CN109521331B - Automatic test system of power distribution network external signal generating device - Google Patents
Automatic test system of power distribution network external signal generating device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses an automatic test system of a power distribution network external signal generating device, which comprises: the test subsystem is connected with the power distribution network external signal generating device; the test subsystem comprises a voltage transformer, a standard power source, an upper computer and a wave recorder; the voltage transformer, the upper computer and the wave recorder are all connected with a power distribution network external signal generating device; the voltage transformer is also connected with a standard power source; the standard power source is also connected with the upper computer; the upper computer is also connected with the wave recorder. The invention can quickly and efficiently realize the function index test of the power distribution network external signal generating device, can decouple the voltage and current loops of the power distribution network external signal generating device, and can realize the automatic execution and automatic detection report of the power distribution network external signal generating device test project by utilizing the upper computer through automatically comparing the voltage and current waveform files and the switch displacement signals of the wave recorder and the power distribution network external signal generating device.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to an automatic test system of a power distribution network external signal generating device.
Background
With the increasing pace of construction and transformation of urban and rural power grids in China, overhead lines and cable lines are continuously increased, and the fault indicator is widely applied to a power distribution network by virtue of a series of advantages of rapidness, accuracy, reliability, capability of loading and unloading with points, automatic reset, no maintenance, great reduction in fault finding, removing and power supply recovery time and the like. The fault indicator adopts the principle of an asymmetric power frequency current injection method, and utilizes the output characteristic signal sequence of the power distribution network applied signal generating device to ensure that the fault indicator can accurately select lines and position and indicate faults when a metallic or high-resistance grounding fault occurs, thereby improving the efficiency of troubleshooting and fault isolation by maintainers.
The power distribution network external signal generating device is generally installed on a transformer substation, an opening and closing station or a feeder outlet line, when a single-phase ground fault occurs on the line, the power distribution network external signal generating device judges the ground fault through zero sequence voltage, when the ground fault lasts for a certain time, the power distribution network external signal generating device automatically switches on and off a switch and generates a characteristic current signal, the signal returns to a signal source through a ground phase, a ground point and the ground of a fault outgoing line, and the signal does not pass through a non-fault outgoing line and a non-fault phase. And when the fault indicator arranged on the line detects a characteristic current signal generated by the power distribution network external signal generating device, the fault indicator carries out on-site turning indication and sends a fault signal to the power distribution automation master station to realize fault positioning.
The functional indexes of the power distribution network external signal generating device determine the accuracy of positioning the ground fault of the power distribution automation system, and the existing testing method is used for testing the functional indexes of the power distribution network external signal generating device by building a 10kV power distribution network true test field, so that the method is huge in cost and low in efficiency.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, an object of the present invention is to provide an automated testing system for a power distribution network applied signal generating device, which can quickly implement a functional index test for the power distribution network applied signal generating device.
The invention aims to realize the technical scheme that an automatic test system of a power distribution network external signal generating device comprises: the system comprises a test subsystem and a power distribution network external signal generating device, wherein the test subsystem is connected with the power distribution network external signal generating device;
the test subsystem comprises a voltage transformer, a standard power source, an upper computer and a wave recorder; the voltage transformer, the upper computer and the wave recorder are all connected with a power distribution network external signal generating device;
the voltage transformer is also connected with the standard power source and used for boosting an output voltage signal of the standard power source and inputting the boosted signal to the power distribution network external signal generating device;
the standard power source is also connected with the upper computer;
the upper computer is also connected with the wave recorder; the upper computer collects voltage, current signals and switch position signals through the wave recorder, and automatically compares and analyzes the voltage, current waveform files and switch position signals uploaded by the power distribution network external application signal generating device to determine the functional indexes of the power distribution network external application signal generating device.
Furthermore, the voltage loop and the current loop of the power distribution network external signal generation device are decoupled.
And furthermore, the auxiliary contact of the three-phase switch of the signal generating device applied outside the power distribution network is connected in parallel, then is connected with the analog resistor in series and then is connected with single-phase power frequency alternating current, and a cable of a current loop passes through a current transformer of the signal generating device applied outside the power distribution network.
