HVTest HTJS-V Manual de usuario

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

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

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.

－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. 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

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.

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.

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

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.

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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