Download
Share
Print this page
  1. Manuals
  2. Brands
  3. NDB Technologies Manuals
  4. Test Equipment
  5. CTT Series
  6. User manual

NDB Technologies CTT Series User Manual

Current transformer tester
Hide thumbs

Advertisement

Quick Links

Download this manual
NDB TECHNOLOGIES INC.
CTT series - Current Transformer Tester
MU016-GEN-ENG Version 5.1
CTT Series
User Manual

Advertisement

loading
Need help?

Need help?

Do you have a question about the CTT Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for NDB Technologies CTT Series

Summary of Contents for NDB Technologies CTT Series

  • Page 1 NDB TECHNOLOGIES INC. CTT series - Current Transformer Tester MU016-GEN-ENG Version 5.1 CTT Series User Manual...
  • Page 2 C T T S e r i e s U s e r M a n u a l Table of Contents 1. Contact Us ..........3 2.
  • Page 3 C T T S e r i e s U s e r M a n u a l 1. Contact Us Phone 1 (418) 877-7701 Address 1405 St-Jean-Baptiste Avenue, suite 111 Quebec, QC G2E 5K2 Canada Web Site www.ndbtech.com Technical Support 1 (418) 877-7701 9AM to 4PM, Eastern Time (GMT -5)
  • Page 4 Technologies. • Safety is the user’s responsibility. In no event shall ndb Technologies be liable for any direct, indirect, punitive, incidental, special consequential damages, to property or life, whatsoever arising out of or connected with the use or misuse of it’s products.
  • Page 5 C T T S e r i e s U s e r M a n u a l • Do not attempt to disassemble the device or its accessories. Only qualified personnel can perform maintenance. • Prior to using the CTT, a careful inspection should be made to ensure the unit is free from any contaminants and that there are no apparent physical damages.
  • Page 6 C T T S e r i e s U s e r M a n u a l 3. Introduction The CTTx5 and CTTx2 are designed to efficiently perform current transformer testing. The CTT design is focused on providing the results required for commissioning and maintenance of protection class CT's.
  • Page 7 C T T S e r i e s U s e r M a n u a l 4. Material This section shows the CTT instruments and their accessories. Item Part number Description Illustration Five tap current transformer tester. CTTx5 Configured for either 120V or 240V (cannot be changed).
  • Page 8 C T T S e r i e s U s e r M a n u a l USB 2.0 A Male to B Male 28/24AWG ACC-054 Cable DB9 cable male to female ACC-009 3m (10ft) ACC-074 4GB USB key drive Nylon bag for cable set NDB-10 56 x 41 cm (22 x 16 inches)
  • Page 9 C T T S e r i e s U s e r M a n u a l 5. Overview This section describes the CTTx5 and CTTx2 interface. CTTx5 CTTx2 10 11 12 13 1. Fuse socket*: Contains the main fuse. The fuse socket must stay in the orientation set by the factory.
  • Page 10 C T T S e r i e s U s e r M a n u a l 5. Secondary terminals: The secondary (X) terminals will apply a voltage to the secondary side of the CT under test and will sense the resulting voltage. Secondary terminals configuration is the main difference between the CTTx5 and CTTx2 models: a.
  • Page 11 C T T S e r i e s U s e r M a n u a l 6. Navigation 6.1 Navigation Knob 1. Main screen loop: Rotate the knob to toggle between the save button, test plan, drop down menu and test number selection field. 2.
  • Page 12 C T T S e r i e s U s e r M a n u a l 7. User Interface Overview 7.1 Tabs Overview 7.1.1 F1-Test tab (CTTx5 only) The F1-Test tab found on the CTTx5 is where all tests (in automatic mode) will be performed.
  • Page 13 C T T S e r i e s U s e r M a n u a l 7.1.3 F2-CT Info tab The F2-CT Info tab is where the operator fills in the CT's information. Note the serial number field is mandatory prior saving a measurement.
  • Page 14 C T T S e r i e s U s e r M a n u a l 7.1.5 F4-Table tab The F4-Table tab displays every measurement sample (voltage and current) taken while performing the saturation test, for every ratio combination.
  • Page 15 C T T S e r i e s U s e r M a n u a l 7.1.8 Manual Mode Tab Overview The CTTx5 and CTTx2 features a manual mode which is helpful for quick CT testing that do not require to be saved, exported or printed.
  • Page 16 C T T S e r i e s U s e r M a n u a l 7.2 Configuration Menu Overview The configuration menu regroups all the parameters of the CTT instrument along with its data exportation and file management features. 7.2.1 Menu - Operation Mode The CTTx5 and CTTx2 can be configured in one of the three available modes:...
  • Page 17 C T T S e r i e s U s e r M a n u a l 7.2.2 Menu - USB Key • The CTTx5 and CTTx2 can export test data on a USB key. Not all keys are compatible.
