CN-122026244-A - Automatic triggering method and system for emergency pressure relief of ring main unit with linkage air pressure monitoring function

CN122026244ACN 122026244 ACN122026244 ACN 122026244ACN-122026244-A

Abstract

The invention discloses a method and a system for automatically triggering emergency pressure relief of a ring main unit in a linked air pressure monitoring manner, and relates to the technical field of ring main units, wherein the method comprises the following steps of collecting a multi-point air pressure time sequence and performing phase difference analysis at the moment of arc fault of the ring main unit to generate a pressure phase distribution diagram; the method comprises the steps of identifying a phase inversion interval based on phase distribution to form a shock wave cancellation risk time sequence result, carrying out superposition reconstruction on multi-point pressure amplitude values to obtain a space superposition pressure evolution graph, constructing a continuous risk accumulation curve, and carrying out pre-trigger control according to the continuous risk accumulation curve to enable pressure relief to be started before shock waves are superposed again. The invention eliminates the destructive interference of shock waves through multi-point air pressure phase analysis and space superposition reconstruction, constructs a continuous risk accumulation curve, avoids the emergency pressure relief triggering delay of the ring main unit, realizes front trigger based on the risk accumulation curve, enables pressure relief to be started before shock waves are superposed again, reduces the pressure peak value of a shell, and improves the safety of the ring main unit under arc faults.

Inventors

LIU GENGSHENG
HUANG NINGNING
SHI LANG
ZHOU HUABIN
YU JIANFENG
DAI SHOUXIANG
ZHAO RUIQI
ZHANG SHUANGXIONG
WANG HUATIAN
LI ZHIYONG
WANG ZHI
QIAN JIANGQI
WU XIAOYANG

Assignees

南京海兴电网技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260416

Claims (10)

