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 circuit breaker acts as a leakage current;
3PN: After the four-wire l1l2l3n passes through the transformer coil, it can use three-phase electricity or single-phase electricity. Regardless of whether the three-phase load is balanced or not, the leakage switch will not operate; Only when there is leakage, i.e. single-phase grounding or phase-to-phase short circuit;
4P: The four-wire L12L3 passes through the transformer coil in the same way as the 3PN, except that the 4P disconnects the N wire, and the 3P retains the N wire.
(2) Type
Four-pole circuit breakers are divided into four types: A, B, C, and D:
Answer: The n-pole is not equipped with an over-current tripper, and the n-pole is always connected together and is not closed or disconnected from the other three poles.
b: There is no overcurrent tripper at the N pole, and the N pole is connected to the other 3 poles.
The C: N pole is equipped with an overcurrent tripper, and the N pole is connected to the other 3 poles.
d: The N pole is equipped with an overcurrent tripper, and the N pole is always on, and is not closed or disconnected from the other three poles.
(3) Application:
In the case of using four poles, it is necessary to indicate which product to choose, because it is the same four poles, but whether an overcurrent releaser is installed on the N line, the function and use are different.
The overcurrent tripper is installed on the N line, which can be used for three-phase four-wire distribution lines dominated by single-phase loads, and can also be used for nonlinear loads that generate a large number of harmonics, such as gas discharge lamps, thyristor dimming, speed regulation lines and other occasions with special requirements. Generally, an N-wire circuit breaker without overcurrent tripper can be used for the equipment circuit.
In fact, although A and D are called quadrupole circuit breakers, their N-poles are always connected and do not close or disconnect with the other three poles. Therefore, this molded case circuit breaker, commonly known as "pseudo-quadrupole", is 3PN, and there is no essential difference between the three-pole molded case circuit breaker. The only thing that is more useful than a three-pole MCCB is that in the whole cabinet, the line access may be more convenient. Therefore, this circuit breaker can only be used for three-phase loads, and only for a small number of single-phase loads (if there is a controlled power supply, the whole set of 220V system is used).
|
More on that
|
The material of the transformer - Delixi
In view of the regulation and control effect of the transformer in the power system, technicians need to choose the appropriate transformer finishing device operation, so as to play a normal effect. Winding data is the primary problem that transformer devices need to pay attention to, and the effects of devices of different materials are different. Concerning...
|
|
Delixi control transformer structure type
Delixi's control transformer is one of the products used in many equipment, the type of Delixi transformer is divided into: BK, JBK, BKC, JMB, BJZ, DG, BZ and other series of control lighting transformers, with excellent performance, reliable work, wide applicability and other characteristics, generally used in machine tools, mechanical ...
|
|
The difference between Delixi LDO and DC-DC
The so-called DC-DC is actually DC to DC voltage, of course, LDO is also a kind of DC-DC, and only LDO can only achieve step-down.
The general DC-DC is mainly converted from DC to AC communication through the self-excited vibration circuit inside, so the external inductance and capacitor are required to achieve LC vibration (and LDO is only ...
|
|
Delixi DZ47LE C40 air switch introduction
The general leakage circuit breaker is wired using the principle of outgoing wire under the progressive line, only need to distinguish the phase line and the zero line, between, the zero line is marked with N on the right, and the incoming and outgoing lines are the same.
Delixi DZ47LE C40 ...
|
|
The general principle of circuit breaker selection - Delixi
(1) The additional operating voltage of the circuit breaker ≥ the additional voltage of the line.
(2) The additional current of the circuit breaker ≥ the line load current.
(3) The additional short-circuit of the circuit breaker can be turned on and off to ≥ the maximum shortness that may be present in the line.
|
|
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 ...
|
|
Problems in the installation and use of Delixi voltage regulator
What is the voltage regulator can not be connected in parallel, the voltage regulator is not open for a long time, what will be the problem with the voltage regulator still open under normal voltage, is it said that the voltage regulator and the undervoltage lamp is not lit to clarify that the voltage regulator is normal?
