A system and method for improving the reliability of non-electrical quantity protection

Abstract

The present invention provides a system and method for improving the reliability of non-electrical quantity protection, including a relay starting voltage classification subsystem and a non-electrical quantity protection subsystem; the relay starting voltage classification subsystem includes a relay classification device, a power module for powering the relay classification device, and a host computer for controlling the operation of the power module. The present invention combines the relay starting voltage classification with the non-electrical quantity protection to design a system for improving the reliability of the non-electrical quantity protection, which mainly lies in the design of the whole system. The system designs two subsystems, obtains a relay with a reasonable starting voltage range, makes the non-electrical quantity protection starting circuit have a higher starting reliability, and designs the non-electrical quantity protection subsystem based on the obtained relay to be installed.

Description

Technical Field

[0001] The invention belongs to the field of relay protection, and in particular relates to a system and method for improving the reliability of non-electrical quantity protection. Background Art

[0002] In order to ensure the safe and reliable operation of traction transformers on electrified railways, traction transformers are equipped with electrical and non-electrical protection. As an important supplement to electrical protection, the criteria for non-electrical protection are non-electrical quantities such as gas volume, flow rate, oil level, pressure, temperature, and oil level. Non-electrical protection mainly includes body light gas, body heavy gas, oil temperature is too high, pressure release, over-temperature tripping, etc. Among them, heavy gas protection, pressure release, over-temperature tripping, etc. have been used in conjunction with differential protection as transformer main transformer protection.

[0003] However, the non-electrical quantity signal of the external connection needs to be connected to the main transformer through a cable. If the cable is too long or the laying is unreasonable, the interference of high-order harmonic components can easily be introduced into the input of the non-electrical quantity protection through the distributed capacitance on the cable, eventually causing false operation; or, if a real fault occurs, although the non-electrical quantity signal is introduced into the non-electrical quantity protection, due to the unreasonable design of the non-electrical quantity protection plug-in, it will cause refusal to operate or false operation, which will have a significant impact on the safe operation of the traction power supply system.

[0004] Therefore, false operation or refusal to operate of non-electrical protection has become the primary factor affecting the reliability of traction transformers. Designers should fully realize the importance of non-electrical protection of traction transformers, and strive to improve the reliability, safety and stability of non-electrical protection, so as to provide guarantee for the safe and reliable operation of traction transformers on electrified railways. Summary of the invention

[0005] In view of this, the present invention aims to overcome the defects in the above-mentioned prior art and proposes a system and method for improving the reliability of non-electrical quantity protection.

[0006] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0007] A system for improving the reliability of non-electrical quantity protection, comprising a relay starting voltage classification subsystem and a non-electrical quantity protection subsystem:

[0008] The relay starting voltage classification subsystem includes a relay classification device, a power module for supplying power to the relay classification device, and a host computer for controlling the operation of the power module; the relay classification device is provided with a plurality of Tport test ports for installing the relays to be installed, and the host computer is connected to each Tport test port through a DC voltage acquisition module and a switch quantity acquisition module; the power module includes a DC source for supplying power to the relay classification device, and a programmable power switch for controlling the power on and off of each Tport test port, and the host computer is electrically connected to the programmable power switch;

[0009] The non-electrical quantity protection subsystem includes an outlet module and a signal feedback module arranged in parallel, and a non-electrical quantity input module for controlling the on and off of the two. One end of the outlet module is connected to the positive control mother +KM through the IJ-1 contact switch, and the other end is connected to the negative control mother -KM. One end of the signal feedback module is connected to the positive control mother +KM through the IJ-2 contact switch, and the other end is connected to the negative control mother -KM. The non-electrical quantity input module includes a non-electrical quantity input port, a power control submodule, a Class I relay submodule to be installed, a delay submodule 1 for controlling the delay of the Class I relay submodule to be installed, and a reset submodule for controlling the reset of the Class I relay submodule to be installed. The power control submodule is arranged in parallel with the Class I relay submodule to be installed. The Class I relay submodule to be installed includes a classified Class I relay and a series power resistor submodule 1 for adjusting the current or power of the non-electrical quantity input module. The delay submodule 1 and the reset submodule are connected to the Class I relay, and the opening and closing of the IJ-1 contact switch and the IJ-2 contact switch are both controlled by the Class I relay.

[0010] Furthermore, the outlet module includes an outlet relay, a delay submodule 2 for controlling the delay of the outlet relay, and a series power resistor submodule 2 for adjusting the current or power of the outlet module; the delay submodule 2 is connected to the outlet relay.

