81331 Rev 01 Nov 2010 Instruction Manual DELTA4000 12-kV Insulation Diagnostic System HIGH VOLTAGE EQUIPMENT Read this entire manual before operating. M Valley Forge Corporate Center 2621 Van Buren Avenue Norristown, PA 19403-2329 U.S.A. 610-676-8500 www.megger.
DELTA4000 12-kV Insulation Diagnostic System
Copyright© 2010 by Megger. All rights reserved. The information presented in this manual is believed to be adequate for the intended use of the product. If the product or its individual instruments are used for purposes other than those specified herein, confirmation of their validity and suitability must be obtained from Megger. Refer to the warranty information below. Specifications are subject to change without notice.
Table of Contents 1 Introduction ..........................................................................................................................................................1 Receiving Instructions .....................................................................................................................................1 General Information........................................................................................................................................
Auto tip-up Test ........................................................................................................................................36 Results .........................................................................................................................................................36 Frequency Sweep.......................................................................................................................................36 Manual ................................
Diagnostic Tests ....................................................................................................................................... 66 92530- Vacuum Circuit Breaker ................................................................................................................. 67 Basic Form Information .............................................................................................................................. 67 Description of Tests ...................................
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1 Introduction Receiving Instructions Check the equipment received against the packing list to ensure that all materials are present. Notify Megger of any shortage. Examine the instrument for damage received in transit. If damage is discovered, file a claim with the carrier at once and notify Megger, giving a detailed description of the damage. This instrument has been thoroughly tested and inspected to meet rigid specifications before being shipped.
M Two-piece design for easy transportation Rugged and robust and only 14+22 kg (31+48 lb) Performs all standard UST and GST tests Handling up to 15 mA interference current into any lead of the instrument or a signal to noise ratio of 1:20, secures stable readings and correct data even in the highest interference switchyards.
2 Safety Precautions The test set and the specimen to which it is connected are a possible source of high-voltage electrical energy and all persons making or assisting in tests must use all practical safety precautions to prevent contact with energized parts of the test equipment and related circuits. Also follow all local and company safety requirements.
M It is not possible to eliminate all potential hazards from, and in using, electrical test equipment. For this reason, every effort has been made to point out in this instruction manual the proper procedures and precautions to be followed by the user in operating this equipment and to mark the equipment itself with precautionary warnings where appropriate. It is not possible to foresee every hazard which may occur in the various applications of this equipment.
Safety Warning and Caution Notices Warning and caution notices are used throughout this manual where applicable and should be strictly observed. These notices appear in the format shown below and are defined as follows: F G WARNING Warning, as used in this manual, is defined as a condition or practice which could result in personal injury or loss of life.
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3 Specifications Technical Specifications Input Power: 100-240 V ± 10 %, 50/60 Hz, 16 A max Output voltage: 0 to 12 kV, continuously adjustable Test frequency range: 45-70 Hz (12 kV) 15-405 Hz (4 kV) 1-505 Hz (250 V) Output power: 3.
M Power Factor: 0 to 100%, 0.001% maximum resolution Dissipation Factor: 0 to 100, 0.001% maximum resolution Watt Loss: 0 to 2 kW, actual power, 0 to 100 kW when corrected to 10 kV equivalent. 0.1mW maximum resolution. The measurement can be corrected to either 2.5 kV or 10 kV equivalents.
Specifications Computer Interfaces: Printer: USB Communication: Ethernet and USB User Interface (Delta4310 on-board computer model): 8.4 in.
M Weight: Delta4100 Control Unit (to be used with external computer): 14kg (33lbs) Delta4300 Control Unit (with on-board computer): 15kg (31lbs) Delta4110 HV Unit: 22 kg (48lbs) Standard cables: 15 kg (33lbs) Test Modes Delta4000 supports the following test modes: UST: Ungrounded Specimen Testing Test mode Measure Ground Guard UST-R Red Blue --- UST-B Blue Red --- UST-RB Red and Blue --- --- GST: Grounded Specimen Testing Test mode Measure Ground Guard GST-GND Ground Red and Bl
Specifications Maximum Specimen Capacitance Table 1 shows the maximum measurable specimen capacitance at various voltages and loading time. This can be increased up to 1.2 F at 10 kV (50 Hz) test voltage using the optional Resonating Inductor. Table 1: Maximum Measureable Specimen Capacitance at 50/60Hz Test Volts (kV) Maximum Capacitance (µF) (100 mA continuos service) Maximum Capacitance (µF) (300 mA for 4 minutes) 60 Hz 50 Hz 60 Hz 50 Hz 0.025 11 13 32 38 0.05 5.3 6.3 16 19 0.1 2.
