1250 kVA RMU Type Pad-mounted Transformer

The ZGS series from TAILI ELECTRIC is a compact and reliable power distribution solution widely used across North and South America. Designed for outdoor pad-mounted installation, it combines transformer, switching, and protection functions into one integrated unit—ensuring high reliability, cost efficiency, and easy operation.

With its small footprint and reasonable structure, the ZGS transformer is ideal for urban distribution networks, as well as railway systems, solar farms, and wind power plants.

Depending on customer requirements, it can be configured as ring network, terminal, or dual power supply type. Optionally, it can be equipped with a TPC protection system, designed to handle capacitive earth fault currents in underground cables, ensuring safe and stable operation of sensitive electrical loads.

RMU Type Pad-mounted Transformer integrates a ring main unit on the primary side, allowing power to pass through the transformer as part of a loop distribution network.
It provides high supply reliability and operational flexibility, making it suitable for urban grids, industrial parks, and critical power distribution systems.

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Basic Info.

Primary Voltage	13.8kV
Secondary Voltage	480v/277v
Vector Group	Dyn11, Dyn5
Impedance	4%, 6%
Capacity (Power Rating)	1250kVA
H.V. Tap Range	±2 × 2.5% or others
BIL (Basic Insulation Level)	30–150 kV
Standards	IEC, IEEE, ANSI, DOE
Certificates	CE, SGS, CNAS

Features of RMU Type Pad-mounted Transformer

1. Loop feed (ring network) capability
Designed for loop or ring main distribution systems, allowing power to pass through to downstream feeders.

2. Integrated RMU on primary side
Typically configured with two load break switches (in/out) and one transformer protection unit (fuse or circuit breaker).

3. High supply reliability
Enables sectionalizing and fault isolation without interrupting power supply to other loads.

4. Flexible operation and expansion
Suitable for network expansion and future grid upgrades without major system modification.

5. Compact all-in-one design
Transformer, RMU, and low-voltage compartment integrated into a single enclosure.

6. Ideal for critical power networks
Widely applied in urban distribution networks, industrial parks, commercial complexes, and public utilities.

Accessories of Pad Mounted Transformers

1. Elbow type cable joint: Used to connect cables at an angle in electrical systems, providing a secure connection.
2. Bushing insert with well and gasket and protective cap: An essential part in electrical gear. The gasket seals, and the cap protects it from damage.
3. Bay - O - Net Fuse with dual sensors: A fuse with sensors to monitor its status and protect the electrical system from faults.
4. Four - position sidewall switch: Installed on sidewalls, it has four positions to control electrical circuits.
5. Oil level gauge: Measures the oil level in a transformer to ensure normal operation.
6. Vacuum manumeter: Measures the vacuum inside the transformer for proper functioning.
7. Thermometer: Monitors the transformer's temperature to prevent overheating.
8. Pressure release: Releases internal pressure to safeguard the transformer.

01 Panels of pad Mounted Transformer