Primary equipment state line protection tripping circuit online monitoring method and system

Abstract

The invention discloses an online monitoring method and system for a line protection tripping circuit of a primary equipment state, and relates to the technical field of monitoring and protection of the state of an electric power system and equipment of the electric power system, and the method comprises the steps: determining a line operation state through employing interval data collected by a collection system; line operation state judgment is carried out by utilizing line voltage judgment, line current judgment, line transmission power judgment, circuit breaker position state judgment and isolation switch position judgment, and when the line operation state is in a normal state and a hot standby state, the state of a tripping loop is judged. The abnormal state of the pressing plate is alarmed; according to the method, alarm reasons of'control loop disconnection 'are distinguished, and abnormal points are positioned as an internal loop or an external loop of the device, so that on-site operation and maintenance personnel are supported, fault points are quickly found, faults are eliminated, and on-line monitoring and automatic judgment of the operation state of primary equipment are realized.

Description

Technical Field

[0001] This invention relates to the technical field of power system and equipment condition monitoring and protection, specifically to a method and system for online monitoring of line protection tripping circuits of primary equipment. Background Technology

[0002] When a fault occurs in a power grid transmission line, the line protection device's tripping circuit energizes the tripping coil, causing the relevant primary equipment mechanism to operate and disconnect the circuit breaker to isolate the fault. If the tripping circuit malfunctions and causes the circuit breaker to fail to trip, it can lead to cascading tripping of the power grid, expanding the fault area, and in severe cases, causing grid oscillations or even grid disconnection, resulting in a large-scale power outage. Therefore, it is essential to ensure that the tripping circuit is functioning properly to reliably isolate the fault.

[0003] Current technologies primarily involve connecting a closing position relay (HWJ) in series with the tripping circuit. The normally closed contacts of the HWJ form an alarm circuit, issuing a "control circuit disconnection" alarm signal in case of an anomaly. This allows for monitoring of the tripping circuit's status. Patent application CN116207854A proposes a method and system for online monitoring of the integrity of relay protection output circuits. By acquiring information on the circuit breaker's open / close position and changes in the electrostatic field polarity of the terminal block under the tripping circuit output pressure plate, the connection status of the circuit breaker's control circuit can be determined.

[0004] However, the disadvantages of the existing technology and the above-mentioned patent application are: (1) There is a lack of online monitoring and automatic judgment of the operating status of primary equipment. When the line is in cold standby or maintenance status, the protection device is prone to false alarm signals. The existing technology and the above-mentioned patent cannot achieve the shielding of false signals; (2) The tripping circuit is composed of components such as the protection action contact of the protection device, the output pressure plate, the normally open auxiliary contact of the circuit breaker, and the tripping coil. It can be divided into signal circuit and actual control circuit. The existing technology and the above-mentioned patent cannot achieve accurate location of the circuit fault point, which is not conducive to quickly eliminating the fault. Summary of the Invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the technical problem solved by this invention is: how to accurately locate the fault point of the circuit and quickly eliminate the fault.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an online monitoring method for line protection tripping circuits of primary equipment status, comprising the following steps,

[0008] The operating status of the line is determined by using the data collected from each interval by the acquisition system.

[0009] The determination of the line operating status includes determining whether the circuit breaker is in the closed position, whether the disconnector is in the closed position, and whether the disconnector is in the open position.

[0010] When the isolating switch is in the closed position, determine whether there is voltage, current, or power transmission in the line.

[0011] The line operation status is determined by using line voltage determination, line current determination, line transmission power determination, circuit breaker position status determination, and isolating switch position determination.

[0012] The trip circuit status is determined when the line is in normal or hot standby status.

[0013] The determination of the trip circuit status includes determining whether the trip circuit is normal, whether the output pressure plate LP is abnormal, whether the signal circuit is abnormal, and whether the actual control circuit is abnormal.

[0014] As a preferred embodiment of the online monitoring method for line protection tripping circuit of primary equipment status described in this invention, the method for determining whether the circuit breaker is in the closed position includes collecting the circuit breaker position DL, where DL is assigned a value of 1 when the circuit breaker is in the closed position and a value of 0 when it is in the open position.

[0015] When the circuit breaker is in the closed position, determine whether the disconnector is in the closed position.

[0016] The determination of whether the disconnector is in the closed position includes collecting the bus-side disconnector position G1, the line-side disconnector position G6, and assigning a value of 1 to G1 when the bus-side disconnector is closed and 0 when it is open. The line-side disconnector is assigned a value of 1 when it is closed and 0 when it is open.

