BECKWITH ELECTRIC M?3311A User manual

Instruction Book
M‑3311A Transformer
Protection Relay

Transformer Protection
M‑3311A
• For Transformers of All Sizes:
2, 3 or 4 winding Transformers for Transmission and
Distribution applications
Generator-Transformer Unit Overall Differential
Unit Protection of Other Electrical Apparatus and
certain Bus Arrangements (including those with a
transformer in the zone)
• Additional Applications: System Backup Protection, Load Shedding
(voltage and frequency), Bus Protection, and individual Breaker
Failure Protection for each winding input
• Available voltage configurations include zero, two or four voltage
inputs
• Ground Differential configurations include one, two or three
current inputs
• Optional Ethernet Connection and Expanded I/O
• Optional Voltage Package includes, 24 Volts/Hz
Overexcitation, 27 Phase Undervoltage, 59G Ground Overvoltage
and 81O/U Over/Under Frequency
Integrated Protection System®
Unit shown with optional M‑3931 HMI Module and M‑3911 Target Module
PROTECTION

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M‑3311A Transformer Protection Relay
Standard Protective Functions
• Negative-sequence inverse time overcurrent (46)
• Winding thermal protection (49)
• Four winding instantaneous phase overcurrent (50)
• Breaker Failure (50BF)
• Instantaneous ground overcurrent (50G)
• Instantaneous residual overcurrent (50N)
• Four winding inverse time phase overcurrent (51)
• Inverse time ground overcurrent (51G)
• Inverse time residual overcurrent (51N)
• Two, three or four winding phase differential (87T) and high set instantaneous (87H)
• Ground differential (87GD)
• IPSlogic®
Optional Voltage Protection Package
• Overexcitation (24) V/Hz, two definite time and one inverse time elements
• Phase Undervoltage (27) function for load shedding
• Phase Overvoltage (59)
• Ground Overvoltage (59G)
• Over/Underfrequency (81O/U)
Standard Features
• Eight programmable outputs and six programmable inputs
• Oscillographic recording
• Through-Fault Monitoring
• 8-target storage
• Real time metering of measured and calculated parameters, including demand currents
• Two RS-232 and one RS-485 communications ports
• Standard 19" rack-mount design
• Removable printed circuit board and power supply
• 50 and 60 Hz models available
• 1 or 5 A rated CT inputs available
• S-3300 IPScom®Communications Software
• IRIG-B time synchronization
• Sequence of Events Log
• Breaker Monitoring
• Multiple Setpoint Groups
• Trip Circuit Monitoring
• Includes MODBUS and DNP 3.0 protocols
• Summing Currents from multiple sources for 49, 50, 51, 50N, 51N, 87 GD and Through Fault functions
Optional Features
• Redundant Power Supply
• M-3911A Target Module
• M-3931 Human-Machine Interface (HMI) Module
• M-3801D IPSplot®Plus Oscillograph Analysis Software
• RJ45 Ethernet port utilizing MODBUS over TCP/IP, BECO 2200 over TCP/IP, IEC 61850 or DNP 3.0
protocol
• Expanded I/O (8 additional outputs and 12 additional inputs)
• Standard and Expanded I/O Models available in vertical panel mount
• Close Circuit Monitoring on Expanded I/O units

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M‑3311A Transformer Protection Relay
STANDARD PROTECTIVE FUNCTIONS
Device Setpoint
Number Function Ranges Increment Accuracy†
Negative Sequence Overcurrent
46W2/46W3/46W4
Definite Time
Pickup 0.10 to 20.00 A 0.01 A 0.1 A or 3%
(0.02 to 4.00 A) (0.02 A or 3%)
Time Delay 1 to 8160 Cycles 1 Cycle –1 to +3 Cycles or 1%
Inverse Time
Pickup 0.50 to 5.00 A 0.01 A 0.1 A or 3%
(0.10 to 1.00 A) (0.02 A or 3%)
Characteristic Curves Definite Time/Inverse/Very Inverse/Extremely Inverse/IEC Curves/IEEE
Time Dial Setting 0.5 to 11.0 0.1 3 Cycles or 5%
0.05 to 1.10 (IEC curves) 0.01
0.5 to 15.0 (IEEE curves) 0.1
Winding Thermal Protection
Time Constant 1.0 to 999.9 minutes 0.1 minutes
Maximum Overload Current 1.00 to 10.00 A 0.01 A 0.1 A or 2%
(0.2 to 2.00 A) (0.02 A or 3%)
Winding Select Sum1, Sum2, W1, W2, W3, or W4
Instantaneous Phase Overcurrent
1-8
Pickup 1.0 to 100.0 A 0.1 A 0.1 A or 3%
(0.2 to 20.0 A) (0.02 A or 3%)
Time Delay 1 to 8160 Cycles 1 Cycle 2 Cycles or 1%
Current Selection Sum1, Sum2, W1, W2, W3, W4
Breaker Failure
50BFW1/50BFW2/50BFW3/50BFW4
Pickup (phase) 0.10 to 10.00 A 0.01 A 0.1 A or 2%
(0.02 to 2.00 A) (0.02 A or 2%)
Pickup (residual) 0.10 to 10.00 A 0.01 A 0.1 A or 2%
(0.02 to 2.00 A) (0.02 A or 2%)
Time Delay 1 to 8160 Cycles 1 Cycle –1 to +3 Cycles or 2%
Instantaneous Ground Overcurrent
50GW2/50GW3/50GW4
Pickup #1, #2 1.0 to 100.0 A 0.1 A 0.1 A or 3%
(0.2 to 20.0 A) (0.02 A or 3%)
Time Delay #1, #2 1 to 8160 Cycles 1 Cycle 2 Cycles or 1%
†Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.
46
49
50
50
BF
50G

