Capacitor series reactors generally adopt epoxy glass fiber multi-encapsulated parallel structure, according to the characteristics of the device site, three-phase vertical stacking, three-phase horizontal "△" and three-phase horizontal "-" type distribution.
There have been many cases of cracking of the inner and outer insulation layers during the operation of the series reactor in the substation in the southern area, which has affected the safe operation in serious cases. Under the arrangement of wind control, the manufacturer and the operation management department carried out a specific analysis. Under the arrangement of network adjustment, the manufacturer and the operation management department carried out a specific analysis, after comparing different operating conditions and climatic reasons, it was found that because the capacitor bank is an additional load operation, the operating current is large, and the load current in normal operation reaches 1000A, under the effect of such a large current, the operating temperature of the series reactor is close to 100 °C, such as the rainstorm climate when exiting the operation, the surface temperature of the reactor decreases rapidly, and the change of thermal expansion and contraction in a short period of time is the main reason for the cracking of the appearance of the series reactor. Therefore, in the work requirements, the on-site personnel on duty are required to change the operation mode of the capacitor as little as possible when the climate changes abruptly.
There has been an accident of overheating and ignition of the series reactor in the system, and the cause analysis is that the same is due to the large operating load current of the capacitor bank, and the touch of the conductor joint is not tight, and the touch resistance is too large, resulting in overheating, and when the ignition point of the fiber village material is exceeded, incineration will occur.
The structural characteristics of the middle hollow of the series reactor determine that it is the resting place for the nesting ambition of various birds, and if a large number of hay and branches are not sorted out in time, it may cause the fire of the reactor or the ground short circuit.
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Calculation of the braking resistance of the inverter – Reynolds
After selecting the resistance value of the braking resistor, the power value of the braking resistor should be confirmed, and the selection of the braking resistor power is relatively cumbersome, and it is related to many factors.
The instantaneous power consumed by the braking resistor is calculated according to the following formula: P instantaneous = ...
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Inverter speed regulation method - Reynolds
1. Pole change logarithmic speed regulation method
This speed regulation method is to change the number of stator poles of the cage motor by changing the connection method of the stator winding, so as to reach the intention of speed regulation; The wiring is simple, the control is convenient, and the price is low; It can be used in conjunction with pressure and speed regulation, electromagnetic slip clutch to obtain high efficiency ...
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Characteristics and Discrimination of Resistance Damage - Reynolds
I often see many beginners tossing on the resistor when overhauling the circuit, and it is dismantling and welding, in fact, it is repaired a lot, as long as you understand the damage characteristics of the resistor, you don't have to bother.
Resistors are the most numerous in electrical equipment ...
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Reynolds EPS emergency power supply routine maintenance
1. EPS the first use of the emergency power supply, the battery pack should be charged continuously for 48 hours after discharging protection;
2. EPS emergency power supply to keep the whole machine dry, clean, free of dust and foreign objects, wipe with a soft cloth after shutting down, and strictly ...
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Frequency conversion cabinet external conduit wiring method - Reynolds
When it is required to wiring outside the frequency conversion cabinet, it is generally necessary to use the conduit for wiring, which requires suitable mechanical pressure and unsuitable mechanical damage, moisture-proof and corrosion-resistant. Conduits include the following two wiring methods:
1. Kim ...
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Protection feature of overcurrent trip - Renol
1. Maintenance objectives of overcurrent
In the frequency conversion speed regulation system, there are two devices: the frequency converter and the motor. The degree of tolerance to overcurrent is not the same. The planners of the production machinery decide on the capacity of the motor based on the principle of heat. That is, as long as the electricity ...
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Frequency converters need to be replaced regularly – Reynolds
The inverter is composed of many electronic parts, such as semiconductor components, etc., in the application and protection involves the replacement of a related component, because of the composition or physical characteristics of the inverter, it will deteriorate in a certain period of time, which will reduce the characteristics of the inverter, and even ...
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Reynolds universal inverter start-up mode
1. Direct launch
The universal inverter insists on starting at the beginning of the time according to the set starting frequency and starting frequency, and then accelerates to a given frequency according to the selected acceleration time
Second, the speed of the tracking start
Universal inverter ...
