Detection and calibration system for on-line insulation device of direct current system

Abstract

The invention discloses a detection and calibration system for an online insulation device of a direct current system, and belongs to the technical field of detection of insulation devices of direct current systems. The voltage, the distributed capacitance and the balance bridge resistance of the current direct current system, the resistance and the distributed capacitance of the grounding resistor, and the mode and the voltage that the load current and the alternating current are serially connected into the direct current system are simulated, and the sensitivity and the accuracy of the on-line insulation device are calibrated. The insulation device detection module detects various parameters, sensitivity parameters, insulation parameters and distributed capacitance parameters of a DC system insulation device, searches for ground faults on site, judges the faults and locates the faults on a branch, and the fault site replacement module performs temporary replacement when a DC system power supply of the DC system insulation monitoring device fails. Parameters of a direct current system can be detected, the sensitivity and accuracy of an online insulation device can be calibrated, and a real fault and a fault point can be correctly judged and positioned.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of detection of insulation devices of a direct current system, and particularly relates to a detection and calibration system for online insulation devices of a direct current system. BACKGROUND

[0002] At present, the detection and calibration of insulation devices of a direct current system in a substation site are difficult to carry out, and in general, they are sent back to the production manufacturer or directly replaced, thus bringing great workload and risk.

[0003] There are many manufacturers of insulation devices of a direct current system, and the performance functions of various manufacturers are different. Some have dead angle zones in the insulation detection of a direct current system. When a loop of a direct current system branch appears, two groups of power sources are mutually connected, the distributed capacitance is relatively large, and alternating current is connected into the direct current system. The insulation monitoring of some manufacturers has the phenomenon of incorrect judgment or inability to judge, which brings the work of the patrol members and maintenance members into a misunderstanding, increases the workload, and makes the fault exist for a longer time.

[0004] Because various grounding faults cannot be simulated under the condition that the direct current system is normally operated, the function whether the calibration and detection are perfect cannot be calibrated and detected on site. The traditional pull-back loop method is used. When a grounding fault of a direct current system occurs and the online insulation cannot be found or other methods cannot be found, the branch is pulled away from the direct current system for a short time to separate the branch from the direct current system, and whether the fault is in the branch is judged, which makes the protection equipment of the branch lose power for a short time. SUMMARY

[0005] To solve the above problems and technical defects, the application adopts the following technical solution. A detection and calibration system for online insulation devices of a direct current system comprises: A direct current system calibration module is used to establish a simulation system of a simulated direct current system, simulate the voltage, distributed capacitance and balance bridge resistance, resistance and distributed capacitance of a grounding resistance, load current and alternating current connected into the direct current system, and calibrate the sensitivity and accuracy of the online insulation device. An insulation device detection module is used to detect various parameters, sensitivity parameters, insulation parameters and distributed capacitance parameters of the insulation device of the direct current system, find a grounding fault on site, and judge the fault. The fault is positioned on the branch. A fault on-site replacement module is used to temporarily replace the direct current system power supply of the insulation monitoring device of the direct current system when the direct current system power supply of the insulation monitoring device of the direct current system fails.

[0006] Preferably, the direct current system calibration module comprises two groups of separate direct current power sources. The output voltage of each group of direct current power sources is adjustable 20V-286V output. The resistance value of the grounding resistance ranges from 0 to 200KΩ. The branch provided with a plurality of distributed capacitances comprises a single branch line with distributed capacitance and a plurality of loop lines with distributed capacitance.

[0007] Preferably, the fault location is to isolate the target branch and the DC system, to determine whether the DC system ground is isolated, if isolated, the ground fault is on the target branch, otherwise the fault is on other branches.

[0008] Further, the isolation of the target branch and the DC system comprises: The DC output voltage of the insulation device is modulated to be lower than the DC system voltage; The insulation device output end is connected in parallel with the branch switch output end, and the DC system voltage is cut off through the reverse diode, and the DC output voltage of the insulation device is lower than the DC system voltage, and the reverse diode is not conductive; The branch switch is pulled out, the DC system voltage exits the branch, and the insulation device voltage is switched to the branch voltage for power supply, ensuring the operation of the branch load.

[0009] Further, the temporary replacement comprises: The DC output voltage of the insulation device is modulated to be lower than the DC system voltage; The positive and negative poles of the insulation device are connected in parallel with the DC system bus, and the insulation device output end is provided with a reverse diode, the DC system voltage is cut off through the reverse diode, the DC output voltage of the insulation device is lower than the DC system voltage, and the forward direction is not conductive, and no current is generated; The DC system power supply is exited, and the insulation device power supply is switched to the DC system bus, ensuring the power supply of the load current.

[0010] Further, in the fault location and temporary replacement, the DC output voltage of the insulation device is modulated, and the DC output voltage is lower than the DC system voltage by 0.5V.

[0011] Preferably, the DC voltage output range of the insulation device is 1-300V.

