阅读说明：本技术 一种开关柜绝缘劣化气体检测系统及方法 (Switch cabinet insulation degradation gas detection system and method ) 是由 毕海涛 鲁旭臣 许傲然 高阳 李爽 李泽曦 刘佳鑫 杨鹤 汪宇 刘博� 郎业兴 于 2020-11-08 设计创作，主要内容包括：本发明属于绝缘劣化气体检测技术领域,尤其涉及一种开关柜绝缘劣化气体检测系统及方法。本发明系统是由流量传感器、管道、连接线缆、进样装置、检测单元、数据采集装置、处理单元、通讯装置、预警装置及控制箱组成。本发明基于对开关柜绝缘劣化气体进行检测,通过监测开关柜内部气体分解组分含量、产气速率的变化,进而监测开关柜内部放电情况和绝缘状态,并充分考虑开关柜通风散热等情况下产生空气流通的影响,对气体组分检测结果进行校正,大大提高了对开关柜内部放电情况和绝缘状态判断的准确度,可以更加准确地了解和掌握开关柜内部绝缘缺陷类型的性质和特征,从而为确定开关柜发生的绝缘劣化类型和位置提供参考依据。(The invention belongs to the technical field of insulation deterioration gas detection, and particularly relates to a switch cabinet insulation deterioration gas detection system and method. The system of the invention consists of a flow sensor, a pipeline, a connecting cable, a sample feeding device, a detection unit, a data acquisition device, a processing unit, a communication device, an early warning device and a control box. The invention is based on the detection of the insulation deterioration gas of the switch cabinet, monitors the discharge condition and the insulation state in the switch cabinet by monitoring the content of the decomposition components of the gas in the switch cabinet and the change of the gas production rate, fully considers the influence of air circulation generated under the conditions of ventilation and heat dissipation of the switch cabinet and the like, and corrects the detection result of the gas components, thereby greatly improving the accuracy of judging the discharge condition and the insulation state in the switch cabinet, more accurately knowing and mastering the property and the characteristic of the insulation defect type in the switch cabinet and further providing a reference basis for determining the insulation deterioration type and the position of the switch cabinet.)

1. The utility model provides a cubical switchboard insulation degradation gas detection system, includes the cubical switchboard, characterized by: an air inlet (3) and an air outlet (2) are arranged on the switch cabinet (1); the flow sensor 4 is connected with the air outlet (2) and is connected with a data acquisition device (9) in the control box (13) through a cable (6); a pipeline (5) is led out from the air outlet (2), and the other end of the pipeline (5) extends into a sample injection device (7); a sample introduction device (7), a detection unit (8), a processing unit (10), a communication device (11) and an early warning device (12) are arranged in the control box (13) and are sequentially connected through a cable, and the early warning device (12) is also connected with the processing unit (10) through the cable; the processing unit (10) is also connected with a data acquisition device (9) through a cable, and the data acquisition device (9) is connected with the flow sensor (4) through a cable.

2. The system according to claim 1, wherein the insulation degradation gas detection system comprises: the air inlet (3) is arranged below one side of the switch cabinet (1), and the air outlet (2) is arranged above the other side of the switch cabinet (1).

3. The system according to claim 1, wherein the insulation degradation gas detection system comprises: the detection unit (8) detects the gas components and concentration, is connected with the processing unit (10) through a cable, and sends the detected data to the processing unit (10).

4. The system according to claim 1, wherein the insulation degradation gas detection system comprises: the flow sensor (4) detects the air ventilation quantity and transmits the air ventilation quantity to the data acquisition device (9).

5. The system according to claim 1, wherein the insulation degradation gas detection system comprises: the data acquisition device (9) processes the ventilation quantity, and establishes a ventilation quantity-time corresponding relation model for the processing unit (10) to call.

6. The system according to claim 1, wherein the insulation degradation gas detection system comprises: the processing unit (10) is used for carrying out characteristic screening on gas components and concentration, calling a ventilation quantity-time relation model for correction, comparing the model with an existing standard relation model, evaluating the switch cabinet, finding potential insulation degradation hazards and sending an early warning signal to the early warning device (12).

7. The system according to claim 1, wherein the insulation degradation gas detection system comprises: the processing unit (10) is connected with the communication device (11) through a cable, and the communication device (11) is used for transmitting information to the centralized control center in real time.

8. The system according to claim 1, wherein the insulation degradation gas detection system comprises: the early warning device (12) is connected with the processing unit (10) through a cable, receives an early warning signal of the processing unit (10) and gives an alarm.

