阅读说明：本技术 有载分接开关中真空管真空度监测装置方法和监测方法 (Vacuum tube vacuum-degree monitoring device method and monitoring method in load ratio bridging switch ) 是由 李岩 李锁义 穆全儒 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种嵌入式有载分接开关中真空管真空度在线监测方法和装置,装置包括依次级联的感应线圈、信号放大器、滤波器、控制器,控制器用于控制电动机构；控制器通过判定电流波形变化对真空管真空度进行判断,发现电流异常后将停止电动机构,终止有载分接开关的动作。方法包括通过电流波形的变化对真空管真空度的监测的步骤。本发明利适用于各种真空管真空度的监测,它将感应线圈以及引出线全部内置于开关绝缘筒壁内部,不影响开关本体结构以及开关内部的电磁场和温度场,同时绝缘筒壁也可以保护感应线圈和引出线。(The invention discloses vacuum tube vacuum-degree on-line monitoring method and device in a kind of implanted on-load tap changer, device includes that successively cascade induction coil, signal amplifier, filter, controller, controller are used to control motor drive mechanism；Controller judges vacuum tube vacuum-degree by the variation of Cutoff current waveform, will stop motor drive mechanism after finding current anomaly, and terminate the movement of load ratio bridging switch.Method includes the steps that the monitoring by the variation of current waveform to vacuum tube vacuum-degree.Benefit of the invention is suitable for the monitoring of various vacuum tube vacuum-degrees; induction coil and lead-out wire are all built in switch insulation wall inner portion by it; electromagnetic field and the temperature field of Switch main body structure and switch internal are not influenced, while the barrel that insulate also can protect induction coil and lead-out wire.)

1. vacuum tube vacuum-degree monitoring device in a kind of load ratio bridging switch, it is characterised in that: including the successively cascade line of induction Circle, signal amplifier, filter, controller, induction coil are embedded in insulating cylinder, are placed around static contact, and induced flow is used for Cross the electric current of static contact；Controller is changed by the current waveform of judgement filter output judges vacuum tube vacuum-degree, Stop motor drive mechanism in current anomaly, terminates the movement of load ratio bridging switch.

2. a kind of monitoring method for vacuum tube vacuum-degree monitoring device in load ratio bridging switch described in claim 1, It is characterized in that: including the steps that through the variation of detection current waveform come the monitoring to vacuum tube vacuum-degree.

3. the monitoring method of vacuum tube vacuum-degree monitoring device, feature in load ratio bridging switch according to claim 2 It is: judges that the step of current waveform exception is as follows:

Step 1: the current waveform x of record switch motion process, record duration are fixed；The present embodiment is 1s；

Step 2: the current waveform y of the switch motion process of record duration same as current waveform x；

Step 3: the normalized-cross-correlation function of calculating current waveform x and current waveform y, N is waveform points in formula:

Step 4: the normalized-cross-correlation function of current waveform x and current waveform y are greater than preset decision threshold, and vacuum tube is just Often, otherwise vacuum tube is abnormal.

Technical field

The present invention relates to vacuum in a kind of vacuum degree monitoring device and monitoring method more particularly to a kind of load ratio bridging switch Pipe vacuum degree monitoring device and monitoring method belong to on-line monitoring and the early warning technology field of electrical equipment fault.

Background technique

Load ratio bridging switch be the necessary equipment of electric system, it can be achieved that not cutting off load under conditions of adjust voltage, pass Load ratio bridging switch of uniting is mechanical contact.And the load ratio bridging switch of vacuum tube is utilized, the switching of electric arc occurs true In blank pipe, since vacuum contact has connecting-disconnecting function strong, the arcing time is short, and arc voltage is low, and the contact service life is long, does not pollute insulating oil etc. Advantage.Tradition machinery switch contacts are gradually substituted using the vacuum on-load operation switch of vacuum tube.

The vacuum degree that vacuum tube is is to guarantee its premise worked normally, when vacuum degree is lower than 1.33 × 10-5, is needed Replace vacuum tube.The conventional method of vacuum degree measurement is to remove vacuum tube, applies voltage at contact both ends, by measuring ion-conductance Stream judges house vacuum degree.This method needs to disassemble switch, time and effort consuming.

Vacuum pipe shell some at present in vacuum on-load operation switch is for example ceramic for nontransparent insulating materials, therefore Its " a kind of device of non-destructive testing vacuum tube vacuum-degree " for not being available Chinese patent CN105355506A announcement, " a kind of method of laser method optical path difference non-destructive testing vacuum tube vacuum-degree ", the CN105509959A public affairs that CN105513888A is announced A kind of " method of laser method non-destructive testing vacuum tube vacuum-degree " of cloth detects its vacuum degree.

" the vacuum tube vacuum-degree online test method and dress in vacuum on-load operation switch that CN107170639A is announced Set " by detection switch, whether in switching, whether to have arc light normal to detect the vacuum degree of vacuum tube.The program needs Static contact nearby installs light sensing element in switch and subsequent extraction optical fiber, these components are placed on opening for strong-electromagnetic field Portion inside the Pass will affect switch internal magnetic distribution and thermo parameters method, may be to switch while realizing detection function Operation brings risk, and the mode of this open arrangement is it is also possible that sensor itself is influenced by environment.

Summary of the invention

The technical problem to be solved in the present invention is to provide vacuum tube vacuum-degree monitoring device in a kind of load ratio bridging switch and Monitoring method.

In order to solve the above technical problems, the technical solution adopted by the present invention is that:

Technical solution one: vacuum tube vacuum-degree monitoring device in a kind of load ratio bridging switch, including successively cascade induction Coil, signal amplifier, filter, controller, induction coil are embedded in insulating cylinder, are placed around static contact, for incuding Flow through the electric current of static contact；Controller is by determining that vacuum tube vacuum-degree is sentenced in the current waveform variation of filter output It is disconnected, stop motor drive mechanism in current anomaly, terminates the movement of load ratio bridging switch.

Further, signal amplifier, filter and controller are placed in integral box, and integral box is placed in switch top.

Technical solution two: vacuum tube vacuum-degree monitoring method in a kind of load ratio bridging switch, including pass through detection current wave The step of variation of shape carrys out the monitoring to vacuum tube vacuum-degree, judges that the step of current waveform exception is as follows:

Step 1: the current waveform x of record switch motion process, record duration are fixed；

Step 2: the current waveform y of the switch motion process of record duration same as current waveform x；

Step 3: the normalized-cross-correlation function of calculating current waveform x and current waveform y, N is waveform points in formula:

Step 4: the normalized-cross-correlation function of current waveform x and current waveform y are greater than preset decision threshold, vacuum tube Normally, otherwise vacuum tube is abnormal.

Having the technical effect that acquired by by adopting the above technical scheme

1, the present invention utilizes electric current of the induction coil being wound on around static contact to switching when to measure, and passes through The on-line monitoring to vacuum tube vacuum-degree, the monitoring suitable for various vacuum tube vacuum-degrees are realized in the variation of current waveform.

2, induction coil and lead-out wire are all built in switch insulation wall inner portion by the present invention, do not influence Switch main body The electromagnetic field and temperature field of structure and switch internal, while the barrel that insulate also can protect induction coil and lead-out wire.

Detailed description of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is the circuit diagram of load ratio bridging switch；

Fig. 2 is the induction coil connection schematic diagram of the embodiment of the present invention 1；

Fig. 3 is the functional block diagram of the embodiment of the present invention 1；

Fig. 4 is the circuit diagram of the embodiment of the present invention 1.

Specific embodiment