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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

On Load Tap-changer

On Load Tap-changer

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...

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Product Details

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 

image002.pngimage004.pngimage006.png
(Y connection neutral point)(Y connection neutral point with lead wire)(Y connection central bridge point)
image008.pngimage010.pngimage012.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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