Current setting method and device for anti-jump locking relay

Abstract

The application discloses a current setting method and device of an anti-jump locking relay, and the method comprises the following steps: calculating the breaking current of a circuit breaker according to the rated voltage of a substation DC system, the first coil resistance of a TBJ in a relay protection device, the parallel equivalent resistance of the TBJ coil and the second coil resistance of the circuit breaker; determining the setting current which is greater than the breaking current by a preset differential; performing the refuse-to-operate processing on the TBJ by calculating the operating current of the setting current and the operating time of the operating current; and determining the final setting current of the TBJ. It can be seen that the operating characteristics of the TBJ are analyzed by calculating the operating current and the operating time, so that the ability of avoiding the current impact when the TBJ input loop is grounded is analyzed, the refuse-to-operate processing is performed on the TBJ, and the final setting current obtained can guarantee that the relay protection device will not malfunction, so that the operation accuracy of the relay protection device is improved, and the safety of the power grid is ensured.

Description

Technical Field

[0001] This application relates to the field of relay protection technology, and more specifically, to a current setting method and device for an anti-pumping lockout relay. Background Technology

[0002] With the rapid development of power technology and the continuous expansion of power systems, especially with the application of new technologies, substation structures are becoming increasingly complex. Substation DC systems contain relay protection devices, which are the last line of defense for the safe and stable operation of the power grid. Problems with their correct operation can become a significant threat to the safe operation of the power grid. The anti-pumping interlocking relay (TBJ) in the relay protection device is a key component in its operation.

[0003] Nowadays, TBJs are often only considered based on the rated parameters of the circuit breaker's tripping current, while ignoring the actual structure of the substation. If a single-point grounding event occurs in the TBJ input circuit, the TBJ's operating characteristics may not be able to avoid the current surge when the TBJ input circuit is grounded, leading to maloperation of the relay protection device.

[0004] How to set the current of TBJ to improve the accuracy of relay protection device operation and ensure power grid safety is an issue that needs attention. Summary of the Invention

[0005] In view of the above problems, this application is made to provide a current setting method and device for an anti-pumping lockout relay, so as to improve the operating accuracy of relay protection devices and ensure power grid safety.

[0006] To achieve the above objectives, the following specific solutions are proposed:

[0007] A current setting method for an anti-pumping lockout relay includes:

[0008] Obtain the rated voltage of the substation DC system, the first coil resistance of the anti-pumping interlocking relay TBJ of the relay protection device in the substation DC system, the cable resistance of the substation DC system, the equivalent resistance connected in parallel with the coil of the TBJ, and the second coil resistance of the circuit breaker in the substation DC system.

[0009] Calculate the tripping current of the circuit breaker based on the rated voltage, the resistance of the first coil, the cable resistance, the equivalent resistance, and the resistance of the second coil.

[0010] A setting current not less than the tripping current is determined, wherein the setting current is not greater than the upper limit of a preset step difference of the tripping current;

[0011] By calculating the operating current of the set current and the operating time of the operating current, the TBJ is subjected to a failure to operate, and the final set current of the TBJ is determined.

[0012] Optionally, the step of calculating the operating current of the setting current and the operating time of the operating current to perform anti-operation processing on the TBJ and determine the final setting current of the TBJ includes:

[0013] Based on the set current, calculate the latest operating current of the TBJ and determine the operating time of the operating current;

[0014] When the peak current of the TBJ under zero-state response when one point of its input circuit is grounded is greater than the operating current, the duration of the current higher than the operating current in the actual current flowing through the TBJ under zero-state response when one point of its input circuit is grounded is determined.

[0015] If the duration is less than the action time, the TBJ is refused to operate, and it is determined whether the action current is greater than the preset ratio of the tripping current.

[0016] If the operating current is greater than the preset ratio of the tripping current, the current setting current is determined to be the final setting current of the TBJ.

[0017] Optionally, the method further includes:

[0018] When the peak current of the TBJ in zero-state response when it is grounded at one point in its input circuit is not greater than the operating current, the steps of performing the TBJ refusal to operate and determining whether the operating current is greater than the preset ratio of the tripping current are executed.

[0019] Optionally, the method further includes:

[0020] If the duration is not less than the action time, the setting current is increased by one preset level to obtain an updated setting current;

[0021] Add 1 to the first calculation parameter to obtain the updated first calculation parameter, the value of the first calculation parameter at initialization is 0;

[0022] Determine whether both the first calculation parameter and the second calculation parameter are greater than 0. The value of the second calculation parameter at initialization is 0.

[0023] If not, then perform the steps of calculating the latest operating current of the TBJ based on the set current and determining the operating time of the operating current.

[0024] Optionally, the method further includes:

[0025] If the operating current is not greater than the preset ratio of the tripping current, the setting current is reduced by one preset level difference to obtain an updated setting current.

