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Home Compact Substation Compact Substation TNB
Compact Substation TNB
Compact Substation TNB

Compact Substation TNB

Model: TNB
OEM and ODM Services: Available
Enclosure: PINEELE standard
Brand: PINEELE, a Brand Under ZHENGXI
Form: All- packaged Type
Scope of Application: Suitable for industrial power distribution, voltage stabilization, and transformer protection. Widely used in commercial buildings, manufacturing plants, and utility substations.
Reviewed By: Zheng Ji, Senior Electrical Engineer at PINEELE
18+ years of experience in HV switchgear design & testing.
Published On: 31 March, 2025
Last Updated: 31 March, 2025
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Table of Contents
  • What Is a Compact Substation (TNB Type)?
  • TNB Compact Substation Standards
  • Typical Configuration of TNB Compact Substation
  • Standard Ratings
  • Design Features of TNB-Approved Compact Substation
  • Application Areas
  • Advantages of TNB Compact Substation
  • Maintenance & Inspection
  • Price Range in Malaysia (2024–2025)

What Is a Compact Substation (TNB Type)?

A Compact Substation (CSS) is a fully enclosed prefabricated unit that integrates a medium-voltage switchgear, distribution transformer, and low-voltage switchboard into one weatherproof enclosure. The TNB-compliant CSS is specifically engineered to meet the design, safety, and installation requirements of Tenaga Nasional Berhad (TNB) — Malaysia’s national electricity utility.

Compact Substation TNB

Used widely in Malaysia’s power distribution system, TNB-style compact substations offer fast deployment, space efficiency, and reliable operation in urban, commercial, and industrial environments.


TNB Compact Substation Standards

Compact substations designed for use in TNB networks must comply with the following:

  • TNB Technical Guidebook (latest edition)
  • IEC 62271-202 – High-voltage switchgear and controlgear – Prefabricated substation
  • IEC 60076 – Power transformers
  • TNB Specification No: TNBES 198, 201, 203 (project-dependent)
  • Suruhanjaya Tenaga (Energy Commission) electrical safety code
  • Local authority approvals (e.g., SIRIM, ST registration)
Compact Substation

Typical Configuration of TNB Compact Substation

ComponentDescription
MV Switchgear11kV SF6-insulated RMU (typically 3 or 4-way), TNB-approved brand
Transformer315–1000 kVA, 11/0.433kV oil-immersed sealed type (ONAN)
LV SwitchboardOutgoing MCCBs, metering panel, CTs, and terminals for low-voltage loads
EnclosureCompartmentalized mild steel or stainless-steel structure (IP54–IP65)
VentilationNatural or forced air, louvers, and filters
Cable TerminationBottom-entry cable ducts, earthing bar and links
ProtectionSurge arresters, protection relays, fault indicators
Lighting & SocketInternal service lighting, 13A plug, exhaust fan (optional)

Standard Ratings

SpecificationValue
Rated Power315 kVA / 500 kVA / 630 kVA / 1000 kVA
Primary Voltage11 kV
Secondary Voltage400/230 V
Frequency50 Hz
CoolingONAN (Oil Natural Air Natural)
Insulation ClassClass A / B
Enclosure ProtectionIP54 (minimum), IP65 (optional)
Temperature Rise≤ 60°C on windings
EarthingTN-S or TT system compliant

Design Features of TNB-Approved Compact Substation

  • Three-compartment structure (MV, Transformer, LV) with individual access doors
  • Internal arc-tested RMUs with SF6 insulation
  • Corrosion-resistant enclosure with epoxy powder coating
  • HV & LV compartments separated by metallic barriers
  • TNB-type lock and interlock systems for safety
  • Forced-air ventilation optional in high-load zones
  • Lifting hooks, base frame, and anti-vibration pads for transport and installation
  • Pad-mounted or skid-mounted options available
Compact Substation

Application Areas

TNB Compact Substations are widely used in:

  • Residential developments (terrace housing, condominiums)
  • Commercial areas (malls, supermarkets, retail parks)
  • Light industrial parks and SME zones
  • Government facilities and schools
  • Urban substations and transformer upgrading projects
  • Renewable energy projects connected to the 11kV grid
  • Temporary power supply in construction and mobile applications

Advantages of TNB Compact Substation

Space-saving: All-in-one design ideal for urban or limited-space environments
Quick Installation: Factory-assembled and pre-tested before delivery
TNB Compliance: Meets all utility specifications for fast approval
Safety Assured: Arc-proof, compartmentalized, and interlock-secured
Minimal Civil Work: Requires only a level concrete pad
Customization: Available with solar-ready features or hybrid modules
Low Maintenance: Sealed transformer and RMU reduce site servicing needs


Maintenance & Inspection

TNB recommends periodic inspection and maintenance to ensure substation reliability:

  • Visual inspection of transformer tank, bushings, and oil level
  • Cleaning of air vents and filters in the enclosure
  • Infrared scanning of LV terminations (annually)
  • Functional testing of MCCBs, relays, and indicators
  • Oil dielectric strength (BDV) test every 3–5 years

Price Range in Malaysia (2024–2025)

As of current market estimates, a TNB-compliant 315–1000 kVA compact substation costs approximately:

RM 85,000 – RM 180,000
(subject to configuration, transformer rating, RMU brand, and materials)


The Compact Substation TNB type is the ideal solution for medium-voltage to low-voltage step-down transformation in Malaysia. Designed to meet TNB’s strict standards, these substations offer reliable performance, compactness, and easy integration into residential, commercial, or light industrial zones.

With factory-tested modular design, built-in safety features, and full compliance with TNB and IEC requirements, compact substations are the smart choice for modern power distribution infrastructure in Malaysia.

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