Biddle BM11D_BM21 电路图.pdf

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1、5kV Digital Insulation Testers MEGGER BM11D MEGGER BM21 User Guide Guide de lutilisateur Gebrauchsanleitung Gua del usuario MEGGER RadioFans.CN 收音机爱 好者资料库 Note Users of this equipment and/or their employers are reminded that Health and Safety Legislation requires them to carry out valid risk assessm

2、ents 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 test leads constructed in accordance with the HSE guidance note GS38 Ele

3、ctrical Test Equipment for use by Electricians should be used. 1 RadioFans.CN 收音机爱 好者资料库 Safety Warnings3 General Description4 Features and Controls5 - 6 Operation Instrument Controls7 - 8 Features8 Testing Procedures9 Battery9 - 10 Guard Terminal10 -11 Condition and Warning Indicators11 -12 Applica

4、tion Notes Preventive Maintenance13 Insulation Testing Techniques14 Short Time or Spot Test15 Polarization Index (PI) Test15 Stress Conditions16 Specification17 -19 Accessories20 Repair and Warranty21 Guide Utilisateur22 - 37 Betriebsanleitung38 - 53 Gua del Usuario54 - 69 Contents Symbols used on t

5、he instrument are: Caution: Refer to accompanying notes. Risk of electric shock. Equipment protected throughout by Double Insulation (Class II). Equipment complies with EU Directives 2 RadioFans.CN 收音机爱 好者资料库 3 SAFETY WARNINGS #The circuit under test must be switched off, de-energised and isolated b

6、efore insulation test connections are made. #Circuit connections must not be touched during an insulation test. #After insulation tests, capacitive circuits must be discharged before disconnecting the test leads. #Turning the instrument off, and manually discharging of circuits on completion of test

7、s is recommended as standard procedure, before touching any connections. #In certain circumstances, break-down of the circuit under test may cause the instrument to terminate the test in an uncontrolled manner, possibly causing a loss of display while the circuit remains energised. In this event, it

8、 is even more important that the ON/OFF key is pressed, and the circuit manually discharged before touching any connections. #Test leads including crocodile clips must be in good order, clean and with no broken or cracked insulation. #Replacement fuses must be of the correct type and rating. #The in

9、strument should not be used if any part of it is damaged. #If water is present in the charger recess, the instrument must not be used. It is recommended that the instrument is not used in wet weather conditions. #See Battery Charging Power Cord on page 4. NOTE THE INSTRUMENT MUST ONLY BE USED BY SUI

10、TABLY TRAINED AND COMPETENT PERSONS. The BM11D and BM21 are compact, battery powered, high voltage d.c. insulation testers with resistance measurement capabilities to around 1 T. The BM11D has a digital full scale of 500 G whilst the BM21 can measure up to 5 T. The BM21 can be set to display leakage

11、 current instead of resistance and this mode of operation also allows higher resistances to be measured, possibly up to 500 T. The instruments are microprocessor controlled and feature a large, clear LCD combining digital and analogue readings of insulation resistance. Both instruments have test vol

12、tage positions of 500 V, 1000 V, 2500 V and 5000 V. The BM21 has an additional range with a variable output voltage of 25 V to 5000 V in 25 V steps. An integral timer is started automatically on commencement of the test, and displays elapsed minutes and seconds since the start of the test. The BM21

13、timer can be used to set the duration of test, and will automatically stop the output voltage when the time has expired. At the end of a test, capacitive loads are discharged automatically and the decaying voltage is displayed as the value returns to zero. The test leads should not be disconnected u

14、ntil the item has been discharged fully. Similarly, during a test the test leads should not be removed, and the item under test should not be touched. A flashing LED, and flashing high voltage symbols on the LCD remind the user that hazardous voltage is present. A battery symbol is displayed continu

15、ously showing the condition of the battery. Power is obtained from internal mains rechargeable batteries. To recharge the batteries requires an input voltage within the range 95-265 V a.c., 50-60 Hz. The power input and fuses are located in a splashproof recess on the front panel. Battery Charging P

16、ower cord: If the power cord plug is not suitable for your type of socket outlets (receptacles), do not use an adaptor. You should use a suitable alternative power cord, or if necessary change the plug by cutting the cord and fitting a suitable plug. The colour code of the cord is: Earth (Ground)Yel

