Non-power-off protection device replacement system

Abstract

The invention discloses an uninterruptible power protection device replacement system, and relates to the field of power protection devices. The sampling access module is used for connecting a current sampling loop of a temporary protection device to a secondary side of a current transformer in parallel through an isolation transmitter, and connecting a voltage sampling loop to a secondary side of a voltage transformer in parallel through a high-resistance isolation circuit; the parameter monitoring module is used for acquiring a temporary and old protection device homologous current phase difference and monitoring a common-mode interference voltage and an environment temperature change rate; the fusion calculation module is used for calculating a comprehensive protection coefficient; the locking control module is used for remotely locking an old protection device to enter a logic bypass when the comprehensive protection coefficient is stable and meets a preset condition; the safety monitoring module is used for monitoring residual leakage current and protection coefficient change in a logic bypass state; and the removal execution module is used for physically removing the old protection device and the wires when the conditions are met. The protection state is comprehensively evaluated by collecting operation parameters, the old protection device is remotely switched, the operation condition is continuously monitored, and the safety of the replacement process of the protection device is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power protection devices, in particular to a non-power-off protection device replacement system. BACKGROUND

[0002] With the improvement of the automation level of the power system, the replacement and maintenance of protection devices, as an important part of ensuring the safe operation of power equipment, have become a key link in power operation and maintenance. Traditional protection device replacement usually requires power outage, resulting in power interruption and affecting the continuity and reliability of the system. To solve this problem, existing technologies have proposed methods for replacing protection devices without power outage. However, existing solutions often have the following shortcomings: complex sampling circuit connection, inaccurate monitoring of homologous current phase difference, insufficient consideration of environmental factors, imperfect locking control and safety removal process, etc., making it difficult to meet the requirements of high reliability and real-time performance, and there is an urgent need for a more perfect non-power-off protection device replacement system. SUMMARY

[0003] Based on the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a non-power-off protection device replacement system to solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solution: a non-power-off protection device replacement system, comprising:

[0005] A sampling connection module is used to connect the current sampling circuit of the temporary protection device in parallel through an isolation transmitter and the secondary side of the current transformer of the target electrical circuit, and to connect the voltage sampling circuit of the temporary protection device in parallel through a high-resistance isolation circuit and the secondary side of the voltage transformer of the target electrical circuit;

[0006] A parameter monitoring module is used to obtain the homologous current phase difference between the temporary protection device after operation and the old protection device in the target electrical circuit, monitor the common-mode interference voltage amplitude between the sampling circuit of the temporary protection device and the sampling circuit of the old protection device, and monitor the working environmental temperature change rate of the isolation transmitter;

[0007] A fusion calculation module is used to calculate a comprehensive protection coefficient based on the monitored homologous current phase difference, common-mode interference voltage amplitude and working environmental temperature change rate of the isolation transmitter through a data fusion algorithm;

[0008] A locking control module is used to remotely issue a safety locking instruction to the logic processing unit of the old protection device when the comprehensive protection coefficient is stable and continuously meets the first preset condition, so that the old protection device enters a logic bypass state;

[0009] A safety monitoring module is used to monitor the residual leakage current value of the output circuit of the old protection device and the change amplitude of the comprehensive protection coefficient after the old protection device enters the logic bypass state;

[0010] Remove the execution module: for when the residual leakage current value is less than the second preset value and the change amplitude of the comprehensive protection coefficient meets the third preset condition, physically remove the old protection device and its associated wiring.

[0011] The application further provides that the calculation logic of the comprehensive protection coefficient is: CPC=k1· Wherein, CPC is the comprehensive protection coefficient, ΔΦ is the homologous current phase difference, V cm is the common-mode interference voltage amplitude, V max is the preset maximum allowed common-mode interference voltage threshold, ΔT is the working environment temperature change of the isolation transmitter, Δt is the time change, (ΔT / Δt) is the working environment temperature change rate of the isolation transmitter, is the maximum allowed temperature change rate, k1, k2 and k3 are weight coefficients.

