200kVA 33/0.4kv Grounding Earthing Transformer Auxiliary Transformer

• Customization: Available
• Application: Power, Electronic, Instrument, Rectifier
• Phase: Three
• Model NO.: SL11 200/33/0.4KV
• Cooling Method: Oil-immersed Type Transformer
• Winding Type: Two-winding Transformer
• Certification: ISO9001-2000, ISO9001
• Usage: Distribution Transformer, Earthing Transformer
• Frequency Characteristics: High Frequency
• Shape of Core: Ring
• Brand: Ville
• Test: Type Test Report
• Test Certification: Iei Transformer Test
• Transport Package: Wooden Cases
• Specification: IEC CE, ISO
• Trademark: VILLE
• Origin: Ningbo China
• HS Code: 8504220000
• Production Capacity: 3000/Year

Product Description

A grounding transformer or earthing transformer is a type of auxiliary transformer used in three-phase electric power systems to provide a ground path to either an ungrounded wye or a delta-connected system.Grounding transformers are part of an earthing system of the network. They let three-phase (delta connected) systems accommodate phase-to-neutral loads by providing a return path for current to a neutral.

Grounding transformers are typically used to:

• Provide a relatively low-impedance path to ground, thereby maintaining the system neutral at or near ground potential.
• Limit the magnitude of transient overvoltages when restriking ground faults occur.
• Provide a source of ground fault current during line-to-ground faults.
• Permit the connection of phase-to-neutral loads when desired.

Grounding transformers most commonly incorporate a single winding transformer with a zigzag winding configuration, but may also be created with a wye-delta winding transformer.Neutral grounding transformers are very common on generators in power plants and wind farms.Neutral grounding transformers are sometimes applied on high-voltage (sub-transmission) systems, such as at 33 kV, where the circuit would otherwise not have a ground; for example, if a system is fed by a delta-connected transformer. The grounding point of the transformer may be connected through a resistor or arc suppression coil to limit the fault current on the system in the event of a line-to-ground fault. 

Features:
High reliability, advanced level of performance, economic indicators and reasonable;
Using phase-shaped core of three joints, curing paint brushing the surface to reduce wear and tear and noise;
Winding structure of a new oil road design is reasonable, with the new insulation to improve the mechanical
strength and the ability to engage in short-circuit;
Tank forms, beautiful, generous.

Range of application:
It can be widely used in urban power network as well as petrochemical, metallurgical, textile and humid,
inaccessible enterprises, and mining.

33/0.4KV EARTHING TRANSFORMER
	Unit	Required	Offered
Manufacturer
Type		Outdoor, oil immersed, self-cooled, hermetically sealed and core type
Dielectric Type		Mineral Oil  (NOT Askarel nor PCBs)
Standards		IEC 60076/60354
Cooling system		ONAN
Vector Group		ZNyn11
Protection class		IP55
Insulation class		A
Size (Length x Width x Height)	mm	-
Rated Power	kVA	200
Efficiency at full load and 100% p.f	%	98
No load current	%	5.5
Rated Primary Voltage	kV	33
Rated Secondary Voltage	kV	0.4
Nominal Frequency	Hz	50
Number of phases		3
Off-load tap changer		±2 x 2.5%
Number of taps		5
Rated short circuit power	kA	25
Short circuit current (permanent)	kA	0.078
Permissible neutral current for 5sec	A	4200
Zero sequence  Current : DB	A	160
Zero sequence  Current : KB 5sec	A	1050
Zero sequence impedance	Ohm/phase	10
Test Voltages
Power frequency withstand/Induced voltage test: -High voltage winding at 200Hz	kV	70
Separate source voltage test: -High voltage winding at 60 sec -Low Voltage winding at 60 sec -Neutral winding at 60 sec	kV  kV kV	70
Impulse withstand test voltage full wave 1.2/50micro sec. High voltage winding  Low voltage winding Neutral winding	kV kV kV	170 - 95
Short-circuit impedance Voltage Ucc	%	4% (±10%)
Non load losses P0	W	≤145
Load Losses Pcc	W	≤1750
Noise level Lwa	dB	<50
Maximum ambient temperature	^oC C	40
Tank type		Sealed tank with bolted cover
Maximum temperature rise oil/windings	^oC	≤50^oC/55^oC
Tests		Winding resistance, voltage ratio and phase displacement, no-load loss & current, load-loss and short circuit impedance, induced and separate source voltage withstand test.
Color		RAL7033
Spare parts		Oil gauge with thermometer, repair paint, and silica gel for breather
Guarantee		1 year from the date of taking over certificate of the project.

Reference:





Our Performance:

1.	Pre sale service
a.	make technical solution
b.	send quotation, technical data sheet and drawing
c.	prepare power transmission plan, testing plan,and shipment plan
2.	In sale service
a.	supervise the manufacturing schedule totally in accordance with the plan
b.	send photos to customer during every manufacturing process(hold point)
c.	inform the customer one week before testinng.
3.	After sale service
a.	installation and commissioning, training the workers
b.	quick response within 12 hours any time
c.	provide 12 months gurantee period normally.

 

Ville Electric Company will keep up with the century, the epoch,

Sincerely look forward to your cooperation and win-win!

Create brilliant!