BECKWITH ELECTRIC M-3425A, Instruction Book

Page: 326 / 482

6–39
Testing – 6
59 Phase Overvoltage, 3-Phase (#1, #2, #3)
VOLTAGE INPUTS:
Configuration V1
CURRENT INPUTS:
None
TEST SETTINGS:
Pickup P Volts (5 to 180)
Time Delay D Cycles (1 to 8160)
Input Voltage Select (Phase, Positive or Negative Sequence)
Programmed Outputs Z OUT (1 to 8)
Expanded I/O (9 to 23)

NOTE
: If 59 #1 and 59 #2 have different pickup settings, it would be efficient to disable the one with the
lower setting first and test the higher setting operation. The lower setting operation could then be
tested without disabling the higher setting.
Test Setup:
1. Determine the Function 59 RMS Overvoltage settings to be tested.
2. Enter the Function 59 RMS Overvoltage settings to be tested utilizing either the HMI or IPScom ®
Communications Software.
3. Disable all other functions prior to testing. Refer to Section 4.4 System Setpoints, for details that
describe disabling/enabling functions.
4. Connect test voltage inputs as shown in Figure 6-1, Voltage Inputs: Configuration V1.
5. Set the three-phase voltages V
A
, V
B
, and V
C
to the
Nominal Voltage.
The
Nominal Voltage
value previously input to the relay is described in Section 4.2, Setup System
and should be recorded on Figure A-2, Setup System Record Form.
Pickup Test
:
1. Press and hold the
TARGET RESET
pushbutton, then slowly increase the Phase A Voltage Input
until the
59 PHASE OVERVOLTAGE
LED illuminates, or the pickup indicator illuminates on the
IPScom Function Status screen.
The voltage level of operation should be equal to
P Volts
±0.5 V or ±0.5%. When both RMS and
Line-Ground to Line-Line is selected, the accuracy is

0.8V or

0.75%
2. Release the
TARGET RESET
pushbutton.
3. Decrease the Phase A Voltage Input to
Nominal Voltage
. The
OUTPUT
LED(s) will extinguish.
4. Press the
TARGET RESET
pushbutton to reset targets.
Time Test
:
1. Connect a timer to output contacts
(Z)
so that the timer stops timing when the contacts
(Z)
close.
2. Apply (
P
+1) Volts to the Phase A (B,C) Voltage Input and start timing. The contacts will close after
D
cycles  1 cycle or  1% (DFT) or within
O
20 cycles or  1% (RMS).
3. Reduce Phase A (B,C) Voltage Input to
Nominal Voltage
.
4. Repeat Steps 2 and 3 for Phase B & C.