MT-10/0.4-2 X 630
(MT) Compact transformer substations
Basic Information
Height (mm):
2550
Width (mm):
2350
Depth (mm):
4550
Techniniai parametrai
Rated frequency:
50Hz
Degree of protection:
IP 44
Altitude above sea level:
≤ 2000 m
Ambient temperature:
'-35+35°C
Relative humidity:
≤ 100% (at +25°C)
Ventilation:
Passive (natural convection) / Active (mechanical forced ventilation)
Basic Information
Description
Designed for receiving 10 kV, 50 Hz electrical power and transforming it to 0.4 kV voltage for distribution to users; this is an outdoor service transformer substation connected to external networks via underground cables.
Enclosure:
The substation consists of a reinforced concrete foundation and a metal enclosure with a removable roof. The substation is divided into six sections separated by partitions: two 10 kV compartments, two power transformer compartments, two 0.4 kV compartments.
Standards:
LST EN 62271-202
10 kV voltage compartment
Rated voltage: 10 kV
10 kV
Maximum voltage:
12 kV
Test voltage (50Hz, 1 min):
28 kV
Rated frequency:
50 Hz
Impulse test voltage (1.2/50 μs):
75 kV
switchgear compartment maintenance:
External
Gas-Insulated Switchgear insulation:
Air or SF6 gas
Network neutral:
Isolated
Degree of protection:
IP 3X
Service category:
LSC2A
Switchgear
According to AB 'ESO' technical requirements
Surge arresters:
According to AB 'ESO' technical requirements
0.4 kV voltage compartment
Rated current of 0.4 kV busbars:
≥1000 A
Short-circuit current of 0.4 kV busbars:
25 kA
Peak short-circuit current of 0.4 kV busbars:
40 kA
Maintenance of 0.4 kV section:
One-sided - external
Rated insulation voltage of devices:
690 V
Additional information
Medium voltage:
Installed are UAB 'ARMETLINA' VIN-10(NAL) or VIN-10(OMB) cubicles compliant with standard LST EN 62271-200, featuring 10 kV indoor power switches (LST EN 62271-1; LST EN 62271-102; LST EN 62271-103; LST EN 62271-105) according to AB 'ESO' requirements. Switchgear with SF6 gas insulation compliant with standards LST EN 62271-1, LST EN 62271-100, LST EN 62271-200, including ABB SAFE PLUS or SAFE RING, SCHNEIDER ELECTRIC RM6 or FBX, SIEMENS 8DJH switchgear.
Transformer:
Two prepared spaces with oil collection pits for three-phase hermetic oil transformers; (≤1500x1000x1800 mm) up to 630 kVA.
Low voltage:
Two busbar sections; Two incoming fuse-switch blocks; Sectional fuse-switch block; Space for control metering; Space for commercial metering (KAS); Designated space for up to 8 linear fuse-switch blocks per section; Aluminum (Al) or Copper (Cu) busbars with pressed-in bushings (for convenient mounting of fuse-switch blocks); Auxiliary panel (SRS).
Grounding conductors:
Transformer construction: 10 mm²; Doors: 4 mm².
Internal use panel
Plug socket ~230V with grounding contacts, protected by RCCB and 1-phase C16A circuit breaker; 1-phase C6A circuit breaker for protection of 10 kV short-circuit indicator power supply; 1-phase C6A circuit breaker for lighting protection.
Verification metering
One location (three-phase) is allocated for the control electrical metering device and test terminal in the 0.4 kV distribution equipment compartment; upon order, current transformers are installed and connected.
Equipment details:
The power transformer is loaded from the top by removing the roof. The transformer is placed on wheels into designated fixed positions that prevent movement. MV – Medium Voltage compartment with equipment; LV – Low Voltage compartment with equipment; KAS – Commercial metering.