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M‑3311A Transformer Protection Relay
STANDARD PROTECTIVE FUNCTIONS (cont.)
Device Setpoint
Number Function Ranges Increment Accuracy†
Instantaneous Residual Overcurrent
1-8
Pickup 1.0 to 100.0 A 0.1 A 0.1 A or 3%
(0.2 to 20.0 A) (0.02 A or 3%)
Time Delay 1 to 8160 Cycles 1 Cycle 2 Cycles or 1%
Current Selection Sum1, Sum2, W1, W2, W3, W4
Inverse Time Phase Overcurrent
1-4
Pickup 0.50 to 12.00 A 0.01 A 0.1 A or 3%
(0.10 to 2.40 A) (0.02 A or 3%)
Current Selection Sum1, Sum2, W1, W2, W3, W4
Characteristic Curve Beco Definite Time/Inverse/Very Inverse/Extremely Inverse
IEC Inverse/Very Inverse/Extremely Inverse/Long Time Inverse
IEEE Moderately Inverse/Very Inverse/Extremely Inverse
Time Dial Setting 0.5 to 11.0 0.1 3 Cycles or 3%
0.05 to 1.10 (IEC curves) 0.01
0.5 to 15.0 (IEEE curves) 0.1
Two or three of the windings may be summed together.
Inverse Time Ground Overcurrent
51GW2/51GW3/51GW4
Pickup 0.50 to 12.00 A 0.01 A 0.1 A or 3%
(0.10 to 2.40 A) (0.02 A or 3%)
Characteristic Curve Beco Definite Time/Inverse/Very Inverse/Extremely Inverse
IEC Inverse/Very Inverse/Extremely Inverse/Long Time Inverse
IEEE Moderately Inverse/Very Inverse/Extremely Inverse
Time Dial Setting 0.5 to 11.0 0.1 3 Cycles or 3%
0.05 to 1.10 (IEC curves) 0.01
0.5 to 15.0 (IEEE curves) 0.1
Inverse Time Residual Overcurrent
1-4
Pickup 0.50 to 6.00 A 0.01 A 0.1 A or 3%
(0.10 to 1.20 A) (0.02 A or 3%)
Characteristic Curve Beco Definite Time/Inverse/Very Inverse/Extremely Inverse
IEC Inverse/Very Inverse/Extremely Inverse/Long Time Inverse
IEEE Moderately Inverse/Very Inverse/Extremely Inverse
Time Dial Setting 0.5 to 11.0 0.1 3 Cycles or 5%
0.05 to 1.10 (IEC curves) 0.01
0.5 to 15.0 (IEEE curves) 0.1
Current Selection Sum1, Sum2, W1, W2, W3, W4
†Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.
50N
51
51G
51N

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M‑3311A Transformer Protection Relay
STANDARD PROTECTIVE FUNCTIONS (cont.)
Device Setpoint
Number Function Ranges Increment Accuracy†
Phase Differential Current
87H
Pickup 5.0 to 20.0 PU 0.1 PU 0.1 PU or 3%
Time Delay 1 to 8160 Cycles 1 Cycle –1 to +3 Cycles or 1%
87T
Pickup 0.10 to 1.00 PU 0.01 PU 0.02 PU or 5%
Percent Slope #1 5 to 100% 1% 1%
Percent Slope #2 5 to 200% 1% 1%
Slope Break Point 1.0 to 4.0 PU 0.1 PU —
Even Harmonics Restraint 5 to 50% 1% 1% or 0.1 A
(2nd and 4th)
5th Harmonic Restraint 5 to 50% 1% 1% or 0.1 A
Pickup at 5th
Harmonic Restraint 0.10 to 2.00 PU 0.01 PU 0.1 PU or 5%
CT Tap W1/W2/W3/W4 1.00 to 100.00 0.01 —
(0.2 to 20)
Trip response for 87T and 87H (if time delay set to 1 cycle) is less than 1.5 cycles. Each restraint element may be
individually disabled, enabled, or set for cross phase averaging.
Ground Differential
87GDW2/87GDW3/87GDW4
Pickup #1, #2 0.2 to 10.00 A 0.01 A 0.1 A or 5%
(0.04 to 2.00 A) (0.02 A or 5%)
Time Delay #1, #2 1 to 8160 Cycles* 1 Cycle –1 to +3 Cycles or 1%
3IOCurrent Selection Sum1, Sum2, W2**, W3**, W4**
Directional Element Disable/Enable
CT Ratio Correction (Rc) 0.10 to 7.99 0.01
*The Time Delay should not be less than 2 cycles.
This function is selectable as either directional or non-directional. If 3l0is extremely small, directional element is
disabled.
**Individual windings are selectable only for the same winding ground differential element. For example, you may
select W4 for 87GDW4 but not for 87GDW2 or 87GDW3.
†Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.
87
87
GD

