Features

Some installations of the M-2001 series Tapchanger Control

may experience interposing relay buzzing, chatter (severe

buzzing), or in extreme cases, lock-up and runaway tap

changer operation.With sensitive coil configurations, even

though the pull-in current is usually in excess of 10 mA, the

“maintain” or “holding” current can be as low as 1-2 mA.

At that level, the leakage current from protective components

in the M-2001 series control, can cause the relay armature to

buzz or lock-up the interposing relay. Adding shunt resistance

to each of the output relay circuits will minimize the

interposing relay’s sensitivity to small leakage currents,

thereby eliminating the relay buzz, chatter, and lock-up.For

this reason, the B-2048 Resistor Assembly is provided with

some adapter panels.

Application

Distribution Protection

Specifications

Buy America(n) Qualified

Contact Manufacturer

Dimensions

Weight

.5 lb.

General

UPC

096359816379

Line Current, used for Line Drop Compensation, is provided by an Auxiliary

Current Transformer. The current transformer drops the line current to a

0.2 A full scale rating. The M 0121 or M 0169A can be used for CTs with

a 5 A secondary. The M 0169A can be used for CTs with either a 5 A or

8.66 A secondary.

Input

M‑0121: Nominal 5 A current transformer circuit.

M‑0169A: Nominal 5 A or 8.66 A current transformer circuit.

Output

Nominal 0.2 A ±5%, linear to 0.4 A.

Output Rating

M‑0121: (into M‑0067 terminals 3 to 4 or 5 to 6) 0.1 VA, 0.2 A current.

M‑0169A: 5 VA, 0.2 A current.

HI POT: 1500 Vac rms. Primary to secondary and either to case.

Mounting Dimensions

M‑0121: 5″ x 2‑1/8″ (12.7 cm x 5.1 cm), 4 holes, 7/32″ (0.6 cm) diameter.

M‑0169A: 5‑5/8″ x 3″ (14.3 cm x 7.6 cm), 4 holes, 7/32″ (0.6 cm) diameter.

Compliance

cULus‑Listed per 508 – NMTR.E155037 Industrial Control Equipment

– NMTR7.E155037 Industrial Control Equipment Certified for Canada

CAN/USA C22.2 No. 14‑M91

• Terminals are brass studs No. 10-32 with one lock washer, flat washer,

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 secondary to protect the

transformer

• The M-0404 is primarily intended to transform 69 Vac control voltages

to 120 Vac for operation with most Load Tapchanger controls

• Alternately, it may be useful (at reduced VA capabilities) of

transforming 208 Vac nominal control voltage to 120 Vac by

reversing the primary and secondary connections

• Each transformer includes two plastic terminal covers

• Approximate weight: 7.75 lbs

Introduction

The M‑0329B Backup Control offers reliable voltage protection from both

improperly set and malfunctioning Tapchanger controls. The most common

voltage error in setting tapchanger controls occurs when values of Line Drop

Compensation are set in the tapchanger control that result in unexpectedly

high voltage at the transformer due to higher than anticipated load currents.

Modern digital tapchanger controls typically offer Upper and Lower Voltage

Limits in the form of Block Raise and Block Lower Setpoints, and can provide

runback, as in the M‑0329B. However, the M‑0329B is a stand‑alone, line

voltage operated, analog device that keeps operating regardless of the

condition of the main control’s processor and/ or internal power supply.

The M‑0329B has bandcenter and bandwidth settings, similar to the primary

tapchanger control. In the majority of applications, the bandcenter should be

set to the same numerical voltage value as the primary control. The bandwidth

of the M‑0329B should be set to at least twice the numerical value of the

bandwidth setting of the primary control. The band edges of the M‑0329B’s

bandwidth are the Upper and Lower Voltage Limits, (also known as Block Raise

and Block Lower), beyond which, the M‑0329B prohibits Raise and Lower

commands from the primary control from energizing the tapchanger motor.

The M‑0329B also has a “Deadband” setting. This is a voltage band of 1. 2. 3.

or 4 Volts, and this value is selected by setting dip switches on the side of the

M‑0329B. The lower edge of the Deadband setting begins at the Upper Voltage

Limit of the M‑0329B. The upper edge of the Deadband is referred to as the

“Voltage Runback Threshold”. When the measured voltage exceeds this threshold

due to load shedding or some other external event (the tapchanger is already

blocked at this point), the M‑0329B can issue its own Lower command.

How quickly this occurs is determined by the time delay setting on the M‑0329B,

which is settable from 1 to 30 seconds. Once this Force Lower command is issued,

the M‑0329B will not cancel the command until the measured voltage is below

the upper edge of the Deadband (Voltage Runback Threshold).

If, for some reason, the voltage remains above the Voltage Runback Threshold

(an inoperative tapchanger), the M‑0329B will time out for 180 seconds (3 minutes)

and then close an Over‑Voltage Alarm contact. It may be helpful in setting the

M‑0329B to adjust the bandwidth setting and Deadband such that the Voltage

Runback Threshold matches the maximum allowed system voltage, so that the

over‑voltage alarm corresponds with the actual maximum value.

It is also helpful to consider setting the M‑0329B bandwidth to accommodate the

maximum amount of anticipated Voltage Reduction (if used). To accommodate

the maximum voltage reduction and the maximum allowable voltage, it is

sometimes necessary to skew the bandcenter setting of the M‑0329B to

accommodate both. Consult the factory if you are unsure how to determine the

value for a skewed bandcenter.

