SXJS-IV Intelligent Dielectric Loss Tester
Dari Electric recommends
Working Principle of SXJS-IV Intelligent Dielectric Loss Tester
The instrument's measurement circuit includes a standard circuit and a test circuit.
The standard circuit consists of a built-in high-voltage stable standard capacitor and a standard resistance network. The computer collects the current amplitude and phase difference of the standard circuit and the test circuit in real time, and calculates the capacitance (CX) and dielectric loss (tgδ) of the tested object.
The data acquisition circuit uses high-voltage stable devices entirely. The acquisition board and computer are completely floating and shielded by an iron box, and the instrument shell is grounded and shielded. Additionally, anti-interference technologies such as optical data transmission, floating ground, large-area ground, single-point ground, and digital filtering are used. Combined with the computer processing data from hundreds of power grid cycles, the measurement results are stable and reliable.
Usage Method
★★★ Safety Operation Precautions
1. When using, the instrument's grounding terminal must be reliably grounded.
2. Only when the instrument power is turned off and the test voltage selector switch is set to "Off" position, is it considered safe to contact the rear of the instrument and its measurement cables and the tested object.
3. During testing, it is strictly forbidden to operate the "Test Voltage" selector switch.
4. ★ In the normal connection method, the UH terminal is high voltage; in the reverse connection method, the IX terminal is high voltage. When using, you must keep sufficient distance between the high-voltage cable and the ground according to the actual situation. The special insulated cables provided by our company can be dragged on the ground when measuring large-capacity test objects.
5. Do not replace fuse tubes that do not match the panel indication values.
6. When using, try to use the cables provided by the manufacturer with the instrument to ensure measurement accuracy.
7. Operation Keyboard
Standby------Not used.
Quick Test-------Quick measurement, no anti-interference function.
Anti-interference-------Anti-interference measurement.
Normal Connection-------Normal connection method measurement.
Print-------After the test result is obtained, print the test data.
Reverse Connection-------Reverse connection method measurement.
Start-------Start high voltage, begin measurement.
External Connection-------External connection method measurement. Also used to select the capacity of the external standard capacitor.
Stop-------Can interrupt measurement during the test process.
Turn on the power, the instrument first performs self-check
(display, optical communication, memory, operation keys, digital-to-analog conversion, power grid frequency). After self-check passes, it enters the main menu. Then follow the screen prompts to complete the test.
After entering the measurement state, the user can exit the measurement state at any time by pressing the "Stop" key.
When performing normal and reverse connection measurements, no manual intervention is required. The connection method of the test leads matches the instrument operation measurement method. If using the normal connection wiring method, pressing the "Reverse Connection" key during the test can also produce results, but the results are not true and reliable.
When performing external connection measurement, the display will show "Please turn off external high voltage!" and pause, waiting for manual shutdown of the external high voltage. After turning off the external high voltage (must turn off external high voltage), press the "Start" key again to complete the test.
If the external high voltage is not turned off, the test results will not be true.
Selection of external standard capacitor capacity:
In "External Connection" mode, pressing the "External Connection" key once will change the displayed external standard capacitor capacity "XXXXpF". There are eight capacities to choose from (the last one is for factory debugging, and user use is invalid).
50pF,100pF,150pF,200pF,500pF,1000pf,XXXpF,XXXpF.
You should select the capacity equal to the external standard capacitor. If the external capacitor capacity is special, you can ask the manufacturer to input the capacitor capacity into the instrument. If the selected external capacitor does not match the actual one, the measurement results will be affected.
Before powering on, first set the "Test Voltage" switch to the "Off" position. Connect the UH terminal with the large iron clamp (marked UH) of the special cable to the high-voltage end of the tested object, and connect the IX terminal with the core wire end (red, marked CX) of another special cable to the low-voltage end of the tested object CX. Its shielded wire end (black, marked E) is grounded. If the low-voltage end of the test object has a shielding terminal, you can connect that terminal to "E" with a wire and then ground it.
After powering on, press the "Normal Connection" key. Select the normal connection method: use the "Test Voltage" switch to select the voltage, then press the "Start" key to begin the test.
Reverse Connection Method)
Before powering on, first set the "Test Voltage" switch to the "Off" position, ground the UH terminal, and connect the IX core wire (marked CX) to the high-voltage end of the tested object CX.
After powering on, press the "Reverse Connection" key, select the reverse connection method: use the "Test Voltage" switch to select the voltage, then press the "Start" key to begin the test.
Special note: The shield "E" is close to the IX potential. It can be connected to the shield of the high-voltage end of the tested object or left floating. It must not be grounded! Otherwise, the output terminals of the internal high-voltage transformer will short-circuit.
CB is the external standard capacitor, CX is the tested object.
When the test voltage required for the tested object is greater than 10KV or the capacity of the test object is greater than 60000pF, you can use an external high voltage for measurement, that is, do not use the internal high-voltage generator, but connect an external high-voltage device for measurement.
Note: When using external high voltage for measurement, set the "Test Voltage" switch to the "Off" position! Adjust the external voltage, then press the "Start" key to begin the test.
After powering on, press the "External Connection" key multiple times to select the external connection method and the capacity of the external standard capacitor. You must also set the "Test Voltage" switch to the "Off" position! Adjust the external voltage, then press the "Start" key to begin the test.
This instrument has a Chinese LCD display with Chinese character prompts for various test information. After the test is completed, you can press the "Print" key to print the test results.
Overview
This instrument is an advanced device for measuring dielectric loss (tgδ) and capacitance (Cx). It is used under power frequency high voltage to measure the dielectric loss (tgδ) and capacitance (Cx) of various high-voltage equipment such as insulating materials, insulating bushings, power cables, capacitors, transformers, and more.
It replaces the QSI high-voltage bridge. It has the advantages of simple operation, Chinese display, printing, convenient use, no conversion needed, built-in high voltage, strong anti-interference capability, and short test time. It is our factory's third-generation intelligent dielectric loss tester.
Note: The above information and technical parameters are compiled and released by Yangzhou Dari Electric Co., Ltd.
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