Beckwith M-3311A Transformer Integrated Protection Device

Beckwith M-3311A Transformer Integrated Protection Device

Product positioning and applicable application scenarios

1. Core applicable equipment

2/3/4 winding transmission and distribution transformers; Complete set of differential protection for generator transformer unit; Protection of busbars and other primary equipment units within the station; Busbar protection with transformer in the area.

2. Expand auxiliary applications

System backup protection, low-frequency and low-voltage load shedding, busbar protection, and independent circuit breaker failure protection for each winding.

3. Optional hardware input configuration options

Voltage input: 0/2/4 channels; Grounding differential current input: 1/2/3 channels;

Optional voltage pack can achieve overexcitation, undervoltage, overvoltage, grounding overvoltage, high and low frequency protection;

Optional Ethernet and extended IO modules.

Standard standard protection function (ANSI standard protection number)

All protection supports independent setting of multiple windings, current summation logic, and supports two CT secondary rated current specifications of 1A/5A. The parameters include independent setting range, step size, and accuracy indicators.

46 Negative sequence inverse time overcurrent: Multiple characteristic curves (Beco/IEC/IEEE) for definite time/inverse time, suitable for three-phase unbalanced faults;

49 winding thermal overload protection: supports single winding/multi winding current summation, adjustable thermal time constant and maximum overload current;

50 Four winding instantaneous phase overcurrent: multiple sets of components independently set values and delay;

50BF circuit breaker failure protection: dual criteria for phase current and zero sequence current, independent delay;

50G instantaneous grounding overcurrent; 50N instantaneous residual zero sequence overcurrent;

51 Four winding inverse time overcurrent: Built in multiple sets of standard inverse time curve libraries;

51G inverse time grounded overcurrent; 51N inverse time residual zero sequence overcurrent;

87T transformer winding differential protection (main protection)

Equipped with 87H high-value instantaneous differential quick break; Double slope braking, 2nd/4th harmonic surge braking, 5th harmonic overexcitation braking;

CT ratio compensation and harmonic braking can be separately activated/deactivated/averaged across phases; Trip response under 1-cycle delay<1.5 cycles;

87GD grounding differential protection: optional direction/no direction criterion, suitable for independent grounding fault discrimination of each winding;

IPSigmic programmable logic: By using Boolean and/or/non logic+timer, custom protection linkage, locking, and switching logic can be achieved;

TCM trip circuit monitoring: monitoring the integrity of the trip circuit, compatible with 24-250V DC trip coils; Expand IO and add CCM for monitoring the closing circuit;

BM circuit breaker wear monitoring: integrate It/I ² t to calculate contact burnout, output alarm beyond limit;

TF traversal fault record: Accumulate the number of faults, total I ² t, and record the fault characteristic quantity.

Optional voltage protection package (optional function)

Only available when connected to voltage transformer input:

24 V/Hz overexcitation protection: 2 fixed time limits+1 inverse time limit to suppress transformer over flux overheating;

27 phase undervoltage: used for low-voltage load shedding logic;

59 phase overvoltage;

59G zero sequence grounding overvoltage: adapted to open delta PT, calculate 3V0 zero sequence voltage;

81O/U over/under frequency: 4 sets of independent frequency components, corresponding to the tuning intervals of the 50/60Hz system.

Standard hardware functions and general characteristics

Human computer interaction: Front HMI LCD panel (2 lines of 24 characters, 6 buttons), Level 3 permission password; Independent Target fault indicator module, storing 8 sets of fault action records;

IO configuration (standard type): 6 programmable inputs, 8 programmable outputs; Expanding IO can add an additional 12 inputs and 8 outputs;

Wave recording and event recording

Oscillographic recording: Sampling rate 16 times the power frequency, up to 24 storage partitions, supports COMTRADE standard waveform files, and comes with M-3801D IPSplot Plus analysis software; Data loss due to power outage;

SOE event sequence record: stores 512 latest events; Independent records of fault crossing (up to 256 records); Fault Target stores 8 sets of action information; All records of power loss;

Real time measurement: three-phase voltage/current, sequence components, frequency, power; 15/30/60 minute demand, maximum demand with time scale; Provide separate measurement accuracy for voltage, current, power, and frequency;

Communication interface (standard)

2-channel RS232, 1-channel RS485; IRIG-B time synchronization (modulation B-122/demodulation B-002 dual standard);

Supporting upper software S-3300 IPScom, supporting fixed value reading and writing, waveform recording download, and event reading;

Native support for MODBUS and DNP3.0 serial port protocols;

Multi group setting area: 4 sets of independent setting values, which can be manually switched on the panel, communicate, and input signals, and adapt to various operating modes of the system;

Basic hardware design: standard 19 inch rack installation, detachable PCB and power module; Supports 50/60Hz power frequency models; CT secondary 1A/5A optional;

power input

Main power supply: AC/DC universal (AC85~265V/DC80~288V), 24/48VDC low voltage model;

Optional redundant power supply; Models with extended IO modules come standard with dual power supplies.

