Why measure the opening and closing time parameters of a circuit breaker?

The closing time of the circuit breaker refers to the process time from the initiation of the closing operation of the mechanism to the end of the overtravel bounce after the dynamic and static contacts. The opening time refers to the start of the opening operation of the mechanism and the end of the separation of the dynamic and static contacts. The closing and opening time of the circuit breaker is generally of no practical use, because if the closing and opening time does not meet the requirements, then its mechanism parameters (opening distance, overtravel, tripping force, final pressure, etc.) will also directly reflect the unqualified, generally speaking, just measure these parameters.

Of course, time can also be measured if you have sophisticated measuring instruments and equipment. In addition, the measurement method of the circuit breaker is generally as follows: open distance, overtravel:

The depth gauge can be measured, and the difference in the vertical direction of the dynamic and static contacts in the opening state is the opening distance; The circuit breaker is closed to measure the vertical distance between the moving contact and the base, the data is recorded, and then the static contact is removed by opening and then closing to measure the vertical distance between the moving contact and the base. The subtraction of the two is overtravel, and the overtravel data of different specifications is different. You can flip through your company's technical requirements standards.

One thing to note is that the opening distance of three or four phases and the overtravel should be balanced, that is, the data size should be consistent or as close as possible, so that the mechanism is qualified, if the opening between the phase and the phase is inconsistent with the overtravel, then the mechanism will be readjusted. Tripping force: Use Newton torque to top the drawbar, and write down the force value at the moment of tripping.

Final pressure: Use the multimeter chirping function to put it in the inlet and outlet line, which is generally the on-on chirping, and then use a force measuring tool to pull the moving contact vertically up, and wait until the moment when the chirp is not the final pressure. In addition, the closing and opening time can be measured in special equipment, such as special equipment for parameter setting of leakage circuit breakers.

Some aspects of the mechanical characteristics of circuit breakers are characterized by contact action time and speed of movement. In the mechanical characteristics test, the most important ones are the rigid opening speed, the rigid closing speed, the maximum opening speed, the opening time, the closing time, the integration time, the opening and closing time, and the simultaneity of opening and closing. Definition of part-time parameter: The opening time refers to the time interval from the beginning of the circuit breaker's opening operation (the moment of receiving the opening command) to the moment of contact separation of all poles.

Closing time refers to the time interval between when the circuit breaker is energized in the closing circuit and when all the pole contacts are in contact. The split-close time is the time interval from the moment when all pole contacts are separated to the moment when the first contact is contacted. Closing - Dividing time is the time interval from the moment of contact contact of the first contact to the moment when all the pole contacts are separated during the subsequent operation of the circuit breaker during the closing process of the unsuccessful re-platform switch or when the individual platform is operated.

The synchronicity of opening and closing operation refers to the time difference between the three-phase breaking and contact moments of the circuit breaker during the opening and closing operations, as well as the time difference between the contact breaking and contact moments of each orphan extinguishing unit in the same phase. <>

The temperature transmitter uses thermocouple and thermal resistance as the temperature measurement element, and the output signal from the temperature measurement element is sent to the transmitter module, and after the voltage stabilization filter, operation amplification, nonlinear correction, V i conversion, constant current and reverse protection and other circuit processing, it is converted into a 4 20mA current signal 0-5V 0-10V voltage signal with a linear relationship with the temperature, and RS485 digital signal output. A temperature transmitter is a meter that converts a temperature variable into a standardized output signal that can be transmitted. It is mainly used for the measurement and control of temperature parameters in industrial processes.

A transmitter with a sensor usually consists of two parts: the sensor and the signal converter. Sensors are mainly thermocouples or RTDs; Signal converters are mainly composed of a measuring unit, a signal processing and conversion unit (because the industrial RTD and thermocouple indexing tables are standardized, the signal converter is also called a transmitter as a stand-alone product), some transmitters have an additional display unit, and some have fieldbus functions.

If the transmitter consists of two sensors that measure the temperature difference, there is a given continuous function relationship between the output signal and the temperature difference. Therefore, it is called a temperature transmitter. There is a given continuous function (usually linear) between the transmitter output signal and the temperature variable, and the output signal of the early production transmitters is a linear function with the resistance (or voltage) value of the temperature sensor.

The standardized output signals are mainly DC signals of 0mA, 10mA and 4mA, 20mA (or 1V 5V). Other standardized output signals with special provisions are not excluded. The temperature transmitter can be divided into two-wire system and four-wire system according to the power supply wiring method, except for the RWB type temperature transmitter which is three-wire system.

The transmitters are available in the electric unit instrument cluster series and the miniaturized modular and multi-functional intelligent ones. The former does not have a sensor, and the latter two types of transmitters can be easily combined with thermocouples or RTDs to form a transmitter with a sensor. <>

The length of the circuit breaker opening and closing operation time is related to the performance of the circuit breaker breaking and closing fault current, which is one of the important parameters of the circuit breaker. Each type of circuit breaker has a corresponding action time, if the action time after installation or maintenance does not meet the specified opening and closing time, it proves that the circuit breaker is poorly debugged or there is an abnormal phenomenon in the mechanical aspect. When measuring the opening and closing time of the circuit breaker, it should be carried out under the rated operating voltage, rated air pressure or rated hydraulic pressure of the circuit breaker after the opening and closing speed adjustment and measurement are completed.

If these parameters are different, the measured results are often different. There are many instruments for measuring the opening and closing time of circuit breakers, and the methods are not the same, and the corresponding opening and closing time should be measured according to its definition and relevant regulations. However, no matter which method is used for measurement, the measured value should comply with the provisions of the technical conditions of the product.

