A device, method and apparatus for monitoring the position of a protective relay hardboard

Abstract

The application discloses a kind of relay protection hard pressure plate position monitoring device, method and equipment, device includes: the direct current electric field of the wiring between relay protection tripping outlet terminal to hard pressure plate connection terminal is monitored in real time electric field monitoring module, and micro control unit;Electric field monitoring module, for the electric field signal of the direct current electric field of wiring is obtained electric field signal sequence according to sampling frequency N acquisition, electric field signal sequence is sequentially preprocessed and average processing, and the electric field signal average value sequence of containing polarity and size is obtained;Micro control unit, for comparing the continuous M electric field signal average values of electric field signal average value sequence with preset threshold condition respectively, and the hard pressure plate position condition is obtained according to comparison result.Thereby the technical problem that prior art cannot monitor relay protection hard pressure plate position in real time, accurately is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relay protection devices, in particular to a relay protection hard panel position monitoring device, method and equipment. BACKGROUND

[0002] The relay protection hard panel is a mechanical structure installed in the secondary circuit of the substation, which changes the physical on-off state of the circuit by manual operation. It can be generally divided into two types: functional panel and outlet panel. The hard panel is the "switch" of the function of the relay protection device and the on-off of the secondary circuit

[0003] The relay protection hard panel is a manually set secondary circuit disconnect point, which provides great convenience for maintenance and operation, but also adds a step that cannot be completely closed-loop monitored in the relay protection system. The circuit where the relay protection outlet panel is located is a DC 220V or 110V circuit, which is disconnected during normal operation, with no current passing through. At the same time, it is limited by the importance of the relay protection outlet circuit and the management requirements of the circuit safety. Due to the incomplete understanding of the device function by relevant personnel, unfamiliarity with device cooperation, and lack of understanding of the application differences of hard panels by different device manufacturers, device misoperation or refusal to operate accidents caused by misoperation or omission of hard panels occur from time to time, which has a very bad impact on the safe and stable operation of the power grid.

[0004] At present, the technical means for monitoring the hard panel can only monitor the physical on-off position, but in actual operation, the hard panel also exists in the virtual on-off state. For example, due to the aging and falling off of the connection terminal connected to the hard panel, the connection piece of the hard panel is not tightened during the on-off operation process, the hard panel is on the surface, but in fact it is off. Such hidden faults often occur inside the screen cabinet and cannot be observed visually by the running personnel during daily inspection. They are often discovered only after the relay protection refuses to operate during power grid failure, which seriously threatens the safe and reliable operation of the power grid. SUMMARY

[0005] The present application provides a relay protection hard panel position monitoring device, method and equipment, which solves the technical problem that the prior art cannot monitor the relay protection hard panel position in real time and accurately.

[0006] Therefore, the first aspect of the present application provides a relay protection hard panel position monitoring device, which comprises:

[0007] an electric field monitoring module for monitoring the DC electric field of the wiring between the relay protection tripping outlet terminal and the hard panel connection terminal in real time, and a micro control unit;

[0008] The electric field monitoring module is configured to collect electric field signals of the DC electric field of the wiring according to a sampling frequency N to obtain an electric field signal sequence, and sequentially perform preprocessing and average processing on the electric field signal sequence to obtain an electric field signal average value sequence containing polarity and size.

[0009] The micro control unit is configured to compare the continuous M electric field signal average values of the electric field signal average value sequence with preset threshold conditions respectively, and obtain a hard press plate position condition according to a comparison result.

[0010] The DC electric field monitoring module specifically comprises: a charge sensing module using a vibrating capacitance type element or a MEMS electric field sensitive chip, and a preprocessing module with gain amplification.

[0011] The charge sensing module is configured to collect electric field signals of the DC electric field of the wiring according to a sampling frequency N in real time to obtain an electric field signal sequence, and input the electric field signal sequence to the preprocessing module.

[0012] The preprocessing module is configured to amplify each electric field signal of the electric field signal sequence, sort the electric field signals according to amplitude size, and calculate an electric field signal average value sequence containing polarity and size by using a truncated mean calculation method.

[0013] Optionally, the charge sensing module specifically comprises: a shielding electrode, a sensing electrode, and an IU conversion module.

