A method for generating safety measures for secondary AC current circuits in a substation based on the connection status of cables in a loop model

Abstract

The present invention provides a method for generating safety measures for the secondary AC current loop of a substation based on the connection state of a loop model cable. This method parses the logic model file of the power transmission and transformation project, identifies the current loop connection relationship in the secondary loop model of the substation, dynamically differentiates between working switch cabinets and non-working switch cabinets, analyzes the current loop connection state between the two, and automatically determines the detailed type of the current loop according to the working type, loop energization state, switch cabinet position (end switch cabinet or intermediate switch cabinet), and series connection relationship. For each type, a preset safety measure logic is matched to generate standardized safety measures including steps such as disconnecting the link, short-circuiting the terminal, and sealing the operation. The present invention solves the problems of low manual identification efficiency and easy errors, significantly improves the safety and standardization level of the maintenance and repair of the secondary current loop of the substation, and reduces the operation risk of the power system.

Description

Technical Field

[0001] The present invention relates to the technical field of substation safety, and particularly to a method for generating safety measures for the secondary AC current circuit of a substation based on the connection state of the circuit model cable. Background Art

[0002] When secondary work is carried out at the substation site, since it is necessary to apply a test current to the secondary AC current circuit, it is necessary to prevent the debugging process from affecting the operating equipment, and it is necessary to execute safety measures on the secondary AC current circuit to safely isolate the secondary AC current circuit in the working range from the secondary AC current circuit of the operating equipment. Therefore, generating safety measures for the secondary AC current circuit is an important link before the work is carried out.

[0003] Currently, in the process of writing the safety measures content for the secondary AC current circuit, there are the following problems in the processing of the execution points of the safety measures for the secondary AC current circuit:

[0004] 1. The current writing of safety measures mainly relies on manual operation, and it is necessary for staff to manually analyze and write safety measures according to experience and on-site conditions. This method not only has low efficiency, but also is prone to inaccurate or incomplete safety measures due to human negligence or errors, increasing the operation risk.

[0005] 2. The connection relationship of the secondary AC current circuit in the substation is complex and changeable, and it is very difficult to manually integrate this information to formulate comprehensive safety measures. The dispersion and incompleteness of information may lead to incomplete formulation of safety measures, missing key isolation points or measures.

[0006] 3. The safety measures written manually often lack unified standards and formats, and there may be differences in the measures written by different personnel. This not only increases the difficulty of understanding and implementation, but also may lead to inconsistent implementation of safety measures, affecting the safety effect. In addition, the lack of standardization may also lead to ineffective comparison and optimization of safety measures in different substations or at different time points.

[0007] 4. With the development of technology and the replacement of personnel, the operation and maintenance knowledge of the substation needs to be continuously updated and inherited. The method of manually writing safety measures may not be able to effectively record and transfer best practices, and new employees may take a long time to become familiar with and master relevant operations, which affects the work efficiency and the implementation quality of safety measures.

[0008] Therefore, a method for generating safety measures for the secondary AC current circuit of a substation based on the connection state of the circuit model cable is proposed to solve the above problems. Summary of the Invention

[0009] In view of this, the object of the present invention is to provide a method for generating safety measures for the secondary AC current circuit of a substation based on the connection state of the loop model cable, aiming at the above-mentioned defects existing in the prior art, so as to improve the safety and identification efficiency of the secondary AC current circuit of the substation. By accurately distinguishing between working switch cabinets and non-working switch cabinets and automatically matching corresponding safety measures, the errors and risks of manual operation are reduced, ensuring the stable operation of the power system and the safety of personnel.

[0010] The technical solution adopted by the present invention is as follows:

[0011] A method for generating safety measures for the secondary AC current circuit of a substation based on the connection state of the loop model cable, comprising the following steps:

[0012] Obtain the logic model file of the power transmission and transformation project, parse the model file, and extract the secondary system model of the substation and the connection relationship of the secondary current circuit.

[0013] Furthermore, the secondary system model of the substation includes: switch cabinet model, secondary device model, secondary device board model, secondary device board terminal model, secondary winding terminal model of the current transformer, terminal section model, terminal piece model, and terminal piece terminal model.

[0014] Furthermore, the secondary device board model includes: the secondary winding terminal model of the current transformer inside the secondary device board and the secondary current circuit connection relationship between the secondary winding terminal of the current transformer inside the secondary device board and the secondary device board terminal.

