CN208270709U - A kind of intelligent substation integrated power supply Insulation Inspection System - Google Patents
A kind of intelligent substation integrated power supply Insulation Inspection System Download PDFInfo
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- CN208270709U CN208270709U CN201821044884.0U CN201821044884U CN208270709U CN 208270709 U CN208270709 U CN 208270709U CN 201821044884 U CN201821044884 U CN 201821044884U CN 208270709 U CN208270709 U CN 208270709U
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- 238000009413 insulation Methods 0.000 title claims abstract description 36
- 238000007689 inspection Methods 0.000 title claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000004458 analytical method Methods 0.000 claims description 3
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- 238000000034 method Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 2
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Abstract
The utility model provides a kind of intelligent substation integrated power supply Insulation Inspection System, and the Insulation Inspection System includes signal acquisition unit, signal processing unit, A/D converting unit, central control unit, relay, storage unit, display unit, alarm unit, communication unit and key-press input unit；Signal acquisition unit handles the signal input signal processing unit of acquisition, A/D converting unit is inputted again to carry out A/D conversion and input central control unit, central control unit is compared judgement with preset reference value to the signal of input, detect the integrated power supply insulation status, and storage is carried out by storage unit and display unit and is shown, if there is insulation fault, classification alarm is carried out by alarm unit.The utility model provides a kind of intelligent substation integrated power supply Insulation Inspection System, provides effective guarantee for the normal operation of direct current system safety.
Description
Technical field
The utility model belongs to technical field of electric power detection, in particular to a kind of intelligent substation integrated power supply insulation inspection
Examining system.
Background technique
With the continuous development of power technology, intelligent substation is commonplace, compared to more traditional direct current supply system
System is powered using integrated power source apparatus now: DC power supply, electric power inverter, leads to electric power ac uninterrupted power supply
The devices such as credit DC transformating power are combined into one, and share the battery group of DC power supply, and are uniformly monitored complete
Equipment.
Insulation monitoring is one of most important guarantee in integrated power supply management, and a perfect power-supply management system is not from
Open good Insulation monitoring function.Insulation fault once occurs for integrated power supply, and it is straight that problem often occurs from its main part
It flows in power-supply system.When monopole ground connection occurs for direct current system, it cannot be formed into a loop, because without generating short circuit current.But such as
Fruit is not handled in time, when two points ground fault or multipoint earthing occurs in system, it is possible to ground short circuit failure is constituted, from
And cause protective relaying device, automation equipment and device for signalling that malfunction tripping occurs, DC insurance fusing is even resulted in,
Direct current system decompression.Therefore it provides a set of effective integrated power supply Insulation Inspection System is the normal fortune of direct current system safety
Row provides effective ensure.
Utility model content
The utility model provides a kind of intelligent substation integrated power supply Insulation Inspection System, is that direct current system is normal safely
Operation effective ensure is provided.
The utility model is specially a kind of intelligent substation integrated power supply Insulation Inspection System, the Insulation Inspection System
It is single including signal acquisition unit, signal processing unit, A/D converting unit, central control unit, relay, storage unit, display
Member, alarm unit, communication unit and key-press input unit, the signal acquisition unit, the signal processing unit, the A/D
Converting unit and the central control unit are linked in sequence, the central control unit respectively with the signal acquisition unit, institute
State signal processing unit, the relay, the storage unit, the display unit, the alarm unit, the communication unit
It is connected with the key-press input unit, the relay is also connected with the signal acquisition unit；The signal acquisition list
The signal of acquisition is inputted the signal processing unit and is filtered enhanced processing by member, then is inputted the A/D converting unit and carried out
A/D converts and inputs the central control unit, signal and preset reference value of the central control unit to input
It is compared judgement, detects the integrated power supply insulation status, and carry out by the storage unit and the display unit
Storage display, if there is insulation fault, carries out classification alarm by the alarm unit.
