Greenlee Greenlee CT-300 Manual

®

ClearTest

TRANSFORMER TESTER CT-300

WITH AUTOMATIC SELF TEST

Operating & Instruction Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

ClearTest

Transformer Tester

SAFETY

WARNING: The ClearTest T
on equipment known to be deenergized and/or discharged.

CAUTION: Using the ClearTest Transformer Tester on the secondary side
of transformers may generate high voltages on the primary side. Stay clear
of all primary connections while testing.

OPERATIONAL IMPAIRMENT: If the CT-300 is used in a manner not
described in this instruction manual, the protection and effective operation
of this equipment may be impaired.

ransformer Tester shall only be used

2

INTRODUCTION

The CT-300 ClearTest Transformer Tester is a versatile tool for quick and
easy checks of transformers and the connections made to them. The
transformer connections can include bundled secondaries or a cable
run from the transformer to the meter.

In the field, the CT-300 is used to test the primary and secondary sides of
new or reworked, deenergized single or three phase transformer installations.

In the shop the tester is used for quick screening of incoming and outgoing
transformers (including their internal fuses and breakers). It tests both 1Ø
and 3Ø transformers including PT’s and other instrument transformers.

HOW IT WORKS

The CT-300 is used in the field for testing connected transformers and their
connected primary and secondary leads for both shorts or opens. Unlike
a simple ohmmeter, the CT-300 measures transformer winding inductance
and can differentiate true shorts from other low resistance windings or
connected equipment such as meters.

NOTE: The CT-300 will detect most typical transformer defects including
partially shorted windings such as turn-to-turn or layer-to-layer which
result in an improper ratio.

BEFORE TESTING:

1. DO NOT CONNECT TO ENERGIZED EQUIPMENT

2. REMOVE SECONDARY LOAD

3. REMOVE ALL PRIMARY UNDERGROUND CABLES

4. PRESS AND HOLD TEST BUTTON FOR EACH CONNECTION - DO
NOT HOLD THE TEST BUTTON FOR MORE THAN ONE CONNECTION

TESTING THE CLEARTEST TRANSFORMER TESTER

The CT-300 will automatically perform a complete self-test of the batteries,
lights, beeper and all electronics when you press and hold the TEST button
and is indicated by all lights and the beeper turning on. This self-test
takes about one second to complete, after which the tester will begin
testing whatever the leads are connected to. This self-test checks
everything except for the test leads and internal fuse. To test the leads
and fuse, short the test leads together and press the TEST button.
A SHORT light after completion of the normal self-test indicates that
the leads and fuse are good.

If the unit fails to operate, check or replace both batteries. If this self-test
sequence is not completed, the unit will not perform any further testing
and must be returned to the factory for service.

3

USING THE CT-300

For single phase transformers,
use these figures as guidelines
to get started. For 3Ø transformers,
refer to the following page.

When all connections are proper and
the transformer itself is good, the
CT-300 will beep and show OK. The
OPEN indication light indicates a bad
connection or an open transformer
winding. A SHORT light indicates
a short from phase to neutral or
phase to phase in the transformer
or the connections to it.

NOTE: Disconnect primaries or remove
primary fuses before testing secondaries.

RESULTS:

OK: Transformer coil is OK

with no shorts or opens.

SHORT:Transformer has internal

short or load is connected.

OPEN: Check connections. Transformer

coil is open or check for blown
fuse or breaker.

As a quick test in the shop, the CT-300
can be used to screen transformers by
checking both primary and secondary
windings and connections. Test for
SHORTs on both primary and secondary
windings and from primary to secondary.
Test for OPENs on both primary and
secondary windings to check for open
windings or open breakers and fuses.

This instrument is intended
for quick and simple testing of
transformers and the connections
made to them. Do not energize
visibly damaged equipment such
as a leaking transformer even if
the CT-300 indicates OK.

4

Test Connections for CT-300

Remove secondary ground strap to

verify primary isolated from secondary

with OPEN indication.

For 3Ø transformers, the CT-300 test

X1

X2

X3

X0

Y Connection

H0

H1

H2

H3

X0

X1

X2

X3

Primary Secondary

H3H1

H2

Delta Connection

leads are connected from each phase
to neutral and across each pair of
phases. When all connections are
proper and the transformer itself is
good, the CT-300 will beep and show
OK. The OPEN indication indicates
a bad connection or an open transformer
winding. A SHORT indication indicates
a short from phase to neutral or phase
to phase in the transformer or the
connections to it.

