What are the main protection functions of transparent RCD?

The main protection functions of transparent RCD are ( ) In the transformation of the two networks, a large number of residual current action leakage protectors are used, and after a few years, it has been proved that the leakage protectors are damaged and the phenomenon of artificial release is very serious. The problem of electricity loss and safe electricity use is still severe. There are many reasons for correcting it, but the direct cause is the frequency and rejection of the leakage protector, which seriously affects the normal electricity consumption, so that the pipe and electricity personnel lose confidence in the leakage protector and even give up.

In the process of the implementation of the two network transformation projects, the leakage protection device - residual current action protector is widely used. Practice has proved that the application of protectors has been greatly reduced.

Personal electric shock accidents, but also play a role in supervising the insulation level of the line, the effect of safe electricity use is remarkable. Experience at home and abroad has proved that in low-voltage power grids, the installation of protectors is an effective protective measure to prevent personal electric shocks, electrical fires and damage to electrical equipment. ”

The RCD is very sensitive to the ground fault of the protection loop and can also be used as a backup against direct contact shock. This has been proven in the practical use of RCD in our country for many years. However, the main protection function of transparent RCD against RCD is ().

a. Isolation protection.

b. Leakage protection.

c. Short-circuit protection.

d. Overload protection.

e. Lightning protection.

Questions that may interest you.

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Thermal overload, short circuit, leakage.

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3. The shopping points and self-pay items are clearly written, and there will be no more things for you at that time. 4. The team leader and director are very hard-working, and they don't have to let you buy things when you get to the shopping point.

RCD is the symbol of "residual leakage action protector", commonly known as "leakage protection".

The residual current device (RCD) is an internal leakage protection device. The leakage protection device is a kind of low-voltage safety protection electrical appliance, and its functions are:

1. It is used to prevent single-phase electric shock accidents caused by leakage;

2. It is used to prevent fire and equipment burning accidents caused by leakage;

3. It is used to detect and cut off all kinds of one-phase grounding faults;

4. Some leakage protection devices can also be used for overload, overvoltage, undervoltage and phase loss protection.

Leakage protector, referred to as leakage switch, also known as leakage circuit breaker, is mainly used in the event of leakage failure of equipment and protection of fatal danger of personal contacts, with overload and short circuit protection functions, can be used to protect the overload and short circuit of the line or motor, and can also be used as an infrequent conversion and start of the line under normal circumstances.

How RCD works: When electrical equipment leaks, abnormal current and voltage signals will be presented. The leakage protection device detects this abnormal current or abnormal voltage signal, and through signal processing, prompts the actuator to act, quickly cuts off the power supply with the help of switchgear, and implements leakage protection The leakage protection device that acts according to the fault current is a current-type leakage protection device, and the voltage-type leakage protection device that acts according to the fault voltage is a voltage-type leakage protection device.

RCD: Residual Current Device (RCD): Under normal working conditions, the load is switched on and the current is disconnected;

And when the residual current of the circuit reaches its specified value under the specified conditions, it causes the contact action and disconnects the main circuit as a protector. A residual current device may be a combination of various components that sense residual current and turn on and off the main circuit current.

How it works: When electrical equipment leaks, abnormal current and voltage signals will be presented.

The leakage protection device detects this abnormal current or abnormal voltage signal, and through signal processing, prompts the actuator to act, quickly cuts off the power supply with the help of switchgear, and implements leakage protection The leakage protection device that acts according to the fault current is a current-type leakage protection device, and the voltage-type leakage protection device that acts according to the fault voltage is a voltage-type leakage protection device.

Electronic RCD is widely used in China, and electromagnetic RCD is widely used abroad. The following mainly introduces the current type leakage protection device (i.e., RCD).

Residual Current Action Protector (RCD).

Residual Current Devices (RCD).

1. Briefly describe the principle.

The main characteristics of RCD are shown in Figure F67 below.

Its iron core wraps around all the current-carrying conductors of an electrical circuit, and the magnetic flux generated in the magnetic core is related to the arithmetic sum of the currents of these conductors in an instant; If the current flowing in one direction is assumed to be positive (i1), then the current flowing in the opposite direction is negative (i2).

In a fault-free normal circuit i1 + i2 = 0, there is no magnetic flux inside the core and the electromotive force inside the coil is zero. The ground fault current ID flows through the core to the point of fault, but returns to power via ground or through the protection line of the TN system.

As a result, the current passing through the conductors of the core is no longer balanced, and the current difference generates a magnetic flux within the core.

This current is called the "residual" current, and this principle is also known as the "residual current" principle.

The variable flux generated in the core induces an electromotive force in the windings, so that a current i3 flows through the coil that actuates the tripper. If the residual current is greater than the current value that can make the tripper operate, whether it is directly operated or operated by electronic or relay operation, the circuit breaker will trip.

What does it mean to have 24 points in middle school? It should be a triode.

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It should be to prevent color fading and increase brightness.

It looks a little better and doesn't fade easily.

The transparent one is essentially a civilian series, and the safety factor is not high, so it should not be used in flammable and explosive areas.

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