1. The automatic triggering method for emergency pressure relief of the ring main unit for linkage air pressure monitoring is characterized by comprising the following steps: At the moment of arc fault in the ring main unit, acquiring air pressure time series data of a plurality of acquisition points, and performing phase difference analysis on the air pressure time series data of the plurality of acquisition points under a unified time reference to generate a pressure phase distribution diagram reflecting the change of the propagation direction of the shock wave; based on the pressure phase distribution diagram, synchronously comparing the pressure change directions of a plurality of acquisition points at adjacent moments, extracting phase inversion regions with opposite pressure change directions, and forming a shock wave cancellation risk time sequence result; Overlapping and reconstructing the pressure amplitude values of a plurality of acquisition points according to the shock wave destructive risk time sequence result to obtain a space overlapping pressure evolution diagram; Based on a space superposition pressure evolution diagram, continuously increasing and judging the pressure increase rate, and taking a transient descent interval corresponding to a shock wave destructive risk time sequence result into an integral pressure increase sequence to construct an uninterruptible risk accumulation curve; and performing front trigger control on the emergency pressure relief action according to the risk accumulation curve, and completing pressure relief starting before the shock waves are concentrated and overlapped again.
2. The method for automatically triggering emergency pressure relief of a ring main unit for monitoring the air pressure in a linkage manner according to claim 1, wherein the step of generating a pressure phase distribution map reflecting the change of the propagation direction of the shock wave comprises the following steps: at the moment of arc fault in the ring main unit, a plurality of acquisition points are distributed around an arc diffusion space path, and each acquisition point synchronously records continuous air pressure change data with a uniform time starting point to form air pressure time sequence data arranged in time sequence; Under the unified time reference, the air pressure time series data are arranged time by time, air pressure values corresponding to all time nodes are compared, and each acquisition point is determined to be in a pressure rising stage or a pressure falling stage at all time nodes, so that a phase difference relation sequence is formed; according to the phase difference relation sequence, mapping the pressure change direction of each time node to the space position of the corresponding acquisition point, and synchronously associating the time node with the space position to construct a pressure phase distribution diagram.
3. The automatic triggering method for emergency pressure relief of a ring main unit for linkage air pressure monitoring according to claim 2, wherein the steps of extracting phase reversal regions with opposite pressure change directions and forming a shock wave cancellation risk time sequence result comprise the following steps: reading the space state distribution corresponding to each time node one by one according to a unified time reference in the pressure phase distribution diagram, listing the pressure change direction of each acquisition point at each time node, and forming a continuously arranged direction change track; According to the direction change track, carrying out corresponding comparison on the spatial direction distribution between adjacent time nodes, extracting time sections with pressure rising directions and pressure falling directions in a plurality of continuous time nodes in a space position alternating arrangement relation, and determining a phase inversion section; And (3) corresponding the phase inversion interval and the space propagation track in the pressure phase distribution map, reading the space state distribution corresponding to each time node time by time in the phase inversion interval, and forming a space pressure change direction combination state according to the arrangement of each acquisition point in the pressure change direction of the corresponding time node, thereby forming a time sequence result of eliminating the risk of the shock waves arranged in time sequence.
4. The automatic triggering method for emergency pressure relief of a ring main unit for linkage air pressure monitoring according to claim 3, wherein the step of performing superposition reconstruction on pressure amplitudes of a plurality of acquisition points to obtain a spatial superposition pressure evolution diagram comprises the following steps: Reading a starting time node and a terminating time node of each risk section in the shock wave destructive risk time sequence result, wherein the risk sections are time sections in the shock wave destructive risk time sequence result formed by time sequence arrangement of phase inversion sections extracted according to a pressure phase distribution diagram, and extracting pressure amplitudes of a plurality of acquisition points at each time node to form a multi-point pressure amplitude sequence; According to the multipoint pressure amplitude sequence, carrying out uniform direction treatment on the pressure amplitude of each acquisition point in the risk section by time nodes, and adjusting the pressure amplitude in the pressure drop stage to be consistent with the change direction of the pressure rise stage in the same time node to form a continuous growth sequence; In a multipoint pressure amplitude sequence for completing the unified processing of the direction, the pressure amplitudes of a plurality of acquisition points of each time node are spatially arranged and integrated to form a spatial pressure evolution sequence which is arranged in time sequence; And mapping the spatial pressure evolution sequence into a spatial superposition pressure evolution graph taking the time node as a transverse arrangement axis and the spatial position as a longitudinal arrangement basis.
5. The automatic triggering method for emergency pressure relief of a ring main unit for linkage air pressure monitoring according to claim 4, wherein the direction unified processing is continuously executed in a risk section according to a unified time reference time-by-time node, and a continuous growth sequence formed by the direction unified processing is ensured to keep a one-to-one correspondence with a space pressure evolution sequence on a time axis, so as to form a continuous growth sequence.
6. The method for automatically triggering emergency pressure relief of ring main unit with linkage air pressure monitoring according to claim 4, wherein constructing an uninterruptible risk accumulation curve comprises the following steps: Reading the space superposition pressure values corresponding to all time nodes in the space superposition pressure evolution diagram under a unified time reference, and comparing the space superposition pressure values of adjacent time nodes to form a pressure increase rate state sequence arranged in time sequence; Corresponding the pressure increase rate state sequence and the shock wave cancellation risk time sequence result, carrying out connection processing on the time node recorded as the descending node in the risk section, and incorporating the transient descending section into the whole pressure increase sequence to form a continuous increase track; recording pressure increasing states node by node on the continuous increasing track according to a unified time reference to obtain an increasing pressure change sequence covering a complete time axis; and accumulating the incremental pressure change sequences node by node in time sequence to form an uninterrupted risk accumulation curve.
7. The automatic triggering method for emergency pressure relief of a ring main unit for linkage air pressure monitoring according to claim 6, wherein when the time nodes recorded as the descending nodes are connected in the risk section, the spatial superposition pressure value corresponding to the starting time node of the risk section is used as a reference value of a continuous increasing track, and the pressure increasing direction of each time node in the risk section is kept consistent under a unified time reference.
8. The automatic triggering method for emergency pressure relief of ring main unit with linkage air pressure monitoring according to claim 6, wherein the pre-triggering control of the emergency pressure relief action according to the risk accumulation curve comprises the following steps: reading accumulated values corresponding to time nodes of a risk accumulation curve, determining that the shock wave completes one-time propagation and refocuses and overlaps corresponding time spans by combining the duration time of a risk section in a shock wave cancellation risk time sequence result and the shock wave propagation rhythm presented by a space overlapping pressure evolution diagram, and marking a propagation period time window in the risk accumulation curve; Node-by-node comparison is carried out according to the accumulated value of the risk accumulation curve and a preset risk triggering reference, and when the accumulated value reaches the risk triggering reference and the time node is positioned in a propagation period time window, an emergency pressure relief starting instruction is sent out; And starting the pressure relief starting process according to the time sequence from the time node sending the emergency pressure relief starting instruction.
9. The automatic triggering method for emergency pressure relief of a ring main unit for linkage air pressure monitoring according to claim 8, wherein a time node for sending an emergency pressure relief starting command is located in a continuous growth stage of a risk accumulation curve and is located in a propagation period time window corresponding to a shock wave destructive risk time sequence result.
10. An automatic emergency pressure release triggering system of a ring main unit for linkage air pressure monitoring, which is used for realizing the automatic emergency pressure release triggering method of the ring main unit for linkage air pressure monitoring according to any one of claims 1-9, and is characterized by comprising a multipoint phase analysis module, a cancellation section identification module, a pressure superposition reconstruction module, a risk accumulation construction module and a front trigger control module; The multi-point phase analysis module is used for collecting air pressure time series data of a plurality of collecting points at the moment of arc faults in the ring main unit, and carrying out phase difference analysis on the air pressure time series data of the plurality of collecting points under a unified time reference to generate a pressure phase distribution diagram reflecting the change of the propagation direction of the shock wave; The cancellation section identification module is used for synchronously comparing the pressure change directions of a plurality of acquisition points at adjacent moments based on the pressure phase distribution diagram, extracting phase reversal sections with opposite pressure change directions and forming a shock wave cancellation risk time sequence result; the pressure superposition reconstruction module is used for carrying out superposition reconstruction on the pressure amplitude values of a plurality of acquisition points according to the time sequence result of the destructive risk of the shock waves to obtain a spatial superposition pressure evolution diagram; the risk accumulation construction module is used for carrying out continuous incremental judgment on the pressure increase rate based on the space superposition pressure evolution graph, bringing a transient descent interval corresponding to the impact wave destructive risk time sequence result into an integral pressure increase sequence, and constructing an uninterruptible risk accumulation curve; and the pre-trigger control module is used for performing pre-trigger control on the emergency pressure relief action according to the risk accumulation curve, and completing pressure relief starting before the shock waves are concentrated and overlapped again.

