The role of the high-voltage test transformer in the power system is to convert the voltage to facilitate the transmission of power. After the voltage is boosted by the boosted high voltage test transformer, the loss of the transmission line can be reduced. Improve the economics of power transmission and achieve long-distance power transmission. The buck high voltage test transformer can turn the high voltage into the user's required voltage at all levels to meet the needs of the user.
Judging the fault from the abnormal sound of the high-voltage test transformer:
"Hush" sound. After tapping and regulating the pressure, the noise increased, and the DC resistance of the two-axle bridge tested exceeded 2% of the original data of the factory, which was due to poor contact and dirt caused by contact.
Treatment method: Unscrew the weatherproof cover of the tap-changer, remove the locking screw, and rotate the shaft of the tap-changer about 10 to 15 times with the reversing hand, then this phenomenon can be eliminated and the assembly will be restored immediately after repair. Secondly, the terminal rod leads to the drop-down lead-off wire using bare aluminum or bare copper stranded wire, high-voltage insulation mats, but the tension is not enough, coupled with the relaxation of the porcelain cable tie. A small spark can be heard at dusk and dawn, which is distinct from the “click†sound produced inside the high-voltage test transformer. Treatment method: Use holidays to arrange power outages and troubleshooting.
The "cricket" sounds crisply. This is the lead of the high-voltage porcelain bushing, and the sound of discharge through the air to the transformer shell of the high-voltage test is due to the lack of oil in the upper part of the transformer tank.
Treatment method: Use a clean and dry funnel to insert the oil pillow from the oil injector hole, add the qualified high voltage test transformer oil of the same test (cannot be mixed with oil), and the oil amount is added to the oil surface line temperature of +20°C. Then put on the oiler. Otherwise, the oil will cause oil spills due to thermal expansion. If conditions permit, high-pressure insulation pad should be vacuum injection method to eliminate air bubbles in the coil. For high-voltage test transformers that do not use desiccant, check whether the vent hole in the oil injector is unblocked to ensure safe operation.
Dreary sound. This is the discharge of the high-voltage lead through the high-voltage test transformer oil to the enclosure, which is not enough to the ground (<30mm) or the insulating oil contains moisture.
The method of flooding: another three 380V leads from the three-phase three-wire switch are connected to the high voltage winding A, B, and C terminals of the high voltage test transformer in order to generate zero-load current, which not only flows through the high voltage coil. A copper loss is generated, and a magnetic flux is also generated. The magnetic flux passes through the coil stem, the iron core, the upper and lower yokes, the bolts, and the fuel tank also produces an iron loss. The heat energy generated by the copper loss and the iron loss makes the high-voltage test transformer oil, coil, and iron. The moisture of the parts is uniformly heated and evaporates, and is discharged through the hole of the oil-filler. A zero-load voltage of 25V is induced in the low-voltage coil, which acts as a power source for generating eddy currents in the tank. From the low-voltage winding a, b, and c terminals of the distribution high-voltage test transformer, three 10 to 16 mm2 aluminum core wires are connected to the high-voltage insulation mat, and are connected to the power distribution after being wound three times on the oil tank housing, middle, and bottom, respectively. The high-voltage test transformer low-voltage winding zero terminal, the generated eddy current heat energy can make the distribution of high voltage test transformer tank is heated evenly, and further improve the distribution of high-voltage test transformer drying quality. Note that if the baking temperature is higher than the rated temperature of the distribution high-voltage test transformer, the temperature at the time of drying can be reduced after removing the B-phase power supply.
The sound of a small gasket such as a magnet sucks a small crack on the magnet, and the indication values ​​of the monitoring device, voltmeter, ammeter, and thermometer of the high voltage test transformer are normal. This is often due to negligence during the new assembly or overhaul of the core, and no screws or iron pads are tightened or dropped into the small iron parts due to the electromagnetic force.
Judging the fault from the abnormal sound of the high-voltage test transformer:
"Hush" sound. After tapping and regulating the pressure, the noise increased, and the DC resistance of the two-axle bridge tested exceeded 2% of the original data of the factory, which was due to poor contact and dirt caused by contact.