[0014] The shielding electrode has one end grounded, the sensing electrode has one end connected to a first end of the IU conversion module, a second end of the IU conversion module is grounded, and a third end outputs.

[0015] The shielding electrode is driven to generate periodic vibration by using a piezoelectric ceramic or an electrostatic attraction principle, and the shielding electrode is grounded to periodically block the sensing electrode horizontally at a frequency ω, so as to cause periodic change of induced charge amount on the surface of the sensing electrode, thereby generating a weak induced current, and then the I / U conversion module is used to realize current-voltage conversion, so as to output the electric field signal.

[0016] Optionally, the micro control unit is specifically configured to:

[0017] compare the continuous M electric field signal average values of the electric field signal average value sequence with preset threshold conditions respectively;

[0018] when the M electric field signal average values are all one of the preset threshold conditions, it is determined that the hard press plate state is a put-in state;

[0019] when the M electric field signal average values are all not equal to any one of the preset threshold conditions, it is determined that the hard press plate state is a quit state.

[0020] Optionally, the preset threshold condition is +110V and -110V.

[0021] The second aspect of the application provides a method for monitoring the position of a relay protection hard panel, applied to the monitoring device for the position of the relay protection hard panel of the first aspect, and the method comprises:

[0022] A DC electric field signal sequence is obtained by collecting the electric field signal of the DC electric field of the wiring according to the sampling frequency N;

[0023] The electric field signal sequence is sequentially pre-processed and averaged to obtain an electric field signal average value sequence containing polarity and size;

[0024] The continuous M electric field signal average values of the electric field signal average value sequence are compared with the preset threshold condition respectively, and the hard panel position condition is obtained according to the comparison result.

[0025] Optionally, the electric field signal sequence is sequentially pre-processed and averaged to obtain an electric field signal average value sequence containing polarity and size, and specifically comprises:

[0026] After amplifying each electric field signal of the electric field signal sequence, the electric field signals are sorted according to the amplitude size, and the electric field signal average value sequence containing polarity and size is calculated by using the calculation method of the truncated mean.

[0027] Optionally, the continuous M electric field signal average values of the electric field signal average value sequence are compared with the preset threshold condition respectively, and the hard panel position condition is obtained according to the comparison result, and specifically comprises:

[0028] The continuous M electric field signal average values of the electric field signal average value sequence are compared with the preset threshold condition respectively.

[0029] When the M electric field signal average values are all one of the preset threshold conditions, it is determined that the hard panel state is in the input state.

[0030] When the M electric field signal average values are all not equal to any one of the preset threshold conditions, it is determined that the hard panel state is in the exit state.

[0031] Optionally, the preset threshold condition is +110V and -110V.

[0032] The third aspect of the application provides a monitoring device for the position of a relay protection hard panel, and the device comprises a processor and a memory:

[0033] The memory is used for storing program code and transmitting the program code to the processor;

[0034] The processor is configured to execute the steps of the method for monitoring the position of the relay protection hard pressure plate according to the instructions in the program code.

[0035] From the above technical solutions, the present application has the following advantages:

[0036] The present application provides a monitoring device for the position of a relay protection hard pressure plate, a direct current electric field monitoring module for real-time monitoring of the direct current electric field of the wiring between the relay protection tripping outlet terminal and the hard pressure plate connection terminal, and a micro control unit; the electric field monitoring module is configured to collect the electric field signal of the direct current electric field of the wiring according to a sampling frequency N to obtain an electric field signal sequence, and sequentially pre-process and average-process the electric field signal sequence to obtain an electric field signal average value sequence containing polarity and size; the micro control unit is configured to compare the continuous M electric field signal average values of the electric field signal average value sequence with preset threshold conditions respectively, and obtain the hard pressure plate position condition according to the comparison result.