[0017] As a preferred embodiment of the online monitoring method for line protection tripping circuits of primary equipment status according to the present invention, wherein: determining whether the line has voltage includes, when U x ≥70%U L &ΔU≤5%U L When U is present, it indicates that there is voltage in the line. x ≤30%U L When the signal is 0, it indicates that the line is not under voltage.

[0018] The determination of whether there is current in the line includes, if |I L |≥I c When |I| = 0, it indicates that there is current in the line, if |I| = 0. L |<I c If , it means there is no current in the line.

[0019] As a preferred embodiment of the online monitoring method for line protection tripping circuits of primary equipment status according to the present invention, the step of determining whether the line is transmitting power includes, if the line is carrying a load, transmitting power. When this time, it indicates that there is power transmission on the line. When the signal is zero, it indicates that the line is transmitting power at no power.

[0020] Among them, U x U represents the line voltage collected by the Baoxin substation. L The voltage rating of the transmission line is represented by I, ΔU represents the voltage drop across the line, and I represents the voltage rating of the transmission line. L I represents the line current. C This represents the capacitance current to ground of the overhead line. express and The angle between them p represents the voltage on one side of the line. min This represents the minimum permissible active power.

[0021] As a preferred embodiment of the online monitoring method for line protection tripping circuits of primary equipment status described in this invention, the process of determining the line operating status includes determining that the line is in operation when DL=1, G1=1, and G6=1.

[0022] If U is satisfied at the same time x ≥70%U L ΔU≤5%, |I L |≥I c P > P min When the signal is 0, it indicates that the line is operating normally.

[0023] If U is satisfied at the same time x ≤30%U L 、|I L |≥I c P > P min When this occurs, it indicates that the line PT is disconnected, and an alarm signal is issued.

[0024] If U is satisfied at the same time x ≥70%U L ΔU≤5%, |I L |≤I c P < P min When this occurs, it indicates that the line CT is disconnected, and an alarm signal is issued.

[0025] When DL=0, G1=1, G6=1, |I L |≤I c When the circuit breaker is in the open state, it indicates that the line is in hot standby mode and the circuit breaker is in the open state.

[0026] When the circuit breaker is in the open state, determine whether the voltages of each circuit in the open output circuit are normal.

[0027] When DL=0, G1=0, G6=0, |I L |≤I c When the circuit breaker is in a cold standby state, it indicates that the line is in a cold standby state and the circuit breaker is in an open state.

[0028] When DL=0, G1=0, G6=0, |I L |≤I c If the device maintenance switch is in the "on" state when the data acquisition system acquires the data, it indicates that the line is under maintenance.

[0029] As a preferred embodiment of the online monitoring method for line protection tripping circuits of primary equipment status described in this invention, the determination of the tripping circuit status further includes, when the line is in normal operation or hot standby state, further determining the voltage potential of each sampling point of the tripping circuit and making different judgments based on different voltage potentials.

[0030] The different judgments include the following: when the line is in normal operation, the circuit breaker is in the closed position and the normally open contact of the circuit breaker DL is closed.

[0031] When the line is in normal operation, determine whether the trip circuit is normal, whether the output pressure plate LP is abnormal, and the cause of the control circuit disconnection alarm.

[0032] The determination of whether the tripping circuit is normal includes when the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ + )×U +KM When, it means that the sampled value U1 and the sampled value U +KM With the same potential polarity and normal sampled values, when the sampled value U3 satisfies (1-δ) - )×U -KM ≤U3≤(1+δ-)×U -KM When, it means U3 and U -KM When the potential polarity is the same and the sampled value is normal, and the sampled value U2 satisfies When, it means that U2 and U3 have the same potential polarity and the secondary circuit between U2 and U3 satisfies Kirchhoff's voltage law.

[0033] If U1, U2, and U3 are satisfied simultaneously, it indicates that the online monitoring result of the tripping circuit is normal and there is no abnormality in the circuit.

[0034] The determination of whether the outlet pressure plate LP is abnormal includes when the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ+ )×U +KM When, it means that the sampled value U1 and the sampled value U +KM With the same potential polarity and normal sampled values, when the sampled value U3 satisfies (1-δ) - )×U -KM ≤U3≤(1+δ - )×U -KM When, it means U3 and U -KM When the potential polarity is the same and the sampled value is normal, and the sampled value U2 satisfies If the value is too high, it indicates that the U2 sample value is abnormal.