Treatment method: Unscrew the weatherproof cover of the tap-changer, remove the locking screw, and rotate the shaft of the tap-changer about 10 to 15 times with the reversing hand, then this phenomenon can be eliminated and the assembly will be restored immediately after repair. Secondly, the terminal rod leads to the drop-down lead-off wire using bare aluminum or bare copper stranded wire, high-voltage insulation mats, but the tension is not enough, coupled with the relaxation of the porcelain cable tie. A small spark can be heard at dusk and dawn, which is distinct from the “click†sound produced inside the high-voltage test transformer. Treatment method: Use holidays to arrange power outages and troubleshooting.
The "cricket" sounds crisply. This is the lead of the high-voltage porcelain bushing, and the sound of discharge through the air to the transformer shell of the high-voltage test is due to the lack of oil in the upper part of the transformer tank.
Treatment method: Use a clean and dry funnel to insert the oil pillow from the oil injector hole, add the qualified high voltage test transformer oil of the same test (cannot be mixed with oil), and the oil amount is added to the oil surface line temperature of +20°C. Then put on the oiler. Otherwise, the oil will cause oil spills due to thermal expansion. If conditions permit, high-pressure insulation pad should be vacuum injection method to eliminate air bubbles in the coil. For high-voltage test transformers that do not use desiccant, check whether the vent hole in the oil injector is unblocked to ensure safe operation.
Dreary sound. This is the discharge of the high-voltage lead through the high-voltage test transformer oil to the enclosure, which is not enough to the ground (<30mm) or the insulating oil contains moisture.
The method of flooding: another three 380V leads from the three-phase three-wire switch are connected to the high voltage winding A, B, and C terminals of the high voltage test transformer in order to generate zero-load current, which not only flows through the high voltage coil. A copper loss is generated, and a magnetic flux is also generated. The magnetic flux passes through the coil stem, the iron core, the upper and lower yokes, the bolts, and the fuel tank also produces an iron loss. The heat energy generated by the copper loss and the iron loss makes the high-voltage test transformer oil, coil, and iron. The moisture of the parts is uniformly heated and evaporates, and is discharged through the hole of the oil-filler. A zero-load voltage of 25V is induced in the low-voltage coil, which acts as a power source for generating eddy currents in the tank. From the low-voltage winding a, b, and c terminals of the distribution high-voltage test transformer, three 10 to 16 mm2 aluminum core wires are connected to the high-voltage insulation mat, and are connected to the power distribution after being wound three times on the oil tank housing, middle, and bottom, respectively. The high-voltage test transformer low-voltage winding zero terminal, the generated eddy current heat energy can make the distribution of high voltage test transformer tank is heated evenly, and further improve the distribution of high-voltage test transformer drying quality. Note that if the baking temperature is higher than the rated temperature of the distribution high-voltage test transformer, the temperature at the time of drying can be reduced after removing the B-phase power supply.
The sound of a small gasket such as a magnet sucks a small crack on the magnet, and the indication values ​​of the monitoring device, voltmeter, ammeter, and thermometer of the high voltage test transformer are normal. This is often due to negligence during the new assembly or overhaul of the core, and no screws or iron pads are tightened or dropped into the small iron parts due to the electromagnetic force.
hydraulic block valve 100L/min
Max. Flow: 100L/min
Pressure: 310Bar
GKV100 series
GKV100 proportional valve is a stackable valve with interchangeable control styles.
Electro-Hydraulic pilot valves can be either 12 VDC or 24 VDC,corresponding current is 0-1.5 or 0-0.75Amp.
This series can provide following functions:
- Inlet module with pilot supply.
- Inlet module without pilot supply.
- A/B Port with overload valve on main section
- A Port with overload valve on main section
- B Port with overload valve on main section
- A/B Port with P.O. check
- A Port with P.O. check
- B Port with P.O. check
- End Cap with oil return function
- End Cap without oil return function
We can also choose other cartridges according to your requirement.
Valve Block,Standard Valve Block,Alloy Valve Block,Hydraulic Valve Block
Hangzhou Hanray Industry Co., Ltd , https://www.aircompressor.pl