Leakage vacuum circuit breaker connection: When normal operation, regardless of whether the three-phase load is balanced or not, the sum of the three-phase current phasor through the main circuit of the zero-sequence current transformer is equal to zero, so there is no induced electromotive force in the secondary winding, and the leakage maintainer operates in a closed state. In the event of a leakage or electric shock, the sum of the three-phase currents is no longer equal to zero, but equal to a certain current value Is. IS will form a loop through the human body, the earth and the neutral point of the transformer, so that the induced electromotive force corresponding to Is will be generated on the secondary side of the zero-sequence current transformer, which will be added to the tripper, and when IS reaches a certain value, the tripper will act, push the lock of the main switch, and break the main circuit.
Precautions related to leakage vacuum circuit breaker circuit:
1. Leakage vacuum circuit breakers are generally divided into two poles, three poles, and four poles, which are used in different lines. Only the correct selection and application of talents can achieve the desired effect;
2. The rated voltage and current of the vacuum circuit breaker should be greater than or equal to the normal operating voltage and current of the line equipment;
3. The leakage current that should be maintained by the line should be less than or equal to the regular leakage maintenance current of the vacuum circuit breaker;
4. The ultimate on-off capacity of the vacuum circuit breaker should be greater than or equal to the maximum short-circuit current of the circuit;
5. The rated current of the overload tripper is greater than or equal to the maximum load current of the line;
6. It has a short breaking reaction time, which can play a role in maintaining the line and equipment;
7. After the vacuum circuit breaker circuit is connected, check whether the wiring is correct. This can be viewed via the Experiment button. If the circuit breaker can be broken correctly, it is clarified that the leakage maintainer device is correct, otherwise the line should be checked and the fault should be eliminated. After the leakage maintainer is put into operation, the user should check whether the circuit breaker is operating properly via the experiment button every time it passes.
|
More on that
|
The structure of Delixi small contactor
Delixi's communication contactor is widely used in industrial electrical, contactor as a kind of electromagnetic switch, its interior is mainly composed of the main and auxiliary contacts and electromagnetic coils, static cores and other parts of the control line connection and breaking.
...
|
|
The treatment method of leakage protector often tripping - Delixi
1. Trial delivery and commissioning method
The first thing to find is the fault of the remaining current action maintainer itself. The detailed operation method is: first block the power supply, and then remove all the zero-sequence transformer load side leads of the remaining current action maintainer (the second and third level remaining current action maintainers will directly remove the outgoing ...
|
|
Delixi Electric universal switching power supply
Delixi general switching power supply can provide stable DC output products, widely used in communications, LED displays, industrial control, radio and television, computer networks, medical equipment, intelligent monitoring and other fields.
Delixi universal switching power supply SA, DA, TA, QA Type 85 - 132 / ...
|
|
Delixi three-phase circuit breaker classification
Delixi's three-phase circuit breaker is generally divided into three types, namely 3P, 3P+N and 4P.
(1) Differences:
3P: Only three wirings are used for pure three-phase electrical equipment, which trips when there is no single-phase load to the ground or when there is a short circuit between phases; Otherwise, when a one-phase N-line load occurs, the N-line is disconnected ...
|
|
Analysis of the quality of Delixi surge protector
Look at the quality of the surge protector, to see whether it can complete his basic specification, relative to the surge protector of the primary specification is whether the surge operating voltage can be constrained below the required value, the surge protector must discharge the lightning current when the mission is completed, this specification must be completely completed.
|
|
The structure of the inverter - Delixi
The main circuit is the power conversion part that supplies the voltage regulation and frequency modulation power supply to the asynchronous motor, and the main circuit of the inverter can be roughly divided into two categories: the voltage type is the inverter that converts the DC of the voltage source into a communication inverter, and the filter of the DC loop is the capacitor. The current type is to convert the DC of the current source into a communication ...
|
|
Delixi air switch is connected to the reverse hazard
If the zero line of Delixi's air switch is reversed to the front, there is not much obstacle to the 2P circuit breaker and 2P leakage circuit breaker. The only effect is that it looks irregular, and you need to find the zero line from scratch when repairing, which brings a little inconvenience.
