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When it becomes necessary to change potential transformer
connections inside the tank, this can be accomplished by
reaching through the handhole and changing the connection
at the potential-transformer terminal board (see Fig. 8). The
lead connection is of the quick-disconnect bayonet type, and
reconnection can be easily made by pulling the lead off the
terminal board terminal and pushing the lead receptacle onto
the desired blade. The terminal board is clearly stamped to
identify the potential transformer leads.
3.15 Voltage Regulator PT Ratio
3.15.1 Source PT Ratio Test
The regulator must be de-energized and in the Neutral position prior to performing ratio test. Instructions are written for DTR
Model 8510 single-phase tester (3-Phase TTR can also be used however, the test lead color will vary).
•
Connect the red Lead (H1) to the Source (S) bushing and the black Lead (H2) to the Source-Load (SL) bushing.
•
Open the control cabinet door, using the thumb screw, unlatch control module from door jam to access the knife
switches located in bottom left of cabinet.
•
Connect Black lead (X2) to Ground stud and the red Lead (X1) to the top terminal of the knife switch labeled
"Source".
The tested ratio value should coincide with the "Pot Ratio" - shown adjacent to the voltage setting identified with the white
pin on the nameplate. For example, if the unit was shipped connected for 7200 V, the white pin would be inserted in the hole
adjacent to 7200 V on the nameplate and the "Pot Ratio" will be 60:1 (If correct ratio is not obtained, check HV tap setting
inside the tank – refer to Step-Voltage Regulator Nameplate.
Red Lead
(H1)
connection to
Source (S)
Bushing
prolec.energy/prolecge
GEH-7299A: Installation, Operation and Maintenance Manual
for Type VR1™ Single-Phase, Step Type Regulators
Figure 8. Potential Transformer Terminal Board
Hand-Hole Opening View
Black
Lead (H2)
connection to
Source-Load
(SL) Bushing
17
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