Le module d’équilibrage en parallèle M-0115A comporte tous les composants

à ajouter à un transformateur changeur de prise en charge pour sa mise en

parallèle par la méthode du courant circulant.

Le module d’équilibrage en parallèle M‑0115A comporte tous les composants

à ajouter à un transformateurchangeur de prise en charge pour sa mise en

parallèle, par la méthode du courant circulant.

Un réglage de la sensibilité du courant circulant permet au M‑0115A d’éviter

les problèmes de pompage (du fait d’une sensibilité excessive), ou permet

aux transformateurs d’être à plusieurs positions d’écart (du fait d’une

sensibilité insuffisante).

Le M‑0115A est conforme à la procédure décrite dans la norme ANSI

C57.12.10‑1988. paragraphe 10.2.

Alimentation Électrique

Nominale de 0.2 A, 12 VA, 50/60 Hz.

Using the M‑0115A with Existing Equipment

The M‑0115A Parallel Balancing Module can be ordered with new equipment from

most transformer manufacturers or added to existing transformers. If the Module is

added to existing equipment, the following factors should be considered:

• If the old control uses a 5 A input for the line drop compensator, a new control must

be installed to provide the required 0.2 A load and circulating current inputs.

A Beckwith Electric M‑2001C/D Tapchanger Control is recommended for this application.

• The M‑0115A is designed for use with 200 mA = 1 P.U. system currents. If only 5 A

currents are available, then a suitable 5 A:0.2 A Auxiliary Current Transformer, such as

the Beckwith Electric M‑0169A, is recommended.

• If phase‑to‑phase voltage is used, two current transformers are used to derive a

current in phase with the voltage. Connection must be made to Terminal 5 of the M‑0169A

instead of Terminal 1.

Only required with M‑0067E, M‑2001C/D have a Phase Angle Correction Setting for this

condition.

• Refer to the paralleling diagrams in the LTC Comprehensive System Manual for the

following conditions:– If circuit breakers such as the “52 Line Breaker(s)” and the “24

Tie Breaker(s)” as shown in the paralleling diagrams are present, then their auxiliary

contact connections should be included as shown to ensure proper automatic transfer

from parallel to independent operations. Please note that auxiliary breaker contacts

are shown in the parallel mode with all breakers closed.

– If these breakers do not exist, and for example, only one common load breaker is

used, the circuit should be wired to make a circuit where the normally closed contacts

are shown. No circuit should be made where the normally open contacts are shown.

• If paralleling and hand‑operated load switches are used:

a. AUTO/MANUAL switches on the M‑2270. M‑2278. M‑2280. and other Beckwith

Electric adapter panels should be placed in the MANUAL position.

b. Other controls should be placed in the MANUAL position.

c. The M‑0115A PARALLEL/ INDEPENDENT switch should be placed in the

INDEPENDENT position before the load switches are operated (see CAUTION).

Environmental

Temperature Range: Stated accuracies are maintained from ‑40° to +80° C.

Humidity: Stated accuracies are maintained at up to 95% relative humidity

(non‑condensing).

Fungus Resistance: A conformal printed circuit board coating inhibits fungus

growth.

Terminal Block Connections/Torque Requirements

The M‑0115A Parallel Balancing Module is listed to UL Standards for Safety by

Underwriters Laboratories Inc. (UL). The wire should be No. 22–16 AWG inserted

in an AMP #36157 (or equivalent) connector, and the screws tightened to 4.8

inch‑pounds torque.

Physical

Size: 10″ high x 6 3/8″ wide x 4 15/32″ deep (25.40 cm x 16.19 cm x 11.35 cm).

When using the M‑0124 Surface Mounting Adapter, maximum depth is 4 9/16″

(11.59 cm).

Approximate Weight: 6 lb (2.7 kg).

Approximate Shipping Weight: 7 1/2 lb (3.4 kg).

Warranty

The M-0115A unit is covered by a five year warranty from time of purchase.

Beckwith Electric M‑2025B Current Loop Interface Module: This device accepts

the current loop output and properly scales it by the use of an external resistor.

It also is configured by a jumper to select a unipolar or a bipolar current loop

input. It provides an analog voltage output to the M‑2001 Series Control that

tracks the analog current output of the Tap Position Monitor.

The lowest analog dc voltage corresponds to the lowest tap position number

and the highest dc voltage corresponds to the highest tap position number. 

Tap Position Monitor: This device compares voltages from the stator windings

of the Selsyn transmitter to determine the rotor position.

The position information is converted to a tap position number and is usually

displayed on the front of the unit. This device includes an analog current output

that corresponds to the displayed tap position.

Sensitivity Control

Sensitivity adjustment prevents LTC transformers from hunting or being several

steps apart.

Sensitivity is adjustable from two times normal to 0.5 times normal in nine steps.

Parallel/Independent Switch

Mode of LTC control is switch selectable.

Transient Protection

Input and output circuits are protected against system transients. The M‑0115A

will exhibit no component failure or false commands when subjected to the

requirements of ANSI/IEEE C37.90.1-1989. which defines oscillatory and fast

transient surge withstand capability. All inputs and outputs will withstand 1500

Vac to chassis or instrument ground for one minute. Voltage inputs are electrically

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

Mounting

Panel mounted using 8‑1/2″ x 6‑1/8″ cutout (21.59 cm x 15.56 cm). May be

surface mounted using the M‑0124 Surface Mounting Adapter.

