What is the difference between the intrinsic open time and the full open time of a high voltage circ

Opening times include: full disconnect time and arcing time.

Extended introduction: opening time (breaking time) = arcing time full disconnection time.

Opening time (breaking time): The time interval from the beginning of the disconnection of the mechanical switch electrical appliance to the end of the arcing time.

The bouncing time switches the time between the moving and static contacts from the first time they are separated (or closed) to the last stable opening (or closing).

As follows:

Closing time refers to the time required from the closing mechanism of the switch to the time when the switch is fully switched on when the closing mechanism of the switch receives the closing command.

The break time is equal to the sum of the switch's intrinsic break time and arc extinguishing time.

The closing (opening) buffer time is greater than the breaking time. It includes coil start time, mechanism transfer time, compression (over)stroke action time, and breaking time.

Introducing the breaking time, arcing time, and disconnection time.

Breaking time refers to the time from the separation of the moving and static contacts of the circuit breaker to the extinguishing of the arc (the circuit is truly disconnected);

Closing and dividing time refers to the time from the opening coil (closing coil) of the circuit breaker to the start of the circuit breaker to the end of the closing (opening) position, which includes the coil starting time, the transmission time of the mechanism, the compression (over) stroke action time, the breaking time, the remaining travel time, and the closing (opening) buffer time, which is greater than the breaking time.

If the tripping current value of the low-voltage circuit breaker is less than 6, it is basically useless in the distribution line, and if it is less than 6, the tripping current value can only be used as the control switch of low-power electrical appliances.

There are several kinds of closing locking for voltage time type circuit breakers, for double bus with bypass wiring, when a circuit breaker of an outgoing unit is divided and closed for some reason, and the bypass circuit breaker is used to connect the circuit in parallel; For the wiring of one and a half switches, when a certain series of circuit breakers is divided and closed, the disconnecting switch can be used to untie the loop (but it should be noted that all circuit breakers of other strings must be in the closing position); For the single-segmented wiring mode of the double-defeat dry bus, when one of the two bus circuit breakers and the segmented circuit breaker is locked between the two bus breakers and the segmented circuit breaker, Qingshan can use the isolation switch to disconnect the circuit. It is used to interrupt the small current circuit and the side (loop) current. pull-and-close voltage transformers and lightning arresters; The capacitive current of the equipment directly connected to the busbar and the pulling, closing busbar; No-load transformer excitation current below 2A; Charging current for no-load lines below 5A.

The full opening time of the circuit breaker refers to the time from the moment of receiving the opening order to ().

a.The arc of the phase contact is extinguished until the mold is chaotic.

b.The sedan has an arc contact, and the yard is empty at the moment when it is separated.

c.All arc contacts reach the open position.

d.Until the arc between the contacts at each pole finally goes out (correct answer).

The high-voltage circuit breaker can be roughly divided into two kinds according to the operating mechanism, one is the three-phase contact using a group of operating mechanisms (spring energy storage, hydraulic energy storage, electromagnetic can be) and the other is the use of a set of operating mechanisms for each contact (high voltage, like 220kv, 500kv, each phase of the operating mechanism is independent).

For the use of a group of operating mechanisms for three-phase contacts, it is generally rare to have the problem of long time for different periods of breaking, because the commissioning has been carried out when leaving the factory, but it should also be measured after installation.

For each contact, it is more complicated to use a set of operating mechanisms, and the three phases can be opened and closed independently, or they can be opened and closed together. However, if the control system is not set up properly, there may be a phase out of sync problem.

Our electrical professionals all know that the AC switch is the use of current natural zero crossing to extinguish the arc, the switch has a strict action timing setting in the debugging process, once it leaves the action sequence setting, it is possible that the instantaneous current of opening and closing is very large, and the contact is burned out. There is even a non-simultaneous closing.

Therefore, the time of different periods of separation and closing of the high-voltage circuit breaker is a very important parameter of the high-voltage circuit breaker, which is related to the safety of itself, the generator, the power grid and the load during the operation of the switch.

The popular explanation is the time difference between the first closing and the last closing of the three-phase contact of the circuit breaker, and the time difference between the first opening and the last opening when the circuit breaker is opened. It's a very short time.