[0012] The application further provides that the remote issuance of the safety locking instruction is transmitted through the existing station control layer communication network or the dedicated encrypted wireless channel of the target electrical circuit.

[0013] The application further provides that the logic bypass state includes that the input sampling channel of the old protection device remains open, the output of the protection function element is in the disabled state, and the trip output loop and the signal output loop are disconnected through internal electronic switches.

[0014] The application further provides that the first preset condition is that the comprehensive protection coefficient continuously locates in the preset comprehensive protection coefficient numerical interval range during operation, and the time length of the continuous state is greater than or equal to the first preset time length.

[0015] The application further provides that the third preset condition is that the change amplitude of the comprehensive protection coefficient is less than or equal to the preset maximum tolerance threshold within the second preset time length.

[0016] The application further provides that the residual leakage current value selects a detection mode according to the system grounding system:

[0017] When it is a neutral point grounding system, the residual current value at the outlet end of the target electrical circuit is obtained through a zero sequence current sensor;

[0018] When it is a neutral point ungrounded system, a high-impedance differential probe is used to measure the potential difference across the trip output contact of the old protection device, and the residual leakage current value is calculated through an equivalent impedance model according to the obtained trip output contact measurement potential difference;

[0019] The calculation logic of the residual leakage current value is: Wherein, I res is the residual leakage current value, V diffMeasuring potential difference, Z for trip output contact cal Setting the equivalent impedance reference value.

[0020] The application is further configured that the step of physically removing the old protection device and its associated wiring includes:

[0021] Disconnecting the DC power supply of the old protection device;

[0022] When it is a neutral grounding system, confirming that the residual leakage current value is less than a second preset value;

[0023] When it is a neutral ungrounding system, activating the grounding monitoring loop arranged at both ends of the output contact of the old protection device, confirming that the insulation impedance detected by the grounding monitoring loop is greater than or equal to a fourth preset value, and ensuring that no parasitic loop exists during the removal operation;

[0024] Removing the AC voltage wiring and the current wiring of the old protection device.

[0025] The application is further configured that the new and old protection devices trigger sampling based on the same time synchronization signal, the time synchronization signal is provided by the Beidou satellite navigation system and the global positioning system timing system or the IEEE1588 precision clock protocol based on the station control layer communication network, and the sampling time deviation of the new and old devices is less than or equal to a preset time deviation threshold, thereby realizing the monitoring of the homologous current phase difference.

[0026] The application is further configured that the system further includes a fault early warning module for generating a warning signal and interrupting the system operation process when any independent event is detected, and the independent event includes:

[0027] The integrated protection coefficient exceeds the preset integrated protection coefficient value interval range for three times in succession within a first preset time length;

[0028] The instantaneous temperature change rate of the working environment of the isolation transmitter breaks through a preset maximum allowed temperature change rate.

[0029] The application provides a non-power protection device replacement system, which comprises a sampling access module, a parameter monitoring module, a fusion calculation module, a locking control module and a safety monitoring module.

[0030] 1. The parameter monitoring module can obtain the homologous current phase difference between the temporary protection device and the old protection device in the target electrical circuit, monitor the common-mode interference voltage amplitude between the sampling circuit of the temporary protection device and the sampling circuit of the old protection device, and monitor the working environment temperature change rate of the isolation transmitter.

[0031] 2. The fusion calculation module can calculate the comprehensive protection coefficient based on the monitored homologous current phase difference, common-mode interference voltage amplitude and isolation transmitter working environment temperature change rate.

[0032] 3. The locking control module can remotely issue a safety locking instruction to the logic processing unit of the old protection device when the comprehensive protection coefficient is stable and continuously meets the first preset condition, so that the old protection device enters a logic bypass state.