The signal acquisition unit acquisition DC bus positive and negative electrode voltage-to-ground and branch leakage current, the DC bus
Positive and negative electrode voltage-to-ground is measured using partial pressure method, and the DC bus positive and negative electrode is directly accessed voltage with conducting wire and accesses circuit
Interior, the voltage access circuit is by balance resistance bridge joint ground, and the central control unit is by controlling closing for the relay
It closes and disconnects, and then control the state that ground resistance accesses tested branch；The branch leakage current is sensed using DC leakage current
Device acquires the out-of-balance current of branch road, and the branch positive and negative electrode cable is all passed through from the DC leakage current center sensor,
Electrical link does not occur；The branch number be more than or equal to 1, the DC leakage current number of probes also greater than be equal to 1, and with
The branch number is equal.
The signal processing unit includes difference amplifier, low-pass filter, and input signal is amplified and filtered respectively
Wave processing.
The display unit uses liquid crystal display, in conjunction with the storage unit, the key-press input unit to the intelligence
It can substation's integrated power supply progress parameter setting；The display unit can real-time display DC bus positive and negative electrode it is electric over the ground
Pressure value, branch leakage current value and failure report.
The relay includes the first relay and the second relay, and first relay is alternate with DC bus anode
It connects, second relay and DC bus cathode are mutually indirect, and the central control unit carries out circulation behaviour to the relay
Make, share three steps:
Step 1 is closed first relay, is closed second relay；
Step 2 is closed first relay, disconnects second relay；
Step 3 disconnects first relay, is closed second relay；
It is separated by 10 power frequency periods between each step.
The central control unit controls the signal acquisition unit according to preset relevant parameter, at the signal
The acquisition process work for managing unit, relay progress signal, according to the DC bus positive and negative electrode voltage-to-ground of acquisition
Value and the branch leakage current value judge whether that ground fault and fault type occurs:
If the branch leakage current value is not zero, the DC bus positive and negative electrode voltage-to-ground value is reduced, then the intelligence
Monopolar grounding fault occurs for substation's integrated power supply；
If the branch leakage current value is zero, the DC bus positive and negative electrode voltage-to-ground value is constant, respectively according to
It is adopted when first relay closure, second relay disconnect and first relay disconnects, second relay is closed
The DC bus positive and negative electrode voltage-to-ground value of collection calculates the two poles of the earth insulation against ground resistance value using Kirchhoff's law, into
And judge whether that two pole ground faults occur；
The central control unit carries out Difference Calculation to the DC bus positive and negative electrode voltage-to-ground value of acquisition, sentences
Break whether to occur to exchange and scurry into DC Line Fault,The UACHave to scurry into the alternating current of direct current system
Valid value, the A are correction coefficient, the u1...unFor collected voltage in each period, the n is adopting in signal period
Number of samples.
The communication unit uses MODBUS communications protocol to be communicated with master-slave mode, the Insulation Inspection System conduct
The command response that slave is sent according to host computer, and will test data and the analysis result upload host computer.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of intelligent substation integrated power supply Insulation Inspection System of the utility model.
Specific embodiment
With reference to the accompanying drawing to a kind of specific reality of intelligent substation integrated power supply Insulation Inspection System of the utility model
The mode of applying elaborates.
As shown in Figure 1, the Insulation Inspection System of the utility model includes signal acquisition unit, signal processing unit, A/D turns
Unit, central control unit, relay, storage unit, display unit, alarm unit, communication unit and key-press input unit are changed,
The signal acquisition unit, the signal processing unit, the A/D converting unit and the central control unit are linked in sequence,
The central control unit is single with the signal acquisition unit, the signal processing unit, the relay, the storage respectively
First, the described display unit, the alarm unit, the communication unit are connected with the key-press input unit, the relay
Also it is connected with the signal acquisition unit；The signal acquisition unit by the signal of acquisition input the signal processing unit into
Row filter amplifying processing, then input the A/D converting unit and carry out A/D conversion and input the central control unit, it is described in
Centre control unit is compared judgement with preset reference value to the signal of input, detects the integrated power supply insulation shape
Condition, and storage is carried out by the storage unit and the display unit and is shown, it is single by the alarm if there is insulation fault
Member carries out classification alarm.
