CN116908644A - Device and method for testing direct current circuit of transformer substation - Google Patents
Device and method for testing direct current circuit of transformer substation Download PDFInfo
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- CN116908644A CN116908644A CN202310686133.8A CN202310686133A CN116908644A CN 116908644 A CN116908644 A CN 116908644A CN 202310686133 A CN202310686133 A CN 202310686133A CN 116908644 A CN116908644 A CN 116908644A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 180
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 37
- 238000009413 insulation Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
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- 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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- General Engineering & Computer Science (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to the technical field of direct current loop detection, and provides a device and a method for testing a direct current circuit of a transformer substation, wherein the testing device comprises a main controller and a plurality of detection units; and the main controller adaptively selects the detection unit with the deviation degree higher than the set early warning level to perform the next detection item based on the degree of deviation from the normal value of the detection result of each detection unit, and controls the corresponding detection unit to be connected into the direct current circuit of the transformer substation. The detection unit for next detection is selected in a self-adaptive manner, the detection unit with the selection deviation degree higher than the set level is used for detection, and the item about to be or possibly having a fault can be predicted before the direct current circuit fails, so that the early prediction and detection of the fault are realized, the detection is targeted, the detection frequency of the detection item of stable operation is reduced, the detection resource waste is reduced, and the running stability and safety of the direct current circuit can be improved.
Description
Technical Field
The disclosure relates to the technical field of direct current loop detection, in particular to a device and a method for testing a direct current circuit of a transformer substation.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The direct current system of the transformer substation provides direct current power for the tripping and closing loop, the signal loop and the accident lighting loop of protection, measurement and control and other automatic devices, communication equipment and circuit breakers in the transformer substation, is a central of the control system of relay protection equipment, measurement and control devices and the like of the transformer substation, and comprises a storage battery pack, a charging machine screen, a power supply screen and the like. The normal operation of the direct current system of the transformer substation is directly related to the normal operation of the total station protection control system and the remote transmission of the measurement and control information in the transformer substation. The direct current bus of the transformer substation loses voltage, which can cause that relay protection equipment, safety automatic devices, communication equipment and the like cannot be normal.
The control of the existing transformer substation direct current system is that either the direct current loop is periodically detected by manually carrying detection equipment, or an integrated direct current loop detection device is adopted, so that unattended automatic detection can be realized, but most automatic detection is carried out according to set detection frequency and item cycle detection, so that the item of detection is also cycle detection, the pertinence is not strong, the detection resource waste is caused, and the detection cost is increased.
Disclosure of Invention
In order to solve the problems, the present disclosure provides a device and a method for testing a direct current circuit of a transformer substation, which integrate multiple detection functions and can adaptively select detection options, thereby realizing efficient detection of the direct current circuit of the transformer substation.
In order to achieve the above purpose, the present disclosure adopts the following technical scheme:
one or more embodiments provide a substation direct current circuit testing device, including a main controller and a plurality of detection units; and the main controller adaptively selects the detection unit with the deviation degree higher than the set early warning level to perform the next detection item based on the degree of deviation from the normal value of the detection result of each detection unit, and controls the corresponding detection unit to be connected into the direct current circuit of the transformer substation.
Compared with the prior art, the beneficial effects of the present disclosure are:
in the method, the detection unit for next detection is selected in a self-adaptive mode, the detection unit with the selection deviation degree higher than the set level is used for detection, the item about to or possibly suffering from the fault can be predicted before the direct current circuit breaks down, so that the early prediction and detection of the fault are realized, the detection is targeted, the detection frequency of the detection item of stable operation is reduced, the waste of detection resources is reduced, and the running stability and safety of the direct current circuit can be improved.
The advantages of the present disclosure, as well as those of additional aspects, will be described in detail in the following detailed description of embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the exemplary embodiments of the disclosure and together with the description serve to explain and do not limit the disclosure.