M Safety Features Safety features include; External hand or foot (optional) interlock switches must be closed to energize high-voltage circuit. Dual ground required to energize high-voltage circuit. Circuit breaker for short-circuit protection. All controls at ground potential. Over-voltage protective devices prevent damage to test set in the event of specimen breakdown. Low-voltage inputs are grounded when the test set is turned off or between measurements.
Specifications Accessories Included Accessories High voltage lead: 21 m (70 ft), double shielded 30012-11 Measurement lead, color-coded red 5572-1 Measurement lead, color-coded blue 5572-2 Ground lead: 9 m (30 ft) 002-131 Mains cable 16A EU 7032-19 Mains cable 16A US 7032-20 Mains cable 16A UK 7032-21 Mains cable 16A no plug 7032-22 Safety hand switch, Interlock #1: 18 m (60 ft) 1001-850 Safety hand switch, Interlock #2: 2.
M Transport case, 2-piece design Case for control unit and accessories [1] 2001-746 Case for HV unit and accessories [1] 2001-746 Transport case, 3-piece design Case for control unit [1] 2001-791 Case for HV unit [1] 2001-791 Case for accessories [1] 2001-792 Transport cart / trolley 1001-530 Calibration box set for CAL4000 2002-137 Calibration standard 670500-1 Transit cases for calibration standard 670635 HV TTR capacitor, single phase (10 nF, 10 kV) 36610 HV reference capacitor (100 p
4 Controls, Indicators, and Connectors Control Unit Side Panel Figure 1: Side Panel – Control Unit 81331 Rev 01 Nov 2010 15
M HV ON Warning signal indicating that the HV unit is active OPEN GROUND When lit, this yellow lamp indicates an open in double ground system or defective grounding of test set. SAFETY Two plug receptacles for connecting external INTERLOCK interlock switches.
Controls, Indicators, and Connectors STROBE Receptacle for connecting the warning strobe light TEMP and %RH Receptacle for connecting the temp and humidity sensor (optional accessory) INDUCTOR Receptacle for connecting the test set to an optional Resonating Inductor (Cat. No. 670600) for extended capacitance range. HV CONTROL Receptacle for the control cable between the control and HV units MAINS Receptacle for connecting the test set to an AC power source as marked on panel.
M High Voltage Unit Connector Panel Figure 2: Connector panel – HV Unit HV CONTROL Receptacle for the control cable between the control and HV units HV POWER Receptacle for the power cable between the control and HV units GROUND This wing nut is for connecting an additional safety ground between the control and HV units HV Output Receptacle for the high voltage cable (located on the side exterior of the equipment box) NOTE: The HV cable is connected on the other side of the unit.
5 Setup and Operation Safety Precautions F Warning The output of this test set can be lethal. As with any high-voltage equipment, caution must be used at all times and all safety procedures followed. Read and understand Section 2, Safety, before proceeding. Be sure that the test specimen is de-energized and grounded before making connections.
M When making transformer excitation current measurements conduct all tests on high-voltage windings only. This reduces the required charging current. In load tap changers, set to fully raised or fully lowered position for routine tests. WARNING F There is always the possibility of voltages being induced at the terminals of a test specimen because of proximity to energized high-voltage lines or equipment. A residual static voltage charge may also be present at these terminals.
Setup and Operation DELTA4000 CONTROL UNIT DELTA4000 HIGH VOLTAGE UNIT Figure 7: Typical Test Setup for Transformer Excitation Current Measurements 1. Locate the test set at least 6 ft (1.8 m) from the specimen to be tested. 2. Connect the test ground to a low impedance earth ground on the specimen (if possible). This should always be the first cable connected and last removed 3. Connect the control and power cables between the control and HV units.
M 6. Connect the high-voltage cable to the high-voltage terminal of the highvoltage unit (be sure that the connector locks in place). 7. With the main breaker OFF, plug the input power cord into the test set power receptacle and into a three-wire grounded power receptacle having the appropriate voltage and current ratings. 8. When using a generator as a power source, note that the generator itself should be grounded to a suitable earth ground.