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M‑3311A Transformer Protection Relay
STANDARD PROTECTIVE FUNCTIONS (cont.)
Device Setpoint
Number Function Ranges Increment Accuracy†
IPSlogic
IPSlogic uses element pickups, element trip commands, control/status input state changes,
output contact close signals with programmable logic array to develop schemes.
Reset/Dropout Delay #1–#6 0 to 65500 Cycles 1 Cycle 1 Cycle or 1%
Time Delay #1–#6 1 to 65500 Cycles 1 Cycle 1 Cycle or 1%
Trip (Aux Input) Circuit Monitor
Trip Circuit Monitor
TCM Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
TCM Dropout Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
TCM via the "Aux Input" is the only available Trip Circuit monitor on non-expanded I/O units.
The TCM input is provided for monitoring the continuity of trip circuits. The input can be used for nominal trip coil
voltages of 24 Vdc – 250 Vdc. Trip circuit monitoring is performed in the active breaker status only (trip circuit
supervision when breaker is closed). Both the DC supply and continuity for the circuit is monitored.
Breaker Monitoring
Pickup 1 to 50,000 kA Cycles 1 kA Cycles  1 kACycles
or kA2Cycles or kA2Cycles or kA2Cycles
Time Delay 0.1 to 4095.9 Cycles 0.1 Cycles 1 Cycle or 1%
Timing Method IT or I2T
Preset Accumulators 0 to 50,000 kA Cycles 1 kA Cycle
Phase A, B, C
The Breaker Monitor feature calculates an estimate of the per-phase wear on the breaker contacts by measuring
and integrating the current (or current squared) through the breaker contacts as an arc.
The per-phase values are added to an accumulated total for each phase, and then compared to a user-
programmed threshold value. When the threshold is exceeded in any phase, the relay can set a programmable
output contact.
The accumulated value for each phase can be displayed.
The Breaker Monitoring feature requires an initiating contact to begin accumulation, and the accumulation begins
after the set time delay.
†Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.
IPS
TCM
BM

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M‑3311A Transformer Protection Relay
STANDARD PROTECTIVE FUNCTIONS (cont.)
Device Setpoint
Number Function Ranges Increment Accuracy†
Through Fault
Through Fault 1.0 to 100.0 A 0.1A 0.1A or 5%
Current Threshold (0.2 to 20.0 A) (0.02A or 5%)
Through Fault Count Limit 1 to 65535 1 —
Cumulative I2T Limit 1 to 1000000(kA2Cycles) 1 1.0 kA Cycles
or kA2Cycles
Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
Current Selection Sum1, Sum2, W1, W2, W3 or W4 — —
Nominal Settings
Nominal Voltage 60.0 to 140.0 V 0.1 V —
VT Configuration VA, VB, VC, VAB, VBC, VCA, VG
Phase Rotation ABC/ACB — —
Number of Windings 2, 3, or 4
Transformer/CT Connection Standard IEEE/IEC or Custom Connections
Functions that can be Implemented with Overcurrent/Input‑Output
Connections
Load Shedding
Can help prevent overloading of remaining transformers when a station transformer is out of service.
Bus Fault Protection
Provides high speed bus protection by combining digital feeder relay logic and transformer protection
logic.
Feeder Digital Relay Backup
Provides backup tripping of feeder relays by combining the self test alarm output of the feeder relays
with the transformer relay.
LTC fault blocking
Provides limited blocking of LTC during fault conditions.
†Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.
TF

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M‑3311A Transformer Protection Relay
OPTIONAL VOLTAGE PROTECTION PACKAGE
Device Setpoint
Number Function Ranges Increment Accuracy†
Volts/Hz Overexcitation
Definite Time
Pickup #1, #2 100 to 200% 1% 1%
Time Delay #1, #2 30 to 8160 Cycles 1 Cycle 25 Cycles
Inverse Time
Pickup 100 to 150% 1% 1%
Characteristic Curves Inverse Time #1–#4 — —
Time Dial: Curve #1 1 to 100 1 1%
Time Dial: Curves #2–#4 0.0 to 9.0 0.1 1%
Reset Rate 1 to 999 Sec. 1 Sec. 1 Second or 1%
(from threshold of trip)
Pickup based on nominal VT secondary voltage and nominal system frequency. Accuracy applicable from 10 to 80
Hz, 0 to 180 V, and 100 to 150% V/Hz.
This function is applicable only when phase voltage input is applied.
Phase Undervoltage
Pickup #1, #2*, #3* 5 to 140 V 1 V 0.5 V
Inhibit Setting 5 to 140 V 1 V 0.5 V
Time Delay 1 to 8160 Cycles 1 Cycle –1 to +3 Cycles or 1%
This function is applicable only when phase voltage input is applied.
* Elements #2 and #3 are not available in four winding applications.
Phase Overvoltage
1-3
Pickup 5 to 180 V 1 V 0.5 V or 0.5%
Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
Input Voltage Selection Phase, Positive Sequence, Negative Sequence
Ground Overvoltage
Pickup #1, #2, #3* 5 to 180 V 1 V 0.5 V or 0.5%
Time Delay #1, #2, #3* 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
Zero Sequence Voltage** VGor 3V0(Only for 2/3 Windings, 4 Voltage Inputs)
This function is applicable only when voltage input from a broken delta VT is applied.
* Element #3 is not available in four winding applications.
** This setting is only functional in 2/3 winding applications with firmware version V02.03.01 and later.
24
27
59
59G
†Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.

