Megger OCR15D Manuale utente

1 Part Number 86826

Rev 1 Date 11/6/2019

User Manual

Model OCR15D

and

Model OCR50D

AUTOMATIC CIRCUIT RECLOSER

TEST SETS

It is essential that this instruction book be read thoroughly before putting the equipment in service.

2 Part Number 86826

Rev 1 Date 11/6/2019

Revision History

Revision

ECN #

Date

33728

6 Nov 2019

3 Part Number 86826

Rev 1 Date 11/6/2019

IMPORTANT

This manual, as well as the hardware and software described in it, is furnished under license and

may be used or copied only in accordance with the terms of such license. The content of this

manual is furnished for informational use only, is subject to change without notice. Megger

assumes no responsibility or liability for any errors or inaccuracies that may appear in this

manual.

The information and data in this User Manual are proprietary. The equipment described herein

may be protected by U.S. patents. Megger specifically reserves all rights to such proprietary

information as well as rights under any patent, none of which is waived by the submission of this

user manual.

Except as permitted by such license, no part of this publication may be reproduced, stored in a

retrieval system, or transmitted, in any form or by any means, electronic, mechanical, recording,

or otherwise, without the prior written permission of Megger.

Megger, the Megger logo are trademarks of Megger. All other trademarks are the property of

their respective owners.

Notice to U.S. government end users. The hardware, software and documentation are

“commercial items”, as that term is defined at 48 C.F.R. §2.101, consisting of “commercial

computer software” and “commercial computer software documentation,” as such terms are used

in 48 C.F.R. §12.212 or 48 C.F.R. §227.7202, as applicable. Consistent with 48 C.F.R. §12.212

or 48 C.F.R. §§227.7202-1 through 227.7202-4, as applicable, the commercial computer software

and commercial computer software documentation are being licensed to U.S. government end

users (1) only as commercial items and (2) with only those rights as are granted to all other end

users pursuant to the terms and conditions set forth in the Megger standard commercial

agreement for this software and hardware. Unpublished rights reserved under the copyright laws

of the United States. The recipient, if a Government agency, acknowledges that this manual and

the equipment described were procured with "Limited Rights" to technical data as described in

ASPR 9-203 (b).

The STVI includes an RTOS-resident computer program. This program belongs to Megger and

contains trade secret ideas and information of Megger.

Written and designed at Megger, 4271 Bronze Way, Dallas, Texas 75237.

__________________________

Printed in the USA.

4 Part Number 86826

Rev 1 Date 11/6/2019

SAFETY PRECAUTIONS

WARNING:

VOLTAGES GENERATED BY THIS INSTRUMENT CAN BE HAZARDOUS

This instrument has been designed for operator safety; however, no design can completely protect

against incorrect use. Electrical circuits are dangerous and can be lethal when lack of caution and

poor safety practices are used. There are several standard safety precautions that should be taken by

the operator. Where applicable, IEC safety markings have been placed on the instrument to notify

the operator to refer to the user manual for instructions on correct use or safety related topics. Refer

to the following table of symbols and definitions.

Symbol

Description

Direct Current

Alternating Current

Both direct and alternating current

Earth (ground) Terminal. There is a common chassis ground terminal located

on the front panel (see Front panel under Description of Controls.

Protective Conductor Terminal

Frame or Chassis Terminal

On (Supply)

Off (Supply)

Caution, risk of electric shock

Caution (refer to accompanying documents)

WARNING: Under no circumstances should the operator or technician attempt to open or

service any Megger instrument while connected to a power source. Lethal voltages are present

and may cause serious injury or death!

5 Part Number 86826

Rev 1 Date 11/6/2019

SAFETY PRECAUTIONS (Continued)

The following are some specific safety related items associated with the OCR test

systems.

Read and understand all safety precautions and operation instructions before attempting

to use this unit.

This test set should only be operated by specifically trained technicians and engineers

familiar with this type of industrial electrical equipment.

The purpose of this equipment is limited to use as described in this instruction manual.

Should a situation arise that is not covered in the general or specific safety precaution

please contact Megger regional representative or Megger, Dallas Texas.

Safety is the responsibility of the user. Misuse of this equipment can be extremely

dangerous.

Always start with the main power OFF, before connecting the power source.

Make sure outputs are off before attempting to make test connections.

Never connect the test set to energized equipment.

Always use properly insulated test leads. The optional test leads are rated for

the continuous output ratings of the test system, and should be properly used

and cared for. DO NOT use cracked or broken test leads.

Always turn the test system off before disconnecting the power cord.

DO NOT attempt to use the unit without a safety ground connected.

DO NOT attempt to use the unit if the power cord ground prong is broken or

missing.

