Page 1 INSTRUCTION MANUAL ENGLISH mini-ATOS mini Automatic Transformer Observation System RAYTECH AG, OBEREBENESTRASSE 11, CH-5620 BREMGARTEN, SWITZERLAND Preliminary...
Page 2: Table Of Contents
DC Resistance Test ....................14 4.2.1 Principle .......................14 4.2.2 Temperature Correction ..................15 4.2.3 Resistance Deviation ...................16 Demagnetization ......................17 4.3.1 Raytech SPP Demagnetization Method ...............18 4.3.2 Three-Phase Transformer Demagnetization ............18 Magnetic Balance .......................19 Short Circuit Impedance .....................20 4.5.1 Principle .......................20 4.5.2 Short Circuit Jumpers ..................21 4.5.3...
Page 3 System Info ......................41 Test Objects........................42 Power Transformer .....................42 8.1.1 Windings ......................43 8.1.2 Winding Configuration Autodetect ................46 8.1.3 Nameplate ......................47 8.1.4 General ........................48 8.1.5 Tap Changer ......................50 8.1.6 Electrical Values ....................52 Auto Transformer ......................56 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 3 of 125...
Page 4 13.4 External (6pins version) .................... 111 13.5 Tap Control ....................... 112 Technical Specifications ....................113 14.1 General ........................113 14.2 Accuracies ........................ 114 14.2.1 Turns Ratio Measurement ................. 114 14.2.2 Resistance Measurements ................115 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 4 of 125...
Page 5 Arbitration ......................... 120 Maintenance ........................121 Instrument Cleaning Instruction ................121 How to Insert Paper into Thermal Printer ..............121 Thermal Printer Cleaning instruction ................. 122 Index ..........................123 Contacts .......................... 125 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 5 of 125...
Page 6: Safety Precautions
Failure to comply with these precautions and other specific warnings violates the safety standards of design, manufacture, and intended use. Raytech assumes no liability for the operation and use of this equipment.
Page 7: Before Applying Power
Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to a Raytech service department for service to ensure proper operation and that safety features are maintained.
Page 8 Figure 1: The unsafe area must be specified and restricted with barrier tapes or ropes WARNING! Always keep distance from the test object during the tests and the unsafe area must be specified and restricted with barrier tapes or ropes Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 8 of 125...
Page 9: Unpacking
2 Unpacking The Instrument Cable Bags Measuring Cables H (H0-H3) Measuring Cables X (X0-X3) Safety Ground Cable Power Cord Spare Paper rolls & Fuses USB Memory Stick Instruction Manual (Pre.) Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 9 of 125...
Page 10: Introduction
Raytech engineers. It is designed for a high degree of accuracy and ease of use. This compact and intelligent instrument can perform many routines and advanced tests such as...
Page 11: Calculation And Measurement Methods
This is a useful test to check for shorted turns and also to find probable incorrect settings of tap changers during manufacturing or repairing. The mini-ATOS performs the turns ratio by applying voltage on the high voltage side of each phase and measuring the applied voltage and transformed voltage. Figure 2 represents the very simple schematic of the measuring circuit.
Page 12 Consider that for the current example the number of turns is 93531and 9000 for each primary and secondary winding respectively. The following equations are valid: �� 93531 �� = = 10.3923 �� 9000 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 12 of 125...
Page 13: Relative Error
The calculated error can be compared with a limit value. Generally, there are limit values for the turns ratio relative error. A typical limit value according to IEEE C57.12.00-2010 is 0.5%. This limit value can be used to judge if the test is passed or failed. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 13 of 125...
Page 14: Dc Resistance Test
Figure 4: Summarized schematic of mini-ATOS winding resistance measuring circuit The mini-ATOS has two power supplies with the same output power which can be used to measure both high and low voltage side winding simultaneously.
Page 15: Temperature Correction
The mini-ATOS winding resistance circuit is also equipped with heavy-duty discharge circuits that are very unique in design to dissipate the stored energy in the transformer windings. 4.2.2 Temperature Correction The DC resistance measured values can be corrected to the desired reference values by employing the following equation based on IEEE C57.12.90:...
Page 16: Resistance Deviation
Please note that if the temperature of phases is not the same during the resistance measurements, the deviation values may be higher. In this case, it is better to calculate the deviation values of the temperature-corrected resistances. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 16 of 125...