  • Page 18 C T T S e r i e s U s e r M a n u a l 7.2.4 Menu - System The system menu contains all CTT parameters. • Date/Time: Set the time and date. Time and date will be used to time-stamp a test records when it is saved to memory.
  • Page 19 USB cable, the correct communication must be selected. • Language: Select the preferred language. • About: Displays information of ndb Technologies, software version and the instrument serial number. The factory reset is also performed from the about menu, refer to section 11.4.
  • Page 20 C T T S e r i e s U s e r M a n u a l 8. Operation 8.1 Manual Mode Operation This section explains how to operate the CTTx5 and CTTx2 in manual mode. It is assumed the CT under test is not installed in a power transformer, circuit breaker or any other larger system.
  • Page 21 C T T S e r i e s U s e r M a n u a l 8.1.2 Manual mode test sequence This section describes how to configure the CTT for manual testing of a current transformer. 1. Press the Menu key. 2.
  • Page 22 C T T S e r i e s U s e r M a n u a l 8.2 Automatic Mode Operation This section explains how to operate the CTTx5 and CTTx2 in automatic mode. It is assumed the CT under test is not installed in a power transformer, circuit breaker or any other larger system.
  • Page 23 C T T S e r i e s U s e r M a n u a l 8.2.2 Device under test information 1. Press the Menu key. 2. Selection Mode - Automatic. 3. Go to the F2-CT Info tab. 4.
  • Page 24 C T T S e r i e s U s e r M a n u a l 6. For each tap to be tested, adjust the ratio either by rotation the knob, or by typing in the ratio value. Do not leave a ratio value in an unused field. This could result in improper voltage distribution across ratio tests.
  • Page 25 C T T S e r i e s U s e r M a n u a l 8.2.4 Run a test 1. Go to F1-Test tab. 2. Open the drop-down menu (CTTx5 only). 3. Select the appropriate test plan (CTTx5 only). 4.
  • Page 26 C T T S e r i e s U s e r M a n u a l 8.2.5 Save a test 1. When a test sequence is completed, the operator can choose to save the results to memory. 2.
  • Page 27 C T T S e r i e s U s e r M a n u a l 8.3 Burden Mode Operation This section explains how to operate the CTTx5 and CTTx2 in burden mode. 8.3.1 Connections 1. Before connecting the CTT instrument to any other cable/equipment, make sure the ground post is earthed properly using the provided ground cable.
  • Page 28 C T T S e r i e s U s e r M a n u a l 8.3.2 Burden mode test sequence The burden test can be performed on its own, but some operators may find convenient to attach the burden test results to an actual CT test report. In order to do that, make sure a CT test has been completed in automatic mode, but wasn't saved yet.
  • Page 29 C T T S e r i e s U s e r M a n u a l 9. Applications This section of the user manual describes how to connect the CTT instrument in various test configurations. Important safety note (Applies to all applications described in this section): CT's secondary leads should not be left opened when the CT is installed and not in use.
  • Page 30 C T T S e r i e s U s e r M a n u a l However, if the CT under test is in the "Buried in Delta" configuration, do not short. Refer to section 9.2. Opposite windings are shorted to ground 4.
  • Page 31 C T T S e r i e s U s e r M a n u a l 9.2 Buried CT in Delta Winding This section explains how to connect the CTTx5 and CTTx2 to test a current transformer installed within the windings (buried) of a delta configuration of a power transformer.
  • Page 32 C T T S e r i e s U s e r M a n u a l 4. Since the CT is buried in the transformer's windings, it is necessary to activate the "Buried in Delta" mode from the Menu. From the F1-Test tab, a delta icon is now present to indicate the proper compensation is applied to the ratio measurement.
  • Page 33 C T T S e r i e s U s e r M a n u a l 9.3 Testing CT's in Shunt Reactor This section explains how to connect the CTTx5 and CTTx2 to test a current transformer installed in a high voltage shunt reactor. When performing tests on CT's located on power transformer bushings, we use magnetic short-circuiting of power transformer winding impedances.
  • Page 34 C T T S e r i e s U s e r M a n u a l 9.3.2 Step 2 - Ratio Test This section describes how to perform ratio tests of a CT installed on a shunt reactor.
  • Page 35 C T T S e r i e s U s e r M a n u a l 9.3.2.2 X1-X3 Test 1. Connect the test leads as shown on the figure below. 2. Run a ratio test. 3. Using the name plate information where we have the full winding (X1-X5) that has 400 turns ratio divided by (X1-X3) 240 turns, the expected result is 1.666.
