An online positioning system for latent faults of analog secondary N lines in relay protection

Abstract

The present invention provides an online locating system for potential faults in analog secondary N lines of relay protection, comprising two microswitches and a fault detector. The two microswitches are embedded in the cavity of a terminal block, and their operating buttons are respectively located near the line inlet and the line outlet. A signal source in the fault detector is connected to the male pins of the two microswitches, and a signal receiving circuit is connected to the normally closed contacts on the two microswitches. After the secondary N line is connected to the incoming line, if the operating button of the incoming microswitch is pressed to interrupt the forwarding of the electrical signal, the signal receiving circuit determines that the incoming line connection is normal; otherwise, it is abnormal. After the secondary N line is connected to the outgoing line, if the operating button of the outgoing microswitch is pressed to interrupt the forwarding of the electrical signal, the signal receiving circuit determines that the outgoing line connection is normal; otherwise, it is abnormal. Implementing the present invention can accurately locate potential faults in analog secondary N lines of relay protection, which is not only low-cost but also time- and labor-saving.

Description

Technical Field

[0001] The present invention relates to the technical field of relay protection monitoring, and in particular to an online positioning system for potential faults of analog secondary N lines of relay protection. Background Art

[0002] After long-term operation, the analog secondary neutral line of the relay protection system is susceptible to various factors, including insulation aging, non-standard terminal structure, and incorrect wiring. These factors can easily lead to faults such as inadequate wiring, poor contact, and loose connections, which can cause secondary voltage deviations in the power grid system and cause widespread power outages. However, these faults are difficult to detect under normal conditions. The main reason is that the analog secondary neutral line of the relay protection system has no operating current, making fault detection difficult and time-consuming.

[0003] Extensive on-site research has revealed that faults in the analog secondary N line of relay protection are primarily caused by latent faults such as poor contact and loose wiring after long-term operation due to improper terminal structure. However, there is no effective solution for these latent faults, requiring only post-accident power outages and extensive manual search to identify them. This is not only costly but also inaccurate. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide an online positioning system for latent faults of analog secondary N lines of relay protection, which can accurately locate latent faults of analog secondary N lines of relay protection, is not only low-cost, but also saves time and effort.

[0005] In order to solve the above technical problems, the embodiment of the present invention provides an online positioning system for potential faults of analog secondary N line of relay protection, comprising two micro switches and a fault detector; wherein,

[0006] The two micro switches are embedded in a cavity preset in a corresponding terminal block of the analog secondary N line of the relay protection; a through hole for the insertion of an electrical conductor is provided in the middle of the cavity, and its two ends are respectively connected to the input and output ports preset in the same terminal block; the operating button of one of the two micro switches is located near the input port, and the operating button of the other is located near the output port;

[0007] The fault detector is provided with a signal source and a signal receiving circuit; wherein the signal source is connected to the preset male pins of the two micro switches via an electrical conductor, and is used to periodically generate and transmit an electrical signal; the signal receiving circuit is connected to the preset normally closed contacts of the two micro switches via an electrical conductor, and is used to periodically receive the electrical signals forwarded by the two micro switches, and judge whether the wiring status of the secondary N-line input and output of the relay protection analog quantity is normal based on the electrical signals received in each period;

[0008] After the relay protection analog secondary N-line incoming line is connected, if the operating button of the micro switch in the direction of the incoming line is pressed to interrupt the corresponding electrical signal forwarding, the signal receiving circuit will determine that the wiring state of the relay protection analog secondary N-line incoming line is normal; otherwise, the signal receiving circuit will determine that the wiring state of the relay protection analog secondary N-line incoming line is abnormal;

[0009] After the relay protection analog secondary N-line outlet is connected, if the operating button of the microswitch in the direction of the outlet is pressed to interrupt the corresponding electrical signal forwarding, the signal receiving circuit will determine that the wiring status of the relay protection analog secondary N-line outlet is normal; otherwise, the signal receiving circuit will determine that the wiring status of the relay protection analog secondary N-line outlet is abnormal.

[0010] The signal receiving circuit uses light or sound to give an alarm to indicate that the connection status of the relay protection analog secondary N line input and output is abnormal.

[0011] Wherein, the signal source is a PWM signal source.

[0012] Among them, it also includes: remote monitoring equipment;

[0013] The remote monitoring device is connected to the fault detector and is used to receive the judgment result of the signal receiving circuit in the fault detector.