[0035] When U1, U2, and U3 are simultaneously satisfied, the online monitoring result of the trip circuit is abnormal, and the abnormal point of the circuit is located at the outlet pressure plate LP.

[0036] The determination of the cause of the control loop disconnection alarm includes: the acquisition system acquires the control loop disconnection alarm signal, and the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ + )×U +KM The sampled value U3 satisfies (1-δ - )×U -KM ≤U3≤(1+δ - )×U -KM The sampled value U2 satisfies When the signal is 0, it indicates that the actual control circuit is functioning normally and the abnormal point of the circuit is located in the signal circuit.

[0037] The determination of the cause of the control loop disconnection alarm also includes that the acquisition system acquires the control loop disconnection alarm signal, and the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ + )×U +KM The sampled value U3 satisfies (1-δ + )×U +KM ≤U3≤(1+δ + )×U +KM When, it means U3 and U +KM The signal loop between them is normal, U3 to U -KM An anomaly occurred in the actual control loop between them, and the anomaly point was located in the actual control loop.

[0038] As a preferred embodiment of the online monitoring method for line protection tripping circuit of primary equipment status described in this invention, the different judgments further include: when the line is in hot standby, the circuit breaker is in the tripped position and the normally open contact of the circuit breaker DL is open.

[0039] When the line is in hot standby mode, determine whether the tripping circuit is normal, including sampling points U1, U2, and U3 simultaneously satisfying (1-δ + )×U +KM ≤U≤(1+δ + )×U +KM When, it indicates that sampling points U1, U2, U3 and U +KM If the potential polarity is the same and the sampled value is normal, then the online monitoring result of the trip circuit is normal and there is no abnormality in the circuit.

[0040] When the line is in hot standby mode, determine whether the outlet pressure plate LP is abnormal, including sampling points U1 and U3 simultaneously satisfying (1-δ + )×U +KM ≤U≤(1+δ + )×U +KM When, it indicates that sampling points U1, U3 and U +KM The potential polarities are the same and the sampled values ​​are normal.

[0041] Sampling point U2 satisfies When this occurs, it indicates that sampling point U2 is abnormal.

[0042] If sampling points U1, U2, and U3 all meet the conditions, the online monitoring result of the trip circuit is abnormal, and the abnormal point of the circuit is located at the outlet pressure plate LP.

[0043] When the line is in hot standby mode, determine whether the signal loop is abnormal, including whether sampling point U1 satisfies (1-δ + )×U +KM ≤U 1，3 ≤(1+δ + )×U +KM When, it indicates that sampling point U1 and U +KM The potential polarities are the same and the sampled values ​​are normal.

[0044] Sampling points U2 and U3 satisfy -δ + ×U +KM ≤U≤δ + ×U +KM When the sampling values ​​of sampling points U2 and U3 are abnormal, it indicates that the abnormal point of the circuit is located in the signal circuit.

[0045] Among them, U1, U2, U3, U -KM U +KM For sampling points, δ + This represents the error coefficient of the positive terminal of the DC power supply. δ - U represents the error coefficient of the negative terminal of the DC power supply. 额定+ U 额定- This indicates the rated positive and negative voltage values ​​corresponding to the DC power supply system.

[0046] Another objective of this invention is to provide an online monitoring system for line protection tripping circuits of primary equipment status, which can collect and analyze various parameters of power lines in real time and efficiently, thus solving the problems of insufficient timeliness in detecting abnormal line conditions, inaccurate fault location, and long response delay in the prior art.

[0047] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an online monitoring system for line protection tripping circuits of primary equipment status, including a data acquisition module, an analysis module, and a master station module.

[0048] The acquisition module is responsible for acquiring data such as line voltage, line current, line impedance, line transmission power, circuit breaker position, isolating switch position, and maintenance pressure plate status.

[0049] The analysis module is used to analyze line voltage, current, power, and location information to determine whether the line is in normal operation, hot standby, cold standby, or maintenance status. Based on the line status judgment results, it decides whether to conduct trip circuit voltage and potential analysis to determine whether the trip circuit status is abnormal and, if abnormal, to locate the fault point.

[0050] The main station module is used to process, analyze, and publish the input information from the analysis modules of each plant.

[0051] A computer device includes a memory and a processor, the memory storing a computer program, characterized in that the processor executes the computer program to implement the steps of the online monitoring method for line protection tripping circuits of primary equipment status as described above.

[0052] A computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of the online monitoring method for line protection tripping circuits of primary equipment status as described above.