...
|
|
Delixi inverter harmonic control method principle analysis
1. Install AC reactor and DC reactor. When the inverter is used in the distribution transformer capacity is greater than 500kva, and the transformer capacity is greater than 10 times of the inverter capacity, an AC reactor is installed on the input side of the inverter. And when the output voltage of the distribution transformer is unbalanced and uneven in three phases ...
|
|
The impact of inverter cable design on the life of the motor and cable - Delixi
Reflected waves caused by a cable-motor impedance mismatch are prevalent in all AC VFD uses. The severity of the problem depends on the length of the cable, the rise time of the PWM (Pulse Width Modulation) carrier, the voltage of the VFD, and the magnitude of the impedance difference between the motor and the cable.
...
|
|
Delixi time control switch adjustment method
Press the undo function key first, then press and hold the school time function key, then adjust the time and date to the current moment, press the punctual function key again, adjust the time that needs to be closed and open to the specified value, if you need to set multiple groups, then press the punctual function key to set, without multiple groups ...
|
|
Delixi launched a new 6 series CDW6i frame circuit breaker
At the end of July, Delixi Electric launched a new 6 series CDW6i structural circuit breaker and a number of industrial control accessories.
The new 6 series CDW6i structural circuit breaker has complete product specifications, which can provide professional customers with more choices, excellent functions, and ...
|
|
Delixi relay maintenance method
Relay is a kind of electrical appliance that turns on or off the control circuit according to the change of external input signals, such as electrical quantity (voltage, current) or non-electrical quantity (heat, time, speed, etc.), in order to complete the control or maintenance mission.
|
|
General parameter setting skills of inverter - Delixi
The setting menu of the inverter is divided into a first-level menu, a second-level menu, etc., and the menu is followed by parameters.
If the inverter starts in standby (ready to run) condition, set the FUn-PSS-SP2 parameter to 15Hz, and then return to the standby state operation.
In the practice setting ...
|
|
Delixi small contactor structure introduction
Delixi's communication contactor is widely used in industrial electrical, contactor as a kind of electromagnetic switch, its interior is mainly composed of the main and auxiliary contacts and electromagnetic coils, static cores and other parts of the control line connection and breaking.
...
|
|
Hu Chengzhong, director of Delixi, suggested five major suggestions to optimize science and technology to benefit people's livelihood
Founded in 1984, Delixi Group started with thermal relays, 36 years of big waves, has been in the first camp of China's electrical industry for many years, and has been ranked among the top 500 Chinese enterprises for 18 consecutive years. In recent years, under the guidance of the strategy of "manufacturing power", Delixi has focused on the main line of high-end manufacturing, and has taken multiple measures to ...
|
|
The inverter is changed to a servo to consider the key points
There are substantial differences between servos and inverters in terms of application intention and function. Which one to choose depends on factors such as operating mode, load conditions, price, etc. Basically, the performance of the servo is superior to that of the inverter. Therefore, when changing from an inverter to a servo, there are generally no operational problems ...
|
|
The difference between the poles of Delixi circuit breaker
Circuit breakers account for a very large proportion of electrical sales and have a wide range of applications, but there are different standards for circuit breakers. For example, 1P, 1P+N, 2P, etc., there are also differences between them.
1. 1P circuit breaker, it is a single-stage ...
|
|
Delixi air switch object, structure, principle
Application of air switches (circuit breakers).
Delixi air switch, also known as circuit breaker. It is a switch that actively closes as soon as the current in the circuit exceeds the additional current. Air switch is a very important electrical appliance in the low-voltage distribution network and electric traction system.
|
|
The principle of circuit breaker jumping, closing and holding circuit - Delixi
During opening and closing operations, the remote opening and closing command is usually a high-level pulse of several hundred milliseconds. In order to prevent the pulse from becoming invalid before the end of the opening and closing operation, and to ensure that the opening and closing operation is completed, a holding circuit is added. Intuitively, it is to avoid tripping and closing, and the exit contact precedes the DL ...
|
|
Precautions for instrument maintenance - Delixi
1. When using a multimeter ohm, remember not to measure with electricity.
2. When using the logic pen and oscilloscope to detect the signal, it is necessary to pay attention not to make the probe contact the two measurement pins together, because the essence of this situation is to constitute a short circuit in the case of power-on.
3. Detect filtering in the power supply ...
|
|
Contact
working hours
