阅读说明：本技术 一种真空度监测装置信号采集回路自检电路及自检方法 (Self-checking circuit and self-checking method for signal acquisition loop of vacuum degree monitoring device ) 是由 张璞 王强 李小康 陈伟奇 牛志雷 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种真空度监测装置信号采集回路自检电路及自检方法,属于电气设备在线监测技术领域,其包括真空度监测装置,以及与真空度监测装置核心处理单元电路连接的自检单元；自检单元包括自检按钮、复位按钮、自检控制继电器、告警控制继电器、光耦、高通滤波回路和灵敏度调节回路,自检按钮和复归按钮均与自检控制继电器连接,自检控制继电器、告警控制继电器、光耦和告警控制模块依次连接,自检控制继电器控制脉冲发生模块发出脉冲信号,脉冲信号经高通滤波回路和灵敏度调节回路进入脉冲计数模块,脉冲计数模块与告警控制模块信号连接。本发明能够验证真空断路器真空度在线监测系统有效性,避免发生误报和漏保,确保供电可靠性。(The invention discloses a self-checking circuit and a self-checking method for a signal acquisition loop of a vacuum degree monitoring device, belonging to the technical field of on-line monitoring of electrical equipment, and comprising a vacuum degree monitoring device and a self-checking unit which is in circuit connection with a core processing unit of the vacuum degree monitoring device; the self-checking unit comprises a self-checking button, a reset button, a self-checking control relay, an alarm control relay, an optical coupler, a high-pass filter circuit and a sensitivity adjusting circuit, wherein the self-checking button and the reset button are both connected with the self-checking control relay, the alarm control relay, the optical coupler and the alarm control module are sequentially connected, the self-checking control relay controls a pulse generation module to send out a pulse signal, the pulse signal enters a pulse counting module through the high-pass filter circuit and the sensitivity adjusting circuit, and the pulse counting module is in signal connection with the alarm control module. The invention can verify the effectiveness of the vacuum degree on-line monitoring system of the vacuum circuit breaker, avoid false alarm and leakage protection and ensure the reliability of power supply.)

1. The utility model provides a vacuum monitoring devices signal acquisition return circuit self-checking circuit which characterized in that: the vacuum degree monitoring device comprises a vacuum degree monitoring device and a self-checking unit which is in circuit connection with a core processing unit of the vacuum degree monitoring device; vacuum monitoring devices core processing unit includes pulse generation module, pulse count module and warning control module, the self-checking unit includes self-checking button, reset button, self-checking control relay, warning control relay, opto-coupler, high pass filter return circuit and sensitivity control circuit, the self-checking button with reset button all with the self-checking control relay is connected, self-checking control relay, warning control relay, opto-coupler and warning control module connects gradually, self-checking control relay control pulse generation module sends pulse signal, and pulse signal warp high pass filter return circuit and sensitivity control circuit get into pulse count module, pulse count module with warning control module signal connection.

2. The vacuum monitoring device signal acquisition loop self-test circuit of claim 1, wherein: the output end of the pulse generation module is connected with a signal selection switch node ZJ3 of the self-checking control relay, and the input end of the pulse generation module is connected with a pulse generation input control node ZJ2 of the self-checking control relay.

3. The vacuum monitoring device signal acquisition loop self-test circuit of claim 2, wherein: the reset button is connected with the input end of the alarm control module.

4. The vacuum monitoring device signal acquisition loop self-test circuit of claim 3, wherein: the alarm control module controls the optical coupler to be connected with a positive power supply of an alarm control relay 24V, so that an alarm control relay node GJ1 is controlled to be closed.

5. The vacuum monitoring device signal acquisition loop self-test circuit of claim 4, wherein: the reset button and the self-checking button are connected with a self-checking lamp through a self-checking control relay node ZJ1, and the alarm control relay node GJ1 is connected with an alarm lamp.

6. The vacuum monitoring device signal acquisition loop self-test circuit of claim 5, wherein: the external terminal D01 of the vacuum degree monitoring device, the self-checking control relay self-checking locking normally closed node ZJ0 and the alarm control relay node GJ2 are sequentially connected with the external terminal D02 of the vacuum degree monitoring device, and the external terminal D03 of the vacuum degree monitoring device is connected with the self-checking control relay self-checking locking normally closed node ZJ 0.

7. The vacuum monitoring device signal acquisition loop self-test circuit of claim 6, wherein: the panel of the vacuum monitoring device is provided with the self-checking button, the resetting button, the running lamp, the self-checking lamp and the warning lamp.