Application

This manual includes an overview of typical system setup and connections, necessary

components, and the information necessary to implement a paralleling scheme using

the M‑0115A in the Circulating Current paralleling method.

Provides all components that are required for paralleling LTC Transformers

using the Circulating Current Method

The M‑0115A Parallel Balancing Module includes all the components that

must be added to load tapchanging (LTC) transformers to permit them to

operate in parallel, using the circulating current method. The transformer

controls must have a 0.2 A input for load and circulating current. Through

the use of a circulating current sensitivity adjustment, the M‑0115A avoids

the problems of hunting (caused by too much sensitivity), or permitting

the transformers to be several steps apart (caused by too little sensitivity).

The M‑0115A conforms to the procedure described in ANSI C57.12.10‑1988.

paragraph 10.2.

Current Inputs

Rated at 0.2 A, 12 VA, 50/60 Hz.

Current Ratings

Either winding K1. K2 or ACT from terminal TB1‑1 to TB1‑5 is rated for 0.2 A

continuous.

All windings will withstand the following: 0.4 A continuous, 2.9 A for 5 sec;

3.3 A for 4 sec; 4.0 A for 3 sec;

5.0 A for 2 sec.

Cores are unsaturated at 12 VA burden.

Incon 1250 Series Rotary Position Indicator

Another configuration commonly encountered is the Selsyn position indicator

(Figure 2). These tap position sensors are traditionally used with a Tap Position

Monitoring device such as the Incon 1250 series devices.

The Selsyn encoder is an electromagnetic device that resembles a small electric

 motor. Although using various configurations of internal windings, they typically

excite rotor winding(s), and induce AC signal voltages in the stator windings

which can be compared in amplitude and polarity to determine the angular

position of the rotor shaft.

The Tap Position Monitor generates the voltage signals supplied to the rotor

winding(s). It then measures the resulting signals from the stator winding to

determine the shaft’s rotational position. This informationis converted to a

tap number and displayed on the front panel numeric readout. An analog

current signal is also generated which corresponds to tap position.

The M-2025D Current Loop Interface module accepts this analog current

signal.

M‑2025D Current Loop Interface Module Applications

Beckwith Electric M‑2001B, M‑2001C and M‑2001D Digital Tapchanger

Controls: The M-2025D Current Loop Interface Module connects to the control

through the included 3-foot B-0753 interface (6 pin to 6 pin) cable.

The control provides low-voltage dc to power the M-2025D and accepts an

analog voltage input as described above. The M-2001 control includes a tap

calibration screen to establish a reference tap position and it allows the current

tap position to be viewed. The B-0753 interface cable is optionally available in

6-ft (B-0753-01), 8-ft (B-0753-02), 12-ft (B-0753-03), 15-ft (B-0753-04), and

25-ft (B-0753-25) lengths and should be ordered as a separate line item if the

included 3-foot length is too short.

Beckwith Electric M‑2001. M‑2001A or M‑2001A‑1 Tapchanger Control: The

M-2025D Current Loop Interface Module connects to the M-2001. M-2001A,

or M-2001A-1 through the B-0752 interface cable (5 pins on one end and 6

pins on the other end). These controls provide low-voltage dc to power the

M-2025D, and accept an analog voltage input as described above.

They also include a tap calibration screen to establish a reference tap position

and it allows the current tap position to be viewed.

• Terminals are brass studs No. 10–32 with one lockwasher,

flatwasher, and regular nut

• The core and coil assembly is encased in a thermoplastic

shell and filled with resin

• It is desirable to use a 1.6 amp fuse in the primary of the

M‑0362 to protect the source transformer

• A circle diagram for the estimation of the errors for other

than rated burdens is provided

• Each transformer includes two plastic terminal covers

• Approximate weight: 7.75 lbs

Specifications

Frequency: 60 Hz

Input Voltage: 120 V

Standard Secondary Voltage: 120 Volts

Insulation Level: 0.6 kV, BIL 10 kV full wave

Accuracy Class: 0.6 W, 1.2 x at 60 Hz

Thermal Rating:

150 VA at 30° amb

100 VA at 55° amb

M‑0362 Voltage Transformer is manufactured to meet the requirements

of ANSI C57.13. Classified by U.L. in accordance with IEC 185.

Patent and Warranty

M‑0362 is covered by U.S. Patents, and carries a five year warranty from

date of purchase.

Current Loop Configuration

The configuration to use Tap Position by Positive Knowledge (Current Loop)

Procedure is shown in Figure 1 and typically includes:

• Tapchanger position output (shaft movement)

• Selsyn Transmitter

• Tap Position Monitor

• M‑2025B Current Loop Interface Module

• M‑2001 Series Digital Tapchanger Control

Tapchanger Position Output (Shaft Movement): Most LTC tapchangers have

an output shaft whose angular rotation and position are a mechanical analog

to the tapchanger tap position. In many cases, the total range of tap positions

is represented by one or two rotations of this shaft.

Selsyn Transmitter: This transmitter is mechanically connected to the

tapchanger position output shaft.

The Selsyn transmitter is an electromagnetic device used for transmitting data

on rotational position. Selsyns, or synchros, as they are sometimes called,

resemble small electric motors. They have various configurations of internal

windings. One or more windings are on a rotor and usually three windings

(stator), are stationary surrounding the rotor. By exciting the rotor windings

with an AC signal, induced voltages in the stator windings can be compared

in amplitude and polarity to determine the angular position of the rotor, relative

to the stator windings.