[0033] The above description is only a summary of the technical scheme of the application, and the technical means of the application can be implemented according to the content of the specification, and the above and other purposes, characteristics and advantages of the application can be more obvious and easy to understand. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to make the technical solutions in the embodiments of the present application clearer, the accompanying drawings needed in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort. In the drawings:

[0035] Figure 1 A principle block diagram of the UPS protection device replacement system shown for an exemplary embodiment of the present application;

[0036] Figure 2 A flow chart of the implementation steps of the UPS protection device replacement system shown for an exemplary embodiment of the present application;

[0037] Figure 3 A physical removal operation step flow chart. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be described hereinafter with reference to the drawings and preferred embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification. The present application can also be implemented or applied by other different specific embodiments, and the details in the present specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, and are not intended to limit the protection scope of the present application.

[0039] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The type, number and proportion of the components when actually implemented can be arbitrarily changed, and the component layout type can also be more complex.

[0040] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application, however, it is obvious for those skilled in the art that the embodiments of the present application can be implemented without these specific details, and in other embodiments, the known structures and devices are shown in the form of block diagrams instead of details to avoid making the embodiments of the present application difficult to understand.

[0041] The UPS protection device replacement system, as shown in Figure 1 and Figure 2 , includes:

[0042] A sampling access module is configured to connect a current sampling circuit of the temporary protection device in parallel with a secondary side of a current transformer of a target electrical circuit through an isolation transmitter, and connect a voltage sampling circuit of the temporary protection device in parallel with a secondary side of a voltage transformer of the target electrical circuit through a high-resistance isolation circuit;

[0043] A parameter monitoring module is configured to acquire a homologous current phase difference between the temporary protection device and an old protection device in the target electrical circuit after the temporary protection device is put into operation, monitor a common-mode interference voltage amplitude between a sampling circuit of the temporary protection device and a sampling circuit of the old protection device, and monitor a working environment temperature change rate of the isolation transmitter;

[0044] A fusion calculation module is configured to calculate a comprehensive protection coefficient based on the monitored homologous current phase difference, common-mode interference voltage amplitude and working environment temperature change rate of the isolation transmitter, and through a data fusion algorithm;

[0045] A lockout control module is configured to remotely issue a safety lock instruction to a logic processing unit of the old protection device to make the old protection device enter a logic bypass state when the comprehensive protection coefficient is stable and continuously meets a first preset condition.

[0046] A safety monitoring module is configured to monitor a residual leakage current value of an output circuit of the old protection device and a change amplitude of the comprehensive protection coefficient after the old protection device enters the logic bypass state.

[0047] A removal execution module is configured to physically remove the old protection device and associated wiring when the residual leakage current value is less than a second preset value and the change amplitude of the comprehensive protection coefficient meets a third preset condition.

[0048] The application further provides that the calculation logic of the comprehensive protection coefficient is: wherein, CPC is the comprehensive protection coefficient, ΔΦ is the homologous current phase difference, V cm is the common-mode interference voltage amplitude, V max is a preset maximum allowed common-mode interference voltage threshold, ΔT is a working environment temperature change amount of the isolation transmitter, Δt is a time change amount, (ΔT / Δt) is a working environment temperature change rate of the isolation transmitter, The maximum allowable temperature rate of change, k1, k2 and k3 are weight coefficients; specifically, in the present embodiment, in order to realize safe replacement of the old protection device in the target electrical circuit under the condition of uninterrupted power supply, a comprehensive protection coefficient integrating multiple parameter state quantities is used for operation state judgment and protection switching judgment; the comprehensive protection coefficient is used to reflect the stability and safety margin of the current operation state, and the greater the value of the comprehensive protection coefficient, the more stable the system; the homologous current phase difference represents the phase sampling error of the temporary protection device and the old protection device to the same current signal, reflects the current sampling consistency of the new and old protection devices, and the ideal state is that the two are synchronized, i.e. the phase difference is close to zero, and the smaller the homologous current phase difference value, the better the synchronization performance; the common-mode interference voltage amplitude represents the difference voltage between the two sampling paths caused by ground potential drift or common-mode interference, reflects the common-mode interference degree between the voltage sampling systems of the new and old devices, and the closer the common-mode interference voltage amplitude to zero, the better the isolation effect and the lower the interference; the isolation transmitter working environment temperature rate of change represents the rate of change of the temperature of the isolation transmitter over time when it is running, reflects the thermal stability of the working environment of the field isolation transmitter, and the smaller the rate of change, the more stable the system and the less affected by environmental fluctuations; k1, k2 and k3 are used to control the contribution of the homologous current phase difference, the common-mode interference voltage amplitude and the isolation transmitter working environment temperature rate of change to the calculation of the comprehensive protection coefficient, and the value range is [0, 1], and the sum of k1, k2 and k3 is 1; through the integrated analysis of current synchronization, voltage interference degree and environmental stability, quantitative evaluation of the operation state of the temporary and old protection devices is realized.

