HVTest HTJS-M User manual

Dear Client
Thank you for Purchasing our HTJS-M Capacitance & Tan-
Delta Tester. Please read the manual in detail prior to first use,
which will help you use the equipment skillfully.
Our aim is to improve and perfect the company's
products continually, 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/draw the test wire
or power outlet, they will cause electric spark.
PLEASE CAUTION RISK OF ELECTRICAL SHOCK!
Company Address:
T4，No. 41, 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.hvtest.cc

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
body injury and prevent the product or other 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 fire and personal injury:
Use Proper Power Cord
Only use the power wire supplied by the product or meet the
specification of this produce.
Connect and Disconnect Correctly
When the test wire is connected to the live terminal, please do
not connect or disconnect the test wire.
Grounding
The product is grounded through the power wire; besides, the
ground pole of the shell must be grounded. To prevent electric
shock, the grounding conductor must be connected to the ground.

Make sure the product has been grounded correctly before
connecting with the input/output port.
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 Circuit and Charged Metal
Do not touch the bare connection points and parts of
energized equipment.
Do Not Operate with Suspicious Failures
If you encounter operating failure, 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.

－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.
.

Contents
I. Foreword .....................................................................................6
II. Security Measures ....................................................................6
III. Testable parameters ................................................................7
IV. Performance features..............................................................7
V. Technical indicators...................................................................9
VI. Measuring method and principle.......................................... 10
VII. Wiring methods for common devices................................. 11
VIII. Introduction to instrument functions .................................. 15
IX. Operation steps of instrument.............................................. 16
X. Notes for site test.................................................................... 18
XI. Instrument detection.............................................................. 20
XII. Discussion on variable frequency measurement.............. 21
XIII. F the instructions on new features .................................... 23
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I. Foreword
Tan-delta Tester is a basic method in insulation test and effectively detect
damp, degradation and partial defect of insulation of electrical equipment. This
method is widely used in electric manufacturing, electric equipment installation,
connection and preventive test. Measurement on dielectric loss of transformer,
mutual inductor, reactor, capacitor, bushing and arrester is the most basic
method to test their insulation property.TKC fully-automatic anti-interference
dielectric loss tester breaks through the traditional bridge testing method and
adopts variable frequency power technology, single chip and modernized
electrical technology to carry out automatic frequency shift, analog-to-digital
conversion and data computing. It features strong anti-interference capacity,
high test speed, high precision, automatic digitization and easy operation. It
adopts high-power switching power supply, which outputs 45Hz and 55Hz pure
sine wave and automatically increase the voltage to a maximum value 10 KV.
It can filter 50Hz interference automatically, and it is applicable to the site test
of substation and other places with large electromagnetic interference. This
methods is extensively applied in dielectric loss measurement of transformer,
mutual inductor, reactor, bushing, capacitor, arrester and others equipments in
power industry.
II. Security Measures
1. Please read this manual carefully before using the instrument.
2. Operator of this instrument should be equipped with the knowledge of
using general electrical equipment and instrument.
3. This instrument is suitable for both indoor and outdoor use and should
be kept away from rainwater, corrosive gas, thick dust, direct sunshine and so
on.
4. The instrument should avoid severe vibration.
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5. Maintenance, care and regulation of the instrument should be
conducted by professionals.
6. Connect the grounding terminal of the instrument with the ground by a
ground wire in a reliable way before any wiring.
7. As the testing equipment may produce HV, the testing personnel should
abide by the safety operation specification strictly to prevent others from
contacting high-voltage component and circuit. Personnel who are directly
engaged in testing must exactly understand the high-voltage test circuit as well
as key points for operation. People other than testing personnel must keep
away from HV testing area and the testing area should be clearly marked with
fence, rope or warning sign.
8. Adjustment and maintenance of the instrument should be conducted in
a no power-up state. Jf power-up is required, the operator must be familiar with
the high-voltage hazardous components of this instrument very well.
9. In case that the fuse is broken, replace it with another identical fuse.
Any fuses of different models or direct use in short circuit is forbidden.
10. In case that the instrument breaks down, turn the power off and check
it one minute later.
III. Testable parameters
The instrument can test the following parameters and display them in
figure:
Capacitance value of tested article CX is in pF or nF, 1nF=1,000pF.
Dielectric loss value of tested article tgδ is displayed with %.
IV. Performance features
1. The instrument adopts complex number current method to measure
capacitance, dielectric loss and other parameters. The measured result is
highly accurate and it is easy to realize automatic measurement.
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2. The instrument adopts variable frequency technology to eliminate
50Hz/60Hz power frequency interference. So a reliable data will be reachable
even under the strong electromagnetic interference.
