阅读说明：本技术 一种可靠性高的绝缘状态评估装置 (A kind of Condition assessment of insulation device of high reliablity ) 是由 何雪梅 于 2018-05-23 设计创作，主要内容包括：本发明公开了一种可靠性高的绝缘状态评估装置,包括：用于连接在电缆上以产生冲击电压的冲击电压发生器；用于采集电缆上的冲击电压和冲击电流的数据采集装置；根据冲击电压、冲击电流计算等效冲击电阻值以对电缆绝缘状态进行判断的分析装置；所述分析装置的电源输入端连接有接口保护电路。通过在监测电缆中出现的过电压和瞬变电流,从等效冲击电阻值来判断其绝缘状况,实现对电缆绝缘状态的评估,它可以监测到低电压下无法暴露的缺陷,从而保证电力电缆的安全、可靠运行。在分析装置的电源输入端连接有接口保护电路,提高设备的可靠性。(The invention discloses a kind of Condition assessment of insulation devices of high reliablity, comprising: for being connected to the impulse voltage generator for generating surge voltage on cable；For acquiring the data acquisition device of surge voltage and dash current on cable；Analytical equipment of the equivalent impulse resistance value to be judged cable insulation status is calculated according to surge voltage, dash current；The power input of the analytical equipment is connected with interface protective circuit.Pass through the overvoltage and transient current occurred in monitoring cable, its insulation status is judged from equivalent impulse resistance value, realize the assessment to cable insulation status, it can monitor the defect that can not be exposed under low-voltage, to guarantee the safe and reliable operation of power cable.It is connected with interface protective circuit in the power input of analytical equipment, improves the reliability of equipment.)

1. a kind of Condition assessment of insulation device of high reliablity characterized by comprising

For being connected to the impulse voltage generator for generating surge voltage on cable；

For acquiring the data acquisition device of surge voltage and dash current on cable；

The analysis dress for calculating equivalent impulse resistance value according to surge voltage, dash current to be judged cable insulation status It sets；

The power input of the analytical equipment is connected with interface protective circuit.

2. a kind of Condition assessment of insulation device of high reliablity according to claim 1, which is characterized in that the interface is protected Protection circuit triode T1, the collector of the triode T1 are connected on power port by inductance L1, the power end It is connected with resistance R3 between mouth and the base stage of triode T1, the emitter of triode T1 is connected to the ground by resistance R1, described Capacitor C2 is parallel on resistance R1, the emitter of the triode T1 is connected in the base stage of triode T2 by resistance R2, The emitter of the triode T2 is connected to the ground by resistance R4, and the collector of the triode T2 is connected to triode T1 Base stage on, the base stage of the triode T1 is connected on the cathode of diode D1 by resistance R5, the diode D1 Anode be connected to the ground by inductance L2, the anode of the diode D1 is connected on the cathode of diode D3 simultaneously, described The anode of diode D3 be connected on the anode of diode D2, the cathode of the diode D2 is connected to the base of triode T1 On extremely, the anode of the diode D2 is connected to the ground by capacitor C3.

Technical field

The present invention relates to power system insulation monitoring technical fields, and in particular to a kind of Condition assessment of insulation of high reliablity Device.

Background technique

In recent years, cable rate increases sharply in urban distribution network, but with the increase of running time, these early investments are transported Capable cable aging is increasingly severe, it is most likely that dielectric breakdown accident occurs.In order to reduce the generation of insulation fault, it is necessary to The accurate state of insulation for grasping cable is realized before accident generation and is given warning in advance.It is more representative both at home and abroad at present Cable insulation status online evaluation method includes DC superposition method, tan δ method, AC superimposition method, the low frequency addition method, harmonic component Method, shelf depreciation method, polarization-depolarising method.The company, Tokyo Electric Power of Japan and Hitachi cable companies joint development calculus of finite differences For detection cable local discharge signal；Chinese patent CN201410150614.8 " supervise online by a kind of XLPE cable shelf depreciation Survey method " obtains the real-time local discharge signal on the ground wire of corresponding XLPE cable to be measured by sensor, at filtering It saves after reason in the database, history of forming Partial Discharge Data, then the history voltage data is divided through expert system Characteristic parameter is extracted in analysis, forms characteristic spectrum, finally obtains the dielectric level of cable.

The effects such as sound, the heat generated for cable local discharge, and produce a variety of partial discharge monitoring methods.In State patent CN201010571501.7 " crosslinking polyethylene-insulated cable insulation ageing management system " passes through ultrahigh frequency monitoring module and sound Launch monitor module respectively detects the high-frequency signal and sound wave of XLPE cable and attached shelf depreciation.

But above-mentioned detection method haves the defects that certain, for example: certain defects of cable are likely difficult to expose, and Extraneous various factors interference is highly prone in measurement process at the scene, then the insulation parameter measured is difficult to accurately reflect the true of insulation Real state.

Summary of the invention

In order to solve the above-mentioned technical problem the present invention provides a kind of Condition assessment of insulation device of high reliablity.

The present invention is achieved through the following technical solutions:

A kind of Condition assessment of insulation device of high reliablity, comprising:

For being connected to the impulse voltage generator for generating surge voltage on cable；

For acquiring the data acquisition device of surge voltage and dash current on cable；

Analysis of the equivalent impulse resistance value to be judged cable insulation status is calculated according to surge voltage, dash current Device；

The power input of the analytical equipment is connected with interface protective circuit.

The interface protective circuit triode T1, the collector of the triode T1 are connected to power end by inductance L1 On mouth, resistance R3 is connected between the power port and the base stage of triode T1, the emitter of triode T1 passes through resistance R1 is connected to the ground, and capacitor C2 is parallel on the resistance R1, and the emitter of the triode T1 is connected to by resistance R2 In the base stage of triode T2, the emitter of the triode T2 is connected to the ground by resistance R4, the collection of the triode T2 Electrode is connected in the base stage of triode T1, and the base stage of the triode T1 is connected to the cathode of diode D1 by resistance R5 On, the anode of the diode D1 is connected to the ground by inductance L2, and the anode of the diode D1 is connected to two poles simultaneously On the cathode of pipe D3, the anode of the diode D3 is connected on the anode of diode D2, the cathode of the diode D2 It is connected in the base stage of triode T1, the anode of the diode D2 is connected to the ground by capacitor C3.

By the overvoltage and transient current occurred in monitoring cable, its shape that insulate is judged from equivalent impulse resistance value Condition realizes the assessment to cable insulation status, it can monitor the defect that can not be exposed under low-voltage, to guarantee electric power electricity The safe and reliable operation of cable.It is connected with interface protective circuit in the power input of analytical equipment, improves the reliability of equipment.

Compared with prior art, the present invention having the following advantages and benefits:

1, the present invention is judged by the overvoltage and transient current that occur in monitoring cable from equivalent impulse resistance value Its insulation status realizes the assessment to cable insulation status, it can monitor the defect that can not be exposed under low-voltage, to protect Demonstrate,prove the safe and reliable operation of power cable.It is connected with interface protective circuit in the power input of analytical equipment, improves equipment Reliability.

Specific embodiment

To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment, the present invention is made Further to be described in detail, exemplary embodiment of the invention and its explanation for explaining only the invention, are not intended as to this The restriction of invention.