Beckwith M-3310 Transformer Integrated Protection Device Specification

Beckwith M-3310 Transformer Integrated Protection Device Specification

Basic product information

Product Name: M-3310 Digital Transformer Integrated Protection System, suitable for various types of dual winding transformers, and can also be used in some three winding scenarios.

Core positioning: Fully digital multifunctional relay protection, equipped with complete differential, phase to phase, grounding, negative sequence, and circuit breaker failure protection as standard; Optional three-phase voltage excitation, low-frequency, and undervoltage protection packages; Support 4 sets of fixed value switching, fault recording, event recall, and multi protocol communication.

Standard built-in full set of protection functions (ANSI standard)

1. Current type main protection and backup protection

ANSI Number Protection Name Core Parameter Description

87T/87H transformer differential motion+high-value instantaneous differential split two fold slope, 2/4th harmonic braking, 5th overexcitation lockout, action ≤ 1.5 cycles; Support CT ratio correction

87GD grounding differential protection directional zero sequence differential with delay setting

46 negative sequence inverse time overcurrent divided into definite time/inverse time multiple characteristic curves, suitable for three-phase imbalance and phase failure faults

50W1/50W2 high and low voltage side two sections instantaneous overcurrent fixed 2-cycle trip, quick break protection

51W1/51W2 high and low voltage side inverse time limit phase overcurrent multi class national standard/IEC inverse time limit curve, long-term overload backup

50G/51G neutral point instantaneous/inverse time overcurrent transformer body grounding fault protection

Grounding backup of zero sequence inverse time overcurrent winding on both sides of 51NW1/51NW2

50BF circuit breaker failure protection phase separation/zero sequence independent start delay

EXT1-6 6-way external logic extension function with external switch triggering custom trip logic and customizable delay

2. Optional three-phase voltage protection package (optional)

Purpose of ANSI Number Protection Function

24 V/Hz overexcitation protection with fixed time limit and inverse time limit dual section to prevent transformer damage caused by iron core saturation

27 phase undervoltage can be used for graded load shedding

59G Neutral Point Overvoltage Monitoring Open Triangle Zero Sequence Overvoltage

81U low-frequency protection with three frequency settings, islanding/power loss low-frequency load shedding

Standard universal hardware functions for the entire machine

Fixed value management: 4 sets of independent fixed value groups, which can be manually/automatically switched through panel HMI, communication, external switch values, and adapted to different operating modes.

IO resources: 6 programmable passive switch inputs, 8 programmable outputs (6 normally open A type+2 converted C type), and dedicated relays for independent power supply faults and self check alarms.

3 measurement functions: real-time three-phase voltage/current, power, power factor, active/reactive/apparent load; Support 15/30/60 minute demand statistics, store maximum value with time scale, and classify measurement accuracy.

Fault recording (oscilloscope): Sampling rate 16 times the power frequency, maximum 170 cycles per segment, can be divided into 4 segments for storage; Complete waveform recording before and after the fault, supporting software export of COMTRADE standard waveform files.

Event recollection: 32 fault actions are stored, recording the type of protection action, phase current, switch status, and precise time scale.

Communication and clock: dual RS232, 1-channel RS485, optional four wire RS485; Supports MODBUS and BECO2200 protocols; Standard IRIG-B timing (compatible with amplitude modulation/demodulation signals).

Hardware structure: Standard 19 inch rack with a height of 3U, PCB board and power module can be disassembled separately; Supports both 50Hz and 60Hz models, with optional 1A/5A secondary rating for CT input.

Optional accessory module

M-3931 HMI human-machine interface: external operation panel, 2-line 24 character display screen, 6 buttons, three-level password permission, local viewing of fixed values, waveform recording, and events.

M-3910 Target action indicator module: 24 fault indicator lights+8 output status lights, visually displaying the protection trip type.

Redundant power supply: Dual power supply redundancy to prevent the shutdown of single power supply devices.

supporting software

M-3820A IPScom: PC debugging communication software, parameter reading and writing, online monitoring;

M-3801D IPSplot PLUS: waveform analysis software for recording, supporting COMTRADE format conversion.

Electrical input and output specifications

1. Analog sampling circuit

Voltage input: 4-channel PT sampling, rated at 60-140V, long-term 240V, short-term 360V withstand, load ＜ 0.2VA;

Current input: 7-channel CT sampling, 1A/5A optional, 2 times rated long-term, 100 times 1-second short-term withstand, 5A version load 0.5VA, 1A version 0.3VA.

2. Switching input

6-way passive dry contact, internal 24V wet current, action current ≥ 25mA; can be used for locking protection, triggering waveform recording, switching constant value, and circuit breaker position feedback (56a).

3. Output relay

Compliant with IEEE C37.90 standard; Short term connection of 30A resistive, long-term 8A (120VAC); Output 1-4 high-speed actions (4ms), 5-8 regular contacts.

4. Power supply

Communication: 110/120/230/240V AC, 85-265V wide; DC 110/125/220/250V DC;

Low voltage DC type: 24/48V DC (18~56V); The overall power consumption is 20VA; dual redundant power supplies are optional.

Environmental, Mechanical, and Safety Certification

Temperature and humidity: working -20 ℃~+70 ℃, humid and hot 93% RH, no condensation; Storage at 5-40 ℃; Passed IEC high and low temperature, wet heat cycle testing.

Electromagnetic compatibility: IEC 61000 electrostatic 8kV, 4kV fast transient; IEEE oscillation surge and RF radiation immunity; The insulation withstand voltage between 3500V DC circuits meets IEC 255.

Mechanical: 19 inch standard rack 3U, size 48.3 × 13.2 × 25.9cm, net weight 7.7kg; supports horizontal/vertical cabinet loading, provides old GE/Westinghouse equipment renovation drilling solution.

Certification: cULus industrial control certification, IACS/IEC standard for general vibration and impact rating of ships/substations, PCB flame retardant and moisture-proof coating.

Typical extended application logic

By relying on complete protection and IO programmable capabilities, multiple station control logics can be implemented:

Segmented load shedding (27 undervoltage protection linkage output);

Bus fault backup protection;

3. Failure of feeder protection and remote tripping;

On load voltage regulation LTC fault lockout;

Multiple fixed value group adaptation for main/backup transformers, different operating modes.