9. A method for detecting insulation degradation gas of a switch cabinet is characterized by comprising the following steps: the method comprises the following steps:

step 1, conveying mixed gas in a switch cabinet to a detection unit by using a sample introduction device; detecting gas flow by using a flow sensor, processing the gas flow by using a data acquisition device, and establishing a ventilation volume-time corresponding relation model;

step 2, the detection unit detects the mixed gas, detects the component type and concentration of the mixed gas and sends the component type and concentration to the processing unit;

step 3, the processing unit processes the components, calculates the concentration and the gas production rate of the components, calls a ventilation volume-time corresponding relation model and corrects the concentration and the property right rate of the components;

step 4, the processing unit performs characteristic screening according to the result of the component correction, compares the result with a standard relation model of insulation degradation, and evaluates the switch cabinet;

and 5, after the processing unit finds the potential insulation degradation hazard, sending an early warning signal to an early warning device for warning, and reporting to a centralized control center through a communication device.

10. A computer storage medium, characterized by: the computer storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of a method for detecting insulation degrading gases of a switchgear cabinet according to claims 1-9.

Technical Field

The invention belongs to the technical field of insulation degradation detection, and particularly relates to a switch cabinet insulation degradation gas detection system and method.

Background

The switch cabinet is one of key main equipment of an electric power system, has the advantages of safety, reliability, compact structure, occupied land conservation, convenience in operation and the like, plays a role in control or protection in the power transmission and distribution process, and has a great influence on the reliability of the electric power system. Various insulation defects are inevitably generated in the processes of manufacturing, distribution, installation, operation, maintenance and the like of the switch cabinet, and if the insulation defects cannot be found as soon as possible and developed, the electric field distortion of the switch cabinet in the operation is easily caused, the partial discharge is induced, the production accident is finally caused, and the huge economic loss and the negative social influence are brought to power generation enterprises.

During partial discharges, the insulating medium generates specific gases, such as nitrogen-containing compounds, sulfur compounds, CO, O₃And the components, concentration, gas production rate and the like of the generated gas are closely related to the partial discharge condition, the partial discharge characteristics caused by different types of insulation defects are obviously different, and further the decomposition characteristics of the air under the partial discharge action of the different types of insulation defects are obviously different, so that the insulation state of the switch cabinet can be reflected. Therefore, the gas in the switch cabinet is subjected to component detection, the decomposition characteristics of the discharge components are analyzed to reflect the discharge condition in the switch cabinet, and the insulation state of the switch cabinet is monitored so as to take measures and prevent malignant accidents.

However, the existing gas component detection technologies, such as infrared spectrum detection technology, electrochemical sensor detection technology, etc., only pay attention to the detection of gas components, and do not consider the influence of air circulation generated under the conditions of ventilation and heat dissipation of the switch cabinet, etc., the air circulation can dilute the concentration of gas generated due to partial discharge, and the calculated gas generation rate is also low, so that the judgment of the discharge condition inside the switch cabinet and the insulation state of the monitoring switch cabinet can be influenced finally.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a switch cabinet insulation degradation gas detection system and method, aiming at realizing more accurate detection of gas generated by a switch cabinet under insulation degradation, so that the property and the characteristic of the insulation defect type in the switch cabinet can be more accurately known and mastered, and a reference basis is provided for determining the insulation degradation type and position of the switch cabinet.

The technical scheme adopted by the invention for realizing the purpose is as follows:

a switch cabinet insulation deterioration gas detection system comprises a switch cabinet, wherein an air inlet and an air outlet are formed in the switch cabinet; the flow sensor 4 is connected with the air outlet and is connected with a data acquisition device in the control box through a cable; leading out a pipeline from the air outlet, wherein the other end of the pipeline extends into the sample injection device; the control box is internally provided with a sample feeding device, a detection unit, a processing unit, a communication device and an early warning device which are sequentially connected through a cable, and the early warning device is also connected with the processing unit through the cable; the processing unit is also connected with a data acquisition device through a cable, and the data acquisition device is connected with the flow sensor through a cable.

The air inlet is arranged below one side of the switch cabinet, and the air outlet is arranged above the other side of the switch cabinet.

The detection unit detects gas components and concentration of the gas, is connected with the processing unit through a cable, and sends detected data to the processing unit.

The flow sensor detects air ventilation and transmits the air ventilation to the data acquisition device.

The data acquisition device processes the ventilation quantity, and establishes a ventilation quantity-time corresponding relation model for the processing unit to call.

The processing unit is used for screening characteristics of gas components and concentration, calling a ventilation quantity-time relation model for correction, comparing the corrected characteristics with an existing standard relation model, evaluating the switch cabinet, finding potential insulation degradation hazards and sending an early warning signal to the early warning device.

The processing unit is connected with the communication device through a cable, and the communication device is used for transmitting information to the centralized control center in real time.

The early warning device is connected with the processing unit through a cable, receives an early warning signal of the processing unit and gives an alarm.

