Megger MIT1025 User Manual Download Page 1

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MIT 515, MIT525, MIT1025, MIT1525
5 kV, 10 kV & 15 kV Insulation
Resistance Testers

USER MANUAL

Summary of Contents for MIT1025

Page 1: ...MIT 515 MIT525 MIT1025 MIT1525 5 kV 10 kV 15 kV Insulation Resistance Testers USER MANUAL M...

Page 2: ...nsulation testing in wet conditions might be hazardous It is recommended that this instrument is not used in these circumstances If this is unavoidable the user must take all necessary precautions Thi...

Page 3: ...irective The crossed out wheeled bin symbol on the instrument and on the batteries is a reminder not to dispose of them with general waste at the end of their life Megger is registered in the UK as a...

Page 4: ...lication 15 Battery indicator 15 On screen error reporting 16 Measurement Modes 17 Spot IR test 17 Timed IR test 17 DAR and PI Insulation Tests 17 Dielectric Discharge test 18 Step Voltage Test 19 Ram...

Page 5: ...and over voltage tests PI DAR DD SV and ramp test Operate and charge on line power mains except during actual test Light weight Li ion battery CATIV 600 V safety rating MIT515 MIT525 MIT1025 CATIV 100...

Page 6: ...g lamp 7 Backlight button 8 Central rotary switch 9 Save button MIT525 MIT1025 MIT1525 10 Test mode rotary switch 11 LED indicating line power mains 12 Display 13 Power socket 14 Functional earth term...

Page 7: ...optimum battery life charge the battery after each use Full charge duration is up to 2 hours but a first charge time of 3 hours is advised The battery must be charged between 0 C and 40 C ambient tem...

Page 8: ...dels have a backlight button A second rotary switch controls the insulation test mode providing for the following tests All models have basic insulation resistance IR timed insulation resistance IR t...

Page 9: ...measured and displayed for AC voltages Voltmeter mode is activated by switching to V mode as illustrated Positive and negative terminals are used for the voltmeter function do not connect the GUARD t...

Page 10: ...it is saved by pressing the OK button The setting does not change even if the instrument is switched off Alarm setting A low resistance alarm sounds when the resistance level of an insulator reaches...

Page 11: ...ly noisy environments Should electrical noise be present it will cause a current to flow through the instrument s internal discharge resistors If this becomes excessive and exceeds instrument rating d...

Page 12: ...period if not deactivated manually Memory functions and downloading Models MIT525 MIT1025 and MIT1525 have advanced storage recall and download functions to facilitate documentation of insulation test...

Page 13: ...1 Hz from the IRT and displayed in real time on a graph e g a plot of current A versus voltage kV for the ramp test Before running a test where a real time output is required attach a PC running Power...

Page 14: ...vided and enable the driver for the S1 MIT to be found via the internet or alternatively load the version supplied on the product CD if the PC being used has no access to the internet The instrument d...

Page 15: ...on of the test Other functions include Save Selected To Form this soft key saves a selected test result in top right hand menu to the current form in PowerDB Lite Typically three tables are available...

Page 16: ...hat the battery has failed On screen error reporting Should an error be detected during the operation of the MIT515 MIT525 MIT1025 or MIT1525 an error code is reported preceded by Err with the read ha...

Page 17: ...sociated with it is calculated and displayed Time Constant TC Rinsulation x Cinsulation Timed IR test A timed test IR t will automatically terminate an insulation test after a preset time Default time...

Page 18: ...test operates during the discharge of the dielectric under test Originally developed by EDF France s power utility company it is a diagnostic insulation test that allows ageing deterioration and void...

Page 19: ...4 7 Questionable 2 4 Good 2 Homogenous 0 Step Voltage Test The SV test is a controlled overvoltage test that can be applied to stator and rotor windings on synchronous and asynchronous AC motors and...

Page 20: ...ge ramp dV dt is 1 kV min which is the default for MIT525 MIT1025 and MIT1525 This value is user adjustable from the settings function with the mode rotary switch set to ramp Up and down buttons are u...

Page 21: ...otal current flowing in an insulator The total current has four components capacitive current absorption current conductance current and leakage current In the case of dry insulation conductance curre...

Page 22: ...tive terminal is at the same voltage as the guard terminal the leakage into the negative terminal will be considerably reduced This will improve accuracy because the current flowing into the negative...

Page 23: ...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 t...

Page 24: ...ntains Lithium ion cells and should be replaced when it no longer holds a charge A new battery is available as a spare part from Megger Genuine Megger battery packs must be used Failure to use genuine...

Page 25: ...1525 battery packs x 2 replacement instructions 1 Switch the instrument OFF and disconnect the AC supply measurement leads and all other equipment before opening the case to change the battery 2 Alway...

Page 26: ...n 25 V steps MIT1525 5 kV to 15 kV in 25 V steps Accuracy 23 C from 1 M to MIT515 MIT525 5 to 1 T 20 to 10 T MIT1025 5 to 2 T 20 to 20 T MIT1525 5 to 3 T 20 to 30 T Guard positioned centrally on insul...

Page 27: ...r 600 V to a maximum of 3 mA MIT1525 1 mA per 350 V to a maximum of 6 mA Voltmeter range 30 V to 660 V ac or dc 50 60 Hz Voltmeter accuracy 3 3 V Timer range Up to 99 minutes 15 second minimum setting...

Page 28: ...condensing at 40 C Ingress protection IP65 lid closed IP40 lid open GENERAL SPECIFICATION Safety MIT515 MIT525 MIT1025 Meets the requirements of IEC 61010 1 CATIV 600 V to 3000 m Instrument must be o...

Page 29: ...strument continues to provide the high standard of performance and workmanship you expect These facilities are complemented by a worldwide network of approved repair and calibration companies to offer...

Page 30: ...30 Approved Service Centres A list of Approved Service Centres may be obtained from the UK address above or from Megger s website at www megger com...

Page 31: ...ptional Accessories HV test lead sets 3 m leadset x 3 medium insulated clips 1002 531 3 m leadset x 3 large insulated clips 1002 534 3 m leadset x 3 bare clips 8101 181 8 m leadset x 3 bare clips 8101...

Page 32: ...M This instrument is manufactured in the United Kingdom The company reserves the right to change the specification or design without prior notice Megger is a registered trademark Part No www megger c...

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