1SVR011712R1700 ABB relay control device accessory module

Description

1SVR011712R1700 maximum actual short-circuit current: 2687A, full breaking time 35.06ms
On the figure, the width of each column is 10ms. In the part between the red lines, the short circuit current is basically kept at 2687A, and the time is about 28ms. This time is the short time delay protection mentioned above: S
During the 28ms when the circuit breaker was “burned” by the short circuit current of 2687A, the lower level circuit breaker was busy breaking. If the lower level circuit breaker disconnected the short circuit current, 1SVR011712R1700 would not break the circuit breaker. After the 28ms delay time, the short circuit current would still exist, and the circuit breaker would start to open.

1、 I understand the protection characteristics according to the learning materials:
1. The time to cut off short circuit current varies with different protection characteristics:
Long delay L (long delay) is generally the second pole
Short circuit instantaneous protection I (Instance) is generally of millisecond level
Short circuit short delay protection S (Short delay) is generally based on short circuit instantaneous protection plus 10~100ms
2. 1SVR011712R1700 time unit magnitude difference of different protection characteristics is determined by the following factors:
After the release recognizes the fault current, [the time required to convert the identified “fault current signal” into a “mechanical signal” that triggers the release mechanism of the circuit breaker]
According to the way of identifying fault current, releases can be divided into two categories: thermal magnetic release (TM) and electronic release
2.1 TM thermal magnetic release
Thermal magnetic release protection features include long time delay protection L and short circuit instantaneous protection I, which are referred to as LI {those with two protection features are called multiple tripping, and only single electromagnetic tripping with short circuit instantaneous protection – M}
2.1.1 Long time delay protection characteristics
The core device is bimetallic sheet, and the action mechanism is as follows (excerpted from the DC model selection manual of Beijing People’s Electric Appliance Factory)
“The overload current makes the heating element generate heat Q (Q=I2Rt), which makes the bimetallic sheet attached to the heating element bend, that is to say, facing the fault current, the bimetallic sheet will
The information of “fault occurrence” is transmitted to the actuator in the form of “bending”, and the actuator separates the dynamic and static contacts of the circuit breaker. The time t required to transmit this information to the actuator is inversely proportional to the square of the current I,
Therefore, the overload tripping of the circuit breaker is of inverse time characteristics. ”
]Reference a curve to see: [When it comes to curves, I am usually more vigilant. Consider it, let’s use Siemens’. It’s more like doing experiments]

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