[0037] Compared with the prior art, the present application reliably and safely realizes the reliable monitoring of the position of the relay protection hard pressure plate in the charged state by analyzing the polarity and amplitude characteristics of the electrostatic field of the pressure plate in different charged states (positive, negative, and uncharged), and truly realizes the reliable monitoring of the position of the hard pressure plate. Thus, the technical problem that the prior art cannot monitor the position of the relay protection hard pressure plate in real time and accurately is solved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 Fig. 1 is a structural schematic diagram of a monitoring device for the position of a relay protection hard pressure plate in an embodiment of the present application;

[0039] Figure 2 Fig. 2 is a structural schematic diagram of an electric field monitoring module in an embodiment of the present application;

[0040] Figure 3 Fig. 3 is a flow schematic diagram of a monitoring method for the position of a relay protection hard pressure plate in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to enable personnel in the technical field to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] Please refer to Figure 1 and 2The present application provides a monitoring device for the position of a relay protection hard plate, comprising: a DC electric field monitoring module (e.g., for real-time monitoring of the electric field of the wiring between the relay protection trip output terminal and the hard plate connection terminal) for real-time monitoring of the connection. Figure 1 The electrostatic field sensing module shown includes a probe connected to the relay protection trip output terminal and the connection terminal of the hard plate, as well as a microcontroller unit.

[0043] It should be noted that the energizing characteristics between the relay protection trip output terminal and the hardened pressure plate connection terminal are clearly identifiable under different states in the relay protection tripping and closing circuits. When the hardened pressure plate is in the engaged state, the pressure plate is positively or negatively energized. When the pressure plate is in the disengaged state or in the partially engaged state, the pressure plate is not energized, as shown in the table below:

[0044]

[0045] Therefore, the true location of the relay protection hard plate can be quickly identified by monitoring the strength and polarity of the DC electric field in the wiring between the relay protection trip output terminal and the hard plate connection terminal.

[0046] Specifically, in this embodiment, the DC electric field of the wiring between the relay protection trip output terminal and the hard plate connection terminal is monitored in real time using the probe of the DC electric field monitoring module. Since the outer sheath of the secondary circuit wiring is made of plastic insulation material, the installation of the probe will not affect the secondary circuit of the relay protection. It is safe and reliable, meets the relevant technical management specifications of the power system, and the safety and reliability of the relay protection output circuit are not affected.

[0047] The electric field monitoring module is used to collect the electric field signal of the DC electric field of the connection according to the sampling frequency N to obtain the electric field signal sequence. The electric field signal sequence is preprocessed and averaged in sequence to obtain the average value sequence of the electric field signal including polarity and magnitude.

[0048] It should be noted that the position monitoring of the hard plate only needs to detect which polarity of the DC current is on the plate. There is no requirement for precise measurement of the DC voltage amplitude. Therefore, the DC electric field monitoring only needs to achieve qualitative analysis in circuit design and signal processing, which can greatly reduce the technical specifications requirements of components and the power consumption of sensors.

[0049] A DC electric field monitoring method is used to monitor the DC electric field in real time between the relay protection trip output terminal and the lower terminal of the pressure plate. By monitoring the magnitude and polarity of the DC electric field, the online sensing of the pressure plate's energized state is achieved. The basic principle is described in [link to relevant documentation]. Figure 2 .

[0050] The induction monitoring of the direct current electric field is based on the charge induction principle, and can be selected in two modes of a vibrating capacitance type element or a MEMS electric field sensitive chip. The vibrating capacitance type element generally adopts a piezoelectric ceramic to make the shielding electrode periodically vibrate, and the MEMS electric field sensitive chip generally adopts an electrostatic attraction principle to drive the shielding electrode to periodically vibrate. The measured electric field on the surface of the induction electrode is E, the shielding electrode is grounded to periodically shield the induction electrode horizontally at a frequency omega, to cause the periodic change of the induction charge on the surface of the induction electrode, thereby generating a weak induction current, and then the current voltage conversion is realized by using I / U conversion, and the corresponding direct current electric field detection can be realized by measuring the voltage Vout.

[0051] Specifically, when the voltage signal V out The signal is extremely weak, in order to accurately and quickly demodulate the measured electric field, and avoid the influence of environmental temperature and humidity changes on the demodulation circuit, the gain AC signal amplification circuit and high-speed digital correlation processing technology are used for data processing.

[0052] The micro control unit samples Vout at a sampling frequency N, and performs signal preprocessing, including peak value removal processing of the signal.

