Megger BM15 Bedienungsanleitung

BM15/MJ15

Insulation Testers

USER GUIDE

GUIDE DE L’UTILISATEUR

GEBRAUCHSANLEITUNG

GUÍA DEL USUARIO

CONTENTS GUIDE DE L’UTILISATEUR - P.14 GEBRAUCHSANLEITUNG - S.26 GUÍA DEL USUARIO - P.38

Safety Warnings 3

General Description 4

Features and Controls 5

Working with Capacitive Loads 6

Operation

Preliminary Checks 7

Battery Replacement 7

Voltage Measurement 8

Insulation Testing 8

Choice of Test Leads 8

Using the Guard terminal 9

Speciﬁcation 10

Accessories 12

Repair and Warranty 13

Before using the instrument, follow the separate instructions provided to ﬁt

either the locking or non-locking test button.

If the locking button is ﬁtted, extra care must be taken. See page 6.

Symbols used on the instruments

FRisk of electric shock.

GCaution, refer to accompanying documents

tEquipment protected throughout by

Double Insulation (Class II)

cEquipment complies with current EU Directives

Do not dipsose of in the normal waste stream

GSAFETY WARNINGS

n‘Safety Warnings‘ and ‘Working with Capacitive Loads‘ must be read and understood before the instrument is used. Safety precautions must

be observed during use.

nThe circuit under test must be switched off, de-energised and isolated before any test connections are made.

nCircuit connections must not be touched during a test.

nOn completion of a test, decaying voltage across the terminals is indicated on the display. Capacitive load circuits must be discharged

to below 60 V before disconnecting the test leads.

nCapacitive load circuits should be shorted with a shorting link after discharge.

nRemove the test leads from the instrument before opening the battery compartment.

nTest leads and crocodile clips must be in good order, clean and with no broken or cracked insulation.

nThe instrument should not be used if any part of it is damaged.

nU.K. Safety Authorities recommend the use of fused test leads when measuring voltage on high energy systems. See ‘Choice of Test Leads‘.

NOTE - The instruments must only be used by suitably trained and competent persons.

NOTE

Users of this equipment and or their employers are reminded that Health and Safety Legislation requires them to carry out valid risk assessments of all electrical work so as to

identify potential sources of electrical danger and risk of electrical injury such as from inadvertent short circuits. Where the assessments show that the risk is signiﬁcant then the

use of fused test leads constructed in accordance with the HSE guidance note GS38 ‘Electrical Test Equipment for use by Electricians’ should be used. See ‘Choice of Test Leads’.

The measurement leads provided with the BM15/MJ15 are rated CAT O, and are to be used for connection to low voltage (<33V) circuits only. Potentially hazardous circuits must

be isolated and veriﬁed as safe using a suitably rated instrument before making any measurement connection using unrated leads. The CAT rating of the instrument is the same as

the lowest rated part in the measurement connection.

CAT II

Measurement category II: Equipment

connected between the electrical outlets

and the user’s equipment.

CAT III

Measurement category III: Equipment connected

between the distribution panel and the electrical

outlets.

CAT IV

Measurement category IV: Equipment connected

between the origin of the low-voltage mains supply

and the distribution panel.

GENERAL DESCRIPTION

BM15, and MJ15 testers are completely self contained instruments

designed for high voltage insulation resistance testing in the maintenance

and servicing of rotating plant machinery, transformers, switchgear and

industrial installations.

Tests can be performed at 500 V, 1000V, 2500 V or 5000 V. Insulation

measuring range is 100 kΩ to 20 GΩ and Inﬁnity. Automatic discharge for

capacitive circuits under test is provided and decaying voltage displayed.

A guard terminal can be used to minimise the effects of surface leakage

when carrying out insulation resistance tests.

Tests are initiated by pressing the BM15 ‘Test’ button (or by turning the

MJ15 generator handle). Releasing the ‘Test’ button (or ceasing handle

rotation) causes the instrument to default to ac/dc voltmeter mode, with

a discharge resistor internally connected across the terminals. This feature

will give decaying voltage indication following the testing of equipment

possessing capacitance.

The moving coil meter operates a black pointer to display the readings on

a single logarithmic black scale on a white scale-plate for clarity of reading.

The movement is resiliently mounted for ﬁeld use.

A slide - in ‘Pass Band‘ overlay can be inserted over the display. Appropriate

Pass/Fail bands can be marked on these windows with a permanent marker

for ‘Go / No Go’ testing.

BM15 is powered by eight 1,5 V (IEC LR6) cells.

Normal power for the MJ15 is by low voltage, hand cranked, brushless

a.c generator. Fitting the battery container supplied, with eight 1,5 V IEC

LR6 cells gives the instrument a dual (independent) supply capability. Both

instruments are ﬁtted with a battery check range, operated by pressing the

‘Test‘ push button. Cranking the handle too slowly (<180 RPM) results in an

unstable pointer reading. Excess handle speed cannot harm the instrument

as the output voltage is electronically regulated.