[0015] Furthermore, the secondary current circuit connection relationship includes: the voltage circuit connection relationship between the secondary device board terminal and the terminal piece terminal, the secondary current circuit connection relationship between the secondary winding terminal of the current transformer and the terminal piece terminal, and the secondary current circuit connection relationship between the terminal piece terminals.

[0016] Preferably, according to the secondary current circuit connection relationship, construct a full secondary current circuit connection relationship that starts from the secondary winding terminal of the current transformer at the polarity end, passes through the secondary device board terminal and the terminal piece terminal, and finally returns to the secondary winding terminal of the current transformer at the non-polarity end.

[0017] When substation field work is carried out, set the type of substation work, and the type of substation work includes maintenance work and calibration work. According to the on-site work scope, determine the switch cabinets with work as working switch cabinets and the rest as non-working switch cabinets. Traverse the terminal piece terminals of the working switch cabinets to find the secondary current circuit connection relationship between them and the terminal piece terminals of the non-working switch cabinets, and construct a set of all secondary current circuit connection relationships of the working switch cabinets to the outside.

[0018] For each secondary current circuit connection relationship, first determine whether the secondary current circuit is a live secondary current circuit or a non-live secondary current circuit according to the working type. Secondly, determine whether it is the end screen of the current or the intermediate screen of the current according to the position of the working cabinet in the secondary current circuit connection relationship. Then, determine whether it is single-phase current or three-phase current according to the number of current phases in the secondary current circuit connection relationship.

[0019] According to the judgment results, the secondary current circuit is classified into the following six sub-types:

[0020] ① Non-live, end screen, single-phase or three-phase current;

[0021] ② Non-live, intermediate screen, single-phase current;

[0022] ③ Non-live, intermediate screen, three-phase current;

[0023] ④ Live, end screen, single-phase or three-phase current;

[0024] ⑤ Live, intermediate screen, single-phase current;

[0025] ⑥ Live, intermediate screen, three-phase current.

[0026] Furthermore, according to the connection relationships of all secondary current circuits external to the working cabinet in the previous step, for each connection relationship of the secondary current circuit external to the working cabinet, find the terminal piece connection terminal A in the working cabinet that constructs the external secondary current circuit connection.

[0027] Furthermore, based on the terminal piece connection terminal A, find all the connection relationships of the entire secondary current circuit passing through the terminal piece connection terminal A, and determine whether the working cabinet is located in the first screen cabinet or the last screen cabinet of the entire secondary current circuit in the connection relationship of the entire secondary current circuit:

[0028] Preferably, if the working cabinet is not in the first screen cabinet or the last screen cabinet in any connection relationship of the entire secondary current circuit, then determine the corresponding external secondary current circuit of the working cabinet as the intermediate screen. Along the current direction, the current inflow direction is called the current input side, and the current outflow direction is called the current output side.

[0029] Preferably, if the working cabinet is in the first screen cabinet or the last screen cabinet in each connection relationship of the entire secondary current circuit, then determine the corresponding external secondary current circuit of the working cabinet as the end screen.

[0030] Furthermore, according to the connection relationships of all secondary current circuits external to the working cabinet in the previous step, for each connection relationship of the secondary current circuit external to the working cabinet, find the terminal piece connection terminal A in the working cabinet that constructs the external secondary current circuit connection.

[0031] Further, based on the terminal strip wiring terminal A, search for the connection relationship of the secondary current loop composed of the terminal strip wiring terminal A, and determine whether there is only one phase among the phases constituting the connection relationship of the secondary current loop:

[0032] Preferably, if the connection relationship of the secondary current loop composed of the terminal strip wiring terminal A only includes single-phase, covering various single-phase current loop connection relationships such as A-N, B-N, C-N, and L-N, then the corresponding external secondary current loop of the working switchgear cabinet is determined as single-phase current.

[0033] Preferably, if the connection relationship of the secondary current loop composed of the terminal strip wiring terminal A does not only include single-phase, covering various polyphase current loop connection relationships such as A-B-C-N, A-B-N, A-C-N, and B-C-N, then the corresponding external secondary current loop of the working switchgear cabinet is determined as three-phase current.

[0034] For each sub-type of the connection relationship of the secondary current loop, according to whether the current in the connection relationship of the secondary current loop passes through the device in the switchgear cabinet, determine whether each current passes through the secondary device in the switchgear cabinet.

[0035] Further, according to all the external secondary current loop connection relationships of the working switchgear cabinet in the previous step, for each external secondary current loop connection relationship of the working switchgear cabinet, find a set B of multiple terminal strip wiring terminals that construct the external secondary current loop connection in the working switchgear cabinet.