That is, there will be different periods of three-phase closing and opening when the sedan is closed and opened, of which the maximum value is the maximum different period time, if the three-phase different periods are too large, then there are many harms: (1) the neutral point voltage displacement, the zero sequence current is generated, and the setting value of the zero sequence protection must be increased, which reduces the sensitivity of the protection; (2) Cause overvoltage, especially in the case of the first phase is more serious than the first phase. For the transformer powered by the two-sided power supply, it will seriously threaten the neutral point insulation of the polar separation insulation transformer of the neutral point ungrounded system, which may cause the neutral point arrester**; (3) Increase the reclosing time in the same period.

It is not good for the stability of the system; (4) When the circuit breaker is closed in a three-phase short circuit, if the two phases are closed first, the voltage of the unclosed phase will increase, the pre-penetration length will be increased, the requirements for the closing work will be increased, and the mechanical strength of the arc extinguisher will also be higher.

The time between the phase that closes and opens first and the phase that closes and opens last. The maximum different period time of circuit breaker closing and opening is closely related to the neutral point overvoltage time!

Opening time (breaking time) Arcing time Disconnection time.

Disconnect time. The time interval from the moment the disconnect operation starts to the moment when all the arc contacts of all poles are separated.

Arc time. The time interval from the moment the first arc is generated to the moment when all polar arcs finally go out.

Opening time (breaking time).

The time interval from the moment when the mechanical switch is opened to the moment when the arcing time ends.

The opening time is the time from the time when the opening instruction is given to the separation of all phases, which is all phases; The corresponding closing time refers to the time from receiving the closing order to all phases, which is also all phases.

The circuit breaker opening time is the time taken from the time the signal is given to the time the circuit breaker is opened and disconnected.

The high-voltage circuit breaker plays a controlling role in the high-voltage circuit and is one of the important electrical components in the high-voltage circuit. The circuit breaker is used to turn on or off the circuit during normal operation, quickly disconnect the circuit under the action of relay protection device in the fault case, and reliably turn on the short-circuit current under special circumstances (such as when automatically reclosing to the fault line). A high-voltage circuit breaker is a special electrical appliance that turns on or off a high-voltage circuit under normal or fault conditions.

What are the specific requirements for the opening and closing time of the high-voltage circuit breaker and the simultaneity of opening and closing during the operation of the high-voltage circuit breaker? Let's introduce it to you!

The opening and closing time and simultaneity are important parameters for the mechanical characteristics of SF6 circuit breaker. The opening and closing time directly affects the closing and breaking performance of the circuit breaker. Only by ensuring the appropriate opening and closing time can the circuit breaker give full play to its ability to break the current.

If the opening time is too long, it will increase the arcing time, especially when the open circuit fault is removed, the long burning time may burn the contact, and even occur**. If the opening and closing time is seriously different, it will cause the line or transformer to be connected or cut off in non-full phase, and there will be an overvoltage that endangers the insulation.

1) Opening time. It is a period of time from the issuance of the opening command (which refers to the circuit of the opening circuit being turned on) to the time when the arc extinguishing contact has just separated. The method of measurement of the opening time is carried out.

For high-voltage circuit breaker equipment with shunt resistance, the opening time of its shunt resistor contacts should also be measured.

2) Closing time. It is a period of time from the issuance of the closing command (referring to the closing circuit on) to the contact of the main arc extinguishing of the last phase. The method of measuring the closing time is carried out"For high-voltage circuit breaker equipment with shunt resistance, the closing time of its resistive contacts should also be measured.

3) Simultaneous opening and closing. The synchronicity of opening and closing mainly refers to the different periods between the three phases, and the different periodicities between the faults of the same phase should also be measured for multi-break circuit breakers. The synchronicity of opening and closing should be measured according to the actual operation mode of the high-voltage circuit breaker equipment.

The contemporaneous error caused by the different contact of the arc contact or the protective ring can not be included after identification.

This question is indeed more professional, the closing time on the circuit breaker nameplate generally refers to the beginning of the closing command, to the last phase of the main interrupter contact just contact for a period of time. Since there is a time difference in the moment of three-phase closing, there is also an important indicator, which is the synchronicity of the switch. As for what you said about how to keep the leading angle in line with the requirements, this needs to be further checked.