[0014] The implementation of the embodiments of the present invention has the following beneficial effects:

[0015] After the relay protection analog secondary N line input and output are connected, the present invention uses a fault detector to identify whether the electrical signal in the input and output direction is interrupted to quickly locate whether the wiring status of the relay protection analog secondary N line input and output is normal, thereby accurately locating the latent fault of the relay protection analog secondary N line, which is not only low-cost but also time-saving and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0017] Figure 1 A connection structure diagram of an online location system for latent faults of analog secondary N lines of relay protection provided by an embodiment of the present invention after installation on a single wiring terminal;

[0018] Figure 2 for Figure 1 The structure diagram of a single micro switch before being pressed;

[0019] Figure 3 for Figure 1 The structure diagram after a single micro switch is pressed;

[0020] Figure 4 for Figure 1 Schematic diagram of the logical structure connection of the fault detector;

[0021] Figure 5 A working principle diagram of two micro switches and a fault detector before the operating button is pressed in an online locating system for latent faults of analog secondary N line of relay protection provided by an embodiment of the present invention;

[0022] Figure 6 This is a working principle diagram of two micro switches and a fault detector after the operating button is pressed in an online positioning system for latent faults of analog secondary N line of relay protection provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 6 As shown in the figure, an online positioning system for potential faults of analog secondary N line of relay protection proposed in an embodiment of the present invention comprises two micro switches 1 and a fault detector 2; wherein,

[0025] The two micro switches 1 include an operating button, a spring, a hook, a moving reed, a male pin, a normally closed contact and a normally open contact (such as Figure 2 and 3 As shown in FIG2 , the two micro switches 1 are embedded in a cavity K preset in a terminal S corresponding to the secondary N line of the analog relay protection; a through hole s1 is provided in the middle of the cavity K for the insertion of an electrical conductor, and its two ends are respectively connected to the input port IN and the output port OUT preset in the same terminal; at this time, the operating button of one of the two micro switches 1 is set near the input port IN, and the operating button of the other is set near the output port OUT;

[0026] The fault detector 2 is provided with a signal source 21 (such as a PWM signal source) and a signal receiving circuit 22 (such as a Figure 4As shown); wherein, the signal source 21 is connected to the preset male pins of the two micro switches 1 through an electrical conductor (for example, passing through the through hole s1), and is used to periodically (for example, once every 2 seconds) generate and transmit an electrical signal; the signal receiving circuit 22 is connected to the preset normally closed contacts of the two micro switches 1 through an electrical conductor (for example, passing through the through hole s1), and is used to periodically (for example, once every 2 seconds) receive the electrical signals forwarded by the two micro switches 1, and judge whether the connection status of the relay protection analog secondary N line input line L1 and output line L2 is normal based on the electrical signals received in each period;

[0027] Among them, after the relay protection analog secondary N line incoming line L1 is connected (that is, the incoming line terminal is connected and fixed by screw G), if the operating button of the micro switch 1 in the direction of the incoming line IN is pressed to interrupt the corresponding electrical signal forwarding, the signal receiving circuit 2 will no longer be able to receive the electrical signal in the direction of the incoming line IN and will determine that the wiring state of the relay protection analog secondary N line incoming line L1 is normal, that is, the incoming line L1 is in place; on the contrary, if the operating button of the micro switch 1 in the direction of the incoming line IN cannot be pressed to interrupt the corresponding electrical signal forwarding, the signal receiving circuit 2 will always be able to receive the electrical signal in the direction of the incoming line IN and will determine that the wiring state of the relay protection analog secondary N line incoming line L1 is abnormal, that is, the incoming line L1 is not in place;

[0028] Similarly, after the relay protection analog secondary N line output L2 is connected (that is, the output terminal is connected and fixed by screws), if the operating button of the micro switch 1 in the direction of the outlet OUT is pressed to interrupt the corresponding electrical signal forwarding, the signal receiving circuit 2 will no longer be able to receive the electrical signal in the direction of the outlet OUT and will determine that the wiring status of the relay protection analog secondary N line output is normal, that is, the output line L2 is in place; conversely, if the operating button of the micro switch 1 in the direction of the outlet OUT cannot be pressed to interrupt the corresponding electrical signal forwarding, the signal receiving circuit will determine that the wiring status of the relay protection analog secondary N line output is abnormal because it can always receive the electrical signal in the direction of the outlet OUT, that is, the output line L2 is not in place.

