ABB UniPack-S Steel Compact Secondary Substation

ABB UniPack-S Steel Compact Secondary Substation

Product Overview

Product positioning: ABB's steel compact secondary substation (CSS) is designed to replace traditional concrete substations. Its core advantages are lightweight, high safety, and fast installation, suitable for various complex scenarios, and can meet the needs of renewable energy grid connection, industrial power supply, utility distribution network, infrastructure power supply, and more.

Core standard compliance:

Main standards: IEC 62271-202 ed. 2 (core standard for prefabricated substations), IEC 62271-200 (medium voltage switchgear), IEC 61439 (low voltage switchgear), IEC 60076 (power transformers)

Environmental certification: ISO 9001 (quality), ISO 14001 (environment), recyclable products, low environmental impact

Core differentiation advantages:

Material: hot-dip galvanized steel plate+polyester powder coating, corrosion protection level up to C4 H (optional C5 level), suitable for harsh environments

Weight: lighter than concrete substations, convenient for long-distance transportation and on-site lifting

Installation: Factory prefabrication and completion of testing, on-site only requires connection of incoming and outgoing cables, greatly reducing installation time

Safety: Through IAC-AB internal arc testing, the cabin is independently designed, and all doors are locked to prevent unauthorized entry

Core technical specifications

Detailed description of category key parameters

Suitable for oil immersed/dry-type transformers with a maximum rated capacity of 3500 kVA, and the transformer compartment supports natural cooling

The maximum rated voltage is 36 kV, and the voltage range on the MV side covers 12/24/36 kV, with a maximum of 800 V on the LV side

Protection level MV/LV cabin: IP43 (optional IP54); Transformer compartment: IP23D (optional IP35/IP45) to prevent foreign objects and water from entering, suitable for different environments (such as dusty and rainy areas)

Short circuit withstand current MV side: maximum 21 kA/1s; LV side busbar: up to 66 kA/1s to ensure equipment stability in case of short circuit faults

Natural ventilation design with temperature levels of 10K and 20K to avoid transformer capacity reduction and adapt to high temperature areas

The grounding system TN, TT, and IT are compatible with multiple grounding methods for distribution systems

Structure and Construction Design

Basic type:

Type 1: Galvanized steel foundation (requires separate oil storage pit)

Type 2: Concrete slab foundation (with built-in oil storage pit, can be directly installed on the ground)

Type 3: Compact foundation (integrated oil storage pit, directly installed on the ground)

Main structure:

Material: Hot dip galvanized steel plate (pre treated+polyester powder coating), high mechanical strength, corrosion resistance

Roof: Removable design (convenient for transformer installation and maintenance), standard slope of 6 °, optional 18 ° slope in snowy areas, roof load-bearing capacity ≥ 250 kg/m ²

Door body: Stainless steel hinges, 2-point or 3-point lock design, walk-in substation equipped with internal door handles and emergency handles

Oil storage pit: sealed and waterproof, capable of accommodating 100% of transformer oil volume, preventing oil leakage and environmental pollution

Cabin design:

Separate compartments: medium voltage (MV) switchgear compartment, low voltage (LV) switchgear compartment, transformer compartment to avoid mutual interference

Walk in: including internal operating channels, complying with the operating space requirements of IEC 62271-202 ed.2 for internal arc protection

Non walk-in: optimized footprint, external operation, suitable for space constrained scenarios

Compact: Higher integration, saving installation space

Key equipment configuration

(1) Medium voltage (MV) switchgear

Equipment type, model series, core parameters, applicable scenarios

SF6 gas insulated switchgear SafeRing/SafePlus rated voltage 12/24 kV, rated current 630/1250 A, short-circuit withstand current up to 21 kA/3s, high requirements for space and reliability

UniSec air insulated switchgear has a rated voltage of 12/17.5/24 kV and a rated current of 630/800/1250 A. It supports universal scenarios for withdrawable circuit breakers and is easy to maintain

Load switch NAL/NALF air insulation, suitable for simple distribution network scenarios with low cost and basic switch requirements

(2) Low voltage (LV) switchgear

It is divided into three categories: LVS 1 (basic type), LVS 2 (medium type), and LVS 3 (high-end type), with the following core parameters:

Model Rated Voltage Rated Current Bus Type Applicable Scenarios

LVS 1 800 V 400~2500 A DIN/Kaberdon/Z-Busbar small capacity, basic inlet and outlet line requirements

LVS 2 800 V 400~2500 A DIN/Kaberdon/Z-Busbar medium capacity, requiring auxiliary equipment such as measurement and surge protection

LVS 3 800 V 1000~5000 A DIN/Kaberdon/Z-Busbar with large capacity and complex protection requirements (equipped with ACB/MCCB)

Key components: Tmax series molded case circuit breaker (up to 1600 A), Emax 2 series air circuit breaker (up to 6300 A), InLine vertical fuse (160~1250 A)

(3) Transformer

Type: Oil immersed transformer (mainstream), dry-type transformer (special scenarios such as industrial and photovoltaic power stations)

Capacity: up to 3500 kVA

Cooling method: Natural ventilation (relying on the natural ventilation system of the substation, without the need for additional cooling fans)

Protection: Transformer compartment IP23D or above to prevent foreign objects from entering and affecting operation

Compatibility and Installation of Smart Grid

Intelligent Function Level (Level 4 Scalable):

Level 1: Basic monitoring (MV/LV side current, voltage, energy consumption measurement)

Level 2: Monitoring+Control (Remote Control of MV/LV Switchgear)

Level 3: Monitoring+Control+Precise Measurement (MV side high-precision measurement)

Level 4: Complete protection (incoming and outgoing circuit breaker protection+all front-end functions)

Communication support: compatible with Modbus, Profinet, EtherNet/IP, IEC 61850 and other protocols, can be connected to SCADA systems

Installation and maintenance:

Installation process: Only the concrete foundation needs to be prepared on site, and after the substation is hoisted in place, the incoming and outgoing cables can be connected for debugging, without the need for complex civil engineering

Maintenance features: Removable roof (convenient for transformer maintenance), independent compartments (non interfering with each other), door lock+safety barrier (preventing misoperation)