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M‑3311A Transformer Protection Relay
†Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.
OPTIONAL VOLTAGE PROTECTION PACKAGE
Device Setpoint
Number Function Ranges Increment Accuracy†
Overfrequency/Underfrequency
Pickup #1, #2, #3, #4 55.00 to 65.00 Hz 0.01 Hz 0.1 Hz
45.00 to 55.00 Hz*
Time Delay #1, #2, #3, #4 2 to 65,500** Cycles 1 Cycle –1 to +3 Cycles or 1%
Accuracy applies to 60 Hz models at a range of 57 to 63 Hz, and to 50 Hz models at a range of 47 to 53 Hz.
* This range applies to 50 Hz nominal frequency models.
** For 65,500 cycles, time delay setting phase voltage must be greater than 35 Vac.
This function is applicable only when phase voltage of at least 27 Vac input is applied.
Trip and Close Circuit Monitor (Expanded I/O Units)
Trip Circuit Monitor
TCM-1 Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
TCM-1 Dropout Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
TCM-2 Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
TCM-2 Dropout Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
Close Circuit Monitor
CCM-1 Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
CCM-1 Dropout Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
CCM-2 Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
CCM-2 Dropout Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%
The CCM/TCM inputs are provided for monitoring the continuity of trip and close circuits. The input(s) can be
used for nominal trip/close coil voltages of 24 Vdc – 250 Vdc. Trip and closing circuit monitoring are performed in
the active breaker status only (trip circuit supervision when breaker is closed and close circuit supervision when
breaker is open). Both the DC supply and continuity for each of the circuits are monitored.
81
O/U
TCM
CCM

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M‑3311A Transformer Protection Relay
Configuration Options
The M-3311A Transformer Protection Relay may be purchased as a fully configured two, three or four winding
Transformer Protection System. The M-3311A can also be purchased with the Optional Voltage Protection
Package to expand the system to satisfy specific application needs.
M-3311A Conguration Options
Windings Ground Inputs Voltage Inputs
Two One
Zero
Two
Four
Three Two
Zero
Two
Four
Four Three Zero
Two
Multiple Setpoint Profiles (Groups)
The relay supports four setpoint profiles. This feature allows multiple setpoint profiles to be defined for different
power system configurations. Profiles can be switched either manually using the Human-Machine Interface
(HMI), communication, or by control/status inputs.
Metering
Metering of voltage, three-phase and neutral currents, and frequency. Phase voltage and current metering
include sequence components.
Real Time Demand (interval of 15, 30 or 60 minutes), and Maximum Demand (with date and time stamp)
metering of current.
Metering accuracies are:
Voltage: 0.5 V or 0.5%, whichever is greater (range 0 to 180 Vac)
Current: 5 A rating, 0.1 A or 3%, whichever is greater (range 0 to 14 A)
1 A rating, 0.02 A or 3%, whichever is greater (range 0 to 2.8 A)
Power: 0.01 PU or 2% of VA applied, whichever is greater
Frequency: 0.1 Hz (from 57 to 63 Hz for 60 Hz models; from 47 to 53 Hz for 50 Hz models)
Volts/Hz: 1%
Oscillographic Recorder
The oscillographic recorder provides comprehensive data recording of all monitored waveforms for Windings 1,
2, 3 and 4. The total record length is user-configurable up to 24 partitions. The amount of data stored depends
on the winding configuration and number of partitions. For example; 2 windings and 1 partition configuration
can store up to 311 cycles, 3 windings and 1 partition configuration can store up to 231 cycles and 4 windings
and 1 partition configuration can store up to 183 cycles.
The sampling rate is 16 times the power system nominal frequency (50 or 60 Hz). The recorder is triggered
by a designated status input, trip output, or using serial communications. When untriggered, the recorder
continuously stores waveform data, thereby keeping the most recent data in memory. When triggered, the
recorder stores pre-trigger data, then continues to store data in memory for a user-defined, post-trigger delay
period. The records may be analyzed using Beckwith Electric IPSplot®Plus Oscillograph Analysis Software,
and are also available in COMTRADE file format.