Further, the method also comprises the following steps: the output voltage signal of the standard power source is boosted to 10kV through the voltage transformer and then input to a high-voltage pile head of the power distribution network external application signal generating device, the working ground of the power distribution network external application signal generating device is suspended, and the power distribution network external application signal generating device sends the acquired voltage signal to a control unit of the power distribution network external application signal generating device.
Further, the upper computer obtains a wave recording file and a remote signaling deflection signal of the power distribution network external signal generating device through an 101/104 protocol.
Further, the upper computer also controls the standard power source to output three-phase voltage signals to the voltage transformer.
Due to the adoption of the technical scheme, the invention has the following advantages: the invention can quickly and efficiently realize the function index test of the power distribution network externally applied signal generating device, can decouple the voltage and current loops of the power distribution network externally applied signal generating device, adopts AC 220V as an external power supply in a test environment, and does not need to build a 10kV power distribution network true test field; the test case can be flexibly edited by using the upper computer, and the externally applied signal generating device of the power distribution network can be comprehensively tested; the upper computer can be used for automatically comparing voltage and current waveform files and switch displacement signals of the wave recorder and the power distribution network external signal generating device, so that automatic execution and automatic issuing of a detection report of a power distribution network single-phase earth fault positioning test project are realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings of the invention are illustrated as follows:
fig. 1 is a block diagram of an automated testing system for an external signal generating device of a power distribution network.
Fig. 2 is a schematic diagram of a voltage testing loop of an automatic testing system of a power distribution network applied signal generating device.
Fig. 3 is a schematic diagram of a current test loop of an automatic test system of a power distribution network applied signal generating device.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example, as shown in fig. 1; an automatic test system of a power distribution network external signal generating device comprises: the system comprises a test subsystem and a power distribution network external signal generating device, wherein the test subsystem is connected with the power distribution network external signal generating device;
the test subsystem comprises a voltage transformer, a standard power source, an upper computer and a wave recorder; the voltage transformer, the upper computer and the wave recorder are all connected with a power distribution network external signal generating device;
the voltage transformer is also connected with the standard power source and used for boosting an output voltage signal of the standard power source and inputting the boosted signal to the power distribution network external signal generating device;
the standard power source is also connected with the upper computer;
the upper computer is also connected with the wave recorder; the upper computer collects voltage, current signals and switch position signals through the wave recorder, and automatically compares and analyzes the voltage, current waveform files and switch position signals uploaded by the power distribution network external application signal generating device to determine the functional indexes of the power distribution network external application signal generating device.
Decoupling voltage and current loops of the power distribution network external signal generation device; the upper computer controls the standard power source to output three-phase voltage signals to the voltage transformer, and the three-phase voltage signals are connected to a high-voltage pile head of the power distribution network external application signal generating device after being boosted;
auxiliary contacts of a three-phase switch of the power distribution network external signal generating device are connected in parallel, then are connected with the analog resistor in series and then are connected with single-phase power frequency alternating current, and a cable of a current loop passes through a current transformer of the power distribution network external signal generating device;
the upper computer collects voltage, current signals and switch position signals through the wave recorder, and automatically compares and analyzes the voltage, current waveform files and switch position signals uploaded by the power distribution network external application signal generating device to determine the functional indexes of the power distribution network external application signal generating device.
The wave recorder collects voltage and current signals output by the testing subsystem and switch position signals of the power distribution network external signal generating device;
the upper computer is connected with the wave recorder through a network to obtain a waveform file of voltage and current signals and a switch deflection signal; the power distribution network external signal generating device also collects voltage and current signals and switch position signals,
the upper computer obtains a wave recording file and a remote signaling deflection signal of the power distribution network external signal generating device through 101/104 protocols;
the upper computer determines whether the power distribution network external signal generating device acts correctly or whether the locking and sampling precision meet the requirements or not by automatically comparing voltage and current waveform files and switch displacement signals of the wave recorder and the power distribution network external signal generating device.