Page 17: Demagnetization
Figure 5: A) A real example of a demagnetization with mini-ATOS. B) Closer look at the same curve in A. Preliminary 90297-0.24 Instruction Manual mini-ATOS...
Page 18: Raytech Spp Demagnetization Method
Figure 5-A shows an actual example of a hysteresis curve during demagnetization which is performed using the mini-ATOS. Figure 5-B is a closer look at the same curve. The depicted parameters are described below: Ф [ �� ] : Magnetic flux with the unit of volt-seconds or weber. It will be measured as integral of the inductive part voltage over time.
Page 19: Magnetic Balance
4.4 Magnetic Balance Raytech mini-ATOS performs the magnetic balance test by applying AC voltage on each winding of the three-phase transformer from the high voltage side and measuring induced voltage into other windings on the same side. The applied voltage produces magnetic flux in the core which is distributed to other parts of the core and induces a voltage into other windings.
Page 20: Short Circuit Impedance
× 100% �� [Ω] �� [ % ] = �� × 100% �� [Ω] �� [ % ] = �� × 100% �� Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 20 of 125...
Page 21: Short Circuit Jumpers
The reason for this is that the resistance of the mini-ATOS test cable is much higher compared to the resistance of the windings, which can affect the measurement. Special jumper cables designed for this purpose can be ordered as optional accessories from Raytech.
Page 22: Dynamic Resistance Measurement (Drm)
Because of these transition resistors, there is a current drop during switching process which can be investigated by DRM test. Typical DRM curve of a resistive type OLTC can be seen in Figure 6. The mini-ATOS calculate the parameters listed in Table 3 for each DRM curve.
Page 23 Figure 6: Typical DRM curve of a resistive type OLTC During the dynamic resistance measurement, it is possible to short circuit the other transformer sides. In this way, the current drop is much bigger. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 23 of 125...
Page 24: Oltc Motor Drive Current
Many mechanical and control problems of OLTC can be detected by the drive motor current. The mini-ATOS can measure this current by utilizing a current clamp. This test can be performed simultaneously with DRM. The measured current then would be shown as graph like Figure 7 for comparing and the parameters according to Table 4 will be calculated.
Page 25: Measurement Setup
5.1 Connecting Test Cables to Transformer Terminals This chapter explains the measurement setup of power transformers and auto transformers. Connect the mini-ATOS to the test object terminals with the labelled test leads by using the connection guides according to Table 3 or Table 4.
Page 26 Table 6: Test cables connection guide for a three-phase power transformer and auto transformer mini-ATOS Transformer Naming Scheme Voltage Level Test Cable IEEE ABCN Label Primary Secondary Tertiary Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 26 of 125...
Page 27: Operation Elements
Two 5mm x 20mm T10A slow blow fuses protects the device. Use only the same type for replacement. c- Press the Mains Switch to turn the mini-ATOS ON/OFF. 6.2 Ethernet Interface This port can be used for remote access. Please see chapter 10.7 for more information about the remote connection.
Page 28: Protective Earth Terminal
Turn clockwise to release. The device will remain in the safe state. 6.7 Display and Touch Panel The mini-ATOS can be easily controlled by this touch screen panel. Since it is a capacitive touch screen, use your finger to control it as you work with a smartphone.
Page 29: Temperature Channels Receptacles
6.14 Temperature Channels Receptacles These 5 receptacles are for connecting the external temperature probes. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 29 of 125...
Page 30: User Interface
On the home screen, easy access to the main parts of the operation menu is provided. Figure 8 represents the mini-ATOS home screen. Figure 8: The mini-ATOS home screen By tapping the Home icon from any page, you will jump to the Home Screen Archive button, which is used to access all previously defined test objects.
Page 31 Connection and vector group Test object name Last measuring date Jump to the last active measurement window Test object serial number Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 31 of 125...
Page 32: Archive
7.2 Archive In Archive, a list of already defined test objects is shown (Figure 9). Figure 9: The mini-ATOS test objects Archive To activate the multiselect to export or delete test objects Filter the test object records Arrange the test object records by sorting them according to different fields Search tool to find a test object from the list.