[0049] The application is further configured that the remote security locking instruction is transmitted through an existing station control layer communication network or a dedicated encrypted wireless channel of the target electric circuit; specifically, in the embodiment, to realize the safety logic switching of the old protection device under the non-power-off state, the application sets a mechanism for remotely issuing the security locking instruction, the instruction is generated by the upper host control system, and can be transmitted to the old protection device in two ways; one is that if the target electric circuit has accessed the station control layer communication network, such as the industrial Ethernet based on IEC 61850, IEC 104, DNP3.0 or Modbus TCP protocol, the locking instruction can be uploaded to the background host node through the temporary protection device or the SCADA / DCS system, and packaged as a GOOSE message or a standard TCP data frame, and transmitted to the logic processing unit of the old protection device by the station control system, the instruction content includes device identification, command type, time stamp and CRC check field, and supports TLS1.3 channel encryption and ECC digital signature verification, to ensure the reliability and tamper resistance of the communication; the second is that if the station control network is unavailable or unstable, the system will establish a dedicated encrypted wireless channel through the integrated embedded wireless module to transmit the instruction, such as supporting 4G Cat1, NB-IoT and LoRa, etc., the locking instruction is encrypted by a symmetric encryption algorithm before being sent, and at the same time, the identity verification capability is enhanced by combining the one-time token and the pre-shared key mechanism; after the old protection device receives the instruction, it automatically performs content verification, time stamp verification and source identity confirmation, and after the verification is passed, it enters the logic bypass state, including: keeping the input sampling channel enabled, disabling all protection function logics, disconnecting the trip output and alarm path; to improve the safety and stability of the execution process, the communication dual-channel redundancy configuration is supported, and a failure protection mechanism is provided: if no locking confirmation feedback is received within a set time, the replacement operation will be suspended and manual intervention will be prompted, to ensure the safety and controllability of the whole process of remote replacement.

[0050] The application is further provided that the logic bypass state includes: the input sampling channel of the old protection device remains open, the output of the protection function element is in a disabled state, and the trip output loop and the signal output loop are disconnected through internal electronic switches; Specifically; in the embodiment, after the old protection device enters the logic bypass state, the input sampling channel remains open to ensure uninterrupted real-time monitoring of key parameters such as current and voltage; at the same time, the output of the protection function element is disabled by software and hardware means to prevent any misoperation or control signal output; in order to completely cut off the control influence of the old protection device on the electric circuit, the trip output loop and the signal output loop are disconnected through the internal integrated high-reliability electronic switch, and the electronic switch is controlled by the logic processing unit, which can quickly and reliably complete the disconnection action, cut off the physical trip command and signal feedback, and ensure that the old protection device only has monitoring function in the bypass state and does not have control influence on the power grid; after receiving the remote locking instruction, the logic bypass state switching is completed in the order of keeping the sampling channel open first, then disabling the protection output, and finally disconnecting the trip and signal loop; the redundant isolation design is adopted to ensure the stability of data acquisition and the safe disconnection of the output loop in the bypass state, and remote state feedback monitoring is supported, thereby ensuring the safe bypassing of the old protection device under the condition of uninterrupted power supply and the smooth implementation of subsequent removal operation.

