Current transformer secondary overvoltage protector
A technology of current transformer and secondary overvoltage, which is applied in the direction of emergency protection circuit devices, emergency protection circuit devices, electrical components, etc. for limiting overcurrent/overvoltage, and can solve the problem of endangering the lives of workers and the insulation of secondary systems. Hazards and other issues, to achieve the effect of fast action speed, strong overload capacity, and meet the protection requirements
Inactive Publication Date: 2015-10-21
ANHUI RUIHONG MDT INFOTECH
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Problems solved by technology
[0002] Current transformers are widely used in primary measurement and control in power systems. If the secondary winding of the current transformer is open circuited or the primary winding flows abnormal current during operation, such as lightning strikes, resonant currents, and electrothermal charging currents, etc. , will generate thousands of volts or even tens of thousands of volts of high voltage on the secondary side, which will not only cause damage to the insulation of the secondary system, but also endanger the lives of workers
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[0008] see figure 1 , a current transformer secondary overvoltage protector, which includes a logic control circuit, an overvoltage detection circuit, a thyristor protection device, one end of the logic control circuit is connected to one end of the thyristor protection device and one end of the current transformer, The other end is connected to one end of the circuit load, the other end of the thyristor protection device is connected to one end of the overvoltage detection circuit and the other end of the current transformer, and the other end of the overvoltage detection circuit is connected to the other end of the circuit load.
[0009] The current transformer secondary overvoltage protector of the present invention is mainly used for abnormal overvoltage protection on the secondary side of various CTs. The protector is fixedly connected to both ends of the CT secondary winding, and the leakage current is extremely small during normal operation, showing high resistance. sta...
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A current transformer secondary overvoltage protector relates to the technical field of power system overvoltage absorption. The current transformer secondary overvoltage protector comprises a logic control circuit, an overvoltage detection circuit, and a silicon controlled rectifier protection device. One end of the logic control circuit is connected with one end of the silicon controlled rectifier protection device and one end of a current transformer, the other end of the logic control circuit is connected with one end of a circuit load, the other end of the silicon controlled rectifier protection device is connected with one end of the overvoltage detection circuit and the other end of the current transformer, and the other end of the overvoltage detection circuit is connected with the other end of the circuit load. The system overvoltage suppression device of the invention has the advantages of fast action, strong overload capacity and small static leakage current, and can meet the protection demand of all kinds of current transformers.
Description
technical field [0001] The invention relates to the technical field of power system overvoltage absorption, in particular to a secondary overvoltage protector for a current transformer. Background technique [0002] Current transformers are widely used in primary measurement and control in power systems. If the secondary winding of the current transformer is open circuited or the primary winding flows abnormal current during operation, such as lightning strikes, resonant currents, and electrothermal charging currents, etc. , will generate thousands of volts or even tens of thousands of volts of high voltage on the secondary side, which will not only cause damage to the insulation of the secondary system, but also endanger the lives of workers. Contents of the invention [0003] The purpose of the present invention is to provide a secondary overvoltage protector for current transformers, which has fast action speed, strong overload capacity and small static leakage cu...
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Inventor 谢海亭
Owner ANHUI RUIHONG MDT INFOTECH