Page 33 The selected inspection title The selected test plan measurement sides The test plan measurement item The measurement type The last measuring date and time To open the result view in graph and table Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 33 of 125...
Page 34 The measurement setting The total tests possible for the measurement To open the option menu To open the measurement view To open the result view in graph and table Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 34 of 125...
Page 35: Templates
To create a new template Template item The template winding configuration Template name Date created When it is marked, it will be shown on the home screen To open the option menu Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 35 of 125...
Page 36 To open the template and edit the template test plan To delete the template To edit the template To clone or make a copy from the template To create a test object from the template Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 36 of 125...
Page 37: Settings
CSV separator is helpful for software like excel to correctly show results as data columns from the exported results in CSV format. Depending on the PC language, sometimes comma [,] is the separator and sometimes semicolon [;] is the separator. Figure 13: Regional adjustments in Setting Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 37 of 125...
Page 38: Naming Scheme
In this tab (Figure 15), you can adjust the networking settings which are required for remote access. For more information about remote access please see chapter 10.7. Figure 15: Network configuration Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 38 of 125...
Page 39: Remote Access
(4 digits) if the field is left empty. The generated code will be shown on the login page on the device screen. To find out how to control the device with remote access, please see chapter 10.712. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 39 of 125...
Page 40: Maintenance
10min. Service Codes When there is a problem or error in the device, the Raytech service team may ask you to use the service codes. With service codes, it is possible to do some additional actions which are not possible to do by using the default software.
Page 41: License
Each license may be valid for a limited time like 10 days or can be unlimited. To test a feature, you can ask Raytech for a trial license to activate the feature temporarily. Figure 18: License manager 7.4.8...
Page 42: Test Objects
Tap the Save icon to store all the entered test object data and go to the test plan. Cancel By tapping this icon, you can cancel the test object defining and go back to the Home Screen. Please take care because all the entered data will not save. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 42 of 125...
Page 43: Windings
The winding type for a power transformer can be from any winding type of Table 7. Table 7: Winding types and symbols for power transformer Letter Letter Phases Type Symbol (Primary) (non-Primary) Delta Star with accessible neutral 3-Phases Star Zigzag with accessible neutral Zigzag 1-Phase Single-phase Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 43 of 125...
Page 44 It is also possible to detect just the vector group quickly by using this button. It detects only the vector group and not the winding configuration. Figure 22: Detect vector group Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 44 of 125...
Page 45 When there is a tertiary winding, the check box can be selected and like the secondary winding, the required information can be entered (Figure 24). Figure 24: Defining a transformer with a Tertiary winding Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 45 of 125...
Page 46: Winding Configuration Autodetect
The actual configuration is written on the left side, and the detected configuration will be written on the right side (See Figure 26). When mini-ATOS find more winding configurations, a list of them will be provided and you can choose each of them. After detection, you can accept the detected configuration or you can cancel.
Page 47: Nameplate
By tapping each text field, the keyboard will be opened and the data can be easily entered. The nameplate data is optional to enter. It is also possible to add this information later by editing the test object. Figure 27: Test object Nameplate tab Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 47 of 125...
Page 48: General
(chapter 7.4.3). When a custom naming scheme is required, it can be easily defined in the Naming Scheme window (Figure 29) which can be opened using the pencil icon. Figure 29: Custom Naming Scheme window Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 48 of 125...
Page 49 The temperature coefficient which is required for the temperature correction can be set here for each winding. If a custom coefficient is required, the value can be added using the plus icon. For more details about the temperature coefficient, please see chapter 4.2.2. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 49 of 125...
Page 50: Tap Changer
WARNING! Do not select OLTC type for a DETC tap changer! Keeping DC current on during tap changing of a DETC may damage the DETC contacts which cause a transformer failure! Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 50 of 125...
Page 51 Tap Control If you connect the mini-ATOS tap control output to the tap changer control unit, choose Yes. The tap changer position then can be changed manually or automatically from the mini-ATOS. To find out how to connect the tap control cable, please refer to chapter 13.5.
Page 52: Electrical Values
12517 67000 14235 13335 12436 65325 14154 13254 12354 63650 14072 13172 12272 13990 13090 12190 13908 13008 12108 13826 12926 12026 13745 12845 11945 13663 12763 11863 13581 12681 11781 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 52 of 125...
