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Dear Client,
Thank you for Purchasing our UHV-341 Transformer Tan Delta Tester. Please
read the manual in detail prior to first use, which will help you operate the equipment
skillfully.
products, so there may be slight differences between your purchase
equipment and its instruction manual. You can find the changes in the
appendix. Sorry for the inconvenience. If you have further questions,
welcome to contact with our service department.
when you plug in/pull out test line or power outlet, they will cause
electric spark. PLEASE CAUTION RISK OF ELECTRIC SHOCK! To
avoid risk of electric shock, be sure to follow the operating instructions!
Company Address:
T4, No. 1, High-tech 2 Road, East Lake High-tech Development Zone, Wuhan, P.R.China
Sales Hotline: 86-27- 87492243
After Service Hotline: 13871482510
Fax: 86-27- 87803129
E-mail:
qiao@hvtest.cc
Website:
www.cnuhv.com
Our aim is to continually improve and perfect the company's
The input/output terminals and the test column may bring voltage,
1
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Summary of Contents for HVTest UHV-341
- Page 1 Dear Client, Thank you for Purchasing our UHV-341 Transformer Tan Delta Tester. Please read the manual in detail prior to first use, which will help you operate the equipment skillfully. Our aim is to continually improve and perfect the company's products, so there may be slight differences between your purchase equipment and its instruction manual.
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Page 2: Safety Requirements
SERIOUS COMMITMENT All products of our company carry one year limited warranty from the date of shipment. If any such product proves defective during this warranty period we will maintain it for free. Meanwhile we implement lifetime service. Except otherwise agreed by contract. -
Page 3: Security Terms
To prevent the fire hazard or electric shock, please be care of all ratings and labels/marks of this product. Before connecting, please read the instruction manual to acquire information about the ratings. Do Not Operate without Covers Do not operate this product when covers or panels removed. Use Proper Fuse Only use the fuse with type and rating specified for the product. -
Page 4: Table Of Contents
Contents UHV-341 Transformer Tan Delta Tester ............5 I. Overview ......................5 II. Operating principle ..................5 III. Main technical parameters ................8 IV. Instrument panel .................... 9 V. Operating instructions .................. 10 VI. Connection ....................12 VII Precautions ....................20 VIII. Full set of instrument ................21... -
Page 5: Uhv-341 Transformer Tan Delta Tester
UHV-341 Transformer Tan Delta Tester I. Overview UHV-341 Transformer Tan Delta Tester is a kind of instrument with high precision fully automatic measuring the dielectric loss tangent and capacitance of various high voltage electrical equipments in the power plants and substations. The adoption of frequency conversion technology could ensure the accurate measurement in the interference of strong electric field. - Page 6 loss angle. The tgδ which is the tangent of δ is dielectric loss tangent. The value of tgδ is the parameter for measuring the dielectric loss. The measuring circuit of the instrument includes a standard loop (Cn) and a tested loop is (Cx) which is shown in Figure 1. Standard loop is composed of built-in high stable standard capacitor and measurement circuit.
- Page 7 1. Structure Block diagram of instrument structure Measurement circuit: Fourier transform, complex arithmetic, and all other calculations and range switching, variable frequency power control, etc. Control panel: printer, keyboard, indicator and communication transferring. Variable frequency power supply: SPWM switching circuit is adopted to generate and output high-power sine wave stable voltage.
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Page 8: Main Technical Parameters
voltage is 20KV. 2. Operating principle After the measuring is started, the high voltage setting value would be transmitted to the variable frequency power supply that would adjust the output to the setting value by the algorithm of PID. The measurement circuit would send the actual measured high voltage to the variable frequency power, finely adjust the low voltage and realize the accurate high-voltage output. -
Page 9: Instrument Panel
10. Weight: 35 kg IV. Instrument panel 1. The diagram for control panel (Figure 2) and high voltage backplane (Figure 3) Figure 2 Figure 3 Cx specimen input: The specimen current should be inputted when it is positive connected. The core (red clip) should be connected with low voltage terminal of specimen when it is... -
Page 10: Operating Instructions
positive connected. If the shielding electrode is available in the low voltage terminal, the shielded cable (black clip) could be connected; otherwise, it could be hung. When it is negative connection, Cx specimen input wire could be unconnected or hung. Earth connection measurement: it is connected with the shell. - Page 11 measurement and the following operations should be made. ① Turn on the main power switch, the display of the screen of instrument is shown in Figure 4. □Measuring method Measuring method Measuring method Connecting mode □Connection mode Connection mode Measuring voltage Measuring voltage □...