Optional expansion of hardware functionality

Ethernet RJ45 10/100M electrical port, optional protocols: MODBUS TCP, DNP3 TCP, IEC 61850 (up to 4 concurrent sessions);

Expand IO module: add 12 input and 8 output channels, and add CCM closing circuit monitoring; Support vertical panel models;

Specialized waveform recording analysis software M-3801D IPSplot Plus;

RS232/485 serial port with RJ45 interface;

Vertical panel installation of the entire machine style.

Measure input hardware parameters

Voltage input: up to 4 PT inputs, rated at 60-140Vac, long-term withstand voltage of 240V, short-term withstand voltage of 360V/10s, PT load<0.2VA; can be connected to phase voltage, line voltage, and open delta;

Current CT input: up to 15 CT channels, 5A/1A rated optional; Long term tolerance to 3 times the rated value and 1-second tolerance to 100 times the rated value; 5A model CT load<0.5VA, 1A model<0.3VA;

Open circuit: Passive dry contact, internal 24Vdc wet contact, operating current ≥ 25mA; INPUT1 can be connected to the auxiliary contact driving panel closing indicator light of the circuit breaker with a voltage of 52b;

Output relay contacts: standard 8-way output (6 normally open+2 conversion), power alarm normally closed, self-test alarm conversion; Expand IO and add 8 normally open channels; The contact meets the capacity specifications of IEEE C37.90 and UL508.

Communication and clock synchronization

IRIG-B timing: BNC interface supports modulation B122, RS232 supports demodulation B002, providing high-precision timing for waveform recording and fault events;

Ethernet features: automatic MDI-X adaptation, no need for crossover cables; IEC61850 supports no request reporting, fixed value modification, and full measurement;

All communication ports support constant value modification, real-time measurement, fault recording, and event log uploading.

Environmental, Mechanical, and Safety Standards

1. Working environment

Temperature: -20 ℃~+70 ℃ for operation; Storage at 5-40 ℃;

Humidity: up to 95% RH without condensation; Through high and low temperature wet heat cycle testing;

2. Mechanical endurance

Vibration, impact, and collision comply with IEC 60255-21 series, Class 1 level;

3. Electromagnetic compatibility and insulation withstand voltage

Meet the insulation withstand voltage and 5kV lightning impulse requirements of IEC 60255-27;

EMC: Electrostatic Discharge ESD Level 4, 4kV Fast Transient, 4kV Surge; Radiation immunity of 80-6000MHz; Conducted radiation complies with EN55022 Class A; IEEE C37.90.1/2 Surge and Radiation Tolerance Standard;

4. Certification compliance

CULus 508 industrial equipment certification, Canadian CAN/USA C22.2, CE EMC, IEC60255-27 CAT III pollution level 2; ISO9001 production system.

Physical dimensions and installation method

There are two types of models: standard without expansion IO and with expansion IO, supporting horizontal 19 inch rack and vertical panel installation:

Standard type (without extended IO): 19 inches wide x 5.21 inches high x 10.20 inches deep, net weight 7kg;

Extended IO model: 19 inches wide x 6.96 inches high x 10.20 inches deep, net weight 8.6kg;

Compliant with ANSI/EIA RS-310C and DIN 41494 industrial rack standards, the document includes hole dimensions, backplane terminal diagram, and front and rear views.

Typical application of a single line diagram covering a scene

The document comes with multiple sets of standard wiring logic diagrams, covering the mainstream working conditions of the project

Standard configuration for two winding/three winding/four winding transformers;

Multi winding current summation overcurrent protection scheme;

High resistance grounded three winding transformer;

Dual unit generator transformer differential protection and overall differential protection for the entire plant;

Parallel operation of dual main transformer and distribution stations;

Dual circuit breaker configuration on the high and low voltage sides of the autotransformer;

Wiring of single transformer high and low voltage circuit breakers.