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Liaoning Jinli Electric Power Electrical Appliance Co.,Ltd

Central Point on Load Tap Changer

Central Point on Load Tap Changer

Central Point On Load Tap Changer On load Tap Changer (OLTC) is used with higher capacity transformers where HT side voltage variation is frequent and a nearly constant LT is required. OLTC is fitted with the transformer itself. Multiple tappings from HV windings are brought to the OLTC chamber...

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Product Details

Central Point On Load Tap Changer

On load Tap Changer (OLTC) is used with higher capacity transformers where HT side voltage variation is frequent and a nearly constant LT is required. OLTC is fitted with the transformer itself. Multiple tappings from HV windings are brought to the OLTC chamber and contacted to fixed contacts. Moving contacts rotates with the help of rotating mechanism having a spindle. This spindle can be rotated manually as well as electrically with a motor.

Motor is connected in such a way that it can rotate in both the directions so as to rotate the OLTC contacts in clockwise and antilock-wise direction. Two push buttons are fitted on the LCP (local control panel) to rotate the motor and hence the OLTC contacts in clockwise and anti-clockwise direction. This movement of contacts thus controls the output LV voltage of the transformer. So rotating of OLTC contacts with spindle or push buttons in this way is a manual process. In case this process of rotating the OLTC contacts and hence controlling the LV side voltage is to be done automatically then a RTCC (Remote Tap Changer Controller) is installed with the transformer HT Panel. The RTCC sends signals to LCP and LCP in turn rotates the motor as per the signals received from the RTCC

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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