kg)
1100
110
420
700
1160
160
620
920
780
1220
200
890
1000
910
1300
260
1150
Length L (mm)
Width W (mm)
Height H (mm)
1100
810
660
145
1750
820
200 kVA
250
2750
315 kVA
360
3900
50, 100 kVA TPC
«Nordic» Product Range
Secondary voltage: 420 V (240 V) (On request: 11 kV+ 4x2,5% - 2x2,5% 400V)
200, 315 kVA TPC
MV connections:
250 A plug-in bushings according IEC 60137 alternative: 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)
Single line diagram SCHEMA 0: « TPC TRANSFORMER »
A
B
C
It>
TPC
n
a
b
c
Typical CAHORS TPC
5
EQUIPMENT FOR “LOCAL” COMPENSATION 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 transformers with built-in inductance (“local compensation”)
6
Electrical and dimensional characteristics Rated Voltages
P0 (W)
Pk (W)
100 kVA
11 kV + 2x2,5% 420 V
215
1800
100 kVA
22 kV + 2x2,5% 420 V
280
200 kVA
11 kV + 2x2,5% 420 V
200 kVA
22 kV + 2x2,5% 420 V
Current limitations lx = inductive la = active
Dimensions
Oil Weight (kg)
Total Weight (kg)
Length L (mm)
Width W (mm)
Height H (mm)
lx = 10 A, 300 s la = <2,5% * lx
910
780
1395
220
1000
1275
lx = 15 A, 300 s la = <2,5% * lx
910
780
1430
250
1200
525
2450
lx = 10 A, 300 s la = <2,5% * lx
1250
795
1460
300
1500
525
2450
lx = 15 A, 300 s la = <2,5% * lx
1235
790
1470
350
1600
«Nordic» Product Range
Rated Power
100 kVA « TOTEM »
200 kVA « TOTEM »
Single line diagram SCHEMA 3: « TOTEM »
MV T.P.C It>
TRANSFORMER
Stabilisation winding
INDUCTANCE
LV
Typical CAHORS Totem
7
ECOBLOC PREFABRICATED SUBSTATION SCHEMA 6: « ECOBLOC SSM SUBSTATION »
It> TPC TRANSFORMER
n
«Standard» MV / LV
L1, L2, L3
1U , 1V, 1W
LV COMPARTMENT
1U , 1V, 1W
MV COMPARTMENT
«1 kV» With Inductance («Local compensation»)
07: « SCHEMA 12: « ECOBLOC SSM SUBSTATION + INDUCTANCE SCHEMA »
ECOBLOC SSM SUBSTATION »
1 kV
TPC TRANSFORMER
TPC TRANSFORMER
950 V 420 V It>
It>
(option)
INDUCTANCE
n n
L1, L2, L3
I0 >
L1, L2, L3 1U , 1V, 1W 1U , 1V, 1W
LV COMPARTMENT
1U , 1V, 1W
MV COMPARTMENT
« 1 kV » COMPARTMENT
1U , 1V, 1W
MV COMPARTMENT
MV / LV ECOBLOC According to international standard IEC 62 271-202
Electrical and dimensional characteristics Coupling: Dyn11 (Yyn0) Primary voltage: 11 kV +-2x2,5%, or 22 kV +-2x2,5% On request: 11 kV + 4x2,5% - 2x2,5% 400 V
8
Secondary voltage: 420 V (240 V) Alternatively: 11 kV (or 22 kV) / 950 V (+ 420 V on request) Built-in protection: by TRANSFIX TPC
Dimensions Rated Power
P0 (W)
Pk (W)
50 kVA
90
100 kVA
Total Weight (kg)
Length L (mm)
Width W (mm)
Height H (mm)
1100
1700
1110
1640
1090
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
«Nordic» Product Range
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 switch The 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 arrangements Cable-fault Directional fault detectors
MV / LV ECOBLOC + Inductance for “Local Compensation” Complementary applicable standard: IEC 60076-6 “Reactors”
Electrical and dimensional characteristics Coupling: ZN(d)yn11 (with stabilization winding)
Rated Power
Rated Voltages
P0 (W)
Pk (W)
100 kVA
11 kV + 2x2,5% 420 V
215
1800
100 kVA
22 kV + 2x2,5% 420 V
280
160 kVA
22 kV + 2x2,5% 420 V
200 kVA 200 kVA
Current limitations lx = inductive la = active
Dimensions
Total Weight (kg)
Length L (mm)
Width W (mm)
Height H (mm)
lx = 10 A, 300 s la = <2,5% * lx
1700
1100
1640
1650
1275
lx = 15 A, 300 s la = <2,5% * lx
1700
1100
1640
1750
300
2200
lx = 15 A, 300 s la = <2,5% * lx
1700
1210
1640
1820
11 kV + 2x2,5% 420 V
525
2450
lx = 10 A, 300 s la = <2,5% * lx
2000
1210
1640
1950
22 kV + 2x2,5% 420 V
525
2450
lx = 15 A, 300 s la = <2,5% * lx
2000
1210
1640
1950
9
“AsC”: ARC SUPPRESSING COIL with 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 «zerosequence» voltage curve can thus be amplified to determine accurately the resonant point.
Single line diagram 1U V 1U-1N
1V
1W
1
2
V 1N-G = Vr / 3
1
2
2N’ 2U’ 2N 2W 2V 2U
1N
I1
S1
X3
X1
X2
R1
I2
R2
R3
C1 S2
1
Ir 2
V2 N’2U’ 240Vac
CONTROLLER FOR AUTOMATIC TUNING
G
Typical CAHORS arc suppressing coil
10
C2
C3
Example of application Input user’s data: Rated voltage: 22 kV Maximum capacitive neutral current to be compensated: 200 A Maximum time to endure the maximum capacitive neutral current: 30 s Earth 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:
«Nordic» Product Range
Ix range: 20 A.......200 A by Step equal to 3,6 A Max admissible total fault current = 15 A Dimensions 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.
Arc Suppression Coil Controller (ASCC)
Arc Suppression Coil (ASC)
• Optic Fiber Inside the Relaying Building
Outside on site
Main features: - 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…
11
www.groupe-cahors.com
Non binding document - Ref 21A2000002 - 02/2016 - Photo credit : Groupe Cahors, Goanda, Studio 8
Cahors International ZI de Regourd - CS 90149 - 46003 Cahors Cedex 9 - FRANCE TĂŠl. : +33 (0)5 65 35 82 01 - Fax : +33 (0)5 65 35 82 14 sales.support@groupe-cahors.com