CN107317305A - Suppress the method and device of transformer DC magnetic bias current based on graded resistance - Google Patents
Suppress the method and device of transformer DC magnetic bias current based on graded resistance Download PDFInfo
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- CN107317305A CN107317305A CN201710432720.9A CN201710432720A CN107317305A CN 107317305 A CN107317305 A CN 107317305A CN 201710432720 A CN201710432720 A CN 201710432720A CN 107317305 A CN107317305 A CN 107317305A
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- resistance
- switch
- current
- transformer
- logic controller
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Transformers (AREA)
Abstract
The invention provides a kind of method and device for suppressing transformer bias electric current based on graded resistance, described device includes：Programmable logic controller PLC, suppresses resistance R1 and R2, switchs Kg1 and Kg2, AC current transformer Ta1 and DC current sensor Ta2, and graphene discharging gap K；The programmable logic controller PLC controls the break-make of the switch Kg1 and Kg2, and the switch Kg1 controls suppress being switched in or out for resistance R1；The switch Kg2 controls suppress being switched in or out for resistance R2；The DC current sensor Ta2 implements to switch Kg1 break-make by programmable logic controller PLC, and the AC current transformer Ta1 is used for the out-of-balance current for detecting transformer neutral point, and passes to programmable logic controller PLC records；The graphene discharging gap K is connected in parallel with suppressing resistance R1 and R2 and switch Kg1 and Kg2.
Description
Technical field
The invention belongs to power grid security and technical field of preventing and reducing natural disasters.Transformer is suppressed based on graded resistance there is provided one kind
Accident occurs for the method and device of DC magnetic bias current, defence transformer and power network.
Background technology
When the collimation stream or DC current inflow transformer of certain value, the D.C. magnetic biasing of transformer core can be caused to satisfy
With.Transformer DC magnetic bias saturation can the harmful interference such as secondary harmonic wave, temperature rise and vibration, noise increase, threaten transformer and electricity
The safe operation of net, so that occur serious grid power blackout accident.
At present, the reason for occurring collimation stream or DC current in AC network, cause transformer DC magnetic bias saturation is wrapped
Include：The reasons such as geomagnetic storm, D. C. Electric transmission earthed pole and subway DC Traction Network.Although the bias current cause that these reasons are caused
Difference, but it is identical with the hazard mechanism of power network to transformer.It is straight by the intensity difference of geomagnetic storm, D. C. Electric transmission earthed pole and subway
Influence of the Traction networks at a distance of the not equal factor of distance of transformer station is flowed, the D.C. magnetic biasing of network transformer is produced and flow into power network
The value of electric current is not both the common feature of these reasons interference.According to the difference of the value of transformer DC magnetic bias current, sheet
Invention provides a kind of resistance access classes transformer neutral point, suppresses the reason DC magnetic bias current such as geomagnetic storm and direct current transportation
Method and device.
The content of the invention
It is an object of the invention to for the different DC magnetic bias current of unpredictable, value, design a kind of resistance classification
The neutral point of transformer is accessed, suppresses the method and device of transformer DC magnetic bias current.
The technical scheme is that：A kind of device for suppressing transformer DC magnetic bias current based on graded resistance, including：
Programmable logic controller PLC, suppresses resistance R1 and R2, switchs Kg1 and Kg2, AC current transformer Ta1 and DC current
Sensor Ta2, and graphene discharging gap K；The programmable logic controller PLC controls the switch Kg1's and Kg2
Break-make, the switch Kg1 controls suppress being switched in or out for resistance R1；Switch Kg2 control suppress resistance R2 access or
Disconnect；The DC current sensor Ta2 implements to switch Kg1 break-make by programmable logic controller PLC；The exchange
Current transformer Ta1 is used for the out-of-balance current for detecting transformer neutral point, and passes to programmable logic controller PLC notes
Record；The graphene discharging gap K is connected in parallel with suppressing resistance R1 and R2 and switch Kg1 and Kg2.
Further, the neutral point break-make that described device passes through knife switch Zd2 and knife switch Zd1 and transformer.
Further, 2 times of the resistance value for suppressing resistance R2 equal to R1.
Further, the graphene gap K flows through breakdown when resistance reaches certain voltage value, effective guarantor in high current
Resistance is protected, Simultaneous Switching Kg1 and Kg2 closure isolate the device from and sent alarm signal；When maximum resistance can not effectively suppress
During bias current, alarm signal is also sent.
Further, the programmable logic controller be used for protection switch and alterating and direct current current transformer and gather with
Processing information.