8. A self-checking method for a signal acquisition loop of a vacuum degree monitoring device is characterized by comprising the following steps: the method comprises the following steps: s1, pressing a self-checking button, closing a pulse generation input control node ZJ2 of a self-checking control relay, controlling a core processing unit of the vacuum degree monitoring device to output self-checking high-frequency pulses, simultaneously switching an external signal to an internal self-checking pulse signal sent by a pulse generation module through a self-checking control relay signal selection switch node ZJ3, and controlling a self-checking lamp to light up through a self-checking control relay node ZJ 1;

s2, an internal self-checking pulse signal is input to a signal input end of a pulse counting module of a core processing unit of the vacuum monitoring device through a high-pass filter loop and a sensitivity adjusting loop by selecting a switch node ZJ3 through a self-checking control relay signal;

s3: when the discharging pulse of the internal self-detection pulse signal is monitored to exceed a preset threshold value in a pulse technology monitoring software module 1s of a core processing unit of the vacuum monitoring device, the high-level output signal of the pin is controlled to be output by an alarm control module after 30s of time delay;

s4: the high level output of an alarm control module output pin of a core processing unit of the vacuum degree monitoring device is connected with a 24V positive power supply of an alarm relay through a control optocoupler, so that an alarm relay node GJ1 is controlled to be closed, and self-checking alarm is realized;

s5: and pressing a reset button to reset the warning lamp.

9. The vacuum monitoring device signal acquisition loop self-test method of claim 8, characterized in that: in S1, the self-checking button is pressed down, and the relay is self-checked through the self-checking control to close the normally closed node ZJ0 and close the external terminals D01 and D02 of the vacuum degree monitoring device, so that the self-checking alarm signal is prevented from being sent to the background processing system during operation and maintenance.

Technical Field

The invention relates to the technical field of on-line monitoring of electrical equipment, in particular to a self-checking circuit and a self-checking method for a signal acquisition loop of a vacuum degree monitoring device.

Background

The modern production process of the vacuum circuit breaker can ensure that the vacuum arc-extinguishing chamber has the service life of about 15 years, but because the vacuum arc-extinguishing chamber is possibly doped with impurities in the production materials of the vacuum arc-extinguishing chamber during transportation, use and storage, the reduction of the vacuum degree of the vacuum arc-extinguishing chamber is one of common electrical faults of the vacuum circuit breaker, and the operation safety of a power grid is threatened for a long time. The problem of real-time monitoring of the vacuum degree of a vacuum arc-extinguishing chamber of a medium-voltage vacuum degree circuit breaker is always the hot research of scholars at home and abroad.

The vacuum degree on-line monitoring system of the vacuum circuit breaker designed based on the high-frequency discharge pulse detection principle detects the intensity change of the ground electric field and weak high-frequency pulse discharge signals of the shielding case by a metal plate antenna sensor arranged beside a vacuum arc extinguish chamber, and sends the real-time monitoring signals to a processor for judgment and processing by a shielding coaxial cable, low-frequency filtering, signal amplification and other related circuits. Aiming at the signal perception and intelligent alarm validity of a vacuum degree on-line monitoring unit of a vacuum circuit breaker in the operation process, the self-checking function of a device is required to be designed to realize periodic self-checking, the validity of the vacuum degree on-line monitoring system is ensured, the situations of false reporting and missing protection of the on-line monitoring system are avoided, false reporting signals will disturb operation and maintenance personnel, unnecessary power failure maintenance is caused, the reliability of power supply is influenced, the missing reporting signals cannot effectively reflect the reduction of the vacuum degree of the vacuum circuit breaker, and the effect of the vacuum degree on the on-line monitoring system is lost.

The existing vacuum degree on-line monitoring device of the vacuum circuit breaker does not have a self-checking function, for example, patent document with publication number CN 103413721A discloses a vacuum degree on-line monitoring system of the vacuum circuit breaker, which comprises three-phase vacuum arc-extinguishing chambers, electric field probes for respectively sensing phase angle information of each phase of vacuum arc-extinguishing chamber, and a control circuit connected with the electric field probes, wherein the control circuit performs vector summation on the phase angle information sensed by each electric field probe and then sends the phase angle information to a central control mechanism; patent document with publication number CN 109029837a discloses a vacuum degree monitoring system of a vacuum circuit breaker, which comprises a front end monitoring module, a signal amplifying module, a rectifying and filtering module, a central control module, a fault alarm module, a data setting module, a human-computer interaction interface and a signal transmission module, wherein the front end monitoring module is connected with the vacuum circuit breaker, the front end monitoring module comprises a microwave generating unit, a signal collecting unit and a noise collecting unit, the signal collecting unit is connected with the rectifying and filtering module, the rectifying and filtering module is connected with the central control module, and the central control module is respectively connected with the microwave generating unit, the noise collecting unit, the fault alarm module, the data setting module and the human-computer interaction interface. The vacuum degree monitoring systems of the vacuum circuit breakers disclosed in the two patent documents have no self-checking function, the effectiveness of the vacuum degree on-line monitoring system can not be ensured, and the conditions of false alarm and leakage protection exist, so that the power supply reliability is influenced.