The case is robust, yet light-weight, made from a ﬂame retardant ABS,

with a polycarbonate display window. Mounted on top of the case is a 6

position, rotary, range selection switch and a ‘Test‘ push button.

Three recessed sockets are provided, and marked ‘+’, ‘-’ and ‘G’. These

have safety covers which open when the plugs are inserted. When inserted

into the sockets, the shrouded test lead plugs lock into position. They are

released by twisting the plug a quarter turn and pulling out.

For this reason, only the test leads supplied or suitable Megger replacement

ones should be used.

Design safety features include:

nExternal voltage, a.c. or d.c., displayed.

nLoad automatically discharged at the end of a test, and decaying

voltage displayed.

nTest leads can lock into the case to prevent accidental disconnection.

FEATURES AND CONTROLS

20G

10G

100M

500

10M

100k

600

400

300

200

100

Test

MEGGERMJ15

MULTI-AMP BIDDLE MEGGER

TM TM

Rotary Selector

Switch

Non Locking Button

(recommended

option)

Locking Button

(Extra care must

be taken if this

option is chosen.

See page 6)

Generator Handle (MJ15)

+ Terminal

Guard Terminal

- Terminal

TO INSERT TERMINAL PLUGS, PUSH IN - TO RELEASE, TWIST A QUARTER TURN AND PULL OUT

1. These instruments are designed to safely charge and discharge

capacitive loads up to 5 µF. To safeguard against malfunction however,

you are advised to take your own precautions when working with

capacitive loads. Remember that when charged, even low value

capacitors can be fatal on contact .

2. Extra care must be taken if the locking Test button is selected.

3. Circuit connections must not be touched when testing.

4. Care must be taken to prevent capacitive circuits becoming

disconnected during a test, leaving the circuit in a charged state.

5. On completion of a test, the instrument indicates circuit decaying

voltage. Do not disconnect test leads until the load capacitance has

discharged to below 60 V.

6. The voltmeter and automatic discharge feature of the instruments

should be regarded as additional safety features and not a substitute

for normal safe working practice.

7. If any part of the instrument is damaged, it should not be used, but

returned to the manufacturer or an approved service organization for

repair.

Circuit connections and the instrument terminals may become

hazardous when connected to Capacitive loads.

WORKING SAFELY WITH CAPACITIVE LOADS

Do not forget to release a locked Test button and discharge

any capacitance before touching the item under test or

disconnecting the test leads.

PRELIMINARY CHECKS

Preliminary Performance Checks

The instrument will operate in any position, but best results are achieved

when the instrument is face up, on a ﬁrm level surface. This is particularly

true for hand cranked units to obtain a crank speed of >180 rev/min.

1) If battery cells are ﬁtted, switch to Battery Check range and press

the ‘Test‘ push button. Conﬁrm that the pointer settles within the

battery symbol portion of the scale.

2) With the test leads disconnected, set the rotary selector switch to the

appropriate insulation range, press and hold down the ‘Test‘ button,

(or turn the generator handle). The meter pointer should move up the

scale brieﬂy and then return to the ‘∞‘ (inﬁnity) position on the scale.

This establishes that there is no leakage through the instrument itself.

3) Check that the test leads and crocodile clips are in good order, clean

and with no broken or cracked insulation. Connect two of the test

leads to the ‘+’ and ‘-’ terminals and ensure that their clips are not

touching anything.

4) Press the ‘Test‘ button again (or turn the generator handle) and

observe the meter pointer. The pointer should rest over the ‘∞‘

position on the scale. If it does not, the test leads may be faulty and

should be inspected more closely for damage. Replace them if

necessary.

5) Connect the test lead clips together, press the ‘Test‘ button (or turn the

generator handle) and observe the meter pointer. The meter should

read ‘0Ω‘. If it indicates inﬁnity or a high resistance value the leads

may be open circuit and should be inspected further. Replace them if

necessary. (Shorting the leads together and obtaining a ‘0 Ω‘ reading

also indicates that the instrument is working).

Battery Replacement

The cells are housed in a battery compartment in the base of the

instrument. To change the cells, use a screwdriver to remove the battery

cover securing screws and lift off the battery compartment cover. Observing

the correct polarity as marked on the battery housing, install 8 replacement

IEC LR6 (AA) cells. Replace and secure the battery compartment cover on

completion.

GWARNING

The battery contacts are not isolated from the test leads. Remove the test

leads from the instrument before opening the battery compartment.