[0053] The beneficial effects of this invention are as follows: This invention enables real-time monitoring of the entire tripping circuit and alarms for abnormal states of the pressure plate; it distinguishes the causes of "control circuit disconnection" alarms, locating the abnormal point as either an internal or external circuit of the device, thus supporting on-site maintenance personnel to quickly locate and eliminate faults; it achieves online monitoring and automatic judgment of the operating status of primary equipment; it monitors the tripping circuit when the primary equipment is in normal operation or hot standby mode; and it shields the tripping circuit signal when the primary equipment is in cold standby or maintenance mode to avoid false alarms. It achieves real-time monitoring of the entire tripping circuit and can determine whether the abnormal point of the tripping circuit is located in the outlet pressure plate, signal circuit, or actual control circuit, enabling precise location of circuit fault points, thus supporting on-site maintenance personnel to quickly locate and eliminate faults. Attached Figure Description

[0054] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 The overall flowchart of the online monitoring method for line protection tripping circuits of primary equipment status provided in the first embodiment of the present invention is shown.

[0056] Figure 2 The MN line equivalent system diagram is provided in the online monitoring method for line protection tripping circuits of primary equipment status provided in the first embodiment of the present invention.

[0057] Figure 3 The diagram showing the voltage and current vector relationship between the two sides of the line in the online monitoring method for line protection tripping circuits of primary equipment status provided in the first embodiment of the present invention.

[0058] Figure 4 The trip circuit status determination diagram is provided in the online monitoring method for line protection trip circuits of primary equipment status according to the first embodiment of the present invention.

[0059] Figure 5 The overall framework diagram of the online monitoring system for line protection tripping circuits of primary equipment status provided in the second embodiment of the present invention is shown. Detailed Implementation

[0060] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0061] Example 1

[0062] Reference Figures 1-4 As an embodiment of the present invention, an online monitoring method for line protection tripping circuits of primary equipment status is provided, characterized in that:

[0063] S1: Determine the line operating status using data collected from each interval by the acquisition system.

[0064] Determining the operating status of the line includes determining whether the circuit breaker is in the closed position, whether the disconnector is in the closed position, and whether the disconnector is in the open position.

[0065] Furthermore, determining whether the circuit breaker is in the closed position includes collecting the circuit breaker position DL. When the circuit breaker is in the closed position, DL is assigned a value of 1, and when it is in the open position, DL is assigned a value of 0.

[0066] When the circuit breaker is in the closed position, determine whether the disconnector is in the closed position.

[0067] Determining whether the disconnector is in the closed position includes collecting the bus-side disconnector position G1 and the line-side disconnector position G6. When the bus-side disconnector is closed, G1 is assigned a value of 1, and when it is open, G1 is assigned a value of 0. When the line-side disconnector is closed, G6 is assigned a value of 1, and when it is open, G6 is assigned a value of 0.

[0068] S2: When the isolating switch is in the closed position, determine whether there is voltage, current, or power transmission in the line.

[0069] Determine if there is voltage in the line, including when U is satisfied. x ≥70%U L &ΔU≤5%U L When U is present, it indicates that there is voltage in the line. x ≤30%U L When the signal is 0, it indicates that the line is not under voltage.

[0070] Determine if the circuit contains current; if it satisfies |I L |≥I c When |I| = 0, it indicates that there is current in the line, if |I| = 0. L |<I c If , it means there is no current in the line.

[0071] Determining whether a line is transmitting power includes assessing whether the line is carrying a load and transmitting power. When this time, it indicates that there is power transmission on the line. When the signal is zero, it indicates that the line is transmitting power at no power.

[0072] Among them, U x U represents the line voltage collected by the Baoxin substation. L ΔU represents the rated voltage of the transmission line, and ΔU represents the line voltage drop.

[0073] like Figures 2-3 As shown, where, I represents the line current. C This represents the capacitance current to ground of the overhead line. express and The angle between them This represents the voltage across the line, and the line impedance is Z. MN The impedance angle of the line is denoted as . The voltage on both sides of the line meets

[0074] A special explanation is needed. This indicates the directional line current. This indicates a directional line voltage.

[0075] S3: The line operation status is determined by using line voltage determination, line current determination, line transmission power determination, circuit breaker position status determination, and isolating switch position determination.

[0076] The process of determining the line's operational status includes determining that the line is in operation when DL=1, G1=1, and G6=1.

[0077] If U is satisfied at the same time x ≥70%U L ΔU≤5%, |I L |≥I c P > P min When the signal is 0, it indicates that the line is operating normally.