Disclosure of Invention

In view of the above, the invention provides a self-checking circuit and a self-checking method for a vacuum degree monitoring device signal acquisition loop, which can verify the effectiveness of a vacuum degree on-line monitoring system of a vacuum circuit breaker, avoid the occurrence of false alarm and leakage protection of the vacuum degree on-line monitoring system of the vacuum circuit breaker, and ensure the reliability of power supply, aiming at the defects of the prior art.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a self-checking circuit of a signal acquisition loop of a vacuum degree monitoring device comprises the vacuum degree monitoring device and a self-checking unit which is in circuit connection with a core processing unit of the vacuum degree monitoring device; vacuum monitoring devices core processing unit includes pulse generation module, pulse count module and warning control module, the self-checking unit includes self-checking button, reset button, self-checking control relay, warning control relay, opto-coupler, high pass filter return circuit and sensitivity control circuit, the self-checking button with reset button all with the self-checking control relay is connected, self-checking control relay, warning control relay, opto-coupler and warning control module connects gradually, self-checking control relay control pulse generation module sends pulse signal, and pulse signal warp high pass filter return circuit and sensitivity control circuit get into pulse count module, pulse count module with warning control module signal connection.

Further, the output end of the pulse generation module is connected with a signal selection switch node ZJ3 of the self-checking control relay, and the input end of the pulse generation module is connected with a pulse generation input control node ZJ2 of the self-checking control relay.

Furthermore, the reset button is connected with the input end of the alarm control module.

Further, the alarm control module controls the optical coupler to be connected with a positive power supply of the alarm control relay 24V, so that the alarm control relay node GJ1 is controlled to be closed.

Furthermore, the reset button and the self-checking button are connected with a self-checking lamp through a self-checking control relay node ZJ1, and the alarm control relay node GJ1 is connected with an alarm lamp.

Further, a vacuum degree monitoring device external terminal D01, a self-checking control relay self-checking locking normally closed node ZJ0, an alarm control relay node GJ2 and a vacuum degree monitoring device external terminal D02 are sequentially connected, and a vacuum degree monitoring device external terminal D03 is connected with a self-checking control relay self-checking locking normally closed node ZJ 0.

Furthermore, the panel of the vacuum monitoring device is provided with the self-checking button, the resetting button, the running lamp, the self-checking lamp and the warning lamp.

A self-checking method for a signal acquisition loop of a vacuum degree monitoring device comprises the following steps: s1, pressing a self-checking button, closing a pulse generation input control node ZJ2 of a self-checking control relay, controlling a core processing unit of the vacuum degree monitoring device to output self-checking high-frequency pulses, simultaneously switching an external signal to an internal self-checking pulse signal sent by a pulse generation module through a self-checking control relay signal selection switch node ZJ3, and controlling a self-checking lamp to light up through a self-checking control relay node ZJ 1;

s2, an internal self-checking pulse signal is input to a signal input end of a pulse counting module of a core processing unit of the vacuum monitoring device through a high-pass filter loop and a sensitivity adjusting loop by selecting a switch node ZJ3 through a self-checking control relay signal;

s3: when the discharging pulse of the internal self-detection pulse signal is monitored to exceed a preset threshold value in a pulse technology monitoring software module 1s of a core processing unit of the vacuum monitoring device, the high-level output signal of the pin is controlled to be output by an alarm control module after 30s of time delay;

s4: the high level output of an alarm control module output pin of a core processing unit of the vacuum degree monitoring device is connected with a 24V positive power supply of an alarm relay through a control optocoupler, so that an alarm relay node GJ1 is controlled to be closed, and self-checking alarm is realized;

s5: and pressing a reset button to reset the warning lamp.

Furthermore, in S1, the self-checking button is pressed, and the relay is self-checked through the self-checking control to lock the normally closed node ZJ0 and lock the external terminals D01 and D02 of the vacuum degree monitoring device, so that the self-checking alarm signal is prevented from being sent to a background processing system during operation and maintenance.

