CN103248010A - Method for suppressing phenomena of ferromagnetic resonance and fuse melting of voltage transformer - Google Patents
Method for suppressing phenomena of ferromagnetic resonance and fuse melting of voltage transformer Download PDFInfo
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- CN103248010A CN103248010A CN2013101515405A CN201310151540A CN103248010A CN 103248010 A CN103248010 A CN 103248010A CN 2013101515405 A CN2013101515405 A CN 2013101515405A CN 201310151540 A CN201310151540 A CN 201310151540A CN 103248010 A CN103248010 A CN 103248010A
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- electromagnetic
- transformer
- potential transformer
- electromagnetic potential
- voltage transformer
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Abstract
The invention relates to a method for suppressing phenomena of ferromagnetic resonance and fuse melting of a voltage transformer. Three identical three-phase electromagnetic voltage transformers with Y0/Y0/Delta wiring modes are provided. The method comprises the step as follows: fourth electromagnetic voltage transformers are additionally arranged between neutral points of the identical three-phase electromagnetic voltage transformers with the Y0/Y0/Delta wiring modes and the ground. According to the method, the fourth electromagnetic voltage transformers are additionally arranged between the neutral points of the identical three-phase electromagnetic voltage transformers with the Y0/Y0/Delta wiring modes and the ground, a circuit is changed, so that no crossing point exists between volt-ampere characteristics of ground capacitance of a line and equivalent volt-ampere characteristics of an inductive branch comprising an iron core, a ferromagnetic resonance phenomenon is suppressed, the zero sequence equivalent impedance of the whole electromagnetic voltage transformer branch is greatly increased, and the high voltage fuse melting of the voltage transformer branch is effectively suppressed.
Description
Technical field
The invention belongs to the applied technical field of voltage transformer in the power system high tension power line, be specifically related to the inhibition method of a kind of voltage transformer ferro resonance and fuse melting phenomenon.
Background technology
In the 10kV of electric power system at present, the 35kV isolated neutral power distribution network, the electromagnetic potential transformer of installing on the bus (PT) is Y normally
0/ Y
0/ delta connection.Because the fuse failure problem that causes of system single-phase earth fault happens occasionally, when serious even burn PT.A lot of researchs in the past all ascribe the reason of PT high pressure fuse melting to ferro resonance, and the overcurrent that produces when thinking system's generation ferro resonance phenomenon causes fuse melting.
The equivalent electric circuit of Electromagnetic PT as shown in Figure 1, when system normally moves, no matter when, the system line direct-to-ground capacitance with the total electrical charge sum be zero, but when a phase ground connection, two phase voltages are elevated to line voltage in addition, have also just filled the electric charge that adapts with line voltage on their direct-to-ground capacitance with.Also when lasting, under the on-Line Voltage effect, electric charge is that path moves in circles between lead and the earth (pole plate and another pole plate that are equivalent to capacitor) with the earth point to earth fault, forms capacitance current.After earth fault is eliminated, just be equivalent to electric charge on the lead direct-to-ground capacitance is led to the path of the earth to having been cut off, this moment, each line-to-earth voltage tried hard to return to the level under the normal operating condition, namely revert to phase voltage value, and the lead of original non-fault phase is the electric charge that fills with corresponding line voltage, and these electric charges must find a way out and let out toward the earth.Because original earth point is cut off, a winding of instrument transformer just becomes their path, if free charge is a lot, will cause the too saturated of iron core letting out in the process of the earth, voltage transformer with supersaturation iron core, under the effect of power frequency supply voltage, very big impulse current will occur, and cause fuse melting.
In addition, in isolated neutral system, after system's single-phase earthing disappeared, the ferro-resonance over-voltage that the Electromagnetic PT core sataration causes might make system's direct-to-ground capacitance and PT high-pressure side inductance be complementary, and ferro resonance takes place.High-frequency resonant in the ferro resonance, its resonance current is less, and deficiency makes fuse failure, and when fundamental frequency and frequency division, resonance current is bigger, can cause fuse failure under certain condition, but the main cause of Electromagnetic PT high pressure fuse melting phenomenon is not the overcurrent that ferro resonance causes.
The Electromagnetic PT ferro resonance is to be subjected to certain impact in system, during as unloaded bus combined floodgate and single phase ground fault disappearance, the PT core sataration, the direct-to-ground capacitance coupling of its equivalent reactance and circuit and equipment produces, and namely the voltage-current characteristic of line mutual-ground capacitor intersects at a point with the voltage-current characteristic that contains the iron core inductance; And PT high pressure fuse melting mainly is the line mutual-ground capacitor discharge after being recovered by earth fault, and the impulse current that produces in the insurance of PT high pressure causes.