FIG. 1 is a block diagram of a detection system of embodiment 1 of the present disclosure;
fig. 2 is a schematic diagram of a bridge circuit structure of an insulation resistance detection unit of embodiment 1 of the present disclosure;
fig. 3 is a flowchart of a detection method of embodiment 2 of the present disclosure.
Detailed Description
The disclosure is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof. It should be noted that, without conflict, the various embodiments and features of the embodiments in the present disclosure may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.
Example 1
In the technical scheme disclosed in one or more embodiments, as shown in fig. 1 to 2, a direct current circuit testing device of a transformer substation comprises a main controller and a plurality of detection units;
the detection unit includes, but is not limited to: the device comprises an insulation resistance detection unit, a charger detection module, an alternating current serial unit, a voltage and current detection unit and a silicon chain automatic switching device; the main controller is respectively connected with the insulation resistance detection unit, the charger detection module, the alternating current serial unit and the voltage and current detection unit by a silicon chain automatic switching device;
and the main controller adaptively selects the detection unit with the deviation degree higher than the set early warning level to perform the next detection item based on the degree of deviation from the normal value of the detection result of each detection unit, and controls the corresponding detection unit to be connected into the direct current circuit of the transformer substation.
In this embodiment, the detection unit for performing the next detection is selected adaptively, and the detection unit with the deviation degree higher than the set level is selected for detection, so that the item about to be or possibly having a fault can be predicted before the direct current circuit fails, thereby realizing the advanced prediction and detection of the fault, enabling the detection to have pertinence, reducing the detection frequency of the detection item of stable operation, reducing the detection resource waste, and improving the stability and safety of the operation of the direct current circuit.
Further, the adaptive selection process of the main controller further comprises the following processes: when two or more detection items exceed the set same early warning level, the priority of the detection items is set according to the hazard degree of faults of the corresponding detection items, the detection items exceeding the level are sequentially detected according to the priority, and after detection, the next detection is selected according to the degree that the detection result of each detection unit deviates from the normal value.
In this embodiment, on the basis of adaptively selecting the detection item times of which the detection results deviate, the screened detection item times are ordered according to the priority, so that the detection process is orderly executed, and the detection efficiency is improved.
Further, the adaptive selection process of the main controller further includes the following processes: when the detection result of each detection item is in the normal range, detection is carried out according to the set detection sequence, and the detection result is judged every time the detection is carried out.
In some embodiments, the insulation resistance detection unit adopts a bridge method to measure the insulation resistance of the direct current bus to the ground, and comprises a bridge circuit and a voltage detection circuit, wherein the bridge circuit comprises a plurality of resistors to form a bridge structure, two ends of the bridge circuit are connected with the direct current bus, and an intermediate node is grounded through the resistors. The voltage detection circuit is used for detecting the voltage to ground of the intermediate node.
Optionally, the bridge circuit is connected with the direct current bus through the first electronic switch K1 or the contactor, and the main controller is used for controlling the on-off of the first electronic switch K1 or the contactor.
As shown in fig. 2, the bridge circuit specifically includes a first resistor R1 and a second resistor R2 connected in series, a third resistor R3 and a fourth resistor R4 are connected in series to a connection point of the first resistor R1 and the second resistor R2, a connection point of the third resistor R3 and the fourth resistor R4 is an intermediate node, and the intermediate node is grounded through the fourth resistor R4. The sum of the resistance values of the third resistor R3 and the fourth resistor R4 is far greater than that of the first resistor R1 and the second resistor R2, and the third resistor R3 is far greater than that of the fourth resistor R4, wherein the relation of the multiple of more than ten times can be far greater.
Optionally, the voltage detection circuit may use a dc voltmeter, capable of detecting current and voltage, and may be connected to the main controller through a 485 bus to transmit detected data to the main controller.
The bridge circuit shown in FIG. 2, CL+ is the positive busbar of the DC system, CL-is the negative busbar of the DC system, and is referred to as the ground resistance R-<R+ is U bo Positive value, when R+ becomes smaller, U bo When the value of (C) is smaller than R-, U bo The value of (2) is negative.