[0012] Preferably, it further comprises an AC / DC / AC module for connecting a 12V storage battery, converting AC 220V to DC 12V, converting AC 220V to AC 220V after charging the storage battery, and providing AC 220V output.

[0013] An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to realize the content of the detection and calibration system for the online insulation device of the DC system as described above.

[0014] A computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to realize the content of the detection and calibration system for the online insulation device of the DC system as described above.

[0015] Compared with the prior art, the application has the following beneficial effects: (1) The application can detect various parameters of the insulation device of the DC system, the sensitivity parameter, and the correct judgment of the line selection result and the fault reporting result, which can detect the parameters of the DC system and calibrate the sensitivity and accuracy of the online insulation device; (2) When the online insulation device fails or misreports, and cannot correctly judge and locate the real fault and fault point, the application can quickly judge and find the DC system grounding fault, and can find and locate the fault point of the DC system, and can quickly find the DC system grounding fault such as metal grounding, high impedance grounding, multi-point grounding, single-point grounding, loop grounding and intermittent grounding; (3) The application can temporarily serve as a mobile power supply system, simulate various technologies of system operation mode, establish a simulation DC system simulation system, and when the DC system fails and cannot be powered off, it can be temporarily used instead of the DC system, and output DC adjustable power supply, when the DC system fails and needs to be powered off, it can be used as a temporary power supply, reducing the loss caused by power failure. BRIEF DESCRIPTION OF DRAWINGS

[0016] In the drawings: Figure 1 is a schematic diagram of the system structure of the embodiment of the application; Figure 2 is a schematic diagram of the circuit structure of the embodiment of the application; Figure 3 is a schematic diagram of the device structure of the embodiment of the application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme of the embodiments of the application will be described clearly and completely below in combination with the drawings of the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, not all the embodiments. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations. Embodiment 1

[0018] As shown in Figure 1 and Figure 2 , a detection and calibration system for online insulation device of DC system, characterized in that, comprising: A DC system calibration module is used to establish a simulation DC system simulation system, simulate the voltage, distributed capacitance and balance bridge resistance, resistance and distributed capacitance of grounding resistance, load current and AC current series into the DC system mode and voltage of the current DC system, and calibrate the sensitivity and accuracy of the online insulation device; The direct current system calibration module comprises two groups of separate direct current power supplies, each group of direct current power supply has adjustable 20V-286V output voltage, and the ground resistance has a resistance range of 0-200KΩ. The branch with the distributed capacitance comprises a single branch with the distributed capacitance and a plurality of loop lines with the distributed capacitance.

[0019] The insulation device detection module is used for detecting various parameters, sensitivity parameters, insulation parameters and distributed capacitance parameters of the direct current system insulation device, finding a ground fault on site and judging the fault, and positioning the fault on the branch. The fault positioning is to isolate the target branch and the direct current system, judge whether the direct current system ground is isolated, if yes, the ground fault is on the target branch, otherwise, the fault is on other branches.

[0020] The isolation of the target branch and the direct current system comprises: The direct current output voltage of the insulation device is modulated to be lower than the direct current system voltage; The insulation device output end is connected in parallel with the branch switch output end, the direct current system voltage is cut off through the reverse diode, and the direct current output voltage of the insulation device is lower than the direct current system voltage, so that the reverse diode is not conductive; The branch switch is pulled out, the direct current system voltage exits the branch, the insulation device voltage is switched to the branch voltage for power supply, and the branch load is ensured to work.

[0021] The fault site replacement module is used for temporary replacement when the direct current system power supply of the direct current system insulation monitoring device fails. The temporary replacement comprises: The direct current output voltage of the insulation device is modulated to be lower than the direct current system voltage; The positive and negative poles of the insulation device are connected in parallel with the direct current system bus, the insulation device output end is provided with a reverse diode, the direct current system voltage is cut off through the reverse diode, the direct current output voltage of the insulation device is lower than the direct current system voltage, the forward direction is not conductive, and no current is generated; The direct current system power supply is exited, the insulation device power supply is switched to the direct current system bus, and the load current is ensured to be powered.

[0022] In the fault positioning and temporary replacement, the direct current output voltage of the insulation device is modulated, and the direct current output voltage is lower than the direct current system voltage by 0.5V.

[0023] The direct current voltage output range of the insulation device is 1-300V.

[0024] Also includes AC / DC / AC module for parallel 12v battery, AC 220V to DC 12V conversion, AC 220V output after charging the battery, no AC AC conversion. Embodiment 2

[0025] As Figure 3 As shown from the hardware level, the present application provides an embodiment of electronic equipment for all or part of the detection and calibration system for online insulation device of DC system, the electronic equipment includes a service processor and a distributed memory, the service processor is connected with the memory, the distributed memory stores a service self-management program, which is configured to store machine readable instructions, the service processor executes the service self-management program, and the instructions are executed by the processor to realize the detection and calibration system for online insulation device of DC system as described above.

