CN204794020U - Transformer system - Google Patents
Transformer system Download PDFInfo
- Publication number
- CN204794020U CN204794020U CN201520361692.2U CN201520361692U CN204794020U CN 204794020 U CN204794020 U CN 204794020U CN 201520361692 U CN201520361692 U CN 201520361692U CN 204794020 U CN204794020 U CN 204794020U
- Authority
- CN
- China
- Prior art keywords
- transformer
- pass switch
- transformer system
- voltage
- voltage transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a transformer system, this transformer system include the suppression device of transformer high voltage winding and dc magnetic biasing electric current, and suppression device includes bypass protection device, and bypass protection device includes the controllable adjustable clearance of interval, the bypass switch, concatenates the neutral point into transformer high voltage winding after clearance and the bypass switch are parallelly connected. The utility model discloses a setting up suppression device, can effectively restraining the direct current earthing pole and go into the ground current to the influence of the transformer of transformer substation's neutral -point solid ground, its simple structure, small, simple to operate, fund input be less, when not changing transformer normal operating ground connection mode, do not have influence etc. To line protection.
Description
Technical field
The utility model relates to a kind of voltage transformer system.
Background technology
In recent years, along with rapid economic development, energy demand increases fast, and remote, high-capacity direct current power transmission engineering develops rapidly.China's shortage of land resource, DC transmission engineering earth electrode and AC Substation are in a lot of local close proximity, and AC Substation transformer inevitably will be subject to the impact of direct current grounding pole earth current.When DC line one pole take the earth as loop operation, huge direct current is formed loop with the earth, flows through and can have an impact to neighbouring AC system from the earth.One pole or bipolar take the earth as loop when running, potential difference can be formed between AC Substation, direct current will flow through Transformer Winding by transformer neutral point and transmission line, make transformer occur bias phenomenon.The zone of saturation that in AC network, neutral-point solid ground transformer is operated in excitation curve can cause that its vibration is violent, noise poly-ly rises, overheated and ac grid voltage resultant distortion rate significantly raises, and can cause the damage of transformer time serious.
The impact of DC magnetic bias current on transformer comprises: 1, noise increases; 2, on the impact of voltage waveform; Transformer copper loss increases; Transformers Iron Loss increases.
Direct current grounding pole earth current has following features to substation transformer impact: the time uncertain (fault or occur between turn(a)round), action time short (several hours), earth current amplitude large (upper kiloampere), positive-negative polarity is uncertain, affects large feature to transformer.At present, kiowatt has recognized the seriousness that direct current grounding pole earth current affects substation transformer at home.Present stage has the method and apparatus of multiple suppression transformer DC magnetic bias current, mainly contains electric capacity and seals in the method and apparatus such as small resistor, reverse dc, potential compensation every straight, neutral point.
Wherein, whether electric capacity is that isolated DC is relatively more thorough every straight device advantage, by switch control rule by electric capacity and spark gap bypass, also very convenient.Shortcoming is that package unit is comparatively complicated, takes up an area more, cost very high (up to 1,000,000 RMB), realizes difficulty still comparatively large, and for each side such as system overvoltage, insulation coordination to affect X factor more, check difficulty.In addition, seal in electric capacity and also likely cause system resonance.
Between neutral point and earth mat, seal in a resistance is the small resistor of several ohm, and the direct current that neutral point can be made to flow into obviously reduces, and reaches acceptable degree in engineering.Neutral point seals in impedance and creates impact to system zero order parameter, and then also can have influence on adjusting of relaying protection.The shortcoming of this scheme cannot offset direct current completely to flow into from neutral point, but due to its definite conception, be relatively easy to realize, also less on the impact of system.
Reverse dc and the complexity of the device involved by potential compensation method, be difficult to realize, present stage there is no application.
Summary of the invention
For the shortcoming of prior art, the purpose of this utility model is to provide a kind of voltage transformer system
To achieve these goals; the utility model provides a kind of voltage transformer system; this voltage transformer system comprises the restraining device of transformer high-voltage winding and DC magnetic bias current; restraining device comprises bypass protector; bypass protector comprises the adjustable gap of spacing-controllable, by-pass switch, and gap and by-pass switch parallel connection are connected in series the neutral point into transformer high-voltage winding afterwards.
Restraining device of the present utility model to be connected in series into transformer neutral point behind gap adjustable for spacing-controllable and by-pass switch parallel connection, reaches the object intercepting the backflow of the earth direct current.Control device, after monitoring transformer neutral point place DC magnetic bias current excessive (being greater than the operating current preset), by bypass switch opens, namely disconnects transformer neutral point grounded circuit, a gap is sealed in loop, cut off DC magnetic bias current.Now, as there is short trouble in circuit, gap both end voltage will sharply increase, thus puncture, fault current of releasing in time, avoids the overvoltage of the damage neutral point occurred thus and the destruction to relaying protection system.When two ends, gap direct voltage is less than the operation voltage preset, illustrate that now DC magnetic bias current is very little, does not affect the operation of transformer, now, by-pass switch closes, and gap is exited, the direct ground connection of transformer neutral point.
In the utility model, gap is the adjustable gap of spacing-controllable, and the distance namely between the ball electrode of gap two can adjust as required, set.
