Pre-Installed Underground Box Transformer

We are pleased to introduce the YBD-12 Series Pre-Installed Underground Box Transformer, a product meticulously designed and developed in response to the demands of urban and rural modernization, focusing on beautifying streetscapes and optimizing space utilization. This innovation draws upon the ecological design concept of gradually burying transformers underground, widely adopted in developed countries such as Europe, the United States, and Japan. It addresses the challenge posed by traditional box-type substations, which often occupy prime ground in urban areas.

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Description
Parameter

The YBD-12 Series Pre-Installed Underground Box Transformer is a new generation of complete power equipment, primarily composed of two integral parts: an underground transformer and an advertising light box type outdoor switchgear. This hybrid structure cleverly integrates power infrastructure with urban landscapes, aiming to meet the increasingly stringent requirements for power equipment in urban planning, highways, and public facility construction.
The underground transformer, a new compact substation unit, integrates the transformer, high-voltage load switch, and fuses into a single assembly. It is installed in an underground pit, thereby not occupying surface space and notably capable of being submerged in water for a period of time, demonstrating exceptional environmental adaptability. Its rated voltage includes high voltage 6/10kV and low voltage 0.4kV, with a capacity range from 30kVA to 1000kVA. It offers options for S11 series silicon steel sheet cores or S15 series amorphous alloy cores to meet varying loss requirements. The underground component features an enclosure protection level of IP68, ensuring reliable operation even in harsh conditions.
Conversely, the advertising light box type outdoor switchgear ingeniously combines the functionalities of billboards and outdoor switchgear, installed above ground. Its interior houses the outdoor high and low voltage distribution cabinet, while its two sides are designed as advertising light boxes with visual effects. This design transforms power facilities from mere functional units into integral parts of the urban landscape. The high-voltage switchgear segment is rated at 12kV, with a rated current of 630A, and boasts a rated short-time withstand current of 20kA/2s and a rated peak withstand current of 50kA. Its power frequency withstand voltage to ground/break is 42/48kV (1 min), and lightning impulse withstand voltage is 75/85kV. The low-voltage switchgear operates at a rated voltage of 400V, with main road rated currents ranging from 100A to 2000A, and rated short-time withstand currents up to 15kA or 30kA, both featuring an IP34 protection level.
A key advantage of this product is its adherence to urban ecological design principles. Through its miniaturized and underground installation, it significantly saves land area and effectively enhances the surrounding environment's aesthetics. It is particularly well-suited for locations with high demands on space and landscape, such as urban traffic arteries, residential areas, airports, stations, and highways, and is poised to become a leading trend in urban distribution network transformation. For installation, we provide guidelines for pre-digging the soil and compacting the base, recommending pre-embedding steel plates or bolts to secure the unit. After installation, the soil is backfilled, and turf can be planted, further integrating the unit seamlessly into its surroundings.

Rated capacity	Voltage combination and tapping range			Connection group number	No-cut loss(kW)	Negative cut loss (kW)	No-cut current(%)	Short circuit impedance(%)
Rated capacity	High voltage(kV)	High voltage tapping range	Low voltage(kV)	Connection group number	No-cut loss(kW)	Negative cut loss (kW)	No-cut current(%)	Short circuit impedance(%)
50	6 6.3 10 10.5 11	±5% ±2×2.5%	0.4	Y,yno D,ynll	0.14	0.78	1.3	4
63					0.16	1.04	1.2
80					0.18	1.20	1.0
100					0.20	1.43	1.0
125					0.24	1.71	0.9
160					0.29	2.15	0.8
200					0.35	2.55	0.7
250					0.40	3.00	0.7
315					0.48	3.55	0.6
400					0.56	4.20	0.6
500					0.68	5.00	0.5	4.5
630					0.84	6.00	0.5
800					0.98	7.68	0.5
1000					1.19	9.78	0.4
1250					1.37	11.10	0.4
1600					1.65	13.20	0.4

Technical Data

Unit	Item	Unit	Parameter
High voltage unit	Product	Withdrawable load switch
	Protective fuse	Full range protection of small fuses
	Rated voltage	kV	12
	Rated frequency	Hz	50
	Rated power frequency withstand voltage phase to phase/to ground	kV	42/48
	Rated lightning impulse withstand voltage phase to phase/to ground	kV	75/85
	Rated current	A	630
	Rated short-time withstand current	kA	20(3s)
	Rated peak withstand current	kA	50
Low voltage unit	Product	Breaker
	Rated voltage	V	400
	Main circuit rated current	A	100~1000A
	Feedback circui	A	50~630
	Number of feedback circuits	line	3~4
	Compensation capacity	kvar	30~120
Transformer unit	Product	Dry type transformer
	Rated capacity	kVA	100~400
	Rated voltage ratio	kV	10/0.4
	Tap range		±2×2.5% Or ±5%
	Connection group		D,yn11 Or Y,yn0
Box	Installation method		Directly placed in the house
	Protection level		Ip32
	Dimensions (width L×depth W×height H)	mm	≤1350×1400×2200