Protection & control
Relays, interlocks, trip circuits and monitoring.
Integrated electrical substation systems
Substation Transformer Solutions
Bring transformation, MV/LV distribution and protection together around your project. Explore integrated substation configurations for industrial, utility and infrastructure applications.
System approachTransformer + switchgear
ConfigurationFixed or transportable
Engineering inputsSLD, load & site conditions
QuotationProject-based review
System Architecture
One coordinated path from supply to loads.
Incoming Supply
Voltage & source
MV Switchgear
Switching & protection
Transformer
Voltage conversion
LV Distribution
Distribution & protection
Outgoing Feeders
Project loads
02 System architecture
One system. Coordinated equipment.
A substation transformer is one component. An integrated substation also defines switching, distribution, protection and the interfaces between equipment and the site.
- 01
Incoming power supply
Source, voltage & fault level
- 02
MV switchgear
Switching, isolation & protection
- 03
Power / distribution transformer
Voltage transformation
- 04
LV distribution
Incoming & outgoing protection
- 05
Outgoing feeders
Connections to project loads
Metering
CT/VT interfaces and utility or owner requirements.
Auxiliary power
AC/DC supplies for controls and operational duties.
Earthing
Earth bonds, neutral arrangement and site earth grid.
Enclosure / housing
Segregation, ventilation, access and environmental protection.
Cable interfaces
Terminations, entry positions and supply boundaries.
03 Solution configurations
Choose the arrangement around the project.
Compact Package Substation
MV switchgear, a distribution transformer and LV distribution arranged in segregated compartments within a compact enclosure. A package substation brings these functions together around a defined site footprint.
- Typical fit
- Utility distribution, industrial facilities and infrastructure sites with limited space.
- Engineering focus
- Confirm ventilation, maintenance access, cable entry, public access protection and oil containment where applicable.
Skid-Mounted Substation
Transformer, switchgear and protection equipment assembled on a common structural base. Modules can be arranged for the available space and lifted or transported as an agreed assembly.
- Typical fit
- Industrial expansions, mining and remote sites where modular handling is useful.
- Engineering focus
- Check skid loads, lifting points, shipping dimensions, foundations and responsibility for inter-module connections. A skid alone does not provide weather protection.
Containerized Substation / E-House
A prefabricated electrical enclosure can house MV/LV switchgear, protection, control and auxiliary systems. The transformer may be in a separate compartment or outside the electrical house, according to the design.
- Typical fit
- Infrastructure and industrial projects requiring a controlled equipment environment.
- Engineering focus
- Define heat rejection, ventilation or HVAC, fire separation, escape routes, cable penetrations and the transformer-to-enclosure interface. An E-House is not necessarily an ISO freight container.
Mobile / Trailer-Mounted Substation
A transportable system combining a transformer, switchgear, protection/control equipment and electrical interfaces on one or more engineered trailers or transport platforms. The platform and deployment arrangement are part of the system specification.
- Typical fit
- Temporary grid connections, planned outages and emergency power restoration where a suitable source is available.
- Engineering focus
- Review axle and road limits, stabilizers, ground bearing capacity, access, earthing, cable reach, protection settings and commissioning. A mobile substation needs an incoming power source; it does not generate power.
Compare the system interfaces
| Project consideration | Compact package | Skid-mounted | Containerized / E-House | Mobile / trailer-mounted |
|---|---|---|---|---|
| Main electrical interfaces | Incoming MV cables · LV feeders · earth grid | Cable terminations · inter-module links · earth bonds | Transformer cables · control signals · auxiliary supply | Temporary incoming/outgoing connections · controls · site earth |
| Deployment requirements | Fixed plinth; cable trenches and access clearances | Engineered lifting plan, supports and site cable connections | Foundation, enclosure access, fire and environmental review | Transport permits as required, stable site and commissioning plan |
| Mobility | Fixed | Relocatable with engineering | Fixed or relocatable by design | Transportable |
04 Engineering applications
Start with how the power will be used.
Industrial power distribution
Coordinate transformer loading, motor starting and feeder discrimination with the plant load schedule. Provide fault levels, harmonic loads and continuity requirements.
Utility distribution networks
Align the incoming arrangement, metering, interlocks and remote-control interfaces with the network operator’s connection requirements and protection policy.
Infrastructure projects
Plan the substation footprint, fire separation, maintenance routes and expansion interfaces alongside civil works and the project installation sequence.
Mining and remote sites
Modular assemblies can suit restricted site resources. Check access roads, altitude, dust, corrosion exposure, lifting equipment and available auxiliary supplies.
Temporary power supply
Relocatable systems can connect a temporary load to an available source. Confirm connection capacity, operating period, cable routes, grounding and recommissioning at each site.
Emergency power restoration
A mobile arrangement can bridge an outage when compatible equipment and a suitable supply are available. Verify fault duty, protection settings, transport access and safe energization procedures.
05 Project configuration
Define your system requirements.
Choose a configuration direction and enter the project requirements you know. Add available electrical, installation and transport details to your project brief.
Additional engineering requirements
06 Technical considerations & standards
Coordinate the equipment and the site.
Electrical system & fault duty
Define the network arrangement, load profile, insulation levels and prospective short-circuit duty at each bus. Equipment ratings must be coordinated across the system.
