1. Incoming line maintenance
Incoming maintenance is the maintenance of the user's inlet end and inverter, including lightning protection maintenance, grounding maintenance, phase loss maintenance, inverted phase maintenance, unbalance maintenance, overvoltage maintenance, transformer maintenance and so on. These maintenance equipment are generally installed at the input end of the inverter, and before the inverter is operated, it must be ensured that there is no problem with the maintenance of the incoming line before it can be operated.
2. Lightning protection maintenance
It is a lightning arrester that can release lightning or release the overvoltage energy of the power system operation, maintain the electrical equipment from instantaneous overvoltage damage, and can cut off the intermittent flow without causing a short circuit in the grounding of the system. The arrester is connected between the incoming line of the inverter and the ground, and is connected in parallel with the inverter to be maintained. When the overvoltage value reaches the regular operating voltage, the arrester acts immediately, flows through the charge, limits the overvoltage amplitude, and maintains the equipment insulation; After the voltage value is normal, the arrester quickly returns to its original state to ensure the normal operation of the system and avoid damage due to lightning strikes.
3. Grounding maintenance
The principle of zero-sequence current maintenance is that according to Kirchhoff's current law, the algebraic sum of the complex currents flowing into any node in the circuit is equal to zero. In the case of normal lines and electrical equipment, the vector sum of the currents of each phase is equal to zero, therefore, the secondary winding of the zero-sequence current transformer has no signal output, and the fulfillment element does not operate. When a certain phase grounding problem occurs when the vector sum of each phase current is not zero, the fault current makes the magnetic flux in the annular core of the zero sequence current transformer, and the secondary side induced voltage of the zero sequence current transformer is reflected to the main monitoring box, and then the maintenance command is issued to achieve the purpose of grounding fault maintenance.
4. Overvoltage maintenance
Lack of phase, reversed-phase, unbalance maintenance, overvoltage maintenance. Lack of phase, reversed-phase, unbalanced maintenance, overvoltage maintenance is mainly collected by the incoming voltage response version of the inverter or the voltage transformer, and then the CPU board is calculated to determine whether it is a lack of phase, inverted, whether the incoming voltage is balanced, whether it is overvoltage, because if the input is out of phase, or inverted, and the voltage is unbalanced, or the overvoltage is very simple to form transformer incineration, or the power unit is damaged, or the motor rotates.
5. Transformer maintenance
As long as the Ipower series high-voltage inverter is composed of three parts: transformer cabinet, power unit cabinet and control cabinet, the transformer is a split dry-type transformer to convert the high-voltage alternating current into a series of low voltage from different points of view to supply power to the power unit, the transformer can only be cooled by air cooling, so the maintenance of the transformer is mainly maintained through the temperature of the transformer, so as to avoid the temperature of the transformer being too high and the transformer coil burning. Place the temperature probe in the three-phase coil of the transformer, connect the order end of the temperature probe to the temperature control equipment, the temperature control device can automatically start the temperature, alarm temperature, and trip temperature of the fan at the bottom of the transformer, and display the temperature of each phase coil at the same time, if the temperature reaches the alarm or trip value, the thermostat will send the signal to the PLC, and the alarm information will be displayed in the user interface, and the PLC will carry out alarm or trip maintenance.
6. Outgoing side maintenance
The outgoing maintenance of Ipower series high-voltage inverter is the maintenance of the output side part and load of the inverter, including output overvoltage maintenance, output overcurrent maintenance, output short-circuit maintenance, motor over-temperature maintenance, etc.
7. Output overvoltage
The output overvoltage maintenance is to collect the output voltage through the output side voltage sampling board, and if the output voltage is too high, the system will automatically alarm.
8. Output overcurrent
Output overcurrent maintenance is to detect the output current collected by Hall of the output output and compare it to determine whether an overcurrent has formed.
9. Output short circuit
Maintenance measures for short circuits between the stator windings of motors and their lead wires. If the inverter detects a short circuit in the output, it immediately closes the power unit and stops the operation.
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