[0051] The application is further provided that the first preset condition is that the comprehensive protection coefficient continuously locates in a preset comprehensive protection coefficient numerical interval range during operation, and the time length of the continuous state is greater than or equal to a first preset time length; Specifically, in the embodiment, the comprehensive protection coefficient is obtained by fusing the common source current phase difference, the common mode interference voltage amplitude and the environmental temperature change rate, and reflects the overall operation state of the system, in order to ensure the system stability and safely switch the old protection device, the first preset condition is set; the first preset condition specifically means that the comprehensive protection coefficient needs to be kept in the preset numerical interval during operation, the interval is determined according to the system operation experience and safety requirements, and is usually a narrow stable range, such as 0.7 to 0.95, to ensure the reliability and stability of the working state of the protection device; at the same time, the stable state needs to last for or more than the first preset time length, which can be set according to the actual power grid characteristics and device response speed, and is generally not less than several minutes, such as 5 minutes, to avoid misjudgment of the system state due to short-time fluctuation; only when the comprehensive protection coefficient continuously meets the specified time length in the numerical interval, the first preset condition is determined to be established, thereby triggering the subsequent safety locking and logic bypass operation, to ensure the safety and accuracy of the protection device replacement process; through real-time sampling and fusion calculation, it is continuously monitored and judged whether the comprehensive protection coefficient meets the above condition, and if it meets, the subsequent logic bypass switching operation is triggered, thereby effectively improving the reliability and safety of the uninterrupted replacement process.

[0052] The third preset condition is that a variation range of the comprehensive protection coefficient is less than or equal to a preset maximum tolerance threshold within a second preset time length; specifically, in the embodiment, the third preset condition is used to evaluate the stability of the comprehensive protection coefficient, and ensures that the old protection device is safely removed in the logic bypass state; the third preset condition specifically means that the variation range of the comprehensive protection coefficient must be kept within the preset maximum tolerance threshold within the specified second preset time length; the second preset time length is generally set according to system response characteristics and stability requirements, and is usually several minutes to tens of minutes, so as to ensure that the monitored protection coefficient fluctuation is a small change within the system normal operation range rather than an abnormal fluctuation; the maximum tolerance threshold is determined according to the device performance and the operating environment, and is intended to exclude misjudgments caused by external interference or short-time disturbance, and to ensure that the variation of the comprehensive protection coefficient is within a safe allowable range; when the fluctuation range of the comprehensive protection coefficient within the time length does not exceed the tolerance threshold, the system considers that the protection state is stable, the third preset condition is met, and subsequent protection device physical removal operations are supported, thereby ensuring the safety and reliability of the replacement process.

[0053] The application further provides that the residual leakage current value is selected according to the system grounding system:

[0054] When it is a neutral point grounding system, the residual current value of the outlet end of the target electrical circuit is obtained through a zero sequence current sensor;

[0055] When it is a neutral point ungrounded system, a high-impedance differential probe is used to cross the trip output contact of the old protection device to measure a potential difference, and the residual leakage current value is calculated through an equivalent impedance model according to the obtained trip output contact measurement potential difference;

[0056] The calculation logic of the residual leakage current value is: wherein, I res is the residual leakage current value, V diff is the trip output contact measurement potential difference, Z cal is a preset equivalent impedance reference value; specifically, in the embodiment, the detection mode of the residual leakage current is selected according to the grounding system of the system; for a neutral point grounding system, a zero sequence current sensor installed at the outlet end of the target electrical circuit is used to directly obtain the residual leakage current value, which can reflect the unbalanced leakage current change in the circuit in real time, ensuring the accuracy and timeliness of the monitoring data; for a neutral point ungrounded system, since the zero sequence current sensor cannot directly and effectively detect the leakage current, a high-impedance differential probe is used to cross the trip output contact of the old protection device, and the residual leakage current is indirectly reflected by measuring the potential difference between the trip output contacts; the measured potential difference is calculated through a preset equivalent impedance model, and the preset equivalent impedance reference value Z calReflects the actual electrical impedance characteristics in the measurement circuit, the value is determined according to the actual electrical equipment and line characteristics, can be obtained through calibration and experimental data, such as through on-site measurement under the condition of known standard load or reference current, combined with experimental data analysis, adjust and confirm the preset equivalent impedance reference value, ensure that the calculated residual leakage current value truly reflects the system state; Through the above detection and calculation method, the system can accurately obtain the residual leakage current for different grounding modes, support the subsequent safety judgment and protection device replacement operation.

