Beckwith Electric M-5072 Retrofit Kit For M-4272 Digital Motor Bus Transfer System

The M-4272 Digital Motor Bus Transfer System and a M-5072 retrofit

kit provide the direct replacement of the M-0272/M-0236B Analog

Transfer Logic Controller. The physical change is very simple and

cost effective. The M-5072 retrofit kit consists of a bracket and

wiring harness that replicates the existing M-0272 terminal block

locations. The M-5072 terminal blocks are located in the same

positions as the M-0272 and it is attached to the M-4272.

The wire harness connects the appropriate terminals between

the M-4272 and the M-0272. This will allow a very simple

replacement of the existing M-0272 equipment. Since the

existing analog M-0272/M-0236B takes 7u height while the

M-4272 takes only 4u height. One rack mount black blank panel

with 1u height and one rack mount black blank panel with 2u

height are provided to fill up the empty spaces after the

replacement.Available are optional M-3919A Graphic Display

Unit (GDU) and Touch Screen Human Machine Interface (HMI)

for communicating with one or two M-4272 units.

Transformer relay protection systems are crucial for safeguarding transformers

within electrical distribution networks, designed to detect and respond to

abnormal conditions like overloads and short circuits. By monitoring transformer

performance and electrical parameters, these systems quickly identify potential

issues and initiate corrective actions, such as disconnecting power or adjusting

settings to maintain stability. Equipped with advanced technologies such as

differential, overcurrent, and thermal protection, these systems are tailored for

various applications, from industrial to utility-scale projects.

Essential for protecting assets and ensuring operational continuity, transformer

relay protection enhances the reliability and efficiency of power distribution

networks.

The M-7679 R-PAC offers protection, automation, and control capabilities

for recloser, switch, sectionalizer, and advanced distribution automation

applications. It has over 30 protection elements for optimal protection

of power distribution systems. It is compatible with three-phase ganged

and independent phase capable switching devices such as reclosers,

switches, sectionalizers, and breakers. It has up to six standard or low

energy analog (LEA) voltage inputs. The M-7679 R-PAC has a recloser

settings wizard that assists in creating files for most common settings

for recloser applications. The comprehensive I/O matrix provides visual

confirmation of enabled functions and selected outputs, improving security.

Additionally, it includes one of a kind Sensitive Ground Indicator feature to

detect high-impedance faults on the distribution line.

The M‑2067B is an adapter panel which, when combined with the M‑2001

Series Digital Tapchanger Control, provides convenient direct replacement

for Westinghouse SVC and SVR controls and Beckwith Electric M‑0067

series controls. The M‑2067B can also be used, with the M‑2001 Series

Tapchanger Control, as a general purpose LTC transformer control.

Testing Specifications

High Voltage: All input and output terminals will withstand 1500 Vac rms to

chassis or instrument ground for one minute with a leakage current not to

exceed 25 mA, for all terminals to ground. Input and output circuits are

electrically isolated from each other, from other circuits and from ground.

Surge Withstand Capability: All input and output circuits are protected against

system transients. Units pass all requirements of ANSI/IEEE C.37.90.1-1989

defining surge withstand capability.

Radiated Electromagnetic Withstand Capability: All units are protected against

electromagnetic radiated interference from portable communications transceivers

as outlined in ANSI/IEEE C37.90.2-1987 defining radiated electromagnetic 

withstand capability.

• M-2948 Tap Position Sensor directly mechanically replaces the Selsyn-Type Tap

Position Sensor.

• Directly interfaces with a 4 to 20 mA output to the M-2025D Current Loop Interface

which provides the tap position to the M-2001 Series Tapchanger Control.

• Rotation – 0 to 210°, 297°, 306°, 315°, 325°, 330°, 340° and 350° configurations

• Degrees per Tap – 9° or 10°

• Neutrals – 1, 2, 3, 5 or 6

• Rotation Direction – Tap Position Sensors are available with either a positive

or negative rotation. With positive rotation, the shaft of the M-2948 rotates

clockwise while raising taps. With negative rotation, the shaft of the

M-2948 rotates counter-clockwise while raising taps.