BECKWITH ELECTRIC Syncrocloser M-3410A, Instruction Book

Page: 183 / 225

M-3410A Instruction Book
5–22
51V Inverse Time Overcurrent with Voltage Control or Voltage Restraint
VOLTAGE INPUTS : V1
CURRENT INPUTS : C1
TEST SETTINGS : Pickup P Amps (0.50 to 12.00)
1 Amp CT Rating (0.10 to 2.40)
Standard Inverse Time Curves: 1
Curve C (1 to 4)
Time Dial TD (0.5 to 11.0)
IEC Inverse Time Curves: 1
IEC Curve C (5 to 8)
IEC Time Dial TD (0.05 to 1.10)
Programmed Outputs Z Output (1 or 2)
1 Either a standard curve or an IEC curve must be selected.
1. Disable functions as shown. Refer to Section 3.2, Setpoints and Time Settings, for procedures.
2. Confirm settings to be tested.
3. Connect current inputs in Configuration C1 designated previously. See Section 5.1, Equipment/
Test Setup for configuration.
4. Refer to Appendix D. Calculate test times for levels represented on the graphs. It is suggested
that 4 or 5 test levels be chosen.
5. Time Test : With output contacts connected to the timer, apply current used in calculations
from step 4 and start timing. The operating time will be
&
3 cycles or
&
10%* of calculated time
(for M=2 and above). Repeat this step for each test level chosen. The tested points verify the
operation of this function. The following equations can be used for IEC curves:
Curve 5
t=TD x
0.14
M
0.02
- 1
[
]
Curve 6
t=TD x
13.5
M - 1
[
]
Curve 7
t=TD x
80
M
2
- 1
[
]
Curve 8
t=TD x
120
M - 1
[
]
IEC Class A
Standard Inverse
IEC Class B
Very Inverse
IEC Class C
Extremely Inverse
IEC Class D
Long Time Inverse
t = time in seconds TD = Time Dial setting M = current in multiples of pickup
6. Voltage Control Test : Input voltages at least 5% under the Voltage Control setting V.
a. With output contacts connected to the timer, apply current equal to the chosen test level
calculated in step 4 on phase A, and start timing. The operating time will be as read from the
appropriate Inverse Curve Family and
K (Time Dial) setting. Repeat this step for all test levels
chosen. The tested points verify the operating times of the function.
b. The input voltage may be increased over the Voltage Control setting by at least 0.5% or
& 0.5 V, and the function will drop out.
7. Voltage Restraint Test (see Figure 3-44): Input Nominal Voltages and test as in step 6 above
(same current input values). Repeat step 6 above with reduced input voltage values and
current reduced by an equivalent percentage as the voltage reduction. This test should be
conducted with balanced 3-phase voltages.
8. If testing is complete, enable any functions disabled for this test. If further testing is desired,
check the proper functions to disable for the next test and continue from this point.
*The specified timing accuracy is applicable for currents above three times the pickup value.