[0057] The application is further provided that the step of physically removing the old protection device and its associated wiring, such as Figure 3 As shown, it includes:

[0058] Disconnect the DC power supply of the old protection device;

[0059] When it is a neutral point grounding system, confirm that the residual leakage current value is less than the second preset value;

[0060] When it is a neutral point ungrounded system, activate the grounding monitoring loop set at both ends of the output contact of the old protection device, confirm that the insulation impedance detected by the grounding monitoring loop is greater than or equal to the fourth preset value, and ensure that there is no parasitic loop during the removal operation;

[0061] The AC voltage and current connections of the old protection device are removed; specifically, in the present embodiment, the operation steps of physically removing the old protection device and its associated connections are as follows: first, the DC power supply of the old protection device is disconnected, the internal control and auxiliary power supply are cut off, the device is ensured to be no longer in the working state, and misoperation and safety hazards are avoided; second, for the neutral point grounding system, the residual leakage current value needs to be confirmed to have been reduced to below a second preset threshold value before removal, indicating that there is no abnormal leakage current in the circuit, and the safety of the subsequent removal operation is ensured; for the neutral point ungrounded system, since the leakage current detection is more difficult, the present embodiment sets a special ground monitoring loop, which is connected to the output contact of the old protection device, and the monitoring loop needs to be activated before removal to measure the insulation impedance of the loop in real time. Only when the measured insulation impedance is not less than a fourth preset threshold value, the physical removal is allowed to be performed, ensuring that there is no parasitic current or potential leakage circuit in the removal process, and the operation safety is ensured; finally, after confirming that the above conditions are met, the AC voltage and current connections of the old protection device are removed, and the physical removal step is completed; the second preset value, i.e., the residual leakage current threshold value, can be determined according to the rated current capacity of the target electrical circuit, the technical parameters of the protection device, and the safety standards, and is usually set to not exceed a certain safety leakage limit to ensure that there is no high leakage risk when the protection device is safely removed; the fourth preset value, i.e., the insulation impedance threshold value, can be set according to the insulation performance standards of electrical equipment and the actual test data on site, and the common value range is several megohms or more to ensure that there is no parasitic circuit during the removal operation, and to prevent electric shock or equipment damage; this process must be strictly performed according to the operation specification to avoid short circuit, misconnection or equipment damage, and to ensure the safety and reliability of the entire replacement process.

[0062] The application is further provided that the new and old protection devices trigger sampling based on the same time synchronization signal provided by the Beidou satellite navigation system and the global positioning system timing system or the IEEE 1588 precision clock protocol based on the station control layer communication network, and the sampling time deviation of the new and old devices is less than or equal to a preset time deviation threshold, realizing the monitoring of the homologous current phase difference; specifically, to ensure the high-precision time synchronization of the sampling of the new and old protection devices, the Beidou satellite navigation system and the global positioning system timing system are preferentially used to provide a unified time reference, which is suitable for most outdoor and high-rise building environments; for weak signals or special environments, the IEEE 1588 precision clock protocol in the target electrical circuit station control layer communication network is used to realize high-precision network synchronization, the protocol has been widely used in power systems, can effectively resist network delay and jitter, ensure that the synchronization error is controlled within microseconds, and meet the sampling time sequence alignment requirements; the sampling trigger is completed through a synchronous trigger signal line or a network time protocol based on IEEE 1588, and is equipped with a dynamic drift correction and error detection mechanism, which detects the time deviation of the sampling signals of the new and old protection devices in real time, detects errors in combination with the preset time deviation threshold, and automatically sends an alarm prompt when the time deviation exceeds the threshold; to ensure sampling synchronization, the sampling trigger time sequence is adjusted according to a preset compensation algorithm, the adjustment mode includes delaying the trigger or triggering the sampling signal in advance, and the sampling action is accurately performed within the allowable range, which ensures the stability and accuracy of the sampling synchronization, effectively supports the safe switching and stable operation of the subsequent protection device; the above scheme can improve the calculation accuracy of the comprehensive protection coefficient, and ensure the safety and stability of the non-power protection device replacement process.