[0029] It is understandable that, in view of the large number of wiring terminals S in actual applications, the number of micro switches 1 can be configured according to the actual number of wiring terminals S. In this case, each wiring terminal S needs to be configured with two micro switches 1, and all micro switches 1 are connected to the fault detector 2 through electrical conductors (for details, please refer to the wiring method of the two micro switches 1 mentioned above). Based on the multi-path logic judgment channels pre-set in the signal receiving circuit 2 in the fault detector 2, the on-off state of the electrical signal after each micro switch 1 is operated is used to judge whether the wiring state of the input and output lines on each wiring terminal S is normal. The logic judgment process of each logic judgment channel can be specifically referred to the logic judgment principle for the two micro switches 1 mentioned above, and will not be repeated here.

[0030] It should be noted that the two micro switches 1 in each terminal S can be designed with structural deformation (such as a miniature limiter with a similar structure, etc.), or can be designed with an integrated structure (such as two elastic contacts, two elastic components, two male pins, two normally closed contacts, etc. integrated on the main body), which will not be described in detail here.

[0031] In this embodiment of the present invention, the signal receiving circuit 2 includes not only a signal receiving module but also an alarm module. This alarm module can generate a light or sound alarm to indicate abnormal wiring conditions of the relay protection analog secondary N-line input L1 and output L2. It should be noted that the specific structure of the signal receiving circuit 2, including the signal receiving module and the alarm module, can be designed or adjusted based on actual applications and will not be further described here.

[0032] In an embodiment of the present invention, the online positioning system for latent faults of the relay protection analog secondary N line also includes: a remote monitoring device 3; wherein the remote monitoring device 3 is connected to the fault detector 2, and is used to receive the judgment result of the signal receiving circuit 22 in the fault detector 2, so that the wiring status of the relay protection analog secondary N line input and output on each terminal can be monitored in real time.

[0033] The implementation of the embodiments of the present invention has the following beneficial effects:

[0034] After the relay protection analog secondary N line input and output are connected, the present invention uses a fault detector to identify whether the electrical signal in the input and output direction is interrupted to quickly locate whether the wiring status of the relay protection analog secondary N line input and output is normal, thereby accurately locating the latent fault of the relay protection analog secondary N line, which is not only low-cost but also time-saving and labor-saving.

[0035] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An online positioning system for potential faults of analog secondary N lines of relay protection, characterized in that: It includes two micro switches and a fault detector; The two micro switches are embedded in a cavity preset in a corresponding terminal block of the analog secondary N line of the relay protection; a through hole for the insertion of an electrical conductor is provided in the middle of the cavity, and its two ends are respectively connected to the input and output ports preset in the same terminal block; the operating button of one of the two micro switches is located near the input port, and the operating button of the other is located near the output port; The fault detector is provided with a signal source and a signal receiving circuit; wherein the signal source is connected to the preset male pins of the two micro switches via an electrical conductor, and is used to periodically generate and transmit an electrical signal; the signal receiving circuit is connected to the preset normally closed contacts of the two micro switches via an electrical conductor, and is used to periodically receive the electrical signals forwarded by the two micro switches, and judge whether the wiring status of the secondary N-line input and output of the relay protection analog quantity is normal based on the electrical signals received in each period; After the relay protection analog secondary N-line incoming line is connected, if the operating button of the micro switch in the direction of the incoming line is pressed to interrupt the corresponding electrical signal forwarding, the signal receiving circuit will determine that the wiring state of the relay protection analog secondary N-line incoming line is normal; otherwise, the signal receiving circuit will determine that the wiring state of the relay protection analog secondary N-line incoming line is abnormal; After the relay protection analog secondary N-line outlet is connected, if the operating button of the microswitch in the direction of the outlet is pressed to interrupt the corresponding electrical signal forwarding, the signal receiving circuit will determine that the wiring status of the relay protection analog secondary N-line outlet is normal; otherwise, the signal receiving circuit will determine that the wiring status of the relay protection analog secondary N-line outlet is abnormal.

2. The online positioning system for potential faults of analog secondary N lines of relay protection according to claim 1, characterized in that: The signal receiving circuit uses light or sound to give an alarm to prompt that the connection status of the relay protection analog secondary N line input and output lines is abnormal.

3. The online positioning system for potential faults of analog secondary N lines of relay protection according to claim 1, characterized in that: The signal source is a PWM signal source.

4. The online positioning system for potential faults of analog secondary N lines of relay protection according to claim 1, characterized in that: Also included: remote monitoring equipment; The remote monitoring device is connected to the fault detector and is used to receive the judgment result of the signal receiving circuit in the fault detector.

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