For Y (wye) connections, test the primary and
secondary sides of the transformer as follows:

X1 - X2 OK
X2 - X3 OK
X1 - X3 OK
H1 - H2 OK
H2 - H3 OK
H1 - H3 OK
H1 - H0 OK
H2 - H0 OK
H3 - H0 OK
H1 - X1 Transformer OK if both H0
H2 - X2 and X0 are grounded,

}

H3 - X3 otherwise OPEN
H0 - X0 SHORT, if both sides are

grounded, otherwise OPEN

For ⌬(delta) connections, test the primary
and secondary sides the same as the Y (wye)
except omit the connections to X0 and H0.

5

TESTING DISTRIBUTION VOLTAGE REGULATORS

load to ground

OK

line to load

regulator at neutral

SHORT

line to ground

OK

For typical distribution voltage regulators, test using
these figures as guidelines. Both the line and load
bushings tested to ground should indicate
the reading shown in the figures. With the
regulator in the neutral position, the line
and load are internally connected with
the resulting test indicating SHORT.

TESTING DISTRIBUTION
TRANSFORMERS FROM
METER SOCKETS

An overhead or underground distribution
transformer can sometimes be more conveniently
tested from a meter socket served by that transformer.

The CT-300 shall only be used on equipment
known to be deenergized. Test both the load
and source sides of the meter socket for the
presence of voltage before using the CT-300.

Using the CT-300 on the secondary side of
transformers may generate high voltages
on the primary side. Stay clear of all primary
connections while testing. The CT-300 will
test the secondary side of a transformer
connected to the meter socket. Connect the
CT-300 across the two source side receptacles
and from each receptacle to ground and test.

NOTE: This procedure will not work if other loads
are connected to the same transformer.

The wiring on the load side of the meter socket
going into the main breaker can also be tested
for shorts or crossed phases. Connect the CT-300
across the two load side receptacles and from
each receptacle to ground. The absence of shorts
or crossed phases will be indicated by an OPEN
reading. If the main breaker is not open,
connected loads within the building may cause
a SHORT or OK indication.

The meter socket connections shown are typical.
Local standards may specify different connections.

6

S

OURCE

S

IDE

(

TY PI C AL

L

OADSIDE

(

TY PI C AL

)

)

BATTERY REPLACEMENT

The CT-300 is powered by two 9V lithium or alkaline batteries. They are
easily and quickly replaced by removing the battery cover on the back of
the unit. Always replace the two batteries together.

NOTE: For user safety there is a non-replaceable 600V internal fuse inside the
instrument. If the instrument is connected to an energized transformer, the
fuse will blow. The instrument must then be returned to the factory for repair.

DIMENSIONS

4.0 in. W x 7.8 in. L x 2.3 in. H (10.1 cm x 19.5 cm x 5.9 cm)

WEIGHT

1.6 lbs, (727 g)

BATTERY

9V alkaline 1604A, IEC 6LR61 or 9V lithium ANSI-1604LC
SHORT: Power factor < 0.3 to 0.5, current dependent

OPEN: Current < 10 µA
TRANSFORMER OK: Power factor ≥ 0.3 TO 0.5, current dependent

ENVIRONMENTAL CONDITIONS

CONDITIONS: Indoor and outdoor use
ALTITUDE: Up to 6,566 ft. (2000M)
OPERATING TEMPERATURE: -20°F to +140°F (-29°C to +60°C)
HUMIDITY: 95% to +60°C (non-condensing)
POLLUTION DEGREE: PD2

ENCLOSURE MATERIAL: ABS UL 94-HB
PRINTED CIRCUIT BOARDS: FR-4 UL 94-V0

7

HD Electric Company is herein referred to either as “HDE” or “Seller” and the customer or person or entity purchasing goods or services (hereinafter collectively referred to as “Goods”) is referred to as the “Buyer”. These
Termsand Conditions,any price listor schedule,quotation, acknowledgment orinvoice from HDErelevant to thesale of the Goodsand all documentsincorporatedby specificreference therein,constitutethe completeand
exclusivestatement of theterms of the agreementgoverning the sale of Goodsby HDE to Buyer. Buyer’sacceptance of the Goodswill manifest Buyer’sassent to these termsand conditions withoutvariation or addition.
Anydifferent or additionalterms in Buyer’spurchaseorder or other Buyerdocuments arehereby objectedto. HDE reservesthe right in its solediscretion torefuse orders.

1. PRICES AND TAXES: Unlessa fixedprice is quoted, the price at whichthis order is accepted is subjectto adjustment to HDE’sprice in effect at the time of order.Any current or futuretax or governmental charge(or
increase in same) affecting Seller’s costs or production, sale or delivery or which Seller is otherwise required to pay or collect in connection with the sale, purchase, delivery, storage, processing, use or consumption of Goods
(butexcluding any taxon Seller’s netincome or profit)shall be for Buyer’saccount and shallbe added to theprice.

