Oil-immersed on Load Tap Changer

Oil-immersed O n L oad T ap C hanger On Load Tap Changers (OLTC) are just what the name implies. They are used to vary the turns ratio while the transformer is in service to maintain a relatively constant output voltage. In most cases they are located in the lower voltage side of the...

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Product Introduction

Oil-immersed On Load Tap Changer
On Load Tap Changers (OLTC) are just what the name implies. They are used to vary the turns ratio while the transformer is in service to maintain a relatively constant output voltage. In most cases they are located in the lower voltage side of the transformer. They are severe-duty switching systems, requiring arcing contacts and bypass contacts to ensure continuity while switching from one tap to another. The voltage change from one tap to the next is typically less than 1%, with many (30+) taps to provide a reasonable range of operation. OLTC's usually operate automatically to compensate for changes in supply voltage and line sag on the secondary side as load increases.

Off Load (or No Load) Tap Changers (NLTC) are not designed to be operated unless both sides of the transformer are deenergized. The operating handle is padlocked to prevent damage due to inadvertent operation. NLTC's are much lighter construction, since they don't need to make and break any voltage, and are usually installed in the higher voltage side. NLTC's consist of a few, widely spaced taps. Most have 5 taps, at +5%, +2.5%, 0, -2.5% & -5% of nominal voltage.

For transformers with both an OLTC and a NLTC, the NLTC acts as a "coarse adjustment", providing a centerpoint around which the "fine adjustment" OLTC operates.

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）
Serial number	Model No.	(A) Rated current	(v) Rated voltage	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

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