Republic of Vanuatu Modular Transformer (American-style Pad-Mounted Transformer)

Combined Transformer (Combined Substation, American-style Pad-Mounted Transformer) I. Product Overview The ZGS Combined Transformer is a domestically produced American-style pad-mounted transformer. As a critical power supply unit in cable-based distribution networks, this product integrates high-voltage control, protection, substation functions, and distribution equipment into a complete, pre-assembled, modular system. It is widely used in both urban and rural distribution networks.

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Republic of VanuatuModular Substation (American-Style Pad-Mounted Transformer)

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Product Description

Modular Transformer (Modular Substation, American-Style Pad-Mounted Transformer)

I. Product Overview

The ZGS modular transformer is a domestically produced American-style packaged substation. As a critical power supply unit in cable-based distribution networks, this product integrates high-voltage control, protection, power transformation, and distribution equipment into a comprehensive, pre-assembled modular system. It is widely used in both urban and rural distribution networks.

This product features high-voltage load switches and high-voltage fuses immersed in transformer oil, available in two structural designs: either integrated with the transformer tank or housed in a separate enclosure. The oil tank adopts a fully sealed design and is equipped with components such as an oil thermometer, oil level gauge, pressure gauge, pressure relief valve, and drain valve to monitor the transformer's operational status. The product lineup includes ring network, terminal, and dual-power supply configurations. Additionally, depending on the complexity of low-voltage feeder requirements, our company’s modular substation products are categorized into three structural types—standard, enhanced, and comprehensive—to provide users and design engineers with greater flexibility and cost-effectiveness during equipment selection.

II. Operating Environmental Conditions

Altitude: Not exceeding 2000 meters;
Ambient temperature : Maximum temperature +40°C;
Minimum temperature: -30°C;
Maximum daily average temperature: +30°C,
Highest annual average temperature: +20°C;
Relative humidity : The daily average does not exceed 95%; the monthly average does not surpass 90%.
Ground slope : No more than 3 degrees;
Earthquake intensity : Seismic horizontal acceleration not exceeding 0.4 m/s²
The vertical seismic acceleration does not exceed 0.2 m/s².
Outdoor wind speed : Not exceeding 35 m/s;
Installation Environment : The surrounding air is free from significant contamination by corrosive or flammable gases, and the installation site experiences no severe vibrations.

If ordering this product exceeds the conditions specified above, please consult with our company's technical specialists.

▬▬▬ Negotiable supplier products for use in specialized environments

3. Meaning of the Model

4. Main Technical Parameters

1. Loss Level

Table 1: Performance Parameters of 10kV, 11 Series 30–2500 kVA Double-Winding Oil-Immersed Transformers with No-Load Voltage Regulation

Rated Capacity	Voltage Combination Kv		Connection Group Designation	No-load loss	Load Loss	No-load current	Short-circuit impedance
Rated Capacity	High pressure	Low pressure	Connection Group Designation	No-load loss	Load Loss	No-load current	Short-circuit impedance
30	6 6.3 10 10.5 11	0.4 0.69	Yyn0 Dyn11 Yzn11	100	630 / 600	1.5	4
50				130	910 / 870	1.3
80				180	1480/1430	1.2
100				200	1780/1700	1.1
125				240	2130/2040	1.1
160				280	2590/2480	1.0
200				340	3070/2940	1.0
250				400	3600 divided by 3450	0.9
315				480	4310/4130	0.9
400				570	5090/4870	0.8
500				680	6090/5780	0.8
630				810	7010	0.6	4.5
800				980	8480	0.6
1000				1150	11450	0.6
1250				1360	13360	0.5
1600				1640	16140	0.5
2000				1940	20240	0.4	5
2500				2290	23490	0.4	5

Table 2: Performance Parameters of 10kV, 13 Series 30–2500 kVA Double-Winding Oil-Immersed Transformers with No-Load Voltage Regulation

Rated Capacity	Voltage Combination Kv		Connection Group Designation	No-load loss	Load Loss	No-load current	Short-circuit impedance
Rated Capacity	High pressure	Low pressure	Connection Group Designation	No-load loss	Load Loss	No-load current	Short-circuit impedance
30	6 6.3 10 10.5 11	0.4 0.69	Yyn0 Dyn11 Yzn11	80	630 / 600	1.5	4
50				100	910 / 870	1.3
80				130	1310/1250	1.2
100				150	1580/1500	1.1
125				170	1890/1800	1.1
160				200	2310/2200	1.0
200				240	2730/2600	1.0
250				290	3200 / 3050	0.9
315				340	3830/3650	0.9
400				410	4520/4300	0.8
500				480	5410/5150	0.8
630				570	6200	0.6	4.5
800				700	7500	0.6
1000				830	10300	0.6
1250				970	12000	0.5
1600				1170	14500	0.5
2000				1550	18300	0.4	5
2500				1830	21200	0.4	5