[0011] Furthermore, the signal feedback module includes a control relay, a signal relay, and a series power resistor submodule 3 for adjusting the current or power of the signal feedback module; the non-electrical input port is provided with a KJ contact switch for controlling the on and off of the non-electrical input port, and the KJ contact switch is controlled by the control relay.

[0012] A method for applying the system for improving the reliability of non-electrical quantity protection comprises:

[0013] S1. First, the relays to be installed are classified using the relay starting voltage classification subsystem; the relays to be installed are classified into Class I and Class II according to the starting voltage V level of the relays to be installed;

[0014] S2. Design the non-electrical quantity protection subsystem using the Class I relay obtained by classification;

[0015] S3. Design an outlet module, a non-electricity input module, and a signal feedback module in the non-electricity protection subsystem;

[0016] S4. Design and implement the control logic of the non-electricity protection subsystem for non-electricity protection;

[0017] S5. Use the improved particle swarm optimization algorithm to search for the optimal performance parameters of the non-electricity protection subsystem in S2;

[0018] S6. When the performance parameters of the non-electricity protection subsystem are optimal and stable, statistically input a large amount of performance parameter data into the relay starting voltage classification subsystem in step S1 to optimize the classification of the relays to be installed; through repeated iterative operations, achieve the optimal classification of the relays to be installed to improve the performance of the relay starting voltage classification subsystem and the non-electricity protection subsystem.

[0019] Further, in the step S1, the relay to be installed is a small-sized, polarized, double-coil magnetic latching power relay.

[0020] Further, the specific classification method of the relay starting voltage classification subsystem for the relay to be installed in the step S1 is as follows:

[0021] S11. Install n relays to be installed on the relay classification device;

[0022] S12. Use the relay intelligent classification software on the host computer to control the programmable power switch, so that the DC power supply adjusts the output voltage value step by step with v0, and the step period is set to t1;

[0023] S13. Determine the classification threshold V according to the voltage level of the non-electricity protection f , Class I relays are those with a starting voltage V greater than V f , and the rest are Class II;

[0024] S14. Start classification. The DC voltage acquisition module collects the voltage values of n Tports in real time, sets it to the synchronous sampling mode of n Tports, and the sampling period is t2; the digital input module dynamically monitors the contact position change of the relay, sets it to the polling mode, and the polling period is t3, which should satisfy t2 < t3 < t1. When the contact changes, the host computer immediately records the voltage value V uploaded by the current DC voltage acquisition module and locks the current Tport until all n Tports are classified.

[0025] Further, in the step S3, when the non-electricity input module operates, the power value of the power control sub-module should be greater than or equal to W1.

[0026] Furthermore, in step S4, the specific control logic of the non-electrical protection subsystem is:

[0027] When there is a non-electrical quantity signal input, the input power is greater than W1, and the input can be maintained until the delay submodule 1 delay t5 ends, then the Class I relay is actuated, the IJ-1 contact switch and the IJ-2 contact switch are closed, and the control relay and the signal relay are started; after the control relay is started, the control KJ contact switch is opened, so that the non-electrical quantity input module is powered off, and the power control submodule also stops working, reducing the power consumption of the non-electrical quantity protection subsystem. After the non-electrical quantity input module is powered off, all contacts remain in the current state; after the IJ-1 contact switch is closed, after the delay submodule 2 delay t6, the output relay is started, and at this time, the output can be exported through the output relay contacts;

[0028] When there is external interference input, the input energy of the interference is less than W1, or it fails to last until the delay t5 of the delay submodule 1 ends, then the Class I relay will not start.

[0029] Furthermore, in step S5, the specific method of improving the particle swarm optimization algorithm to search for the optimal performance parameters of the non-electrical protection subsystem in step S2 is as follows:

[0030] S51, obtaining the total time t7 from the start of the Class I relay to the start of the outlet relay, t7 is equal to the sum of the Class I relay action times t0, t4, t5 and t6, and setting t7 as a feature vector;

[0031] S52, set the search time interval (T QL ,T QH ), initialize particle position, velocity, population size, learning factor, maximum number of iterations T max , inertia weight ω and position update equation;

[0032] S53, dynamically adjusting the inertia weight ω according to the particle distance, smoothing the search characteristics of the inertia weight ω, balancing the local and global search states, so that the solution tends to be stable and converges quickly, avoiding falling into the local optimum;

[0033] S54, through repeated iterations, optimize the particle space, when the search time interval (T QL ,T QH ) or the maximum number of iterations T max When , stop iteration and output the optimal solution;

