ZGS13-Z(H) Series Combined Transformer (10 kV, 20 kV)

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. Featuring reliable power supply, rational design, rapid and flexible installation, convenient operation, compact size, and low cost, the American‑style pad‑mounted substation is suitable for both outdoor and indoor applications and is widely used in municipal projects, grid modernization and upgrades, industrial parks, residential communities, commercial centers, and high‑rise buildings.

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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 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. With its reliable power supply, rational design, rapid and flexible installation, convenient operation, compact footprint, and low cost, the American‑style pad‑mounted transformer is suitable for both outdoor and indoor applications. It is widely used in municipal projects, grid modernization and upgrades, industrial parks, residential communities, commercial centers, and high‑rise buildings, among other settings.

　　Product Features and Functions

　　1. Fully sealed, fully insulated design with no required clearance distances, ensuring reliable personal safety.

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

　　3. It can be used in both ring networks and terminal applications, with convenient and rapid switching, enhancing power supply flexibility and accelerating service delivery.

　　4. Energy-saving, low losses, low noise, low temperature rise, and strong overload capacity, among others.

　　5. The cable joint can handle a load current of 200 A and, in emergency situations, can be operated as a load switch, while also possessing the characteristics of an isolating switch—easy and flexible to operate.

　　6. Equipped with dual-fuse protection, ensuring safe and 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 heavy rainfall.

　　Technical Performance Parameters

　　ZGS13-Z(H) Series Combined Transformer (10 kV Class)

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	6.0 ±2×2.5% or 6.3 ±2×2.5% or 10 ±2×2.5%	0.4	Yyn0 Dyn11	1.5	80	630/600	4.0	1800	1250	2000	200	320	1230
50				1.3	100	910/870		1800	1250	2000	275	60	1280
63				1.2	110	1090/1040		1800	1250	2000	315	385	1370
80				1.2	130	1310/1250		1800	1500	2000	360	420	1450
100				1.0	150	1580/1500		1800	1500	2000	400	450	1490
125				1.0	170	1890/1800		1800	1500	2000	500	480	1580
160				1.0	200	2310/2200		1800	1500	2000	550	510	1600
200				1.0	240	2730/2600		1800	1550	2000	600	550	1740
250				0.9	290	3200/3050		1800	1550	2000	680	570	1830
315				0.9	340	3830/3650		1800	1650	2000	880	595	1990
400				0.8	410	4520/4300		1800	1650	2000	1050	700	2100
500				0.8	480	5410/5150		1800	1750	2000	1200	760	2460
630				0.6	570	6200	4.5	1800	1750	2000	1450	805	2800
800				0.6	700	7500		1800	1800	2000	1700	900	3570
1000				0.6	830	10300		1800	1800	2000	1800	985	3960
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.

　　ZGS13-Z(H) Series Combined Transformer (20 kV Class)

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 ±2×2.5%	0.4	Yyn0 Dyn11	1.5	80	690/660	5.5	2000	1350	2000	210	335	1300
50				1.3	100	1010/960		2000	1350	2000	290	380	1405
63				1.2	110	1200/1150		2000	1350	2000	340	410	1525
80				1.2	130	1440/1370		2000	1600	2000	400	460	1630
100				1.0	150	1730/1650		2000	1600	2000	430	505	1725
125				1.0	170	2080/1980		2000	1600	2000	520	565	1845
160				1.0	200	2540/2420		2000	1600	2000	600	590	1955
200				1.0	240	3000/2860		2000	1750	2000	640	650	2060
250				0.9	290	3520/3350		2000	1750	2000	730	680	2130
315				0.9	340	4210/4010		2000	1750	2250	960	710	2250
400				0.8	410	4970/4730		2000	1750	2250	1150	730	2375
500				0.8	480	5940/5660		2000	1850	2250	1300	760	2470
630				0.6	570	6820	6.0	2000	1850	2500	1610	795	2850
800				0.6	700	8250		2000	1950	2500	1880	815	3600
1000				0.6	830	11330		2000	1950	2500	1930	865	4030
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.