Beckwith Electric M-0359 SYNCROCLOSER MOD512

The M‑0127A AC Current Relay is primarily designed as a recommended

addition to the Circulating Current or Delta VAr1 Paralleling configurations

used with LTC Transformers. Its purpose is to monitor the current in the

circulating loop between transformers, and interrupt Motor Power to its

monitored transformer, should the circulating current exceed a

predetermined value. The M‑0127A range permits the maximum circulating

current to be set from 5% to 50% of the rated full load current.

Other relays used for this purpose have an impedance exceeding 5.000 Ω

which may cause the main CT to saturate, making the entire circulating

current scheme operate poorly. The low impedance of the M‑0127A relay

avoids this problem.

The output should be connected in series with the common lead of the

automatic control circuit of the motor starter relay. When used with the

Beckwith Electric M‑0067E control, the M‑0127A output contacts will be

in series with the lead that would otherwise have gone directly to terminal

TB1‑8 of the M‑0067E. Polarity of the M‑0127A input and output can be

ignored.

M‑0170A Application

The M‑0170A AC Current Relay is intended to be used in the load current

circuit to prevent the tapchanger from changing taps on excessive load

current. Its range permits the current setting from 100% to 200% of the

rated full load current. The relay is connected in the same manner as the

M‑0127A.

Additional Applications

The M‑0127A and M‑0170A can be used wherever an adjustable, low burden

AC relay is required. They have virtually no time delay, a very small hysteresis

and a normally closed output for use on AC only. The relay output draws

approximately 6 mA of in‑phase current through a 120 Vac load when open.

These factors must be considered for the user’s specific application.

By adding external series resistors, the relays may be used for voltage sensing.

For example, with a 10 K series resistor, the M‑0127A is adjustable from 100 to

140 Vac, using 10 to 14 mA current setting range.

Use of a 10 K, 10 W wire‑wound resistor is suggested.

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.

The M‑2067B permits changing of the M‑2001 control without adapter

panel removal or rewiring.

Applications

• Connects easily to the M‑2001Series Digital Tapchanger Control using

four mounting screws and 24‑pin connector

• Provides mounting adaptable to several different configurations

• Provides built‑in CT shorting protection when the M‑2001 Series Digital

Tapchanger Control is removed

The M‑2053 is an adapter panel which permits M‑2001 Series Digital

Tapchanger Controls to be surface‑mounted while providing access points

for wire terminations.

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.

The M‑2069 Adapter Panel, when combined with the M‑2001C or M-2001D

Digital Tapchanger Control, offers convenient, direct replacement of

Westinghouse SVC or SVR controls and Beckwith Electric M‑0067E controls

or M-2067B adapter panels.

The M‑2069-M-2001D combination can also be used as a general purpose

LTC transformer control.