[0034] S55, obtaining an optimal solution, determining the optimal starting voltage data of the Class I relay according to the optimal solution, and optimizing the classification accuracy of the relay starting voltage classification subsystem;

[0035] S56. If the optimal solution is not obtained, return to continue searching and optimizing until the conditions are met.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] The invention combines relay starting voltage classification with non-electrical quantity protection to design a system for improving the reliability of non-electrical quantity protection. The invention mainly designs the whole system. The system designs two subsystems. While obtaining a relay with a reasonable starting voltage range, the non-electrical quantity protection starting circuit has higher starting reliability. At the same time, the non-electrical quantity protection subsystem is designed based on the obtained relay to be installed, so that the non-electrical quantity protection subsystem has the characteristics of relay holding coil reset, action delay under rated voltage, and starting need to reach a certain power. After the Class I relay is started, the signal feedback circuit can be used to automatically cut off the non-electrical quantity starting circuit to reduce the overall power consumption of the non-electrical quantity protection subsystem, thereby greatly improving the reliability of the non-electrical quantity protection against interference and false operation, and being beneficial to enhancing the robustness of the traction substation integrated automation system.

[0038] The invention also proposes a method for improving the reliability of non-electrical quantity protection. By classifying relays according to their starting voltages, relays with a reasonable starting voltage range are obtained, so that the non-electrical quantity protection starting circuit has higher starting reliability. At the same time, by designing modules such as reset, delay, power control and signal feedback, the non-electrical quantity protection subsystem has the characteristics of relay holding coil reset, action delay under rated voltage, and starting requiring a certain power. After the Class I relay is started, the signal feedback circuit can be used to automatically cut off the non-electrical quantity starting circuit to reduce the overall power consumption of the non-electrical quantity protection subsystem. Finally, the optimal performance parameters of the non-electrical quantity protection subsystem are searched by using an improved particle swarm optimization algorithm, and a large amount of performance parameter data is counted and reversely input into the relay starting voltage classification subsystem to optimize the classification of relays to be installed, so that the non-electrical quantity protection starting voltage is more accurate and controllable. After repeated iterative calculations and tests, the reliability of the non-electrical quantity protection in anti-interference and anti-false operation can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0040] Figure 1 A schematic diagram of a system for improving the reliability of non-electrical quantity protection according to an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of a relay starting voltage classification subsystem according to an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of a non-electrical quantity protection subsystem according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0047] A system for improving the reliability of non-electrical protection, such as Figures 1 to 3 As shown, it includes the relay starting voltage classification subsystem and the non-electrical quantity protection subsystem:

[0048] The relay starting voltage classification subsystem includes a relay classification device, a power module for supplying power to the relay classification device, and a host computer for controlling the operation of the power module; the relay classification device is provided with a plurality of Tport test ports for installing the relays to be installed, and the host computer is connected to each Tport test port through a DC voltage acquisition module and a switch quantity acquisition module; the power module includes a DC source for supplying power to the relay classification device, and a programmable power switch for controlling the power on and off of each Tport test port, and the host computer is electrically connected to the programmable power switch;

[0049] Specific, combined Figure 2 and Figure 3 , the detailed technical solution is as follows:

[0050] like Figure 2 As shown, the relay starting voltage classification subsystem is used to classify the relays to be installed. The purpose of classification is to find the relays to be installed with suitable starting voltages. It can be seen from the characteristics of the relays that the relays produced by various relay suppliers are quite different. Even for relays with the same voltage level, the starting voltage values ​​are quite different. The relay is a key component in the design of non-electrical protection. The fluctuation range of the starting voltage of the relay is large, which will cause the non-electrical protection to be unstable, malfunction, refuse to operate and other reliability problems. Therefore, it is unreliable to calculate the starting voltage of the relay only through the datasheet of the relay. It needs to be classified through an auxiliary classification system. However, due to the use of manual classification, it is time-consuming, labor-intensive, and costly, and the classification accuracy is low.

[0051] Therefore, the invention first designs a relay starting voltage classification subsystem, which can be used to conveniently, quickly and accurately classify the relays to be installed; the relay starting voltage classification subsystem designed in the invention can realize the rapid and accurate classification of the relays to be installed, greatly improving the classification efficiency and accuracy of the relays to be installed;

[0052] Specifically, the voltage adjustment range of the DC source is 0-300V, which can provide DC voltage for most relay tests;

[0053] The relay classification device comprises 10 conventional Tport test ports and 2 spare Tport test ports. It has the testing capability of multiple packages. By simply selecting different modes, the base package can be switched to realize the classification of multiple relays.