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M‑3311A Transformer Protection Relay
Sequence of Events Log
The Sequence Events Log records predefined relay events. The Sequence of Events Log includes 512 of the
most recently recorded relay events. The events and the associated data is available for viewing utilizing the
S-3300 IPScom Communications Software. The sequence of events log is stored in RAM and will be erased
if power to the relay is removed.
Through Fault Recorder
In addition to the Even Recorder, the M-3311A also has a separate Through Fault Recorder, which records
Through Faults. Each through fault record contains the serial number of the fault, duration of the event, maximum
RMS fault current magnitude for each phase during the fault, I2t and the time stamp of the fault. In addition,
it will also store the total number of through faults since last reset and total I2t for each phase since last reset
(up to 256 records). The Through Fault Recorder log is stored in RAM and will be erased if power to the relay
is removed.
Target Storage
A total of 8 targets can be stored. This information includes the function(s) operated, the function(s) picked up,
input/output contact status, time stamp, phase and ground currents. The sequence of events log is stored in
RAM and will be erased if power to the relay is removed.
Calculations
Current and Voltage Values: Uses discrete Fourier Transform (DFT) algorithm on sampled voltage and current
signals to extract fundamental frequency phasors for M-3311A calculations.
Power Input Options
Nominal 110/120/230/240 V ac, 50/60 Hz, or nominal 110/125/220/250 V dc. UL rating, 85V ac to 265 V ac and
from 80 V dc to 288 V dc. Burden 20 VA at 120 V ac/125 V dc. Withstands 300 V ac or 300 V dc for 1 second.
Nominal 24/48 V dc, operating range from 18 V dc to 56 V dc. Burden 20 VA at 24 V dc and 20 VA at 48 V dc.
Withstands 65 V dc for 1 second.
An optional redundant power supply is available for units that are purchased without the I/O Expansion Module.
For those units purchased with the I/O Expansion Module the unit includes two power supplies which are required.
Sensing Inputs
Up to Four Voltage Inputs: Rated nominal voltage of 60 Vac to 140 Vac, 50/60 Hz.Withstands 240 V continuous
voltage and 360 V for 10 seconds.Voltage input may be connected to phase voltage (L-G or L-L), or to a broken
delta VT. Voltage transformer burden less than 0.2 VA at 120 V.
Up to 15 Current Inputs: Rated current (IR) of 5.0 A or 1.0 A (optional), 50/60 Hz. Withstands 3 IRcontinuous
current and 100 IRfor 1 second. Current transformer burden is less than 0.5 VA at 5 A (5 A option), or 0.3 VA
at 1 A (1 A option).
Control/Status Inputs
The control/status inputs, INPUT1 through INPUT6, can be programmed to block any of the relay functions,
trigger the oscillographic recorder, select a setpoint group, or to operate one or more outputs.The control/status
inputs are designed to be connected to dry contacts and are internally wetted, with a 24 Vdc power supply. To
provide breaker status LED indication on the front panel, the INPUT1 status input contact must be connected
to the 52b breaker status contact. The minimum current value to initiate/pickup an input is >25 mA.
The optional Expanded I/O includes an additional 12 programmable control/status inputs.

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M‑3311A Transformer Protection Relay
Output Contacts
Any of the functions can be individually programmed to activate any one or more of the eight programmable
output contacts OUTPUT1 through OUTPUT8. Any output contact can also be selected as pulsed or latched.
IPSlogic can also be used to activate an output contact.
The optional I/O Expansion Module includes an additional 8 programmable output contacts.
The eight output contacts (six form ‘a’ and two form ‘c’), the power supply alarm output contact (form ‘b’), the
self-test alarm output contact (form ‘c’) and the optional 8 I/O Expansion Module output contacts (form 'a') are
all rated per IEEE C37.90/UL (See Tests and Standards section for details).
Breaker Monitoring
The Breaker Monitoring function calculates an estimate of the per-phase wear on the breaker contacts by
measuring and integrating the current (selected as I2t or It) passing through the breaker contacts during the
interruption interval. The per-phase values are summed as an accumulated total for each phase, and then
compared to a user-programmed threshold value. When the threshold is exceeded in any phase, the relay
can activate a programmable output contact. The accumulated value for each phase can be displayed as an
actual value.
IPSlogic
This feature can be programmed utilizing the IPScom®Communications Software. IPSlogic takes the contact
input status and function status, and by employing (OR, AND and NOT) boolean logic and a timer can activate
an output or change setting profiles.
Target/Status Indicators and Controls
The RELAY OK LED reveals proper cycling of the microcomputer. The BRKR CLOSED LED illuminates when
the breaker is closed (when the 52b contact is open). The OSC TRIG LED indicates that oscillographic data
has been recorded in the unit's memory. The corresponding TARGET LED will illuminate when any of the relay
functions trip. Pressing and releasing the TARGET RESET button resets the TARGET LEDs if the conditions
causing the operation have been removed. Pressing and holding the TARGET RESET button will allow elements
or functions in pickup to be displayed. The PS1 and PS2 LEDs remain illuminated as long as power is applied
to the unit and the power supply is operating properly. TIME SYNCH LED illuminates when valid IRIG-B signal
is applied and time synchronization has been established.
Communication
Communication ports include rear RS-232 and RS-485 ports, a front RS-232 port and a rear IRIG-B port
(Ethernet port optional). The communications protocol implements serial, byte-oriented, asynchronous
communication, providing the following functions when used with the Windows™-compatible S-3300 IPScom®
Communications Software.
• Interrogation and modification of setpoints
• Time-stamped trip target information for the 8 most recent events
• Real-time metering of all measured and calculated quantities, real-time monitoring of percentage
differential characteristics, and vector displays of compensated and uncompensated phasors.
• Downloading of recorded oscillographic data
• Downloading of Through-Fault Event Log
• Downloading Sequence of Events
• MODBUS and DNP3.0 protocols are supported
• The optional Ethernet port can be purchased with MODBUS over TCP/IP, BECO2200 over TCP/IP,
DNP 3.0 protocol or with the IEC 61850 protocol
Detailed documentation on the above protocols is available on the Beckwith Electric website, at www.
beckwithelectric.com