Summary. Glad to be able to your questions.

In general, there are two states.

The red signal indicator of the opening and closing signal of the high-voltage circuit breaker is on, indicating that the circuit breaker is in the state of closing operation and indicating that the circuit is in good condition. The green signal indicator light is on, and the Meter circuit breaker is in open state, indicating that the closing circuit is intact.

All circuit breakers are the same, i.e. the closing position is shown in red and the opening position is shown in green.

The circuit breaker is divided into 4 signal lights, namely: closing signal light, the color is red; Open signal light, the color is green; Fault signal light, yellow color; Position signal light, white in color. For the indicator:

Red means hazard and is running, and green is safe and stopped. 2 control buttons, namely: closing control button, the color is green; Open control button, color red.

For automatic control systems, the running indicator is green and the stop status is red. Other special equipment is not discussed here, please refer to the national standard.

Hope mine can help you!

The circuit breaker opening and closing status indicator is divided into several states.

I'm glad to serve you, it takes about five minutes to sort out the answers, please wait patiently, a ray of happiness will be a good answer for you!

Glad to be able to your questions. In general, there are two states. The red signal indicator of the opening and closing signal of the high-voltage circuit breaker is on, indicating that the circuit breaker is in the state of closing operation and indicating that the circuit is in good condition. The green signal is that the sail indicator light is on, and the Gauer circuit breaker is in the open state, indicating that the closing circuit is intact.

All circuit breakers are the same, i.e. the closing position is shown in red, and the opening position is shown in green. The circuit breaker is divided into 4 signal lights, namely: closing signal light, the color is red; Open signal light, the color is green; Fault signal light, yellow color; Position signal light, white in color.

For the indicator light: red indicates hazard and is running, green indicates safe and stopped. 2 control buttons, respectively:

Closing control button, color is green; Open control button, color red. For automatic control systems, the running indicator is green and the stop status is red. Other special equipment stove acacia is not discussed here, please refer to the national standard.

Hope mine can help you!

The detection method of circuit breaker opening and closing at the same time is as follows:

1. At one end of the moving contact of the three-phase circuit breaker, a small power supply is applied, and one end of the static contact is connected to the indicator light through the wire fiber.

2. Use manual closing to operate the closing mechanism of the circuit breaker, so that the mechanism slowly approaches the closing position.

3. If the three circuit breakers have good periodicity, the three bulbs will be lit at the same time at the moment when the dynamic and static contacts are just in contact; If the three periods are inconsistent, the bulbs will be lit in order. Follow the above steps to detect whether the opening and closing of the nuclear circuit breaker is good at the same time.

The detection method of circuit breaker opening and closing at the same time is as follows:

1. A small power supply is applied at one end of the moving contact of the three-phase circuit breaker, and the other end of the static contact is connected to the indicator light through a wire.

2. Use manual closing to operate the closing mechanism of the circuit breaker, so that the mechanism slowly approaches the closing position.

3. If the three circuit breakers have good periodicity, the three digital slag bulbs will be lit at the same time at the moment when the dynamic and static contacts are just in contact; If the three periods are inconsistent, the bulbs will be lit in order. Follow the above steps to operate with a wide grip to detect whether the circuit breaker is opening and closing well at the same time.

The time interval between the moment when the first pole contact contacts are in contact during a closing operation and the moment when all the mid-arc contacts are separated in a subsequent opening operation.

Before closing operation, first check that the circuit breaker is fully (from cold standby) to (in) hot standby. It includes: the isolation switches on both sides of the circuit breaker have been in the closed position, the main and auxiliary relay protection devices of the circuit breaker have been put into accordance with the regulations, and the closing energy and operation control energy have been invested.

The signal indication of each position is correct.

Operate the circuit breaker control handle, pay attention to the appropriate force. The control handle is twisted to the closing position, and the instantaneous impact is observed in the instrument indication (there is no change in the empty ** road), and it can only be returned after the red light is on, and the circuit breaker cannot be closed too quickly.

After the operation is closed, check that the pointer of the circuit breaker closing circuit ammeter returns to zero, and the measuring instrument and signal indication and the position of the mechanism should be inspected on the spot. For example: the indication of the ammeter and the power meter when the load situation of the circuit, the indication of the opening and closing position indicators, etc., so as to make a correct judgment that the operation result is good.

The purpose of the measurement is to check whether it is within the range required by the regulations, if it does not meet the requirements, it is easy to cause system overvoltage (also known as operating overvoltage) during operation, which affects the power quality.

The period from the time the operating mechanism receives the closing instruction to the completion of the closing of the high-voltage circuit breaker is called the "inherent closing time of the circuit breaker".

The time from the time the operating mechanism receives the opening instruction to the completion of the opening of the high-voltage circuit breaker is called the "inherent opening time of the circuit breaker".

The inherent closing and opening time of the circuit breaker is generally a few tenths of a second, and the accurate measurement of the opening and closing time of the circuit breaker is to reasonably set the action time of the relay protection device and the coordination of the setting value of the relay protection of the upper and lower circuit breakers.

For example, if the overcurrent time of a circuit breaker is fixed in seconds, it does not mean that it trips in seconds after failure, and the inherent opening time of the circuit breaker must be added to cut off the fault. The value of the fault current cut-off at different times is different, so the inherent action time of the circuit breaker will also be involved when verifying the arc extinguishing capability of the circuit breaker.

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!

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.