Page 53 To match the calculated values to nameplate values, it is also possible to say the wizard how to round the calculated values. The default value is 1, which means that all calculated values round to the nearest natural number. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 53 of 125...
Page 54 To match the calculated values to nameplate values, it is also possible to say the wizard how to round the calculated values. The default value is 1, which means that all calculated values round to the nearest natural number. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 54 of 125...
Page 55 Finally, there is a Preview, which shows how will be the labels by using the wizard. Figure 34: Labels wizard window Figure 35 shows also how to fill the wizard for the secondary side of the example. Figure 35: filling the labels wizard for the example Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 55 of 125...
Page 56: Auto Transformer
8.1. However, the possible winding configurations are according to Table 9. Table 9: Winding types and symbols for auto transformer Letter Letter Phases Type Symbol Symbol (Primary) (Secondary) Star with accessible neutral 3-Phases Star 1-Phase Single-phase Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 56 of 125...
Page 57: Inspection And Test Plan
In the lifetime of a high voltage asset, usually a measurement or group of measurements have to be performed periodically and also sometimes occasionally. The aim is to inspect the health condition or to detect the suspected failures. In mini-ATOS, each group of measurements is called a Test Plan which forms an Inspection.
Page 58 Note that when you select another pair of winding, the measurement setup must be changed according to chapter 5.1. Figure 38: Test plan for Pri: Ter pair, which is selected from the drop-down list located above. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 58 of 125...
Page 59 Here it is possible to edit the inspection name, enter the weather condition and write additional notes like the reason for the inspection as remarks for later references. Figure 39: Inspection information Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 59 of 125...
Page 60: Measurements
The calculated relative error in %; green means that the relative error is less than the error limit and the test is passed otherwise it is red and failed Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 60 of 125...
Page 61 The stop button can be used to stop the test. Please note that it takes time to stop the test Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 61 of 125...
Page 62 Figure 43 shows on the other hand the secondary view mode. This time for each of the primary taps, there is table with 33 secondary taps (5 tables, each 33 taps). The primary selected tap is also shown on the top and it is possible to change it. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 62 of 125...
Page 63: Turns Ratio Settings
+ button. The user defined voltage can be any voltages between 2VAC and 250VAC. The maximum acceptable ratio error can also be adjusted by editing the Max Error field. The default value according to standards is 0.5%. Figure 44: Turns ratio settings Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 63 of 125...
Page 64: Turns Ratio Results View
Result view includes graphs and table. Figure 46 shows the turns ratio graph view. From the drop- down list on top right, it is possible to select various graphs. These are turns ratio, voltage ratio and error graph. Figure 46: Turn ratio graph results view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 64 of 125...
Page 65 Figure 47 shows also the turns ratio table results. By tapping the TR or the Rated TR column header, it is possible to switch between turns ratio and voltage ratio values. Figure 47: Turns ratio table results view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 65 of 125...
Page 66: Winding Resistance
The deviation value from the 3 phases average; green means the deviation is less than the limit and the test is Passed. See chapter 4.2.3 for more information The measured test current which was used Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 66 of 125...
Page 67 Open the detailed results in table view or graphs Start test button to perform the measurement Test mode to select which phase to test (A, B, C, ABC, Run Test Taps) Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 67 of 125...
Page 68 When the ambient temperature is above 40°C, Continuous mode winding resistance measurement, specially with maximum output power, must be limited to 30 minutes and before the next measurement a cooldown time of 30 minutes is required. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 68 of 125...
Page 69 (Figure 50). Figure 50: Winding resistance measurement view for the Secondary Figure 51 is the live graph which shows the live resistance curve over the time. Figure 51: Winding resistance live graph Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 69 of 125...
Page 70: Dual Supply Winding Resistance
The actual tap position of the non-primary side (if it contains a tap changer) The selected current that injects into the non-primary winding side The measurement table view of the non-primary side To enable or disable the temperature corrected resistances view for non-primary Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 70 of 125...
Page 71: Winding Resistance Settings
By tapping on the plus button, you can add a user-defined test current to the list of the test currents INFO: Do not select currents more than 10% of the test object nominal current for each side. Otherwise, current will increase the temperature and hence resistance of the winding. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 71 of 125...