Ferro resonance and high pressure fuse melting phenomenon are two outstanding problems in the Electromagnetic PT actual motion, if can solve this two problems relevant with PT simultaneously by a kind of scheme, the operation at scene are had practical value very much.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, and the inhibition method of a kind of voltage transformer ferro resonance and fuse melting phenomenon is provided.
The present invention solves its technical problem and takes following technical scheme to realize:
The inhibition method of a kind of voltage transformer ferro resonance and fuse melting phenomenon comprises three identical three-phase Y
0/ Y
0The electromagnetic potential transformer of/delta connection mode, innovative point of the present invention are that this method is at three-phase Y
0/ Y
0Install the 4th electromagnetic potential transformer between the electromagnetic potential transformer neutral point of/delta connection mode and the ground additional.
And, described the 4th electromagnetic potential transformer that installs additional, its equivalent reactance design load is 1.5 times of former three-phase electricity magnetic-type voltage transformer equivalent reactance, after adopting four electromagnetic potential transformer methods, the zero sequence equivalent impedance of whole electromagnetic potential transformer branch road is 5 times of former three-phase electricity magnetic-type voltage transformer wiring zero sequence equivalent impedance.
And described the 4th electromagnetic potential transformer structurally adopts semi-insulating mode, and the volume of the 4th electromagnetic potential transformer equals single volume of former threephase potential transformer.
And each the electromagnetic potential transformer no-load voltage ratio in the described employing four electromagnetic potential transformer methods all adopts
With
Numerical value, the electrical metering of safeguards system and the protection monitoring function.
Advantage of the present invention and good effect are:
The present invention is by increasing the 4th electromagnetic potential transformer between neutral point and ground, make the voltage-current characteristic of line mutual-ground capacitor and the equivalent voltage-current characteristic that contains the iron core inductive branch not have intersection point by changing circuit, thereby suppressed the ferro resonance phenomenon, and the zero sequence equivalent impedance of whole electromagnetic potential transformer branch road is increased greatly, effectively suppressed the fusing of the high pressure insurance of voltage transformer branch road.
Description of drawings
Fig. 1 is Y
0/ Y
0Capacitor discharge impulse current after the fault recovery of/delta connection formula Electromagnetic PT forms schematic diagram;
Fig. 2 is Y
0/ Y
0The equivalent circuit diagram of/delta connection formula Electromagnetic PT;
Fig. 3 is Y
0/ Y
0Install the equivalent circuit diagram of the 4th Electromagnetic PT between the neutral point of/delta connection formula Electromagnetic PT and the ground additional;
Fig. 4 is the elementary diagram of four Electromagnetic PT methods;
Fig. 5 is the equivalent circuit diagram of single-phase electricity magnetic-type PT;
Fig. 6 is the simplified electrical circuit diagram of single-phase electricity magnetic-type PT equivalent electric circuit;
Fig. 7 is the zero sequence equivalent simplified electrical circuit diagram of three-phase electricity magnetic-type PT;
Fig. 8 is the zero sequence equivalent simplified electrical circuit diagram of four Electromagnetic PT methods.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is further described:
The inhibition method of a kind of voltage transformer ferro resonance and fuse melting phenomenon, as shown in Figure 2, former three-phase Y
0/ Y
0/ delta connection mode electromagnetic potential transformer (PT) comprises three identical Electromagnetic PT, and the innovation of the inventive method is, as shown in Figure 3, and at former three-phase Y
0/ Y
0Install the 4th Electromagnetic PT between the neutral point of/delta connection mode Electromagnetic PT and the ground additional.
In the concrete enforcement of the inventive method, described the 4th Electromagnetic PT that installs additional, excitation reactance is designed to high impedance, parameter area is in mega-ohms, its equivalent reactance design load is 1.5 times of former three-phase electricity magnetic-type PT equivalent reactance, after adopting four Electromagnetic PT methods, the zero sequence equivalent impedance of whole Electromagnetic PT branch road is 5 times of former three Electromagnetic PT wiring zero sequence equivalent impedances.
In the concrete enforcement of the inventive method, described the 4th Electromagnetic PT structurally adopts semi-insulating mode, a high-tension insulating bushing outlet, both reduced the shared space outerpace volume of voltage transformer, increased simultaneously space in the voltage transformer shell again, increased the coil windings number of turn of voltage transformer accordingly, increased the on high-tension side equivalent reactance of voltage transformer, the iron core magnetic that has reduced voltage transformer is close, increased the unsaturated interval of iron core, the volume of the 4th Electromagnetic PT equals single the volume of former three-phase PT.
In the concrete enforcement of the inventive method, each the Electromagnetic PT no-load voltage ratio in the described employing four Electromagnetic PT methods all adopts special value,
With
Cooperate the wiring of four Electromagnetic PT methods, the electrical metering of energy safeguards system and protection monitoring function, the wiring of described four Electromagnetic PT methods is the 4th Electromagnetic PT that installs additional in the frame of broken lines among the figure as shown in Figure 6.