[0026] Add 1 to the second calculation parameter to obtain the updated second calculation parameter, and then perform the step of determining whether both the first calculation parameter and the second calculation parameter are greater than 0.

[0027] Optionally, the method further includes:

[0028] When both the first calculated parameter and the second calculated parameter are greater than 0, if the first calculated parameter is updated earlier than the second calculated parameter during the update process, the current setting current is determined to be the final setting current of the TBJ.

[0029] Optionally, the method further includes:

[0030] When both the first calculated parameter and the second calculated parameter are greater than 0, if the second calculated parameter is updated earlier than the first calculated parameter during the update process, the setting current before the first calculated parameter is updated is determined to be the final setting current of the TBJ.

[0031] Optionally, when both the first calculated parameter and the second calculated parameter are greater than 0, if during the update process, the first calculated parameter is updated earlier than the second calculated parameter, and after determining that the current setting current is the final setting current of the TBJ, the method further includes:

[0032] Issue an alarm.

[0033] Optionally, when both the first calculated parameter and the second calculated parameter are greater than 0, if during the update process, the second calculated parameter is updated earlier than the first calculated parameter, and after determining the setting current before the first calculated parameter update as the final setting current of the TBJ, the method further includes:

[0034] Issue an alarm.

[0035] A current setting device for an anti-pumping lockout relay includes:

[0036] The parameter acquisition unit is used to acquire the rated voltage of the substation DC system, the first coil resistance of the anti-pumping interlocking relay TBJ of the relay protection device in the substation DC system, the cable resistance of the substation DC system, the equivalent resistance connected in parallel with the coil of the TBJ, and the second coil resistance of the circuit breaker in the substation DC system.

[0037] The tripping current calculation unit is used to calculate the tripping current of the circuit breaker based on the rated voltage, the resistance of the first coil, the cable resistance, the equivalent resistance, and the resistance of the second coil.

[0038] A setting current determining unit is used to determine a setting current that is not less than the tripping current, wherein the setting current is not greater than the upper limit of a preset step difference of the tripping current;

[0039] The final setting current determination unit is used to determine the final setting current of the TBJ by calculating the operating current of the setting current and the operating time of the operating current, performing a failure-to-operate process on the TBJ.

[0040] Optionally, the final setting current determination unit includes:

[0041] An action information determination unit is used to calculate the latest operating current of the TBJ based on the set current, and to determine the operating time of the operating current.

[0042] The duration determination unit is used to determine the duration of the current that is higher than the operating current in the actual current flowing through the TBJ when the peak current of the TBJ in the zero-state response when the input circuit point of the TBJ is grounded is greater than the operating current.

[0043] The refusal-to-operate processing unit is used to perform refusal-to-operate processing on the TBJ if the duration is less than the operating time, and to determine whether the operating current is greater than a preset ratio of the tripping current.

[0044] The first setting current determination unit is used to determine the current setting current as the final setting current of the TBJ if the operating current is greater than a preset ratio of the tripping current.

[0045] Optionally, the current setting device further includes:

[0046] The jump execution unit is used to perform the steps of refusing to operate the TBJ and determining whether the operating current is greater than the preset ratio of the tripping current when the peak current of the TBJ in the zero state response when the TBJ is grounded at one point in its input circuit is not greater than the operating current.

[0047] Optionally, the current setting device further includes:

[0048] The setting current upgrade unit is used to increase the setting current by a preset level if the duration is not less than the action time, so as to obtain an updated setting current.

[0049] The first calculation parameter update unit is used to add 1 to the first calculation parameter to obtain the updated first calculation parameter, the value of the first calculation parameter at initialization is 0;

[0050] The parameter value judgment unit is used to determine whether the first calculation parameter and the second calculation parameter are both greater than 0. The value of the second calculation parameter is 0 at the time of initialization. If not, the action current calculation unit is executed.

[0051] The operating current calculation unit is used to perform the steps of calculating the latest operating current of the TBJ based on the setting current, and determining the operating time of the operating current.

[0052] Optionally, the current setting device further includes:

[0053] The setting current degradation unit is used to reduce the setting current by a preset level difference if the operating current is not greater than a preset ratio of the tripping current, so as to obtain an updated setting current.

[0054] The second calculation parameter update unit is used to add 1 to the second calculation parameter to obtain the updated second calculation parameter, and to perform the step of determining whether the first calculation parameter and the second calculation parameter are both greater than 0.

[0055] Optionally, the current setting device further includes:

[0056] The second setting current determination unit is used to determine the current setting current as the final setting current of the TBJ when both the first calculated parameter and the second calculated parameter are greater than 0, and if the first calculated parameter is updated earlier than the second calculated parameter during the updating process.