• Prevents a defective LTC tapchanger control from running the voltage

outside the upper or lower limits

• Prevents the line drop compensator from raising the voltage too high

under full or overload conditions

• Fully transient protected and operates within ±1% voltage accuracy

over a temperature range of -40° to +80° C

• Includes First Customer Protection

Features

Block Raise and Block Lower voltage levels are set by accurately calibrated

Bandcenter and BANDWIDTH controls, similar to those found on LTC transformer

controls.

BLOCK RAISE/LOWER and LOWER LEDs indicate backup control status.

Block Raise, Block Lower, Lower and Alarm contacts provide outputs to drive

external components.

Where Should You Use the M–0001 Battery Transient Suppressor?

Use on the equipment side of battery fuses.

Why? A lightning stroke may last as long as a second. If the fuse blows early in the

stroke, no suppressor will help if it is on the wrong side of the fuse.

Use one suppressor for each piece of equipment to be protected.

Why? A number of suppressors can drain off the transient energy into many paths,

thereby reducing the possibility of a fuse blowing. Many suppressors cost far less

than the damage that can be caused by a single lightning stroke.

Even so, a single suppressor was installed many years ago at a substation where

a direct lightning stroke occurred. Although the suppressor was damaged, it

protected a costly fault recorder.

Use within a few feet of the equipment to be protected.

Why? Lightning sets up high frequency resonant voltages in the battery leads.

The suppressor will clamp the voltages near the equipment.

Use in place of a capacitor-type transient suppression from battery leads to ground.

Why? Control batteries are ungrounded to permit a single ground to be detected

and an alarm given without causing a relay to trip. Capacitors connected to ground

from the battery leads will discharge through auxiliary relays and can cause a breaker

to trip on a single momentary ground.

• Will not induce accidental circuit breaker tripping

• Zener diodes precisely limit the voltage to prevent reverse flow of battery

current as soon as the transient is over

• Can be used on 24. 48 or 125 V batteries

Protect Against Lightning and Switching Transients and Avoid Costly Service

Interruption and Equipment Damage.

Why Should You Use the M–0001 Battery Transient Suppressor?

Lightning strokes may flow through battery and control leads seeking a path

to ground.

Ground faults from a power conductor can result in thousands of amperes

flowing until circuit breakers operate.

Transients induced by opening air disconnects can create high frequency energy

through the conductor from the switch to the first open breaker. The conductor

will then act as an antenna when it is energized or de energized, with the arc

acting as a signal generator. The energy will be received by any nearby conductor.

Opening or closing a circuit breaker, especially when a power line is being switched,

can cause the line to absorb the high frequency energy which can radiate to other

conductors in a switchyard.

Caractéristiques Environnementales

Plage de Température d’Utilisation: Les précisions indiquées sont maintenues

entre ‑40 ° et +80 °C.

Humidité: Les précisions indiquées sont maintenues jusqu’à 95 % d’humidité

relative (sans condensation).

Résistance aux Moisissures: Carte de circuit imprimé à revêtement enrobant

qui empêche la formation de moisissures.

Caractéristiques Physiques

Dimensions: 25.40 cm de hauteur x 16.19 cm de largeur x 11.35 cm de

profondeur (10 po x 6‑3/8 po x 4‑15/32 po). Avec l’adaptateur de montage en

saillie M‑0124. la profondeur maximale est de 11.59 cm (4‑9/16 po).

Poids Approximatif : 2.7 kg (6 lb).

Poids à l’Expédition Approximatif : 3.4 kg (7‑1/2 lb).

Protection Contre les Courants Transitoires

Les circuits d’entrée et de sortie sont protégés contre les courants transitoires.

Le M–0115A ne présente ni défaillance de composant ni commande

intempestive lorsqu’il répond aux exigences de la norme ANSI/ IEEE

C37.90.1-1989 qui définit l’aptitude à résister aux surtensions oscillantes

et transitoires rapides.

Toutes les entrées et sorties doivent supporter 1500 V c.a. au châssis ou à

la masse de l’instrument pendant une minute. Les tensions d’entrée sont

électriquement isolées l’une de l’autre, des autres circuits et de la terre.

Montage

Montage sur panneau avec découpe de 21.59 cm x 15.56 cm (8‑1/2 po x

6‑1/8 po). Montage en saillie grâce à l’adaptateur de montage en saillie

M‑0124

Courants Nominaux

Chacun des enroulements K1. K2 ou ACT de la borne TB1–1 à la borne 

TB1–5 a une valeur nominale de 0.2 A en continu.

Tous les enroulements doivent résister à ce qui suit : 0.4 A en continu,

2.9 A pendant 5 s ; 3.3 A pendant 4 s ; 4.0 A pendant 3 s ; 5.0 A pendant 2 s.

Les noyaux sont insaturés sous une charge de 12 VA.

Rélage de la Sensibilité

Le réglage de la sensibilité empêche les transformateurs changeurs de

prise en charge de pomper ou d’être à plusieurs positions d’écart.

La sensibilité est réglable de deux fois la normale à 0.5 fois la normale en

neuf étapes.

Commutateur Parallèle/Indépendent

Un commutateur permet de sélectionner le mode de commande des

transformateurs changeurs de prise en charge.