A kind of method that use said apparatus suppresses transformer DC magnetic bias current, comprises the following steps：
(1) when device comes into operation, knife switch Zd1 disconnects, knife switch Zd2 closures, switch Kg1 and Kg2 closures, becomes
Depressor neutral-point solid ground；
(2) when DC current sensor Ta2 detects DC current more than set-point, switch Kg1 disconnects, and suppresses resistance
R1 is accessed, and is first grade；
(3) when electric current increase is again above definite value, switch Kg1 closures, switch Kg2 disconnects, and suppresses resistance R2 (R2=
2R1) access, be second gear；
(4) when electric current continues to increase above definite value, switch Kg1 and switch Kg2 are disconnected, and resistance R1 and R2 are accessed simultaneously,
The resistance that suppresses of access is 3 times of R1, is third gear；
(5) when electric current is less than set-point, controller cuts off electricity successively by constantly detecting and feeding back according to resistance class
Resistance, realizes that three-level resistance switching is controlled.
Beneficial effects of the present invention：Transformer DC magnetic bias current suppressed based on graded resistance the invention provides a kind of
Method and device, by the DC current of measuring transformer neutral point, and current signal is transmitted to the controller of device, adapted to not
The need for being administered with capacity and core structure transformer to DC magnetic bias current, and varying strength geomagnetic storm and different operating modes it is straight
The need for DC magnetic bias current is administered under the conditions of the debugging of stream engineering, maintenance, to mitigation, suppression geomagnetic storm and D. C. Electric transmission earthed pole
Influence of the DC magnetic bias current to transformer and power grid security etc. reason is significant.
Brief description of the drawings
Fig. 1 is the application schematic diagram that the present invention suppresses transformer DC magnetic bias current device based on graded resistance.
Fig. 2 is control and the protection software flow that the present invention suppresses transformer DC magnetic bias current device based on graded resistance
Figure.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is described in more detail.
The invention provides a kind of device for suppressing transformer DC magnetic bias current based on graded resistance, it includes：It can compile
Program logic controller PLC, suppresses resistance R1 and R2, switchs Kg1 and Kg2, AC current transformer Ta1 and DC current sensing
Device Ta2, and graphene discharging gap K；The programmable logic controller PLC controls the switch Kg1's and Kg2 logical
Disconnected, the switch Kg1 controls suppress being switched in or out for resistance R1；The switch Kg2 controls suppress resistance R2 access or disconnected
Open；The DC current sensor Ta2 implements to switch Kg1 break-make by programmable logic controller PLC；The alternating current
Current transformer Ta1 is used for the out-of-balance current for detecting transformer neutral point, and passes to programmable logic controller PLC notes
Record；The graphene discharging gap K is connected in parallel with suppressing resistance R1 and R2 and switch Kg1 and Kg2.
Present invention also offers a kind of method that use said apparatus suppresses transformer DC magnetic bias current, including following step
Suddenly：
(1) when device comes into operation, knife switch Zd1 disconnects, knife switch Zd2 closures, switch Kg1 and Kg2 closures, becomes
Depressor neutral-point solid ground；
(2) when DC current sensor Ta2 detects DC current more than set-point, switch Kg1 disconnects, and suppresses resistance
R1 is accessed, and is first grade；
(3) when electric current increase is again above definite value, switch Kg1 closures, switch Kg2 disconnects, and suppresses resistance R2 (R2=
2R1) access, be second gear；
(4) when electric current continues to increase above definite value, switch Kg1 and switch Kg2 are disconnected, and resistance R1 and R2 are accessed simultaneously,
The resistance that suppresses of access is 3 times of R1, is third gear；
(5) when electric current is less than set-point, controller cuts off electricity successively by constantly detecting and feeding back according to resistance class
Resistance, realizes that three-level resistance switching is controlled.
Fig. 1 is the application schematic diagram that the present invention suppresses transformer DC magnetic bias current device based on graded resistance.Wherein, it is empty
Line part is three-level graded resistance formula transformer DC magnetic bias current restraining device of the present invention, knife switch Zd1 and knife switch
Zd2 is that the device is put into and disconnecting switch out of service.The K of dotted portion is put for the graphene of protection complexes and resistance
Electric gap；R1 controls it to be switched in or out to suppress resistance by switching Kg1；Suppress resistance R2=2R1, it is controlled by switching Kg2
It is switched in or out；Ta1 is AC current transformer；Ta2 is DC current sensor.The switch of dotted portion complexes and mutually
Protection and control, the collection of information and the processing of sensor are all controlled by programmable controller PLC, realize that complexes suppress
The function of bias current and its protection control of device.Fig. 2 is that the present invention suppresses transformer DC magnetic bias electricity based on graded resistance
Flow control and the protection software flow pattern of device.Complexes suppress the function of bias current and its protection of device by that can compile
Range controller realizes, is the function and protection, control logic and many secondary of the device the characteristics of using programmable controller
Wiring is all realized by software programming, can improve the reliability of complexes.
