TECHNICAL SPECIFICATIONS
Page 65 of 67
Total Run Time
Accuracy: ±2%.
Current Unbalance Alarm and Trip
Method: Unbalance = 100 * (Negative Sequence Current / Positive Sequence Current) [%]
If Motor Load < 100% then multiply by * (Motor Load / 100)
This is to prevent nuisance tripping at low current levels.
Level 1
Threshold Unbalance Level 1: 50% of Unbal Current setting ± 2%.
Alarm (fixed) time delay: 1.0 ± 0.5 Sec.
Level 2 Curves
Threshold Unbalance Level 2: Unbal Current setting ± 2%.
Trip time accuracy: ± 1 second up to 10 seconds.
± 1 second +/- 2% above 10 seconds.
Fault Time Delays
Accuracy: ±0.5 Sec. or ±2% of time, which ever is greater, for all but the above mentioned faults and
the following exceptions:
* Overcurrent Level 2: When adjusted to 0 >>> 60 ms +/- 20 ms. -0.1/+0.2 Sec. up to 1
Sec.
* Ground fault trip: -0.1/+0.2 Sec. for less than 1 Sec. delay.
Relays Contacts
Rated load: 8A/250 VAC 1800VA.
Maximum voltage: 250VAC.
Dielectric Strength
1500 VAC, for 1 minute, Between Ground (terminal 63) and:
* Current inputs. * Auxiliary power supply inputs
* Voltage inputs. * Control terminals
Power and Reactive Power Measurements
Method: True RMS over three phase voltages and currents.
Range : 0.1 KW - 30MW (0.1 KVAR - 30 MVAR)
Full Scale : 30MW (30 MVAR)
Resolution : 0.1 KW below 1 MW, 0.01 MW above 1 MW.
Accuracy : For V ≥
90 * VT Primary / VT Secondary & Power factor ≥ 0.5, with three phase voltages.
Two Ranges : 1. For (10% < I ≤ 150%) of "C/T" primary, accuracy is :
± (2% + 0.01 * "C/T" Primary/ Motor FLC.) of motor rated Power
2. For ( I ≥ 150%) of "C/T" primary, accuracy is :
± 7% of the display reading
Power Factor
Method: Ratio between total power (P) to total apparent power (VA).
Range : 0.0 - 1.0 leading / lagging.
Resolution : 0.001
Accuracy : For V ≥ 90 * VT Primary / VT Secondary & I ≥ 50% of "C/T" Primary & Power factor ≥ 0.7
it is ± 0.03
Ambient Temperature
0°C to +50°C
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