Setup and Operation Pending what model of Delta4000 you are using and if testing is performed automatically with PowerDB or manual with Delta Control SW, the actual testing procedure will vary. The following sections describe how to use Delta4000 with external or internal computer using Delta Control and PowerDB SW.
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6 Delta Control User Interface Introduction The Delta Control software is an intuitive manual user interface where every feature is easy to identify. The buttons look like regular buttons on a mechanical front panel making the user feel as if he is using the instrument in a manual mode. The software can be operated using a touch screen or mouse control simply by clicking on the buttons. You may also “tab” between buttons using the keyboard.
M Operation Test Mode Delta 4000 offers a quick setting for available test modes. The top line (UST-R in this case) defines and describes the selected test mode. The second and third lines explain how the instrument is configured for the measurement. They have a different designation depending on if UST (Ungrounded Specimen Test) or GST (Grounded Specimen Test) measurements are conducted. UST mode Ground and Guard are internally connected.
Delta Control User Interface Test Mode Examples Two winding transformer test When UST-R is used for the CHL test, the HV output terminal is to be connected to the primary winding and the red terminal to the secondary winding. The blue terminal does not have to be connected in this case.
M Three winding transformer test When UST-R is selected for a CHL test, the HV output terminal is to be connected to the primary winding, the red terminal to the secondary winding and the blue terminal to the tertiary winding. The blue terminal is in this case grounded/guarded. For CHT measurement UST-B should be selected. The blue terminal is now measured and the red is grounded. The time saving benefit is that the transformer can be tested without the need for reconnections.
Delta Control User Interface Frequency and Temperature This is where you specify at which test frequency you want to perform the test. This is in most cases the same as the network frequency (but if you would like to test at e.g. 55 Hz you simply enter 55). Note that “Line Frequency” in the setting tab must be set to actual line frequency, 50Hz or 60 Hz. Insulation properties are temperature dependent and the test object temperature is a very important parameter.
M Auto Tip-up Test Tip-up testing is used for testing power components with voltage dependent dissipation factor (e.g. generators) or in case a voltage dependence is suspected and indicated by high VDF in Delta4000. The highest voltage level used is set on main page and the voltage per step is set on the settings page Voltage steps can be set on the settings page Frequency Sweep Frequency Sweep allows the user to perform a series of tests over a frequency range.
Delta Control User Interface Voltage Control The voltage control has three sections. The top section is the voltmeter that shows the voltage in real time. Under the voltmeter is a display showing the set voltage (target voltage). You can click on this display to enter the target voltage or increase or decrease it using the buttons in the centre control. Below the display area is a round control where you can manually adjust voltage up or down.
M Start and Stop When you are ready to start measuring, press the Start button. In all modes except the Manual type, the measurement sequence is automatic and the result presented when finished. If you need to stop an ongoing measurement press the Stop button. Note: the Stop button stops the measurement smoothly, if stop by emergency reason, simply release the interlock in the interlock handle. Note that the green light on the start button will not illuminate until both interlock switches are closed.
Delta Control User Interface Results In the results panel you can see the result of the latest measurement. Indicators The indicators show if there are anything that prevents a measurement from starting. If the Interlock Open led is on, you have to close both switches before you can start a test. If the open ground led is on, you have to ensure that the ground potential of the test object and the instrument is the same. The measurement cannot start if any of these led's are turned on.
M Menu In the menu you can access various extra functions. Settings Access the default settings used in the program. Graph Shows graph of performed measurements. Log Show a log of measured values. Help Shows a help file. Status Accessing information about internal %RH, temperatures , serial numbers and SW/Firmware version.
Delta Control User Interface Settings The Test Settings dialog allows for user preference and test sequence settings. The user can also reset the software to factory default settings by pressing the Factory Settings button in the lower right corner. General Under the general section you can change the default line frequency. Specify if you want to display the values as power factor or tan-delta. You can also change the integration time between 3 and 200 seconds or set it to automatic.
M Excitation Current Here you can select either frequency variation or line sync reversal (default) for noise suppression Auto tip-up Test Set the kV/step for the auto tipup test. The software will automatically increase the voltage by the increment set in this box until the entered test voltage selected in the main screen is reached.
Delta Control User Interface Graph The graph dialog shows graphs of the measured values. Log The log shows all measured values from the performed tests. The clear log button clears all measured values.