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The soft starter output is out of phase fault
Soft Starter Repair Problem: F 04 (Input Phase Loss):
There are several factors that cause this problem, some of which are listed below:
(1) Check whether the wiring between the incoming power supply and the motor is loose;
(2) Whether the output is connected to the load, and whether the load is matched with the motor;
(3) ...
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The cause of the heating of the inverter of the special machine
1. Problems of the inverter and the motor itself;
After the motor has been used for a long time, it cannot be ruled out that the insulation function is not good, or the bearing is stuck, and it may show a large current and heat. The coupling between the motor and the load may also be worn, or the motor is unbalanced in three phases, and the fixtures of the motor are loose.
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Use the right power for the inverter – Reynolds
Low pressure issues
The VFD reports a low voltage glitch when the drive's DC link voltage drops below 62% of the nominal level at the high setting (480 Vac) and 50% of the nominal value at the low setting (400 Vac).
The +10% and -15% voltage tolerances in most manuals are the ones that claim to be ...
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Precautions for low-temperature operation of VFD
1. VFD should be operated in an environment above minus 10°C as much as possible, and it is best to operate indoors.
2. When the VFD is started and stopped, try to start and stop with the VFD itself, do not close the power supply, and keep your VFD in a power-on state.
3. Give VFD l ...
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Reynolds drive safety rules and warnings
The high-voltage inverter has been designed with the safety of the user in mind. However, due to the energy storage capacitor installed inside the power unit of the inverter, it may still carry a high voltage after disconnecting the power supply, and some parts generate a lot of heat, so contact is prohibited. When working on or near the inverter, please ...
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The cause of damage to the inverter brake unit - Reynolds
The inverter motor is equipped with a mechanical brake, is the inverter motor in the power generation condition when parking? Is the brake unit of the inverter working at the moment? What are the causes of brake unit damage?
Answer: 1. The inverter motor is equipped with a mechanical brake, and when parking...
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Frequency converter soft troubleshooting – Reynolds
Undervoltage is also a problem that we often encounter in application. Mainly because the voltage of the main circuit is too low (220V series is lower than 200V, 380V series is lower than 400V), the main reason: a certain way of the rectifier bridge is damaged or there is abnormal operation in the three ways of the thyristor, which may lead to the appearance of undervoltage problems, ...
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Reynolds permanent magnet synchronous motor solutions
The permanent magnet synchronous motor has high-efficiency motor drive performance, which can complete high-speed, high-precision, high-stability, fast-responding, high-efficiency and energy-saving motion control. Reynolds drives provide a vector control technology solution for permanent magnet synchronous motors.
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The inverter protects the motor - Reynolds inverter
1. The output of the inverter for overvoltage maintenance has the function of voltage detection, and the inverter can actively adjust the output voltage, so that the motor does not bear the overvoltage, and the motor runs within the set voltage range.
2. Undervoltage maintenanceWhen the voltage of the motor is lower than 90% of the normal voltage (some are set to 85% ...
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Reynolds inverter code function description
F09 second acceleration time 0.10 - 999.9sec; 5.0sec； △ The first acceleration and deceleration parameters and the second acceleration and deceleration parameters are switched by terminal X3 (see F55);
F10 second deceleration time 0.10 - 999.9sec; 5.0sec； △ The first acceleration and deceleration parameters and the second acceleration and deceleration parameters ...
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The reason for the preferred DC mode in the intermediate link of the inverter - Reynolds
The development of the inverter has experienced a slow and gradual process, and the inverter at the beginning of the first century did not choose this kind of AC-DC: communication to DC and then to communication, but direct AC, no central DC link. This kind of inverter is called alternating frequency converter, and now this kind of inverter is in the ultra-high power ...
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Interpretation of Reynolds inverter models
Take the RNB2000 series inverter as an example.
The model number of the RNB2000 series 37kW inverter is: RNB2037-U
RN: on behalf of Reynolds;
B: low-voltage frequency conversion governor;
2: 2000 series;
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