MicroLogic 5.0P & 6.0P Trip Units with Power Metering
Protection Settings
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1—Test lamp and indication reset 2—Indication of tripping cause 3—High resolution screen 4—Measurement display 5—Maintenance indicators 6—Protection settings 7—Navigation buttons 8—Overload signal (LED) 9—Long-time rating plug screw 10—Long-time current setting and tripping delay 11—Short-time pickup and tripping delay 12—Instantaneous pickup 13—Hole for settings lockout pin 14—Electronic push-to-trip 15—Ground-fault pickup and tripping delay 16—Test connector |
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MicroLogic 6.0P Trip Unit |
The adjustable protection functions of the 5.0P and 6.0P trip units are identical to those of MicroLogic A trip unit (overloads, short circuits, equipment ground-fault protection); see MicroLogic 2.0A, 3.0A, 5.0A, & 6.0A Trip Units with Ammeter.
These units also feature:
Fine adjustment: Within the range below the rotary switch setting, fine adjustments of pickups/delays in steps of 1 A/s (except for short-time and ground-fault) are possible on the keypad or remotely by the communication network.
Inverse definite minimum time lag (IDMTL) setting: Coordination with fuse-type or medium-voltage protection systems is optimized by adjusting the long-time delay curve around 6 x Ir axis. This setting provides better coordination with certain loads.
Neutral protection: On three-pole circuit breakers, neutral protection may be set using the keypad or remotely using the communication network to one of four positions:
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OFF
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1/2N (1/2 x In)
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1N (1 x In)
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2N (2 x In)
Configuring Alarms and Other Protection Functions
When the cover is closed, the keypad may no longer be used to change the protection settings, but it still provides access to the displays for measurements, histories, indicators, etc. Depending on the thresholds and time delays set, the MicroLogic P trip unit monitors current, voltage, power, frequency, and phase sequence. Each threshold overrun may be signalled remotely via the communication network.
Each threshold overrun may be combined with tripping (protection) or an indication carried out by an optional M2C/M6C programmable contact (alarm), or both (protection and alarm).
Maintenance Record
The maintenance record can be consulted using a service interface, a full-function test kit, or remotely via the communication network. It can be used as an aid in troubleshooting and to assist scheduling for device maintenance operations.
Recorded indications include:
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Highest current measured
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Operation counter (both cumulative total and total since last reset)
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Number of test kit connections
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Number of trips in operating mode
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Contact wear (MasterPacT NW only)
Load Shedding and Reconnection Parameters
Load shedding and reconnection parameters can be set according to the power or the current flowing through the circuit breaker. Load shedding is carried out by a remote computer via the communication network or by an M2C or M6C programmable contact.
Indication Option via Programmable Contacts
The M2C (two contacts) and M6C (six contacts) programmable contacts may be used to signal threshold overruns or status changes. They can be programmed using the keypad on the MicroLogic P and H trip units or remotely using the communication network. These contacts are required to obtain data from the protective relay functions on Type P and Type H trip units.
MicroLogic 5.0P and 6.0P Trip Unit Settings
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Long-Time (RMS) Protection |
Current Setting (A) |
Ir = ln x... |
IEC: |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
0.95 |
0.98 |
1 |
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Ir = ln x... |
UL/ANSI: |
0.4 |
0.45 |
0.5 |
0.6 |
0.63 |
0.7 |
0.8 |
0.9 |
1 |
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Other ranges are available by changing rating plug |
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Time Delay (s) |
tr at 1.5 x Ir |
12.5 |
25 |
50 |
100 |
200 |
300 |
400 |
500 |
600 |
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tr at 6 x Ir |
0.5 |
1 |
2 |
4 |
8 |
12 |
16 |
20 |
24 |
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tr at 7.2 x Ir |
0.34 |
0.69 |
1.38 |
2.7 |
5.5 |
8.3 |
11 |
13.8 |
16.6 |
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IDMTL Setting |
Curve slope |
SIT |
VIT |
EIT |
HV Fuse |
DT |
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Thermal Imaging |
20 minutes before or after tripping |
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Short-Time (RMS) Protection |
Current Setting
(A) |
lsd = Ir x... |
1.5 |
2 |
2.5 |
3 |
4 |
5 |
6 |
8 |
10 |
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Time Delay (s) |
Settings |
I2t OFF |
0 |
0.1 |
0.2 |
0.3 |
0.4 |
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I2t ON |
0.1 |
0.2 |
0.3 |
0.4 |
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tsd |
Min. trip time (ms) |
20 |
80 |
140 |
230 |
350 |
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Max. trip time (ms) |
80 |
140 |
200 |
320 |
500 |
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Instantaneous Protection |
Current Setting
(A) |
Ii = In x... |
2 |
3 |
4 |
6 |
8 |
10 |
12 |
15 |
off |
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MicroLogic 6.0P Trip Unit Ground-Fault Setting
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Ground-Fault Pickup (A) |
Ig = ln x... |
A |
B |
C |
D |
E |
F |
G |
H |
J |
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ln ≤ 400 A |
0.3 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1 |
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400 A < ln ≤ 1200 A |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1 |
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ln > 1200 A |
500 |
640 |
720 |
800 |
880 |
960 |
1040 |
1120 |
1200 |
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Time
Delay (s) |
Settings |
I2t OFF |
0.1 |
0.2 |
0.3 |
0.4 |