As shown in fig. 2, after the output voltage signal of the standard power source is boosted to 10kV by the voltage transformer, the boosted voltage signal is input to the high-voltage pile head of the external application signal generating device of the power distribution network, the working ground of the external application signal generating device of the power distribution network is suspended, and the external application signal generating device of the power distribution network sends the acquired voltage signal to the control unit of the external application signal generating device of the power distribution network;
as shown in fig. 3, the head end and the tail end of the auxiliary contact of the three-phase switch of the power distribution network applied signal generating device are respectively connected in parallel, and are connected with the analog resistor in series to be connected with single-phase power frequency alternating current, and after the cable of the current loop passes through the current transformer of the power distribution network applied signal generating device, the power distribution network applied signal generating device sends the acquired current signal to the control unit of the power distribution network applied signal generating device.
The invention has the following beneficial effects: the function index test of the power distribution network externally applied signal generating device can be quickly and efficiently realized, the voltage and current loops of the power distribution network externally applied signal generating device can be decoupled, an external power supply in a test environment adopts AC 220V, and a 10kV power distribution network true test field does not need to be built; the test case can be flexibly edited by using the upper computer, and the externally applied signal generating device of the power distribution network can be comprehensively tested; the upper computer can be used for automatically comparing voltage and current waveform files and switch displacement signals of the wave recorder and the power distribution network externally applied signal generating device, so that automatic execution and automatic issuing of a detection report of a test project of the power distribution network externally applied signal generating device are realized.
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.
Claims (5)
1. An automatic test system of a power distribution network applied signal generating device is characterized in that the test system comprises a test subsystem and the power distribution network applied signal generating device, wherein the test subsystem is connected with the power distribution network applied signal generating device;
the test subsystem comprises a voltage transformer, a standard power source, an upper computer and a wave recorder; the voltage transformer, the upper computer and the wave recorder are all connected with a power distribution network external signal generating device;
the voltage transformer is also connected with the standard power source and used for boosting an output voltage signal of the standard power source and inputting the boosted signal to the power distribution network external signal generating device;
the standard power source is also connected with the upper computer;
the upper computer is also connected with the wave recorder; the upper computer collects voltage, current signals and switch position signals through a wave recorder, and automatically compares and analyzes the voltage, current waveform files and switch position signals uploaded by the power distribution network external application signal generating device to determine functional indexes of the power distribution network external application signal generating device;
the output voltage signal of the standard power source is boosted to 10kV through the voltage transformer and then input to a high-voltage pile head of the power distribution network external application signal generating device, the working ground of the power distribution network external application signal generating device is suspended, and the power distribution network external application signal generating device sends the acquired voltage signal to a control unit of the power distribution network external application signal generating device.
2. The system of claim 1, further comprising decoupling the voltage loop and the current loop of the power distribution network applied signal generating device.
3. The system for automatically testing the external signal generating device of the power distribution network according to claim 1, further comprising a current transformer which connects the auxiliary contacts of the three-phase switch of the external signal generating device of the power distribution network in parallel, then connects the auxiliary contacts in series with the analog resistor, then connects the single-phase power-frequency alternating current, and passes a cable of the current loop through the external signal generating device of the power distribution network.
4. The automatic test system for the external signal generating device of the power distribution network according to claim 1, wherein the upper computer obtains the wave recording file and the remote signaling deflection signal of the external signal generating device of the power distribution network through 101/104 protocols.
5. The automated testing system for the external signal generating device of the power distribution network according to claim 1, wherein the upper computer further controls the standard power source to output a three-phase voltage signal to the voltage transformer.
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| CN110441652A (en) * | 2019-07-25 | 2019-11-12 | 北京三清互联科技有限公司 | It is a kind of highly sensitive outer to apply signal type fault location system and method |
| CN110780156A (en) * | 2019-11-13 | 2020-02-11 | 国网山西省电力公司电力科学研究院 | Detection system of external signal generation device |
| CN114152838A (en) * | 2021-11-17 | 2022-03-08 | 上海欣影电力科技股份有限公司 | High-voltage virtual power source three-phase loop detection control box |
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