YBx-12/0.4

Outdoor prefabricated substation (European type)

Prefabricated transformer substation combining HV switchgear, power transformer and LV switchboard in one enclosure. Used in urban distribution networks, industrial and infrastructure facilities and for temporary power supply.

Key parameters

Rated voltage HV / LV: 12 / 0.4 kV
HV-side protection: load break switch + fuse combination
Transformer: hermetically sealed oil-immersed S9/S10/S11 or dry-type

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General information

The YBx-12/0.4 outdoor prefabricated substation (European type) is widely used in urban power grid reconstruction, residential areas, high-rise buildings, industrial and mining enterprises, hotels, shopping centres, airports, railways, oil fields, ports, motorways, and for temporary power supply — both indoors and outdoors.

Type designation

YBx-12/0.4-x

YB	Intelligent integrated (prefabricated) substation
x	Design serial number
12/0.4	Rated voltage (high / low), kV
x	Transformer rating

Service conditions

Altitude: not more than 1000 m.
Ambient temperature: −25 °C … +40 °C.
Relative humidity: daily average not more than 95 %, monthly average not more than 90 %.
Installation site: free of fire and explosion hazards, conductive dust, chemically aggressive gases and severe vibration. If the conditions are outside these limits, the design is agreed separately.

Functions and features

High-voltage switchgear, transformer and low-voltage switchgear — "three in one", high degree of completeness.
Full set of protections on the high-voltage and low-voltage sides, safe and reliable operation, simple maintenance.
Small footprint, lower capital investment, short manufacturing time, easy relocation.
Flexible wiring scheme options.
Original design: strong double-layer honeycomb enclosure (composite panels) — thermal insulation and ventilation for heat dissipation, attractive appearance, high degree of protection. Enclosure material optional: stainless steel, aluminium alloy, cold-rolled steel sheet, polymer-coated steel sheet.
Various versions: general-purpose, "cottage" type, compact and others.
The high-voltage ring main unit can be equipped with a feeder terminal unit (FTU) for distribution automation, for reliable detection of short circuits and single-phase earth faults; it supports the "four remote" functions (telemetering, telesignalling, telecontrol, teleadjusting) — for easy upgrading to network automation.

Transformer

The intelligent integrated substation uses hermetically sealed oil-immersed low-loss transformers of the S9, S10, S11 series; environmentally friendly dry-type transformers with cast-resin or NOMEX paper insulation can also be used. The transformer can be mounted on a trolley for easy rolling in and out.

High-voltage side

The high-voltage side is normally protected by a "load break switch — fuse" combination: if the fuse of one phase blows, a three-phase linked trip occurs. Load break switches — gas-filled (auto-pneumatic), vacuum, SF6 and other types to choose from; they can be fitted with a motor operating mechanism for automation and future upgrading. Fuses — high-voltage current-limiting fuses with striker: reliable operation, high breaking capacity; the main technical parameters are given in the table below. For transformers rated above 800 kVA, protection by ZN12, ZN28, VS1 and similar vacuum circuit breakers can be used.

Low-voltage side

The main switch on the low-voltage side is an air circuit breaker or intelligent circuit breaker, selective protection. Outgoing feeder breakers — new-generation moulded-case circuit breakers: small dimensions, short arc emission, up to 30 outgoing feeders. Intelligent automatic reactive power compensation device — with contactor or contactless (thyristor) switching, at the customer's choice.

Technical parameters of high-voltage fuses

Type		Rated voltage, kV	Breaking current, A	Breaking current, kA	Rated fuse-link current, A
Designation (BS)	Designation (variant 2)	Rated voltage, kV	Breaking current, A	Breaking current, kA	Rated fuse-link current, A
SDL※J	XRNT-12	12	40	31.5	6.3; 10; 16; 20; 25; 31.5; 40
SFL※J	XRNT-12	12	100	31.5	50; 63; 71; 80; 100
SKL※J	XRNT-12	12	125	31.5	125

Note: the symbol ※ depends on the striker: N — without striker, A — with striker.

Low-voltage side circuit breakers

Type	Release type	Rated release current, A	Breaking capacity, kA (AC 380 V)
DW15-630	Thermal-magnetic or electronic	315; 400; 630	40
DW15-1000		630; 800; 1000	50
DW15-1600		1600	50
DW15-2500		1600; 2000; 2500	60
CW1-2000	Intelligent	630; 800; 1000; 1250; 1600; 2000	65 (80)
CW1-3200	Intelligent	2000; 2500; 3200	100

Substation design

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