Normally, the value of the initial ground resistance is known, i.e. U in normal state bo The values of (2) are unchanged; when the resistance value changes to cause U bo The value of (2) changes. Can detect U under normal operation state bo Setting U bo A plurality of numerical ranges sequentially expanding around a normal value, and a detection voltage value U bo The farther from the normal value, the higher the alert level. U (U) bo Corresponding to a change in ground resistance.
According to one specific example, according to U bo The warning level is set by the numerical variation of the ground resistor, and the warning level comprises a first numerical range, a second numerical range and a third numerical range, wherein the first numerical range is a subset of the second numerical range, the second data range is a subset of the third numerical range, the warning level is highest when the second numerical range exceeds the third numerical range, and the higher the degree of the change of the ground resistor is, the higher the possibility of faults is. The detection result of the insulation resistance detection unit can be provided with three early warning levels, the third early warning level is beyond the first numerical range, the second early warning level is beyond the second numerical range, and the first early warning level is as followsThe scale is outside the third range of values.
In some embodiments, the charger detection module may be configured to detect parameter information such as voltage regulation precision, current regulation precision, voltage regulation and current limiting characteristics, current regulation and voltage limiting characteristics, power factor and efficiency, ripple effective value coefficient and ripple crest coefficient, and may use an existing charger detector.
When the power supply of the direct current circuit is detected to be in a charging state, the main controller can start the charger detector to detect the operation parameters of the charger in the normal charging process.
The method comprises the steps that data detected by a charger detector exceed a set range to judge that the charger is in a charging fault, a direct current system fault cannot be directly caused due to the fact that the charger is in a charging fault, a power supply of the direct current system cannot be charged after the charger is in a fault state, the direct current system fault is caused after the power supply is in a power failure state, therefore, a numerical range is set for an operation parameter value when the charger detector is in a fault state, when the charger detector is in the fault state, namely the detected operation parameter data exceed the set numerical range, a controller directly gives an alarm, and related alarm information is transmitted to an upper computer or terminal equipment of a maintainer. The early warning level of the charger detection module is a first early warning level, namely the charger fails to reach the first early warning level.
The terminal equipment of the maintenance personnel can be mobile equipment, such as a mobile phone, and can also be a computer terminal.
In some embodiments, the ac current serial unit includes an ac signal generating circuit and a protection device action detecting module, where the ac signal generating circuit is sequentially connected with a dc power supply, an inverter, and an ac access interface, and the ac access interface is electrically connected with a dc loop of the transformer substation. The inverter is used for converting the output of the direct current power supply into an alternating current signal and transmitting the alternating current signal to the direct current loop through the alternating current access interface, wherein the main controller controls the starting and stopping of the inverter.
The protection device action detection module is used for acquiring action information of a protection device of a direct current loop of the transformer substation and identifying whether a protection action occurs correctly after alternating current signal is in series.
The early warning level of the alternating current serial unit is set to be a first early warning level, namely, after alternating current serial is carried out, the protection device does not output related protection actions, namely, the protection function of the protection device is invalid, and alternating current serial electric fault information is generated.
In some embodiments, the voltage and current detection unit and the silicon chain automatic switching device are used for realizing detection and control of direct current loop current and voltage;
the voltage and current detection unit comprises a direct current voltage transformer and a direct current transformer, the direct current voltage transformer is used for measuring the bus voltage and the battery voltage, the direct current transformer is used for measuring the bus current and the battery current, the isolation of strong current and weak current is realized, and the automatic switching of the silicon chain is controlled according to the height of the bus voltage so that the bus voltage is in a normal range. If the bus voltage cannot be normal by throwing and cutting off the silicon chain, when the bus voltage is higher than the bus overvoltage setting value, carrying out bus overvoltage fault alarm; and when the voltage is lower than the setting value of the bus under-voltage, the alarm of the bus under-voltage fault is carried out, and the automatic conversion of the working mode of the charger is controlled according to the current of the battery.