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M‑3311A Transformer Protection Relay
IRIG‑B
The M-3311A accepts either modulated (B-122) using the BNC Port or demodulated (B-002) using the RS-232
Port IRIG-B time clock synchronization signals. The IRIG-B time synchronization information is used to correct
the local calendar/clock and provide greater resolution for target and oscillograph time tagging.
HMI Module (optional)
Local access to the M-3311A is provided through an optional M-3931 Human-Machine Interface (HMI) Module,
allowing for easy-to-use, menu-driven access to all functions via a 6-button keyboard and a 2-line by 24 character
alphanumeric display. The M-3931 module includes the following features:
• User-definable access codes providing three levels of security
• Interrogation and modification of setpoints
• Time-stamped trip target information for the 8 most recent events
• Real-time metering of all measured and calculated quantities
I/O Expansion Module (optional)
An optional I/O Expansion Module provides an additional 8 form 'a' output contacts and an additional 12 control/
status inputs. Output LEDs indicate the status of the output relays.
Target Module (optional)
An optional M-3911A Target Module provides 24 target and 8 output LEDs. Appropriate target LEDs illuminate
when the corresponding M-3311A function trips. The targets can be reset with the M-3311A TARGET RESET
button if the trip conditions have been removed. The OUTPUT LEDs illuminate when a given programmable
output is actuated.
M‑3801D IPSplot®Plus Oscillograph Analysis Software (optional)
M-3801D IPSplot Plus Oscillograph Analysis Software enables the plotting and printing of M-3311A waveform
data downloaded from the relay to any Microsoft®Windows®PC compatible computer.
Tests and Standards
The relay complies with the following type tests and standards:
Voltage Withstand
Dielectric Withstand
IEC 60255-27 2,000 Vac/3,500 Vdc for 1 minute applied to each independent circuit to earth
2,000 Vac/3,500 Vdc for 1 minute applied between each independent circuit
1,500 Vdc for 1 minute applied to IRIG-B circuit to earth
1,500 Vdc for 1 minute applied between IRIG-B to each independent circuit
1,500 Vdc for 1 minute applied between RS-485 to each independent circuit
Impulse Voltage
IEC 60255-27 5,000 V pk, +/- polarity applied to each independent circuit to earth
5,000 V pk, +/- polarity applied between each independent circuit
1.2 by 50 µs, 500 ohms impedance, three surges at 1 every 5 seconds
Insulation Resistance
IEC 60255-27 > 10 G Ω
Voltage Interruptions Immunity
IEC 61000-4-11 (AC) 5 cycles, (DC) 30 ms - max

–14–
M‑3311A Transformer Protection Relay
Electrical Environment
Electrostatic Discharge Test
IEC 61000-4-2 Level 4 (8 kV)–point contact discharge
IEC 61000-4-2 Level 4 (15 kV)–air discharge
Fast Transient Disturbance Test
IEC 61000-4-4 Level 4 (4 kV, 5 kHz)
Emissions
EN 55022 Class A Limits
Conducted Emissions 150 kHz–30 MHz CISPR22
Radiated Emissions 30 MHz–1000MHz CISPR22
Surge Withstand Capability
IEEE 2,500 V pk-pk oscillatory applied to each independent circuit to earth
C37.90.1- 2,500 V pk-pk oscillatory applied between each independent circuit
1989 5,000 V pk Fast Transient applied to each independent circuit to earth
5,000 V pk Fast Transient applied between each independent circuit
IEEE 2,500 V pk-pk oscillatory applied to each independent circuit to earth
C37.90.1- 2,500 V pk-pk oscillatory applied between each independent circuit
2012 4,000 V pk Fast Transient burst applied to each independent circuit to earth
4,000 V pk Fast Transient burst applied between each independent circuit
NOTE: Digital data circuits (RS-232, RS-485, IRIG-B, Ethernet communication port and field ground coupling
port) through capacitive coupling clamp.
IEC 61000-4-5 ±4,000 V pk, 12 Ω/ 40 Ω
Radiated Susceptibility
IEEE C37.90.2 80-1000 MHz @ 35 V/m
IEC 61000-4-3 80-1000 MHz @ 35 V/m
Output Contacts
IEEE C37.90 30 A make for 0.2 seconds at 250 Vdc Resistive
UL 508 8 A carry at 120 Vac, 50/60 Hz
CSA C22.2 No. 14 6 A break at 120 Vac, 50/60 Hz
0.5 A break at 48 Vdc, 24 VA
0.3 A break at 125 Vdc, 37.5 VA
0.2 A break at 250 Vdc, 50 VA
Atmospheric Environment
Temperature
IEC 60068-2-1 Cold, –20° C (–4° F) – Operating
IEC 60068-2-30 Damp Heat Condensation Cycle +25° C, +55° C @ 95% RH – Operating
IEC 60068-2-2 Dry Heat, +70° C (+158° F) – Operating
IEC 60068-2-78 Damp Heat, +40° C @ 95% RH – Operating

