Shijiazhuang Jinzhou Jihang Electric Power Technology Co

Overview Discharge rods are also called telescopic high-voltage discharge rods, high-voltage discharge rods, etc. The high-voltage discharge rod is made of new insulating materials. It has the characteristics of being able to stretch and shrink. The portable retractable high-voltage discharge rod is easy to use in various outdoor high-voltage tests. Especially after the DC withstand voltage test, the charge accumulated on the test sample is discharged to the ground to ensure personal safety. The telescopic high-voltage discharge rod is easy to carry, convenient, flexible, small in size, light in weight and safe.
Main technical parameters: discharge rod shrinkage length, outer diameter.
The discharge rod shrinks by several sections.
, discharge rod extension size and length.
, discharge voltage range ~.
Instructions for use
Pull out all the telescopic parts of the portable telescopic high-voltage discharge rod.
Insert the prepared ground wire plug into the jack at the head end of the discharge rod, and connect the other end of the ground wire to the earth. The grounding must be reliable.
When discharging, the test should be completed, that is, the boost knob of the DC generator control box returns to the zero position. At this time, it can be observed that the voltage of the voltmeter on the DC high-voltage generator control box drops to about ~ , can be discharged.
When discharging, you should first use the metal tip at the front end of the discharge rod to slowly approach the test sample that has been disconnected from the test power supply. At this time, the electric energy released by the discharge rod is discharged to the ground through a discharge resistor. Then use the hook on the ground wire on the discharge rod to hook the test sample and conduct a second direct discharge to the ground.
Notes
When discharging a large capacitance test sample, you must wait for a period of time after the test is completed and disconnect the test power supply to allow the charge on the test sample to pass through the voltage multiplier and the test sample. It self-discharges to the ground. At this time, you can observe that the voltage of the voltmeter on the control box is gradually decreasing. When the voltage of the voltmeter drops to a lower voltage, usually around ~, the discharge rod can be used to gradually move to the vicinity of the test sample. First, discharge through the air in the gap. At this time, a hissing sound can be heard. When there is no sound, touch the test object with the tip of the discharge rod, and finally connect the test object directly to the ground for discharge.
The accumulated charge of a large-capacitance sample is directly proportional to the capacitance of the sample and the level of the applied voltage and the length of time.
After the test of high-voltage cables of more than several kilometers, the discharge time is generally very long, and the discharge needs to be repeated many times. The resistor capacity needs to be large, and a large-capacity discharge rod needs to be ordered.
It is strictly prohibited to use a discharge rod to discharge the test sample without turning on the test power supply.
It is strictly forbidden to squeeze the discharge rod with feet or heavy objects, and it is strictly forbidden to bend or break the discharge rod.
. It is strictly forbidden to let the discharge rod get damp, which will affect the insulation strength. It should be placed in a dry place.
Complete set of products
Portable retractable discharge rod
Self-equipped ground wire
Copy of instruction manual
Product certificate
How to choose the editing accuracy grade and Function
The functions of general-purpose models on the market vary widely. Some have high precision and many functions, while others have low precision and simple functions. The basic error of an instrument with high precision is (~ and that of an instrument with low precision is (~). The price difference between the two is ~ times. Therefore, situations where the measurement accuracy is not very high (such as non-commercial calculations only for control purposes, only high reliability and It is not economically worthwhile to use high-precision instruments in situations with excellent repeatability.
Some models of instruments claim to have higher accuracy, with a basic error of only (~ but there are strict installation requirements and reference conditions, such as The ambient temperature is ~℃, and the length of the front and rear straight pipe sections is required to be greater than and (usually for He and He). It is even proposed that the flow sensor should be integrated with the front and rear straight pipes, and real flow calibration should be performed on the flow standard installation to reduce the impact of clamping. Therefore, in many models When choosing to compare, don’t just look at the high indicators, but read the manufacturer’s samples or instructions in detail to make a comprehensive analysis.
The functions on the market are also very different. A simple one only measures one-way flow and only outputs simulated signals. The multi-function instrument driven by the signal has two-way flow measurement, range switching, upper and lower limit flow alarms, empty pipe and power cutoff alarms, small signal cutoff, flow digital display and total calculation, automatic check and error detection Diagnosis, communication with the host computer and activity configuration, etc. The serial digital communication function of some models of instruments can choose a variety of communication interfaces and special chips to connect protocol systems,,,, field buses, etc.
Conductivity< br/> The prerequisite for use is that the liquid to be measured must be conductive and cannot be lower than the threshold (i.e. the lower limit). If the conductivity is lower than the threshold, measurement errors will occur or even cannot be used. If the conductivity exceeds the threshold, it can be measured even if it changes. , showing that the price error of thermocouples in Jiangsu has not changed much, and the threshold value of the universal type is between, which varies depending on the model. The use also depends on the length of the flow signal line between the sensor and the converter and its distribution capacitance, which is used by the manufacturer The instruction manual generally specifies the length of the signal line corresponding to the conductivity. Non-contact capacitively coupled large-area electrode instruments can measure liquids with conductivity as low as //- The conductivity of industrial water and its aqueous solutions is greater than /, the conductivity of acid, alkali, and salt liquid is between /, there is no problem in use, and there is no problem in low-strength distilled water /. Petroleum products and organic solvents cannot be used if their conductivity is too low. The table lists some liquids The conductivity of some pure liquids or aqueous solutions is found to be low from the materials and is considered unusable. However, in actual work, it may be possible to use it because it contains impurities. Such impurities increase the conductivity. About For aqueous solutions, the conductivity in materials is measured in the laboratory using pure water proportions. The actual aqueous solution can be proportioned with industrial water. The conductivity will be higher than that measured, which is also conducive to flow measurement.
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