HVTest HTJS-V Bedienungsanleitung
1
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: 86-27- 87452243
After Service Hotline: 86-27- 87459656
Fax: 86-27- 87803129
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.
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.
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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.
7
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.
10
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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