As shown in figure 1, when device comes into operation, disconnecting plug-in strip Zd1, plug-in strip Zd2, closure switch Kg1 and Kg2 are closed, is become
Depressor neutral-point solid ground；When DC current sensor Ta2 detects DC current more than set-point, switch Kg1 disconnects, suppression
Resistance R1 accesses processed, are first grade；When electric current increase is again above definite value, Kg1 closures, Kg2 disconnects, and suppresses resistance R2=
2R1 is accessed, and is second gear；When electric current continues to increase above definite value, switch Kg1 and Kg2 disconnect, and resistance R1 and R2 connect simultaneously
Enter, the suppression resistance of access is 3R1, is third gear.When electric current is less than certain set-point, controller can also be by continuous
Detection and feedback, according to resistance class successively off resistance, realize three-level resistance switching control.
When the high current caused by have short trouble or lightning impulse flows through resistance and reaches certain voltage value, between graphene
The breakdown effective protective resistances of gap K, Simultaneous Switching Kg1 and Kg2 closure, isolate the device from and send alarm signal；Work as maximum
When resistance effectively can not suppress bias current, alarm signal is also sent out.
Being administered due to bias current controls rate request not high switching, compared with the device of fixed switching 3R1 resistance, point
The precision that level resistive method suppresses bias current is higher, to prevent the fluctuation of geomagnetic storm reason bias current from causing graded resistance frequent
Switching, setting controller is adjusted once per 10s.Coordinate the software flow that above-mentioned hardware device operation is controlled and status information is handled
As shown in Figure 2.Fig. 2 flow simplicity of explanation is as follows：
Normal work：All registers are first resetted during input, then bias current numerical value are read to specified time, electric current is read
It is worth hour counter M0 and increases 1, if (the i.e. M0 in specified time<3) I of current value twice read is all higher than definite value I0 (i.e. M1=
2), then it is assumed that high current, the resistance value of 1 grade of increase occur；If the I of current value twice read in specified time is respectively less than 2/
3 limit value I0 (i.e. M2=2), then it is assumed that now resistance value is excessive, turns 1 grade of resistance value down.Rear PLC has been operated to continue cycling through
Read current value.(the resistance device mode bit U when maximum resistance effectively can not suppress bias current>3), controller signals
Alarm；(the I when electric current reaches the maximum current value that resistance device can bear>Imax), controller is alarmed and by switching Kg1
Electric current is cut off with Kg2.When have high current caused by short trouble or lightning impulse by when, controller also can controlling switch Kg1
With Kg2 closures, isolating device and hair alarm signal.The AC current transformer Ta1 is used to detect transformer neutral point not
Balanced balanced current, and pass to programmable controller PLC record.
Technical scheme is described in detail above-mentioned embodiment.It is apparent that the present invention is not limited institute
The embodiment of description.Based on above-mentioned embodiment, those skilled in the art can also make a variety of changes accordingly, but appoint
What is equal with the present invention or similar change belongs to the scope of protection of the invention.
Claims (6)
1. a kind of device for suppressing transformer DC magnetic bias current based on graded resistance, it is characterised in that described device includes：Can
Programme logic controller PLC, suppresses resistance R1 and R2, switchs Kg1 and Kg2, AC current transformer Ta1 and direct current spread
Sensor Ta2, and graphene discharging gap K；The programmable logic controller PLC controls the switch Kg1's and Kg2 logical
Disconnected, the switch Kg1 controls suppress being switched in or out for resistance R1；The switch Kg2 controls suppress resistance R2 access or disconnected
Open；The DC current sensor Ta2 implements to switch Kg1 break-make, the alternating current by programmable logic controller PLC
Current transformer Ta1 is used for the out-of-balance current for detecting transformer neutral point, and passes to programmable logic controller PLC notes
Record；The graphene discharging gap K is connected in parallel with suppressing resistance R1 and R2 and switch Kg1 and Kg2.
2. device according to claim 1, it is characterised in that described device by knife switch Zd2 and knife switch Zd1 with
The neutral point break-make of transformer.