Table 4: Performance Parameters of 10kV, 20 Series 30–2500 kVA Double-Winding Oil-Immersed Transformers with No-Load Voltage Regulation

Rated Capacity	Voltage Combination Kv		Connection Group Designation	No-load loss	Load Loss	No-load current	Short-circuit impedance
Rated Capacity	High pressure	Low pressure	Connection Group Designation	No-load loss	Load Loss	No-load current	Short-circuit impedance
30	6 6.3 10 10.5 11	0.4 0.69	Yyn0 Dyn11 Yzn11	70	505/480	1.8	4
50				90	730/695	1.6
63				100	870/830	1.5
80				115	1050/1000	1.4
100				135	1265/1200	1.3
125				150	1510/1440	1.2
160				180	1850/1760	1.1
200				215	2185/2080	1
250				260	2560/2440	0.9
315				305	3065/2920	0.8
400				370	3615/3440	0.7
500				430	4330/4120	0.7
630				510	4960	0.6	4.5
800				630	6000	0.6
1000				745	8240	0.5
1250				870	9600	0.4
1600				1050	11600	0.4
2000				1225	14640	0.4	5
2500				1440	14840	0.4	5

Table 5: Performance Parameters of 10kV, 22 Series 30–2500 kVA Double-Winding Oil-Immersed Transformers with No-Load Voltage Regulation

Rated Capacity	Voltage Combination Kv		Connection Group Designation	No-load loss	Load Loss	No-load current	Short-circuit impedance
Rated Capacity	High pressure	Low pressure	Connection Group Designation	No-load loss	Load Loss	No-load current	Short-circuit impedance
30	6 6.3 10 10.5 11	0.4 0.69	Yyn0 Dyn11 Yzn11	65	455/430	1.8	4
50				80	655/625	1.6
63				90	785/745	1.5
80				105	945/900	1.4
100				120	1140/1080	1.3
125				135	1360/1295	1.2
160				160	1665/1585	1.1
200				190	1970/1870	1
250				230	2300/2195	0.9
315				270	2760 / 2630	0.8
400				330	3250/3095	0.7
500				385	3900 divided by 3710	0.7
630				460	4460	0.6	4.5
800				560	5400	0.6
1000				665	7415	0.5
1250				780	8640	0.4
1600				940	10440	0.4
2000				1085	13180	0.4	5
2500				1280	13360	0.4	5

Note: For transformers with a rated capacity of 500 kVA or less, the load loss and total loss values listed above the slash in the table apply to the Dyn11 connection group, while those below the slash are applicable to the Yyn0 connection group. Additionally, the measured values for no-load loss and load loss are allowed to deviate by up to +15%; the measured total loss can vary by up to +10%, and the measured short-circuit impedance is permitted to differ by ±10%. Finally, the measured no-load current deviation is allowed to be within +30%.

2. Insulation Level

Table 6

Rated Voltage (RMS)	Maximum device voltage (RMS)	Rated Lightning Impulse Withstand Voltage (Peak)		Rated short-time power frequency withstand voltage (1 min) (RMS)
Rated Voltage (RMS)	Maximum device voltage (RMS)	Full-wave	Clipped wave
≤1	2	▬	▬	5
6	7.2	60	65	25
10	12	75	85	35
20	24	125	140	55
35	40.5	200	220	85

5. Product Structure

Our company has developed a variety of integrated, compact American-style substations featuring "U," "H," and L-shaped designs, as well as high-voltage models with built-in metering systems—tailored to meet the usage habits and requirements of China's power distribution equipment. In terms of power distribution, the low-voltage outgoing lines can be equipped with main switches, total and individual circuit metering, multiple branch circuit outputs, phase-loss trip mechanisms, automatic reactive power compensation, real-time electricity monitoring, and other advanced automation features. These substations are equally suitable for a wide range of applications as European-style substations, fully replacing traditional brick-and-mortar transformer stations. They also offer exceptional flexibility in installation, ensuring reliable and safe power supply while maintaining high mobility.

It also has the following unique advantages:

1. Low-noise and environmentally friendly

2. No Leakage

3. Strong short-circuit resistance

4. High dielectric strength

5. Excellent weather resistance

Pin-shaped