Will a normally open regulator burn it out at normal voltage?
...
|
|
AC contactor controls the forward and reverse rotation of the motor - Delixi
The forward rotation control of the asynchronous motor, the peers of the double contactor and the button are doing more, but is there anyone who will use an AC contactor to achieve the forward rotation control effect of the motor?
Practical application: general bench drill, letter ...
|
|
Delixi integrated voltage regulator knowledge
The role of a voltage regulator is to convert an unstable DC voltage into a stable DC voltage. The integrated voltage regulator has a wider and wider range of applications due to its advantages such as small size, good voltage regulation performance and perfect maintenance function. There are two types of integrated voltage regulators: linear power supply regulators and switching power supply regulators.
|
|
Delixi circuit breaker protection features
Quickness: It means that the maintenance device should be able to remove the short-circuit fault as soon as possible, and its purpose is to improve the stability of the system, reduce the damage to the faulty equipment and lines, reduce the scale of the fault, and improve the effect of active reclosing and active investment of standby power supply or standby equipment.
Reliability: Refers to ...
|
|
Delixi solid state relay relative to AC contactor characteristics
Delixi solid state relay and Delixi communication contactor are more used products, so what are the advantages of solid state relay relative to communication contactor, how should we choose when we can choose?
1. First of all, the solid ...
|
|
Delixi circuit breaker accessory function
Varieties of circuit breaker accessories
It is divided into two categories: in-flight accessories and out-of-flight accessories.
The accessories in the machine are the subordinate equipment of the equipment inside the circuit breaker, including four types: shunt tripper, undervoltage tripper, auxiliary switch and alarm switch. Normally the in-flight accessories have to be uncovered with the device, but now ...
|
|
Precautions for the use of Delixi three-phase AC voltage regulator
There are many types of three-phase communication regulators in Delixi, the most commonly used ones are SJW and SBW, etc., so we need to pay attention to the process of application:
First of all, it must be operated correctly according to the instructions of the voltage regulator.
|
|
Delixi occasion to choose the inverter
We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct selection of the type of inverter.
When selecting the inverter, the current value of the actual motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, the output of the inverter should be fully considered ...
|
|
Delixi circuit transformation attention to detail
1. If strong electricity and weak electricity are to be separated by a long distance from the horizon walking line, the interval should generally exceed 30 cm to prevent disturbance and be interspersed with each other.
2. In order to facilitate the future line change, the PVC pipe must be cut down and straightened as much as possible.
|
|
Delixi voltage regulator working principle
In Delixi voltage regulator, the voltage correction from and under voltage conditions is performed through two basic operations, namely Oersted and step-down operation. These operations can be switched on and off manually or automatically by electronic circuits. Under voltage conditions, the voltage of the boost operation is increased to the rated voltage.
|
|
Introduction of low dropout linear regulator - Delixi
LDO, or low dropout regulator, is a low-dropout linear regulator that uses a transistor or field-effect transistor (FET) operating in its saturation region to subtract the excess voltage from the input voltage used to generate a conditioned output voltage.
...
|
|
Delixi frequency converter E series precautions
1. Before the inverter device is in place and debugged, please tighten the components, especially the connecting bolts of the wire part, if not tightened, the connection will be heated and cause fire.
2. The on-site planning of the installation should be reasonable, and the excellent ventilation environment should be maintained.
3. The incoming and outgoing power lines of the inverter are not ...
|
|
Capacitor identification method of Delixi inverter
1. The capacitance is generally indicated by "C" plus a number in the circuit (e.g., C25 indicates the capacitance numbered 25).
A capacitor is an element composed of two metal films that are placed next to each other and separated by an insulating material. The characteristic of the capacitor is first and foremost the communication through the DC block. The size of the capacitance is ...
|
|
The reason for the existence of Delixi voltage regulator
In general, every electrical device or device is designed for a wide range of input voltages. Depending on the sensitivity, the operating scale of the device is limited to a specific value, for example, some devices can tolerate ±10% of the rated voltage, while others can tolerate ±5% or less.
...
|
|
Contact
working hours