[0057] Optionally, the current setting device further includes:

[0058] The third setting current determination unit is used to determine the setting current before the first calculation parameter is updated as the final setting current of the TBJ when both the first calculation parameter and the second calculation parameter are greater than 0, and if the second calculation parameter is updated earlier than the first calculation parameter during the updating process.

[0059] Optionally, the current setting device further includes:

[0060] The first alarm notification unit is used to issue an alarm notification when both the first calculated parameter and the second calculated parameter are greater than 0, and if the first calculated parameter is updated earlier than the second calculated parameter during the update process, and the current setting current is determined to be the final setting current of the TBJ.

[0061] Optionally, the current setting device further includes:

[0062] The second alarm notification unit is used to issue an alarm notification when both the first calculated parameter and the second calculated parameter are greater than 0, and if the second calculated parameter is updated earlier than the first calculated parameter during the update process, and the setting current before the first calculated parameter is updated is determined to be the final setting current of the TBJ.

[0063] By employing the above technical solution, this application obtains the rated voltage of the substation DC system, the first coil resistance of the anti-pumping interlocking relay TBJ in the substation DC system, the cable resistance of the substation DC system, the equivalent resistance connected in parallel with the coil of the TBJ, and the second coil resistance of the circuit breaker in the substation DC system. Based on the rated voltage, the first coil resistance, the cable resistance, the equivalent resistance, and the second coil resistance, the opening current of the circuit breaker is calculated, and a setting current not less than the opening current is determined. The setting current is not greater than the upper limit of a preset step difference of the opening current. By calculating the operating current and the operating time of the setting current, the TBJ is subjected to a refusal-to-operate process, and the final setting current of the TBJ is determined. Therefore, by calculating the operating current and the operating time, the ability of the TBJ to avoid the current surge when the TBJ input circuit is grounded at a single point is analyzed, and the TBJ is subjected to a refusal-to-operate process. The final setting current obtained ensures that the relay protection device will not malfunction, thereby improving the operating accuracy of the relay protection device and ensuring power grid safety. Attached Figure Description

[0064] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0065] Figure 1 A schematic diagram illustrating the current setting of an anti-pumping lockout relay provided in an embodiment of this application;

[0066] Figure 2A schematic diagram of a first process for setting the current by operating current and operating time, provided in an embodiment of this application;

[0067] Figure 3 A schematic diagram of a second process for setting the current by operating current and operating time, provided in an embodiment of this application;

[0068] Figure 4 A schematic diagram of a third process for setting the current by operating current and operating time, provided in an embodiment of this application;

[0069] Figure 5 A TBJ current-time curve when the TBJ input loop is grounded, as provided in the first example of this application embodiment;

[0070] Figure 6 A TBJ current-time curve when the TBJ input loop is grounded, as provided in the second example of this application embodiment;

[0071] Figure 7 This is a schematic diagram of a device for setting the current of an anti-pumping lockout relay, provided in an embodiment of this application. Detailed Implementation

[0072] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0073] The proposed solution can be implemented based on a terminal with data processing capabilities, such as a computer, server, or cloud platform.

[0074] Next, combined Figure 1 The current setting method for the anti-pumping lockout relay of this application may include the following steps:

[0075] Step S110: Obtain the rated voltage of the substation DC system, the first coil resistance of the anti-pumping interlocking relay TBJ of the relay protection device in the substation DC system, the cable resistance of the substation DC system, the equivalent resistance connected in parallel with the coil of TBJ, and the second coil resistance of the circuit breaker in the substation DC system.

[0076] Specifically, the rated voltage of the substation DC system, the first coil resistance of the anti-pumping interlocking relay TBJ in the substation DC system, the equivalent resistance in parallel with the coil of TBJ, and the second coil resistance of the circuit breaker in the substation DC system can be obtained by consulting the manufacturer or by measurement.

[0077] In addition, the coil inductance of the circuit breaker, the balance bridge resistance of the substation DC system, the cable resistance, the positive capacitor of the substation DC system, and the negative capacitor of the substation DC system can also be obtained.

[0078] Step S120: Calculate the circuit breaker's tripping current based on the rated voltage, the resistance of the first coil, the cable resistance, the equivalent resistance, and the resistance of the second coil.

[0079] Specifically, the tripping current can be calculated using the following formula:

[0080]

[0081] Where U is the rated voltage, R0 is the resistance of the first coil, R1 is the equivalent resistance, R2 is the resistance of the second coil, and R3 is the cable resistance.

[0082] Step S130: Determine a setting current that is not less than the tripping current.

[0083] Specifically, the setting current should not exceed the upper limit of the tripping current by a preset step difference.

[0084] The preset grade difference can be customized, such as 0.5A.