  • Page 36 C T T S e r i e s U s e r M a n u a l 9.3.2.3 X1-X4 Test 1. Connect the test leads as shown on the figure below. 2. Run a ratio test. 3. Using the name plate information where we have the full winding (X1-X5) that has 400 turns ratio divided by (X1-X4) 300 turns, the expected result is 1.333.
  • Page 37 C T T S e r i e s U s e r M a n u a l 9.3.2.4 X1-X5 Test 1. Connect the test leads as shown on the figure below. 2. Run a ratio test. 3. Using the name plate information where we have the full winding (X1-X5) that has 400 turns ratio divided by (X1-X5) 400 turns, the expected result is 1.
  • Page 38 C T T S e r i e s U s e r M a n u a l 9.4 CT in Circuit Breaker This section shows how to connect the CTTx5 or CTTx2 to test a current transformer installed on a circuit breaker. 9.4.1 Cover Method If the circuit breaker bushings have a metal protective cover housing the CT's, it is possible to use that cover for the primary connections.
  • Page 39 C T T S e r i e s U s e r M a n u a l 9.4.2 Bushing Terminal Method In order to test a CT installed in a circuit breaker, install the H1 clamp on the bushing (H1 side of the CT), and the H2 clamp on the second bushing (H2 side of the CT).
  • Page 40 C T T S e r i e s U s e r M a n u a l 9.5 Top Core CT This section shows how to connect the CTTx5 or CTTx2 to test a top core current transformer. Make sure to isolate the CT from the network. In order to reduce nearby induction effects, the terminal on which is connected the H2 clamp, must be shorted to ground.
  • Page 41 C T T S e r i e s U s e r M a n u a l 9.6 Potential Transformer (PT, VT) This section explains how to connect the CTTx5 or CTTx2 to test a potential transformer (PT or VT). The CTT is able to perform the following tests on a voltage transformer: Insulation resistance, winding resistance, polarity, phase deviation and ratio.
  • Page 42 C T T S e r i e s U s e r M a n u a l 10. Test Report 10.1 Local Print The CTT instrument allows for test report printing from its built-in thermal printer. 10.1.1 Print an unsaved test 1.
  • Page 43 C T T S e r i e s U s e r M a n u a l 10.2 File Transfer The CTT instrument allows for file transfer to a PC computer for backup purposes and also for test report generation. 10.2.1 RS232 Cable File Transfer The RS232 method allows a transfer of up to 255 files.
  • Page 44 C T T S e r i e s U s e r M a n u a l number when found. If the instrument cannot be found, it is possible to check the assigned port number from the Control Panel - Device Manager - Ports (COM&LPT).
  • Page 45 C T T S e r i e s U s e r M a n u a l 10.3 Test Report in Report Manager 1. On a PC computer, start Report Manager. 2. Click Files - Open - CTT data files. 3.
  • Page 46 C T T S e r i e s U s e r M a n u a l 11. Annexes 11.1 Max Test Voltage Setting This section describes how to select the appropriate max voltage for a CT saturation test, and what are the problems associated with improper test voltage setting.
  • Page 47 C T T S e r i e s U s e r M a n u a l 11.1.1 Voltage Set Too High Using the same example CT requiring only 400V to saturate its largest ratio, only this time max test voltage was set to 2000V. This has for effect of reducing the instrument's accuracy while plotting the saturation graph.
  • Page 48 C T T S e r i e s U s e r M a n u a l 11.1.3 Determining Max Voltage If maximal voltage to use isn't known, it is recommended to use the manual mode to perform a quick saturation test. •...
  • Page 49 C T T S e r i e s U s e r M a n u a l 11.2 Induction Mitigation Nearby high-voltage electric fields can force current to flow through the loop of the measurement circuit (depending on their strength, distance, and geometry). The larger the exposed (unshielded) part of this loop, the larger the area sensitive to induced currents.
  • Page 50 C T T S e r i e s U s e r M a n u a l 11.3 Auto-Transfo Effect This section explains what is the auto-transformer effect and how the CTT protects from it. The CTT has a built in protection against any voltages higher than 2700 VAC on its input X connectors.
  • Page 51 40 characters, 80mm (3.12 inches) Operating temperature -10 to 50°C (14 to 122°F) Storage temperature -20 to 80°C (-4 to 176°F) Dimensions 46.8 x 35.5 x 19.3cm (18.4 x 13.8 x 7.5 inches) Weight 24.94kg (55lbs) EN61010:2001 Approvals EN61326-1:1997 ndb Technologies 2020...

This manual is also suitable for:

Cttx5Cttx2