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Summary of Contents for MEGABRAS MD 5060x
- Page 1 5 kV digital insulation tester • User guide • Technical specifications GU-1329 EXP100240...
- Page 2 MD-5060x 5 kV digital insulation tester User guide GU-1329 © 2009 MEGABRAS. All rights reserved. Printed in Brazil.
- Page 3 Safety warnings Before to use this instrument the User guide and Safety warnings must be read • and understood. • Safety procedures and rules for working near high voltage energized systems must be observed during the use of this equipment. The generated voltages may be dangerous.
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Page 4: Table Of Contents
Index 1. Description ......................6 2. Control panel functions ..................7 2.1. Connections and panel items ................ 7 2.2. Keyboard ....................... 8 2.3. Indicators ..................... 10 2.3.1. Display ....................10 2.3.2. Built-in chronometer ................10 2.3.3. Real time clock ..................10 2.3.4. -
Page 5: Description
1. Description The Megabras MD-5060x is a smart, microprocessor-controlled, 5 kV insulation tester and analyzer. Besides the conventional measurement of insulation resistances up to 5 TΩ, its advanced features allow to automatically measure both the Polarization Index and Dielectric Absorption Index, thus significantly simplifying testing of transformers. -
Page 6: Control Panel Functions
2. Control panel functions 2.1. Connections and panel items Voltage output terminal (-V) Zero reference terminal (+R) Guard terminal (G) Display Keyboard USB communication port Power supply input Paper feed control... -
Page 7: Keyboard
2.2. Keyboard Button Function On/Off switch. It activates the filter that minimizes external Indicates filter function noise interference. is on. Indicates that the It shows the battery charge status on the battery charger is in display. operation. When activated, it allows to program test 500 V steps test voltage in steps of 500 V. - Page 8 When activated, it allows to program the Indicates Operation Operation Mode (Normal, SVT or TIMER). Mode is enabled. When activated, it allows to program the limit of Indicates LIM function the “Pass-Fail test”. is on. Turns On/Off the printing of the measured The printer is on.
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Page 9: Indicators
2.3. Indicators 2.3.1. Display Alphanumeric LCD where the measurement result, the corresponding measuring unit, the elapsed time since the measurement started, the analogue indication by means of a bargraph and messages to the operator are displayed (in English). messages to the operator test number measurement results measuring unit... -
Page 10: High Voltage Indicator
2.3.6. High voltage indicator A light indicator warns the occurrence of high voltage on the output terminal during the measurement and keeps lit until the discharging process has been completed. 3. Power supply This equipment is powered by an internal rechargeable battery (12 V - 2.3 Ah). -
Page 11: Battery Charger
3.2. Battery charger This equipment has an intelligent built-in circuit that controls the battery charge and doesn’t allow the equipment to operate during the charging process. In order to charge the battery, follow this procedure: Verify that the On/Off switch is switched off. •... -
Page 12: Connecting The Equipment
4. Connecting the equipment ATTENTION: For a safety operation the procedures detailed below should be carried out with the device Powered-Off. Check if there is no differences of potential voltage between the points where the equipment shall will be connected to, nor between them and the ground. -
Page 13: Using The Guard Terminal
GUARD or R terminals must be grounded, but not both of them simultaneously. MEGABRAS Application Note 32 explains the usage of Guard terminal for minimizing the parasite resistance effect, whose influence one intends to minimize. -
Page 14: Test Voltage Definition
5.1. Test voltage definition In order to define the test voltage value, first it is necessary to select one of voltage adjustment keys: . These keys enable both the pre- programmed voltage selection ( ) and the keys which increase or decrease the value of the step voltage test for 100 V or 500 V, depending on the selected voltage adjustment key. -
Page 15: Selection Of The Operation Mode
5.2. Selection of the operation mode The MD-5060x insulation tester has four operation modes: Normal, with “TIMER”, SVT and “Pass / Fail test”. The first three modes are selected using the key; the “Pass/ Fail test” mode is activated pressing key. -
Page 16: Svt Mode (Step Voltage Tests)
5.2.2. SVT Mode (step voltage tests) The use of key allows the MD-5060x setting for the performance of a step voltage test; when this mode is selected, the display shows the SVT abbreviation. Under this operation mode, the user does not define a specific voltage test, but a maximum voltage value. -
Page 17: Pass / Fail" Test Mode
The test result is calculated according to the following formula: V MAX After test ending, the value may be recovered by pressing key. 5.2.3. “Pass / Fail” Test mode Press key in order to determine the lower insulation limit for type “Pass / Fail test”. -
Page 18: Normal Mode
5.2.4. Normal mode The normal mode is used in the resistance measurement with unique voltage, without time limit. When selected, there are no special indications in the display. To return to normal mode, press the key and use the to select the “- - -” option. 6. -
Page 19: Polarization Index (Pi)
If the measured value is within the device range, the display will show the resistance value indication and its corresponding unit, and it will start the analogue bargraph indication. If the measured value exceeds 5 TΩ @ 5 kV, the following message will be read: Note: If, during the test, it is necessary to change the test voltage, item 5.1 sequence shall be repeated... -
Page 20: Dielectric Absorption Index (Dai)
The polarization index is the ratio between the insulation resistance value measured after 10 min and the value measured after 1 min. This index is useful to determine whether it is necessary to perform preventive and predictive Maintenance in order to detect any insulation resistance wear and tear due to the excess of dust, dirt, grease, or else the action of chemical or physical agents, etc. -
Page 21: Other Functions
7. Other functions 7.1. Filter When insulation measures are carried out in transformers or in large dimension machines, in presence of strong electromagnetic fields, it is possible that the equipment reading is unstable, especially for resistance values higher than 100 MΩ. In these cases it is convenient to press the key before starting the measurement. -
Page 22: Internal Memory
7.4. Internal memory This equipment has an internal memory for up to 4000 measured values. This memory is administrated by the instrument and works in a cyclic way, this means, when the memory is full, the oldest values in the memory will be replaced by the newest ones. -
Page 23: Software
8. Software 8.1. USB Drivers To install the USB drivers required for the communication between PC and equipment follow the instructions: 1. Insert the CD-ROM, supplied with the equipment, in the PC. 2. Connect the equipment in the PC using the USB cable. ®... - Page 24 5. Choose “Install the software automatically” and click in Next. 6. In the window “Hardware installation” click in Continue Anyway.
