HVTest HTJS-V Manual Download Page 9 | Manualshive

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9

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.

Step-up transformer: the output of variable frequency power

supply is stepped up to the measuring voltage. The maximum

reactive power output is 2KVA/one minute.

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Summary of Contents for HTJS-V

Page 1: ...y for the inconvenience If you have further questions welcome to contact with our service department The input output terminals and the test column may bring voltage 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 ...

Page 2: ...ched products being damaged In order to avoid possible danger this product can only be used within the scope of the provision Only qualified technician can carry out maintenance or repair work To avoid fire hazard or personal injury Use Proper Power Cord Only use the power wire supplied by the product or meet the specifications of this product Connect and Disconnect Correctly When the test wire is...

Page 3: ...uire 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 Avoid Touching Bare Wire and Charged Conductor Do not touch the bare connection points and parts of energized equipment Do Not Operate with Suspicious Faults If you encounter operating faults susp...

Page 4: ... Security Terms Warning indicates that death or severe personal injury may result if proper precautions are not taken Caution indicates that property damage may result if proper precautions are not taken ...

Page 5: ...rview 6 II Operating principle 7 III Main technical parameters 11 IV Instrument panel 12 V Operating instructions 14 VI Connection 17 VII Precautions 23 VIII Full set of instrument 26 IX Reference connection method 27 ...

Page 6: ...easurement of tgδ and electrical capacity of high voltage electrical equipments in the workshops laboratories and research institutes It could measure non grounded or grounded high voltage equipments adopting positive and negative connection method Besides it could measure the tgδ of capacitor voltage transformer and capacitance of main capacitor C1and C2 The instrument is equipped with high volta...

Page 7: ...his kind of energy loss is called the dielectric loss When AC voltage is applied to the dielectric phase angle difference Ψ exist between the voltage and current of dielectric The δ which is the complementary angle of Ψ is the dielectric 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 ...

Page 8: ... measurement circuit and be collected real time digitally by single chip computer The capacitance value and dielectric loss tangent of the specimen could be obtained through vector operation Anti interference measures are adopted by the instrument so as to make accurate measurement in the interference of external electric field Figure 1 Schematic Diagram of Measurement Principle ...

Page 9: ...y 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 Step up transformer the output of variable frequency power supply is stepped up to the measuring voltage The maximum reactive power output is 2KVA one minute ...

Page 10: ...ication precision MPPM digital modem is adopted to transmit the current signal of negative connection to the low voltage side The isolation 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 wo...

Page 11: ...of measurement the measurement circuit would send step down instruction to make the voltage of variable frequency power to be reduced to 0 slowly III Main technical parameters 1 High voltage output 0 5 10kV Increasing by 500V for each level a total of 20 levels capacity 1500VA 2 Accuracy tgδ reading 1 5 0 06 Cx reading 1 5 5 PF 3 Resolution tgδ 0 01 Cx 1pF 4 Measuring range 0 01 tgδ 100 3PF Cx 600...

Page 12: ...frequency conversion 7 Harmonic adaptation 3 8 Application condition 15 50 Relative humidity 80 9 Dimension 460 L 345 W 350 H 10 Weight 35 kg IV Instrument panel 1 The diagram for control panel Figure 2 and high voltage backplane Figure 3 Figure 2 ...

Page 13: ...n input wire could be unconnected or hung Earth connection measurement it is connected with the shell In the positive and negative measurements the instrument could be reliably and independently grounded The grounding conductor cannot be painted or rusty It should be wiped clean and make sure zero resistance grounding Poor grounding could cause errors or data fluctuation If it is severe it may cau...

Page 14: ...ng P positive connection N negative connection D different frequency W working frequency and other contents Indicator display indicating menus measurement information measurement results Sun exposure for long time should be avoided Brightness adjustment adjusting the contrast degree of screen V Operating instructions The dielectric loss of high voltage winding for low voltage winding and shell in ...

Page 15: ...on mode which is shown in Figure 5 Pressing the ENT the cursor would go to the Connection mode P it could be adjusted to Connection mode N pressing ESC the cursor would go to the first line and then pressing it would be moved down to the Measuring voltage which is shown in Figure 6 Pressing the ENT the cursor would go to the Measuring voltage 0 5KV pressing the voltage could be Measuring method W ...

