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• JB/T10217-2000 JB/T10217-2000 Combined transformer
• GB1094.1～2-1996 Power transformer
• GB3804-1990 3～63kV AC high-voltage load switch
• GB7251.1-1997 Low-voltage equipment in set and controllable equipment: Part I: Set equipment for model test and partial model test

Environmental conditions

• Altitude: ≤ 2000m (it is designed for the second time once it is above this scope) ;
• Scope of environmental temperature: -40℃ ~+40℃ ;
• Relative humidity: The average daily value is not above 100% and average monthly value is not above 90%;
• Earthquake intensity: 8° (Twelve-level standard in China) ;
• Outdoor air speed: Not above 50m/s; air pressure: 100kgF/m2 ;
• Sewage resistance level: Level IV sewage area ;
• Installation area: Outdoor area without fire accident, explosion danger, conductive dust and chemical corrosive gas ;
• Ice coverage thickness: 10mm.

Structural features

This series of product box is divided into front and back parts; the front belongs to the high/low-voltage operation partition. High-voltage partition is composed of the high-voltage terminal and load switch, non-load voltage regulation separate switch, inserted fuse, pressure release valve, oil temperature meter, oil level meter and oil drainage valve; low-voltage partition is composed of low-voltage terminal. The back belongs to oil filling box and heat radiator; the transformer winding, iron core, high-voltage load switch and protective fuse are installed in the oil storage tank. The box of windpower transformer is in the double-layer door sealed structure; there is no dust-proof unit in the ventilation outlet—it can effectively prevent sandstorm, rainwater and snow and realize a protection level of IP54.

Performance characteristics

• Small volume and compact structure: only approximately 1/3 of domestic box-type transformer with the same capacity;
• Whole sealing, complete insulation, insulation distance required and personal safety is reliably guaranteed;
• The transformer adopts high-quality silicon steel sheet material and through optimal electromagnetic design, both its no-load loss and load loss are lower than like products; as a result, adequate utilization of wind power is guaranteed to the largest extent;
• As to safety and high-voltage part, load switch + fuse combined apparatus are adopted so that transformer can be protected rapidly and reliably; as to low-voltage part, circuit breaker or knife fuse switch can be adopted as the master switch to configure small-capacity transformer which provides 0.4kV illumination and overhaul power consumption of box-type transformer and wind tower;
• High-temperature resistant and strong overload operation ability .

Feature and performance form of transformer

Items	Unit	Parameter value
Model		Feature and performance form of transformer
Maximum work voltage	kV	40.5
Rated frequency	Hz	50
Rated volume	kVA	80-2500
Voltage ratio	kV	38.5±2*2.5%/0.69
Connection group		D,yn11
Impedance voltage		4.5%-6.5%
Voltage regulation mode		Non-excitation separate switch
Transformer oil		45# oil in Karamay
Rated work frequency withstanding voltage in short term	kV	85kV/1min
peak lightning withstanding voltage	kV	215
Cooling mode		ONAN
Protection level of crust		Oil tank: IP68; box: IP54
Temperature increase	K	Coil: 63K; top oil: 53K
Idled current	%	0.6%
Noise level	dB	Not above 50dB

Performance form of load switch of high-voltage equipment

Items	Unit	Guaranteed value
Model		BYF1-40.5/630
Voltage level	kV	40.5
Maximum phase-to-phase voltage	kV	40.5
Maximum phase-to-ground voltage	kV	23.4
Rated work frequency withstanding voltage in short term	kV	95kV/1min
peak lightning withstanding voltage	kV	200
Rated current	A	630
Withstanding current in short term (effective value: -10 cycles)		20kV/2s
Rated connection/disconnection capacity	A	630
Resistance of main loop	μΩ	Not above150
Machinery life	T	Not less than 20000

Performance form of high-voltage fuse

Items	Unit	Guaranteed value
Model		STR20-40.5
Rated voltage	kV	40.5
Rated current	A	100
Rated frequency	Hz	50
Rated connection/disconnection capacity	kA	40
Rated current of fuse	A	Optional between 20-63A

Performance form of high-voltage lightning arrester

Items	Unit	Guaranteed value
Model		HY5WZ-51/134
Rated voltage	kV	51
Sustainable operation voltage	kV	40.8
Reference DC voltage	kV	73
Leakage current under 0.75U1mo	μA	Not above 30
Residual voltage under 8/20μS nominal discharge current	kV	Not above 134
Current of 2000μS square wave (amplitude)	A	Not less than 400
Impact withstanding current of 4/10μS large current (kV)	kV	Not less than 65
Partial discharge volume under 1.05UC		less than 14PC

Schematic diagram of typical plan