[0078] If U is satisfied at the same time x ≤30%U L 、|I L |≥I c P > P min When this occurs, it indicates that the line PT is disconnected, and an alarm signal is issued.

[0079] If U is satisfied at the same time x ≥70%U L ΔU≤5%, |I L |≤I c P < P min When this occurs, it indicates that the line CT is disconnected, and an alarm signal is issued.

[0080] When DL=0, G1=1, G6=1, |I L |≤I c When the circuit breaker is in the open state, it indicates that the line is in hot standby mode and the circuit breaker is in the open state.

[0081] When the circuit breaker is in the open state, determine whether the voltages of each circuit in the open output circuit are normal.

[0082] When DL=0, G1=0, G6=0, |I L |≤I c When the circuit breaker is in a cold standby state, it indicates that the line is in a cold standby state and the circuit breaker is in an open state.

[0083] When DL=0, G1=0, G6=0, |I L |≤I c If the device maintenance switch is in the "on" state when the data acquisition system acquires the data, it indicates that the line is under maintenance.

[0084] The trip circuit status is determined when the line is in normal or hot standby status.

[0085] Determining the status of the trip circuit includes determining whether the trip circuit is normal, whether the output pressure plate LP is abnormal, whether the signal circuit is abnormal, and whether the actual control circuit is abnormal.

[0086] like Figure 4 As shown, further, determining the trip circuit status also includes, when the line is in normal operation or hot standby, further judging the voltage potential of each sampling point of the trip circuit and making different judgments based on different voltage potentials.

[0087] Different judgments include when the line is in normal operation, the circuit breaker is in the closed position, and the normally open contact of the circuit breaker DL is closed.

[0088] When the line is in normal operation, determine whether the trip circuit is normal, whether the output pressure plate LP is abnormal, and the cause of the control circuit disconnection alarm.

[0089] Determining whether a tripping circuit is normal includes checking if the sampled value U1 satisfies (1-δ) + )×U +KM ≤U1≤(1+δ + )×U +KM When, it means that the sampled value U1 and the sampled value U +KM With the same potential polarity and normal sampled values, when the sampled value U3 satisfies (1-δ) - )×U -KM ≤U3≤(1+δ - )×U -KM When, it means U3 and U -KM When the potential polarity is the same and the sampled value is normal, and the sampled value U2 satisfies When, it means that U2 and U3 have the same potential polarity and the secondary circuit between U2 and U3 satisfies Kirchhoff's voltage law.

[0090] If U1, U2, and U3 are satisfied simultaneously, it indicates that the online monitoring result of the tripping circuit is normal and there is no abnormality in the circuit.

[0091] Determining whether the outlet pressure plate LP is abnormal includes determining if the sampled value U1 satisfies (1-δ) + )×U +KM ≤U1≤(1+δ + )×U +KM When, it means that the sampled value U1 and the sampled value U +KM With the same potential polarity and normal sampled values, when the sampled value U3 satisfies (1-δ) - )×U -KM ≤U3≤(1+δ-)×U-KM When, it means U3 and U -KM When the potential polarity is the same and the sampled value is normal, and the sampled value U2 satisfies If the value is too high, it indicates that the U2 sample value is abnormal.

[0092] When U1, U2, and U3 are simultaneously satisfied, the online monitoring result of the trip circuit is abnormal, and the abnormal point of the circuit is located at the outlet pressure plate LP.

[0093] The causes of a control loop disconnection alarm include: the acquisition system detects a control loop disconnection alarm signal, and the sampled value U1 satisfies (1-δ) / 2. + )×U +KM ≤U1≤(1+δ + )×U +KM The sampled value U3 satisfies (1-δ - )×U -KM ≤U3≤(1+δ - )×U -KM The sampled value U2 satisfies When the signal is 0, it indicates that the actual control circuit is functioning normally and the abnormal point of the circuit is located in the signal circuit.

[0094] Determining the cause of a control loop disconnection alarm also includes that the acquisition system collects a control loop disconnection alarm signal, and the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ + )×U +KM The sampled value U3 satisfies (1-δ + )×U +KM ≤U3≤(1+δ + )×U +KM When, it means U3 and U +KM The signal loop between them is normal, U3 to U -KM An anomaly occurred in the actual control loop between them, and the anomaly point was located in the actual control loop.

[0095] Different judgments also include the circuit breaker being in the open position when the line is in hot standby mode, and the normally open contact of the circuit breaker DL being open.