M The Export CSV button makes is possible to export the log as a comma separated file for processing in other software or store for future reference. When exporting to CSV you can choose if you want to have a header or not and what type of decimal separator you want to use. You may also mark suitable part of the log-fields and simply use cut (ctrl+c) and paste it into e.g. excel (ctrl+v).
7 PowerDB User Interface Introduction PowerDB Lite is a free, but limited capability, version of the PowerDB software tool that is designed specifically to control and/or extract data from Megger instruments. The primary difference between PowerDB Lite and PowerDB is that PowerDB is designed to work with other manufacturers’ equipment and has field and office synchronization capabilities. PowerDB Lite will present your test data into a professional looking data form that can be sent to a printer or .
M Software Installation To install PowerDB Lite, load the PowerDB Lite CD into your CD-ROM drive and follow the on-screen instructions. 1. Accept the terms of the License agreement. 2. Choose the destination location for the PowerDB Lite files.
Delta 4310 User Interface 3. Select Default Settings. 4. InstallShield Wizard will complete the installation of PowerDB Lite. Click Finish to close the installation program. NOTE: Tto run the Delta4000 with PowerDB you must also install the Delta Control SW. To install Delta Control, load the SW CD into your CD-ROM drive and follow the on-screen instructions.
M Using Delta4000 with PowerDB 1. Start the program and select Delta4000 in the Instrument Setup screen. If you already have tested this object at an earlier occasion, open up this file instead using “Open Existing Results File”. PowerDB is designed to save data from several tests on one object in same file. Please note that Delta Control SW must also be installed to be able to run Delta4000 and perform measurements.
Delta 4310 User Interface 3. Enter nameplate/test object/test conditions data into the form. 4. When testing is ready to be performed, the test can be started by; Right-click the desired blue highlighted test number or press F2 when the actual test row is activated (highlighted in yellow) or for Delta4310 press the “Test” button when the actual test row is activated A pop-up screen will appear with selected test parameters.
M 5. To change the settings of the Delta4000, use the “Settings” button or place the mouse on the test form background, right-click and then select “Power Factor Settings”. 6. Saving the data a. Before the first test is performed, PowerDB will ask where to save your form with the measured data b. The Save As screen will allow you to specify a location and file name for your PowerDB Lite XML file.
Delta 4310 User Interface 7. Open a previously performed test by opening the file in your selected folder. A pop-up screen will appear, listing all measurements for this object, and you can open the individual measurement in PowerDB or perform a new test. 8. Setting the Logos on the PowerDB form a. Select the Tools>Options menu item. b. The Logos section specifies paths to the left and right logos files to use. c. To change the left logo press the “…” button by the left logo path. d.
M 9. Change language and units a. Select the Tools>Options menu item. b. Select the appropriate language in the dropdown menu.
8 PowerDB Test Forms General Input fields There are a number of input fields in the various forms. Some are text e.g. site information, others are drop down lists where only the selected values are valid. To move between input fields you can use “Tab”, “Enter” and/or arrow buttons or use a mouse/pointer. If you have a computer with touch screen you may just point at the field. Use keyboard for input values. Transformer Configuration Selecting Tests Most forms have a variable complexity.
M Frequency Sweep Delta4000 can also measure multiple frequencies in a “frequency sweep”. Individual frequencies are defined in a list in PDB settings. The maximum frequency range is pending the test voltage as described in the following table. Note: Test Voltage Maximum frequency range 12 kV 45-70 Hz 4 kV 15-405 Hz 2 kV 8-505 Hz 1 kV 4-505 Hz 500 V 2-505 Hz 250 V 1-505 Hz Do not select the power frequency or any multiple of power frequency in a frequency sweep, e.g.
Delta 4310 User Interface Intelligent Temperature Correction, ITC As a unique feature Delta4000 also offers ITC, Intelligent Temperature Correction. With ITC the actual temperature correction for a certain measurement object is estimated by measuring an additional frequency sweep after performing the standard single frequency measurement. The information from the sweep test is then used to estimate the correct temperature correction from measurement temperature to 20°C reference (patent pending).
M 27600 – Potential Transformer Basic Form Information The PF Potential Transformer form is used for power/dissipation factor testing high voltage potential transformers, those generally rated over 5kV. Nameplate information (serial number, ratings, etc.) should be entered which identifies the asset being tested, and general information regarding the test conditions (test date, weather conditions, etc.) should also be noted.