[0036] Further, based on the set B of terminal strip wiring terminals, for each terminal strip wiring terminal therein, search for the full connection relationship of the secondary current loop of each terminal strip, and determine whether it passes through the working device in the working switchgear cabinet in the full connection relationship of the secondary current loop:

[0037] Preferably, in the set B of terminal strip wiring terminals, if the set C of terminal strip wiring terminals therein passes through the working device in the working switchgear cabinet, then the set C of terminal strip wiring terminals is called the terminal passing through the working device.

[0038] Preferably, in the set B of terminal strip wiring terminals, if the set D of terminal strip wiring terminals therein does not pass through the working device in the working switchgear cabinet, then the set D of terminal strip wiring terminals is called the terminal not passing through the working device.

[0039] According to the sub-type of the connection relationship of the secondary current loop of the working switchgear cabinet and whether each current passes through the secondary device in the switchgear cabinet, automatically generate corresponding safety measures.

[0040] Preferably, for the connection relationship of the secondary current circuit of uncharged, end screen, single-phase or three-phase current, the first step of the safety measure is to disconnect the terminal connecting piece of the terminal piece of the working switchgear cabinet, and the second step is to seal the terminal connection terminal of the non-working side of the terminal piece of the working switchgear cabinet.

[0041] Preferably, for the connection relationship of the secondary current circuit of uncharged, intermediate screen, single-phase current, the first step of the safety measure is to disconnect the terminal connecting piece of the current input side terminal piece of the working switchgear cabinet, the second step is to disconnect the terminal connecting piece of the current output side terminal piece of the working switchgear cabinet, the third step is to seal the terminal connection terminal of the non-working side of the current input side terminal piece of the working switchgear cabinet, and the fourth step is to seal the terminal connection terminal of the non-working side of the current output side terminal piece of the working switchgear cabinet.

[0042] Preferably, for the connection relationship of the secondary current circuit of uncharged, intermediate screen, three-phase current, the first step of the safety measure is to disconnect the terminal connecting piece of the current input side terminal piece of the working switchgear cabinet, the second step is to disconnect the terminal connecting piece of the current output side terminal piece of the working switchgear cabinet, the third step is to short-circuit the terminal connection terminal of the current output side terminal piece of the working switchgear cabinet close to the working device side of the working switchgear cabinet, the fourth step is to seal the terminal connection terminal of the non-working side of the current input side terminal piece of the working switchgear cabinet, and the fifth step is to seal the terminal connection terminal of the non-working side of the current output side terminal piece of the working switchgear cabinet.

[0043] Preferably, for the connection relationship of the secondary current circuit of charged, end screen, single-phase or three-phase current, the first step of the safety measure is to short-circuit the terminal connection terminal of the non-working side of the terminal piece of the working switchgear cabinet, the second step is to disconnect the terminal connecting piece of the terminal piece of the working switchgear cabinet, and the third step is to seal the terminal connection terminal of the non-working side of the terminal piece of the working switchgear cabinet.

[0044] Preferably, for the connection relationship of the secondary current circuit of charged, intermediate screen, single-phase current, the first step of the safety measure is to phase-by-phase bridge the terminal connection terminals of the non-working side of the current input side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals) to the terminal connection terminals of the non-working side of the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). For those not passing through the working device terminals, there is no need to phase-by-phase bridge. The second step is to open the terminal connecting piece of the current input side terminal piece of the working switchgear cabinet (and meet the requirement of passing through the working device terminals), the third step is to open the terminal connecting piece of the current output side terminal piece of the working switchgear cabinet (and meet the requirement of passing through the working device terminals), the fourth step is to seal the terminal connection terminals of the non-working side of the current input side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals), and the fifth step is to seal the terminal connection terminals of the non-working side of the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals).

[0045] Preferably, for the connection relationship of the secondary current circuit of live, intermediate panel, and three-phase current, the first step of the safety measure is to phase-by-phase bridge the terminal strip connection terminals on the non-working side of the current input side of the working panel cabinet (and satisfy passing through the working device terminals) to the terminal strip connection terminals on the non-working side of the current output side of the working panel cabinet (and satisfy passing through the working device terminals). For those not passing through the working device terminals, there is no need to phase-by-phase bridge. The second step is to open the terminal connection piece of the terminal strip on the current input side of the working panel cabinet (and satisfy passing through the working device terminals). The third step is to open the terminal connection piece of the terminal strip on the current output side of the working panel cabinet (and satisfy passing through the working device terminals). The fourth step is to short-circuit the terminal strip connection terminals on the current output side of the working panel cabinet close to the working device of the working panel cabinet (and satisfy passing through the working device terminals). The fifth step is to seal the terminal strip connection terminals on the non-working side of the current input side of the working panel cabinet (and satisfy passing through the working device terminals). The sixth step is to seal the terminal strip connection terminals on the non-working side of the current output side of the working panel cabinet (and satisfy passing through the working device terminals).