[0096] When the line is in hot standby mode, determine whether the tripping circuit is normal, including sampling points U1, U2, and U3 simultaneously satisfying (1-δ + )×U +KM ≤U≤(1+δ + )×U +KM When, it indicates that sampling points U1, U2, U3 and U +KM If the potential polarity is the same and the sampled value is normal, then the online monitoring result of the trip circuit is normal and there is no abnormality in the circuit.

[0097] When the line is in hot standby mode, determine whether the outlet pressure plate LP is abnormal, including sampling points U1 and U3 simultaneously satisfying (1-δ + )×U +KM ≤U≤(1+δ + )×U +KM When, it indicates that sampling points U1, U3 and U +KM The potential polarities are the same and the sampled values ​​are normal.

[0098] Sampling point U2 satisfies When this occurs, it indicates that sampling point U2 is abnormal.

[0099] If sampling points U1, U2, and U3 all meet the conditions, the online monitoring result of the trip circuit is abnormal, and the abnormal point of the circuit is located at the outlet pressure plate LP.

[0100] When the line is in hot standby mode, determine whether the signal loop is abnormal, including whether sampling point U1 satisfies (1-δ + )×U +KM ≤U 1，3 ≤(1+δ + )×U +KM When, it indicates that sampling point U1 and U +KM The potential polarities are the same and the sampled values ​​are normal.

[0101] Sampling points U2 and U3 satisfy -δ + ×U +KM ≤U≤δ + ×U +KM When the sampling values ​​of sampling points U2 and U3 are abnormal, it indicates that the abnormal point of the circuit is located in the signal circuit.

[0102] Among them, U1, U2, U3, U -KM U +KM For sampling points, δ + This represents the error coefficient of the positive terminal of the DC power supply. δ - U represents the error coefficient of the negative terminal of the DC power supply. 额定+ U 额定- This indicates the rated positive and negative voltage values ​​corresponding to the DC power supply system.

[0103] Example 2

[0104] Reference Figure 5 As an embodiment of the present invention, a system for online monitoring of line protection tripping circuits of primary equipment status is provided. The online monitoring of line protection tripping circuits of primary equipment status includes an acquisition module, an analysis module, and a master station module.

[0105] The data acquisition module is responsible for collecting line voltage, line current, line impedance, line transmission power, circuit breaker position, isolating switch position, and maintenance pressure plate status. The analysis module is used to analyze the line voltage, current, power, and location information to determine whether the line is in normal operation, hot standby, cold standby, or maintenance status. Based on the line status judgment results, it decides whether to conduct trip circuit voltage and potential analysis to determine whether the trip circuit status is abnormal and, if abnormal, to locate the fault point. The master station module is used to process, analyze, and publish the input information from the analysis modules of each plant.

[0106] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0107] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0108] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0109] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0110] Example 3

[0111] In this embodiment, in order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments, as detailed below.

[0112] The dispatching agency detected that a 110kV line at a 220kV substation was operating normally and issued an "abnormal alarm signal of control circuit disconnection." On-site professionals used a multimeter to measure the trip potentials: U1, U2, and U3 potentials were +112.2V, +111.8V, and +111.6V respectively. The DC system U... 额定+ 110V, U 额定- It is 112V.

[0113] Calculate the above voltages:

[0114]

[0115] (1-δ + )×U +KM = (1 - 1.8%) × 112 = 109.98

[0116] (1+δ + )×U +KM = (1 + 1.8%) × 112 = 114.02

[0117] The potentials of U1 and U3 both satisfy (1-δ) + )×U +KM ≤U≤(1+δ + )×U +KM If the conditions for judging an abnormality in the actual control loop are met, the actual control loop is judged to be abnormal.

[0118] After on-site inspection, the cause of the trip circuit abnormality was determined to be a burnt-out trip coil, which is consistent with the abnormality point located in the actual control circuit as identified in this invention.

[0119] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for online monitoring of line protection tripping circuits in primary equipment status, characterized in that, include: The operating status of the line is determined by using the data collected from each interval by the acquisition system; The determination of the line operating status includes determining whether the circuit breaker is in the closed position, whether the disconnector is in the closed position, and whether the disconnector is in the open position. When the isolating switch is in the closed position, determine whether there is voltage, current, or power transmission in the line; The line operation status is determined by using line voltage determination, line current determination, line transmission power determination, circuit breaker position status determination, and isolating switch position determination. Determine the trip circuit status when the line is in normal or hot standby mode. The determination of the trip circuit status includes determining whether the trip circuit is normal, whether the output pressure plate LP is abnormal, whether the signal circuit is abnormal, and whether the actual control circuit is abnormal.

