200 KVA Pad Mount Three-Phase Oil-Immersed Distribution Transformer

 

This 200 kVA pad-mounted transformer prioritizes energy efficiency and dependable outdoor operation. Its three-phase design ensures smooth voltage regulation and safe service in standard distribution environments.

 

 

 

 

The pad - mounted transformer serves as an integrated prefabricated product that combines distribution network power supply unit cables, high - voltage control, protection, substation, and power distribution equipment. It is widely applied in urban and rural distribution networks. The transformer and high - low voltage equipment are closely connected into one unit. Three sides of the transformer are exposed to the air, ensuring good heat dissipation conditions. Moreover, the transformer can be separated from the high - low voltage equipment housing, facilitating maintenance. Power distribution switchgear is installed on the high and low voltage sides.

 

 

 

 

Taking the ZBW series as an example, the model is represented as ZBW - 12/0.4 - □ - □ - □.
The first part "ZBW" indicates the prefabricated substation.
"12/0.4" represents the rated voltage levels, with 12kV for the high - voltage side and 0.4kV for the low - voltage side.
The subsequent boxes respectively denote the high - voltage measurement of rated voltage (KV), low - voltage measurement of rated voltage (KV), and rated capacity of the transformer (KVA).
 

 

 

 

 

Cooling Method: Air Self-Cooling
Operating Environment Requirements:
The outdoor ambient temperature shall not exceed 40°C and shall not be lower than -45°C; the altitude shall not exceed 1,000 meters; the monthly average temperature shall not exceed 30°C; and the annual average temperature shall not exceed 20°C.
At a temperature of 25°C, the relative air humidity shall not exceed 95%, and the monthly average relative humidity shall not exceed 90%.
Horizontal acceleration shall not exceed 0.3g, and vertical acceleration shall not exceed 0.15g.
The installation environment shall be free from obvious pollution, and shall be free of explosive or corrosive gases and dust. Additionally, the installation site shall be free from violent vibration and impact; the equipment must be installed on a cement platform or another flat, solid platform.

Note:
Should there be any other circumstances not covered by these technical specifications, the user shall negotiate with the Company.

 

 

 

 

• Compact structure, small size, easy installation.
• Applicable to ring network and terminal power supply, ensuring personal safety.
• Low loss, low noise, excellent performance, and anti-theft box structure.
• Low temperature rise and strong overload capacity.

 

 

 

 

• Transformer and Chambers: The pad-mounted transformer uses the 813 series oil-immersed transformer with a chip-type oil tank (no oil cushion, fully enclosed). High/low-pressure bushings, tap changers, oil level indicators, pressure release valves, oil release valves, etc., are mounted on the high-pressure chamber end plate for easy observation and operation. Its high/low-pressure chambers are separated by steel plates (relatively independent) and integrated into a complete box.
• Components: It is equipped with plug - in fuses, pressure gauges, pressure relief valves, oil level gauges, oil thermometers, load switches, high - voltage cable joints, off - circuit tap changers, ground points, drain valves, and low - voltage switch cabinets, etc.
• Load Switch: It is an oil - immersed, three - phase linkage switch with a spring operating mechanism. It can be operated with load, and its closing speed has nothing to do with the operating force. There are types such as two - station, four - station T type, and four - T position V type to choose from.
   

 

 

This product complies with the following standards:

• GB/T 17467-1998 High-Voltage/Low-Voltage Pre-Installed Substations
• DL/T 537-1993 Technical Conditions for Ordering 6-35kV Box-Type Substations

 

 

 

 

The skeleton structure of the cabinet shell is made of channel steel and angle steel, ensuring high mechanical strength. The shell itself is crafted from aluminum alloy plates, featuring a smooth surface, elegant appearance, and excellent corrosion resistance. The base of the cabinet is elevated above the foundation by 300–600 mm.

All the doors open outwards from the cabinet shell, with an opening angle of more than 90 degrees, and are equipped with positioning devices. Each door is fitted with a handle, a hidden latch, and waterproof, anti-blocking, and anti-rust locks. The cabinets feature a sealed, theft-proof structure. To ensure that the temperature of all electrical equipment does not exceed the maximum allowable temperature during long-term operation (even under normal ambient air temperatures), the cabinets are equipped with both adequate natural ventilation and heat insulation measures.

The cabinets of the prefabricated substation are provided with a dedicated grounding conductor, which is fitted with fixed connection terminals for connecting to the grounding grid (with no fewer than two terminals in total). The grounding terminals utilize copper bolts with a diameter of no less than 12 mm. The grounding conductor is made of a copper strip, with a current density not exceeding 200 A/mm² and a cross-sectional area of no less than 30 mm²-this design ensures that when the maximum short-circuit current flows through the conductor, there is no overheating and no risk to surrounding objects. Additionally, the dynamic and thermal stability of the dedicated grounding conductor must match the grounding method of the high-voltage power distribution equipment.
 