[0054] The programmable power switch is a multi-channel programmable switch with a wide operating frequency, suitable for DC~100MHz, high isolation between channels, each device has 32 I / O channels, can be cascaded, has remote control function, and can be configured through the network;

[0055] The DC voltage acquisition module can simultaneously meet the needs of 16-channel DC voltage acquisition, with a resolution of 16 bits and a sampling rate of 200kSPS. It has a buffer with a 1 megohm analog input impedance and can expand the acquisition channels.

[0056] The state quantity collected by the switch quantity acquisition module is the contact closing / opening condition of the relay to be installed, from which it can be judged whether the relay is started;

[0057] The relay to be installed is a small, polarized, double-coil magnetic latching power relay; specifically, the relay to be installed is a small, polarized, double-coil magnetic latching power relay, which can be a Panasonic DSP2a-L2-24V relay, with a theoretical starting voltage range of 80% or less of the rated value, and a measured starting voltage range of about 9.5V to 17.7V;

[0058] Specifically, the host computer can adopt an existing control host computer. The main innovation of the present invention lies in the structural design and improvement of the relay starting voltage classification subsystem. It mainly provides a hardware framework structure for the system for improving the reliability of non-electrical protection. It does not involve host computer control software. Technical personnel in this field can choose to use existing control software as long as they can achieve control of the programmable power switch.

[0059] The non-electrical quantity protection subsystem includes an outlet module and a signal feedback module arranged in parallel, and a non-electrical quantity input module for controlling the on and off of the two. One end of the outlet module is connected to the positive control mother +KM through the IJ-1 contact switch, and the other end is connected to the negative control mother -KM. One end of the signal feedback module is connected to the positive control mother +KM through the IJ-2 contact switch, and the other end is connected to the negative control mother -KM. The non-electrical quantity input module includes a non-electrical quantity input port, a power control submodule, a Class I relay submodule to be installed, a delay submodule 1 for controlling the delay of the Class I relay submodule to be installed, and a reset submodule for controlling the reset of the Class I relay submodule to be installed. The power control submodule is arranged in parallel with the Class I relay submodule to be installed. The Class I relay submodule to be installed includes a classified Class I relay and a series power resistor submodule 1 for adjusting the current or power of the non-electrical quantity input module. The delay submodule 1 and the reset submodule are connected to the Class I relay, and the opening and closing of the IJ-1 contact switch and the IJ-2 contact switch are both controlled by the Class I relay.

[0060] The export module includes an export relay, a delay submodule 2 for controlling the export relay delay, and a series power resistor submodule 2 for adjusting the export module current or power; the delay submodule 2 is connected to the export relay; specifically, the export relay is a fast export relay, and the action time is less than t4, and the power lower limit values ​​of the series power resistor submodule 1 and the series power resistor submodule 2 are both greater than W0.

[0061] The signal feedback module includes a control relay, a signal relay, and a series power resistor submodule 3 for adjusting the current or power of the signal feedback module; the non-electrical input port is provided with a KJ contact switch for controlling the on and off of the non-electrical input port, and the KJ contact switch is controlled by the control relay.

[0062] Specifically, Figure 3 As shown, in the non-electrical protection subsystem, the outlet relay can adopt Panasonic DK2a-24V relay, the action time is less than 3ms, the power lower limit values ​​of the series power resistor submodule 1 and the series power resistor submodule 2 are both greater than 3W, one end of the series power resistor submodule 1 and 2 are respectively connected to the negative pole of the Class I relay coil and the negative pole of the outlet relay coil, and the other end is connected to -KM, the contact IJ-1 of the Class I relay, one end is connected to the positive pole of the outlet relay coil, and the other end is connected to +KM; the reset submodule is connected to the reset coil of the Class I relay, when the Class I relay is started, it needs to be reset, and the reset submodule can be completed;

[0063] The delay submodule 1 is connected in parallel with the Class I relay, and the delay submodule 2 is connected in parallel with the output relay. Both the delay submodule 1 and the delay submodule 2 are composed of metallized polyester film capacitors (impregnated type). They adopt a non-inductive winding structure, have a wide capacity range, are small in size, light in weight, have good self-healing properties, have a long service life, and are encapsulated with flame-retardant epoxy powder, and are particularly suitable for the requirements of stability and reliability of relay protection devices. The delay time of the delay submodule 1 is set to 15ms, and the delay time of the delay submodule 2 is set to 5ms. Due to the existence of cumulative errors, the delay time fluctuates greatly, and other performance parameters of non-electrical protection need to be coordinated and matched to find the optimal value. Its principle is to charge it in the positive half cycle of the industrial frequency alternating current and discharge it in the negative half axis. When the charging voltage reaches the starting voltage of the relay, the relay acts to achieve the delay effect.