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] The embodiment of the present invention provides a method for generating safety measures for the secondary AC current circuit of a substation based on the connection state of loop model cables, including: by parsing the logic model file of the power transmission and transformation project, identifying the current circuit connection relationship in the secondary circuit model of the substation, dynamically distinguishing the working panel cabinet and the non-working panel cabinet, analyzing the current circuit connection state between the two, and automatically judging the detailed type of the current circuit according to the working type, loop live state, panel cabinet position (end panel or intermediate panel), and series connection relationship. For each type, match the preset safety measure logic to generate standardized safety measures including steps such as disconnecting the connection piece, short-circuiting the terminal, and sealing operation. The present invention solves the problems of low manual identification efficiency and easy error, significantly improves the safety and standardization level of the maintenance and repair of the secondary current circuit of the substation, and reduces the operation risk of the power system. Description of the Drawings

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only the preferred embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0049] Figure 1 It is a schematic implementation flowchart of a method for generating safety measures for the secondary AC current circuit of a substation based on the connection state of loop model cables provided by the embodiment of the present invention;

[0050] Figure 2It is a schematic diagram of safety measures for the secondary current circuit with no power supply, end panel, single-phase or three-phase current in the substation secondary AC current circuit safety measure generation method based on the loop model cable connection status provided by the embodiment of the present invention;

[0051] Figure 3 It is a schematic diagram of safety measures for the secondary current circuit with no power supply, middle panel, single-phase current in the substation secondary AC current circuit safety measure generation method based on the loop model cable connection status provided by the embodiment of the present invention;

[0052] Figure 4 It is a schematic diagram of safety measures for the secondary current circuit with no power supply, middle panel, three-phase current in the substation secondary AC current circuit safety measure generation method based on the loop model cable connection status provided by the embodiment of the present invention;

[0053] Figure 5 It is a schematic diagram of safety measures for the secondary current circuit with power supply, end panel, single-phase or three-phase current in the substation secondary AC current circuit safety measure generation method based on the loop model cable connection status provided by the embodiment of the present invention;

[0054] Figure 6 It is a schematic diagram of safety measures for the secondary current circuit with power supply, middle panel, single-phase current in the substation secondary AC current circuit safety measure generation method based on the loop model cable connection status provided by the embodiment of the present invention;

[0055] Figure 7 It is a schematic diagram of safety measures for the secondary current circuit with power supply, middle panel, three-phase current in the substation secondary AC current circuit safety measure generation method based on the loop model cable connection status provided by the embodiment of the present invention. Detailed implementation manners

[0056] The principles and features of the present invention will be described below with reference to the accompanying drawings. The listed embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0057] Please refer to Figures 1-7 , the embodiment of the present invention provides a method for generating safety measures for the secondary AC current circuit of a substation based on the loop model cable connection status, including the following steps:

[0058] S101: Obtain the logical model file of the power transmission and transformation project, parse the model file, and extract the substation secondary system model and the connection relationship of the secondary current circuit.

[0059] Preferably, S101 includes:

[0060] The secondary system model of a substation includes: panel model, secondary device model, secondary device board model, secondary device board terminal model, current transformer secondary winding terminal model, terminal section model, terminal piece model, and terminal piece terminal model.

[0061] The secondary device board model includes: the current transformer winding terminal model inside the secondary device board and the secondary current loop connection relationship between the current transformer winding terminal inside the secondary device board and the secondary device board terminal.

[0062] The secondary current loop connection relationship includes: the voltage loop connection relationship between the secondary device board terminal and the terminal piece terminal, the secondary current loop connection relationship between the current transformer secondary winding terminal and the terminal piece terminal, and the secondary current loop connection relationship between the terminal piece terminals.

[0063] According to the secondary current loop connection relationship, construct the secondary current full-loop connection relationship that starts from the current transformer secondary winding terminal at the polar end, passes through the secondary device board terminal and the terminal piece terminal, and finally returns to the current transformer secondary winding terminal at the non-polar end.

