HJATIS HJ-PMS 34.5kV 4000kVA pad-mounted substation, featuring tamper-proof and dead-front safety designs for highly integrated commercial distribution networks
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HJATIS HJ-MCS-12 12kV 4000A compact metal-clad switchgear IEC compliant for power distribution
HJ-MCS-12 Series Metal-Clad Switchgear
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HJATIS HJ-CSS 40.5kV 2500kVA compact secondary substation, providing a turnkey power distribution solution with a compact footprint for urban infrastructure
HJ-CSS Series Compact Secondary Substation

HJ-PMS Series Pad-Mounted Substation

Up to 34.5kV / 4000kVA / Dead-Front Design

The HJ-PMS Series Pad-Mounted Substation (American Type) is an ultra-compact, fully insulated, and tamper-resistant distribution center. It seamlessly integrates a highly efficient oil-immersed transformer, medium-voltage load switch, and low-voltage distribution into a single sealed tank. Designed for public safety and rapid installation, it is the preferred choice for modern underground distribution networks.

 

Ideal for Public Spaces & Renewables:

  • ✓ Residential Communities & Commercial Centers
  • ✓ Renewable Energy (Solar Parks & Wind Farms)
  • ✓ Street Lighting & Urban Underground Grid Upgrades
  • ✓ Mining Facilities & Oil Field Power Distribution
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Description
Core Advantages
Technical Specs

1. Ultra-Compact & Low Profile Design

Sharing the same oil tank for the transformer and MV switchgear, the HJ-PMS is approximately 1/3 the size of traditional European substations. Its low-profile, unobtrusive design blends seamlessly into urban landscapes, residential lawns, and commercial campuses without requiring complex civil structures.

2. Dead-Front & Tamper-Resistant Security

Public safety is maximized with a fully tamper-proof enclosure featuring no externally accessible screws or hinges. The medium voltage section utilizes shielded, touch-safe "dead-front" elbow connectors, providing a fully insulated and sealed connection that eliminates the risk of accidental electrocution.

3. Highly Reliable Dual-Fuse Protection

The system is safeguarded by an advanced two-stage protection mechanism: a highly sensitive bayonet-type expulsion fuse handles secondary short circuits and overloads, while a backup current-limiting fuse intercepts high-fault internal currents. This dual coordination ensures precise and rapid fault clearance.

4. Flexible Ring Main & Radial Operations

Engineered for versatile grid integration, the HJ-PMS effortlessly supports both Ring Main (Loop) and Radial (Terminal) feed network topologies. The robust load break switch enables safe load switching and rapid grid reconfiguration during maintenance.

Global Factory Acceptance & Turnkey Support

Every HJ-PMS unit undergoes rigorous routine testing aligned with strict IEC/IEEE standards before dispatch. We proudly support Remote Video FAT (Factory Acceptance Test) for our global EPC clients, ensuring total transparency.

To support diverse project logistics, this series is shipped fully assembled as a CBU (Completely Built Unit). Simply place it on the pad, connect the cables, and energize.

Technical Specifications

(Note: Parameters cover standard configurations based on the ZGS series. Custom capacities and voltage ratings are available for specific EPC and Renewable requirements.)

System & Power Parameters
Transformer Capacity 50kVA - 1600kVA
(Custom high-capacity up to 4000kVA for Solar/Wind)
Rated Voltage (MV Side) 12kV / 24kV / 35kV
(Compatible with 13.8kV / 34.5kV systems)
Rated Voltage (LV Side) 0.4kV / 0.69kV
MV Feed Topology Ring Main (Loop Feed) / Radial (Terminal Feed)
Rated Current (MV Load Switch) 315A / 630A
Withstand & Protection Ratings
Rated Frequency 50 Hz / 60 Hz
Transformer Insulation Type High-Flashpoint Mineral Oil / FR3 Envirotemp Fluid (Custom)
MV Connection Type Fully Insulated Dead-Front Elbow Connectors
Enclosure Protection Degree IP33 Standard
(Tamper-resistant NEMA 3R equivalent)

Operating Environment

  • Ambient Temperature: -30°C to +40°C.
  • Altitude: Standard ≤ 1000m (High-altitude designs available).
  • Installation Site: Outdoor pads, public green spaces, or alongside roads free from explosive dust.
  • Design Standard: Strictly complies with IEC 60133 / IEEE C57.12.34.

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