[0064] The signal feedback module includes a control relay, a signal relay and a series power resistor submodule 3, which are connected in series. One end of the series power resistor submodule 3 is connected to -KM, and the other end is connected to the negative pole of the signal relay coil; one end of the contact KJ of the control relay is connected to the positive pole of the Class I relay coil, and the other end is connected to "input", that is, non-electrical signal input; one end of the contact IJ-2 of the Class I relay is connected to the positive pole of the control relay coil, and the other end is connected to +KM; the power control submodule is connected to the positive pole of the Class I relay coil, and the other end is connected to -KM, and the reset submodule of the power control submodule is connected to the Class I relay; when the non-electrical protection starting circuit is activated, the power value of the power control submodule should be greater than or equal to 5W;

[0065] After classification by the relay starting voltage classification subsystem, a highly reliable Class I relay is obtained. At the same time, an export module, a signal feedback module, and a non-electrical quantity input module for controlling the on and off of the two are added, which greatly improves the anti-interference performance and reliability of the non-electrical quantity protection subsystem. It can meet the requirements of non-electrical quantity protection starting power greater than 5W for tripping, starting voltage within the range of 55% to 70% of the rated DC power supply voltage, action time of 10ms to 35ms under the rated DC power supply voltage, and ability to resist 220V industrial frequency voltage interference, meeting the requirements of "definite action and definite non-action" for non-electrical quantity protection.

[0066] A method for applying the above-mentioned system for improving the reliability of non-electrical quantity protection comprises:

[0067] S1. First, the relays to be installed are classified using the relay starting voltage classification subsystem; the relays to be installed are classified into Class I and Class II according to the starting voltage V level of the relays to be installed;

[0068] S2. Design the non-electrical quantity protection subsystem using the Class I relay obtained by classification;

[0069] S3. Design an export module, a non-electrical quantity input module and a signal feedback module in the non-electrical quantity protection subsystem;

[0070] S4. Design and implement the control logic of the non-electrical protection subsystem for non-electrical protection;

[0071] S5, using the improved particle swarm optimization algorithm to search for the optimal performance parameters of the non-electrical protection subsystem in S2;

[0072] S6. When the performance parameters of the non-electrical protection subsystem are optimal and stable, a large amount of performance parameter data is statistically input into the relay starting voltage classification subsystem of step S1 to optimize the classification of relays to be installed; through repeated iterative operations, the optimal classification of relays to be installed is achieved to improve the performance of the relay starting voltage classification subsystem and the non-electrical protection subsystem.

[0073] The specific classification method of the relay starting voltage classification subsystem for the relays to be installed in step S1 is as follows:

[0074] S11. Install n relays to be installed on the relay classification device;

[0075] S12. Use the relay intelligent classification software on the host computer to control the programmable power switch, so that the DC power supply adjusts the output voltage value step by step with v0, and the step period is set to t1;

[0076] S13. Determine the classification threshold V according to the voltage level of the non-electric quantity protection f , Class I relays are those with a starting voltage V greater than V f , and the rest are Class II;

[0077] S14. Start classification. The DC voltage acquisition module collects the voltage values of n Tports in real time, sets it to the synchronous sampling mode of n Tports, and the sampling period is t2; the digital input module dynamically monitors the contact position change of the relay, sets it to the polling mode, and the polling period is t3, which should satisfy t2 < t3 < t1. When the contact changes, the host computer immediately records the voltage value V uploaded by the current DC voltage acquisition module and locks the current Tport until all n Tports are classified.

[0078] In Embodiment 1, the classification steps of the specific relay starting voltage classification subsystem for the relays to be installed are as follows:

[0079] Step 1. First, install 10 Panasonic DSP2a-L2-24V on the relay classification device, and then power on the relay starting voltage classification subsystem to enter the waiting classification state;

[0080] Step 2. According to the voltage level of the non-electric quantity protection, that is, the on-site voltage system is 24V / 60V / 110V / 220V, etc., determine the classification threshold V f , taking 110V as an example here, the classification threshold V f can be set to 15.5V through a large number of experiments. Class I relays are those with a starting voltage V greater than 15.5V, and the rest are Class II;

[0081] Step 3. Open the control and analysis software on the host computer, select "Relay Classification", then select "Panasonic DSP2a-L2-24V", and set the parameters: (1) The step value of the DC source is 0.1V; (7) The initial value of the DC source is set to 15.0V; (2) The DC source step cycle is 20ms; (3) The voltage standard is 110V; (4) Tport synchronous sampling mode; (5) Tport synchronous sampling cycle is 500us; (6) The switch quantity acquisition is set to polling mode; (7) The polling cycle is set to 10ms; Click "Start Classification" to start the classification program;