A detection method for insulation degradation gas of a switch cabinet comprises the following steps:

step 1, conveying mixed gas in a switch cabinet to a detection unit by using a sample introduction device; detecting gas flow by using a flow sensor, processing the gas flow by using a data acquisition device, and establishing a ventilation volume-time corresponding relation model;

step 2, the detection unit detects the mixed gas, detects the component type and concentration of the mixed gas and sends the component type and concentration to the processing unit;

step 3, the processing unit processes the components, calculates the concentration and the gas production rate of the components, calls a ventilation volume-time corresponding relation model and corrects the concentration and the property right rate of the components;

step 4, the processing unit performs characteristic screening according to the result of the component correction, compares the result with a standard relation model of insulation degradation, and evaluates the switch cabinet;

and 5, after the processing unit finds the potential insulation degradation hazard, sending an early warning signal to an early warning device for warning, and reporting to a centralized control center through a communication device.

A computer storage medium having a computer program stored thereon, the computer program when executed by a processor implementing the steps of a method for detecting insulation degrading gas of a switchgear.

The invention has the following beneficial effects and advantages:

the invention is based on the detection of gas components in the switch cabinet, monitors the discharge condition and the insulation state in the switch cabinet by monitoring the content of gas decomposition components and the change of gas production rate in the switch cabinet, fully considers the influence of air circulation generated under the conditions of ventilation and heat dissipation of the switch cabinet and the like, corrects the detection result of the gas components, greatly improves the accuracy of judging the discharge condition and the insulation state in the switch cabinet, and is more suitable for detecting the deterioration of the insulation performance state caused by the gradual development of partial discharge faults of equipment.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a block diagram of the insulation deterioration gas detection system of the switch cabinet of the present invention;

FIG. 2 is a layout view of the insulation deterioration gas detection system of the switchgear of the present invention;

FIG. 3 is a flow chart of the insulation degradation gas detection system of the switch cabinet of the present invention;

FIG. 4 is a diagram of the layout and electrical connections of the equipment in the control box of the present invention.

In the figure:

switch cabinet 1, air exit 2, air intake 3, flow sensor 4, pipeline 5, cable 6, sampling device 7, detecting element 8, data acquisition device 9, processing unit 10, communication device 11, early warning device 12, control box 13.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The solution of some embodiments of the invention is described below with reference to fig. 1-4.

Example 1

The invention discloses a switch cabinet insulation deterioration gas detection system and a method, wherein the detection system is shown as figure 1, and figure 1 is a structural block diagram of the switch cabinet insulation deterioration gas detection system.

The system mainly comprises a sample introduction device 7, a detection unit 8, a processing unit 10, an early warning device 12, a flow sensor 4, a data acquisition device 9, a communication device 11, a pipeline, a cable and the like.

The sample introduction device quantitatively sends gas in the switch to the detection unit;

the detection unit can be obtained by adopting an infrared spectrum detection technology and an electrochemical sensor detection technology and is used for detecting gas components and concentration;

the flow sensor 4 may be an ultrasonic flowmeter or the like, and is used for detecting the flow rate of the ventilation air;

the data acquisition device establishes a ventilation volume-time corresponding relation model according to the received data of the flow sensor;

the processing unit is used for carrying out characteristic screening on gas components and concentration, calling a ventilation quantity-time relation model for correction, calculating a gas production rate, comparing the gas production rate with an existing standard relation model, evaluating the switch cabinet, finding potential insulation degradation hazards, sending an early warning signal to an early warning device and reporting the early warning signal to a centralized control center;

the communication device can adopt one or more modes of RS232 communication, optical fiber communication, wireless communication, GPRS communication and Beidou communication to realize the communication between the processing unit and the centralized control center.

The pipeline is used for connecting the sample feeding device with the switch cabinet;

the lines are used for electrical connections between parts of the system.

As shown in fig. 2, fig. 2 is a layout diagram of the insulation deterioration gas detection system of the switch cabinet of the present invention.

The system comprises a switch cabinet 1, an air outlet 2, an air inlet 3, a flow sensor 4, a pipeline 5, a cable 6, a sample introduction device 7, a detection unit 8, a data acquisition device 9, a processing unit 10, a communication device 11, an early warning device 12 and a control box 13.

An air inlet 3 and an air outlet 2 are arranged on the switch cabinet 1. The air inlet 3 is specifically arranged below one side of the switch cabinet 1, and the air outlet 2 is specifically arranged above the other side of the switch cabinet 1.

Further, the flow sensor 4 is arranged at the air outlet 2 and is connected with the data acquisition device 9 in the control box 13 through a cable 6.

The installation position of the flow sensor 4 has no special requirement, as long as the gas flow can be detected, and the connection installation mode can select a general technology, such as installation through bolts.