Operation principle of the present invention
The equivalent electric circuit of single-phase electricity magnetic-type PT as shown in Figure 5, Z
mBe the excitation reactance of Electromagnetic PT, Z
1And Z
2Be respectively the leakage reactance of the former limit of Electromagnetic PT, secondary, with respect to Z
mNumerical value is very little.
Because the zero sequence winding of three-phase electricity magnetic-type PT secondary side is connected into open delta in the system, so three-phase electricity magnetic-type PT whenever relatively can ignore its former limit, secondary leakage reactance, be simplified to excitation reactance, as shown in Figure 6, three-phase electricity magnetic-type PT zero sequence equivalent circuit, then as shown in Figure 7, both when system single-phase earth fault disappeared, the zero sequence equivalent impedance of related PT branch road impulse current size was Z
m/ 3.
Installed additional after the 4th Electromagnetic PT, supposed that the excitation reactance of the 4th Electromagnetic PT equates with the excitation reactance of former three-phase electricity magnetic-type PT, then the zero sequence equivalent of four Electromagnetic PT schemes is simplified circuit as shown in Figure 8.
As seen, after having installed the 4th Electromagnetic PT additional, the zero sequence equivalent impedance of whole PT branch road is by original 1/3Z
mIncrease and be 4/3Z
m, increased 4 times during than former three Electromagnetic PT.This also means, under the condition identical with former three Electromagnetic PT, the impulse current of Electromagnetic PT branch road in four Electromagnetic PT methods will be reduced to originally 1/4 if ignore other influencing factors, effectively suppress the fusing of PT high pressure insurance.
It is emphasized that; embodiment of the present invention is illustrative; rather than it is determinate; therefore the present invention is not limited to the embodiment described in the embodiment; every other execution modes that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope of protection of the invention equally.
Claims (4)
1. the inhibition method of a voltage transformer ferro resonance and fuse melting phenomenon comprises three identical three-phase Y
0/ Y
0The electromagnetic potential transformer of/delta connection mode is characterized in that: this method is at three-phase Y
0/ Y
0Install the 4th electromagnetic potential transformer between the electromagnetic potential transformer neutral point of/delta connection mode and the ground additional.
2. the inhibition method of voltage transformer ferro resonance according to claim 1 and fuse melting phenomenon, it is characterized in that: described the 4th electromagnetic potential transformer that installs additional, its equivalent reactance design load is 1.5 times of former three-phase electricity magnetic-type voltage transformer equivalent reactance, after adopting four electromagnetic potential transformer methods, the zero sequence equivalent impedance of whole electromagnetic potential transformer branch road is 5 times of former three-phase electricity magnetic-type voltage transformer wiring zero sequence equivalent impedance.
3. the inhibition method of voltage transformer ferro resonance according to claim 1 and fuse melting phenomenon, it is characterized in that: described the 4th electromagnetic potential transformer structurally adopts semi-insulating mode, and the volume of the 4th electromagnetic potential transformer equals single volume of former threephase potential transformer.
4. the inhibition method of voltage transformer ferro resonance according to claim 1 and fuse melting phenomenon, it is characterized in that: each the electromagnetic potential transformer no-load voltage ratio in the described employing four electromagnetic potential transformer methods all adopts
With
Numerical value, the electrical metering of safeguards system and the protection monitoring function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101515405A CN103248010A (en) | 2013-04-27 | 2013-04-27 | Method for suppressing phenomena of ferromagnetic resonance and fuse melting of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101515405A CN103248010A (en) | 2013-04-27 | 2013-04-27 | Method for suppressing phenomena of ferromagnetic resonance and fuse melting of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103248010A true CN103248010A (en) | 2013-08-14 |
Family
ID=48927319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101515405A Pending CN103248010A (en) | 2013-04-27 | 2013-04-27 | Method for suppressing phenomena of ferromagnetic resonance and fuse melting of voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103248010A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000048287A1 (en) * | 1999-02-12 | 2000-08-17 | Inverpower Controls Ltd. | Ferroresonance-suppressing static transfer switch |
| CN102170121A (en) * | 2011-04-21 | 2011-08-31 | 华北电力大学（保定） | Resonance eliminator with correcting potential transformer |
-
2013
- 2013-04-27 CN CN2013101515405A patent/CN103248010A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000048287A1 (en) * | 1999-02-12 | 2000-08-17 | Inverpower Controls Ltd. | Ferroresonance-suppressing static transfer switch |
| CN102170121A (en) * | 2011-04-21 | 2011-08-31 | 华北电力大学（保定） | Resonance eliminator with correcting potential transformer |
Non-Patent Citations (1)
| Title |
|---|
| 刘喆: "配电网消弧及铁磁谐振监测与控制技术的研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》, 15 February 2009 (2009-02-15), pages 25 - 39 * |
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Application publication date: 20130814 |