3. The instrument adopts large screen LCD . In the process of testing,
Chinese menu prompt is visualized and easy to operate.
4. The instrument is easy to operate and the measuring process is
controlled by microprocessor. Once a suitable measuring method is selected,
the data measurement will complete automatically under the control of
microprocessor.
5. The instrument is designed to be an integrated model with reference
capacitor and HV power supply in it, enables site test measurement and
reduces site wiring.
6. The instrument is equipped with CVT testing function, which can
achieve CVT self-exciting testing without external accessories and measure
the capacitance and dielectric loss of C1 and C2 by at a time.
7. GST measurement adopts ivddv technology and avoids unstable data
provided by previous GST measurement.
8. The instrument provides low voltage shell function of GST. When the
bus of 220kV CVT is grounded, dielectric loss measurement can be conducted
for C11 without removing 10 kV GST.
9. The instrument has a function of measuring high-voltage dielectric loss.
It can carry out dielectric loss test with over 10kV with the help of voltage
transformer or series resonance.
10. The instrument has a ground-fault protection function. In case that the
instrument is not grounded or grounded incorrectly, the instrument will refuse
to enter into normal procedure and output HV. As for the over-current
protection function, it will protect the instrument from damage when the tested
article is in a short circuit or breakdowns.
11. The instrument has a function of electric shock protection. When the
instrument operator suffers an electric shock due to incaution, the instrument
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will cut off the HV immediately and thus ensure the security of operator.
V. Technical indicators
Accuracy: Cx: ±（reading×1%+1pF）
tgδ: ±（reading×1%+0.00040）
Anti-interference: Variable frequency anti-interference, the above
accuracy can be reached under 200% interference.
Capacitance range: Internal HV:
3pF～60000pF/10kV 60pF～1μF/0.5kV
External HV: 3pF～1.5μF/10kV 60pF～30μF/0.5kV
Resolution: Maximum 0.001pF, 4 valid figures.
tgδ range:unlimited, 0.001% resolution, automatic identification for
capacitance, inductance and resistance of three tested articles.
Test current range: 10μA～1A
Internal HV: Set voltage range: 0.5～10kV
Maximum output current: 200mA
Buck-bust method: continuous stepless regulation
Test frequency: 45, 50, 55, 60, 65Hz single frequency: 45/55Hz, 55/65Hz,
47.5/52.5Hz automatic double conversion
Frequency accuracy: ±0.01Hz
External HV: In case of UST, maximum test current is 1A, and power
frequency or variable frequency is 40-70Hz
In case of GST, maximum test current is 10kV/1A, and power frequency or
variable frequency is 40-70Hz
CVT self-exciting low voltage output: Output voltage 3～50V, output
current 3～30A
Measuring duration: About 40s, depending on measuring method
Input power supply: 180V ～ 270VAC, 50Hz/60Hz±1%, supplied by
alternating current or generator
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Computer interface: Standard RS232 interface
Printer: WH-A7 mini-type thermal printer
Environment temperature: -10℃～50℃
Relative humidity: <90%
Overall dimension: 460×360×350mm
Weight: 28kg
VI. Measuring method and principle
There are two measuring methods according to whether tested article is
grounded, namely UST measurement and GST measurement. Their principles
are shown in Diagram 1.
HV output terminal Icx R HV output terminal
Icx
10KV o 10KV o
CNICN ～ Cx CNICN ～ CX
o
RNR RN
Cx terminal
(a) UST measurement (b) GST measurement
Diagram 1
By the side of high-voltage power supply 10kV, the HV is distributed into
two branches, one of which is supplied to internal reference capacitor CN.
Dielectric loss of this capacitor is very small and can be basically ignored,
namely pure capacitive current. ICN works as the basic standard of capacitive
current. By the side of Cx tested article, the measured current Icx flows to the
instrument through sampling resistor R. Icx can be decomposed into horizontal
component and vertical component, as shown in Diagram 2 and tgδ value can
be determined by calculating ratio of horizontal component and vertical
component.
Cx in Diagram 1(a) is ungrounded tested article. Current of tested article
Icx flows to sampling resistor R though its terminal, then the total current value
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is determined. Cx in Diagram 1(b) is grounded product, and Cx terminal in the
instrument is grounded directly. Icx flows from HV terminal of tested article to
sampling resistor in the instrument, thus the total current value is determined.
(a) Current vector method (b) Equivalent circuit of tested article
Diagram 2
VII. Wiring methods for common devices
1. Explanation for instrument leading-out terminal:
HV —— HV terminal of measuring leading cable of instrument (with
dangerous voltage).
CX ——Input terminal of measured current in case of UST.
Ground terminal of instrument, connected with the ground in a reliable
way when using.
