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Anonymous users2024-02-061.Overcurrent protection for the setting of the operating current.
The transformer overcurrent protection action current is set according to the maximum load current ItMax of the transformer, and the setting calculation formula is IOP=(KWKREL KrekiitMax.)
where: kw is the wiring coefficient of the protection device, the wiring coefficient of the two-phase 2 relay is 1, and the wiring coefficient of the two-phase 1 relay is 3;
krel is the reliability coefficient of the protection device (generally taken;
KRE is the relay return coefficient (generally taken;
ki is the current transformer ratio;
Itmax is the maximum load current of the transformer.
2.Overcurrent protection operation time.
For the workshop substation in the power supply system of the factory, because it belongs to the terminal substation of the power system, the overcurrent protection action time of the transformer can be set to the minimum value, if the protection device is divided into two levels before and after, the action time should ensure the selectivity of the action, and it can be pressed"The ladder principle"Tuning.
3. Setting of quick-break protection action current.
To tune, the formula is as follows:
iqp=krelkwikmax/ki
When selecting the relay, it should be noted that the protection value should not be in the maximum or minimum area of the relay value, which will affect the accuracy of the action, and the relay value should be calibrated regularly, and the overall linkage experiment should be done together with the switch cabinet after the calibration is completed, so as to ensure its reliable action.
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Anonymous users2024-02-05Count, how to set up. What parameters are required.
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Anonymous users2024-02-041.Overcurrent protection for the setting of the operating current.
The transformer overcurrent protection action current is set according to the maximum load current ItMax of the transformer, and the setting calculation formula is IOP=(KWKREL KrekiitMax.)
The volt key in the formula: kw is the wiring coefficient of the protection device, the wiring coefficient of the two-phase 2 relay is 1, and the wiring coefficient of the two-phase 1 relay is 3;
krel is the reliability coefficient of the protection device (generally taken;
KRE is the relay return coefficient (generally taken;
ki is the current transformer ratio;
Itmax is the maximum load current of the transformer.
Overcurrent protection operation time.
For the workshop substation in the factory power supply system, because it belongs to the terminal substation of the power system, the overcurrent protection action time of the transformer can be set to the minimum value, if the protection device is divided into two levels before and after, the action time should ensure the selectivity of the action, and it can be pressed"The ladder principle"Tuning.
Setting of quick-break protection action current.
To tune, the formula is as follows:
iqp=krelkwikmax/ki
When selecting the relay, it should be noted that the protection value should not be in the maximum or minimum area of the relay value, which will affect the accuracy of the action, and the relay value should be calibrated regularly, and the overall linkage experiment should be done together with the switch cabinet after the calibration is completed, so as to ensure its reliable action.
-
Anonymous users2024-02-031.Overcurrent protection for the setting of the operating current.
The transformer overcurrent protection action current is set according to the maximum load current ItMax of the transformer, and the setting calculation formula is IOP=(KWKREL KrekiitMax.)
where: kw is the wiring coefficient of the protection device, the wiring coefficient of the two-phase 2 relay is 1, and the wiring coefficient of the two-phase 1 relay is 3;
krel is the reliability coefficient of the protection device (generally taken;
KRE is the relay return coefficient (generally buried;
ki is the current transformer ratio;
Itmax is the maximum load current of the transformer.
2.Overcurrent protection operation time.
For the workshop substation in the power supply system of the factory, because it belongs to the terminal substation of the power system, the overcurrent protection action time of the transformer can be set to the minimum value, if the protection device is divided into two levels before and after, the action time should ensure the selectivity of the action, and it can be pressed"The ladder principle"Tuning.
3. Setting of quick-break protection action current.
To tune, the formula is as follows:
iqp=krelkwikmax/ki
When selecting the relay, it should be noted that the protection value should be in the maximum or minimum area of the relay value, which will affect the accuracy of the action, and the relay value should be calibrated regularly, and the grinding body linkage experiment should be done together with the switch cabinet after the calibration is completed, so as to ensure its reliable action.
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