CN117269834A - General insulating monitoring devices of transformer substation - Google Patents
General insulating monitoring devices of transformer substation Download PDFInfo
- Publication number
- CN117269834A CN117269834A CN202311237500.2A CN202311237500A CN117269834A CN 117269834 A CN117269834 A CN 117269834A CN 202311237500 A CN202311237500 A CN 202311237500A CN 117269834 A CN117269834 A CN 117269834A
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- direct current
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- transformer substation
- voltage
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 27
- 238000009413 insulation Methods 0.000 claims abstract description 44
- 238000007689 inspection Methods 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application relates to a general insulation monitoring device of a transformer substation, which comprises a host, wherein the host is provided with a first direct Current (CT) interface, a second direct Current (CT) interface and a direct current bus interface; the first direct current CT interface and the second direct current CT interface are both used for being connected with a CT acquisition module or a digital direct current CT, and the CT acquisition module is connected with an analog direct current CT; the direct current bus interface is used for connecting positive and negative direct current buses, the host detects the grounding voltage of the positive and negative direct current buses through the direct current bus interface, the insulation resistance to the ground of the positive and negative buses is calculated according to the grounding voltage, and when the grounding voltage or the insulation resistance to the ground is lower than a set alarm value, the branch inspection function is automatically started.
Description
Technical Field
The application relates to the technical field of general insulating monitoring devices of substations, in particular to a general insulating monitoring device of a substation.
Background
The direct current system mainly provides power for equipment such as a protection device, an automatic device, a monitoring system, a control loop, a signal loop, accident lighting and the like in a transformer substation; whether the direct current system is reliable or not relates to the safe and stable operation of the transformer substation; because the direct current system has a plurality of load loops and wide distribution range, the direct current system is easy to generate grounding faults; the direct current insulation monitoring device monitors the insulation states of the direct current bus and the direct current branch in real time in the direct current system, can send an alarm signal when the direct current system is grounded, and can find out a specific grounding branch; the direct current system is grounded, so that the relay protection device can malfunction and refuse to operate, and the safe and stable operation of the power system is seriously endangered; the insulation to ground of the dc system must be monitored online in real time.
The equipment needs to be replaced in time when the insulation monitoring device fails, and the following problems are sometimes faced: the original manufacturer does not exist or the same equipment stops producing, and other manufacturer equipment cannot be replaced.
Disclosure of Invention
An object of the present application is to provide a general insulation monitoring device for a transformer substation, so as to solve the above-mentioned problems.
In order to achieve the above purpose, an embodiment of the present application provides a general insulation monitoring device for a transformer substation, including a host, where the host is provided with a first dc CT interface, a second dc CT interface, and a dc bus interface; the first direct current CT interface and the second direct current CT interface are both used for being connected with a CT acquisition module or a digital direct current CT, and the CT acquisition module is connected with an analog direct current CT; the direct current bus interface is used for connecting positive and negative direct current buses, the host detects the grounding voltage of the positive and negative direct current buses through the direct current bus interface, the insulation resistance to the ground of the positive and negative buses is calculated according to the grounding voltage, and when the grounding voltage or the insulation resistance to the ground is lower than a set alarm value, the branch inspection function is automatically started.
Further, by acquiring communication protocols of different manufacturers and compiling corresponding programs according to the communication protocols, the programs are loaded to the host, so that the host and the digital direct current CT are communicated, and data acquired by the digital direct current CT are read.
Further, the analog dc CT is a voltage output dc CT or a current output dc CT.
Further, the CT acquisition module adopts ultra-high precision AD sampling, the resolution reaches 24 bits, and the sampling speed is 7200 times per second.
Further, the CT acquisition module is powered by a direct current system power supply, the voltage input range is 80-300 VDC, and a +/-12V power supply required by an output transformer is provided.
Furthermore, the CT acquisition module is provided with 24 paths of analog quantity input, the maximum input voltage of the supported analog quantity is +/-10V, voltage signals are input, then are subjected to voltage division and filtering adjustment and then are sent to ADC (analog to digital converter) sampling, and sampling values are output to the host through the first direct current CT interface or the second direct current CT interface.
The embodiment of the application provides a general insulating monitoring device of transformer substation, has following advantage:
(1) The device is universal, can adapt to substations of different factories and types, has universality and does not need to be customized for different equipment;
(2) The device is provided with a first direct current CT interface, a second direct current CT interface and a direct current bus interface, can be connected with various types of CTs and meets different requirements;
(3) The digital communication can be realized by compiling communication protocols of different manufacturers, and the communication with the digital direct current CT can be realized, and related data can be read, so that the accuracy and the speed of the communication are improved;
based on the above advantage, when equipment needs to be replaced in time when the insulation monitoring device fails, the insulation monitoring device of the embodiment of the application can be used for replacement, and because the insulation monitoring device of the embodiment of the application can be suitable for different direct current CTs, the problems that original manufacturers do not exist or same equipment stops production and other manufacturer equipment cannot replace are solved.