[0064] S102: When substation on-site substation work is carried out, set the type of substation work. The types of substation work include maintenance work and calibration work. According to the on-site work scope, determine the panels with work as working panels and the rest as non-working panels. Traverse the terminal piece terminals of the working panels to find the secondary current loop connection relationship between them and the terminal piece terminals of the non-working panels, and construct the set of all secondary current loop connection relationships outside the working panels.

[0065] S103: For each secondary current loop connection relationship, first determine whether the secondary current loop is a live secondary current loop or a non-live secondary current loop according to the work type, then determine whether it is a current end panel or a current middle panel according to the position of the working panel in the secondary current loop connection relationship, and then determine whether it is a single-phase current or a three-phase current according to the current phase number in the secondary current loop connection relationship.

[0066] Preferably, S103 includes:

[0067] According to all the secondary current loop connection relationships outside the working panels in the previous step, for each secondary current loop connection relationship outside the working panels, find the terminal piece terminal A in the working panel that constructs the secondary current loop connection outside.

[0068] Based on terminal block wiring terminal A, find all the full secondary current loop connection relationships passing through terminal block wiring terminal A, and determine whether the working switchgear cabinet is located in the first or last switchgear cabinet of the full secondary current loop in the full secondary current loop connection relationship:

[0069] If in any full secondary current loop connection relationship, the working switchgear cabinet is not in the first or last switchgear cabinet, then determine the corresponding external secondary current loop of the working switchgear cabinet as an intermediate screen. Along the current direction, the current inflow direction is called the current input side, and the current outflow direction is called the current output side.

[0070] If in each full secondary current loop connection relationship, the working switchgear cabinet is in the first or last switchgear cabinet, then determine the corresponding external secondary current loop of the working switchgear cabinet as an end screen.

[0071] According to all the external secondary current loop connection relationships of the working switchgear cabinet in the previous step, for each external secondary current loop connection relationship of the working switchgear cabinet, find the terminal block wiring terminal A in the working switchgear cabinet that constructs the external secondary current loop connection.

[0072] Based on terminal block wiring terminal A, find the secondary current loop connection relationship composed of terminal block wiring terminal A, and determine whether there is only one phase in the phase types that make up the secondary current loop connection relationship:

[0073] If the secondary current loop connection relationship composed of terminal block wiring terminal A only contains single-phase, covering various single-phase current loop connection relationships such as A-N, B-N, C-N, L-N, then determine the corresponding external secondary current loop of the working switchgear cabinet as single-phase current.

[0074] If the secondary current loop connection relationship composed of terminal block wiring terminal A does not only contain single-phase, covering various polyphase current loop connection relationships such as A-B-C-N, A-B-N, A-C-N, B-C-N, then determine the corresponding external secondary current loop of the working switchgear cabinet as three-phase current.

[0075] S104: For each sub-type of secondary current loop connection relationship, according to whether the current in the secondary current loop connection relationship passes through a device in the switchgear cabinet, determine whether each current passes through the secondary device in the switchgear cabinet.

[0076] Preferably, S104 includes:

[0077] According to all the external secondary current loop connection relationships of the working switchgear cabinet in the previous step, for each external secondary current loop connection relationship of the working switchgear cabinet, find a set B of multiple terminal block wiring terminals in the working switchgear cabinet that constructs the external secondary current loop connection.

[0078] Based on the terminal strip wiring terminal set B, for each terminal strip wiring terminal therein, search for the full-loop connection relationship of the secondary current of each terminal strip, and determine whether it passes through the working device in the working switchgear in the full-loop connection relationship of the secondary current:

[0079] In the terminal strip wiring terminal set B, if the terminal strip wiring terminal set C therein passes through the working device in the working switchgear, then the terminal strip wiring terminal set C is called a terminal passing through the working device.

[0080] In the terminal strip wiring terminal set B, if the terminal strip wiring terminal set D therein does not pass through the working device in the working switchgear, then the terminal strip wiring terminal set D is called a terminal not passing through the working device.

[0081] S105: Automatically generate corresponding safety measures according to the subdivision type of the secondary current loop connection relationship of the working switchgear and whether each current passes through the secondary device in the switchgear.

[0082] Preferably, S105 includes: Specifically includes:

[0083] For the secondary current loop connection relationship of uncharged, end panel, single-phase or three-phase current, the first step of the safety measure is to disconnect the terminal connection piece of the terminal strip of the working switchgear, and the second step is to seal the terminal strip wiring terminal on the non-working side of the terminal strip of the working switchgear.