[0082] Step 4: After the software is started, the program-controlled power switch is turned on, and the DC source is adjusted to the output voltage value with a step of 0.1V and a period of 10ms;

[0083] Step 5. The DC voltage acquisition module collects the voltage values ​​of 10 Tports in real time, and the switch quantity acquisition module dynamically monitors the position change of the relay contacts. When the contacts change position, the host computer immediately records the voltage value U uploaded by the current DC voltage acquisition module and locks the current Tport until all 10 Tports are classified.

[0084] In step S3, when the non-electrical quantity input module is activated, the power value of the power control submodule should be greater than or equal to W1. In step S4, the specific control logic of the non-electrical quantity protection subsystem is:

[0085] When there is a non-electrical quantity signal input, the input power is greater than W1, and the input can be maintained until the delay submodule 1 delay t5 ends, then the Class I relay is actuated, the IJ-1 contact switch and the IJ-2 contact switch are closed, and the control relay and the signal relay are started; after the control relay is started, the control KJ contact switch is opened, so that the non-electrical quantity input module is powered off, and the power control submodule also stops working, reducing the power consumption of the non-electrical quantity protection subsystem. After the non-electrical quantity input module is powered off, all contacts remain in the current state; after the IJ-1 contact switch is closed, after the delay submodule 2 delay t6, the output relay is started, and at this time, the output can be exported through the output relay contacts;

[0086] When there is external interference input, the input energy of the interference is less than W1, or it fails to last until the delay t5 of the delay submodule 1 ends, then the Class I relay will not start;

[0087] Specifically, when there is a non-electrical quantity signal input, the input power is greater than 5W, and the input can be maintained until the delay of the delay submodule 1 ends after 15ms, the Class I relay is actuated, the two contact switches IJ-1 and IJ-2 are closed, the control relay and the signal relay are started, and after a delay of 5ms by the delay submodule 2, the output relay is also started, and the control relay contact KJ is opened, so that the Class I relay is powered off and the current contact state is maintained. At the same time, the power control submodule stops working, which greatly reduces the overall power consumption of the non-electrical quantity protection subsystem;

[0088] When there is external interference input, the input energy of the interference is less than 5W, or it fails to last until the 15ms delay of delay submodule 1 ends, the Class I relay will not start.

[0089] In step S5, the specific method of improving the particle swarm optimization algorithm to search for the optimal performance parameters of the non-electrical protection subsystem in step S2 is as follows:

[0090] S51, obtaining the total time t7 from the start of the Class I relay to the start of the outlet relay, t7 is equal to the sum of the Class I relay action times t0, t4, t5 and t6, and setting t7 as a feature vector;

[0091] S52, set the search time interval (T QL ,T QH ), initialize particle position, velocity, population size, learning factor, maximum number of iterations T max , inertia weight ω and position update equation;

[0092] S53, dynamically adjusting the inertia weight ω according to the particle distance, smoothing the search characteristics of the inertia weight ω, balancing the local and global search states, so that the solution tends to be stable and converges quickly, avoiding falling into the local optimum;

[0093] S54, through repeated iterations, optimize the particle space, when the search time interval (T QL ,T QH ) or the maximum number of iterations T max When , stop iteration and output the optimal solution;

[0094] S55, obtaining an optimal solution, determining the optimal starting voltage data of the Class I relay according to the optimal solution, and optimizing the classification accuracy of the relay starting voltage classification subsystem;

[0095] S56, if the optimal solution is not obtained, return to continue searching and optimizing until the conditions are met;

[0096] Specifically, the improved particle swarm optimization algorithm searches for the optimal performance parameters of the non-electrical protection subsystem as follows: Step 1: After the non-electrical protection subsystem is designed, the total time t7 from the start of the Class I relay to the closing of the output relay contact is obtained through an oscilloscope or a relay protection instrument. T7 is equal to the sum of the Class I relay action time t0, t4, t5 and t6, and t7 is set as the feature vector; the optimal search time interval (25ms, 30ms,) is set, and the particle position, speed, population size, learning factor, and maximum number of iterations T are initialized. max , inertia weight ω and position update equation; Step 2, dynamically adjust the inertia weight ω according to the particle distance, smooth the search characteristics of the inertia weight ω, balance the local and global search states, make it converge quickly, and avoid falling into the local optimum; optimize the particle space through repeated iterations, when the search time interval or the maximum number of iterations T is met max When , stop iteration and output the optimal solution; Step 3, otherwise return to continue searching and optimizing until the conditions are met.