Details and advantages not detailed in the examples of the present application are set forth in the detailed description.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a general insulation monitoring device for a transformer substation in an embodiment of the present application.
Fig. 2 is a schematic diagram of connection between an analog dc CT and a CT sampling module and a host in an embodiment of the present application.
Detailed Description
The detailed description of the drawings is intended as an illustration of the current embodiment of the present application and is not intended to represent the only form in which the present application may be practiced. It is to be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the application.
Referring to fig. 1, an embodiment of the present application provides a general insulation monitoring device for a transformer substation, including a host, where the host is provided with a first dc CT interface, a second dc CT interface, and a dc bus interface; the first direct current CT interface and the second direct current CT interface are both used for being connected with a CT acquisition module or a digital direct current CT, and the CT acquisition module is connected with an analog direct current CT; the direct current bus interface is used for connecting positive and negative direct current buses, the host detects the grounding voltage of the positive and negative direct current buses through the direct current bus interface, the insulation resistance to the ground of the positive and negative buses is calculated according to the grounding voltage, and when the grounding voltage or the insulation resistance to the ground is lower than a set alarm value, the branch inspection function is automatically started.
Specifically, when the branch inspection function is started, the branch inspection generally requires the following steps: the system starting step: when the insulation monitor alarms, the system can automatically start a branch inspection function; branch selection: selecting a branch needing to be inspected according to the design of the system; the host can select or carry out inspection one by one according to a preset sequence; and an insulation resistance testing step: performing insulation resistance test on the selected branch; the insulation resistance to ground can be measured by dc CT (how the insulation resistance to ground needs to be measured by dc CT to be extended); and (3) data recording and analyzing: recording the obtained data, and analyzing and comparing the obtained data; comparing the fault detection value with a preset alarm value to judge whether the branch circuit has an insulation fault or not; fault locating and repairing steps: if an insulation fault exists in a certain branch, fault positioning is needed and corresponding repairing measures are adopted; other devices or methods can be used to pinpoint the failure point and perform repair work; and (3) finishing inspection and feeding back: after the inspection of all the branches is completed, the results are required to be fed back to related personnel in time, and the whole inspection process and the results are recorded.
Further, by acquiring communication protocols of different manufacturers and compiling corresponding programs according to the communication protocols, loading the programs to the host, so as to realize the communication between the host and the digital direct current CT and read data acquired by the digital direct current CT;
specifically, the digital direct current CT and the host adopt digital signal transmission, so that the connecting line of the direct current CT and the host is greatly reduced, the use is convenient, the detection is accurate, the anti-interference capability is strong, the influence of residual magnetism after large current impact can be eliminated, and the long-term stability of CT operation is ensured; the branch leakage current detection of the digital direct current CT adopts direct current active CT, and signals do not need to be injected into a bus; the leakage current detection of all branches is carried out simultaneously, detected signals are directly sent to the monitor host after being collected by the CTs, each CT contains a CPU, the CPU is directly converted into digital signals in each CT, and the digital signals are uploaded to the insulation monitor host through the serial port by the CPU. The direct current insulation monitor can select the type of the connected CT, and corresponding programs are compiled by acquiring the communication protocols of digital direct current CTs of different manufacturers, so that the insulation monitor host and the digital direct current CT are communicated, and the data acquired by the digital direct current CT are read; each CT has an own running program, each digital direct current CT has an own ID, the ID numbers on the CT need to be respectively input into the insulation monitor host machine with the corresponding branch numbers, otherwise, the digital direct current CT cannot normally communicate.
Further, the analog dc CT is a voltage output dc CT or a current output dc CT.
Further, the CT acquisition module adopts ultra-high precision AD sampling, the resolution reaches 24 bits, and the sampling speed is 7200 times per second.
Further, the CT acquisition module is powered by a direct current system power supply, the voltage input range is 80-300 VDC, and a +/-12V power supply required by an output transformer is provided.
Furthermore, the CT acquisition module is provided with 24 paths of analog quantity input, the maximum input voltage of the supported analog quantity is +/-10V, voltage signals are input, then are subjected to voltage division and filtering adjustment and then are sent to ADC (analog to digital converter) sampling, and sampling values are output to the host through the first direct current CT interface or the second direct current CT interface.