[0084] For the secondary current loop connection relationship of uncharged, intermediate panel, single-phase current, the first step of the safety measure is to disconnect the terminal connection piece of the terminal strip on the current input side of the working switchgear, the second step is to disconnect the terminal connection piece of the terminal strip on the current output side of the working switchgear, the third step is to seal the terminal strip wiring terminal on the non-working side of the terminal strip on the current input side of the working switchgear, and the fourth step is to seal the terminal strip wiring terminal on the non-working side of the terminal strip on the current output side of the working switchgear.

[0085] For the secondary current loop connection relationship of uncharged, intermediate panel, three-phase current, the first step of the safety measure is to disconnect the terminal connection piece of the terminal strip on the current input side of the working switchgear, the second step is to disconnect the terminal connection piece of the terminal strip on the current output side of the working switchgear, the third step is to short-circuit the terminal strip wiring terminal on the side close to the working device of the terminal strip on the current output side of the working switchgear, the fourth step is to seal the terminal strip wiring terminal on the non-working side of the terminal strip on the current input side of the working switchgear, and the fifth step is to seal the terminal strip wiring terminal on the non-working side of the terminal strip on the current output side of the working switchgear.

[0086] For the secondary current loop connection relationship of charged, end panel, single-phase or three-phase current, the first step of the safety measure is to short-circuit the terminal strip wiring terminal on the non-working side of the terminal strip of the working switchgear, the second step is to disconnect the terminal connection piece of the terminal strip of the working switchgear, and the third step is to seal the terminal strip wiring terminal on the non-working side of the terminal strip of the working switchgear.

[0087] For the connection relationship of the secondary current circuit of live, intermediate screen, and single-phase current, the first step of the safety measure is to phase-by-phase jumper the terminal strip connection terminals on the non-working side of the current input side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals) to the terminal strip connection terminals on the non-working side of the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). For those not passing through the working device terminals, there is no need to phase-by-phase jumper. The second step is to open the terminal connection piece of the terminal strip on the current input side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). The third step is to open the terminal connection piece of the terminal strip on the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). The fourth step is to seal the terminal strip connection terminals on the non-working side of the current input side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). The fifth step is to seal the terminal strip connection terminals on the non-working side of the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals).

[0088] For the connection relationship of the secondary current circuit of live, intermediate screen, and three-phase current, the first step of the safety measure is to phase-by-phase jumper the terminal strip connection terminals on the non-working side of the current input side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals) to the terminal strip connection terminals on the non-working side of the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). For those not passing through the working device terminals, there is no need to phase-by-phase jumper. The second step is to open the terminal connection piece of the terminal strip on the current input side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). The third step is to open the terminal connection piece of the terminal strip on the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). The fourth step is to short-circuit the terminal strip connection terminals near the working device of the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). The fifth step is to seal the terminal strip connection terminals on the non-working side of the current input side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals). The sixth step is to seal the terminal strip connection terminals on the non-working side of the current output side of the working switchgear cabinet (and meet the requirement of passing through the working device terminals).