Page 16: ... being measured please wait which is shown in Figure 8 After about 40 seconds the measurement would be completed The high voltage would be cut off automatically and the screen would display the measurement results which is shown in Figure 9 It is being measured please wait Dielectric loss tgδ 0 42 Capacitance 1000P Measuring method D Connection mode N Measuring voltage 10KV Start to measure Freque...

Page 17: ...ive connection should be adopted The red special high voltage cable should be led out from the HVx which is on the back of the instrument the high voltage shielded cable should be connected with the high voltage terminal of equipment under test The black special low voltage cable should be led out from Cx which is on the panel of instrument the low voltage core should be connected to the low volta...

Page 18: ...egative connection should be adopted The red special high voltage cable should be led out from the HVx which is on the back of the instrument the high voltage core should be connected with the high voltage terminal of equipment under test The low voltage terminal should be grounded see Figure 12 At this time the input line of Cx is vacant The core of HVx is not allowed to be shortened with the shi...

Page 19: ...igure 12 Negative Connection Method Connection Method 3 CVT self excitation measurement the bus is not grounded connection mode is CV Key wiring diagram Actual wiring diagram 1 Measurement C2 the wiring is shown in Figure 13 ...

Page 20: ...ENT Pressing or selecting CV and then pressing ESC D Moving the cursor to Measure voltage and choosing 1KV and pressing ESC moving the cursor to Start to measure pressing ENT and waiting for the display of results If the results need to be printed out pressing ENT 2 Measuring C1 the wiring is shown in Figure 14 The basic operation is the same as that of measuring C2 3 Note The C1 and C2 can only b...

Page 21: ...asurement point N with other connection disconnected components The high voltage line 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 ...

Page 22: ...dering the voltage division effect of series of C2 or C1 with internal C1 its capacitance should be calibrated according to the following formula Cc the empirical value for calibration includes the effect of Cn and high voltage line for earth capacitance Its value could be 110pF ...

Page 23: ...ed This method may change the distribution of electric field in the internal equipment under test and then affect the tgδ Both the standard capacitor and standard dielectric loss tester adopt this kind of connection method 5 The connection method of some equipment can refer to Section IX Reference of connection methods VII Precautions 1 The instrument is only used on power off equipment The ground...

Page 24: ...onding menu option 5 Under the special circumstances of endangering safety during the testing the main power supply could be switched off 6 The connection mode could be changed or the work is done after the power switch on the panel is switched off and the 220V test power is disconnected If the equipment needs to be retested you can press the reset or select repeat after the completion of previous...

Page 25: ...1 After the starting of the instrument except in special circumstances the power is not 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 sh...

Page 26: ...f the instrument You need to restart the instrument reduce the measurement voltage and make measurement 16 The instrument has automatic protection feature if it has short circuit 17 If the paper is extended out from the paper exit on the top of the printer you need to press the button to stop it The printing paper could be pulled out VIII Full set of instrument 1 Host 1 2 High voltage HVx test cab...

Page 27: ...ansformer 1 Primary side to secondary side A See Figure 6 B Voltage 2kV C Positive connection 2 Primary side to secondary side and ground A See Figure 7 B Voltage 2kV C Negative connection 3 Secondary side to primary side and ground A See Figure 8 B Voltage 2kV C Negative connection 2 Current transformer 1 Primary side to secondary ...

Page 28: ...10kV C Positive connection 3 Primary side to secondary side and ground A See Figure 10 B Voltage 10kV C Negative connection 3 High voltage wall bushings 1 Core to end shield and ground A See Figure 11 B Voltage 10kV C Negative connection 4 Power transformer 1 Primary winding to secondary winding the neutrals are not grounded A See Figure 12 ...

Page 29: ...nection 5 Dielectric loss of insulating oil A Positive connection 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 Standard capacitor and dielectric loss tester 1 Positive connection A High voltag...

Page 30: ...connected to Cx shielding cable and grounded D See Figure 16 2 Negative connection A High voltage is grounded B Low voltage connected to HVx core Red terminal C E connected to HVx shielding cable Black terminal D See Figure 16 E Insulation is necessary ...

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