[0085] For example, assuming the preset level difference is 0.5A, when the tripping current is 0.9A, the current level is 0.5A-1A, and the setting current is 1A. When the tripping current is 0.3A, the current level is 0A-0.5A, and the setting current is 0.5A. When the tripping current is 0.5A, the current level is 0A-0.5A, and the setting current is 0.5A.

[0086] Step S140: By calculating the operating current of the setting current and the operating time of the operating current, the TBJ is subjected to a failure to operate, and the final setting current of the TBJ is determined.

[0087] Understandably, by calculating the operating current and operating time, the ability of the TBJ to avoid the current surge when the TBJ input circuit is grounded at one point can be analyzed, and the TBJ can be made to refuse to operate, thus determining the final setting current of the TBJ.

[0088] The current setting method for the anti-pumping lockout relay provided in this embodiment obtains the rated voltage of the substation DC system, the first coil resistance of the anti-pumping lockout relay TBJ in the substation DC system, the cable resistance of the substation DC system, the equivalent resistance connected in parallel with the coil of the TBJ, and the second coil resistance of the circuit breaker in the substation DC system. Based on the rated voltage, the first coil resistance, the cable resistance, the equivalent resistance, and the second coil resistance, the tripping current of the circuit breaker is calculated, and a setting current not less than the tripping current is determined. The setting current is not greater than the upper limit of a preset step difference of the tripping current. By calculating the operating current and the operating time of the setting current, the TBJ is subjected to a refusal-to-operate process, and the final setting current of the TBJ is determined. Therefore, by calculating the operating current and the operating time, the ability of the TBJ to avoid the current surge when the TBJ input circuit is grounded at a single point is analyzed, and the TBJ is subjected to a refusal-to-operate process. The final setting current obtained ensures that the relay protection device will not malfunction, thereby improving the operating accuracy of the relay protection device and ensuring power grid safety.

[0089] In some embodiments of this application, the process of determining the final setting current of TBJ by calculating the operating current and the operating time of the setting current in step S140 above, performing a failure-to-operate processing on TBJ, is described. Figure 2 As shown, the process may include:

[0090] Step S210: Calculate the latest operating current of TBJ based on the setting current, and determine the operating time of the operating current.

[0091] Specifically, the operating current can be obtained by multiplying the setting current by the operating current coefficient. The operating time of the TBJ under the current can then be determined by measurement.

[0092] Step S220: Determine whether the peak current of TBJ in zero-state response when one point of its input circuit is grounded is greater than the operating current. If yes, proceed to step S230; otherwise, proceed to step S250.

[0093] Understandably, when the peak current of the TBJ under zero-state response when one point of its input circuit is grounded is greater than the operating current, it is possible to further determine whether to refuse to operate the TBJ based on the operating time and duration. However, when the peak current of the TBJ under zero-state response when one point of its input circuit is grounded is not greater than the operating current, it is necessary to refuse to operate the TBJ immediately.

[0094] Step S230: Determine the duration of the current higher than the operating current in the actual current flowing through TBJ under the zero-state response when one point of the input circuit of TBJ is grounded.

[0095] It is understandable that when the input circuit of TBJ is grounded at one point, under zero-state response, part of the actual current flowing through TBJ is higher than the operating current. Therefore, the duration can represent the duration of this part of the actual current.

[0096] Step S240: Determine whether the duration is less than the action time. If so, proceed to step S250.

[0097] Step S250: Perform a refusal to operate on TBJ and determine whether the operating current is greater than the preset ratio of the tripping current. If so, proceed to step S260.

[0098] The preset ratio of the tripping current can be customized, such as half of the tripping current.

[0099] It is understandable that when the duration is less than the operating time, or when the peak current of the TBJ in the zero-state response when one point of its input circuit is grounded is not greater than the operating current, there is a need for the TBJ to fail to operate, and the TBJ can be processed to fail to operate.

[0100] Step S260: Determine the current setting current as the final setting current of TBJ.

[0101] It is understandable that when the operating current is greater than the preset ratio of the tripping current, the current setting current can be determined as the final setting current of the TBJ. This final setting current can make the operating characteristics of the TBJ avoid the current surge when the input circuit of the TBJ is grounded at one point, thus preventing the relay protection device from malfunctioning.

[0102] In some embodiments of this application, the setting current can be controlled or adjusted by setting calculation parameters. Specifically, the process of determining the final setting current of TBJ by calculating the operating current and the operating time of the setting current in step S140 above, performing anti-operation processing on TBJ, is as follows: Figure 3 As shown, it may include:

[0103] Step S301: Calculate the latest operating current of TBJ based on the setting current, and determine the operating time of the operating current.

[0104] Step S302: Determine whether the peak current of TBJ in zero-state response when one point of its input circuit is grounded is greater than the operating current. If yes, proceed to step S303; otherwise, proceed to step S305.

[0105] Step S303: Determine the duration of the current higher than the operating current in the actual current flowing through TBJ under the zero-state response when one point of the input circuit of TBJ is grounded.