3. device according to claim 1, it is characterised in that the resistance value of the suppression resistance R2 is equal to 2 times of R1.
4. device according to claim 1, it is characterised in that the graphene gap K flows through resistance in high current and reaches one
Determine breakdown during voltage value, effective protective resistance, Simultaneous Switching Kg1 and Kg2 closure isolates the device from and sent alarm signal
Number；When maximum resistance effectively can not suppress bias current, alarm signal is also sent.
5. device according to claim 1, it is characterised in that the programmable logic controller is used for protection switch and friendship
DC current transformer and collection and processing information.
6. a kind of method that use any of the above-described claim described device suppresses transformer DC magnetic bias current, its feature exists
In comprising the following steps：
(1) when device comes into operation, knife switch Zd1 disconnects, knife switch Zd2 closures, switch Kg1 and Kg2 closures, transformer
Neutral-point solid ground；
(2) when DC current sensor Ta2 detects DC current more than set-point, switch Kg1 disconnects, and suppresses resistance R1 and connects
Enter, be first grade；
(3) when electric current increase is again above definite value, switch Kg1 closures, switch Kg2 disconnects, and suppresses resistance R2 accesses, is second
Shelves；
(4) when electric current continues to increase above definite value, switch Kg1 and switch Kg2 are disconnected, and resistance R1 and R2 are accessed simultaneously, are accessed
The resistance that suppresses be 3 times of R1, be third gear；
(5) when electric current is less than set-point, controller cuts off resistance successively by constantly detecting and feeding back according to resistance class,
Realize that three-level resistance switching is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710432720.9A CN107317305A (en) | 2017-06-09 | 2017-06-09 | Suppress the method and device of transformer DC magnetic bias current based on graded resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710432720.9A CN107317305A (en) | 2017-06-09 | 2017-06-09 | Suppress the method and device of transformer DC magnetic bias current based on graded resistance |
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| Publication Number | Publication Date |
|---|---|
| CN107317305A true CN107317305A (en) | 2017-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710432720.9A Pending CN107317305A (en) | 2017-06-09 | 2017-06-09 | Suppress the method and device of transformer DC magnetic bias current based on graded resistance |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446708A (en) * | 2019-01-17 | 2020-07-24 | 国网山东省电力公司电力科学研究院 | Hierarchical adjustable series resistance power grid GIC restraining device and method |
| CN115566639A (en) * | 2022-11-14 | 2023-01-03 | 国网湖北省电力有限公司电力科学研究院 | Multi-parameter control transformer neutral point current abnormity protection method |
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| CN201345536Y (en) * | 2009-01-22 | 2009-11-11 | 广东省电力工业局试验研究所 | Transformer neutral point capacitance-resistance mixed type inhibition direct current device |
| CN202444249U (en) * | 2012-02-10 | 2012-09-19 | 宁夏电力公司电力科学研究院 | Neutral point DC magnetic biasing inhibiting device of transformer |
| CN104158166A (en) * | 2014-08-01 | 2014-11-19 | 南方电网科学研究院有限责任公司 | Impedance-adjustable resistance-capacitance series-connection type transformer direct-current magnetic bias limiting device |
| CN204333940U (en) * | 2014-11-26 | 2015-05-13 | 国家电网公司 | A kind of intelligence revises nonlinear resistance type resonance eliminator |
-
2017
- 2017-06-09 CN CN201710432720.9A patent/CN107317305A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201345536Y (en) * | 2009-01-22 | 2009-11-11 | 广东省电力工业局试验研究所 | Transformer neutral point capacitance-resistance mixed type inhibition direct current device |
| CN202444249U (en) * | 2012-02-10 | 2012-09-19 | 宁夏电力公司电力科学研究院 | Neutral point DC magnetic biasing inhibiting device of transformer |
| CN104158166A (en) * | 2014-08-01 | 2014-11-19 | 南方电网科学研究院有限责任公司 | Impedance-adjustable resistance-capacitance series-connection type transformer direct-current magnetic bias limiting device |
| CN204333940U (en) * | 2014-11-26 | 2015-05-13 | 国家电网公司 | A kind of intelligence revises nonlinear resistance type resonance eliminator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446708A (en) * | 2019-01-17 | 2020-07-24 | 国网山东省电力公司电力科学研究院 | Hierarchical adjustable series resistance power grid GIC restraining device and method |
| CN115566639A (en) * | 2022-11-14 | 2023-01-03 | 国网湖北省电力有限公司电力科学研究院 | Multi-parameter control transformer neutral point current abnormity protection method |
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Application publication date: 20171103 |
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