2. Reference wiring
2.1 UST, internal reference capacitor, internal HV (conventional UST):
HV shell HV core
HV
Shell Shell
UST I-CN
Core 5-Hz I-UN
GND
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2.2 GST, internal reference capacitor, internal HV (conventional GST )
HV core
HV shell
HV shell
HV
GST I-CN
5-Hz I-UN
GND
2.3 UST, external reference capacitor, internal HV;
HV core
HV shell
HV
Shell
Core l Shell
UST E-CN
Core l5-Hz I-
UN GND
2.4 GST, external reference capacitor, internal HV;
HV shell
HV shell HV core
HV
GST E-CN
Shell
Core l5-Hz I-UN
GND
2.5 UST, internal reference capacitor, external HV:
HV core
HV shell
External HV (max 10kV)
HV
XC Shell Shell
UST I-CN
Core l
5-Hz E-
UN
GND
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2.6 GST, internal reference capacitor, external HV:
Core l
External HV (max 10kV)
HV shell Shell
HV XC
GST I-CN
5-Hz E-UN
GND
2.7 UST, external reference capacitor, external HV( HV dielectric loss)
Increase external HV as per Cx/C\n voltage level
HV
Shell
Core l
Shell
UST E-CN
GND
Core l
5-Hz E-
UN
2.8 GST, external reference capacitor, external HV:
HVshell
Core l
Shell
External HV (max
10kV)
HV
XC
GST E-CN
Shell
Core l
5-Hz E-
UN
GND
2.9 CVT self-exciting measurement
Wiring of CVT self-exciting measurement is as per the following diagram.
If C1is single-section capacitor, the bus should not be grounded. If C1is
multiple-section capacitor, it can be grounded. C11and C12 can adopt
conventional UST and GST measurements, but for C13 for C2, self-exciting
measurement is advisable.
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Bus
Core
HV cable
Cn
Bridge Core
GND
LV
When adopting CVT self-exciting measurement, the instrument should
measure C1firstly and then C2with the method of lead measurement and
correct impact of voltage division automatically. It should be noticed that the
HV cable should be hung in the air; otherwise additional dielectric loss to the
ground will cause errors. It is feasible to connect the HV socket and CVT with a
fine cable and suspends them. It is strongly recommended that black Cx
cable should be used to connect with the HV socket.
3. Additional function
3.1 When the cursor is at voltage: 10kV, press “OK” key and an icon
will appear on left bottom of instrument screen. It means that it will print
automatically after testing. Press the OK key again, the icon will disappear. It
means that it must be printed manually after testing.
3.2 When the cursor is at variable frequency. under the circumstance of
GST, I-CN and I-UN, press OK key and an icon will appear on right
bottom of instrument screen. It means that the reverse wiring low voltage shell
testing will begin. Press the OK key again the icon will disappear. It means that
GST low voltage shell is removed.
3.3 When the cursor is at GST, press OK key means testing the printer
and change paper.
3.4 When the cursor is at start, press DOWN key means taking out the
stored data.
3.5 After finishing test, press DOWN key means storing test data.
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VIII. Introduction to instrument functions
The instrument panel is as shown in Diagram 3:
Diagram 3
1. Cxsocket 2. Cnsocket 3. CVT1
4. CVT2 5. Power jack 6. Power switch
7. High voltage switch 8. Menu key 9. Printer
10. Display 11. Rear side Diagram
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IX. Operation steps of instrument
1. Preparation for measurement:
1) Connect one end of ground wire with ground pole of instrument and the
other end with reliable ground in order to ensure instrument casing is at the
ground potential.
2) UST: Insert the HV cable plug in the back door HV socket and fix the
big red clamp on the other end on the HV terminal lead. Suspend the small
black clamp or clamp it on the big red clamp. Insert the CXlow voltage cable
in the CXsocket. Fix the lower terminal of tested article by the red clamp on the
other end, suspend the black clamp or connect it with the shield.
3)GST: Insert the HV cable plug in the back door HV socket and fix the big
red clamp on the other end on the HV terminal lead. Suspend the small red
clamp or connect it with shied. Cx socket is needless.
2. Turn on power switch, the instrument will begin self-checking. If the
result comes to be good, LCD will display a Chinese menu as shown in
Diagram 4.
3. Menus option:
1) Move the cursor to each menu option by key, and indicate them in
cycle. The selected option will be displayed in reverse font. Procedure of
selecting key is as shown in Diagram 5.
2) For the items that the cursor points to, the menus can be changed by
keys and indicated in cycle. The procedure is as shown in Diagram 6.
3) After changing the menu to correspond to testing requirement, press
the selection key to select for the next item.
