HVTest HTJS-V User manual

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Dear Client,
Thank you for Purchasing our HTJS-V Tan Delta Test Set.
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. You can 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 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 Road，East Lake High-tech Development
Zone，Wuhan
Sales Hotline: [phone]
After Service Hotline: [phone]
Fax: [phone]
E-mail: [email protected]
Website: www.whhuatian.com

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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.
SAFETY REQUIREMENTS
Please read the following safety precautions carefully to avoid
personal injury and to prevent the product or any other attached
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 connected to the charged terminal, please do
not connect or disconnect the test wire at will.
Grounding
The product is grounded through the power cord; besides, the
ground pole of the shell must be grounded. To prevent electric

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shock, the grounding conductor must be connected to earth ground.
Before making connections to the input or output terminals of the
product, please do check that the product is properly grounded.
Pay Attention to the Ratings of All Terminals
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.
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/suspect there is damage to this
product, do not continue. Please contact with our maintenance
staff.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in Explosive Atmospheres.
Ensure Product Surfaces Clean and Dry.

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－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.

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Contents
I. Overview......................................................................................... 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

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I. Overview
HTJS-V Tan Delta Test Set 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.
The whole process is measured automatically through
microcomputer.
The instrument also applies to the measurement 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 voltage step-up
transformer. Besides, it takes security measures like zero-cross
closing, lightning protection, etc. During the experiment, different
levels of high voltage ranging from 0.5KV to 10kV are outputted.
The instrument has the advantages of convenient and safe
operation.

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Under the circumstance of oil dielectric loss ≥ 0.01%, with oil
cup, positive wiring can be used to measure the dielectric loss of
oil.
This following protection features are not included in this
instrument:
• High voltage short-circuit protection
• CVT over-voltage protection
• Poor grounding protection
II. Operating principle
Under the AC voltage, the dielectric would consume a part of
electrical energy that would be converted to heat energy leading to
loss. This 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 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.
The tested loop is composed of specimen and measurement circuit.

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The measurement circuit is composed by sampling resistance,
pre-amplifier and A/D converter. The current amplitude and phase
of standard loop and tested loop can be measured by the
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

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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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Standard capacitor: internal Cn. It is the measuring basis.
Cn current detection: it is used to detect the internal standard
capacitor current, 10μA ~ 1A. The input resistance is <2Ω.
CX positive connection current detection: it is only used for the
measurement of positive connection, 10μA ~ 1A. The input
resistance is <2Ω.
CX negative connection current detection: it is only used for
the measurement of negative connection, 10μA ~ 1A. The input
resistance is <2Ω.
Negative connection digital isolation communication: 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 would send the actual measured high
voltage to the variable frequency power, finely adjust the low
voltage and realize the accurate high-voltage output. According to
the setting of positive and negative connection, the measurement
circuit would automatic select the input and switch the range based

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on testing current. Fourier transform is adopted for filtering out
interference so as to separate the fundamental wave of signal,
make vector operations of the standard current and specimen
current, and calculate the capacitance and the tgδ. After repeated
measurements, the intermediate result would be selected. After the
completion 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 <60000PF
When it is 10KV, Cx ≤ 30000PF
When it is 5KV, Cx ≤ 60000PF
5. Power supply: AC 220V ± 10% 50 ± 1Hz
6. Measuring method: a.working frequency:50Hz

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b.different frequency:45Hz/55Hz Automatic
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

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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 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.
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 cause danger.
Internal high-voltage allowable: Turning on this switch, high
voltage would be outputted. Turning off the switch, high voltage will
not be generated in the inner and will not be outputted.

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Main power switch: Turning on this switch and the indicator
would display the measuring content.
Keyboard: "ESC", "ENT", “ ”, “ ”
"ESC": denial of the content where the cursor is located or the
content has been completed.
"ENT": Once recognition of the content where the cursor is
located, you can press this key to confirm and move the cursor to
other place.
“ ”, “ ”: Changing the value or changing 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 the measurement of power transformers is an
example. The negative connection should be adopted (see the
diagram of negative connection method). After checking the proper

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connection of the instrument with power transformer, D(different
frequency) and 10KV voltage should be selected for measurement
and the following operations should be made.
①Turn on the main power switch, the display of the screen of
instrument is shown in Figure 4.
②Pressing the "ENT", the cursor would go to the "Measuring
method □ W", pressing “ ”,“ ”, it could be adjusted to
"Measuring method □ D", pressing "ESC", the cursor would go to
the first line, and then pressing “ ”, it would be moved down to
the "Connection mode" which is shown in Figure 5.
③Pressing 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.
④Pressing the "ENT", the cursor would go to the "Measuring
voltage □ 0.5KV", pressing “ ”,“ ”, the voltage could be
□Measuring method W
Connecting mode P
Measuring voltage 5KV
Start to measure
Measuring method D
□Connection mode P
Measuring voltage 5KV
Start to measure
Measuring method D
Connection mode N
□Measuring voltage 10kv
Start to measure
Figure 4 Startup display
Figure 5 Connecting Mode
Figure 6 Voltage Measurement

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adjusted among 0.5,1.0,1.5,2.0,2.5……9.5～10KV, pressing "ESC",
the cursor would go to the first line, and then pressing “ ”, it
would be moved down to the " □ Start to measure" which is shown
in Figure 7.
⑤Turning on the "high voltage allowable" switch, pressing
"ENT", the instrument would
begin to produce high voltage output accompanied by the hint
sound of "beep", at this time, the screen would show " It is being
measured, please wait…" which is shown in Figure 8.
⑥After 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
Frequency: W
Connection mode: N
Voltage: 10KV
Dielectric loss: tgδ=0.42%
Capacitance：1000P
Figure 7 Start to measure
Figure 8 Measuring
Figure 9 Measurement Result Figure
Figure 10 Printing Results

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If the results need to be printed out, you need to press "ENT".
It is shown in Figure 10.
⑦In the boot screen, pressing the "ESC" then 40 sets of
historical data could be checked.
VI. Connection
Proper connection method should be selected in accordance
with the grounding of tested equipment.
1. P(Positive connection)
If the low-voltage measuring terminal or secondary port of
equipment under test is ground insulated, positive 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-voltage terminal L of equipment under test
(see Figure 11). The low-voltage shielded cable should be
connected to the shielding terminal E of equipment under test. (If
shielding terminal is unavailable, then it could be vacant)

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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. N(Negative connection)
If the low-voltage measuring terminal or secondary port of
equipment under test is grounded directly, negative 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
shielded cable. Otherwise, it is impossible to sampling and to
measure.

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Figure 11 Positive Figure 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

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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.
B. Turning on the switches of main power supply and internal
high-voltage allowable of dielectric loss tester.
C. Moving the cursor to the "Connection mode" and pressing
"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 be measured under the
testing mode of CVT; CVT would be damaged in the methods of
positive connection and negative connection!