Small current grounding line selection device and control method of voltage disturbance locked line selection

A low-current grounding and control method technology, applied in emergency protection circuit devices, measuring devices, measuring electricity and other directions, can solve the misunderstanding and inconvenience of operators on duty, the wrong start of low-current grounding line selection device, and affect the accuracy of device line selection. and other problems, to achieve high action reliability and sensitivity, improve action accuracy, and achieve significant application effects.

Active Publication Date: 2014-07-02
DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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Problems solved by technology

[0011] Operation experience shows that interference factors such as resonance overvoltage, PT phase failure, and three-phase voltage imbalance in the system will cause false start-up of the small current grounding line selection device, causing misunderstanding and inconvenience to the operators on duty, and affecting the line selection of the device Accuracy
At present, the small current grounding line selection device applied to the power transmission and distribution site has not been able to solve this problem well

Method used

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  • Small current grounding line selection device and control method of voltage disturbance locked line selection
  • Small current grounding line selection device and control method of voltage disturbance locked line selection
  • Small current grounding line selection device and control method of voltage disturbance locked line selection

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Embodiment Construction

[0041] The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] Such as figure 1 As shown, the small current grounding line selection device for voltage disturbance blocking line selection of the utility model is composed of an AC sampling module 1, a signal output module 2, a human-computer interaction module 3, a central processing module 4 and a power supply module 5. After the zero-sequence voltage and zero-sequence current of the system are converted into digital signals by the AC sampling module 1, they are processed by the central processing module 4 to select the fault line or judge the disturbance category, and then the central processing module outputs control signals, and the human The machine module 3 and the signal output module 2 complete the output of the control signal. The power supply module 5 is used for normal power supply to the above modules.

[0043] The AC samplin...

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Abstract

The invention discloses a small current grounding line selection device of voltage disturbance locked line selection. Hardware is composed of an alternating-current sampling module, a signal output module, a man-machine interaction module, a central processing module and a power supply module; a software function module comprises a voltage disturbance detection part and a line selection processing part; the voltage disturbance detection part is used for judging the disturbance type when a disturbance is happened on a system; and the line selection processing part is used for carrying out related fault line selection processing after a single-phase grounding fault is produced on the system. According to the small current grounding line selection device, single-phase grounding and voltage disturbance can be effectively distinguished, so that a false action cannot be generated in the occurrence of the voltage disturbance and a rejecting action cannot be produced in the occurrence of the single-phase grounding.

Description

technical field [0001] The utility model relates to the technical field of electrical equipment manufacturing for power system distribution networks, in particular to a small current grounding line selection device for voltage disturbance blocking line selection. Background technique [0002] Most of the low-voltage distribution networks in my country adopt the neutral point non-effective grounding method. When a single-phase ground fault occurs in this type of power grid, only the capacitive current of the line flows through the ground fault, and its value is only a few amps to 20 or 30 amps. Therefore, This type of grid belongs to the small ground current grid. Since there is no short-circuit current and the line voltage is still symmetrical, it does not affect the normal power supply to users, and it is allowed to continue to run for 1 to 2 hours according to the requirements of the regulations. After a single-phase fault occurs in a small current system, the fault charac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R31/08H02H7/26
Inventor 熊西林张凌苏沛轩黄滇生杨士俊殷咸生胡泽胡祖伟杨文波胡燕玲屈俊宏何永东杨瑾张静芮平李兴美何光树
Owner DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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