Pad Mounted Transformer

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Pad Mounted Transformer

YB27 series Prefabricated transformer substation is our company made Pad mounted transformer. It is an important equipment in the cable distribution network. It is a kind of complete prefabricated product with high voltage control, protection, power transformation and power distribution, It is widely used in 7.2~40.5kV electric power distribution system, widely used in the urban and rural distribution network . This equipment complies with the requirements of standard IEC61330 etc.

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product details
Substation Structure Characteristic

Product description

The product equipped the HV load switch and HV fuse in transformer oil .It has common box or separate box with transformer body. Oil tank is enclosed sealed with oil temperature gauge, oil level indicator, pressure gauge , pressure relief valve ,drain oil valve etc to monitor the transformer working conditions.The product has loop feed ,radial feed & power supply type.In order to make this product more suitable for the actual requirements of power grid , we have also introduced plug-in type dry type fuse which fusing do not affect the transformer oil. According to the complexity of low voltage outgoing requirements,YB27 enclosure has standard type, intensive and comprehensive type to make user choice more economic & flexible.

Model

Service conditions

1.Ambient air temperature: -30℃~+50℃
2.Altitude : Maximum installation altitude: 2500m
3.Outdoor wind speed is not more than 34m/s;
4.Relative humidity: daily average value ≤95%, the monthly average value ≤ 90%;
5.Inclination of installation site : not more than 3 °;
6.Installation site: no explosion danger, serious pollution, chemical corrosion , severe vibration

Products advantage:

1.Compact structure, small volume, is only about the 1/3 – 1/5 of the same capacity european type substation, which greatly reduce the occupation area
2.Fully sealed and fully insulated structure, no need insulation distance .
3.The wiring connection of high voltage can be used in loop feed and radial feed. Power supply method is flexible and reliable.
4.Excellent performance; low consumption, low noise, low temperature –rising, high overload, anti short-circuit, high impact resistance, reliable protection of personal safety
5.Meet all kinds of low voltage outgoing requirements .
6.Cable head has 200A elbow plug & 630A “T” shape fixed type. All insulated Zinc Oxide lightning arrester can be configured. 200A cable head can be plugged in with load, also can be acted as isolation switch.

Products structure:

1. Plug-in fuse
2. Pressure gauge
3. Pressure relief valve
4. Oil level indicator
5. Oil temperature gauge
6. Load break switch
7. High voltage cable connector
8. Off load tap changer
9. Grounding points
10. Drain valve
11. Low voltage switchgear

Technical parameter

	Item	Unit	Parameter
High Voltage Unit	Rated frequency	Hz	50/60
	Rated Voltage	kV	11	13.8、15	20、22	30,33,36
	Max service voltage	kV	12	17.5	24	40.5
	Rated current	A	400、630、1250、1600、2000、 2500
	transformer current	A	400~2500

	1min power frequency withstand voltage to earth and phase to phase /Fracture	kV	42/48	48/55	55/65	85/95
	BIL: to earth and phase to phase /Fracture	kV	75/85	90/105	125/150	170/185
	Rated short circuit breaking current	kA	25、31.5、40
Transformer Unit	Rated Voltage	kV	11、13.8、15、20、22、30、33、36
	Rated Capacity	kVA	160~1250
	Tap ranging	%	+/-2x2.5%、+/-5%
	Vector Group		Yyn0、Dyn11
	Impedance	%	4、4.5、6、8
Low Voltage Unit	Rated Voltage	V	220、400、690、800
	Main circuit rated current	A	400~2500
	Branch current	A	63~1250
Enclosure	Protection Level		HV Room:IP44 Transformer Room:IP44 LV Room:IP44
	Noise level	dB	≤50

Structure characteristics

The enclosure structure is made of channel steel and angle steel which has higher mechanical strength. The enclosure is made of aluminum alloy plate ,its face is even and smooth . The product is elegant appearance with better anti-erosion. The foundation of substation is higher 300- 600 mm than ground. All the doors are opened outward with angle more than 90°. The substation has handle, dark latch and dormant lock with waterproof anti-blocking and anti rust.
The body is whole enclosed against theft to ensure the working under a common air temperature, the temperature of all electrical devices do not be more than the max. allowed temperature of itself. It is equipped with enough natural vents and insulation measures.The prefabricated transformer substation is equipped with special grounding conductor .On the grounding conductor ,there has terminals to connect with ground net .Its number is more than two pieces and has obvious grounding mark. The ground terminal is copper bolt with diameter more than 12mm. The grounding conductor adopts copper strip which current density can not be more than 200A/mm, the cross section is more than 30mm , to ensure that the flow through the maximum short-circuit current does not overheat or affect the safety of the surrounding objects. Dynamic and thermal steady current of the special grounding conductor should be equipped with grounding methods of H.V. power distribution devices.

Transformer performance parameter

Pad mounted transformer -Transformer parameter

No	Capacity	Rated voltage		Tap Range (%)	No load current (%)		Losses(W)				Impedance (%)
	kVA	HV (kV)	LV (kV)		S9	S11	No load		Load
	kVA	HV (kV)	LV (kV)		S9	S11	S9	S11	S9	S11
1	30	6.6 7.2 11 13.815 20 22 30 33 36	0.4 (0.69)	+/-5 ±2* 2.5%	2.2	2.0	130		600		4
2	50				2.0	1.8	170		870
3	63				1.9	1.5	200		1040
4	80				1.7	1.2	250		1250
5	100				1.6	1.1	290		1500
6	125				1.5	1.0	340	270	1800
7	160				1.4	1.0	400	310	2200
8	200				1.4	0.8	480	375	2600
9	250				1.2	0.8	560	400	3050	3000
10	315				1.1	0.7	670	475	3650	3600
11	400				1.0	0.7	800	570	4300	4200
12	500				1.0	0.6	960	680	5100	5000
13	630				0.9	0.6	1200	800	6200	6000	4.5%
14	800				0.8	0.6	1400	1120	7500	7400
15	1000				0.7	0.5	1700	1320	10300	9860
16	1250				0.6	0.5	1950	1360	12800	12000
17	1600				0.6	0.5	2400	1840	14500	14000

Note:

a. According to customer requirements, the high voltage tap range of transformer can be designed to be + 2 * 2.5%.
b. According to customer requirements, the transformer low voltage can be designed as 0.69kV

Load break switch parameter

Rated Current (A)	Rated Voltage (kV)	BIL (kV)	Power frequecny Withstand voltage (1min.kV)	Rated short - time withstand current (kA/S)	Short circuit making current (kA)	Rated withstand current (peak) (kA)	Load Operation times (kA)	Mechanical Operation times
315	11	75	42	12.5/2	31.5	31.5	100	2000
630	11	75	42	16/4	40	40	100	3000

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