Transformer & switchgear coordination
Review transformer impedance, inrush, vector group, neutral arrangement, switching duty and the MV/LV current ratings together. Confirm cable or busbar interfaces and thermal performance.
Protection, control & metering
Specify the protection study, relay functions, CT/VT requirements, trip supplies, interlocks, metering accuracy and any SCADA protocol or signal list. Agree settings and testing responsibilities.
Earthing & site interfaces
Define the earth-grid interface, neutral earthing, touch/step-voltage assessment, cable entries and termination responsibilities. Confirm civil foundations and oil containment where needed.
Enclosure & environment
Provide ambient temperature, altitude, humidity, pollution, corrosion and seismic conditions. Review ingress protection, ventilation, fire separation and safe maintenance access.
Transport & installation
Agree module sizes, mass, lifting provisions, road/axle limits and the assembly sequence. Mobile systems also require stability, ground-bearing and repeated-deployment checks.
Standards follow the equipment and assembly scope.
- IEC 62271-202
- For enclosed AC prefabricated substations within its defined scope: rated voltages above 1 kV and up to and including 52 kV. Applicability depends on the actual assembly, connection arrangement and service conditions; it is not a universal standard for every E-House or mobile system.
- IEC 60076 series
- For the transformer equipment and the relevant design/test requirements. Select the applicable parts for the transformer type and duty; transformer compliance does not establish compliance of the complete substation.
- IEC 61439 series
- For LV switchgear and controlgear assemblies. Part 1 provides general rules and is used with the relevant product part, such as Part 2 where applicable. MV switchgear needs its own applicable equipment standard and specification.
Agree the applicable editions, destination rules, utility requirements and test/verification scope in the project specification. These references are not a declaration of certification, tested ratings or approval of an HKXR substation system.
Discuss compliance & engineering documents07 Project information
Define the scope before quotation.
Prepare the electrical, physical and interface information below so the equipment scope and responsibilities can be agreed before quotation.
Single-line diagram & equipment list
Show incoming and outgoing circuits, transformers, bus sections, protection and metering. Include load data and electrical specifications.
General arrangement & site conditions
Confirm the footprint, access clearances, transformer location, enclosure layout, cable entries and transport envelope.
Supply boundary & responsibility schedule
Identify internal wiring, external cables, auxiliaries, earth connections, civil works, installation and commissioning responsibilities.
- 01
Share the project
SLD, specifications, equipment list and site conditions.
- 02
Review the configuration
Confirm feasibility, interfaces and open technical questions.
- 03
Agree the supply scope
Define equipment, documents, tests and site responsibilities.
- 04
Prepare the quotation
Issue a project-specific offer against the agreed requirements.
08 Decision support
Frequently asked questions
How does a compact substation differ from a conventional substation?
A compact package groups MV switching, transformation and LV distribution in an integrated enclosure with defined internal interfaces. A conventional site-built arrangement can use separately installed equipment and buildings. Compare maintenance access, ventilation, fault duty, public access protection, expansion and civil works rather than footprint alone.
How is the right system configuration determined?
Start with the single-line diagram, source and load voltages, load profile, fault levels and continuity requirements. Then assess environment, available space, access and installation method. A compact, skid, E-House or mobile arrangement is an engineering choice; the final equipment combination and supply scope need project review.
How are the transformer and switchgear integrated?
Their ratings, protection, cable or busbar connections, earthing, interlocks and thermal conditions are coordinated as a system. Equipment can share an enclosure or base, or be connected as separate modules. The agreed drawings must define equipment boundaries and every site connection.
Is an E-House the same as a container with a transformer inside?
No. An E-House typically provides an electrical equipment environment for switchgear, protection and control. The transformer may be outside or in a separate compartment, depending on ventilation, fire separation, access and the project specification. Containerized and E-House arrangements should be defined by their function and layout.
Can the solution support temporary or mobile applications?
A mobile or relocatable configuration may be considered for temporary connections, planned maintenance or restoration after an outage. Confirm a suitable incoming supply, voltage compatibility, transport restrictions, site stability, grounding, cable interfaces and commissioning. HKXR must confirm project feasibility and the proposed supply scope before quotation.
What drawings and information are needed for a quotation?
Send the single-line diagram, equipment list, electrical specifications, load schedule and site layout if available. Include installation conditions, transport/space limits, protection and metering requirements, destination, schedule and proposed scope of supply. If drawings are not ready, identify the missing information for the initial review.
How are applicable standards and tests agreed?
Identify the destination, utility rules, project specification and the standards applicable to each component and the assembled system. Agree the editions, verification evidence, routine/type/special tests and witnessing requirements in the technical offer. Referencing a standard on this page is not a claim of system certification.
Who supplies site installation and commissioning?
Define the supply boundary in the quotation: equipment, internal wiring, external cables, civil works, earth grid, unloading, assembly, testing and energization. Identify the owner, EPC, installer and manufacturer responsibilities in an interface schedule. Installation and commissioning are not automatically included with equipment supply.
09 / Let’s discuss your project
Request a project quotation
Share the single-line diagram, equipment list, electrical specifications, installation conditions and proposed scope of supply.
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