YB-12/0.4 MV/LV Package Substation (Compact Secondary Substation)

Product Description

• YB-12/0.4 compact secondary substation features physically segregated compartments for MV switchgear, transformer and LV distribution. Two layout options are available: U-shape (Pin-type, MV-Transformer-LV side-by-side) and straight-line (Mu-type, linear compartment arrangement) layouts. Full physical separation of compartments minimizes electrical interference and improves overall safety margin.
• The enclosure is fabricated of high-quality galvanized steel plate or composite panel, treated by pickling-phosphating and electrostatic powder-coating for anti-corrosion. It provides protection against rain, dust, solar radiation, condensation and animal intrusion.
• Internal thermal-insulation, forced-ventilation, noise-reduction and dehumidification structures are equipped for long-term stable operation under harsh overseas outdoor conditions such as high-temperature, high-humidity and dusty/sandy environments.
• Modular design enables flexible configuration for MV unit, transformer unit, LV unit and protection system. Custom-tailored protection schemes can be provided to match different national grid codes, load levels and power-supply-reliability requirements. It covers global application scenarios including residential, industrial, photovoltaic and municipal power distribution. Project-specific customization is supported with easy maintenance, stable performance and long service life.

Product Functions

• Power Conversion & Distribution: Steps-down 11 kV / 12 kV / 22 kV medium-voltage to 400 V low-voltage, realizing multi-feed power delivery for various industrial and residential loads.
• Comprehensive Electrical Protection: Fuses, temperature relays, numerical protection relays and circuit-breakers jointly provide protection against short-circuit, overload, over-current, earth-fault and transformer over-temperature. Faulty circuit can be rapidly isolated to prevent fault propagation.
• Note: Buchholz (non-electrical) protection is optional for oil-immersed transformers and not applicable to dry-type transformers.
• Accurate Energy Metering: Metering modules can be fitted on both MV and LV sides to satisfy overseas commercial-industrial energy statistics and trade-billing requirements.
• Automatic Reactive-Power Compensation: Low-voltage integrated capacitor-bank compensation system automatically optimizes system power factor, reduces line losses and improves power-supply quality.
• Multi-Mode Power Supply: Supports ring-network supply and radial-network supply. Dual-source standby supply requires additional dedicated MV dual-source switch unit.
• Intelligent Monitoring & Remote Communication: Optional intelligent measurement-and-control components collect operational data, support on-line monitoring and remote operation and maintenance for unattended smart-grid overseas sites.
• Safety Interlock Protection: Complete mechanical and electrical interlocks prevent human-induced mis-operation. Internal-arc-withstand (IAC) classification is optional upon request, ensuring safety for equipment and operating personnel.

Product Configuration

Medium-Voltage Unit

• Available options: load-break switch, fuse-load-switch combination, vacuum circuit-breaker. Incoming/outgoing feeder, ring-main and MV-metering modules are optional.
• Fuse-load-switch combination provides complete transfer-current protection, offering full-range transformer fault-protection within its transfer-current rating.

Protection Selection Guide:

• Residential / small-scale ordinary projects: Fuse for short-circuit protection, transformer temperature relay as standard;
• Industrial, PV and critical-load projects: Equipped with numerical protection relays providing instantaneous over-current, time-delayed over-current, overload, earth-fault and non-electrical protection.

Transformer Unit

• Available types: oil-immersed transformer or dry-type transformer. Power range: 50 kVA ~ 1600 kVA.
• All transformers are equipped with temperature-protection relay as standard, supporting over-temperature alarm and over-temperature tripping. Buchholz protection is optional for oil-immersed transformers.

Low-Voltage Unit

• Consists of incoming feeder, outgoing feeders, reactive-power-compensation and metering circuits.
• Incoming circuit-breaker is fitted with thermal-magnetic release as standard. Electronic trip unit (ETU) is optional to achieve full selective L-S-I-G protection (Long-time overload, Short-time short-circuit, Instantaneous short-circuit, Ground-fault).
• Extended intelligent measuring-and-control relay supports data acquisition and remote monitoring.

Auxiliary Unit

• Outdoor-rated enclosure, forced-cooling system, dehumidifier, internal cabinet lighting, earthing system, full set of mechanical and electrical interlocks, complete protection relay assemblies.

Technical Data

Application Scenarios

• New-energy power plants: Outdoor power transformation & distribution for distributed PV, wind-power and energy-storage stations.
• Urban building power supply: Residential communities, commercial complexes, office buildings and hotels.
• Industrial & mining sites: Industrial parks, general manufacturing plants, non-explosive-hazard zones of mines and oil-fields.
• Note: This is a general-purpose outdoor substation, not suitable for explosive-hazardous areas.
• Municipal utilities: Urban grid retrofitting, street lighting, parks and municipal-engineering power distribution.
• Transportation infrastructure: Airports, high-speed-rail stations, ports, tunnels and rail-transit auxiliary power supply.
• Medium-&-small-scale projects: Temporary construction-site power supply, rural grid upgrading and plant-expansion distribution projects.