Page 72 When there is an external temperature probe, the External switch should be enabled. The reading value must be also entered manually. The mini-ATOS use the average of all activated temperature values for the temperature correction. In the live temperatures window (Figure 55) which can be opened from the bottom-left corner of measuring screen, you can see the actual temperature values.
Page 73 When continuous mode is “On Request”, one can activate the continuous mode only by tapping on the continuous button. When mode is “Always”, the continuous mode is always activated automatically. The maximum acceptable deviation value. Please see chapter 4.2.3 for more information Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 73 of 125...
Page 74: Winding Resistance Result View
Figure 58 shows also the Primary (Ph-Ph) table results. By tapping the DevCorr column header, it is possible to switch between deviation for measured values or temperature corrected values. Figure 58: Winding resistance table results view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 74 of 125...
Page 75: Auto Transformer Winding Resistance
10.2.4 Auto Transformer Winding Resistance Mini-ATOS has special winding resistance measurement for Auto Transformers. The parameters and method of measurements are summarized in Table 10. The method of measurements in Table 10 are for phase A of a star-null auto transformer.
Page 76 The deviation values of each parameter from the 3 phases average; green means the deviation is less than the limit and the test is Passed. See chapter 4.2.3 for more information Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 76 of 125...
Page 77 Here, you can select which parameter or parameters to be measured not as a function of any tap changer. For this measurement you can also select the desired test current Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 77 of 125...
Page 78: Winding Resistance Interval
The phase and the corresponding connections which be used automatically by the instrument to test each side and also the tap position Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 78 of 125...
Page 79 Here you can open the live graph to see the live resistance curve over the time The output current bars indicate the actual value of the output current for each channel and specify the terminals used for current injection The actual elapsed time Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 79 of 125...
Page 80: Winding Resistance Interval Settings
But no resistance will be measured To select the current that injects into the secondary winding side and also to turn On or turn Off the power supply for the secondary side Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 80 of 125...
Page 81 27, 30, 40, 50...seconds The temperature settings of the winding resistance interval are the same as winding resistance settings. Please see chapter 10.2.2, Temperature settings part, to see the explanation. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 81 of 125...
Page 82: Winding Resistance Interval Result View
Figure 65: Winding resistance interval graph results view Figure 66 shows also the Primary table results. Figure 66: Winding resistance interval table results view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 82 of 125...
Page 83: Demagnetization
The measured initial remanence flux in % (as the percentage of the measured maximum remanence flux) The measured final remanence flux in % (as the percentage of the measured maximum remanence flux) Zoom out Zoom in Maximize the graph view Centre the graph view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 83 of 125...
Page 84 The stop button can be used to stop the test. Please note that it takes time to discharge and stop the test WARNING! After measurement stop, it takes time to discharge the test object! Wait until the device mode changes to safe mode before any other action! Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 84 of 125...
Page 85: Demagnetization Settings
20 steps. Normally, to reach a smaller final remanence flux and hence better demagnetization quality, you can select more steps. However, since the mini-ATOS use the Raytech SPP method (See chapter 4.3.1 for more information), the quality of the demagnetization is quite good even when the number of Steps is set to Very Fast (8 Steps).
Page 86: Magnetic Balance
Print the results by using the thermal printer Open the detailed results in table view or graphs Start test button Test mode to select which phase to test (A, B, C, ABC) Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 86 of 125...
Page 87 The warning symbol shows that it is not safe to touch the cables and test clamps The highlighted cell shows the actual measurement The stop button can be used to stop the test. Please note that it takes time to stop the test Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 87 of 125...
Page 88: Magnetic Balance Settings
Figure 72 represents the magnetic balance measurement settings. Figure 72: Magnetic balance measurement settings For magnetic balance, the applying voltage can be selected up to 50VAC. Please note that the test voltage frequency is at 10Hz. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 88 of 125...
Page 89: Magnetic Balance Result View
Figure 73 shows the graph view. Figure 73: Magnetic balance graph results view Figure 74 shows also the table results including the colored bar. Figure 74: Magnetic balance table results view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 89 of 125...
Page 90: Short Circuit Impedance
The measured temperature during the measurement or the reference temperature when resistance is corrected The deviation from 3 phases short circuit impedance average; green means the deviation is less than the limit and the test is Passed. See chapter 4.5.4 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 90 of 125...
Page 91 The instrument keeps performing the test on the phase under the test until the user action The stop button can be used to stop the test Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 91 of 125...