The signal acquisition unit acquisition DC bus positive and negative electrode voltage-to-ground and branch leakage current, the DC bus
Positive and negative electrode voltage-to-ground is measured using partial pressure method, and the DC bus positive and negative electrode is directly accessed voltage with conducting wire and accesses circuit
Interior, the voltage access circuit is by balance resistance bridge joint ground, and the central control unit is by controlling closing for the relay
It closes and disconnects, and then control the state that ground resistance accesses tested branch；The branch leakage current is sensed using DC leakage current
Device acquires the out-of-balance current of branch road, and the branch positive and negative electrode cable is all passed through from the DC leakage current center sensor,
Electrical link does not occur；The branch number be more than or equal to 1, the DC leakage current number of probes also greater than be equal to 1, and with
The branch number is equal.
The signal processing unit includes difference amplifier, low-pass filter, and input signal is amplified and filtered respectively
Wave processing.
The display unit uses liquid crystal display, in conjunction with the storage unit, the key-press input unit to the intelligence
It can substation's integrated power supply progress parameter setting；The display unit can real-time display DC bus positive and negative electrode it is electric over the ground
Pressure value, branch leakage current value and failure report.
The relay includes the first relay and the second relay, and first relay is alternate with DC bus anode
It connects, second relay and DC bus cathode are mutually indirect, and the central control unit carries out circulation behaviour to the relay
Make, share three steps:
Step 1 is closed first relay, is closed second relay；
Step 2 is closed first relay, disconnects second relay；
Step 3 disconnects first relay, is closed second relay；
It is separated by 10 power frequency periods between each step.
The central control unit controls the signal acquisition unit according to preset relevant parameter, at the signal
The acquisition process work for managing unit, relay progress signal, according to the DC bus positive and negative electrode voltage-to-ground of acquisition
Value and the branch leakage current value judge whether that ground fault and fault type occurs:
If the branch leakage current value is not zero, the DC bus positive and negative electrode voltage-to-ground value is reduced, then the intelligence
Monopolar grounding fault occurs for substation's integrated power supply；
If the branch leakage current value is zero, the DC bus positive and negative electrode voltage-to-ground value is constant, respectively according to
It is adopted when first relay closure, second relay disconnect and first relay disconnects, second relay is closed
The DC bus positive and negative electrode voltage-to-ground value of collection calculates the two poles of the earth insulation against ground resistance value using Kirchhoff's law, into
And judge whether that two pole ground faults occur；
The central control unit carries out Difference Calculation to the DC bus positive and negative electrode voltage-to-ground value of acquisition, sentences
Break whether to occur to exchange and scurry into DC Line Fault,The UACHave to scurry into the alternating current of direct current system
Valid value, the A are correction coefficient, the u1...unFor collected voltage in each period, the n is adopting in signal period
Number of samples.
The communication unit uses MODBUS communications protocol to be communicated with master-slave mode, the Insulation Inspection System conduct
The command response that slave is sent according to host computer, and will test data and the analysis result upload host computer.
Finally it should be noted that only illustrating the technical solution of the utility model in conjunction with above-described embodiment rather than limiting it
System.Those of ordinary skills in the art should understand that arriving, those skilled in the art can be to the specific implementation of the utility model
Mode is modified or replaced equivalently, but these modifications or change are being applied among pending claims.
Claims (6)
1. a kind of intelligent substation integrated power supply Insulation Inspection System, which is characterized in that the Insulation Inspection System includes letter
Number acquisition unit, signal processing unit, A/D converting unit, central control unit, relay, storage unit, display unit, report
Alert unit, communication unit and key-press input unit, the signal acquisition unit, the signal processing unit, A/D conversion are single
First and described central control unit is linked in sequence, the central control unit respectively with the signal acquisition unit, the signal
Processing unit, the relay, the storage unit, the display unit, the alarm unit, the communication unit and described
Key-press input unit is connected, and the relay is also connected with the signal acquisition unit；The signal acquisition unit will adopt
The signal of collection inputs the signal processing unit and is filtered enhanced processing, then inputs the A/D converting unit and carry out A/D conversion
And the central control unit is inputted, the central control unit is compared the signal of input with preset reference value
Judgement, detects the integrated power supply insulation status, and carry out storage by the storage unit and the display unit and show,
If there is insulation fault, classification alarm is carried out by the alarm unit.