[0106] Step S304: Determine whether the duration is less than the action time. If yes, proceed to step S305; otherwise, proceed to step S307.

[0107] Step S305: Perform a refusal to operate on TBJ and determine whether the operating current is greater than the preset ratio of the tripping current. If yes, proceed to step S306; otherwise, proceed to step S310.

[0108] Step S306: Determine the current setting current as the final setting current of TBJ.

[0109] The steps S301-S306 described above correspond one-to-one with steps S210-S260 in the aforementioned embodiments. Please refer to the foregoing description for details, which will not be repeated here.

[0110] Step S307: Increase the setting current by a preset level to obtain the updated setting current.

[0111] For example, assuming the preset step difference is 0.5A, when the set current is 0.5A, the updated set current is 1A, and when the set current is 1A, the updated set current is 1.5A.

[0112] Step S308: Add 1 to the first calculation parameter to obtain the updated first calculation parameter.

[0113] The first calculation parameter has a value of 0 during initialization.

[0114] Understandably, the first calculation parameter can be incremented by 1 each time the setting current is adjusted upwards.

[0115] Step S309: Determine whether both the first calculation parameter and the second calculation parameter are greater than 0. If not, proceed to step S301.

[0116] The second calculation parameter is initialized to 0.

[0117] It is understandable that if both the first and second calculated parameters are greater than 0, it indicates that both the first and second calculated parameters have been adjusted, meaning that the setting current has been adjusted both upwards and downwards. If neither the first nor the second calculated parameter is greater than 0, it indicates that at least one of the calculated parameters has not been adjusted, and the setting current is adjusted in one direction only. In this case, the process can return to step S301 to continue adjusting the setting current.

[0118] Step S310: Reduce the setting current by a preset level to obtain the updated setting current.

[0119] For example, assuming the preset step difference is 0.5A, when the set current is 1.5A, the updated set current is 1A, and when the set current is 1A, the updated set current is 0.5A.

[0120] Step S311: Add 1 to the second calculation parameter to obtain the updated second calculation parameter, and then execute step S309.

[0121] Understandably, the second calculation parameter can be incremented by 1 each time the setting current is adjusted downwards.

[0122] In some embodiments of this application, when both the first and second calculation parameters of the above embodiments have been updated, the setting current has been adjusted both upwards and downwards, indicating that the required setting current has been found. At this time, the final setting current can be determined. Specifically, the process of determining the final setting current of TBJ by calculating the operating current and the operating time of the setting current in step S140 is as follows: Figure 4 As shown, it may include:

[0123] Step S401: Calculate the latest operating current of TBJ based on the setting current, and determine the operating time of the operating current.

[0124] Step S402: Determine whether the peak current of TBJ in zero-state response when one point of its input circuit is grounded is greater than the operating current. If yes, proceed to step S403; otherwise, proceed to step S405.

[0125] Step S403: Determine the duration of the current higher than the operating current in the actual current flowing through TBJ under the zero-state response when one point of the input circuit of TBJ is grounded.

[0126] Step S404: Determine whether the duration is less than the action time. If yes, proceed to step S405; otherwise, proceed to step S407.

[0127] Step S405: Perform a refusal to operate on TBJ and determine whether the operating current is greater than the preset ratio of the tripping current. If yes, proceed to step S406; otherwise, proceed to step S410.

[0128] Step S406: Determine the current setting current as the final setting current of TBJ.

[0129] Step S407: Increase the setting current by a preset level to obtain the updated setting current.

[0130] Step S408: Add 1 to the first calculation parameter to obtain the updated first calculation parameter.

[0131] The first calculation parameter has a value of 0 during initialization.

[0132] Step S409: Determine whether both the first calculation parameter and the second calculation parameter are greater than 0. If not, proceed to step S401; if yes, proceed to step S412.

[0133] Step S410: Reduce the setting current by a preset level to obtain the updated setting current.

[0134] Step S411: Add 1 to the second calculation parameter to obtain the updated second calculation parameter, and then execute step S409.

[0135] The steps S401-S411 described above correspond one-to-one with steps S301-S311 in the previous embodiments. Please refer to the above description for details, which will not be repeated here.

[0136] Step S412: Determine whether the first calculation parameter has changed. If yes, proceed to step S413; otherwise, proceed to step S414.

[0137] Specifically, it is determined whether the first calculated parameter was updated earlier than the second calculated parameter during the update process.

[0138] Step S413: Determine the current setting current as the final setting current of TBJ.

[0139] Furthermore, after determining that the current setting current is the final setting current of TBJ, an alarm can be issued.

[0140] Step S414: Determine the setting current before the first calculation parameter update, which is the final setting current of TBJ.