Delta 4310 User Interface Testing When testing is ready to be performed, the test can be started by; Right-click the desired blue highlighted test number or press F2 when the actual test row is activated (highlighted in yellow) or for Delta4310 press the “Test” button when the actual test row is activated and click “Start” on the pop-up screen or press enter key to start generating the test voltage. The proper connections for the programmed tests are described below.
M Supplemental Tests Test 7 - This tests the inter-winding insulation between primary (H) and secondary (X). Short H1 to H2 and short X and Y windings to themselves. Connect HV cable to H, Red lead to X and Blue lead to Y. Test mode is UST-R. Test 8 - This tests the inter-winding insulation between primary (H) and secondary (Y). Short H1 to H2 and short X and Y windings to themselves. Connect HV cable to H, Red lead to X and Blue lead to Y. Test mode is UST-B. Test 9 - This is a cross check test.
Delta 4310 User Interface Bushing Hot Collar Tests 15 to 26 - These tests measure the outer shell insulation of the bushings, including surface leakage and leakage current from the bushing surface through the insulating material to the center conductor. A conductive strap is placed around the bushing, below one of the skirts and connected to the HV lead. The Red lead is connected to the bushing conductor. Test mode is GST-GND. Multiple hot collar tests can be performed on each bushing.
M 27610 – Current Transformer Basic Form Information The PF Current Transformer form is used for power/dissipation factor testing high voltage current transformers, those generally rated over 5kV. Power factor testing is normally not conducted on doughnut style current transformers. Nameplate information (serial number, ratings, etc.) should be entered which identifies the asset being tested, and general information regarding the test conditions (test date, weather conditions, etc.) should also be noted.
Delta 4310 User Interface Testing When testing is ready to be performed, the test can be started by; Right-click the desired blue highlighted test number or press F2 when the actual test row is activated (highlighted in yellow) or for Delta4310 press the “Test” button when actual test row is activated and click “Start” on the pop-up screen or press enter key to start generating the test voltage. The proper connections for the programmed tests are described below.
M Hot Collar Tests 12 test lines are provided on this form for Hot Collar Tests on the primary bushing(s), if desired. These tests measure the outer shell insulation of the bushings, including surface leakage and leakage current from the bushing surface through the insulating material to the center conductor. A conductive strap is placed around the bushing, below one of the skirts and connected to the HV lead. The Red lead is connected to the bushing conductor. Test mode is GST-GND.
Delta 4310 User Interface 91510 – Miscellaneous Equipment Basic Form Information The PF Miscellaneous Equipment form is used for power factor/dissipation factor testing any type of electrical equipment, especially those types where a specific test form is not available. It allows flexibility in the number of tests that are performed, as well as allowing the user to select the specific test mode necessary for any testing situation.
M Apparatus nameplate information (serial number, ratings, etc.) may be documented to identify the asset being tested, and general information regarding the test conditions (test date, weather conditions, etc.) should also be noted. Liberal use of the COMMENTS field at the bottom of the form is recommended for documenting this information.
Delta 4310 User Interface 92500 - Air-Magnetic Circuit Breaker form Basic Form Information The PF Air-Magnetic Circuit Breaker form is used for power factor testing medium voltage air magnetic circuit breakers. These are normally encountered in 5kV and 15kV switchgear. Test modes are mentioned in the description of tests below. However, the test form is pre-programmed with the appropriate test modes to automatically be performed.
M Description of Tets Circuit Breaker Overall Tests Prior to the overall insulation tests, remove the breaker from its cubicle or cell. Tests may be performed either with or without arc chutes installed. This should be noted in the Comments field for future reference. The breaker will remain in the open position for all tests. Tests 1 to 6 (C1G, C2G, C3G, C4G, C5G, C6G) - These are measurements of the ground insulation of each pole of the breaker with the breaker in the open position.
Delta 4310 User Interface 92510 - Oil Circuit Breaker form Basic Form Information The PF Oil Circuit Breaker form is used for power factor testing medium and high voltage bulk oil circuit breakers. These are typically found in transmission and distribution substations. Oil circuit breakers usually utilize condenser bushings with test taps which should be routinely tested whenever the overall insulation of the breaker is tested. Test modes are mentioned in the description of tests below.