Description

Automatic triggering method and system for emergency pressure relief of ring main unit with linkage air pressure monitoring function Technical Field The invention relates to the technical field of ring main units, in particular to a method and a system for automatically triggering emergency pressure relief of a ring main unit in linkage air pressure monitoring. Background The emergency pressure release automatic triggering of the ring main unit refers to a passive or semi-active safety protection mechanism which is used for enabling a pressure release channel, a pressure release cover plate or a flow guide structure at the bottom or the rear part to be automatically opened after a set triggering condition is reached through a preset mechanical structure or electrical control logic when gas is instantaneously ionized and expanded and the pressure in a shell rises sharply in a very short time due to short-circuit arc, insulation breakdown, misoperation of a switch or internal faults in the ring main unit, and rapidly releasing high-temperature and high-pressure gas in a set direction, so that personnel injury caused by explosion of a main unit body and external spraying of flashover is avoided. The automatic triggering of the emergency pressure relief of the ring main unit for linkage air pressure monitoring is to increase a real-time air pressure sensing unit on the basis of a traditional pressure relief structure, continuously collect a static pressure basic value and a transient pressure change rate in the ring main unit, immediately drive an electromagnetic unlocking mechanism or a blasting pressure relief assembly to act in advance when detecting that a pressure increase slope exceeds a set threshold value or the transient pressure value reaches a dangerous interval, realize the transition from simple structure breaking type pressure relief to active triggering type pressure relief based on dynamic pressure criteria, thereby shortening response time, reducing a stress peak value of a shell structure, guiding an electric arc energy release process to a safety direction and improving the intrinsic safety level of the ring main unit in an internal electric arc fault scene. The prior art has the following defects: When arc faults occur in the ring main unit, arc energy can be intensively released in a very short time, shock waves which are spread in multiple directions are formed in a limited space, and reflection and superposition are continuously generated in the ring main unit. When the shock wave generates a phase difference in the space propagation process, the phenomenon that the wave crest and the wave trough are mutually counteracted can occur at the position of the sensing unit, so that the local pressure signal is reduced in a short time. At this time, the pressure curve collected by the system will show a stepwise falling trend, so that the judging condition that is originally close to the triggering threshold is temporarily released, and the pressure release triggering action is delayed. Then, in the next propagation period, the shock waves reflected by multiple paths are overlapped again and act on the structurally weak area of the cabinet body in a concentrated mode, so that the local pressure quickly rises to the limit value in a very short time, and finally, the explosion accident of the cabinet body can be possibly caused, and serious safety risks exist. The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to provide a method and a system for automatically triggering emergency pressure relief of a ring main unit in linkage air pressure monitoring, which are used for solving the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the automatic triggering method for emergency pressure relief of the ring main unit for monitoring the linkage air pressure comprises the following steps: At the moment of arc fault in the ring main unit, acquiring air pressure time series data of a plurality of acquisition points, and performing phase difference analysis on the air pressure time series data of the plurality of acquisition points under a unified time reference to generate a pressure phase distribution diagram reflecting the change of the propagation direction of the shock wave; based on the pressure phase distribution diagram, synchronously comparing the pressure change directions of a plurality of acquisition points at adjacent moments, extracting phase inversion regions with opposite pressure change directions, and forming a shock wave cancellation risk time sequence result; Overlapping and reconstructing the pressure amplitudes of a plurality of acquisition poin