2. The online monitoring method for line protection tripping circuits of primary equipment status as described in claim 1, characterized in that: Whether the circuit breaker is in the closed position includes collecting the circuit breaker position DL. When the circuit breaker is in the closed position, DL is assigned a value of 1, and when it is in the open position, DL is assigned a value of 0. When the circuit breaker is in the closed position, determine whether the disconnector is in the closed position; The determination of whether the disconnector is in the closed position includes collecting the bus-side disconnector position G1, the line-side disconnector position G6, and assigning a value of 1 to G1 when the bus-side disconnector is closed and 0 when it is open. The line-side disconnector is assigned a value of 1 when it is closed and 0 when it is open.

3. The online monitoring method for line protection tripping circuits of primary equipment status as described in claim 2, characterized in that: The determination of whether the line has voltage includes, when U is satisfied... x ≥70%U L &ΔU≤5%U L When U is present, it indicates that there is voltage in the line. x ≤30%U L When the signal is 0, it indicates that the line is unpowered; The determination of whether there is current in the line includes, if |I L |≥I c When |I| = 0, it indicates that there is current in the line, if |I| = 0. L |<I c If , it means there is no current in the line.

4. The online monitoring method for line protection tripping circuits of primary equipment status as described in claim 3, characterized in that: The determination of whether the line is transmitting power includes transmitting power if the line is under load. When this time, it indicates that there is power transmission on the line. When this occurs, it indicates that the line is transmitting power at no power. Among them, U x U represents the line voltage collected by the Baoxin substation. L The voltage rating of the transmission line is represented by I, ΔU represents the voltage drop across the line, and I represents the voltage rating of the transmission line. L I represents the line current. C This represents the capacitance current to ground of the overhead line. express and The angle between them p represents the voltage on one side of the line. min This represents the minimum permissible active power.

5. The online monitoring method for line protection tripping circuits of primary equipment status as described in claim 4, characterized in that: The process of determining the line's operating status includes determining that the line is in operation when DL=1, G1=1, and G6=1. If U is satisfied at the same time x ≥70%U L ΔU≤5%, |I L |≥I c P > P min When this time is reached, it indicates that the line is operating normally; If U is satisfied at the same time x ≤30%U L 、|I L |≥I c P > P min When this happens, it indicates that the line PT is disconnected, and an alarm signal is issued; If U is satisfied at the same time x ≥70%U L ΔU≤5%, |I L |≤I c P < P min When this happens, it indicates that the line CT is disconnected and an alarm signal is issued; When DL=0, G1=1, G6=1, |I L |≤I c When the circuit breaker is in the open state, it indicates that the line is in hot standby mode and the circuit breaker is in the open state. When the circuit breaker is in the open state, determine whether the voltages of each circuit in the open output circuit are normal. When DL=0, G1=0, G6=0, |I L |≤I c When the circuit breaker is in the open state, it indicates that the line is in cold standby mode and the circuit breaker is in the open state. When DL=0, G1=0, G6=0, |I L |≤I c If the device maintenance switch is in the "on" state when the data acquisition system acquires the data, it indicates that the line is under maintenance.

