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

 

Engineered for reliable medium-load distribution, this 100 kVA pad-mounted transformer offers copper or aluminum coil options and supports both 50 Hz and 60 Hz operation. Its compact footprint reduces site space requirements.

 

 

 

 

ZBW-12/0.4 pre-installed substation is a type of American-style prefabricated box-type substation. As an integrated prefabricated product, it combines the cable of the distribution network power supply unit, high-voltage control and protection devices, substation components, and power distribution equipment. It is widely used in urban and rural power distribution networks.

The product is equipped with high-voltage load switches and high-voltage fuses in the transformer oil tank, and has two structural forms: integrated transformer tank and separate transformer tank. The tank adopts a fully sealed structure, and is equipped with oil temperature gauges, oil level gauges, pressure gauges, pressure release valves, drain valves, and other components to monitor the operation status of the transformer.

According to the power supply mode, the product is classified into ring network type and terminal type. To make this product more suitable for the actual requirements of China's power grid, our company has also launched plug-type fuses, which do not affect the performance of transformer oil.

Based on the complexity of low-voltage outgoing circuits, ZBW-12/0.4 products are divided into three cabinet types: standard type, enhanced type, and comprehensive type. This allows users and design units to make more flexible and cost-effective selections.

 

 

 

 

• 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).
   

 

 

 

 

1. Cooling condition: Air self-cooling
2. Operating environment:
The outdoor ambient temperature shall not be higher than 40℃ or lower than -45℃; the altitude shall not exceed 1000m; the monthly average temperature shall not exceed 30℃; the annual average temperature shall not exceed 20℃.
At 25℃, the relative humidity of the air shall not exceed 95%, and the monthly average relative humidity shall not exceed 90%.
Horizontal acceleration shall not exceed 0.3g; vertical acceleration shall not exceed 0.15g.
The installation environment shall be free from obvious pollution, as well as explosive or corrosive gases and dust. The installation site shall be free from violent vibration and impact, and the equipment shall be installed on a cement platform or other flat, solid platforms.
3. Note: If the intended use conditions deviate from the above technical specifications, the user shall negotiate with the company.

 

 

 

 

1. Compact structure and small size: Its volume is only about 1/3 to 1/5 of that of domestic European-style box-type substations with the same capacity, greatly reducing the floor area. 

2. Fully sealed and fully insulated structure: It requires no insulation distance and provides reliable personal safety protection.

3. Flexible high-voltage connection and power supply mode: The high-voltage connection can be used for both ring network and terminal connections, featuring flexible power supply mode and high reliability. 

4. Excellent transformer performance: The transformer has excellent performance, with low loss, low noise, and low temperature rise. It also has strong overload capacity, as well as short-circuit and impact resistance.

5. Adaptable to low-voltage outgoing requirements: It can meet the requirements of various low-voltage outgoing circuits, and can be selected according to existing schemes or customized as required. 

6. Two types of cable connections available: There are two options for cable connections: cable head plugs and 200A/600A elbow-type "T"-shaped fixed cable joints. A fully insulated zinc oxide arrester can be configured; the 200A cable head supports live plugging and serves as an isolating switch.

 

 

 

1. The product features small size, a compact structure, and easy installation.
2. It can be used for both ring network and terminal applications, and provides reliable personal safety protection.
3. The product has low loss, low noise, and superior performance.
4. The cabinet adopts an anti-theft structure.
5. It also has a low temperature rise and strong overload capacity.
 

 

 

 

 

● Foundation Bearing Capacity and Protection
The foundation bearing capacity shall be not less than 100 kPa.

-If the foundation is located in highlands, external drainage systems shall be provided around it.

-The foundation shall be built with red brick cement mortar, and both inner and outer walls shall be plastered with 20mm-thick 1:2 cement mortar mixed with 3% waterproofing agent to enhance waterproofing.

-The concrete foundation surface shall be flat, and after installation of the prefabricated substation, the surrounding foundation shall be sealed with cement.

 

● Structure and Embedded Parts

-The bottom of the cable chamber shall be slightly inclined toward the water collection pipe to prevent water accumulation.

-A diamond-shaped expanded steel mesh (150×300 frame, 10×20 mesh size) shall be welded inside the louver frame, with reinforcement ribs embedded into the wall for enhanced strength.

-Grounding bars and cable fixing brackets shall be pre-embedded, and their shapes and positions shall be determined according to actual site conditions.

--The positions of incoming and outgoing cable holes shall also be determined as required on-site.

 

● Operation and Space

After installation of the prefabricated transformer substation, an operation clearance of not less than 1.5m shall be reserved in front of the switch to ensure safe operation and maintenance.

 

● Grounding System

- The grounding trunk shall be led out from the cable trench, and may be arranged around the ring main unit or extended to the grounding electrode from one side.

- The grounding grid shall be constructed with Φ12mm galvanized round steel or 30×4mm galvanized flat steel.

- The grounding resistance shall be ≤4Ω, in compliance with the requirements of the power authority.

 

● Construction Standards and Flexibility

-Foundation construction shall comply with JGJ/T16-92 "Code for Electrical Design of Civil Buildings".

-The dimensions shown in the drawings are recommended values. Cable wells can be arranged in three or four directions according to site conditions to meet different incoming line requirements.
 

 

 

 

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.