DO NOT use the test set in an explosive atmosphere.

The instrument must only be used by suitably trained and competent persons.

Observe all safety warnings marked on the equipment.

For safety related or other important topics, like the statement below, will be

notated with the adjoined symbol. Read the topic carefully as it may relate

either to the safe operation of the test system or the safety of the operator.

Under no circumstances should the operator put their hand or tools

inside the test system chassis area with the test system connected to a

power source. Lethal voltages are present and may cause serious

injury or death!

6 Part Number 86826

Rev 1 Date 11/6/2019

This test set includes a resident computer program.

This program belongs to Megger and contains trade secret ideas and information of Megger.

To the extent this program contains ideas, Megger intends to protect and enforce it rights under state law.

To the extent the program is deemed to constitute a form of expression of an idea, Megger intends to

protect and enforce its rights under the Copyright Act of 1976. The Statutory Copyright notice has been

affixed hereto in the event that it is later determined that the program has been published within the

meaning of the Copyright Act of 1976.

It is essential that this instruction book be read thoroughly before putting the equipment in service.

7 Part Number 86826

Rev 1 Date 11/6/2019

TABLE OF CONTENTS

I. General Description

II. Safety Precautions

III. Input Circuit

IV. Output Circuit

V. Description of Controls

VI. Test Procedures

A. Series Type Reclosers

1. Minimum Pick-up Test

2. Timing Test

B. Testing Vacuum Type Reclosers

C. Reclosers Requiring Line Voltage for Closing

D. Sectionalizers

8 Part Number 86826

Rev 1 Date 11/6/2019

I. GENERAL DESCRIPTION

The Megger Model OCR15D and OCR50D are high current primary injection test

sets designed for testing automatic oil and vacuum circuit reclosers and other

current actuated devices. These units incorporate a variable high current ac output

with an impedance matching network to stabilize the output current. The unit

provides appropriate instrumentation and control circuitry to monitor contact

closure, opening and provide timing functions.

II. SAFETY PRECAUTIONS

WARNING

Potentially lethal voltages can be present on the output leads when the test

set is in operation. The operator is responsible for ensuring the safety of all

personnel during operations. While conducting tests, keep all personnel at a

safe distance from the test set and the device being tested.

CAUTION

For safety of the operator, it is absolutely essential that the test set be

properly and effectively grounded.

9 Part Number 86826

Rev 1 Date 11/6/2019

III. INPUT CIRCUIT

INPUT VOLTAGE

OCR50D

Due to the output capability (50 kVA continuous for the OCR50D) as well as the

specific applications for which the test set was designed, the test set must be

OCR15D

The Megger OCR15D (15 kVA continuous) is designed to operate from any of

several input voltages in order to accommodate the various voltages encountered

by users in the field. It is necessary to change the input terminal connections to

match the available input voltage. This change is made on a terminal board located

inside the right side access panel. The test set must be disconnected from the

supply source before attempting to change the terminals.

SELECTION OF INPUT LEADS

Due to the wide variation in individual user requirements with regard to wire sizes,

terminations and length of leads, all units are supplied with input socket and

matching plug only. The plug will accept a wide range of wire sizes more than

adequate for the duty required. The power source must have sufficient capacity,

and the input leads must be large enough to maintain RATED input voltage at the

INPUT terminals of the test set. Although the test set is designed to operate

satisfactorily at 95-105% of rated voltage, any drop in voltage below RATED at the

input terminals will result in a proportional decrease in the maximum available

output.

NOTE: To achieve published output currents, the rated input voltage must be

maintained at the test set terminals during the test.

When utilizing maximum output from the test set, the input line currents

may be as high as 400% of nameplate rating. The following table has

been prepared to aid in selecting the proper wire size for the input

leads. To use the table, refer to the following four steps:

10 Part Number 86826

Rev 1 Date 11/6/2019

1. Determine the rated input current from the nameplate on the test set. Be sure

to choose the correct current for the input voltage being used.

2. Multiply this value by four.

3. Determine the length of input lead required. This is in circuit-feet, therefore it

is the one-way distance from the test set to the power source.

4. Select the proper wire size from the table using factors 2 and 3 above.

Input Lead Example:

Step 1 - 100 amperes (from nameplate)

Step 2 - 4 x 100 = 400 amperes

Step 3 - 60 ft. (distance from test to input power source.)

Step 4 - # 2 wire (from Chart)

For safety, a ground wire must be connected to the test set frame. The size

of this conductor should be not less than 1/2 the cross section of the

current carrying input leads (three-wire sizes less) and in no event smaller

than #10. An audible alarm is sounded if the test set is not properly

grounded.

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