 

S/N	Name	Unit	Technical Parameter
1	Rated Voltage	KV	10/0.4
2	High-voltage Side Rated Voltage	KV	10
3	Low-voltage Side Rated Voltage	KV	0.4
4	Maximum operating voltage (High voltage side)	KV	12
5	Rated Frequency	Hz	50
6	Rated Capacity	KVA	150-1600
7	High-voltage Switch Heat Stable Capacity	KA	20/26
8	Low-voltage Main Circuit Breaker Rated Short-circuit Breaking Capacity	KA	35
9	Low-voltage Distribution Circuit Breaker Rated Short-circuit Breaking Capacity	KA	35
10	High-voltage Load Switch Transfer Current	A	>1500
11	1 min Power Frequency Withstand Voltage	KV	35
12	Lightning Impulse Voltage	KV	75
13	Cooling Mode	-	Oil immersed self-cooling
14	High-voltage Backup Fuse Breaking Current	KA	50
15	Breaking Current of Plug-in Fuse	KA	2.5
16	Ambient Temperature	℃	-35 ~ +40
17	Coil Allowable Temperature Rise	K	65
18	No-load Voltage Regulation	%	±5% or ±2 × 2.5%
19	Noise Level	dB	<50
20	Protection Grade of Box Shell	-	Not less than IP3X

 

 

 

 

1. Basic load-bearing requirement: The foundation must withstand a pressure of over 100 kPa.
2. Foundation for elevated areas: Ensure proper drainage around the foundation. The foundation should be constructed with red bricks and cement mortar; the external walls shall be plastered with 1:2 cement mortar (20 mm thick), with 3% waterproofing agent added.
3. Cable chamber drainage: The bottom surface of the cable chamber shall be slightly inclined toward the water collection pipe to facilitate drainage.
4. Steel mesh and rib installation: Use a 150×300 steel mesh with (10×20) diamond-shaped openings; weld ribs to the inner wall of the outer frame.
5. Compliance with standards: Foundation construction shall comply with the relevant provisions of JGJ16-83 Code for Electrical Design of Buildings.
6. Grounding system requirements: Conduct routine inspections on the main grounding steel and its connecting ends. The grounding wire led from the cable trench can be routed along the perimeter of the ring network cabinet or extended from one side for grounding. The grounding resistance shall be ≤ 4 ohms.
7. Dimension reference: Follow the dimensions specified in the construction drawing (as recommended).
8. Cable well flexibility: For user convenience, cable wells can be installed in 3 to 4 directions on-site based on actual conditions.

 

 

 

 

S/N	Name	Unit	Technical Parameter
1	Rated Voltage	KV	10/0.4
2	High-voltage Side Rated Voltage	KV	10
3	Low-voltage Side Rated Voltage	KV	0.4
4	Maximum operating voltage (High voltage side)	KV	12
5	Rated Frequency	Hz	50
6	Rated Capacity	KVA	150-1600
7	High-voltage Switch Heat Stable Capacity	KA	20/26
8	Low-voltage Main Circuit Breaker Rated Short-circuit Breaking Capacity	KA	35
9	Low-voltage Distribution Circuit Breaker Rated Short-circuit Breaking Capacity	KA	35
10	High-voltage Load Switch Transfer Current	A	>1500
11	1 min Power Frequency Withstand Voltage	KV	35
12	Lightning Impulse Voltage	KV	75
13	Cooling Mode	-	Oil immersed self-cooling
14	High-voltage Backup Fuse Breaking Current	KA	50
15	Breaking Current of Plug-in Fuse	KA	2.5
16	Ambient Temperature	℃	-35 ~ +40
17	Coil Allowable Temperature Rise	K	65
18	No-load Voltage Regulation	%	±5% or ±2 × 2.5%
19	Noise Level	dB	<50
20	Protection Grade of Box Shell	-	Not less than IP3X

 

Insulation Level

Rated voltage(KV)	10			0.4
	Transformer	Switch to ground and phase to phase	Between disconnectors
Power frequency withstand voltage (KV)	35	42	48	2.5
Peak value of impulse withstand voltage(KV)	75	75	85	–

 

 

 

 

Selected new S9 series transformer body, low loss, good overload capacity, strong short-circuit resistance, all fasteners are protected. The S11 series ring jointless core transformer with better performance can also be selected.

 

Capacity KVA	Voltage KV		Join group label	No-load current %			No load loss W			Impedance voltage %	Load loss
	High tension	Low pressure		S9	S10	S11	S9	S10	S11
160	10±5% or 2×2.5%	0.4	Dyn11 Yno	1.4	1.4	0.2	400	320	255	4.0	2200
200				1.3	1.3	0.2	480	380	305		2600
250				1.2	1.2	0.2	560	450	360		3050
315				1.1	1.1	0.2	670	530	425		3650
400				1.0	1.0	0.15	800	650	505		4300
500				1.0	1.0	0.15	960	750	605		5100
630				0.9	0.9	0.15	1200	910	755		6200
800				0.8	0.8	0.15	1400	1080	980		7500
1000				0.7	0.7	-	1700	1260	-	4.5	10300
1250				0.6	0.6	-	1950	-	-		12000

 

Item Name		Units	315A	630A
Rated voltage		KV	12	12
Maximum current		A	315	630
Rated frequency		Hz	50	50
Rated short-circuit closing current		kA	31.5	50
Rated short-time withstand current		kA	12.5	50
Rated short endurance time		S	2	2
Mechanical life		Second-rate	2000	2000
Lightning impulse test	Phase to phase	KV	75	75
	Isolation fracture		85	85
1min power frequency withstand voltage	Phase to phase	KA	42	42
	Isolation fracture		48	48
Rated peak withstand current		KV	31.5	50

 

Capacity	A	B	C	H	Weight KG
200kVA and below	1830	1420	820	1850	＜ 2800
250-400kVA	1830	1450	850	1980	3000-3300
500-630kVA	1830	1480	880	2070	3600-3950
800kVA	2200	1700	950	2170	4500

Note:The above is the standard size for reference.

 

Capacity	A	B	C	H	Weight KG
315kVA	2560	1600	600	1000	3050
400kVA	2560	1600	600	1000	3270
500kVA	2560	1600	600	1000	3400
630kVA	2560	1600	600	1000	3900
800kVA	2760	1600	800	1000	4200
1000kVA	2760	1950	800	1000	4800
1250kVA	2910	1950	800	1000	5400
1600kVA	2200	1700	950	2170	4500

Note:The above is the standard size for reference.