[0053] The horizontal movement frequency omega of the shielding electrode is 50 Hz, so the sampling frequency of the micro control unit needs to be at least 1200 Hz, that is, there are 24 sampling points in each horizontal period, and then the root mean square value V samp of the 24 sampling points in each period is taken, and finally 20 sampling points V samp are generated per second.

[0054]

[0055] In order to reduce the influence of extreme value data on the result, the calculation method of truncated mean is adopted, that is, the 20 sampling values V samp are sorted from small to large, the smallest 4 values and the largest 4 values are removed, and then the average of the remaining 12 sampling values is calculated.

[0056]

[0057] The micro control unit is used to compare the continuous M electric field signal average values of the electric field signal average value sequence with the preset threshold condition respectively, and obtain the hard press plate position condition according to the comparison result.

[0058] It should be noted that the signal test of the hard press plate under the conditions of 110V and-110V and the corresponding threshold value are performed before the direct current electric field monitoring module is shipped, and the threshold value is corrected according to the actual wiring condition after the module is installed on site.

[0059] The micro control unit will sample the V out The time sequence is cached in the data queue, and is compared with the set threshold value. When the three consecutive points meet the threshold condition, the current charged state of the hard pressure plate can be obtained, so as to determine that the hard pressure plate is in the input state. If the 110V and-110V charged states do not meet the condition, the hard pressure plate is in the exit state.

[0060] The above is a relay protection hard pressure plate position monitoring device provided in the embodiment of the application, and the above is a relay protection hard pressure plate position monitoring method provided in the embodiment of the application.

[0061] Please refer to Figure 3 The relay protection hard pressure plate position monitoring method provided in the embodiment of the application comprises the following steps:

[0062] Step 201, collecting the electric field signal of the DC electric field of the wiring according to the sampling frequency N to obtain an electric field signal sequence;

[0063] Step 202, sequentially performing preprocessing and average processing on the electric field signal sequence to obtain an electric field signal average value sequence containing polarity and size;

[0064] Step 203, comparing the consecutive M electric field signal average values of the electric field signal average value sequence with the preset threshold condition respectively, and obtaining the hard pressure plate position condition according to the comparison result.

[0065] Further, the embodiment of the application further provides a relay protection hard pressure plate position monitoring device, characterized in that the device comprises a processor and a memory:

[0066] The memory is used for storing program code and transmitting the program code to the processor;

[0067] The processor is used for executing the relay protection hard pressure plate position monitoring method according to the instructions in the program code.

[0068] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described method can refer to the corresponding process in the foregoing device embodiment, which will not be described here.

[0069] The terms "first", "second", "third", "fourth", and the like in the description and in the claims of this application, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of the terms so termed is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of accomplishing functionalities that are either the same or similar to that of other embodiments of the application. Moreover, the terms "include", "have", and the like, are used in the detailed description and in the claims of this application essentially open- ended and are intended to encompass the items listed thereafter, equivalents thereof, as well as additional items not listed after the comma. Finally, terms of degree such as "substantially", "approximately", and the like, are used herein to convey an intended precision or range of values end points of which are known to be subject to, and can have been determined by, typical measurement and manufacturing tolerances as well as other factors or limitations that are expected to be within the scope of one having ordinary skill in the art. Such terms of degree are not intended to exclude the aforementioned absolute precisions and ranges.

[0070] It should be understood that, in the application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the relationship between associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are only A, only B, and A and B at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and back associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0071] In several embodiments provided in the application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic. For example, the division of the units is only a logical function division, and actual implementation can have another division manner. For example, multiple units or components can be combined or integrated into another system, or some features can be omitted or not implemented. In addition, the coupling or direct coupling or communication connection between the displayed or discussed mutual objects can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0072] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0073] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0074] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, essentially or in part, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods according to the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (English full name: Read-Only Memory, English abbreviation: ROM), a random access memory (English full name: Random Access Memory, English abbreviation: RAM), a magnetic disk or an optical disk, and various other media that can store program codes.