M Description of Tests Circuit Breaker Overall Tests Tests 1 to 6 are conducted with the circuit breaker in the open position. Tests 7 to 9 are conducted with the breaker in the closed position. Tests 1 to 6 (C1G, C2G, C3G, C4G, C5G, C6G) - These are measurements of the ground insulation of each pole of the breaker with the breaker in the open position. Test 1 is indicated by Insulation Tested C1G, Test 2 by Insulation Tested C2G, etc.
Delta 4310 User Interface Tests 22 to 24 - These are tests of oil samples taken from each phase of the breaker (either 1 or 3). Each sample of oil is tested separately in an accessory oil test cell. Follow oil cell instructions for details on cell cleaning and filling. Record the temperature of the oil sample in the Nameplate section at the top of the form. Test mode is UST-R.
M Description of Tests Circuit Breaker Overall Tests Test 1 (C1G) - This is a measurement of the ground insulation on Pole 1 with the circuit breaker in the open position. All other poles on the breaker will be floating (no connection). The HV cable will be connected to the bushing top terminal. No LV lead connection is required. The frame of the breaker must be connected to station ground. Test mode is GST-GND.
Delta 4310 User Interface Test 8 (C34) - This is a measurement of the insulation on Phase 2 (B) between Pole 3 and Pole 4 with the circuit breaker in the open position. All other poles on the breaker will be floating (no connection). The HV cable will be connected to the bushing top terminal of either Pole 3 or 4. The LV Red lead is connected to the other Pole. The frame of the breaker must be connected to station ground. Test mode is UST-R.
M Bushing Tests SF6 dead tank circuit breakers occasionally utilize condenser bushings with test taps which should be routinely tested whenever the overall insulation of the breaker is tested. The table supplied may be used to measure the C1 insulation on condenser bushings, if so equipped. The HV lead is connected to each bushing top terminal, in turn, and the LV Red lead is connected to the respective bushing test tap. For all tests, test mode is UST-R.
Delta 4310 User Interface 92530- Vacuum Circuit Breaker Basic Form Information The PF Vacuum Circuit Breaker form is used for power factor testing medium and high voltage vacuum circuit breakers. These are normally encountered above 5kV in both switchgear and outdoor substation applications. Test modes are mentioned in the description of tests below. However, the test form is pre-programmed with the appropriate test modes to automatically be performed.
M Description of Tests Circuit Breaker Overall Tests Prior to the overall insulation tests, remove the breaker from its cubicle or cell, if applicable. The breaker will remain in the open position for all tests. Tests 1 to 6 (C1G, C2G, C3G, C4G, C5G, C6G) - These are measurements of the ground insulation of each pole of the breaker with the breaker in the open position. Test 1 is indicated by Insulation Tested C1G, Test 2 by Insulation Tested C2G, etc.
Delta 4310 User Interface 93002 – Multiple Dissipation/Power Factor Quick Test Enter the Asset ID Enter the temperature correction factor (TCF).
M 93500 – Two-Winding Transformer Basic Form Information The PF Two-Winding Transformer form is used for power factor/dissipation factor testing medium and high voltage power transformers, generally those with at least one winding rated over 5kV.
Delta 4310 User Interface Description of Tests Transformer Overall Tests Prior to the overall insulation tests, short all high side (H) bushings together and short all low side (L) bushings together, keeping both windings separated. Remove ground connections from neutral bushings. Test 1 - This is a measurement of the insulation between the transformer high voltage winding and the transformer tank, plus the insulation between the high voltage winding and the low voltage winding, both measured in parallel.
M NOTE: Once Tests 5, 6 and 7 are completed, Line 8 will populate with values calculated by subtracting Test 6 from Test 5. This is applicable for values of capacitance, current and watts. Line 8 is a calculated comparison to the direct measurements of Test 7. Values on these two lines should be essentially the same. If they are not, re-check all connections and verify the proper operation of the test set.
Delta 4310 User Interface conductor and its test tap (capacitance tap). If a bushing does not have a test tap, then the C1 measurement is not performed. NOTE: These tests may be performed with the bushing shorting leads still in place from the overall insulation tests. This allows all the high side bushing C1 tests to be performed without having to move the HV lead from bushing to bushing. It will still be necessary to move the Red lead to the individual test taps for each test.