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UST I-CN
5-Hz 10kV I-UN
TEST
Diagram 4
Mode: UST
UST GST CVT
Frequency: 5-Hz
10 9 8 7 ……2 1
Voltage: 10kV
5-Hz 50Hz
Test
Internal External
Standard: Internal reference reference
reference
Power supply: Internal HV Internal External
HV HV
Diagram 5 Diagram 6
UST I-CN CX = 50.85PF
5-Hz 10kV I-UN
tgδ= 0.002%
Testing…………. 55%
Diagram 7 Diagram 8
4. Testing: Power on, and place the cursor on testing item. Press OK key
for about 5 seconds to start testing. It will show menus in testing process, as
shown in Diagram 7 (UST, 5-Hz). When testing progress is up to 100%, the
test is completed and it will display the test result as shown in Diagram 8. At
this moment, the cursor will point to the printer icon and press OK key to print
the report. The test result has the following meaning:
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tgδ: Loss factor of tested article tgδ value.
CX: Measured capacitance value
V: Applied voltage value
I: Current flowing through the tested article
F1, F2: Testing frequencies
After completing printing, turn off the power switch and the test comes to
an end.
X. Notes for site test
If the test data is obviously unreasonable when using it, it may be caused
by:
1. Poor contact of hook
Hook and tested article should keep in good contact when the hook is
used to connect tested article in site measurement, otherwise the contact point
may discharge and thus lead to wild data fluctuation. Too thick oxide coating of
drainage cable or cable movement caused by wind may lead to poor contact.
2. Poor ground connection
Poor ground connection may cause instrument protection or wild data
fluctuation. Scrape the paint and rust at ground point and guarantee against
any resistance grounding.
3. Direct measurement of CVT or measuring electromagnetic PT with the
method of end shell
Negative value phenomena of dielectric loss may occur when the next
section coupled capacitor of CVT is directly measured. So self-exciting method
will be preferred
In case that negative value of dielectric loss occurs as the result of “T-type
network interference” caused by damp when measuring electromagnetic PT
with the method of end shell, dry the triple petticoat insulator and wiring
terminal block under it. Alternatively, adopt conventional method or increasing
18

end voltage measurement method.
4. High air humidity
If the air humidity exceeds the standard and results in abnormal increase
(decrease or even negative value) of measurement result and its instability,
add a shell if necessary. However, adding shell by human factor may change
the electric-field distribution of tested article. So this method is debatable and
should be subject to the related regulations.
5. Power supply from generator
In case that the input frequency is unstable when generator works, adopt
50Hz mode.
6. Test cable
Since long term use may result in hidden disconnection of test cable, short
circuit of core and shield or poor contact of plug, user should maintain the test
cable periodically.
When testing the tested article with reference capacitance, the fully
shielded plug should be used to eliminate the impact of additional stray
capacitance. If not, the instrument accuracy cannot be realized.
When measuring CVT with self-exciting method, suspend the
non-dedicated HV cable, otherwise the additional stray capacitance and
dielectric loss to the ground may cause errors.
7. Operating mode selection
Select a correct operating mode for measurement after wiring (UST, GST
and CVT), any mistake is not allowed. Particularly select variable frequency
anti-interference mode under interference environment.
8. Impact of testing method
For the reason that dielectric loss measurement may vary from different
methods, it is important to distinguish test method error from instrument errors.
When faults appear, firstly check wiring and then determine whether the
instrument goes wrong.
9. Instrument fault
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Detect the disconnection status of test cable or short circuit of core and
shield with a multimeter; determine whether 220V input power is too high or
too low and whether grounding is in good contact.
Measure the reference capacitor or tested capacitor with known capacitor
and dielectric loss. If the result turns out to be correct, then it can be concluded
that the instrument has no problem.
Pull off all test cables to conduct voltage increase in an idle state. If the
instrument fails to work normally, it has gone wrong.
Measure low voltage output after starting CVT measurement, 2 ～
5Vvoltage should appear, otherwise the instrument has gone wrong.
XI. Instrument detection
1. Detect with reference loss tester
Connect the reference loss tester with a shielded cable with plug. If the
accuracy of loss tester is unwarranted, take a comparison method for detection.
It is suggested to take 2801 electric bridge or other precision electric bridge as
a referenced standard. Instrument should select “internal reference” and “RC
cascade tested article” and power frequency 50Hz or 50Hz with regard to
frequency mode.
2. Detect with QSJ3: Connect QSJ3 with shielded cable with plug, select
“UST/E-CN/E-UN measurement, current ratio is represented by Cx: Cn and
set an appropriate value for Cn.
3. Anti-interference capacity
Set a loop circuit and inject quantified interference current to the
instrument.
Note:
1) Please be noted that the loop circuit may be a part of tested article.
2) As the instrument starts, the 220V power supply circuit may produce a
measurement frequency component. If the frequency component enters into
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