6. The online monitoring method for line protection tripping circuits of primary equipment status as described in claim 5, characterized in that: The determination of the tripping circuit status also includes, when the line is in normal operation or hot standby state, further judging the voltage potential of each sampling point of the tripping circuit and making different judgments based on different voltage potentials. The different judgments include: when the line is in normal operation, the circuit breaker is in the closed position and the normally open contact of the circuit breaker DL is closed. When the line is in normal operation, determine whether the tripping circuit is normal, whether the output pressure plate LP is abnormal, and the cause of the control circuit disconnection alarm. The determination of whether the tripping circuit is normal includes when the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ + )×U +KM When, it means that the sampled value U1 and the sampled value U +KM With the same potential polarity and normal sampled values, when the sampled value U3 satisfies (1-δ) - )×U -KM ≤U3≤(1+δ - )×U -KM When, it means U3 and U -KM When the potential polarity is the same and the sampled value is normal, and the sampled value U2 satisfies When, it means that U2 and U3 have the same potential polarity and the secondary circuit between U2 and U3 satisfies Kirchhoff's voltage law; If U1, U2, and U3 are all satisfied, it indicates that the online monitoring result of the tripping circuit is normal and there is no abnormality in the circuit. The determination of whether the outlet pressure plate LP is abnormal includes when the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ + )×U +KM When, it means that the sampled value U1 and the sampled value U +KM With the same potential polarity and normal sampled values, when the sampled value U3 satisfies (1-δ) - )×U -KM ≤U3≤(1+δ - )×U -KM When, it means U3 and U -KM When the potential polarity is the same and the sampled value is normal, and the sampled value U2 satisfies If this occurs, it indicates that the U2 sample value is abnormal; When U1, U2, and U3 are all satisfied, the online monitoring result of the trip circuit is abnormal, and the abnormal point of the circuit is located at the outlet pressure plate LP. The determination of the cause of the control loop disconnection alarm includes: the acquisition system acquires the control loop disconnection alarm signal, and the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ + )×U +KM The sampled value U3 satisfies (1-δ - )×U -KM ≤U3≤(1+δ - )×U -KM The sampled value U2 satisfies When the signal is in the signal loop, it indicates that the actual control loop is functioning normally and the abnormal point of the loop is located in the signal loop. The determination of the cause of the control loop disconnection alarm also includes that the acquisition system acquires the control loop disconnection alarm signal, and the sampled value U1 satisfies (1-δ + )×U +KM ≤U1≤(1+δ + )×U +KM The sampled value U3 satisfies (1-δ + )×U +KM ≤U3≤(1+δ + )×U +KM When, it means U3 and U +KM The signal loop between them is normal, U3 to U -KM An anomaly occurred in the actual control loop between them, and the anomaly point was located in the actual control loop.

7. The online monitoring method for line protection tripping circuits of primary equipment status as described in claim 6, characterized in that: The different judgments also include, when the line is in hot standby, the circuit breaker is in the tripped position and the normally open contact of the circuit breaker DL is open. When the line is in hot standby mode, determine whether the tripping circuit is normal, including sampling points U1, U2, and U3 simultaneously satisfying (1-δ + )×U +KM ≤U≤(1+δ + )×U +KM When, it indicates that sampling points U1, U2, U3 and U +KM If the potential polarity is the same and the sampled value is normal, then the online monitoring result of the trip circuit is normal and there is no abnormality in the circuit. When the line is in hot standby mode, determine whether the outlet pressure plate LP is abnormal, including sampling points U1 and U3 simultaneously satisfying (1-δ + )×U +KM ≤U≤(1+δ + )×U +KM When, it indicates that sampling points U1, U3 and U +KM The potential polarities are the same and the sampled values ​​are normal; Sampling point U2 satisfies When this occurs, it indicates that sampling point U2 is abnormal; If sampling points U1, U2, and U3 all meet the conditions, the online monitoring result of the trip circuit is abnormal, and the abnormal point of the circuit is located at the outlet pressure plate LP. When the line is in hot standby mode, determine whether the signal loop is abnormal, including whether sampling point U1 satisfies (1-δ + )×U +KM ≤U 1，3 ≤(1+δ + )×U +KM When, it indicates that sampling point U1 and U +KM The potential polarities are the same and the sampled values ​​are normal; Sampling points U2 and U3 satisfy -δ + ×U +KM ≤U≤δ + ×U +KM When the sampling values ​​of sampling points U2 and U3 are abnormal, the abnormal point of the circuit is located in the signal circuit; Among them, U1, U2, U3, U -KM U +KM For sampling points, δ + This represents the error coefficient of the positive terminal of the DC power supply. δ - U represents the error coefficient of the negative terminal of the DC power supply. 额定+ U 额定- This indicates the rated positive and negative voltage values ​​corresponding to the DC power supply system.

8. A system employing the online monitoring method for line protection tripping circuits based on the primary equipment status as described in any one of claims 1 to 7, characterized in that: It includes a data acquisition module, an analysis module, and a main station module; The acquisition module is responsible for acquiring the line voltage, line current, line impedance, line transmission power, circuit breaker position, isolating switch position, and maintenance pressure plate status of the system. The analysis module is used to analyze line voltage, current, power, and location information to determine whether the line is in normal operation, hot standby, cold standby, or maintenance status. Based on the line status judgment results, it decides whether to conduct trip circuit voltage and potential analysis to determine whether the trip circuit status is abnormal and, if abnormal, to locate the fault point. The main station module is used to process, analyze, and publish the input information from the analysis modules of each plant.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the online monitoring method for line protection tripping circuits of primary equipment status as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the online monitoring method for the line protection tripping circuit of the primary equipment status as described in any one of claims 1 to 7.

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