Method for detecting output pulse width precision of automation and protection equipment
阅读说明：本技术 一种用于自动化及保护设备开出脉宽精度检测方法 (Method for detecting output pulse width precision of automation and protection equipment ) 是由 董兴顺 张子龙 刘世忠 陈鹏 綦少龙 李丰羽 谢文祥 丛文博 栾德燕 潘璇 于 2019-11-13 设计创作，主要内容包括：本发明属于工业技术领域,尤其涉及一种用于自动化及保护设备开出脉宽精度检测方法,应用于自动化装置、继电保护设备开展定期检查及校验工作。本发明包括测试电脑、现地控制单元LCU、端配板及继电保护或安全自动装置；其中,测试电脑1与现地控制单元LCU的一端相连接,现地控制单元LCU的另一端与端配板相连接,端配板的另一端与继电保护或安全自动装置相连接。本发明在保证测量精度的同时,减少了设备购置及维护成本费用,提高了现场检验工作效率及经济性。同时接线方式简单,不会对被校验设备进行上电及操作,不存在误动作行为。还具有接线简单、工作量少、检测结果可以直接对比,便于装置开出脉宽的质量评价的优点。(The invention belongs to the technical field of industry, and particularly relates to a pulse width precision detection method for automation and protection equipment, which is applied to the development of periodic inspection and verification work of automation devices and relay protection equipment. The invention comprises a testing computer, a local control unit LCU, an end distribution board and a relay protection or safety automatic device; the testing computer 1 is connected with one end of a local control unit LCU, the other end of the local control unit LCU is connected with an end distribution board, and the other end of the end distribution board is connected with a relay protection or safety automatic device. The invention reduces the cost of equipment purchase and maintenance while ensuring the measurement precision, and improves the working efficiency and the economical efficiency of field inspection. Meanwhile, the wiring mode is simple, the device to be checked cannot be electrified and operated, and misoperation does not exist. The method also has the advantages of simple wiring, less workload, direct comparison of detection results and convenience for quality evaluation of the pulse width of the device.)
1. A method for detecting the pulse width precision of an automatic and protective device is characterized by comprising the following steps: comprises a testing computer, a local control unit LCU, an end distribution board and a relay protection or safety automatic device; the testing computer 1 is connected with one end of a local control unit LCU, the other end of the local control unit LCU is connected with an end distribution board, and the other end of the end distribution board is connected with a relay protection or safety automatic device.
2. The method as claimed in claim 1, wherein the method comprises the following steps: the testing computer is connected with the local control unit LCU through a connecting line, the other end of the local control unit LCU is connected with the end distribution board through a connecting line, and the other end of the end distribution board is connected with a relay protection or safety automatic device through a connecting line.
3. The method as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following steps:
step 1, selecting a Local Control Unit (LCU) of a monitoring system, selecting an SOE board card channel needing to be subjected to pulse width verification, and accessing a pulse outgoing channel of a detected device to an SOE board card of the LCU through a signal cable;
step 2, leading out a signal by using a signal cable at a position of a channel terminal opened by the detected device, and accessing the other end of the signal cable into a selected SOE board card measuring channel;
step 3, accessing a testing computer at the LCU of the local control unit of the monitoring system, opening debugging software and selecting an SOE event list;
step 4, controlling the actual action of the detected device, issuing a pulse width signal, checking the twice deflection time of the pulse signal in a debugging software 'SOE event list', and calculating the time difference of the twice deflection time to obtain the actual precision of the pulse width;
and 5, comparing the calculated time difference of the two displacements, namely the actual precision of the pulse width with the set pulse width of the device, evaluating whether the precision of the pulse width signal meets the requirement or not, and recording.
4. The method as claimed in claim 3, wherein the method comprises the following steps: and if the detected device simultaneously performs the output pulse width verification of a plurality of devices, selecting a plurality of channels.
5. The method as claimed in claim 3, wherein the method comprises the following steps: and when the other end of the signal cable is connected to the selected SOE board card measuring channel, the signal cable is directly connected without distinguishing polarities.
6. The method as claimed in claim 3, wherein the method comprises the following steps: the signal cable is selected within the range of 1mm2- 1.5 mm2。
Technical Field
The invention belongs to the technical field of industry, and particularly relates to a pulse width precision detection method for automation and protection equipment, which is applied to the development of periodic inspection and verification work of automation devices and relay protection equipment.