The main controller is respectively connected with the voltage and current detection unit and the automatic silicon chain switching device and is used for acquiring the detected bus voltage, battery voltage and bus current and simultaneously acquiring the switching quantity of the automatic silicon chain switching device;
determining voltage early warning levels according to the number of connected silicon chains of the automatic silicon chain switching device, and setting a third early warning level when the number of the silicon chains connected into the direct current loop is larger than a first silicon chain threshold value, a second early warning level when the number of the silicon chains connected into the direct current loop is larger than a second silicon chain threshold value, and a first early warning level when the number of the silicon chains connected into the direct current loop is larger than the third silicon chain threshold value, wherein the number of the silicon chains connected into the direct current loop is larger than the first silicon chain threshold value; the third silicon chain threshold may be to put all silicon chains into use.
According to the embodiment, different early warning grades are set for each detection unit, so that quantitative comparison of data in different dimensions is realized, for example, the early warning grade of the voltage and current detection unit and the silicon chain automatic switching device is a second early warning grade, the early warning grade of the alternating current serial unit is a first early warning grade, other detection units are in a normal range, and the next detection is to control and access the alternating current serial unit. The next detection is carried out by selecting the item with the expected level according to different levels, so that the self-adaptive selection of the detection unit is realized, and the detection efficiency of the system can be improved.
Example 2
Based on embodiment 1, a test method of the substation direct current circuit test device according to embodiment 1 is provided in this embodiment, as shown in fig. 3, and includes the following steps:
step 1, obtaining detection data of each detection unit, and determining early warning grades of each detection item according to detection results;
step 2, adaptively selecting a next detection item according to the level of the early warning level;
and 3, controlling a detection unit corresponding to the next detection item to be connected to the direct current circuit.
Further, when two or more detection items exceed the same set early warning level, setting the priority of the detection items according to the hazard degree of faults of the corresponding detection items, sequentially detecting the detection items exceeding the level according to the priority, and selecting to detect the next detection item according to the degree of deviation of the detection result of each detection unit from a normal value after the detection is finished;
or/and, when the detection result of each detection item is in the normal range, detecting according to the set detection sequence, and judging the detection result every time.
The foregoing description of the preferred embodiments of the present disclosure is provided only and not intended to limit the disclosure so that various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
While the specific embodiments of the present disclosure have been described above with reference to the drawings, it should be understood that the present disclosure is not limited to the embodiments, and that various modifications and changes can be made by one skilled in the art without inventive effort on the basis of the technical solutions of the present disclosure while remaining within the scope of the present disclosure.
Claims (10)
1. A direct current circuit testing arrangement of transformer substation, its characterized in that: comprises a main controller and a plurality of detection units; and the main controller adaptively selects the detection unit with the deviation degree higher than the set early warning level to perform the next detection item based on the degree of deviation from the normal value of the detection result of each detection unit, and controls the corresponding detection unit to be connected into the direct current circuit of the transformer substation.
2. The substation direct current circuit testing device according to claim 1, wherein the adaptive selection process of the main controller further comprises: when two or more detection items exceed the set same early warning level, the priority of the detection items is set according to the hazard degree of faults of the corresponding detection items, the detection items exceeding the level are sequentially detected according to the priority, and after detection, the next detection is selected according to the degree that the detection result of each detection unit deviates from the normal value.
3. The direct current circuit testing device of a transformer substation according to claim 1, wherein the adaptive selection process of the main controller further comprises the following process: when the detection result of each detection item is in the normal range, detection is carried out according to the set detection sequence, and the detection result is judged every time the detection is carried out.
4. The direct current circuit testing device of a transformer substation according to claim 1, wherein the detecting unit comprises an insulation resistance detecting unit, a charger detecting module, an alternating current serial unit, a voltage and current detecting unit and a silicon chain automatic switching device; the main controller is respectively connected with the insulation resistance detection unit, the charger detection module, the alternating current serial unit and the voltage and current detection unit by a silicon chain automatic switching device.