OPERATION

Voltage measurement

When switched to the ‘V’ position, the instrument measures up to 600 V

a.c. to the speciﬁed accuracy of the instrument. DC voltage is also indicated

on the display, but not to the speciﬁed accuracy. When not testing (i.e.

in standby mode) and connected to a live circuit, the instruments default

to voltmeter (0 to 600 Volts a.c. or d.c.) irrespective of the rotary switch

position. Any voltage present will immediately be shown. Thus indication is

given that the item has not been completely de-energized. The instrument

also monitors circuit discharge when the ‘Test‘ button is released following

an insulation test on a capacitive item, e.g. a long cable.

Insulation Testing

After connecting the test leads to the instrument and carrying out the

Preliminary Performance Checks:

1) Set the selector switch to the required test voltage. Connect the test

leads to the isolated circuit to be tested, as follows:-

(a) For insulation tests to earth (ground):- Connect either test

lead to earth (ground) or the frame of the equipment,and

the other lead to that part of the circuit to be tested.

b) For insulation tests between wires:- Connect a lead to the

core of each of the wires.

2) Press the ‘Test‘ button (or turn the generator handle).

3) The meter pointer will indicate the value of insulation resistance on

the Ω scale.

If a capacitive circuit is tested, the pointer will initially deﬂect towards 0 Ω

and then gradually rise to its ﬁnal steady value as the capacitance is charged

up to the output voltage of the tester.

If several successive readings of ∞ (inﬁnity) are obtained, connect the two

farthest ends of the test leads together and carry out a check on the leads.

A 0Ω reading should result which double checks that the leads are not

disconnected or broken and therefore, the insulation resistance readings are

correct.

Capacitive circuits automatically discharge through the tester when the

‘Test‘ button is released. Decaying discharge voltage will be indicated on the

voltage scale. Wait a few moments for the voltage to decay to below 60 V

before disconnecting the test leads.

Choice of Test Leads

BM15/MJ15 are supplied with three unfused leads terminated in crocodile

clips. These are the best leads to use for insulation tests on non-live circuits.

The crocodile clips ensure that any capacitive load remains connected until it

is automatically discharged at the end of a test.

GS 38 (UK Safety Authority Guidance Note) advises the use of fused test

prods if the instrument is to be used for making voltage measurements on

live, high energy circuits. These leads are available as an optional extra. See

‘Accessories’.

Fused prods must not be used for insulation testing. If the fuse should

rupture, or the prods lose contact during a test, the system under test

would remain charged without any apparent evidence of danger!

Do not forget to release a locked Test button, and discharge

any capacitance before touching the item under test, or

disconnecting the test leads.

Using the Guard terminal (G)

For basic insulation tests and where there is little possibility of surface leakage

affecting the measurement, it is unnecessary to use the guard terminal (if

the insulator is clean and there are unlikely to be any adverse current paths).

However in cable testing, there may be surface leakage paths across the

insulation between the bare cable and the external sheathing due to the

presence of moisture or dirt. Where it is required to remove the effect of

this leakage, particularly at high testing voltages, a bare wire may be bound

tightly around the insulation and connected via the third test lead to the

guard terminal ‘G’.

The guard terminal is at the same potential as the negative terminal. Since the

leakage resistance is effectively in parallel with the resistance to be measured,

the use of the guard causes the current ﬂowing through surface leakage to

be diverted from the measuring circuit. The instrument therefore reads the

leakage of the insulator, ignoring leakage across its surface.

OPERATION BLOCK DIAGRAM

to ‘-’ve

terminal

20G

10G

100M

500

10M

100k

600

400

300

200

100

Test

MEGGERBM15

MULTI-AMP BIDDLE MEGGER

TM TM

Leakage Path Tightly bound bare wire

to ‘+’ve

terminal

to ‘G’

terminal



20G

10G

100M

500

10M

100k

600

400

300

200



100

Insulation

Range: 100 kΩ to 20 GΩ (also 0 Ω and ∞)

Test Voltages (d.c.): 500 V, 1000 V, 2500 V & 5000 V

Test Voltage Accuracy: ±5% of nominal test voltages on 20 MΩ load

Test Voltage Stability: <±1% (180 r.p.m. to 240 r.p.m. MJ15)

Insulation Accuracy see page 11

Short Circuit Current: 1,5 mA ± 0,5 mA

Maximum capacitance of load: 5 µF

Interference Rejection: 1 mA rms at 50 to 60 Hz

Discharge Resistor: <500 kΩ

Voltage

Range: 0 to 600 V a.c. indication of d.c.

Accuracy: see page 11

General

Overload rating: 720 V a.c. or d.c.

Scale Length: 72 mm (96˚)

Power Supply: BM15 8 x LR6 (AA alkaline or rechargeable) cells

MJ15 Low voltage brushless Generator or 8 x LR6 (AA alkaline) cell battery

Battery life: Typically 2000 ﬁve second tests at 5 kV on 100 MΩ load

Battery Indicator: Loaded battery test

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