Insulation Test Device for Live-Line Protective Equipment
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According to the methods required by the new State Power Grid (2002) No. 777 "Regulations for Preventive Testing of Electric Power Safety Tools and Equipment", it can quickly and more scientifically and reasonably complete the power frequency withstand voltage test for common auxiliary insulation tools such as insulating gloves, insulating boots, and insulating rubber pads.
Auxiliary insulation safety tools and equipment refer to those whose insulation strength is not to withstand the working voltage of equipment or lines, but only to strengthen the protective effect of basic insulation safety tools and equipment, to prevent contact voltage, step voltage, and leakage current arc from harming operators. They cannot be used to directly contact the live parts of high-voltage equipment. Safety tools and equipment belonging to this category include:
insulating gloves, insulating boots, insulating rubber pads, etc.
This instrument is mainly used for power frequency withstand voltage testing of safety tools and equipment such as insulating gloves and insulating boots, in order to determine whether these tools meet the conditions of use and ensure the personal safety of workers.
1.2 Test Basis
"Regulations for Preventive Testing of Electric Power Safety Tools and Equipment" issued by the State Power Corporation and implemented on November 7, 2002.
II.
ST2808 Main Functional Features
2.1 According to the new industry standard requirements, leakage current is taken as the test basis, which is more scientific.
2.2 According to the new industry standard requirements, insulating boots must use special electrodes without filling with water. Insulating boots that pass the test can be put into use immediately, and the service life of insulating boots is improved.
2.3 Combined structure, movable, transportable, and easy to prepare.
2.4 It can complete the withstand voltage test of 3 pairs (6 pieces) of insulating boots or gloves at one time, and accurately detect 6 channels of leakage current simultaneously.
2.5 Automatic timing.
III.
ST2808 Main Technical Indicators
Special electrode: ф3mm steel balls
Test voltage: AC 0—50Kv DC 0-60KV
Test current: 0—60mA
Current measurement accuracy: 0.2 class
Voltage measurement accuracy: 0.2 class
Maximum test quantity: 3 pairs/6 pieces, 6-channel current detection
Power supply: AC220V ±10%
IV.
ST2808 Usage Method
It consists of two main parts: the test host and the test bench. After unpacking the two parts, fix the test bench, and connect the grounding wires of the host and the discharge rod. Connect the control lines between the host and the high-voltage box.
During the test, fill the test object with steel balls (about 1.5-2.0 kg of metal balls for each insulating boot), then adjust the electrode rod through the locking screw so that the electrode is inserted into the insulating boot (glove) to the same position as the steel ball surface.
After the above work is completed,
Power frequency withstand voltage test:
Start test → Install the test object → Turn on the high-voltage box power → Turn on the host power → Press Settings → Enter the settings screen, set the test voltage, leakage current, and test time. Then enter the test screen, press High Voltage On, turn on the automatic state, press Start, and perform the test. After completion, the voltage is automatically reduced.
DC withstand voltage test:
Start test → Remove the transformer short-circuit rod → Connect the capacitor high-voltage silicone rubber wire to the electrode → Install the test object → Turn on the high-voltage box power → Turn on the host power → Press Settings → Enter the settings screen, select DC test, set the test voltage, leakage current, and test time. Then enter the test screen, press High Voltage On, turn on the automatic state, press Start, and perform the test. After completion, the voltage is automatically reduced, the test ends → Turn off high voltage → Turn off the host power → Turn off the high-voltage box power, then use the discharge rod to fully discharge the electrode, hang the grounding wire, remove the high-voltage silicone rubber wire and ground it, and finally remove the test object.
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Note: The high-voltage switch can only be closed when the voltage regulator is at zero point. If there is no response after pressing the high-voltage switch, press and hold the voltage reduction switch on the test screen until the voltage regulator returns to zero, then press High Voltage On again. At this time, you will hear the "beep" sound of the relay engaging. If the equipment is not used for a long time, the electric voltage regulator should be moved away from the zero position to prevent the zero-position switch spring from losing elasticity due to prolonged stress.
V. Maintenance
After using the device, ensure the test bench is clean.
If not used for a long time, keep the inside and outside of the accessories dry, and the electrode rod and insulating rod free of moisture.
Before use, measure the insulation resistance of the insulating rod, and if necessary, use high voltage to test that its withstand voltage value is not less than 50KV.
VI. Special Test Box
The special test box is mainly used for testing insulating boots and insulating gloves. It is designed according to the new safety regulations. It not only adopts a new lightweight combined structure, but also uses the special electrodes required by the new safety regulations. At the same time, it scientifically uses the leakage current of each test object as the scientific basis for judgment, which is the innovation of the traditional test method according to the new safety regulations.
Each set of the special test box is equipped with 6 insulating boot test boxes and 6 insulating glove test boxes.
Note: The above information and technical parameters are compiled and released by Yangzhou Dali Electric Co., Ltd.