[0141] Furthermore, after determining that the set current before the first calculation parameter update is the final set current of TBJ, an alarm can be issued.

[0142] In some embodiments of this application, two specific examples of current setting methods for current-blocking relays are shown.

[0143] Case 1:

[0144] The following parameters were selected for TBJ module current setting and verification: 270Ω DC resistance of the circuit breaker trip coil, 9Ω TBJ coil resistance R0, 3Ω equivalent parallel resistance of the TBJ coil R1, 0.741Ω cable length resistance R4, 220V rated DC system voltage U, 40kΩ DC system balance bridge resistance R3, 50μF DC system positive capacitor C1, 50μF DC system negative capacitor C2, and 1H circuit breaker coil inductance L. The TBJ module current curve under these conditions, with one-point grounding of the TBJ input circuit, is shown below. Figure 5 As shown.

[0145] S1: Based on the rated voltage of the DC system and the information of each resistor, the circuit breaker tripping current I2 is calculated to be 0.81A. Based on the circuit breaker tripping current I2, the rated current of the TBJ module is selected as I1 = 1A in 0.5A increments. The TBJ module rated current I1 is set, and the counting parameters m1 = 0 and m2 = 0 are adjusted.

[0146] S2: If m1 = 0 or m2 = 0, the operating current coefficient K = 0.4 is obtained under the rated current I1 of the TBJ module, the operating current of the TBJ module is 0.4A, and the operating time of the TBJ is T1 = 5ms.

[0147] S3: Calculate the peak current of the TBJ block under zero-state response when the TBJ input circuit is grounded at one point, and obtain the peak current Imax = 0.32A.

[0148] S4: Peak current Imax = 0.32A, TBJ block operating current 0.4A, 0.32 < 0.4A.

[0149] S5: Handling the failure to operate principle, the TBJ block operating current is 0.4A, the circuit breaker tripping current I2 is 0.81A, 0.4A < 0.41A, then select the TBJ block rated current I1 = 1A to end, and set the TBJ block operating current to 0.4A.

[0150] Case 2:

[0151] The following parameters were selected for TBJ module current setting and verification: 310Ω DC resistance R2 of the circuit breaker trip coil, 9Ω TBJ coil resistance R0, 3Ω equivalent parallel resistance R1 of the TBJ coil, 0.741Ω cable length resistance R4, 220V rated DC system voltage U, 40kΩ DC system balance bridge resistance R3, 50μF DC system positive capacitor C1, 50μF DC system negative capacitor C2, and 1H circuit breaker coil inductance L. The TBJ module current curve when the TBJ input circuit is grounded at one point is shown below. Figure 6 As shown.

[0152] S1: Based on the rated voltage of the DC system and the information of each resistor, the circuit breaker tripping current I2 is calculated to be 0.70A. Based on the circuit breaker tripping current I2, the rated current of the TBJ module is selected as I1 = 1A in 0.5A increments. The TBJ module rated current I1 is set, and the counting parameters m1 = 0 and m2 = 0 are adjusted.

[0153] S2: If m1 = 0 or m2 = 0, the operating current coefficient K = 0.4 is obtained under the rated current I1 of the TBJ module, the operating current of the TBJ module is 0.4A, and the operating time of the TBJ is T1 = 5ms.

[0154] S3: Calculate the peak current of the TBJ block under zero-state response when the TBJ input circuit is grounded at one point, and obtain the peak current Imax = 0.29A.

[0155] S4: Peak current Imax = 0.29A, TBJ block operating current 0.4A, 0.29A < 0.4A.

[0156] S5: Handling the refusal to operate principle, the TBJ block operating current is 0.4A, the circuit breaker tripping current I2 is 0.70A, 0.4A>0.35A, then update I1=0.5A, m2=1.

[0157] S6: If m1 = 0 is satisfied, the operating current coefficient K = 0.4 is obtained under the rated current I1 of the TBJ module, the operating current of the TBJ module is 0.2A, and the operating time of the TBJ is T1 = 5ms.

[0158] S7: Calculate the peak current of the TBJ block under zero-state response when the TBJ input circuit is grounded at one point, and obtain the peak current Imax = 0.29A.

[0159] S8: Peak current Imax = 0.29A, TBJ block operating current 0.2A, 0.29A > 0.2A.

[0160] S9: Calculate the duration, duration δT=22.6ms-2.8ms=19.8ms, 19.8ms>5ms, then update I1=1A, m1=1.

[0161] S10: If m1 > 0 and m2 > 0, then the TBJ block rated current I1 = 0.5A is selected to end, the TBJ block operating current is set to 0.2A, and a risk alarm is issued (if a single ground fault occurs, it will malfunction).

[0162] The apparatus for setting the current of an anti-pumping lockout relay provided in the embodiments of this application will be described below. The apparatus for setting the current of an anti-pumping lockout relay described below can be referred to in correspondence with the method for setting the current of an anti-pumping lockout relay described above.