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agreements with the Buyer in the event Buyer fails to make any payment when due, which other agreements Buyer and Seller hereby amend accordingly, or HDE otherwise deems itself insecure. Buyer shall be liable for all
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4. HDE LIMITED WARRANTY:HDE covers itsproducts with amanufacturer’s warrantyagainstdefects in materialor workmanshipfor a period of ten yearsin the case ofCapacitor Controlsand in all other circumstances
for a period of one year, unless otherwise stated by HDE in writing. To take advantage of this warranty, the complete product must be delivered prepaid to HDE or any HDE Authorized Service Center. This warranty shall
notapply to anyGoods includingbut notlimited to productswhich:(a) Have beenrepairedor altered outsideHDE’s factory(or AuthorizedServiceCenter) orin any mannerso as, inHDE’s judgment,to affectits serviceability
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ANDBUYER’S EXCLUSIVEREMEDY WHETHERSOUNDINGIN TORT, CONTRACT,STRICTLIABILITY OROTHERWISE, EXCEPTAS OTHERWISEEXPRESSLYSET FORTH INTHIS AGREEMENT.THERE ARE
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13. COMPLIANCE:Seller/Contractorshall comply withall applicable federal,state or local laws, rules, regulations,or orders. Seller/Contractor shall complywith Executive Order 11246,as amended by Executive Order

11375, and the applicable provisions of the Office of Federal Contract Compliance Programs (OFCCP), 41 CFR Part 60, which are incorporated herein by this reference. Buyer shall comply with all applicable federal, state,
orlocal laws, rules,regulationsor ordersincluding butnot limitedto the ForeignCorrupt PracticesAct of1977, as amended.HDE reservesthe rightto delay orrefuse deliveryif requestsfor reasonableassurancesof Buyer’s
complianceare not tenderedas requested.

14. MISCELLANEOUS:These termsand conditionssupersedeall othercommunications,negotiationsand priororal orwritten statementsregardingthe subjectmatter hereof.No change,modification,rescission,discharge,
abandonment, or waiver of these terms and conditions shall be binding upon HDE unless made in writing and signed on its behalf by its duly authorized representative. No conditions, usage or trade, course of dealing or per­formance,understandingor agreementpurporting tomodify, vary,explain, or supplementthese termsand conditionsshall be bindingunless hereaftermade in writingand signedby Seller. No modification shallbe effected
by HDE’sreceipt or acceptanceof Buyer’s purchaseorders, shippinginstruction forms,of other documentationcontainingterms at variance withor in addition to thoseset forth herein,all of which are objectedto by HDE.
Anysuch modificationsor additionaltermsare specificallyrejectedby HDE. No waiverby HDEwith respectto any breachor defaultof any rightor remedy andno courseof dealing, shallbe deemedto constitutea continuing
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applyto this agreement.

16. CLASS ACTION WAIVER:BINDING ARBITRATION MUST BE ON AN INDIVIDUALBASIS. THIS MEANS NEITHER BUYER NOR SELLER MAY JOIN OR CONSOLIDATE CLAIMS IN ARBITRATIONBY OR
AGAINST OTHERS, OR LITIGATE IN COURT OR ARBITRATE ANY CLAIMS AS A REPRESENTATIVE OR MEMBER OF A CLASS OR IN A PRIVATE ATTORNEY GENERAL CAPACITY. ADMINISTRATION OF AR­BITRATION:The binding arbitrationmust be administeredby the American ArbitrationAssociation (“AAA”) in accordancewith its Commercial ArbitrationRules and/or SupplementaryProcedures for Consumer-Related
Disputes(including proceedingsto mitigate costs of travel).This binding arbitrationis governed by the Federal Arbitration Act (“FAA”) (9 USC §1,et. seq.) and will govern the interpretationand enforcement.The binding
arbitrationshall be held at a locationdetermined by AAA or at such otherlocation as mutually agreed.In addition to the termsstated above, the followingwill apply to the binding arbitration: (1) the arbitrator,and not any
federal,state, or localcourt or agency,will have exclusiveauthorityto resolve anydispute relatingto the interpretation,applicability,enforceabilityor formationof this Agreementincludingany claim thatall or any part ofthis
Agreement is void or voidable; (2) the arbitrator shall apply Illinois law consistent with the FAA.

TERMS AND CONDITIONS OF SALE

HD Electric Company is committed to ongoing review and improvement of its product lines,

and thus reserves the right to modify product design and specifications without notice.

HD Electric Company®products are available through HDE®sales representatives worldwide.

HD Electric products receive final assembly and shipment from HDE's production facility at

Suite 400 - 4320 Executive Drive, Southaven, MS 38672.

HD Electric Company is ISO 9001:2015 certified

Printed in U.S.A. © HD Electric Company 2020 • Bulletin No. CT-300 IM-200a