Background
According to the power industry standard, the hydropower station field automation device and the relay protection equipment need to carry out device verification work regularly according to actual operation conditions, and pulse signal width detection of the device is an important detection item, and is used for determining whether the pulse width of the device is matched with the field equipment action control logic or not and whether the device can reliably drive external equipment to correctly act according to the set logic within the pulse width range or not. At present, the detection of pulse width of an automatic device and relay protection equipment on site still depends on a relay protection tester, although the measurement precision of the type of the instrument is higher, the purchase price is also higher, a professional testing unit needs to be entrusted regularly to check the detection precision of the instrument, the maintenance cost is higher, and the overall application economy is lower.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a pulse width precision detection method for automation and protection equipment, aiming at carrying out pulse width precision detection by using an SOE board card configured by a Local Control Unit (LCU) of a hydropower station monitoring system on the premise of ensuring the measurement precision without using similar detection equipment such as a relay protection tester and the like, wherein the SOE board card is configured for analyzing the accident occurrence sequence of the hydropower station, and the detection precision can reach millisecond level so as to rapidly judge the sequence of accident signals.
In order to achieve the above object, the present invention is achieved by the following technical solutions:
a pulse width precision detection method for automation and protection equipment comprises a test computer, a Local Control Unit (LCU), an end distribution board and a relay protection or safety automatic device; the
The testing computer is connected with the local control unit LCU through a connecting line, the other end of the local control unit LCU is connected with the end distribution board through a connecting line, and the other end of the end distribution board is connected with a relay protection or safety automatic device through a connecting line.
The method for detecting the pulse width precision of the automation and protection equipment comprises the following steps:
and 5, comparing the calculated time difference of the two displacements, namely the actual precision of the pulse width with the set pulse width of the device, evaluating whether the precision of the pulse width signal meets the requirement or not, and recording.
And if the detected device simultaneously performs the output pulse width verification of a plurality of devices, selecting a plurality of channels.
Furthermore, when a signal cable is used for leading out a signal at a channel terminal of the detected device and the other end of the signal cable is connected to the selected SOE board card measuring channel, the signal cable is directly connected without distinguishing polarity.
The signal cable is selected within the range of 1mm2- 1.5 mm2。
The invention has the advantages and beneficial effects that:
the detection method adopted by the invention has a simple principle, reduces the cost for purchasing and maintaining equipment while ensuring the measurement precision, and improves the working efficiency and the economical efficiency of field inspection. The test instrument is not required to be purchased, only the equipment necessary on the site is used for detection, and the cost performance is high.
The invention has simple wiring mode, does not electrify and operate the checked equipment and does not have misoperation.
The invention adopts the SOE board card configured by the local control unit LCU for detection, the detection precision can reach millisecond level, and the requirement of the verification precision is met.
After the SOE board card is connected once, the front-end detection equipment can be replaced at will, frequent disconnection is not needed, and compared with the connection of a test instrument, the front-end detection equipment is simple in connection and low in workload.
The pulse width value measured by the SOE board card is displayed in real time in a table form, multiple output pulse width detection can be carried out on the same interface, the detection results can be directly compared, and the quality evaluation of the output pulse width of the device is facilitated.
Drawings
In order to facilitate the understanding and practice of the present invention for those of ordinary skill in the art, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and the detailed description, the following examples are provided to illustrate the present invention, but it should be understood that the scope of the present invention is not limited by the detailed description.
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a schematic diagram of the connection of an SOE board card with an end distribution board after the SOE board card is installed in a PLC plug-in box according to the present invention;
FIG. 3 is a schematic diagram of the present invention using debug software to look up the device outgoing pulse signal shifts.
In the figure: the system comprises a
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a pulse width precision detection method for automation and protection equipment, which is applied to the development of periodic inspection and verification work of automation devices and relay protection equipment.
As shown in fig. 1, fig. 1 is a schematic view of the general structure of the present invention. The invention is characterized in that a
The invention discloses a method for detecting the pulse width precision of an automation and protection device, which comprises the following steps:
1. selecting a set of LCU of the on-site control unit of the monitoring system, selecting an SOE board card channel which needs to be subjected to pulse width verification, and accessing a pulse output channel of a detected device to an SOE board card of the LCU of the on-site control unit through a signal cable; if the output pulse width of a plurality of devices is checked at the same time, a plurality of channels are selected;
2. leading out a signal by using a signal cable at a channel terminal opened by a detected device, and accessing the other end of the signal cable into a selected SOE board card measuring channel without distinguishing polarity, wherein the signal can be directly accessed;
the signal cable can be selected within 1mm2- 1.5 mm2The signal cable of (1). In practice, 1mm is usually selected2A signal cable.
3. Accessing a
4. controlling the actual action of the detected device, issuing a pulse width signal, checking the two-time displacement time of the pulse signal in a debugging software SOE event list, calculating the two-time displacement time difference to be the actual precision of the pulse width, comparing the actual precision with the issued pulse width set in the device, evaluating whether the precision of the pulse width signal meets the requirement, and recording.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
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