[0097] The invention combines relay starting voltage classification with non-electrical quantity protection to design a system for improving the reliability of non-electrical quantity protection. The invention mainly designs the whole system. The system designs two subsystems. While obtaining a relay with a reasonable starting voltage range, the non-electrical quantity protection starting circuit has higher starting reliability. At the same time, the non-electrical quantity protection subsystem is designed based on the obtained relay to be installed, so that the non-electrical quantity protection subsystem has the characteristics of relay holding coil reset, action delay under rated voltage, and starting need to reach a certain power. After the Class I relay is started, the signal feedback circuit can be used to automatically cut off the non-electrical quantity starting circuit to reduce the overall power consumption of the non-electrical quantity protection subsystem, thereby greatly improving the reliability of the non-electrical quantity protection against interference and false operation, and being beneficial to enhancing the robustness of the traction substation integrated automation system.

[0098] The invention also proposes a method for improving the reliability of non-electrical quantity protection. By classifying relays according to their starting voltages, relays with a reasonable starting voltage range are obtained, so that the non-electrical quantity protection starting circuit has higher starting reliability. At the same time, by designing modules such as reset, delay, power control and signal feedback, the non-electrical quantity protection subsystem has the characteristics of relay holding coil reset, action delay under rated voltage, and starting requiring a certain power. After the Class I relay is started, the signal feedback circuit can be used to automatically cut off the non-electrical quantity starting circuit to reduce the overall power consumption of the non-electrical quantity protection subsystem. Finally, the optimal performance parameters of the non-electrical quantity protection subsystem are searched by using an improved particle swarm optimization algorithm, and a large amount of performance parameter data is counted and reversely input into the relay starting voltage classification subsystem to optimize the classification of relays to be installed, so that the non-electrical quantity protection starting voltage is more accurate and controllable. After repeated iterative calculations and tests, the reliability of the non-electrical quantity protection in anti-interference and anti-false operation can be improved.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for improving the reliability of non-electrical quantity protection, characterized in that: Including relay starting voltage classification subsystem and non-electrical quantity protection subsystem: The relay starting voltage classification subsystem includes a relay classification device, a power module for supplying power to the relay classification device, and a host computer for controlling the operation of the power module; the relay classification device is provided with a plurality of Tport test ports for installing the relays to be installed, and the host computer is connected to each Tport test port through a DC voltage acquisition module and a switch quantity acquisition module; the power module includes a DC source for supplying power to the relay classification device, and a programmable power switch for controlling the power on and off of each Tport test port, and the host computer is electrically connected to the programmable power switch; The non-electrical quantity protection subsystem includes an outlet module and a signal feedback module arranged in parallel, and a non-electrical quantity input module for controlling the on and off of the two. One end of the outlet module is connected to the positive control mother +KM through the IJ-1 contact switch, and the other end is connected to the negative control mother -KM. One end of the signal feedback module is connected to the positive control mother +KM through the IJ-2 contact switch, and the other end is connected to the negative control mother -KM. The non-electrical quantity input module includes a non-electrical quantity input port, a power control submodule, a Class I relay submodule to be installed, a delay submodule 1 for controlling the delay of the Class I relay submodule to be installed, and a reset submodule for controlling the reset of the Class I relay submodule to be installed. The power control submodule is arranged in parallel with the Class I relay submodule to be installed. The Class I relay submodule to be installed includes a classified Class I relay and a series power resistor submodule 1 for adjusting the current or power of the non-electrical quantity input module. The delay submodule 1 and the reset submodule are connected to the Class I relay, and the opening and closing of the IJ-1 contact switch and the IJ-2 contact switch are controlled by the Class I relay. The outlet module includes an outlet relay, a delay submodule 2 for controlling the delay of the outlet relay, and a series power resistor submodule 2 for adjusting the current or power of the outlet module; the delay submodule 2 is connected to the outlet relay; The signal feedback module includes a control relay, a signal relay, and a series power resistor submodule 3 for adjusting the current or power of the signal feedback module; the non-electrical input port is provided with a KJ contact switch for controlling the on and off of the non-electrical input port, and the KJ contact switch is controlled by the control relay.