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I2t ON |
0.1 |
0.2 |
0.3 |
0.4 |
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tg |
Min. trip time (ms) |
20 |
80 |
140 |
230 |
350 |
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Max. trip time (ms) |
80 |
140 |
200 |
320 |
500 |
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Settings for Alarms for Other Protection Functions for MicroLogic 5.0P and 6.0P Trip Units
| Threshold | Time Delay | |||
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Current |
Current Imbalance |
0.05 to 0.6 x Imax |
1 to 40 s |
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Maximum Current |
Imax: Ia, Ib, Ic, In, Ig |
0.2 to 1.0 x In |
15 to 1500 s |
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Voltage |
Voltage Imbalance |
0.02 to 0.3 x Vn |
1 to 40 s |
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Minimum Voltage |
Vmin |
100 to 725 V (phase total) |
0.25 to 0.5 s |
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Maximum Voltage |
Vmax |
100 to 1200 V (between phases) |
0.20 to 5.0 s |
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Power |
Maximum Power |
Pmax |
5 to 500 kW |
0.2 to 20 s |
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Reverse Power |
Pr |
0.02 to 0.2 x Pn |
0.5 to 20 s |
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Frequency |
Minimum Frequency |
Fmin |
45 to 65 Hz |
0.2 to 5 s |
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Maximum Frequency |
Fmax |
45 to 540 Hz |
0.2 to 5 s |
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Phase |
Sequence |
DØ |
ØA-ØB-ØC or ØA-ØC-ØB |
Instantaneous |
Load-Shedding Settings for Current and Power Metering for MicroLogic 5.0P and 6.0P Trip Units
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Pick-Up |
Drop-Out |
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Threshold |
Time Delay |
Threshold |
Time Delay |
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Current |
I |
0.5 to 1.0 x Ir per phase |
20% to 80% x tr |
0.3 to 1.0 x Ir per phase |
10 to 600 s |
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Power |
P |
200 kW to 10 MW |
10 to 3600 s |
100 kW to 10 MW |
10 to 3600 s |
Trip and Alarm Histories
The last ten trips and ten alarms are recorded in two separate history files that can be displayed on the screen (sample displays are shown to the right). The following information is contained in these files:
Trip History Type of fault Date and time of fault Interrupted current Contact wear |
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Alarm History Type of alarm Date and time of the alarm Values measured at the time of the alarm |
Power Trip Unit Metering
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Current Metering |
Maximum Current |
Voltage Metering |
Power Metering |
Frequency |
Power Demand |
The MicroLogic P trip unit calculates in real time all electrical values V, A, W, VAR, VA, Wh, VARh, VAh, Hz, power factor, and crest factor. The MicroLogic P trip unit also calculates demand current and demand power over an adjustable time period.
Real-Time Metering: The value displayed on the screen is refreshed every second. Minimum and maximum measurement values are stored in memory.
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Type of Measurement |
Unit of Measurement |
Measurement Source |
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Current |
IRMS |
A |
ØA, ØB, ØC or N |
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IAVERAGE |
A |
(ØA + ØB + ØC)/3 |
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IPEAK/Ö2 |
A |
ØA, ØB, ØC or N |
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Voltage |
VRMS |
V |
(ØA–ØB),. ØB–ØC) and (ØC–ØA) |
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VRMS |
V |
(ØA–N), (ØB–N) and ØC–N) |
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VIMBALANCE |
% |
VRMS |
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Power |
P, Q and S |
W, VAR, VA |
Total |
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EP, EQ and ES |
Wh, VARh, VAh |
Total |
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Power factor |
Total |
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Frequency |
F |
Hz |
50/60 |
Demand Metering: The demand is calculated over a fixed or sliding time window that can be programmed from five to sixty minutes. Depending on the contract signed with the power supplier, specific programming makes it possible to avoid or minimize the cost of overrunning the subscribed power. Maximum demand values are systematically stored and time stamped.
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Type of Measurement |
Unit of Measurement |
Measurement Source |
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Current |
IDEMAND |
A |
ØA, ØB, ØC or N |
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Power |
P, Q and SDEMAND |
W, VAR, VA |
Total |
Power Trip Units Communication Network
Four wire Modbus, RTU, RS485—The communication network may be used to:
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Remotely read parameters for the protection functions.
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Transmit all the measurements and calculated values.
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Signal the causes of tripping and alarms.
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Consult the history files and the maintenance indicator record.
In addition, an event log of the last 100 events and a maintenance record, which is stored in the trip unit memory but not available locally, may be accessed via the communication network.
The Modbus communication system is compatible with PowerLogic™ System Manager™ (SMS) software.
Power Trip Unit Event Log
The event log may be accessed by a remote computer via the communication network. All events are time stamped and include:
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Trips
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Beginning and end of alarms
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Modifications to settings and parameters
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Loss of time
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Overrun of wear indicators
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Test kit connections
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Counter resets
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System faults (thermal self-protection, major fault and minor fault alarms)