Simpson Electric Company 01318, 01315, 01319, 01317, 01316 User manual

Current Transformer

Model 186

INSTRUCTION MANUAL

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About this Manual

To the best of our knowledge and at the time written, the information con­tained in this document is technically correct and the procedures accurate
and adequate to operate this instrument in compliance with its original ad­vertised specifications.

Notes and Safety Information

This Operator’s Manual contains warning symbols which alert the user to
check for hazardous conditions. These appear throughout this manual where
applicable, and are defined below. To ensure the safety of operating perfor­mance of this instrument, these instructions must be adhered to.

Warning, refer to accompanying documents.

!

Caution, risk of electric shock.

!

This instrument is designed to prevent accidental shock to the operator when
properly used. However, no engineering design can render safe an instru­ment which is used carelessly. Therefore, this manual must be read carefully
and completely before making any measurements. Failure to follow direc­tions can result in a serious or fatal accident.

Warranty and Returns

SIMPSON ELECTRIC COMPANY warrants each instrument and other articles
manufactured by it to be free from defects in material and workmanship un­der normal use and service, its obligation under this warranty being limited to
making good at its factory or other article of equipment which shall within one
(1) year after delivery of such instrument or other article of equipment to the
original purchaser be returned intact to it, or to one of its authorized service
centers, with transportation charges prepaid, and which its examination shall
disclose to its satisfaction to have been thus defective; this warranty being
expressly in lieu of all other warranties expressed or implied and of all other
obligations or liabilities on its part, and SIMPSON ELECTRIC COMPANY nei­ther assumes nor authorizes any other persons to assume for it any other
liability in connection with the sales of its products.

This warranty shall not apply to any instrument or other article of equipment
which shall have been repaired or altered outside the SIMPSON ELECTRIC
COMPANY factory or authorized service centers, nor which has been subject
to misuse, negligence or accident, incorrect wiring by others, or installation
or use not in accord with instructions furnished by the manufacturer.

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This Instrument is designed to prevent accidental shock to the operator when
properly used. However, no engineering design can render safe an instru­ment which is used carelessly. Therefore, this manual must be read carefully
and completely before making any measurements. Failure to follow direc­tions can result in serious or fatal accident.

3

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Contents

1. GENERAL ......................................................................................... 5

1.1 Current Transformers .......................................................................... 6

2. INSTALLATION .................................................................................. 7

3. MEASUREMENT OF CURRENT OVER 50 AMPS ............................ 8

3.1 Current Transformers For Use With AC Ammeters ............................. 8

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1. GENERAL

The Simpson Model 186 Current Transformer (hereafter referred to as the
Transformer) is designed to enable the measurement of AC current to be (re­motely) taken from the circuit to be measured. Connected in series with a
circuit, the transformer output is designed to produce 0-10 volts over the rated
current range of the transformer primary and a full scale indication on a 0-10
volt, rectifier type AC voltmeter (min. 2000 /V) or a meter relay.

Used with a meter relay, the Transformer can provide a control function based
on the current flowing through the transformer. The transformer secondary is
shunted by a loading resistor (approx. 600 ) to protect the transformer in the
event of loss of the load circuit and to calibrate the transformer for its primary
current rating.

The meter impedance (20,000  min.) is a bridging circuit across the low
impedance secondary which minimizes the reading error introduced by the
secondary-to-meter connecting leads at a distance of up to 500 feet or more,
depending on the wire size (resistance).

A 500 foot run of two (#20 AWG) conductors, for example, would introduce
approximately 10  in series with the 20,000  meter and cause a negligible
(approx. 0.1%) error of the reading.

For current ranges above 50 amps, the Transformer may be used in conjunc­tion with a one-turn primary “donut” transformer.

5

4

3

2

1

0

A.C. AMPERES

RECTIFIER TYPE

6

7

8

9

10

Figure 1-1. Scale.

Typical scale distribution. AC Amperes used with Model 186 Current Trans­formers.

The Transformer should not be used where sustained overloads are possible.
Surge Ratings are found in Table 1-2, Specifications.

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1.1 Current Transformers

Table 1-1. Current Transformers

Range V.A. Burden Catalog No.

500 MA .53 01304
100 MA .50 01295
50 A .54 01321
40 A .42 01319
30 A .37 01318
25 A .53 01317
20 A .48 01316
15 A .37 01315
10 A .50 01314
5 A .40 01312

Any 0-10 VAC rectifier type voltmeter with a sensitivity of at least 2000 per
volt may be scale calibrated to the current range of the Transformer and ob­tained from any Authorized Service Center.

Table 1-2. Specifications.