In the existing power industry, a vacuum degree on-line monitoring device for detecting the vacuum degree of a vacuum circuit breaker is widely applied, the vacuum degree on-line monitoring device detects the intensity change of a ground electric field and a weak high-frequency pulse discharge signal of a shielding cover through a metal polar plate antenna sensor arranged beside a vacuum arc extinguish chamber, relevant loops such as signal amplification and the like send real-time monitoring signals to a processor for judgment and processing through shielding a coaxial cable and low-frequency filtering, the monitoring principle is stable and mature, the existing vacuum degree on-line monitoring device can meet the monitoring requirement, and a person skilled in the art cannot easily think that a self-checking function is additionally added on a set of complete monitoring system.

The existing vacuum degree on-line monitoring device is multi-sided in terms of monitoring convenience and accuracy, for example, a vacuum degree monitoring system of a vacuum circuit breaker disclosed in patent document with publication number CN 109029837a comprises a front-end monitoring module, a signal amplification module, a rectification filtering module, a central control module, a fault alarm module, a data setting module, a man-machine interaction interface and a signal transmission module, wherein the vacuum degree detection of the vacuum circuit breaker can be performed on line, so that the detection cost is greatly saved, the vacuum circuit breaker with the vacuum degree reaching the use offline is maintained and replaced off line in time through real-time monitoring, and the vacuum circuit breaker with the vacuum degree reaching the requirement continues to work, so that a large amount of resources are saved; for another example, patent document with publication number CN103413721 a discloses an online vacuum monitoring system for a vacuum circuit breaker, which includes three-phase vacuum arc-extinguishing chambers, electric field probes for respectively sensing phase angle information of each phase of vacuum arc-extinguishing chamber, and a control circuit connected to the electric field probes, where the control circuit performs vector summation on the phase angle information sensed by each electric field probe and sends the result to a central control mechanism, and performs vector summation on signals of the three probes, and then performs digital filtering through a single chip microcomputer to remove high-frequency harmonics, so that one or two phases of the three-phase vacuum arc-extinguishing chambers can be clearly found to be leaked; the vacuum degree on-line monitoring systems disclosed in the two patent documents both focus on the convenience of monitoring to improve the detection efficiency and ensure the detection timeliness, and the functional self-detection of the vacuum degree monitoring device itself is not easy to think by those skilled in the art.

The vacuum degree on-line monitoring system disclosed by the two patent documents is a complete system consisting of a plurality of modules such as a monitoring module, a processing module, a central control module and an alarm module, the modules are connected with each other through circuits and are connected with each other through signals to form a stable combination, if a self-checking module comprising a plurality of electrical elements is directly added on the basis, the hardware composition of the original monitoring system is not influenced, the self-checking module can be integrated with the original monitoring system, creative labor needs to be paid out, and the vacuum degree on-line monitoring system is difficult to realize by technicians in the field.

Compared with the prior art, the invention has the following beneficial effects:

the invention relates to a self-checking circuit of a signal acquisition circuit of a vacuum degree monitoring device, which realizes the signal input selection control of a core processing unit of the vacuum degree monitoring device by pressing a self-checking button of a panel of the vacuum degree monitoring device and a self-checking control relay, verifies the validity of the signal acquisition circuit and the counting function of a core processing high-frequency discharge pulse by utilizing the closed-loop feedback input of a high-frequency pulse signal generated by the core processing unit to the self signal input end of the core processing unit, and realizes the self-checking function of a system.

In addition, the invention carries out self-checking locking design when designing the alarm outlet loop, wherein the contact of the self-checking control relay is a normally closed contact, when the device carries out self-checking, the self-checking relay acts, the self-checking locking contact ZJ0 of the self-checking relay is opened, and the D01-D02 contact is selected to be connected to other external switching value signal acquisition systems, so that the condition that the alarm signal is wrongly reported due to local self-checking operation can be avoided, and the accuracy of the self-checking result is ensured.

The invention provides a self-checking circuit and a self-checking method for a vacuum degree monitoring device signal acquisition loop, which can realize the self-checking of a system signal acquisition hardware loop and verify the validity of the vacuum degree on-line monitoring system of a vacuum circuit breaker by regularly pressing a device panel self-checking button in the operation process of the vacuum degree on-line monitoring system of the vacuum circuit breaker, thereby avoiding the occurrence of false alarm and leakage protection of the vacuum degree on-line monitoring system of the vacuum circuit breaker and ensuring the reliability of power supply.

Drawings

FIG. 1 is a circuit diagram of a first embodiment of the present invention;

FIG. 2 is a circuit diagram of a second embodiment of the present invention;

FIG. 3 is a schematic view of a panel of a vacuum monitoring device according to a second embodiment of the present invention.

Detailed Description

In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.