5. The device for testing the direct current circuit of the transformer substation according to claim 4, wherein the insulation resistance detection unit is used for measuring the insulation resistance of the direct current bus to the ground by adopting a bridge method, and comprises a bridge circuit and a voltage detection circuit, wherein the bridge circuit comprises a plurality of resistors to form a bridge structure, two ends of the bridge circuit are connected with the direct current bus, the middle node is grounded through the resistors, and the voltage detection circuit is used for detecting the voltage to the ground of the middle node; the method comprises the steps of setting early warning grades according to the numerical change of the grounding voltage of an intermediate node, wherein the early warning grades comprise a first numerical range, a second numerical range and a third numerical range, the first numerical range is a subset of the second numerical range, the second numerical range is a subset of the third numerical range, the warning grades are highest when the third numerical range is exceeded, the detection result of an insulation resistance detection unit is provided with three early warning grades, the third early warning grades exceed the first numerical range, the second early warning grades exceed the second numerical range, and the first early warning grades exceed the third numerical range.
6. The substation direct current circuit testing device according to claim 4, wherein: when the power supply of the direct current circuit is detected to be in a charging state, the main controller starts a charger detector to detect the operation parameters of the charger in the normal charging process;
the early warning level of the charger detection module is a first early warning level, and the charger fails to reach the first early warning level.
7. The direct current circuit testing device of a transformer substation according to claim 4, wherein the alternating current serial unit comprises an alternating current signal generating circuit, a protective device action detecting module, a direct current power supply, an inverter and an alternating current access interface which are sequentially connected with the alternating current signal generating circuit, wherein the alternating current access interface is electrically connected with a direct current loop of the transformer substation; the main controller controls the start and stop of the inverter;
the protection device action detection module is used for acquiring action information of a protection device of a direct current loop of the transformer substation and identifying whether a protection action occurs correctly after the alternating current signal is in series connection;
the early warning level of the alternating current serial unit is set to be a first early warning level, namely, after alternating current serial is carried out, the protection device does not output related protection actions, and alternating current serial electric is generated to serve as fault information.
8. The direct current circuit testing device of a transformer substation according to claim 4, wherein the voltage and current detection unit and the silicon chain automatic switching device are used for detecting and controlling the current and the voltage of the direct current loop; the main controller is respectively connected with the voltage and current detection unit and the automatic silicon chain switching device and is used for acquiring the detected bus voltage, battery voltage and bus current and simultaneously acquiring the switching quantity of the automatic silicon chain switching device;
and determining a voltage early warning level according to the number of the connected silicon chains of the automatic silicon chain switching device, and setting a third early warning level when the number of the silicon chains connected into the direct current loop is larger than a first silicon chain threshold value, a second early warning level when the number of the silicon chains connected into the direct current loop is larger than a second silicon chain threshold value, and a first early warning level when the number of the silicon chains connected into the direct current loop is larger than the third silicon chain threshold value, wherein the number of the silicon chains connected into the direct current loop is larger than the second silicon chain threshold value and the number of the silicon chains connected into the direct current loop is larger than the third silicon chain threshold value.
9. A testing method based on a testing device for a direct current circuit of a transformer substation according to any one of claims 1 to 8, characterized by comprising the steps of:
acquiring detection data of each detection unit, and determining early warning grades of each detection item according to detection results;
adaptively selecting a next detection item according to the level of the early warning level;
and controlling the detection unit corresponding to the next detection item to be connected to the direct current circuit.
10. The test method according to claim 9, wherein when two or more detection items are out of a set same pre-warning level, the priority of the detection items is set according to the hazard degree of the corresponding detection items being out of order, the detection items out of level are sequentially detected according to the priority, and after the detection, the next detection is selected according to the degree of deviation of the detection result of each detection unit from a normal value;
or/and, when the detection result of each detection item is in the normal range, detecting according to the set detection sequence, and judging the detection result every time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310686133.8A CN116908644A (en) | 2023-06-09 | 2023-06-09 | Device and method for testing direct current circuit of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310686133.8A CN116908644A (en) | 2023-06-09 | 2023-06-09 | Device and method for testing direct current circuit of transformer substation |
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