[0063] The application is further provided that the system further comprises a fault warning module for generating a warning signal and interrupting the system operation process when any independent event is detected, the independent event including:

[0064] The comprehensive protection coefficient exceeds the preset comprehensive protection coefficient value range for three consecutive times within the first preset time length;

[0065] The instantaneous temperature change rate of the isolation transmitter working environment breaks through the preset maximum allowable temperature change rate; specifically, in the embodiment, the fault warning module can generate a warning signal and interrupt the system operation process when any independent event is detected by monitoring the key parameters of the system in real time; the independent event includes: when the comprehensive protection coefficient exceeds the preset comprehensive protection coefficient value range for three consecutive times within the first preset time length, or when the instantaneous temperature change rate of the isolation transmitter working environment breaks through the preset maximum allowable temperature change rate, the system will trigger the warning mechanism; specifically, the system determines whether an abnormality occurs through a preset threshold, and when the preset condition is exceeded, the fault warning module will immediately send an alarm signal to stop the current operation process, ensuring the safety of the equipment and the stable operation of the system.

[0066] The above-described embodiments can be implemented in part or in whole through software, hardware, firmware, or any combination thereof. When implemented in software, the above-described embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded into a computer, all or part of the flow or function described in the embodiments of the present application are produced. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center through wired (for example, infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium accessible by a computer or a data storage device such as a server, data center, etc. containing one or more available medium collections. The available medium can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), an optical medium (for example, DVD), or a semiconductor medium. The semiconductor medium can be a solid-state disk.

[0067] It should be understood that the term "and / or" herein merely describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it, but it can also represent an "and / or" relationship, which can be understood according to the context before and after it.

[0068] In this application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0069] It should be understood that in various embodiments of the present application, the size of the sequence number of the above-described processes does not mean the order of execution, and the execution order of the processes should be determined according to their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0070] Those skilled in the art can clearly understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0071] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0072] In several embodiments provided in the present application, it should be understood that the disclosed system can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0073] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0074] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0075] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0076] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An uninteruptible power supply replacement system, characterized by, The method comprises the following steps: a sampling access module: connecting the current sampling circuit of the temporary protection device in parallel through the secondary side of the current transformer of the target electrical circuit and the isolation transmitter, and connecting the voltage sampling circuit of the temporary protection device in parallel through the secondary side of the voltage transformer of the target electrical circuit and the high-impedance isolation circuit; a parameter monitoring module: obtaining the homologous current phase difference between the temporary protection device after operation and the old protection device in the target electrical circuit, monitoring the common-mode interference voltage amplitude between the sampling circuit of the temporary protection device and the sampling circuit of the old protection device, and monitoring the working environment temperature change rate of the isolation transmitter; a fusion calculation module: calculating a comprehensive protection coefficient based on the monitored homologous current phase difference, common-mode interference voltage amplitude and working environment temperature change rate of the isolation transmitter through a data fusion algorithm; a lockout control module: when the comprehensive protection coefficient is stable and continuously meets the first preset condition, remotely issuing a safety lockout instruction to the logic processing unit of the old protection device, so that the old protection device enters a logic bypass state; a safety monitoring module: monitoring the residual leakage current value of the output circuit of the old protection device and the change amplitude of the comprehensive protection coefficient after the old protection device enters the logic bypass state; a removal execution module: when the residual leakage current value is less than the second preset value and the change amplitude of the comprehensive protection coefficient meets the third preset condition, physically removing the old protection device and its associated wiring.