–15–
M‑3311A Transformer Protection Relay
Mechanical Environment
Vibration
IEC 60255-21-1 Vibration response Class 1, 0.5 g
Vibration endurance Class 1, 1.0 g
IEC 60255-21-2 Shock Response Class 1, 0.5 g
Shock Withstand Class 1, 15.0 g
Bump Endurance Class 1, 10.0g
Compliance
CULUS-Listed per 508 – Industrial Control Equipment
– Industrial Control Equipment Certified for Canada CAN/USA C22.2 No. 14-M91
CULUS-Listed per 508A – Table SA1.1 Industrial Control Panels
Product Safety – IEC 60255-27, CAT III, Pollution Degree 2
External Connections
M-3311A external connections points are illustrated in Figure 1 and 2.
Physical
Without Optional I/O Expansion Module
Size: 19.00" wide x 5.21" high x 10.20" deep (48.3 cm x 13.2 cm x 25.9 cm)
Mounting: The unit is a standard 19", semiflush, three-unit high, rack-mount panel design, conforming to ANSI/
EIA RS-310C and DIN 41494 Part 5 specifications. Vertical or horizontal panel-mount options are available.
Approximate Weight: 16 lbs (7 kg)
Approximate Shipping Weight: 25 lbs (11.3 kg)
With Optional I/O Expansion Module
Size: 19.00" wide x 6.96" high x 10.2" deep (48.3 cm x 17.7 cm x 25.9 cm)
Mounting: The unit is a standard 19", semiflush, four-unit high, rack-mount panel design, conforming to ANSI/
EIA RS-310C and DIN 41494 Part 5 specifications. Vertical or horizontal panel-mount options are available.
Approximate Weight: 19 lbs (8.6 kg)
Approximate Shipping Weight: 26 lbs (11.8 kg)
Recommended Storage Parameters
Temperature: 5° C to 40° C
Humidity: Maximum relative humidity 80% for temperatures up to 31° C, decreasing to 31° C linearly to 50%
relative humidity at 40° C.
Environment: Storage area to be free of dust, corrosive gases, flammable materials, dew, percolating water,
rain and solar radiation.
See M-3311A Instruction Book, Appendix E, Layup and Storage for additional information.
Patent & Warranty
The M-3311A Generator Protection Relay is covered by a ten-year warranty from date of shipment.
Specification subject to change without notice.

–16–
M‑3311A Transformer Protection Relay
Figure 1 Typical External Connections (See Instruction Book Chapter 5, for Details)
NOTES: 1. Output contacts #1 through #4 contain special circuitry for high-speed operation, and close 4 ms faster than outputs 5 through 8. Outputs 1
through 6 are form “a” contacts (normally open) and outputs 7 and 8 are form “c” contacts (center tapped 'a' and 'b' contacts).
2. To comply with UL and CSA listing requirements, terminal block connections must be made with #22–12 AWG solid or stranded copper wire
inserted in an AMP #324915 (or equivalent) connector. Wire insulation must be rated at 75°C minimum.Terminal block connections 1 through 34 must be tightened to 12 in-lbs torque. Terminal block connections 35 through 75 must be tightened to 8.0 in-lbs, minimum, 9.0 in-lbs, maximum torque. Over torquing may result in terminal damage.
3. Only dry contacts must be connected to inputs (terminals 5 through 10 with 11 common) because these contact sensing inputs are internally
wetted. Application of external voltage on these inputs may result in damage to the unit.
4. All relays are shown in the de-energized state, and without power applied to the relay 5. The power supply relay (P/S) is energized when the power supply is functioning properly. 6. The self-test relay is energized when the relay has performed all self-tests successfully.
62524645 49
47 48 50 51 53 54 55 56 57 58 59 60 61
LARGO, F L 33773-3724 [phone]
B E C K W IT H E L E C T R I C C O . , I N C .
6 19 0 118 t h AV E NO .
IRIG- B RS- 2 3 2
CO M 2
1 2 3 5
467 8 910 11 12 13 14 15
P S 1P S 2
63
64 65
3 AM P, 2 5 0 V ( 3 AB)
F 4 F 2
F 3
F 1
87
19
17
16 18 20 21 22
6 5 43
26
23 24 25 2827 29
2 1
30 31 32 33 34
S E L F - T E S TP / S
I N
R T N
I NI NI NI NI N 1234
5
I N 6
(5 2 b )
O U T P U T SA L A R M S
I N P U T S
RS- 485
COM
3
AU
X
+
-
+
-
RA T E D V O LT A G E
6 0 - 14 0 V A C,5 0 / 6 0 Hz
RAT ED C URRE NT
1A ,NO M
5 A ,NO M
WINDING 2 (W2)
B
IC
IG
IA
IIB
WINDING 3 (W3)
G
I
WINDING 4 (W4)
IB
IC
IIG
A
66 67 71
68 69 70 7372 74 75
W A RNING! CO NT A CT W IT H T ERMINA L S MA Y C A USE ELECT RIC S HO CK
FO R C ONT A CT RAT INGS SEE INST RUCT IO N MA NUA L
IC
CO M 2
18- 56VDC 85- 260VDC
/VAC
WINDING 1 (W1)
VOA
IB
IC
IA
I
35 36 3837 39 42
40 41 43 44
PS2
+-
PS1
+-
18- 56VDC 85- 260VDC
/VAC
24 125 250 48
SE RIA L NO .
5 0 Hz 6 0 Hz
MODEL: M-
3311A FIRMWARE: D-
0179
LISTED
IND. CONT. EQ.
83F4
CRU
S
ETHERNE
T
VOOR VG
Danger! Contact avec les terminaux peut causer unchoc electrique

