There are several types of circuit breaker time delay, and what does the circuit breaker time delay

The delay protection characteristics of the circuit breaker include four main protection functions: overload long delay protection, short-circuit short-delay protection, short-circuit instantaneous protection and grounding fault protection. Now its protection functions are concentrated on the same controller, through the panel operation for a variety of protection characteristics setting, universal circuit breaker supporting controller models are now divided into:

L-type, M-type, H-type, P-type, etc., the following is a brief introduction to the main functions and characteristics of each.

The L-type intelligent controller adopts the coding switch setting method, and has four protection characteristics such as overload long delay, short circuit short delay, short circuit instantaneous, and ground fault protection, as well as fault status display, load current light column indication and other functions. However, there is no LCD screen display, and the functions are not as complete as M-type, H-type, and P-type, and the setting value is adjusted gradually. The universal circuit breaker with L-type is available for users to choose in occasions with low requirements.

The M-type intelligent controller adopts LCD screen display, which can display the current running current and grounding current of each phase, and can also query and display the current value and occurrence time of setting, test and fault; Displays the current voltage of each line; Display the internal working environment temperature of the controller; Remote monitoring and self-diagnosis functions; The 5 buttons on the panel can be used to adjust and set various parameters of the controller steplessly; It can test the function of tripping and non-tripping of universal circuit breaker; load monitoring function; MCR on-break protection function; thermal memory function, etc.

Universal circuit breakers with M-type can be used in applications with general requirements. In addition to all the functions of the M-type controller, the H-type intelligent controller also has an RS485 standard communication interface; The LAN system (hereinafter referred to as the system) that can form a master-slave structure through a communication interface module; By 1 2 units as the master station, a plurality of circuit breakers or other communicable elements as slave stations, for the circuit breaker unit, the system can realize the long-distance "four remote" functions, namely remote communication, remote adjustment, remote control, telemetry, etc.; Remote monitoring of a variety of power grid parameters and operating parameters; The circuit breaker can remotely monitor the current operating status; Remote adjustment and inspection of various protection limit parameters; It can control the remote control of the circuit breaker by remote control of the operation of the splitting and closing. The system is suitable for the construction and transformation of power distribution monitoring systems such as various power stations, power plants, small and medium-sized substations, industrial and mining enterprises, buildings, etc.

In addition to the function of H-type controller, the P-type controller also has the function of ZSI area selective interlocking. Frequency measurement function; power factor measurement; active power p measurement; Reactive power Q measurement; harmonic measurements; Waveform capture, display and memory functions. The controller has perfect functions and two-way communication, which can help users analyze the current operation of the system.

Overload delay and short-circuit delay.

First, the working principle is different.

1) The energized delay time relay starts the delay immediately after obtaining the input signal, and the execution part of the relay needs to output the signal to manipulate the control circuit after the delay is completed; When the input signal disappears, the relay immediately returns to the state before the operation.

2) On the contrary, when the input signal is obtained, the execution part immediately has an output signal; After the input signal disappears, the relay needs to go through a certain delay before it can return to the state before operation.

Second, the difference between symbolic contacts.

The electrical symbol of the time relay coil, the power-on delay pick-up symbol is the left side of the ordinary relay plus the hollow block, and the power-off delay release symbol is the left side of the ordinary relay plus the solid block.

Time Relay Symbol.

The time relay of the power-on delay pick-up, the contact electrical symbol is the left side of the ordinary relay plus (= the time relay released when the power is off, and the contact electrical symbol is the left side of the ordinary relay plus ) = <>

Power-off delay time relay is generally used on equipment that continues to operate within a certain period of time after power-off. After the relay is energized, the internal magnetic holds, and the relay is converted from the normally closed contact to the normally open contact and maintained; After the user turns off the power of the time relay, the time relay starts to delay the action, and the contact continues to maintain the state at this time; When the delay time of the time relay is up, the contact switches from normally open to normally closed to form a regression, and waits for the next delay.

After the power failure, in order to make the time relay can get a good delay, the IC of the power-off delay relay must be used as a low-power integrated circuit, and a large capacitor is always required as the voltage energy storage. Generally speaking, two capacitors are needed internally for energy storage, and the energy stored by one capacitor needs to supply power to the integrated circuit and provide sufficient electrical energy.