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Page 12: Connection
Measuring method Frequency: Connection mode It is being measured, Dielectric loss: tgδ=0.42% Connection mode: N Measuring voltage 10KV please wait… Capacitance: 1000P Voltage: 10KV □Start to measure Dielectric loss: tgδ=0.42% Capacitance： 1000P Figure 7 Start to measure Figure 8 Measuring Figure 9 Measurement Result Figure 10 Printing Results ⑤... - Page 13 The cores of HVx and Cx are not allowed to be shortened with the shielded cable. Otherwise, it is impossible to sampling and to measure. 2. GST If the low-voltage measuring terminal or secondary port of equipment under test is grounded directly, negative connection should be adopted.
- Page 14 High voltage dielectric loss choose the “Cn50/Cn60” way, when choose the Cn50, select the measurement method 50,when choose the Cn60, select the measurement method 60,The external capacitance parameter must be put into instruments ①Open the total power switch (note: the high voltage switch don't open, don't answer the high tension line) ②Press "ENT"...
- Page 15 The measurement mode is 50, the connection mode is CXP, the voltage is corresponding to the external voltage, and the > 10KV cannot be selected. 5. external high pressure internal standard GST test This method is used when using GST method, internal standard capacitance, and external high voltage.
- Page 16 6. CVT self-excitation measurement 6.1 the bus is not grounded Key wiring diagram CVT（measuring C2 ） CVT（measuring C1） Actual wiring diagram (1) Measurement C2: the wiring is shown in Figure 13 A. the end of junction box is opened to the ground and the secondary wirings are vacant. Record should be made so as to make it restored after the testing.
- Page 17 Note: Point N is the end of capacitor C2, which should be disconnected from other connecting parts during measurement. The Low voltage wire (black clip) should be suspended without contacting the ground. Otherwise, the dielectric loss of high-voltage line to the ground would cause error. Thin cable should be used to connect high-voltage outlet with CVT specimen and should be hung.
- Page 18 Cc, the empirical value for calibration, includes the effect of Cn and high-voltage line for earth capacitance. Its value could be 220pF. 6.2 Bus ground CVT self-excitation method can be wired as shown below.If C1 is a single power-saving capacity, the bus cannot be grounded;If C1 is multi-power-saving capacity, the bus can be grounded, C11 and C12 can be measured by conventional forward and reverse wiring, and C13 and C2 are measured by self-excitation method.
- Page 19 7. The wiring of specimen with small capacitor For small capacitors, when the air humidity is large, the measured value of dielectric loss would be abnormal and unstable as its tgδ is impacted by the surface state. At this time, the shielding ring could be adopted for absorbing the leakage current on the surface of the specimen.
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Page 20: Precautions
VII Precautions 1. The instrument is only used on power-off equipment. The grounding terminal should be connected to the grounding network reliably. The instrument should be used in spacious, safe and reliable place. 2. The equipment under test is shifted to the maintenance state if the high-voltage lead is disconnected from operation state and could be cleaned. -
Page 21: Full Set Of Instrument
allowed to be turned off suddenly to avoid the over-voltage which may destroy the equipment. 12. Although the HVx special high-voltage wire equipped with the instrument is made factory inspection, it still should be far away from human beings and low-voltage test line. Both the high-voltage core and high-voltage shielding cable are not allowed to be grounded and contact with the low potential of the testing circuit. -
Page 22: Reference Connection Method
10. Fuse, printing paper for spare 11.Factory inspection report IX. Reference connection method 1．Voltage transformer （1）：Primary side to secondary side A．See Figure 6 B．Voltage: 2kV C．UST （2）：Primary side to secondary side and ground A．See Figure 7 B．Voltage: 2kV C．GST （3）：Secondary side to primary side and ground A．See Figure 8 B．Voltage: 2kV C．GST... - Page 23 B．Voltage: 10kV C．GST 3．High-voltage wall bushings (1) Core to end shield and ground A．See Figure 11 B．Voltage: 10kV C．GST 4．Power transformer (1) Primary winding to secondary winding (the neutrals are not grounded) A. See Figure 12 B. Voltage: 10kV C. UST (2) Primary winding to secondary winding and ground A.
- Page 24 5. Dielectric loss of insulating oil A．UST B．Lead See Figure 15 C．Voltage: 2kV D ． （ C ） connected to HVx shielding cable (Black terminal) E．（A）connected to Cx core F．（B）connected to Cx shielding cable and grounded G．The cup should be put on the insulating stand and distance of insulation should be kept 6.
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