[0163] See Figure 7 , Figure 7 This is a schematic diagram of a device for setting the current of an anti-pumping lockout relay, as disclosed in an embodiment of this application.

[0164] like Figure 7 As shown, the device may include:

[0165] The parameter acquisition unit 11 is used to acquire the rated voltage of the substation DC system, the first coil resistance of the anti-pumping interlocking relay TBJ of the relay protection device in the substation DC system, the cable resistance of the substation DC system, the equivalent resistance connected in parallel with the coil of the TBJ, and the second coil resistance of the circuit breaker in the substation DC system.

[0166] The tripping current calculation unit 12 is used to calculate the tripping current of the circuit breaker based on the rated voltage, the first coil resistance, the cable resistance, the equivalent resistance, and the second coil resistance.

[0167] The setting current determining unit 13 is used to determine a setting current that is not less than the tripping current, wherein the setting current is not greater than the upper limit of a preset step difference of the tripping current;

[0168] The final setting current determination unit 14 is used to determine the final setting current of the TBJ by calculating the operating current of the setting current and the operating time of the operating current, performing a refusal to operate on the TBJ.

[0169] Optionally, the final setting current determination unit includes:

[0170] An action information determination unit is used to calculate the latest operating current of the TBJ based on the set current, and to determine the operating time of the operating current.

[0171] The duration determination unit is used to determine the duration of the current that is higher than the operating current in the actual current flowing through the TBJ when the peak current of the TBJ in the zero-state response when the input circuit point of the TBJ is grounded is greater than the operating current.

[0172] The refusal-to-operate processing unit is used to perform refusal-to-operate processing on the TBJ if the duration is less than the operating time, and to determine whether the operating current is greater than a preset ratio of the tripping current.

[0173] The first setting current determination unit is used to determine the current setting current as the final setting current of the TBJ if the operating current is greater than a preset ratio of the tripping current.

[0174] Optionally, the current setting device further includes:

[0175] The jump execution unit is used to perform the steps of refusing to operate the TBJ and determining whether the operating current is greater than the preset ratio of the tripping current when the peak current of the TBJ in the zero state response when the TBJ is grounded at one point in its input circuit is not greater than the operating current.

[0176] Optionally, the current setting device further includes:

[0177] The setting current upgrade unit is used to increase the setting current by a preset level if the duration is not less than the action time, so as to obtain an updated setting current.

[0178] The first calculation parameter update unit is used to add 1 to the first calculation parameter to obtain the updated first calculation parameter, the value of the first calculation parameter at initialization is 0;

[0179] The parameter value judgment unit is used to determine whether the first calculation parameter and the second calculation parameter are both greater than 0. The value of the second calculation parameter is 0 at the time of initialization. If not, the action current calculation unit is executed.

[0180] The operating current calculation unit is used to perform the steps of calculating the latest operating current of the TBJ based on the setting current, and determining the operating time of the operating current.

[0181] Optionally, the current setting device further includes:

[0182] The setting current degradation unit is used to reduce the setting current by a preset level difference if the operating current is not greater than a preset ratio of the tripping current, so as to obtain an updated setting current.

[0183] The second calculation parameter update unit is used to add 1 to the second calculation parameter to obtain the updated second calculation parameter, and to perform the step of determining whether the first calculation parameter and the second calculation parameter are both greater than 0.

[0184] Optionally, the current setting device further includes:

[0185] The second setting current determination unit is used to determine the current setting current as the final setting current of the TBJ when both the first calculated parameter and the second calculated parameter are greater than 0, and if the first calculated parameter is updated earlier than the second calculated parameter during the updating process.

[0186] Optionally, the current setting device further includes:

[0187] The third setting current determination unit is used to determine the setting current before the first calculation parameter is updated as the final setting current of the TBJ when both the first calculation parameter and the second calculation parameter are greater than 0, and if the second calculation parameter is updated earlier than the first calculation parameter during the updating process.

[0188] Optionally, the current setting device further includes:

[0189] The first alarm notification unit is used to issue an alarm notification when both the first calculated parameter and the second calculated parameter are greater than 0, and if the first calculated parameter is updated earlier than the second calculated parameter during the update process, and the current setting current is determined to be the final setting current of the TBJ.

[0190] Optionally, the current setting device further includes:

[0191] The second alarm notification unit is used to issue an alarm notification when both the first calculated parameter and the second calculated parameter are greater than 0, and if the second calculated parameter is updated earlier than the first calculated parameter during the update process, and the setting current before the first calculated parameter is updated is determined to be the final setting current of the TBJ.

