ZGS11-Z(H) Series Combined Transformer, 20 kV

A combined‑type transformer (also known as an American‑style pad‑mounted transformer) integrates the transformer core, high‑voltage load switch, protective fuses, and other components into a single sealed oil‑filled enclosure. It is equipped with a full suite of operational monitoring instruments, including pressure gauges, pressure relief valves, oil level indicators, and oil temperature gauges. American‑style pad‑mounted transformers offer outstanding performance characteristics such as reliable power supply, rational design, rapid and flexible installation, convenient operation, compact size, and low cost. They can be deployed both outdoors and indoors and are widely used in industrial parks, residential communities, commercial centers, high‑rise buildings, and various other applications.

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Box-type Substation Series

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Product Description

　　Overview

　　A combined‑type transformer (also known as an American‑style pad‑mounted substation) integrates the transformer core, high‑voltage load switch, protective fuses, and other components into a single sealed oil‑filled enclosure. It is equipped with a full suite of operational monitoring instruments, including pressure gauges, pressure relief valves, oil level indicators, and oil temperature gauges. This type of substation offers outstanding performance characteristics such as reliable power supply, rational design, rapid and flexible installation, convenient operation, compact size, and low cost. It can be deployed both outdoors and indoors and is widely used in industrial parks, residential communities, commercial centers, high‑rise buildings, and various other applications.

　　Characteristics of American-style pad-mounted substations

　　1. Fully sealed, fully insulated design—eliminating the need for clearance distances and ensuring reliable personal safety.

　　2. Compact in size and with a streamlined design, it occupies only about one-third the footprint of comparable domestic transformer substations of the same capacity.

　　3. It can be used in both ring networks and terminal applications, with seamless switching that enhances the flexibility of power supply.

　　4. Low losses—on par with those of comparable domestic transformers—and, upon customer request, a range of combined‑type transformers is available, featuring loss levels corresponding to Series 9, Series 10, Series 11, and amorphous‑alloy core designs.

　　5. The cable joint can handle a load current of 200 A; in emergency situations, it can be operated as a load switch and also exhibits the characteristics of an isolating switch, offering convenient and flexible operation.

　　6. Equipped with dual-fuse protection for reliable operation.

　　7. The enclosure features an anti-corrosion design and a special paint finish, making it suitable for a wide range of harsh environments, such as highly polluted areas prone to frequent storms.

　　Technical Performance Parameters

Rated Capacity (kVA)	Rated Voltage (kV)		Connection Group	No-load Electric current (%)	Loss (W)		Impedance Voltage (%)	Reference external dimensions (mm)			Reference weight (kg)
Rated Capacity (kVA)	High pressure	Low pressure	Connection Group	No-load Electric current (%)	No-load	Load	Impedance Voltage (%)	long	wide	High	Body of the vessel	Heavy oil	Total weight
30	20.0 ±2×2.5% or 22 ±2×2.5% or 24 ±2×2.5%	0.4	Yyn0 Dyn11	2.1	90	690/660	5.5	1800	1320	2000	220	350	1340
50				2.0	130	1010/960		1800	1320	2000	315	390	1388
63				1.9	150	1200/1150		1800	1320	2000	370	415	1424
80				1.8	180	1440/1370		1800	1550	2000	410	465	1454
100				1.6	200	1730/1650		1800	1550	2000	440	500	1493
125				1.5	240	2080/1980		1800	1550	2000	480	510	1544
160				1.4	290	2540/2420		1800	1550	2000	590	528	1602
200				1.3	330	3000/2860		1800	1600	2000	680	560	1744
250				1.2	400	3520/3350		1800	1600	2000	800	560	1832
315				1.1	480	4210/4010		1800	1700	2000	905	636	2038
400				1.0	570	4970/4730		1800	1700	2000	980	730	2367
500				1.0	680	5940/5660		1800	1800	2000	1102	765	2564
630				0.9	810	6820	6	1800	1800	2000	1405	840	3020
800				0.8	980	8250		1800	1850	2000	1580	980	3472
1000				0.7	1150	11330		1800	1850	2000	1690	1060	3798
Note: For three-phase transformers with a rated capacity of 500 kVA or less, the load loss values above the diagonal line in the table apply to the Dyn II connection group, while those below the diagonal line apply to the YynO connection group.