[0075] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for monitoring the position of a protective relay hard panel, characterized by, The method comprises the following steps: The electric field monitoring module and the micro control unit are used for monitoring the direct current electric field of the connection between the relay protection tripping outlet terminal and the hard pressure plate connection terminal in real time; The electric field monitoring module is used for collecting the electric field signal of the direct current electric field of the connection according to the sampling frequency N to obtain an electric field signal sequence, and sequentially performing preprocessing and average processing on the electric field signal sequence to obtain an electric field signal average value sequence containing polarity and size; The micro control unit is used for comparing the continuous M electric field signal average values of the electric field signal average value sequence with the preset threshold condition respectively, and obtaining the hard pressure plate position condition according to the comparison result; The direct current electric field monitoring module specifically comprises a charge sensing module using a vibrating capacitance type element or a MEMS electric field sensitive chip, and a preprocessing module with gain amplification; The charge sensing module is used for collecting the electric field signal of the direct current electric field of the connection according to the sampling frequency N in real time to obtain an electric field signal sequence, and inputting the electric field signal sequence into the preprocessing module; The preprocessing module is used for amplifying each electric field signal of the electric field signal sequence, sorting according to the amplitude size, and calculating the electric field signal average value sequence containing polarity and size by using the calculation method of the truncated mean.

2. The apparatus for monitoring the position of a protective relay hard panel according to claim 1, wherein, The charge sensing module specifically comprises a shielding electrode, a sensing electrode and an IU conversion module; One end of the shielding electrode is grounded, one end of the sensing electrode is connected to the first end of the IU conversion module, the second end of the IU conversion module is grounded, and the third end outputs; The shielding electrode is driven to produce periodic vibration by using the piezoelectric ceramic or electrostatic attraction principle, and the shielding electrode is grounded to periodically block the sensing electrode horizontally with a frequency ω, causing the periodic change of the induced charge amount on the surface of the sensing electrode, thereby generating a weak induced current, and then the I / U conversion module is used for current-voltage conversion, thereby outputting the electric field signal.

3. The apparatus for monitoring the position of a protective relay hard panel according to claim 1, wherein, The micro control unit is specifically used for: Comparing the continuous M electric field signal average values of the electric field signal average value sequence with the preset threshold condition respectively; When the M electric field signal average values are all one of the preset threshold conditions, it is determined that the hard pressure plate state is the input state; When the M electric field signal average values are all not equal to any one of the preset threshold conditions, it is determined that the hard pressure plate state is the exit state.

4. The apparatus for monitoring the position of a protective relay hard panel according to claim 1, wherein, The preset threshold condition is +110V and-110V.

5. A method of monitoring the position of a protective relay hardboard, characterized by, The relay protection hard pressure plate position monitoring device and method of any one of claims 1-4, comprising: Collecting the electric field signal of the direct current electric field of the connection according to the sampling frequency N to obtain an electric field signal sequence; Sequentially performing preprocessing and average processing on the electric field signal sequence to obtain an electric field signal average value sequence containing polarity and size; Comparing the continuous M electric field signal average values of the electric field signal average value sequence with the preset threshold condition respectively, and obtaining the hard pressure plate position condition according to the comparison result; The sequentially performing preprocessing and average processing on the electric field signal sequence to obtain an electric field signal average value sequence containing polarity and size specifically comprises: After amplifying each electric field signal of the electric field signal sequence, the electric field signals are sorted according to the magnitude, and the average value sequence of the electric field signals containing polarity and magnitude is calculated by using the calculation method of the truncated mean.

6. The method of claim 5, wherein the relay protection hard panel position is monitored by, The comparison of the continuous M electric field signal average values of the electric field signal average value sequence with the preset threshold condition respectively, and the hard press plate position condition is obtained according to the comparison result, specifically comprising: The comparison of the continuous M electric field signal average values of the electric field signal average value sequence with the preset threshold condition respectively; When the M electric field signal average values are all one of the preset threshold conditions, it is determined that the hard press plate state is the input state; When the M electric field signal average values are all not equal to any one of the preset threshold conditions, it is determined that the hard press plate state is the exit state.

7. The method of claim 5, wherein the relay protection hard panel position is monitored by, The preset threshold condition is +110V and-110V.

8. A device for monitoring the position of a protective hardboard, characterized in that The device comprises a processor and a memory: The memory is used for storing program code and transmitting the program code to the processor; The processor is used for executing the relay protection hard press plate position monitoring method according to the instructions in the program code.

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