[0192] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0193] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0194] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A current setting method for an anti-pumping lockout relay, characterized in that, include: Obtain the rated voltage of the substation DC system, the first coil resistance of the anti-pumping interlocking relay TBJ of the relay protection device in the substation DC system, the cable resistance of the substation DC system, the equivalent resistance connected in parallel with the coil of the TBJ, and the second coil resistance of the circuit breaker in the substation DC system. Based on the rated voltage, the resistance of the first coil, the cable resistance, the equivalent resistance, and the resistance of the second coil, the opening current of the circuit breaker is calculated, and the opening current is: in, The tripping current is... The rated voltage, The resistance of the first coil is... The equivalent resistance is... The resistance of the second coil, The resistance of the cable; A setting current not less than the tripping current is determined, wherein the setting current is not greater than the upper limit of a preset step difference of the tripping current; By calculating the operating current of the set current and the operating time of the operating current, the TBJ is subjected to a failure to operate, and the final set current of the TBJ is determined. The step of calculating the operating current of the set current and the operating time of the operating current to perform anti-operation processing on the TBJ and determine the final set current of the TBJ includes: Based on the set current, calculate the latest operating current of the TBJ and determine the operating time of the operating current; When the peak current of the TBJ under zero-state response when one point of its input circuit is grounded is greater than the operating current, the duration of the current higher than the operating current in the actual current flowing through the TBJ under zero-state response when one point of its input circuit is grounded is determined. If the duration is less than the action time, the TBJ is refused to operate, and it is determined whether the action current is greater than the preset ratio of the tripping current. If the operating current is greater than the preset ratio of the tripping current, the current setting current is determined to be the final setting current of the TBJ.

2. The method according to claim 1, characterized in that, Also includes: When the peak current of the TBJ in zero-state response when it is grounded at one point in its input circuit is not greater than the operating current, the steps of performing the TBJ refusal to operate and determining whether the operating current is greater than the preset ratio of the tripping current are executed.

3. The method according to claim 2, characterized in that, Also includes: If the duration is not less than the action time, the setting current is increased by one preset level to obtain an updated setting current; Add 1 to the first calculation parameter to obtain the updated first calculation parameter, the value of the first calculation parameter at initialization is 0; Determine whether both the first calculation parameter and the second calculation parameter are greater than 0. The value of the second calculation parameter at initialization is 0. If not, then perform the steps of calculating the latest operating current of the TBJ based on the set current and determining the operating time of the operating current.

4. The method according to claim 3, characterized in that, Also includes: If the operating current is not greater than the preset ratio of the tripping current, the setting current is reduced by one preset level difference to obtain an updated setting current. Add 1 to the second calculation parameter to obtain the updated second calculation parameter, and then perform the step of determining whether both the first calculation parameter and the second calculation parameter are greater than 0.

5. The method according to claim 3 or 4, characterized in that, Also includes: When both the first calculated parameter and the second calculated parameter are greater than 0, if the first calculated parameter is updated earlier than the second calculated parameter during the update process, the current setting current is determined to be the final setting current of the TBJ.

6. The method according to claim 3 or 4, characterized in that, Also includes: When both the first calculated parameter and the second calculated parameter are greater than 0, if the second calculated parameter is updated earlier than the first calculated parameter during the update process, the setting current before the first calculated parameter is updated is determined to be the final setting current of the TBJ.

7. The method according to claim 5, characterized in that, When both the first calculated parameter and the second calculated parameter are greater than 0, if the first calculated parameter is updated earlier than the second calculated parameter during the update process, after determining that the current setting current is the final setting current of the TBJ, the method further includes: Issue an alarm.

8. The method according to claim 6, characterized in that, When both the first calculated parameter and the second calculated parameter are greater than 0, if during the update process, the second calculated parameter is updated earlier than the first calculated parameter, and the setting current before the update of the first calculated parameter is determined to be the final setting current of the TBJ, the method further includes: Issue an alarm.

9. A current setting device for an anti-pumping lockout relay, characterized in that, The current setting method for the anti-pumping lockout relay as described in claim 1, the device comprising: The parameter acquisition unit is used to acquire the rated voltage of the substation DC system, the first coil resistance of the anti-pumping interlocking relay TBJ of the relay protection device in the substation DC system, the cable resistance of the substation DC system, the equivalent resistance connected in parallel with the coil of the TBJ, and the second coil resistance of the circuit breaker in the substation DC system. The tripping current calculation unit is used to calculate the tripping current of the circuit breaker based on the rated voltage, the resistance of the first coil, the cable resistance, the equivalent resistance, and the resistance of the second coil. A setting current determining unit is used to determine a setting current that is not less than the tripping current, wherein the setting current is not greater than the upper limit of a preset step difference of the tripping current; The final setting current determination unit is used to determine the final setting current of the TBJ by calculating the operating current of the setting current and the operating time of the operating current, performing a failure-to-operate process on the TBJ.

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