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Prefabricated Box-Type Substation (American Style)

The ZGS series prefabricated pad-mounted substation (commonly known as the “American-style” pad-mounted substation) features a “pin”-shaped configuration, in which the transformer and the high- and low-voltage switchgear are tightly integrated into a single unit. Notably, the transformer is exposed on three sides to the ambient air, ensuring excellent heat dissipation, while its enclosure is physically separated from the high- and low-voltage switchgear housings for convenient maintenance. The transformer is an 813-series oil-immersed type with a plate-type oil tank, no conservator tank, and a fully sealed design. The high- and low-voltage bushings, tap changer, oil-level indicator, pressure relief valve, drain valve, and other components are all mounted on the end plates of the high-voltage compartment, providing a well-arranged layout that facilitates observation and operation. A steel partition separates the high-voltage and low-voltage compartments, ensuring that the transformers in each compartment operate relatively independently while still maintaining the integrity of the entire pad-mounted substation. This results in a compact structure, small footprint, and light weight. Distribution switchgear is installed on both the high- and low-voltage sides.
Category: Box-type Substation Series
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Product Overview

The ZGS series prefabricated pad-mounted substation (commonly known as the “American-style” pad-mounted substation) features a “pin”-shaped configuration, in which the transformer and the high- and low-voltage switchgear are tightly integrated. Notably, the transformer is exposed on three sides to the ambient air, ensuring excellent heat dissipation, while its enclosure can be separated from the high- and low-voltage switchgear housings for convenient maintenance.

The transformer is an 813-series oil-immersed type, featuring a plate-type oil tank, no conservator tank, and a fully sealed design. The high- and low-voltage bushings, tap changer, oil-level indicator, pressure relief valve, drain valve, and other components are all mounted on the end plates of the high-voltage compartment, with a well-considered layout that facilitates observation and operation. A steel partition separates the high-voltage and low-voltage compartments, ensuring that the transformers in each compartment operate relatively independently while still maintaining the integrity of the entire packaged substation. This results in a compact structure, small footprint, and light weight. Distribution switchgear is installed on both the high- and low-voltage sides.

Terms of Use

● Cooling method: air self-cooling;

● Altitude: ≤ 1000 m;

● Ambient temperature: Outdoor ambient temperature shall not exceed 40°C or fall below -45°C; the monthly average temperature shall not exceed 30°C, and the annual average temperature shall not exceed 20°C.

● Relative humidity: At 25°C, the relative humidity of the air shall not exceed 95%, and the monthly average shall not exceed 90%.

● Seismic resistance level: horizontal acceleration shall not exceed 0.3 m/s², and vertical acceleration shall not exceed 0.15 m/s²;

● Ambient conditions: The installation environment shall be free from significant contamination, explosive or corrosive gases, and dust.

● Installation location: The equipment shall be installed in an environment free from severe vibration and impact, and must be mounted on a cement platform or other flat, solid surface.

● If the requirements for normal operating conditions cannot be met, users are requested to consult with our company to resolve the issue.

Civil Engineering Drawings for Cable Inlets and Outlets at the Substation

Technical Requirements:

● Refer to the assembled actual dimensions for sizing;

● The concrete foundation shall have a smooth, level surface, and the packaged substation shall be secured to the foundation using pressure plates.

● The configuration of the grounding busbar and cable fixing brackets may be determined based on actual conditions;

● Cable supports and grounding busbars shall be pre-embedded;

● The location of the cable entry/exit holes shall be determined on a case-by-case basis;

● After the combination is installed, there must be a clear space of at least 1.5 meters in front of the switch to facilitate operation;

● The grounding grid may be constructed using 12-gauge galvanized round steel or 40×4 galvanized flat copper, and the grounding resistance shall comply with the requirements of the power authority.

Technical Specifications

Project

Unit

Parameters

Rated voltage

kilovolt

10/0.4 (High pressure / Low pressure)

Maximum operating voltage

kilovolt

12 (High-voltage side)

Rated frequency

Hertz

50

Rated capacity

kilovolt-ampere

50-1600

1-minute power-frequency withstand voltage

kilovolt

35

Impulse voltage

kilovolt

75

Cooling method

 

Oil-Immersed, Naturally Cooled (ONAN)

Breaking current of high-voltage backup fuse

KA

50

Breaking current of plug-in fuse

KA

2.5

Ambient temperature

degrees Celsius

-35~+40

Permissible temperature rise of the coil

degrees Celsius

65

No-load voltage regulation

 

±5% or ±2×2.5%

Noise Level

database

50

Protection Level

 

IP43

Substation Structural Diagram

 

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