M Bushing C2 Tests Bushings with test taps may also be tested to obtain a C2 insulation measurement. The C2 insulation is the insulation between the test tap connection and the bushing mounting flange. To perform a C2 test, the HV lead is carefully connected to the bushing test tap and the Red lead is connected to the bushing center conductor. Care should be taken not to cause physical damage to the test tap, as the tap connection point may be a small pin or a flexible spring.
Delta 4310 User Interface Tests 28 to 36 are measurements of the arrester insulation. Only test voltage, current and watts are recorded for arresters. The HV lead is attached to the arrester HV terminal. No connection using the Red or Blue leads is necessary. The Test Mode used is GST-GND. Once the HV lead is connected, right-click on the blue highlighted field on the desired test line to initiate the test sequence. Follow the onscreen instructions to complete the test.
M Exciting Current Tests Measurements of the individual phase excitation current values are valuable in determining defects in the transformer core and coils. Excitation current measurements are generally performed on the high voltage winding only, to minimize the amount of current required. NOTE: All bushing shorting leads must be removed for exciting current measurements. If the low voltage winding has a neutral, connect the neutral bushing as it normally is in-service (grounded or ungrounded).
Delta 4310 User Interface NOTE Exciting current measurements are pending voltage level. Make sure use same voltage level as in earlier measurements on same transformer. Exciting current may also vary due to core magnetization status, exciting current measurements should be performed prior winding resistance measurement or after demagnetization. Ratio Tests Measurements of transformer winding ratio can be made with a high voltage power factor test set when a TTR capacitor is available.
M It is also possible to use Delta Control for controlling the test by clicking the Delta Control button (above the table) in PowerDB form, Delta Control will send all data to be stored in the Multiple Quick Test table.
Delta 4310 User Interface 94500 – Three-Winding Transformer Basic Form Information The PF Three-Winding Transformer form is used for power factor/dissipation factor testing medium and high voltage power transformers, generally those with at least one winding rated over 5kV. Nameplate information (serial number, ratings, etc.) should be entered which identifies the asset being tested, and general information regarding the test conditions (test date, weather conditions, etc.) should also be noted.
M Test 3 - This is a measurement of the insulation between the transformer high voltage winding and the low voltage winding. Connections are exactly the same as for Test 1 and 2. Test mode is UST-R. NOTE: Once Tests 1, 2 and 3 are completed, Line 4 will populate with values calculated by subtracting Test 2 from Test 1. This is applicable for values of capacitance, current and watts. Line 4 is a calculated comparison to the direct measurements of Test 3.
Delta 4310 User Interface Test 11 - This is a measurement of the insulation between the transformer tertiary winding and the high voltage winding. Connections are exactly the same as for Test 5 and 6. Test mode is UST-R. NOTE: Once Tests 9, 10 and 11 are completed, Line 12 will populate with values calculated by subtracting Test 10 from Test 9. This is applicable for values of capacitance, current and watts. Line 12 is a calculated comparison to the direct measurements of Test 11.
M Tests 20, 21, 22, and 23 are C1 measurements for the low side (L) bushings. Test 23 is used only if the high winding has a neutral bushing with a test tap. Test mode is UST-R. Tests 24, 25, 26, and 27 are C1 measurements for the Tertiary (T) bushings. Test 27 is used only if the high winding has a neutral bushing with a test tap. Test mode is UST-R. NOTE: Many condenser bushings will have factory values for C1 stamped on their nameplates, both for power factor and capacitance.
Delta 4310 User Interface NOTE: Similar to the bushing C1 tests, all the C2 measurements may be made with the bushing shorting leads still in place from the transformer overall tests. Bushing Hot Collar Tests Hot collar tests are generally performed on HV bushings that do not have test taps.
M Turns Ratio Tests Measurements of transformer winding ratio can be made with a high voltage power factor test set when a TTR capacitor is available. Depending on the voltage rating of the winding being energized, tests can be made up to 10kV. The significance of this is that higher volts per turn can be applied to the winding, stressing the winding turn-to-turn insulation more than low voltage ratio test sets.
Delta 4310 User Interface secondary tap setting. Unless conditions warrant, future tests may be reduced to the tap settings as found. For each test line on the form, document the DETC (De-Energized Tap Changer) and LTC (Load Tap Changer) tap settings and perform three tests per form line. On WYE / Y connected transformers, connections would be H1-H0 / U-N /A-N, H2-H0 / V-N / B-N and H3-H0 / W-N /C-N.
