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HVTest HT-TC, Руководство пользователя

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25

Appendix

Chart of common velocity on the cable(Ref)

unit

：

m/

μs

name

model

Test cable

velocity

Hi-Fre cable

HEQ

－

2527×4×1.2

＋

6×0.9

Gap of cables

232m/μs

other

240

～

244m/μs

HEQ

－

2521×4×1.2

Gap of cables

248/μs

HDYFLE22

－

156

Gap of cables

224m/μs

other

230m/μs

Lo-Fre cable

HEQ212×4×12

Gap of cables

240m/μs

other

248m/μs

Oil immersed

communicating

insulating cable

in lead

ZUQ

6KV3×703×150

Core-core

160m/μs

PVC insulating

cable

VLZ

3×120

＋

1×35

1KV3×50

＋

1×16

Core-core

178m/μs

PVC insulating

cable

VKV20

1KV3×50

Core-core

172m/μs

Mi-coaxial cable

4×2.6/9.4

Core-screen

283m/μs

Sm-coaxial cable

4×1.2/4.4

Core-screen

274m/μs

Local cable

0.5×50

Core-core

196m/μs

0.4

Core-core

190m/μs

0.32

Core-core

182m/μs

Opening cable

Core-core

288m/μs

Содержание HT-TC

Страница 1: ...n find the changes in the appendix Sorry 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 vol...

Страница 2: ...r relevant subassembly to damage In order to avoid possible danger this product can only be used within the prescribed scope Only qualified technician can carry out maintenance or repair work To avoid...

Страница 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 prod...

Страница 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 tak...

Страница 5: ...ng Method 9 IV High Voltage DC Flashover Method 11 V High Voltage Impulse Flashover Method 12 VI Fundamantal Principle and Composition 13 VII Panel Controlling and Keymanual s Function 15 VIII Instrum...

Страница 6: ...ed electronic devices and with computer and special electronic technology combining our company s successful experience of long time exploitation on cable fault measuring testing instruments and it is...

Страница 7: ...gh speed data sampling the speed of A D is 100MHz and makes resolution ratio of 1m and testing dead zone of 1m 1 3 High intelligent The testing results automatically show by wave form and data on the...

Страница 8: ...e parameters 2 1 Scope of application and using purpose The instrument can test all kinds of electric cable voltage of 1KV 35KV and the Short Circuit Grounding Leakage of High Resistance High Resistan...

Страница 9: ...t but not the length of the line In the symmetrical transportation line the resistance input equals the unique resistance at any point If the load of terminal equals the unique resistance the current...

Страница 10: ...below V is the speed of the electric wave of the line and is related to the linear circuit parameter and constant to an case which can be detected by the instrument and calculated by computer When the...

Страница 11: ...point is first been sparked over forming the flashover and we can use the electric arch added to the voltage to form a short circuit reverse The reverse wave at the input terminal forms the open reve...

Страница 12: ...er electirc arch At the input terminal of cable we detect the inductance L to read the reverse wave The circuit principle graph is as below Electric wave reverse at the fault point and reverse by L at...

Страница 13: ...capture and displaying the einmal transient wave The instrument applies the technology of digital storing using the high speed A D converter to get sample and converts the transient analog signal to...

Страница 14: ...done by microprocessor concludes data sampling data storing data filtration cursor moving distance computing graph comparing graph size changing and displaying on the LED And it also can depend on nee...

Страница 15: ...Panel Controlling and Keymanual s Function 1 On off control the power of the device on or off Press the button the device has the power and displayer will show the window of operations 2 Mode press i...

Страница 16: ...he display scale by pressing the decrease increase key VIII Instrument use fault test method 1 Fault type detect Before the test cable fault first determine the type of fault in order to determine whi...

Страница 17: ...e impulse button to send the test pulse the screen to get reflected waves 7 Press the button to move the cursor to the start of the reflected wave If the reflected wave is not well discriminated adjus...

Страница 18: ...the gain and retransmit the pulse make the front of the most steep reflection wave I Press or to move the measuring cursor to the leading edge of the reflected wave and the upper left corner of the s...

Страница 19: ...ectric cable Preventative spark over testing usually applies this method C The time of the high voltage current flashover method varies and the short one can exist for some times The wave form is simp...

Страница 20: ...ises heavily and the indicator in voltage meter also alters heavily The wave form as below should be on the screen From the graph the interval of t1and t2 should be the distance of the fault points F...

Страница 21: ...d the high voltage testing equipment whether has a good water resistance and voltage divider C Connect the devices as below The ground line works as 8 2 6 and 9 3 The capacity in it is demanded higher...

Страница 22: ...Waveform comparison method A Disconnect all equipment from the cable under test B Connect the normal cable to the output port of the tester C Use the low voltage pulse method to read the measurement w...

Страница 23: ...and assuage the process of discharging After the voltage of capacitor is low it can discharge directly to the ground until the voltage is zero If discharging in seconds the instant current can reach...

Страница 24: ...ard in the host is faulty 1 Adjust contrast knob 2 Contact the supplier Boot there are images but no emission waveform 1 Contrast adjustment improperly 2 The circuit board in the host is faulty 1 Adju...

Страница 25: ...able HEQ212 4 12 Gap of cables 240m s other 248m s Oil immersed communicating insulating cable in lead ZUQ 6KV3 703 150 Core core 160m s PVC insulating cable VLZ 3 120 1 35 1KV3 50 1 16 Core core 178m...

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