Otherwise, the integrated circuit will lose power before the timing time arrives, and stop the timing work, and it will not achieve the purpose set by the user. The other capacitor provides the magnetic latching relay to the receiving IC, because the delay time expires after the output control signal to drive the magnetic, the latching relay can return to the initial state.

It is used on equipment that stops when it needs to continue operating for a certain period of time when the power is off.

It is mainly used in equipment that needs to continue to operate for a certain period of time when the power is off, and it is necessary to use a power-off delay relay to control it in many occasions. For example, if you need to control a motor, and the motor needs to be delayed for a period of time after pressing the stop button, the motor will be restarted to work, then a power-off delay relay is required to achieve the above functions.

A time relay is a controller with a delay function that is realized by an electronic circuit. According to the control occasion, it can be used optionally, such as: power-on delay type A; Power-off delay type f; star-delta time-lapse type y; Power-on time-delay type C with instantaneous output; Interval delay type g; Reciprocating delay type r; Specifications such as the disconnect delay signal type K are available to meet the required control situations.

The circuit breaker delay feature means that the circuit breaker needs a certain amount of time to carry out the correct protection action in the face of faults such as short circuits.

The delay time of circuit breaker means that when the circuit breaker encounters an electrical fault, such as a short circuit, it needs to carry out protection operation within a certain period of time. This delay time is controlled by the circuit breaker delay feature. Delay characteristics include long-term delay and short-time delay.

The setting of the delay time needs to take into account the operation of the circuit, the setting is not reasonable enough will lead to the circuit can not be protected normally, and the setting is too strict will lead to the misoperation of the circuit breaker, so it is necessary to make a reasonable choice according to the specific situation.

The buried delay characteristics of circuit breakers are very important in power system protection. By reasonably setting the delay characteristics, it can prevent damage to electrical equipment caused by short-circuit faults, and ensure the safe operation of the entire electrical system from taking the bush.

The meaning of long delay should be, first of all, the protection time can be set within a certain range, that is, within this time, if the current of the device (generally it should be the current) reaches the action value, the protection will not act, once the time range is exceeded, the current of the device still reaches the action value, at this time, the protection will act immediately.

If Wang Xiangguo's current drops within this set time range, it has dropped to the protection value when the time sleepiness Hu Bo arrives, and the protection will not act at this time, and will continue to run.

Long delay is generally used in low-voltage equipment, and equipment that starts for a long time with heavy load is used more (such as crushers), and sometimes it is also used in transformer protection.

There is no calculation method for long delay, short delay, and instantaneous time on the circuit breaker. Each manufacturer will define the long delay, short delay and instantaneous time of its own products, and the time defined by each manufacturer will be a little different, but it will be within a certain range. The long delay is generally 120 seconds to 300 seconds, the short delay is generally seconds to 12 seconds, and the instantaneous delay is generally the maximum second.

There is no calculation method for long delay, short delay, and instantaneous time on the circuit breaker.

Long delay, short delay and instantaneous time refer to the delay working state of the circuit breaker.

Long delay refers to a long delay time.

A short delay is a relatively short time.

Instantaneous is without delay.

The delay time can be set freely.

Not the same, two concepts.

Difference Between Power-Off Delay and Disconnect Delay:

Power-off delay means that after the coil of the timer is powered off, the contacts of the timer (including normally open and normally closed) will delay the action for a period of time.

There are two types of disconnection delays:

1. In the power-on delay (the power-on is for the coil), the disconnection delay means that after the timer coil is energized, the normally closed contact will be delayed for a period of time and then disconnected (the disconnection is for the normally closed contact);

2. In the power-off delay (the power-off is for the coil), the disconnection delay means that after the timer coil is power-off, the normally open contact that has been closed will be delayed for a period of time and then disconnected (the disconnection is aimed at the normally open contact);

The power-off delay and power-on delay are horizontal, and the objects are both coils; The disconnect delay and the power-off delay are subordinate, and the object of the disconnect delay is the contact.

Power-off delay, power-off delay is when the relay coil is energized and often open or normally closed, instantaneously closed or disconnected, after the relay coil is powered off, it begins to delay, and the original instantaneously closed or disconnected contacts are still in a closed or disconnected state. After the delay ends, the relay returns to its previous working state.

The power-on delay means that when the relay coil is energized, the power-on delay is always open and normally closed, and the action reaches the set time, that is, normally open becomes normally closed, and normally closed becomes normally open. When the energized delay time relay coil is powered off, the contact is reset to the initial state.