[0026] From the hardware level, in order to effectively improve the flexibility, versatility and acquisition efficiency of data acquisition, the present application provides an embodiment of electronic equipment for all or part of the detection and calibration system for online insulation device of DC system, which specifically includes the following contents: A processor, a memory, a communication interface and a bus; wherein the processor, the memory and the communication interface complete mutual communication through the bus; the communication interface is used to realize information transmission between the core business system of the detection and calibration system for online insulation device of DC system, user terminals and related databases and related devices; the logic controller can be a desktop computer, a tablet computer and a mobile terminal, and the present embodiment is not limited thereto.

[0027] In the present embodiment, the logic controller can be implemented according to the embodiment of the detection and calibration system for online insulation device of DC system, the contents of which are incorporated herein, and the repeated parts will not be described again.

[0028] It can be understood that the user terminal can include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc., wherein the smart wearable device can include smart glasses, a smart watch, a smart bracelet, etc.

[0029] In actual application, part of the detection and calibration system for the on-line insulation device of the direct current system can be executed on the electronic device side as described above, or all operations can be completed in the client device, which can be selected according to the processing capacity of the client device and the limitation of the user's use scene, and the application does not limit this. If all operations are completed in the client device, the client device can further include a processor.

[0030] The client device described above can have a communication module (i.e., a communication unit) and can be in communication connection with a remote server to realize data transmission with the server. The server can include a server on the task scheduling center side, and in other implementation scenarios, can also include a server of an intermediate platform, such as a server of a third-party server platform in communication link with the task scheduling center server. The server can include a single computer device, or a server cluster composed of multiple servers, or a server structure of a distributed device. Embodiment 3

[0031] The embodiments of the application further provide a computer readable storage medium for the detection and calibration system for the on-line insulation device of the direct current system, which can realize the execution subject in the above embodiments as a server or a client. The computer readable storage medium stores a computer program, and the computer program is executed by a processor to realize all contents of the detection and calibration system for the on-line insulation device of the direct current system in the above embodiments as a server or a client.

[0032] The embodiments of the application can be provided as a method, an apparatus, or a computer program product, and thus the application can be in the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects, and the application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0033] The application is described with reference to flowcharts and / or block diagrams according to the embodiments of the application, and it should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions, and these computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device that realizes the functions described in the flowcharts and / or block diagrams. Figure 1 one flow or multiple flows and / or blocks Figure 1means for performing the function specified by the block or blocks.

[0034] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow Figure 1 flow or flows and / or blocks Figure 1 means for performing the function specified by the block or blocks.

[0035] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 flow or flows and / or blocks Figure 1 steps of means for performing the function specified by the block or blocks.

[0036] The above embodiments are only preferred embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the patent of the present application. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications, improvements and substitutions can be made, which all belong to the protection scope of the present application.

Claims

1. A detection and calibration system for on-line insulation of direct current systems, characterized in that, The application relates to a detection and calibration system for an online insulation device of a direct-current system. The calibration module comprises two groups of independent direct-current power supplies, each group of the direct-current power supplies has adjustable 20V-286V output voltage, and the grounding resistance has a resistance range of 0-200K omega. The fault positioning comprises the following steps: isolating a target branch from the direct-current system, judging whether the direct-current system grounding is isolated or not, if yes, the grounding fault is in the target branch, otherwise, the fault is in other branches. The temporary replacement comprises the following steps: modulating the direct-current output voltage of the insulation device to be lower than the direct-current system voltage; connecting the output end of the insulation device and the output end of the branch switch in parallel; cutting off the direct-current system voltage through a reverse diode; not conducting when the direct-current output voltage of the insulation device is lower than the direct-current system voltage; pulling off the branch switch; cutting off the direct-current system voltage from the branch; switching the insulation device voltage to the branch voltage to supply power; and ensuring the branch load to work.

2. A detection and calibration system for on-line insulation of DC systems according to claim 1, characterized in that, The direct-current voltage output range of the insulation device is 1-300V. The application further comprises an AC / DC / AC module which is used for connecting a 12V storage battery in parallel, converting AC 220V into DC 12V, converting AC 220V into AC 220V when there is no AC, and providing AC 220V output.

3. A detection and calibration system for on-line insulation of DC systems according to claim 1, characterized in that, The computer program is executed by the processor to realize the content of the detection and calibration system for the online insulation device of the direct-current system.

4. A detection and calibration system for on-line insulation of DC systems according to claim 3, characterized in that, ​ ​ ​ ​ 5. A detection and calibration system for on-line insulation of DC systems according to claim 4, characterized in that, ​ ​ ​ ​ 6. A detection and calibration system for on-line insulation of DC systems according to claim 5, characterized in that, ​ 7. A detection and calibration system for on-line insulation of DC systems according to claim 1, characterized in that, ​ 8. The detection and calibration system for on-line insulation of DC systems according to claim 1, characterized in that, ​ 9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, ​ 10. A computer-readable storage medium having stored thereon a computer program, characterized in that, ​

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