2. The replacement system for an un-interruptible power supply according to claim 1, wherein, The calculation logic of the comprehensive protection coefficient is: Wherein, CPC is the comprehensive protection coefficient, ΔΦ is the homologous current phase difference, V cm is the common-mode interference voltage amplitude, V max is the preset maximum allowed common-mode interference voltage threshold, ΔT is the working environment temperature variation of the isolation transmitter, Δt is the time variation, (ΔT / Δt) is the working environment temperature variation rate of the isolation transmitter, is the maximum allowed temperature variation rate, k1, k2 and k3 are weight coefficients.

3. The replacement system for an un-interruptible power supply of claim 1, wherein, The remote safety lockout instruction is transmitted through the existing station control layer communication network or a dedicated encrypted wireless channel of the target electrical circuit.

4. The replacement system for an un-interruptible power supply of claim 1, wherein, The logic bypass state includes that the input sampling channel of the old protection device remains open, the protection function element output is in a disabled state, and the trip output circuit and the signal output circuit are disconnected through internal electronic switches.

5. The replacement system for an un-interruptible power supply of claim 1, wherein, The first preset condition is that the comprehensive protection coefficient continuously locates within a preset comprehensive protection coefficient value interval during operation, and the duration of this state is greater than or equal to a first preset time length.

6. The replacement system for an un-interruptible power supply of claim 1, wherein, The third preset condition is that the change amplitude of the comprehensive protection coefficient is less than or equal to a preset maximum tolerance threshold within a second preset time length.

7. The replacement system for an un-interruptible power supply of claim 1, wherein, The residual leakage current value is detected in different ways according to the system grounding mode: When it is a neutral point grounding system, the residual current value at the outlet end of the target electrical circuit is obtained through a zero sequence current sensor; When it is a neutral point ungrounded system, a high-impedance differential probe is used to measure the potential difference across the trip output contact of the old protection device, and the residual leakage current value is calculated through an equivalent impedance model according to the measured potential difference of the trip output contact; The calculation logic of the residual leakage current value is: Wherein, I res is the residual leakage current value, V diff is the trip output contact measured potential difference, Z cal is the preset equivalent impedance reference value.

8. The replacement system for an un-interruptible power supply of claim 1, wherein, The step of physically removing the old protection device and its associated wiring comprises: disconnecting the DC power supply of the old protection device; when it is a neutral point grounding system, confirming that the residual leakage current value is less than the second preset value; when it is a neutral point ungrounded system, activating the grounding monitoring circuit arranged at both ends of the output contact of the old protection device, confirming that the insulation impedance detected by the grounding monitoring circuit is greater than or equal to a fourth preset value, and ensuring that there is no parasitic circuit during the removal operation; removing the AC voltage wiring and current wiring of the old protection device.

9. The replacement system for an uninteruptable power supply of claim 1, wherein, The new and old protection devices trigger sampling based on the same time synchronization signal provided by a Beidou satellite navigation system and a global positioning system timing system or an IEEE 1588 precision clock protocol based on a station control layer communication network, and the sampling time deviation of the new and old devices is less than or equal to a preset time deviation threshold, so that the monitoring of the homologous current phase difference is realized.

10. The replacement system for an uninteruptable power supply of claim 1, wherein, The system further comprises a fault early warning module for generating a warning signal and interrupting the system operation process when any independent event is detected, the independent event including: The integrated protection coefficient exceeds the preset integrated protection coefficient value range for three times in succession within the first preset time length; The instantaneous temperature change rate of the working environment of the isolation transmitter breaks through the preset maximum allowable temperature change rate.

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