All have connecting terminal on flow sensor 4 and the data acquisition device 9, the cable is received on connecting terminal can.

Air exit 2 department fixedly connected with pipeline 5, the gas of extraction air exit 2 department, during the other end of pipeline 5 extended to sampling device 7 in the control box 13, realized the gas sampling in the cubical switchboard 1, sampling device 7 was again with the gaseous detecting element 8 of giving in the control box 1 of gathering.

The fixing mode of the pipeline 5 and the exhaust outlet 2 can be any of various existing connecting modes, such as welding, bolt connection and the like.

The sample introduction device 7 is provided with an interface, and the connection mode of the pipeline 5 and the interface adopts the prior general technology.

Fig. 4 is a diagram showing the layout and electrical connections of the equipment in the control box according to the present invention, as shown in fig. 4.

The control box 13 is internally provided with a sample introduction device 7, a detection unit 8, a processing unit 10, a communication device 11 and an early warning device 12 which are sequentially connected through cables, and the early warning device 12 is also connected with the processing unit 10 through a cable and is connected to a terminal through a cable; the processing unit 10 is also connected with the data acquisition device 9 through a cable, and the data acquisition device 9 is connected with the flow sensor 4 through a cable.

The detection unit 8 detects gas components and concentrations of the gas, is connected to the processing unit 10 through a cable, and transmits detected data to the processing unit 10.

The flow sensor 4 detects the air ventilation and transmits it to the data acquisition device 9.

The data acquisition device 9 processes the ventilation volume, and establishes a ventilation volume-time corresponding relation model for the processing unit 10 to call.

And establishing a standard relation model of the components, the concentrations of the components, the gas production rate and the insulation deterioration of the switch cabinet of the insulation deterioration associated gas based on the test data, the structural characteristics of the switch cabinet and the typical fault case.

The processing unit 10 performs characteristic screening on gas components and concentration, calls a ventilation-time relation model for correction, compares the corrected model with an existing standard relation model, evaluates the switch cabinet, finds potential insulation degradation hazards, and sends an early warning signal to the early warning device 12.

The processing unit 10 is connected with the communication device 11 through a cable, and information is transmitted to the centralized control center in real time through the communication device 11.

The early warning device 12 is connected with the processing unit 10 through a cable, receives the early warning signal of the processing unit 10, and gives an alarm.

When the invention is implemented, the volume inside the switch cabinet is set as V:

at time t1, when the concentration of the insulation-degrading gas was measured to be C1, the volume of the degrading gas in the switch Q1,

Q1=V x C1；

at time t2, when the concentration of the insulation-degrading gas was measured to be C2, the volume of the degrading gas in the switch Q2,

Q2=V x C2。

correcting the concentration of the deteriorated gas:

the ventilation rate in the period from t1 to t2 is Q, the switch cabinet sucks in external fresh air from the air inlet, and mixed gas in the switch cabinet is exhausted from the air outlet, at a certain moment, the influence of the ventilation rate on the concentration of the degraded gas in the switch cabinet is small, and for convenience of calculation, if the concentration of the degraded gas is not changed, the switch cabinet exhausts the degraded gas of Q x C1 due to the influence of ventilation;

the concentration C of the insulation-degrading gas at time t2 if there is no influence of the ventilation;

C=[Q2+(C1 x Q)]÷V；

gas production rate gamma;

γ=[Q2+(C1 x Q)]÷（t2-t1）。

example 2

The invention further provides an embodiment of a method for detecting insulation degradation gas of a switch cabinet, as shown in fig. 3, and fig. 3 is a flowchart of a system for detecting insulation degradation gas of a switch cabinet according to the invention.

The invention comprises the following steps:

step 1, conveying mixed gas in a switch cabinet to a detection unit by using a sample introduction device; detecting gas flow by using a flow sensor, processing the gas flow by using a data acquisition device, and establishing a ventilation volume-time corresponding relation model;

step 2, the detection unit detects the mixed gas, detects the component type, the concentration and the like of the mixed gas and sends the component type, the concentration and the like to the processing unit;

step 3, the processing unit processes the components, calculates the concentration and the gas production rate of the components, calls a ventilation volume-time corresponding relation model and corrects the concentration and the property right rate of the components;

step 4, the processing unit performs characteristic screening according to the result of the component correction, compares the result with a standard relation model of insulation degradation, and evaluates the switch cabinet;

and 5, after the processing unit finds the potential insulation degradation hazard, sending an early warning signal to an early warning device for warning, and reporting to a centralized control center through a communication device.

Example 3

Based on the same inventive concept, an embodiment of the present invention further provides a computer storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the method for detecting insulation degradation gas in a switch cabinet according to embodiment 1 or 2 are implemented.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.