17、low/Green NeutralBlue Phase (Line)Brown If using a fused plug, a 3 Amp fuse to BS 1362 should be fitted. Note: A plug severed from the power cord should be destroyed, as a plug with bare conductors is hazardous in a live socket outlet (receptacle). 4 General Description 5 Features and Controls BM11D

18、 Front Panel Layout IL M 1000V 00:30 1T 100G 10G 1G100M 10M 1M 0.1M 0 L M +G FS1FS2 100mA(T) 250V IEC127/1 95-265V a.c. 50-60Hz 24VA 400mA 100mA 250V IEC127/1 + 10-15 V d.c. G 12 V Charger Input Mains Socket Sliding Cover (open) Terminal Voltage Cursor Cursor TimerSelector Keys On / Off Button Fuse

19、FS2 Fuse FS1 Warnings Battery Symbol Test Button HV Warning LED 6 BM21 Front Panel Layout IL ML M I R 1000V 00:30 1T 100G 10G 1G100M 10M 1M 0.1M 0 L M G On / Off Button Sliding Cover (closed) Terminal Voltage Battery Symbol Cursor Range Keys Selector Keys Warnings Timer Test Button HV Warning LED IN

20、STRUMENT CONTROLS On/Off Button. Pressing the On/Off button starts the instrument and initiates a self check and calibration. All LCD segments appear for 5 seconds, then the word CAL appears for about 5 seconds. When the word CAL disappears, the instrument is ready for use, and is in standby mode. T

21、o switch the instrument off, press the on/off button once. (Auto switch off will occur after 10 minutes of non-use). Selector Keys The test voltage is selected by moving the cursor. When the test button is pressed the instrument will operate at the voltage indicated. BM21: In addition to the fixed t

22、est voltages the cursor can be used to select the variable voltage and test duration positions. Range Keys (BM21 only) The range keys have two purposes. The first purpose is to select the measuring range, whether insulation resistance, leakage current or burn mode. The second function is indicated b

23、y two arrows which appear above the keys when either the variable voltage or test duration positions are selected. Using the range keys in this mode will raise and lower the applicable parameter. The change in voltage is shown at the top of the display, and the change in test duration is indicated i

24、n the bottom left hand corner of the display. Test Button Pressing the large TEST button for more than one second will initiate a test at the selected voltage, simultaneously starting the timer. Pressing the button again will terminate the test and connect the internal discharge resistors across the

25、 output. If more than 50 V exists across the terminals, this will be indicated on the display. If the current flowing into the terminals exceeds 2 mA it will not be possible to start a test. A test may be terminated if; 1) The test time is exceeded. 2) The insulation under test suffers a complete br

26、eakdown. 3) The battery becomes exhausted. 4) Excessive electrical interference (2mA at 5 kV) (BM21 only). Battery Symbol When the battery is fully charged, all segments of the battery symbol will be indicated. As the battery is used the segments will recede. The symbol flashes when the battery capa

27、city is excessively low (See Battery). Cursor The cursors on either side of the display indicate the ranges selected. Condition and Warning Indication Factors which may affect or inhibit a test are indicated by a large flashing cursor next to the appropriate warning label. (See Condition and Warning

28、 Indicators). FS1: Mains input fuse. FS2: Guard fuse. 12 V Charger input The rechargeable batteries within the instrument can be charged from a 12 V supply. Connection is made through this socket. + Mains socket To recharge the internal batteries a mains input of 95-265 V a.c. (50/60Hz) is required.

29、 The socket accepts a “Euro” plug. 7 Operation Sliding cover The sliding cover ensures that the input and the output terminals cannot be accessed simultaneously. Terminals The terminals marked +, and G lock the test leads into the case to prevent accidental disconnection. Terminal Voltage At the end

30、 of a test, any voltage remaining on the terminals will be indicated until it has decayed to less than 50 V. BM21:Output terminal voltage is indicated during a test. Timer BM11D:The timer automatically starts when the test button is pressed. It indicates the time elapsed. Maximum test duration is 60

31、 minutes, when the test will be stopped automatically. BM21: The test time can be set by the user. Selecting using the selector keys, and using the range keys to ramp the time up or down will set the duration of test. (Maximum 90 minutes). The timer will automatically start when the test button is p

32、ressed, and will stop when the test duration has elapsed (unless stopped in one of the other ways). Setting the timer to zero minutes effectively disables the instrument. A test time of 10 minutes is useful for Polarisation Index (PI) testing. For more information on PI testing, see Application of T