M 96005 – CABLES Because of the many variations of cable installations, this test form is designed for flexibility in capturing test information and results. Included is a normal "header" where location and test conditions are recorded, as well as a Cable Nameplate area for detailing specific information about the cable to be tested. To allow for flexibility, the test table in this form is designed to grow by a line with every test added.
9 Delta 4310 User Interface The testing procedures for the two versions of Delta4000 are principally the same. Delta4110 is operated from an external computer running Power DB Lite and Delta Control SW. Delta4310 has an internal computer with pre-installed Power DB On-board and Delta Control SW. Power DB On-board has the same functionality as Power DB Lite but the test forms are adapted to the smaller screen and the SW has support for the specific shortcut keys and buttons available on the 4310.
M Top Panel Test Button: Initiates and Terminates Testing Navigation Keys: Use Arrow keys to highlight a desired Selection. Use Enter button (in center) to Activate the Selection. Home Key: Toggles HOME Action Icons Zone Key: Allows User to select Active area of the screen. Keypad: Key board for entering notes and data. Power Suspend: Prepares the Instrument for Shutdown.
Delta 4310 User Interface Communications Ports Ethernet port USB Storage/Print Figure 9: Communications ports 4310 Joystick The Joystick is weather-sealed with “left” and “right” buttons, similar to a ‘mouse’. The middle of the joystick contains the controls for the pointer and buttons for the ‘left’ (top) and ‘right’ (bottom) click. The TEST button has the same functionality as the ‘Start’ button on the instrument.
M Home Action Icons Select to create NEW test Select to RECALL test Select to SAVE Test. Select to ZOOM-IN Select to ZOOM-OUT Print Icon. Prints the Selected Test Form. Printer driver is factory installed. Please contact Megger for specific printer model availability. Select to enter PREFERENCES screen Figure 10: HOME Action Icons Utility Icons Cancel Icon. Select to Cancel without Saving. Delete Icon. Deletes the Selected File or Report. Print Icon. Prints the Selected Report.
Delta 4310 User Interface USB Out Icon. Select to Transfer Files or Reports from external USB Memory Stick to the TTR. USB In Icon. Select to Transfer Files or Reports from the TTR to the external USB Memory Stick. Back Icon. Select to return back to the previous screen.
M Action Icons Select NEW TEST to open new form Select memory) RECALL to open test from memory (either internal or USB Use Zone Key to move cursor to various zones on display Figure 15: Select File Manager -Recall Test SAVE to save test to memory 81331 Rev 01 Nov 2010 92
Delta 4310 User Interface Figure 16: File Manager –SAVE Test screen 81331 Rev 01 Nov 2010 93
M Select PREFERENCES to set global parameters Use Zone Key to tab Figure 17: Global Settings – Preferences screen Owner: User specified field SN: Serial Number of Test Instrument Units: Units of Measure setting Language: Indicates displayed language Save File Prefix: All Saved files will begin with this prefix % Error limit: Sets error limit Equivalent reading: Sets voltage level to display “equivalent reading” level Default form: Indicates default form, upon power-up Select PRINT to
Delta 4310 User Interface Use SPACE bar to select OPTIONs Use Zone key to tab Figure 18: PRINT 81331 Rev 01 Nov 2010 95
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10 Maintenance and Calibration Maintenance Maintenance should be performed only by qualified persons familiar with the hazards involved with high-voltage test equipment. Read and understand Section 2, Safety, before performing any service. Routine maintenance is all that is required for these test sets. The cables and connector panel should be inspected frequently to be sure all connections are tight and all ground connections intact. DISCONNECT the MAINS plug before cleaning.
M A calibration kit is provided as an optional accessory. This allows for traceable calibration locally without sending the unit to factory. Factory calibration is of course also available. Contact your local Megger representative for details Recommended calibration interval is 1-3 years. Troubleshooting General Guidelines This section provides general guidelines for basic troubleshooting of the Delta4000.
Maintenance and Calibration 5. With the main breaker OFF, plug the input power cord into the test set AC POWER receptacle and into a three-wire grounded power receptacle having the appropriate voltage and current ratings. 6. Suspend the outboard end of the high-voltage cable in free air so that it is clear of all surrounding objects by at least 3 ft (0.91 m). Use dry nylon rope if available. 7. Start your Delta4000 and use Delta Control (or a PowerDB form) and perform a general GST-GND test.
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