【Daily Topic】【Electrical Edition 20160704】
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Participation reward: 2 Wealth. Reward for correct answer: 9 Wealth. Question: What is inverse time overcurrent protection?
Inverse-time overcurrent protection refers to a type of protection whose operating time decreases automatically as the short-circuit current increases. The inverse-time overcurrent protection used in transmission lines enables faster isolation of faults at the beginning of the protected line
To achieve selective operation of overcurrent protection, the operating times of various protections are generally set according to a stepped principle. That is, the operating time of adjacent protections increases step by step from the load toward the power source, and the operating time of each set of protections remains constant, independent of the magnitude of the short-circuit current. Overcurrent protection with such a time-limit characteristic is called time-limited overcurrent protection. Inverse-time overcurrent protection refers to a type of protection whose operating time decreases automatically as the short-circuit current increases. The inverse-time overcurrent protection used in transmission lines enables faster isolation of faults at the beginning of the protected line.
Inverse-time overcurrent protection refers to a type of protection in which the operating time of the protective device decreases automatically as the overcurrent increases. The inverse-time overcurrent protection used in transmission lines enables faster isolation of faults at the beginning of the protected line.
Inverse-time overcurrent protection refers to a type of protection whose operating time decreases automatically as the short-circuit current increases.
When a short circuit occurs at different locations on the same circuit, the protective devices have different operating times due to the varying short-circuit currents. The short-circuit current is higher near the power source end, resulting in a shorter operating time; such protection is known as inverse-time overcurrent protection.
Inverse-time overcurrent protection refers to a type of protection in which the operating time of the protective device decreases automatically as the overcurrent increases. The inverse-time overcurrent protection used in transmission lines enables faster isolation of faults at the beginning of the protected line.
Q&A: What is inverse-time overcurrent protection? Answer: When a short circuit occurs at different locations on the same circuit, the short-circuit currents vary, which results in different operating times for the protective devices. The short-circuit current is higher near the power source end, leading to a shorter operating time; such protection is known as inverse-time overcurrent protection.
An overcurrent protection device in which the operating time is shorter when the fault current is larger, and longer when the current is smaller.
An overcurrent protection device in which the operating time is shorter when the fault current is larger, and longer when the current is smaller.
When a short circuit occurs at different locations on the same circuit, the protective devices have different operating times due to the varying short-circuit currents. The short-circuit current is higher near the power source end, resulting in a shorter operating time; such protection is known as inverse-time overcurrent protection. The advantage of inverse-time overcurrent protection is that the protection operates in a shorter time when a short circuit occurs near the power source ； The drawback is that coordinating the timing is complex; although the operating time is shorter when a short circuit occurs near the power source end of each circuit, compared to when a short circuit occurs at the end of the circuit, the total operating time remains long when there are many circuits.