SPECIFICATIONS:

Ranges Available: Refer to Table 1-1
V.A. Burden: Refer to Table 1-1
Frequency Range: 50-5000 Hz
Accuracy: 2% + accuracy of meter (4% typical) for

sinusoidal voltages at 25°C

Max. Rated Circuit­To-Ground
Voltage*: 750 VAC
Secondary Voltage: 0-10V over the current range of the transformer into

the appropriate voltmeter.

*The highest working voltage, with respect to earth ground, for which the cur­rent winding is insulated.

Max. Surge Current:

CURRENT RANGE MAX. SURGE

.05 to 10a 10X Range

15 to 25A 125A
30 to 50A 50A

Temperature Range:

Operational: –30°C (–22°F) to 60°C (140°F)
Storage: –60°C (–76°F) to 85°C (185°F)

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Construction: Channel flange-mounted open type, varnish-

vacuum impregnated windings on nylon bob­bin. Phenolic laminate terminal board perma­nently attached to the channel. Studs, (1/4-28)
for current winding connections, binding (–32)
head screws for output voltage connections.

2. INSTALLATION

1. The Transformer must be installed and connected by a qualified electri­cian in accordance with provisions of the National Electrical Code.

2. Mount the Transformer using 8-32 screws as near as practical to the
circuit to be measured, keeping it away from heat producing devices.

3. The choice of conductors into which the current coil is to be connected,
depends on the information desired. Connected into the ungrounded
conductor, the meter will indicate the sum of the load current, plus any
ground fault current.

4. Connected into a neutral conductor, the meter will indicate the load cur­rent, but not any ground fault current. Connection into a neutral conduc­tor has the advantage of eliminating any dielectric stress upon the
Transformer’s insulation.

Figure 2.1

5 Conductors to the current-winding must be a wire size and voltage rating

OVERALL

2.81

2.00

1.37

2.43

1.75

Primary Winding
BrassTerminals
1/4 - 28 Studs with 3/8
Nuts AF and Plain Washers

Secondary Winding
Terminals
6-32 Binder Head
(Captive Screws

Secondary
Loading Resistor

0.913

1.12

12

0.75

2.43

PRI

Line Input

Current

Transformer

34

SECONDARY

TO

METER

MOUNTING

2.37
CENTERS

0.18 DIA. MTG. HOLES

that is equal to or higher than conductors in the circuit being measured.

6 Connectors between the Transformer secondary and the meter/relay

should be in accordance with requirements for National Electrical Code,
class 2 circuits. Wire size is not critical for short distances, but should be
as large as possible for distances of 500 feet or more. (See paragraphs 3
and 4, under General Information, page 5.)

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3. MEASUREMENT OF CURRENT OVER 50
AMPS

The Transformer permits remote meter location or meter relay operation from
circuits up to 1000A when used in conjunction with a one-turn primary “do­nut” transformer. The “donut” secondary current must match the current rating
of the Transformer.

LINE IN

1

3

CURRENT X1 FMR

SCHEMATIC

2

4

TYPICAL WIRING ARRANGEMENT

Figure 3-1

LINE IN

12

34

METER RELAY

50mA - 50 Amps

3.1 Current Transformers For Use With AC Ammeters

Insert one-turn primary-type for use with switchboard and panel ammeters
where external transformers are required. Rate at 2 VA. Have 2' leads.

Table 3.1. Transformers for use with AC Ammeters

Amperes

Primary Secondary Catalog No.

50 5 01293
75 5 01306
100 5 01297
150 5 01298
200 5 01299
250 5 01313
300 5 01300
400 5 01305
500 5 01301
600 5 02303
750 5 02459
1000 5 02304

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All Simpson “donut” type transformers have 5 amp secondaries and may be
connected directly to a 5 amp 186 (Catalog No. 01312) Current Transformer.

An iron-vane type 0-5 amp meter may be connected in series with the “donut”
transformer to monitor the current, but the connector’s leads must be kept
very short. A 0-5 amp iron-vane type meter has an impedance of about 0.008
 and it can readily be seen that wire resistance can seriously affect the ac­curacy of the reading. Only the output of the Transformer may be monitored
remotely.
NOTE: The “donut” transformer’s limited frequency response of 50 - 400 Hz
limits the frequency range of this application for the Transformer to 50 - 400 Hz.

VANE TYPE 5 AMP

LINE LOAD

X

DONUT TRANSFORMER

WITH 5A SECONDARY

AC AMMETER

1

2

MODEL 816 CURRENT

TRANSFORMER 5 AMP

PRIMARY CAT. 01312

4

3

METER OR

RELAY

Figure 3-2. Typical wiring arrangement over 50 amps.

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