Page 92: Short Circuit Impedance Settings
5 temperature channels to record. When there is an external temperature probe, the External switch should be enabled. The reading value must be also entered manually. The mini-ATOS use the average of all temperature values for the temperature correction. Preliminary 90297-0.24 Instruction Manual mini-ATOS...
Page 93 When continuous mode is “On Request”, one can activate the continuous mode only by tapping on the continuous button. When mode is “Always”, the continuous mode is always activated automatically The maximum acceptable deviation value. Please see chapter 4.5.4 for more information Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 93 of 125...
Page 94: Dynamic Resistance Measurement
The current tap position, which is indicated by a black background The current drop in %. You can also select it by clicking on it, and the results will be displayed upon selection Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 94 of 125...
Page 95 Tap Changing: Automatic For automatic tap changing, the mini-ATOS tap control output must be connected to the tap changer control unit for both directions. In the transformer profile, Tap Changer tab, the tap control must be also activated.
Page 96 Figure 83: Tap Switch message during DRM manual tap changing Auto Reverse When auto reverse is On, the mini-ATOS continue measurement for the opposite direction when it reaches to one of the end taps. Preliminary 90297-0.24 Instruction Manual mini-ATOS...
Page 97 The system message to inform user or ask user action regarding the next tap position The stop button can be used to stop the test. Please note that it takes time to discharge and stop the test Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 97 of 125...
Page 98 Figure 85: Tap changer motor live graph Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 98 of 125...
Page 99: Dynamic Resistance Measurement Settings
The recovery time is the time it normally takes for the current to return to normal level and stabilize after the tap position is changed. The next transition measurement is not started until this time has elapsed. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 99 of 125...
Page 100 Figure 87: DRM dynamic settings To select the expected trigger level To select whether the mini-ATOS should short circuit the other side. The mini-ATOS will automatically engage the internal multiplexer for short circuiting To adjust the recording time of each transition Preliminary 90297-0.24 Instruction Manual mini-ATOS...
Page 101 To select the tap changer motor, working voltage frequency To input the rated current of the tap changer motor. It is not necessary to enter a higher value to account for the inrush current. The mini-ATOS automatically utilizes a higher measuring range to accurately measure the inrush value Preliminary 90297-0.24 Instruction Manual mini-ATOS...
Page 102: Dynamic Resistance Measurement Result View
Figure 89: DRM graph result view You can also compare DRM graphs of three phases (Figure 90) by choosing the DRM single tap (ABC) view. Figure 90: DRM graph 3ph single tap result view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 102 of 125...
Page 103 Figure 91: DRM and motor current graph result view You can also see the stairs view as Figure 92. Figure 92: DRM stair graph view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 103 of 125...
Page 104 Figure 93 and Figure 94 are showing the table views of DRM and motor current results. Figure 93: DRM table result view Figure 94: Motor current table result view Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 104 of 125...
Page 105: Go Taps
Tap Changing: Automatic For automatic tap changing, the mini-ATOS tap control output must be connected to the tap changer control unit for both directions. In the transformer profile, Tap Changer tab, the tap control must be also activated.
Page 106 To confirm, it is possible to tap the confirm button on the screen, and it is also possible to use a hand switch which must be connected to the mini-ATOS External terminal. Figure 97: Tap Switch window during manual tap changing Preliminary 90297-0.24 Instruction Manual mini-ATOS...
Page 107: Remote Access Instruction
PC and tablets. The remote connection is possible with the USB or the network connection. When the device is connected, the mini-ATOS can be accessed by using any web browser. For optimal operation, we recommend using Google Chrome or Microsoft Edge browser.
Page 108 Figure 99: Remote access activated with an auto-generated key on the mini-ATOS display Figure 100: Remote access login page Notes You can always cancel the remote connection from the device Only one active session is possible at once If the access code is auto-generated, by entering a wrong access code each time, a new code will be generated.
Page 109: Interfaces
USB memory sticks. It is also possible to connect a USB mouse and a USB keyboard for easier input. The Slave connector can be used to connect the mini-ATOS to a PC or to connect a USB printer. USB-Master (Type A) x2 USB-Slave (Type B) 13.2 Ethernet...