[0089] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for generating safety measures for the secondary AC current circuit of a substation based on the connection state of a circuit model cable, characterized in that It includes the following steps: Obtain the logical model file of the power transmission and transformation project, parse the model file, and extract the secondary system model of the substation and the connection relationship of the secondary current loop. The extraction of the secondary system model of the substation and the connection relationship of the secondary current loop includes: The secondary system model of the substation includes: the panel model, the secondary device model, the secondary device board model, the wiring terminal model of the secondary device board, the wiring terminal model of the secondary winding of the current transformer, the terminal section model, the terminal piece model, and the wiring terminal model of the terminal piece; The secondary device board model includes: the wiring terminal model of the current transformer winding inside the secondary device board and the connection relationship of the secondary current loop between the wiring terminal of the current transformer winding inside the secondary device board and the wiring terminal of the secondary device board; The connection relationship of the secondary current loop includes: the connection relationship of the voltage loop between the wiring terminal of the secondary device board and the wiring terminal of the terminal piece, the connection relationship of the secondary current loop between the wiring terminal of the secondary winding of the current transformer and the wiring terminal of the terminal piece, and the connection relationship of the secondary current loop between the wiring terminal of the terminal piece and the wiring terminal of the terminal piece; According to the connection relationship of the secondary current loop, construct the connection relationship of the full secondary current loop that starts from the wiring terminal of the secondary winding of the current transformer at the polar end, passes through the wiring terminal of the secondary device board and the wiring terminal of the terminal piece, and finally returns to the wiring terminal of the secondary winding of the current transformer at the non-polar end; When there is substation work on site, set the type of substation work. The type of substation work includes maintenance work and calibration work. According to the on-site work scope, determine the panels with work as working panels and the rest as non-working panels. Traverse the wiring terminals of the terminal pieces of the working panels to find the connection relationship of the secondary current loop between them and the wiring terminals of the terminal pieces of the non-working panels, and construct the set of all connection relationships of the secondary current loops outside the working panels; For each connection relationship of the secondary current loop, first judge whether the secondary current loop is a live secondary current loop or a non-live secondary current loop according to the type of work, and then judge whether it is the end screen of the current or the intermediate screen of the current according to the position of the working panel in the connection relationship of the secondary current loop. The judgment of whether it is the end screen of the current or the intermediate screen of the current includes: According to all the connection relationships of the secondary current loops outside the working panels, for each connection relationship of the secondary current loop outside the working panel, find the wiring terminal A of the terminal piece in the working panel that constructs the connection relationship of the secondary current loop outside; Based on the wiring terminal A of the terminal piece, find all the connection relationships of the full secondary current loops passing through the wiring terminal A of the terminal piece, and judge whether the working panel is located in the first panel or the last panel of the full secondary current loop in the connection relationship of the full secondary current loop; If in any connection relationship of the full secondary current loop, the working panel is not in the first panel or the last panel, then judge the corresponding connection relationship of the secondary current loop outside the working panel as the intermediate screen, and along the current direction, call the current inflow direction the current input side and the current outflow direction the current output side; If the working switchgear cabinet is the first or the last switchgear cabinet in each secondary current full-loop connection relationship, then the corresponding external secondary current loop of the working switchgear cabinet is determined as the end switchgear cabinet. Then, according to the number of current phases in the secondary current loop connection relationship, it is determined whether it is single-phase current or three-phase current. The determination of whether it is single-phase current or three-phase current includes: Based on all the external secondary current loop connection relationships of the working switchgear cabinet, for each external secondary current loop connection relationship of the working switchgear cabinet, find the terminal strip connection terminal A in the working switchgear cabinet that constructs the external secondary current loop connection; Based on the terminal strip connection terminal A, search for the secondary current loop connection relationship composed of the terminal strip connection terminal A, and determine whether the phase types constituting the secondary current loop connection relationship are only one phase: If the secondary current loop connection relationship composed of the terminal strip connection terminal A only contains single-phase, covering various single-phase current loop connection relationships such as A-N, B-N, C-N, and L-N, then the corresponding external secondary current loop of the working switchgear cabinet is determined as single-phase current; If the secondary current loop connection relationship composed of the terminal strip connection terminal A does not only contain single-phase, covering various polyphase current loop connection relationships such as A-B-C-N, A-B-N, A-C-N, and B-C-N, then the corresponding external secondary current loop of the working switchgear cabinet is determined as three-phase current. According to the judgment result, the secondary current loop is classified into the following six sub-types: ① Not energized, end switchgear cabinet, single-phase or three-phase current; ② Not energized, intermediate switchgear cabinet, single-phase current; ③ Not energized, intermediate switchgear cabinet, three-phase current; ④ Energized, end switchgear cabinet, single-phase or three-phase current; ⑤ Energized, intermediate switchgear cabinet, single-phase current; ⑥ Energized, intermediate switchgear cabinet, three-phase current; For each sub-type of the secondary current loop connection relationship, according to whether the current in the secondary current loop connection relationship passes through the device in the switchgear cabinet, it is determined whether each current passes through the secondary device in the switchgear cabinet. Specifically: Based on all the external secondary current loop connection relationships of the working switchgear cabinet, for each external secondary current loop connection relationship of the working switchgear cabinet, find a set B of multiple terminal strip connection terminals in the working switchgear cabinet that construct the external secondary current loop connection; Based on the set B of terminal strip connection terminals, for each terminal strip connection terminal therein, search for the full-loop connection relationship of the secondary current of each terminal strip, and determine whether the working switchgear cabinet passes through the working device in the full-loop connection relationship of the secondary current: In the set B of terminal strip connection terminals, if the set C of terminal strip connection terminals therein passes through the working device in the working switchgear cabinet, then the set C of terminal strip connection terminals is called the terminal passing through the working device; In the set B of terminal strip connection terminals, if the set D of terminal strip connection terminals therein does not pass through the working device in the working switchgear cabinet, then the set D of terminal strip connection terminals is called the terminal not passing through the working device; According to the subdivision types of the secondary current loop connection relationships of the working switchgear cabinets and whether each current passes through the secondary devices inside the cabinets, corresponding safety measures are automatically generated. Specifically: For the secondary current loop connection relationships of uncharged, end cabinets, single-phase or three-phase currents, the first step of the safety measure is to disconnect the terminal connection piece of the terminal piece of the working switchgear cabinet, and the second step is to seal the terminal connection terminal of the non-working side of the terminal piece of the working switchgear cabinet terminal piece; For the secondary current loop connection relationships of uncharged, intermediate cabinets, single-phase currents, the first step of the safety measure is to disconnect the terminal connection piece of the current input side terminal piece of the working switchgear cabinet, the second step is to disconnect the terminal connection piece of the current output side terminal piece of the working switchgear cabinet, the third step is to seal the terminal connection terminal of the non-working side of the current input side terminal piece of the working switchgear cabinet, and the fourth step is to seal the terminal connection terminal of the non-working side of the current output side terminal piece of the working switchgear cabinet; For the secondary current loop connection relationships of uncharged, intermediate cabinets, three-phase currents, the first step of the safety measure is to disconnect the terminal connection piece of the current input side terminal piece of the working switchgear cabinet, the second step is to disconnect the terminal connection piece of the current output side terminal piece of the working switchgear cabinet, the third step is to short-circuit the terminal connection terminal of the current output side terminal piece close to the working device side of the working switchgear cabinet, the fourth step is to seal the terminal connection terminal of the non-working side of the current input side terminal piece of the working switchgear cabinet, and the fifth step is to seal the terminal connection terminal of the non-working side of the current output side terminal piece of the working switchgear cabinet; For the secondary current loop connection relationships of charged, end cabinets, single-phase or three-phase currents, the first step of the safety measure is to short-circuit the terminal connection terminal of the non-working side of the terminal piece of the working switchgear cabinet, the second step is to disconnect the terminal connection piece of the terminal piece of the working switchgear cabinet, and the third step is to seal the terminal connection terminal of the non-working side of the terminal piece of the working switchgear cabinet; For the secondary current loop connection relationships of charged, intermediate cabinets, single-phase currents, the first step of the safety measure is to phase-by-phase bridge over the terminal connection terminals of the non-working side of the current input side of the working switchgear cabinet and satisfy passing through the working device terminals to the terminal connection terminals of the non-working side of the current output side of the working switchgear cabinet and satisfy passing through the working device terminals. For those not passing through the working device terminals, there is no need to phase-by-phase bridge over. The second step is to open the terminal connection piece of the current input side terminal piece of the working switchgear cabinet and satisfy passing through the working device terminals. The third step is to open the terminal connection piece of the current output side terminal piece of the working switchgear cabinet and satisfy passing through the working device terminals. The fourth step is to seal the terminal connection terminals of the non-working side of the current input side of the working switchgear cabinet and satisfy passing through the working device terminals. The fifth step is to seal the terminal connection terminals of the non-working side of the current output side of the working switchgear cabinet and satisfy passing through the working device terminals; For the connection relationship of the secondary current circuit of the live, intermediate screen, and three-phase current, the first step of the safety measures is to phase-by-phase bridge the terminal connection terminals on the non-working side of the current input side of the working switchgear cabinet and satisfy passing through the working device terminals to the terminal connection terminals on the non-working side of the current output side of the working switchgear cabinet and satisfy passing through the working device terminals. For those not passing through the working device terminals, there is no need to phase-by-phase bridge. The second step is to open the terminal connection piece of the terminal piece on the current input side of the working switchgear cabinet and satisfy passing through the working device terminals. The third step is to open the terminal connection piece of the terminal piece on the current output side of the working switchgear cabinet and satisfy passing through the working device terminals. The fourth step is to short-circuit the terminal connection terminals of the terminal piece on the current output side of the working switchgear cabinet close to the working device of the working switchgear cabinet and satisfy passing through the working device terminals. The fifth step is to seal the terminal connection terminals on the non-working side of the current input side of the working switchgear cabinet and satisfy passing through the working device terminals. The sixth step is to seal the terminal connection terminals on the non-working side of the current output side of the working switchgear cabinet and satisfy passing through the working device terminals.

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