- Page 25 7. Installation continues and finishes quickly. 8. Click in Finish.
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Page 26: Megalogg2 Software
After the installation, will be necessary to repeat the procedure again to install the “USB Serial Port”. 8.2. MegaLogg2 Software This software makes communication between the equipment and a computer with Windows operative system easier. It makes it possible to synchronize the date and time of the equipment internal clock with the computer date and clock, to transfer the stored date, to clear the memory, to generate tests graphics and protocols, etc. -
Page 27: Hyperterminal ® - Real Time Data Transfer
® 8.3. HyperTerminal - Real time data transfer To download the equipment’s internal memory to a computer, you should use the MegaLogg2 software. ® To transfer data in real time, using the HyperTerminal software, from the MD-5060x to a PC-type computer, use the cable provided with the accessories. - Page 28 2. Click in System. 3. Click in Hardware / Device manager.
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Page 29: Hyperterminal
4. Check in the window “Device manager” the COM number of MEGABRAS equipment. 8.3.2. HyperTerminal 1. Open Windows: Start / Programs / Accessories / Communication / HyperTerminal 2. To set up a new connection, enter a name and then select an icon. - Page 30 3. Select the COM defined to MEGABRAS equipment. 4. In the next window to fill out the relevant data: 4800, 8, none, 1, none.
- Page 31 5. Now the PC is ready to collect the information obtained from measurements. If is pressed, the MD-5060x will start sending data to the computer. A typical line can feature the following format:...
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Page 32: Printer
9. Printer In order to enable the printing function press key. Measured values will be printed each 15 seconds, and the Dielectric Absorption Index and Polarization Index will be printed after 1 minute and 10 minutes respectively. Printing may be started or stopped at any time during the test. -
Page 33: Technical Specifications
10. Technical specifications Test voltages : 500, 1000, 2500, 5000 V with fast selection. 500 V to 5 kV in 100 V or 500 V steps. DC, negative in relation to grounding. Maximum resistance reading : 5 TΩ @ 5 kV. Short circuit current : 1.5 ±... - Page 34 Power supply : Internal rechargeable battery (12 V - 2.3 Ah). Battery charger : 100 - 240 V~ mains supply. Operating temperature range : -5°C to +50°C. Storage temperature range : -25°C to +65°C. Humidity range : 95% RH (non condensing). Dimensions : 274 x 250 x 124 mm Equipment weight...
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Page 35: Application Note 32
11. Application note 32 Use of “Guard” terminal in insulation testers When insulation resistance measurements are performed with insulation testers, especially with high sensitivity instruments measuring high resistance values, the use of the GUARD terminal avoids the harmful influence of stray resistances. In order to better explain the function of this terminal, let us start reviewing the insulation tester basic circuit diagram of fig. - Page 36 A typical example of this situation is when the insulation resistance between primary and secondary windings of a transformer mounted inside a metal housing is to be measured. Rx: Insulation resistance between primary and secondary winding. R1: Insulation resistance between primary winding and housing. R2: Insulation resistance between secondary winding and housing.
- Page 37 In the circuit of Fig. 3 it may be noted that R1 is in parallel with a low- value resistance (the one from the micro-ammeter) therefore its influence is reduced during reading. Through resistance R2 circulates a current which is not passing through the meter and consequently does not affect the reading.
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Page 38: Warranty
To obtain warranty service, send the equipment, with a description of the difficult, shipping and insurance prepaid, to MEGABRAS. The manufacturer assumes no risk for damage in transit. MEGABRAS will, at its option, repair or replace the defective equipment free of charge or refund your purchase price. However, if... - Page 39 Notes...
- Page 40 Notes...
- Page 41 Notes...
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