Overcurrent protection device and method suitable for protection and measurement integrated CT
An integrated technology of overcurrent protection, which is applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, and protection reacting to overcurrent, etc. Problems such as the inability to transmit and change the current correctly can achieve the effect of improving the reliability of the operation, expanding the scope of power outages, and improving the reliability of power supply
Pending Publication Date: 2021-01-22
ZHEJIANG HUAYUN INFORMATION TECH CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the problems in the prior art when the transformer is empty-charged, the protection CT can easily cause deep saturation, the current cannot be transmitted and changed correctly, and it is easy to cause the distribution network protection to refuse to operate or malfunction, and then a leapfrog trip accident occurs. The safety of the equipment itself and the stable operation of the system constitute a serious hazard, and an overcurrent protection device and method suitable for integrated CT with protection and measurement are provided.
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[0027] An overcurrent protection method suitable for a CT integrated with protection and testing, comprising the following steps:
[0028] Step 1, the overcurrent protection device starts and detects the phase current of the circuit. If the phase current of the circuit is greater than the set value, then jump to step 2. If the phase current of the circuit is less than or equal to the set value, continue to maintain detection;
[0029] Step 2. The overcurrent protection device uses the two-point method to calculate the current amplitude and conduct overcurrent judgment. If the current amplitude exceeds the set value, then jump to step 3. If the current amplitude does not exceed the set value , skip to step 1;
[0030] In step 3, the overcurrent protection device outputs an overcurrent alarm, and at the same time, the overcurrent protection device performs a corresponding operation to protect the circuit.
[0031] The current amplitude calculated by the two-point method is spec...
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The invention discloses an overcurrent protection device and method suitable for a protection and measurement integrated CT, which solve the defects in the prior art. The method comprises the following steps that 1, the overcurrent protection device starts and a circuit phase current is detected, a step 2 is carried out if the circuit phase current is greater than a set constant value, and if thecircuit phase current is smaller than or equal to the set constant value, detection is keptcontinuously; 2, the overcurrent protection device calculates a current amplitude by adopting a two-point method, performs overcurrent judgment, skips to the step 3 if the current amplitude exceeds a set constant value, and skips to the step 1 if the current amplitude does not exceed the set constant value;and 3, the overcurrent protection device outputs an overcurrent alarm, and the overcurrent protection device carries out corresponding operation to protect the circuit.
Description
technical field [0001] The invention relates to the technical field of power system distribution network protection, in particular to an overcurrent protection device and method suitable for a CT integrated with protection and measurement. Background technique [0002] At present, in the abnormal operation and fault state of the power system, the current conversion of the corresponding circuit is supplied to the relay protection device and other similar electrical appliances, such as overcurrent protection, distance protection, differential protection, etc. The measurement accuracy requirements are 10P10, 10P20, 5P10, 5P20, etc. Its meaning Take 10P10 as an example, when the current flowing through the primary side is within 10 times the rated current, the secondary output error is less than 10%. For protective current transformers (CT), the excitation current is the main cause of error. The larger the dynamic range of the protective CT, the greater the fault current on bo...
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IPC IPC(8): H02H7/04H02H3/08H02H3/04H02H3/26H02H3/05H02H7/26
CPCH02H7/042
Inventor 陈茂锐汪志灏周旭虹陆沈雄王炯耿柴华明卢菲菲林坊辉袁琪李堃董栋孙晓超徐晓波陈思俞立陈燎原杨承
Owner ZHEJIANG HUAYUN INFORMATION TECH CO LTD