–17–
M‑3311A Transformer Protection Relay
Figure 2 Typical External Connections With Optional Extended I/0 (See Instruction Book Chapter 5, for Details)
NOTES: 1. Output contacts #1 through #4 contain special circuitry for high-speed operation, and close 4 ms faster than outputs 5 through 8. Outputs 1
through 6 are form “a” contacts (normally open) and outputs 7 and 8 are form “c” contacts (center tapped 'a' and 'b' contacts).
2. To comply with UL and CSA listing requirements, terminal block connections must be made with #22–12 AWG solid or stranded copper wire
inserted in an AMP #324915 (or equivalent) connector. Wire insulation must be rated at 75°C minimum.Terminal block connections 1 through 34 and 76 through 115 must be tightened to 12 in-lbs torque. Terminal block connections 35 through 75 must be tightened to 8.0 in-lbs, minimum, 9.0 in-lbs, maximum torque. Over torquing may result in terminal damage.
3. ONLY dry contacts must be connected to inputs (terminals 5 through 10 with 11 common and terminals 68 through 79 with 64 through 67 com-
mon) because these contact inputs are internally wetted. Application of external voltage on these inputs may result in damage to the unit.
4. All relays are shown in the de-energized state, and without power applied to the relay 5. The power supply relay (P/S) is energized when the power supply is functioning properly. 6. The self-test relay is energized when the relay has performed all self-tests successfully.
PS 1
3AMP,2 50V(3AB)3AMP,2 50V(3AB)
PS2
F1 F2
F4
14 13 12 11 10 9
16 15
OUTPUTS
IN PUTS
IN
17
18 1314
15
16
RS232
76 77 80
78 79 81 82 92
85
83 84 86 87 88 89 9190 9793 94 95 96 98 99 113
101100102 103 108104105107
106109 110111 112114115
COM 2
INNIINNIIN
NI
RTN
727- 544-2326
BECKWITH ELECTRIC CO.INC .6190 118thAVE NO .
LARG O, FL 33773
MODEL: M-3311ASERIAL NO.
60Hz50Hz
WARNING! CONTACT WITH TERMINALS MAY CAUSE ELECTRIC SHOCK
FOR CONTACT RATINGS SEE INSTRUCTIONAL MANUAL
62524645 49
47 48 50 51 53 54 55 56 57 58 59 60 61 63
64 65
RATEDVOLTAGE
60-140VAC,50/60Hz
RATEDCURRENT
1A ,NOM
5A,NOM
WINDING 2 (W2)
B
IC
IG
IA
IIB
WINDING 3 (W3)
G
I
VGWINDING 4 (W4)
IB
IC
IIG
A
66 67 71
68 69 70 7372 74 75
IC
ETHERNET
18 -56VDC 85-260VDC
/VAC
WINDING 1 (W1)
VOA
IB
IC
IA
I
35 36 3837 39 42
40 41 43 44
PS2
+-
PS1
+-
18 -56VDC
85-260VDC /VAC
1
AUX
-+
+
234
RS485
COM3
-3
IN PUTS
8
ININININ
65 7
56 4
IN IN
910
(52b)
21
SELF-TEST
12
IN
11
RT N
!
13 14 15
ALARMS
P/S
16 1817
8
20
19 21
7
28
OUTPUTS
25
2322 24
6
26 27
54
29 3130
3
32 33 34
21
USCR
83F4
LISTED IN D. CONT.EQ.
MOC2
!
!
1
2
IN
12
IN
11
IN
10
IN
9
IN
8
IN
7
48 12 5 25 0 24
CCM- 2TCM -2 CC M-1TCM-1
- ++-+-- +
Firmware: D-0179
B-GIRI
Danger! Contact avec les terminaux peut causer un choc electrique

–18–
M‑3311A Transformer Protection Relay
CT
VT
CT
This function is available as a
standard protective function.
M-3311A Typical
Connection Diagram
Two Winding Model
CT
Winding 1
(W1)
Winding 2
(W2)
A
B
87
GD
This function is available in the
Optional Voltage Protection Package
M-3311A
Targets
(Optional)
Integral HMI
(Optional)
Metering
Sequence Of
Events
Waveform Capture
IRIG-B
Front RS232
Communication
Multiple Setting
Groups
Programmable I/O
Self Diagnostics
Dual Power Supply
(Optional)
Rear RS-232/485
Communication
Programmable
Logic
51N
51N
50N
BF
87T 87H
50 51
50G 51G
50
BF 50 51 46
24 81U 27
R
59G
59
Figure 3 M‑3311A (Two Winding‑Two or Four Voltage Inputs) Typical One‑Line Function Diagram

–19–
M‑3311A Transformer Protection Relay
5150
46
50BF
50 51
59G
81
O/U 27
3-CT
3-CT
M-3311A
This function is available as a
standard protective function.
This function is available in the
Optional Voltage Protection
Packages.
M-3311A Typical
Connection Diagram
Three Winding Model
B
1-CT
R
87GD
50N
BF
51N
87H
Winding 1
(W1)
Winding 2
(W2)
Winding 3
(W3)
50G 51G
C
24
87T 46
50BF
50 51
50G 51G 87GD
50N
BF
51N
R
NOTE
VT
3-CT
1-CT
50N
BF
51N
50BF
49
49
49
50N
50N
Targets
(Optional)
Integral HMI
(Optional)
Metering
Sequence Of
Events
Waveform Capture
IRIG-B
Front RS232
Communication
Multiple Setting
Groups
Programmable I/O
Self Diagnostics
Dual Power Supply
(Optional)
*
*
*
Rear RS-232/485
Communication
Programmable
Logic
A
50N
59
NOTE
NOTE
NOTE
NOTE
* 49 Function can only be enabled in one winding.
NOTE: All 50 and 50G functions may be applied instantaneous or definite time, and are multiple (2)
elements, each with individual pickup and time delay setpoints.
Figure 4 M‑3311A (Three Winding‑Zero, Two or Four Voltage Inputs) Typical One‑Line
Function Diagram