2. a kind of intelligent substation integrated power supply Insulation Inspection System according to claim 1, which is characterized in that described
Signal acquisition unit acquires DC bus positive and negative electrode voltage-to-ground and branch leakage current, the DC bus positive and negative electrode conducting wire
It is directly accessed in voltage access circuit, for the voltage access circuit by balance resistance bridge joint ground, the central control unit is logical
The open and close for controlling the relay is crossed, and then controls the state that ground resistance accesses tested branch；The branch electric leakage
Stream is using the out-of-balance current of DC leakage flow sensor acquisition branch road, and the branch positive and negative electrode cable is all from the direct current
Leakage current sensor center passes through, and electrical link does not occur；The branch number is more than or equal to 1, the DC leakage current sensing
Device number is and equal with the branch number also greater than being equal to 1.
3. a kind of intelligent substation integrated power supply Insulation Inspection System according to claim 1, which is characterized in that described
Signal processing unit includes difference amplifier, low-pass filter, and input signal is amplified and is filtered respectively.
4. a kind of intelligent substation integrated power supply Insulation Inspection System according to claim 1, which is characterized in that described
Display unit uses liquid crystal display, in conjunction with the storage unit, the key-press input unit to the intelligent substation one
Change power supply and carries out parameter setting；The display unit being capable of real-time display DC bus positive and negative electrode voltage-to-ground value, branch electric leakage
Flow valuve and failure report.
5. a kind of intelligent substation integrated power supply Insulation Inspection System according to claim 1 or 2, which is characterized in that
The relay includes the first relay and the second relay, and first relay and DC bus anode are mutually indirect, described
Second relay and DC bus cathode are mutually indirect, and the central control unit carries out circulate operation to the relay.
6. a kind of intelligent substation integrated power supply Insulation Inspection System according to claim 1, which is characterized in that described
Communication unit uses MODBUS communications protocol to be communicated with master-slave mode, and the Insulation Inspection System is as slave according to upper
The command response that machine is sent, and will test data and the analysis result upload host computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821044884.0U CN208270709U (en) | 2018-07-03 | 2018-07-03 | A kind of intelligent substation integrated power supply Insulation Inspection System |
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| CN201821044884.0U CN208270709U (en) | 2018-07-03 | 2018-07-03 | A kind of intelligent substation integrated power supply Insulation Inspection System |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375117A (en) * | 2018-07-31 | 2019-02-22 | 国网江苏省电力有限公司徐州供电分公司 | A kind of intelligent substation integrated power supply Insulation Inspection System based on bridge method and DC leakage current method |
| CN110596519A (en) * | 2019-10-18 | 2019-12-20 | 国网江苏省电力有限公司盐城供电分公司 | Direct current system ground fault detection system based on Fourier transform and detection method thereof |
| CN113075457A (en) * | 2021-03-26 | 2021-07-06 | 阳光电源股份有限公司 | Vehicle-mounted charger and alternating current side insulation detection circuit and method thereof |
-
2018
- 2018-07-03 CN CN201821044884.0U patent/CN208270709U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375117A (en) * | 2018-07-31 | 2019-02-22 | 国网江苏省电力有限公司徐州供电分公司 | A kind of intelligent substation integrated power supply Insulation Inspection System based on bridge method and DC leakage current method |
| CN110596519A (en) * | 2019-10-18 | 2019-12-20 | 国网江苏省电力有限公司盐城供电分公司 | Direct current system ground fault detection system based on Fourier transform and detection method thereof |
| CN113075457A (en) * | 2021-03-26 | 2021-07-06 | 阳光电源股份有限公司 | Vehicle-mounted charger and alternating current side insulation detection circuit and method thereof |
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