Page 110: External (4Pins Version)
When both hand switch and warning lamp is required then a splitter cable is necessary as follows which can be ordered as an optional item: Cable adapter hand switch & warning lamp (4pin to 2x 4pin) Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 110 of 125...
Page 111: External (6Pins Version)
Cable adapter external Cable adapter hand switch/ warning lamp (6pin to 6pin & 4pin) (4pin to 2x 4pin) Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 111 of 125...
Page 112: Tap Control
This port is used for an external connection to a tap changer dry contact. With this connection, changing the tap position can be done from the mini-ATOS. Two connectors are for changing the tap position in up direction and the other two are for changing the tap position in down direction.
Page 113: Technical Specifications
IP20 L: 525 mm (20.7”) W: 437 mm (17.2”) H: 213 mm (8.4”) Size Weight (instrument) 16.5 kg (36.4 lbs.) Weight (accessories) Please contact Shipping weight and package size Please contact Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 113 of 125...
Page 114: Accuracies
4 Digits @ 55Hz Phase Angle ±90° ±0.05° Rdg ± 1 LSD 4 Digits or 0.01° @ 55Hz 0 – 250VAC Output Voltage ±1% ± 1 LSD 4 Digits or 0.1VAC Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 114 of 125...
Page 115: Resistance Measurements
5 Digits 1kΩ … 10kΩ < 50mA ±1% Rdg ± 50Ω 5 Digits 14.2.3 Temperature Measurement Table 15: Output voltage accuracy Range Accuracy Resolution 0 – 70°C ±0.2°C ± 1 LSD 0.1°C Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 115 of 125...
Page 116: Standards And Approvals
IEC 61000-4-2 discharge (ESD) Electromagnetic field IEC 61000-4-3 Burst IEC 61000-4-4 Immunity industrial Surge IEC 61000-4-5 electromagnetic environment Conducted RF IEC 61000-4-6 Power frequency IEC 61000-4-8 magnetic field Voltage dip IEC 61000-4-11 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 116 of 125...
Page 117: Appendix
Appendix mini-ATOS mini Automatic Transformer Observation System Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 117 of 125...
Page 118 Arbitration ......................120 Maintenance ........................ 121 Instrument Cleaning Instruction ................121 How to Insert Paper into Thermal Printer .............. 121 Thermal Printer Cleaning instruction ..............122 Index ........................... 123 Contacts ........................125 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 118 of 125...
Page 119: A Warranty Conditions
A Warranty Conditions Raytech AG Switzerland shall at their option and expense, repair or replace any part or parts that prove to be defective within the warranty limitation period- irrespective of the operating time of the test equipment provided that the cause of the defect occurred before the time at which the risk was passed.
Page 120: Arbitration
All disputes arising out of or in connection with the contract between the purchaser and Raytech AG Switzerland and including those regarding the legal validity of this contract and this arbitration clause shall be settled out of court and shall be referred to arbitration for final decision.
Page 121: B Maintenance
Unwind a few cm (inch) of paper from the roll. • Keep the layers wound tightly when inserting the paper roll into the paper tray. The paper outside shows towards the printer mechanism. Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 121 of 125...
Page 122: Thermal Printer Cleaning Instruction
Soak Q-tip with isopropanol (IPA) and clean the sensor, platen roll and print head rail, as well as further dirt. • Other strong contaminations may also be removed with a Q-tip soaked with isopropanol (IPA). Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 122 of 125...
Page 123: C Index
Safety precautions ..............................5 Service codes ................................. 31 Smart pattern predictor ............................17 Software update..............................31 SPP method ................................17 Stability condition ..............................57 Standards and approvals ............................81 Start current ................................67 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 123 of 125...
Page 124 Turns ratio measurement ............................. 10 Turns ratio measurement view ..........................49 Unsafe area ................................7 Voltage ratio ................................10 Winding configuration autodetect ........................37 Winding resistance measurement view ........................ 54 X-Side current................................ 57 Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 124 of 125...
Page 125: D Contacts
D Contacts Raytech Switzerland Your local representative Raytech AG Oberenbenestrasse 11 5620 Bremgarten Phone:+41 56 648 6010 Fax: +41 56 648 6011 Mail: welcome@raytech.ch Web: www.raytech.ch Preliminary 90297-0.24 Instruction Manual mini-ATOS Page 125 of 125...

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