On Load Tap-changer

Product Detail

On Load Tap-Changer
Tap changers exist in two primary types, no load tap changers (NLTC) which must be de-energized before the turn ratio is adjusted and on load tap changers (OLTC) which may adjust their turn ratio during operation. The tap selection on any tap changer may be made via an automatic system, as is often the case for OLTC, or a manual tap changer, which is more common for NLTC. Additionally, tap changers are often placed on the high voltage (low current) transformer winding for easy access and to minimize the current load during operation.

For many power transformer applications, a supply interruption during a tap change is unacceptable, and the transformer is often fitted with a more expensive and complex on load tap changing (OLTC, sometimes Load Tap Changer, LTC) mechanism. On load tap changers may be generally classified as either mechanical, electronically assisted, or fully electronic.

An On load tap changer (OLTC), also known as under- load tap changer (ULTC). Tap changers typically use numerous tap selector switches which may not be switched under load, broken into even and odd banks, and switch between the banks with a heavy-duty diverter switch which can switch between them under load. The result operates like a dual-clutch transmission, with the tap selector switches taking the place of the gearbox and the diverter switch taking the place of the clutch.

These transformer tap-changers are applying to such oil-immersed power transformer of 50Hz, under 35KV rated voltage and 400A rated current. Online oil filter function will extend the service life and maintenance time of tap changer.

Model Explanation
 SY?Z(Z) - ?/?-?L
    S : three-phase
    Y : on load
    ?: voltage connection model
    Z : adopting resistance transit
    Z : direct switch
    ?: rated current
    ?: rated voltage
    ?: number of voltage regulation grades
    L : online oil filter

Main Technical Data

Application Scope	Oil-immersed Distribution Transformer
Connection Model	SYXZZ : three phase Y connection neutral point linear voltage regulation SYJZZ : three phase central point bridge voltage regulation SYTZZ : three phase any connection linear voltage regulation
Three-phase Max. Rated Current	400A
Max. Rated Voltage	600V
Max.Voltage of Device Um	40.5KV
Max.Tap Positions	17 or others

Connection Model Shows as Following 

?	?	?
(Y connection neutral point)	(Y connection neutral point with lead wire)	(Y connection central bridge point)
?	?	?
(D connection central bridge point)	(D connection terminal point)	(Auto type terminal point)

Sample Outline Dimension Diagram 



Sample Model Parameters

Serial number	Model No.	(A) Rated current	(v) Rated voltage	Installation dimension(mm)
				H	H1	H2	H3	Md
1	SYXZZ 50/10 -3~5	50	10	615	305	120	60	M8
2	SYXZZ 100/10-5~9	100	10	682	350	125	66	M8
3	SYJZZ 100/10-5~7	100	10	750	440	125	100	M8
4	SYJZZ 200/35-5~9	200	35	1500	190	170	715	M12
5	SYJZZ 300/35-5~9	300	35	1500	190	170	715	M14
6	SYJZZ 400/35-5~9	400	35	1700	220	235	910	M16