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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Oil-immersed on Load Tap Changer

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...

Product Details

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 

image002.png image004.png image006.png
(Y connection neutral point) (Y connection neutral point with lead wire) (Y connection central bridge point) 
image008.png image010.png image012.png
(D connection central bridge point) (D connection terminal point) (Auto type terminal point)

Sample Outline Dimension Diagram 

image014.png

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

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