2. A method for improving the reliability of non-electrical quantity protection, applied to the system for improving the reliability of non-electrical quantity protection as claimed in claim 1, characterized in that: include: S1. First, the relays to be installed are classified using the relay starting voltage classification subsystem; the relays to be installed are classified into Class I and Class II according to the starting voltage V level of the relays to be installed; S2. Design the non-electrical quantity protection subsystem using the Class I relay obtained by classification; S3. Design an export module, a non-electrical quantity input module and a signal feedback module in the non-electrical quantity protection subsystem; S4. Design and implement the control logic of the non-electrical protection subsystem for non-electrical protection; S5, using the improved particle swarm optimization algorithm to search for the optimal performance parameters of the non-electrical protection subsystem in S2; S6. When the performance parameters of the non - electrical protection subsystem are optimal and stable, a large amount of performance parameter data is statistically input into the relay starting voltage classification subsystem in step S1 to optimize the classification of the relays to be installed. Through repeated iterative calculations, the optimal classification of the relays to be installed is achieved to improve the performance of the relay starting voltage classification subsystem and the non - electrical protection subsystem.

3. A method for improving the reliability of non-electrical quantity protection according to claim 2, characterized in that: In step S1, the relay to be installed is a small - sized, polarized, double - coil magnetic - latching power relay.

4. A method for improving the reliability of non-electrical quantity protection according to claim 2, characterized in that: The specific classification method of the relay starting voltage classification subsystem for the relay to be installed in step S1 is as follows: S11. Install n relays to be installed on the relay classification device. S12. Use the relay intelligent classification software on the host computer to control the program - controlled power switch, so that the DC power source adjusts the output voltage value step - by - step with v0, and the step - by - step period is set as t1. S13. Determine the classification threshold Vf according to the voltage level of the non - electrical protection. For class - I relays, the starting voltage V is greater than Vf, and the rest are class - II. S14. Start classification. The DC voltage acquisition module real - time acquires the voltage values of n Tports, and is set to the synchronous sampling mode of n Tports, and the sampling period is t2. The digital - input acquisition module dynamically monitors the contact position change of the relay, and is set to the polling mode, and the polling period is t3, and it should satisfy t2 < t3 < t1. When the contact changes position, the host computer immediately records the voltage value V uploaded by the current DC voltage acquisition module and locks the current Tport until all n Tports are classified.

5. A method for improving the reliability of non-electrical quantity protection according to claim 2, characterized in that: In step S3, when the non - electrical input module operates, the power value of the power control sub - module should be greater than or equal to W1.

6. A method for improving the reliability of non-electrical quantity protection according to claim 5, characterized in that: In step S4, the specific control logic of the non - electrical protection subsystem is as follows: When a non - electrical signal is input, if the input power is greater than W1 and the input can be maintained until the end of the delay of delay sub - module 1 for t5, then the class - I relay operates, and the IJ - 1 contact switch and the IJ - 2 contact switch close, controlling the control relay and the signal relay to start. After the control relay starts, control the KJ contact switch to open, so that the non - electrical input module loses power, and at the same time the power control sub - module also stops working, reducing the power consumption of the non - electrical protection subsystem. After the non - electrical input module loses power, all contacts maintain the current state. After the IJ - 1 contact switch closes, after the delay of delay sub - module 2 for t6, the outlet relay starts, and at this time, it can be exported externally through the outlet relay contacts. When there is external interference input, if the input energy of the interference is less than W1, or it fails to be maintained until the end of the delay of delay sub - module 1 for t5, then the class - I relay does not start.

7. A method for improving the reliability of non-electrical quantity protection according to claim 2, characterized in that: The specific method of using the improved particle swarm optimization algorithm to search for the optimal performance parameters of the non - electrical protection subsystem in step S2 is as follows: S51. Obtain the total time t7 from the start of the class - I relay operation to the start of the outlet relay. t7 is equal to the sum of the action time t0, t4, t5, and t6 of the class - I relay, and set t7 as the feature vector. S52, set the search time interval (TQL, TQH), initialize the particle position, velocity, population size, learning factor, maximum number of iterations Tmax, inertia weight ω and position update equation; S53, dynamically adjusting the inertia weight ω according to the particle distance, smoothing the search characteristics of the inertia weight ω, balancing the local and global search states, so that the solution tends to be stable and converges quickly, avoiding falling into the local optimum; S54, optimizing the particle space through repeated iterations, when the search time interval (TQL, TQH) or the maximum number of iterations Tmax is met, stopping the iteration and outputting the optimal solution; S55, obtaining an optimal solution, determining the optimal starting voltage data of the Class I relay according to the optimal solution, and optimizing the classification accuracy of the relay starting voltage classification subsystem; S56. If the optimal solution is not obtained, return to continue searching and optimizing until the conditions are met.

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