Specifically, the general insulation monitoring device for a transformer substation of this embodiment has the following advantages:
substation versatility: the device adopts general design, can adapt to the transformer substation of different producer and types, does not need to customize different equipment. This reduces the burden on engineering and maintenance teams and improves the applicability and flexibility of the device.
Multi-interface support: the device is provided with a first direct current CT interface, a second direct current CT interface and a direct current bus interface, and can be connected with various types of CTs. The device can be connected with the analog direct current CT, and can also realize communication with the digital direct current CT and read related data. This design makes the device can satisfy the demand of different substations, for example, can connect current output type CT in order to monitor the current value, also can connect voltage output type CT in order to monitor the voltage value.
Digital communication: by acquiring communication protocols of different manufacturers and programming corresponding programs, the device can communicate with the digital direct current CT and read the acquired data. The digital communication mode not only improves the accuracy and speed of communication, but also ensures that the processing and analysis of data are more convenient and efficient.
High-precision sampling: the device adopts an ultra-high precision AD sampling technology, the resolution reaches 24 bits, and the sampling speed is 7200 times per second. This ensures accurate measurement and monitoring of the insulation resistance value by the device, so that an insulation fault can be found and early warned in time.
Multifunctional characteristics: besides monitoring and calculating the voltage and insulation resistance of the direct current bus, the device also supports 24 paths of analog quantity input, and can process and monitor other related parameters such as temperature, humidity and the like. The multifunctional characteristic enables the device to be more comprehensive and practical in comprehensive monitoring and fault detection.
In summary, the general insulating monitoring device for the transformer substation in the embodiment of the application has the advantages of universality, multi-interface support, digital communication, high-precision sampling, multifunctional characteristics and the like, and the characteristics enable the device to have wide applicability in the insulating monitoring field of the transformer substation and advantages exceeding the traditional insulating monitoring device, so that requirements of different transformer substations can be met, and the safety reliability and the operation efficiency of equipment are improved. When equipment needs to be replaced in time when the insulation monitoring device fails, the insulation monitoring device can be used for replacement, and because the insulation monitoring device of the embodiment of the application can be suitable for different direct-current CTs, the problems that original manufacturers do not exist or the same equipment stops production and other manufacturer equipment cannot replace are solved.
The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (6)
1. The universal insulation monitoring device for the transformer substation is characterized by comprising a host, wherein the host is provided with a first direct Current (CT) interface, a second direct Current (CT) interface and a direct current bus interface; the first direct current CT interface and the second direct current CT interface are both used for being connected with a CT acquisition module or a digital direct current CT, and the CT acquisition module is connected with an analog direct current CT; the direct current bus interface is used for connecting positive and negative direct current buses, the host detects the grounding voltage of the positive and negative direct current buses through the direct current bus interface, the insulation resistance to the ground of the positive and negative buses is calculated according to the grounding voltage, and when the grounding voltage or the insulation resistance to the ground is lower than a set alarm value, the branch inspection function is automatically started.
2. The universal insulation monitoring device for the transformer substation according to claim 1, wherein the communication between the host and the digital direct current CT is realized and the data acquired by the digital direct current CT is read by acquiring communication protocols of different manufacturers and compiling corresponding programs according to the communication protocols and loading the programs to the host.
3. The universal insulation monitoring device for a transformer substation according to claim 1, wherein the analog dc CT is a voltage output dc CT or a current output dc CT.
4. The universal insulation monitoring device for a transformer substation according to claim 3, wherein the CT acquisition module adopts ultra-high precision AD sampling, the resolution reaches 24 bits, and the sampling speed is 7200 times per second.
5. The universal insulation monitoring device for a transformer substation according to claim 4, wherein the CT acquisition module is powered by a direct current system power supply, the voltage input range is 80-300 VDC, and a +/-12V power supply required by an output transformer is provided.
6. The universal insulation monitoring device for the transformer substation according to claim 5, wherein the CT acquisition module is provided with 24 paths of analog quantity input, the maximum input voltage of the supported analog quantity is +/-10V, voltage signals are input, then are subjected to voltage division and filtering adjustment and then are sent to ADC for sampling, and sampling values are output to the host through the first direct current CT interface or the second direct current CT interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311237500.2A CN117269834A (en) | 2023-09-25 | 2023-09-25 | General insulating monitoring devices of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311237500.2A CN117269834A (en) | 2023-09-25 | 2023-09-25 | General insulating monitoring devices of transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117269834A true CN117269834A (en) | 2023-12-22 |
Family
ID=89219177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311237500.2A Pending CN117269834A (en) | 2023-09-25 | 2023-09-25 | General insulating monitoring devices of transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117269834A (en) |
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2023
- 2023-09-25 CN CN202311237500.2A patent/CN117269834A/en active Pending
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