30° phase shift compensation adjustment procedure – Basler Electric BE1-87T User Manual

Page 67

9171300990 Rev V

BE1-87T Installation

4-25

CAUTION

Assigning 30° Phase Shift Compensation requires disassembly of the relay,

and must be done when the relay has been taken out of service. Access to the

30° Phase Shift jumpers requires the removal of the Analog #2 Board, shown

in Figure 4-27. To avoid personal injury or equipment damage, do

NOT

proceed unless thoroughly familiar with the instructions in the sections on

Relay Operating Precautions and Relay Disassembly: Precautions.

The position of a set of movable jumpers on Analog Board #2 determines the state of the internal

compensation. To gain access to these jumpers, it is necessary to remove Analog Board #2. Refer to the

topic RELAY DISASSEMBLY for instructions on gaining access to the circuit board then adjust the

jumpers shown in Figure 4-27 as follows:

30° Phase Shift Compensation Adjustment Procedure

•

In cases where no phase shift is wanted, all three jumpers (

B, and

C) shown in Figure 4-

27 are in the

WYE-WYE position. (Relays are shipped with all jumpers in this position.)

•

If one of the inputs requires a shift in phase, the jumpers for all three phases are moved as

follows:

1. The

∆

2 position develops A-B, B-C, C-A.

2. The

∆

1 position develops A-C, B-A, C-B.

NOTE

The result of each of these vector differences has a magnitude of the square

root of three times each component.

The internal phase shift compensation is performed electronically as shown in the chart of Figure 4-27.

The internal compensation can apply to any power transformer with any combination of wye, delta, or

autotransformer winding connections.
A procedure to check the differential balance is described later in this section, Checking the Relay

Settings and System Inputs.