33、est techniques. FEATURES Automatic Discharge Internal discharge resistors will be selected automatically 1)At the end of a test 2)If the instrument is switched off 3)If an internal error is detected Variable Voltage (BM21 only) The variable voltage position provides the user with the option to selec

34、t a non-standard voltage between 25 and 5000 V d.c.,or to continuously vary the voltage selected (in 25 V steps) during a test. When operating on this range, the measurement range (either R, I or BURN) cannot be changed. The measurement range must therefore be selected before the variable voltage po

35、sition is chosen. To select the test voltage required, move the cursor to the position and adjust the output terminal voltage using the Range keys. The terminal voltage is shown at the top of the display. BURN Mode (BM21 only) Selecting BURN mode will enable testing to continue after a breakdown, fo

36、r fault location. Under some conditions, the breakdown will cause erratic display operation.The burn mode can only be selected before a test is started. The detachable lid Specially designed lid hinges enable the lid to be removed and replaced as required, and will protect the lid from strain or dam

37、age by unclipping itself if unintentionally opened past its full extent. To replace the lid, hold it vertically and push the hinges back into their clips again while restraining the instrument. Then fold the lid shut. 8 TESTING PROCEDURES When not testing, i.e. when in standby mode, the instrument a

38、cts as a voltmeter. 1.Select the required test voltage with the selector keys. 2.To start a test, press the red test button for more than one second. The HV warning LED on the front of the instrument flashes, together with the display HV warning symbols. When testing resistive or moderately capaciti

39、ve loads (up to about 1 F) the test voltage will appear within a few seconds. On large capacitive items the voltage rise will be noticeably slower and on low resistance (less than 10 M) the voltage may never rise to its nominal value. Insulation resistance readings are updated once every second for

40、readings up to about 100 M. For readings between 1 G and infinity the sample rate will slow down to once every 20 seconds. Changing the voltage during a test will upset the reading temporarily. The correct reading will appear when the new voltage has been stable over a full sample period. 3.When the

41、 test is terminated the item under test will be automatically discharged. The test can be stopped manually by pressing the red test button. The test will be stopped automatically if the test duration is reached, the instrument is turned off, an internal error occurs, a fuse blows or if excessive noi

42、se is detected (except in Burn mode on the BM21). When the test has stopped the final reading will be held on the digital display. 4.(BM21 only) Pressing either of the selector keys will change the display to show the capacitance of the item under test. N.B. The capacitance reading is only available

43、 if the test has run for more than one minute, and provided the reading was not over-range. Reading Limitations The BM11/D can measure currents down to 10 nA. The highest digital readings obtainable are therefore 50 G at 500 V but rising to 500 G at 5000 V. The analogue display works at all voltages

44、 up to 1 T. The BM21 is considerably better at the high end of the scale. The highest digital readings obtainable are 500 G at 500 V and 5 T at 5000 V. It is possible to read even higher resistances by switching from R to I mode (using the right Range keys). The digital display then shows leakage cu

45、rrent, resolving to 0.01 nA. Using this method it is theoretically possible to measure resistance up to 500 T at 5000 V but it will be necessary to perform an open circuit calibration test to establish measurement circuit offset current and test lead leakage. (This is 0,2 nA at normal temperatures w

46、ith new, clean test leads). Note that if the variable voltage has been selected, the decision to read R or I must be made before the test is started. BATTERY The instrument is powered by two rechargeable, sealed, lead- acid batteries. The state of charge is indicated by the battery symbol on the dis

47、play. It is not possible to over charge or over discharge the batteries. When the last battery segment flashes there is very little energy left, probably less than 1 hour of testing. Turning the instrument off completely between tests will conserve the remaining battery energy. When batteries are co

48、mpletely exhausted the battery symbol will flash and the instrument will switch off. For maximum reliability, try to keep the batteries in a fully charged state and do not charge at extreme ambient temperatures. The batteries normally last 9 Operation about 5 years; less if subjected to high tempera

49、tures for much of the working day. To reduce the chances of sudden failure, two batteries are used, operating in parallel. If either battery fails, the instrument will continue to operate on the good battery but the FS2 indication will flash constantly. (See Condition and Warning Indicators). Charging the batteries should be done in a dry environment (the instrument is not waterproof with the charging cover open). Unplug the test leads and slide the charging cover open. (This operation renders the test lead sockets inaccessible and therefore prevents any dang