Self-supply microprocessor protection device with current trip

A microcomputer protection device and self-power supply technology, which is applied in the direction of emergency protection circuit device, circuit device, emergency power supply protection, etc., can solve the problems of secondary side voltage instability, secondary voltage phase loss, and wire voltage loss, etc., to avoid The effect of protecting failure, reducing project cost and ensuring stability

Pending Publication Date: 2019-05-21
宁波东海自动控制设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some 10KV small and medium-sized distribution transformers, box transformers, and ring network power distribution equipment do not use DC power screens as working power sources due to small space constraints and investment savings, but directly use 10KV busbar voltage transformers to directly step down to AC 220V as The working power of the device
If the AC220V power supply loses power or is unstable, it will affect the reliability of the system protection equipment
Although the AC working power supply is economical, convenient and practical, the stability and reliability of the power supply cannot be guaranteed. When the voltage transformer fuse is blown, it will cause the secondary voltage phase loss, power loss or line voltage drop, etc., especially when the system has a large Power supply accidents (such as 10KV bus short circuit, phase-to-phase short circuit and near-point short circuit accidents), will cause the system 10KV bus voltage to drop, the secondary side voltage of PT is unstable, and the AC220V working power supply voltage value sometimes drops to 50%. Below, the protection of secondary protection equipment such as microcomputer devices will fail due to low working power, which will not be effective and the faulty line will be cut off.

Method used

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  • Self-supply microprocessor protection device with current trip
  • Self-supply microprocessor protection device with current trip
  • Self-supply microprocessor protection device with current trip

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Embodiment Construction

[0014] The invention will be further described below with reference to the accompanying drawings and in combination with specific embodiments, so that those skilled in the art can implement it by referring to the description, and the protection scope of the present invention is not limited to the specific embodiments.

[0015] The self-powered microcomputer protection device involved in the present invention, on the one hand, has the overcurrent protection, quick break protection, overload protection, zero sequence current protection, overvoltage protection, undervoltage protection and non- Power, gas, temperature protection and other technical functions; on the other hand, when the working power supply of the system is too low or loses working power, especially in serious accidents such as line load or bus phase short circuit, near point short circuit, etc., the system bus voltage drops to 50%. And below, the original conventional protection loses its effect because the workin...

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Abstract

The invention relates to a self-supply microprocessor protection device. The self-supply microprocessor protection device comprises a CT sampling loop, wherein the CT sampling loop comprises an A-phase CT sampling loop, the A-phase CT sampling loop comprises a current transformer 2LHa, a current transformer CTa and a switch connection point JA2, the switch connection point JA2 is connected in series with the current transformers, the A-phase CT sampling loop also comprises an A-phase transducer Ta and an overcurrent trip protection circuit, the overcurrent trip protection circuit is connectedin parallel with the switch connection point JA2, the overcurrent trip protection circuit comprises an overcurrent tripper Y7 and a switch connection point JA1, the switch connection point JA1 is connected in series with the overcurrent tripper Y7. When a short-circuit accident occurs in a power supply system, the A-phase transducer Ta is used for acquiring current energy of the short-circuit accident and converting to the microprocessor protection device for power supply, so that the microprocessor protection device can normally work, the accident is detected and distinguished, a protection action command is started, a power-grid fault point is removed, and protection failure of the microprocessor protection device caused by excessively low voltage of an external working power supply or power failure is prevented.

Description

technical field [0001] The invention relates to the technical field of microcomputer protection, in particular to a self-powered microcomputer protection device with current tripping. Background technique [0002] In the power system industry, the protection, measurement and control of high-voltage substation equipment with a power supply load greater than 400KVA capacity are realized by microcomputer protection devices in substations with a voltage level of 10KV and above. Among them, the 10KV switching stations under the jurisdiction of the State Grid and the substation equipment with a voltage level of 35KV and above are equipped with a special DC power supply panel (DC110V or DC220V) as the working power supply of the microcomputer protection device and switchgear, but in some small-scale 10KV Distribution transformers, box transformers, and ring network power distribution equipment do not use DC power panels as the working power supply due to limited space and investmen...

Claims

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Application Information

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IPC IPC(8): H02H1/06H02H7/26H02H7/22H02J50/10H02J5/00
Inventor 梁辉峰俞世杰乐雷明
Owner 宁波东海自动控制设备有限公司
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