In the utility model, by-pass switch is by the electric current of tens amperes.
In the utility model, operating current, the operation voltage of by-pass switch can set according to demand, adjust.
In the utility model, action situation, the transformer operation conditions (ground connection, insulation) of transformer DC magnetic bias current size, restraining device can be sent to grid operating monitoring department in real time, and grid operating monitoring department can grasp Transformer Operation Status in real time.
With electric capacity compared with the straight device, restraining device of the present utility model, owing to not having bulky capacitor, takes up an area less, and cost is very low, there is not the impact on each side such as system overvoltage, insulation coordination, relaying protections, also there is not the risk causing system resonance.
Compared with small resistor device, restraining device of the present utility model can eliminate DC magnetic bias current completely, and meanwhile, control gap is the input coefficient when D.C. magnetic biasing is larger only, and transformer is direct ground connection under normal circumstances, on transformer operation manners without impact.
Compare with the device involved by potential compensation method with reverse dc; restraining device of the present utility model has that structure is simple, volume is very little, easy for installation, fund input is less, does not change earthing mode when transformer normally runs, on route protection without advantages such as impacts, be beneficial in engineering and apply.
According to another embodiment of the utility model, restraining device comprises further: for measuring the voltage measuring apparatus of by-pass switch both end voltage.
According to another embodiment of the utility model, restraining device comprises further: for measuring the current measuring device by by-pass switch electric current.
According to another embodiment of the utility model, restraining device comprises further: for controlling the opening and closing of by-pass switch and regulating the control device of gap clearance size.
According to another embodiment of the utility model, control device comprises logical circuit.
According to another embodiment of the utility model, control device is provided with lightning protection device, damages under lightning overvoltage to prevent control device.
According to another embodiment of the utility model, by-pass switch is provided with lightning protection device, damages under lightning overvoltage to prevent by-pass switch.
According to another embodiment of the utility model, the excursion in gap is 1cm-10cm.
According to another embodiment of the utility model, by-pass switch is vacuum or the closed structure of filling other inert gas, and during to avoid because of drop-out current, the electric spark between switch contacts causes and fires risk.
According to another embodiment of the utility model, the operate time of by-pass switch meets: t≤100ms.
Compared with prior art, the utility model possesses following beneficial effect:
The utility model is by arranging restraining device; direct current grounding pole earth current effectively can be suppressed the impact of the transformer of transformer station's neutral-point solid ground, its structure is simple, volume is little, easy for installation, fund input is less, not change earthing mode when transformer normally runs, on route protection without impact etc.
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the voltage transformer system of embodiment 1.
Embodiment
Embodiment 1
As shown in Figure 1, the voltage transformer system of the present embodiment comprises: transformer high-voltage winding 1 and the restraining device for DC magnetic bias current.Restraining device comprises bypass protector, measurement mechanism, control device.
Wherein, bypass protector comprises gap 2, by-pass switch T, is connected in series into transformer neutral point after gap 2 and by-pass switch T parallel connection; Gap 2 is formed by two ball electrodes, and its spacing is controllable, and the distance namely between the ball electrode of gap two can adjust as required, set.The excursion in gap 2 is 1cm-10cm.By-pass switch T is vacuum or the closed structure of filling other inert gas, and during to avoid because of drop-out current, the electric spark between switch contacts causes and fires risk, and its operate time meets: t≤100ms.
Measurement mechanism is for measuring the voltage at by-pass switch two ends and the electric current by by-pass switch; It comprises for measuring the instrument of by-pass switch both end voltage (gap voltage) and the instrument for measuring loop current on by-pass switch loop.
Control device comprises logical circuit, and the voltage and current measured by measurement mechanism and the operation voltage preset and operating current compare by it; When electric current exceedes operating current, then bypass switch opens; When voltage is lower than operation voltage, then closes bypass switch.Control device also regulates the size in gap in addition.
By-pass switch and control device are equipped with lightning protection device, damage under lightning overvoltage to prevent by-pass switch and control device.
The operation principle of the present embodiment is as follows:
When transformer receive direct current grounding pole earth current affect time, it is larger that electric current is flow through at by-pass switch T loop place, when electric current is greater than the operating current I of setting, control system sends command switch T and will disconnect in 100ms, transformer is by control gap ground connection, now, transformer does not affect by DC magnetic bias current.Now; as there is short trouble in circuit; gap both end voltage will sharply increase; thus puncture, fault current of releasing in time; effectively avoid the overvoltage of the damage neutral point occurred thus and the destruction to relaying protection system; therefore, this device does not affect transformer insulated coordinated scheme and circuit relay protection system.When by-pass switch T two ends (gap two ends of also can controlling ball) voltage is lower than the operation voltage U set, control system sends command switch T and will close in 100ms, the direct ground connection of transformer, recovers normal operating condition.
Although the utility model discloses as above with preferred embodiment, and be not used to the scope limiting the utility model enforcement.Any those of ordinary skill in the art, not departing from invention scope of the present utility model, when doing a little improvement, namely every equal improvement done according to the utility model, should be scope of the present utility model and contained.
Claims (10)
1. a voltage transformer system; it is characterized in that; described voltage transformer system comprises the restraining device of transformer high-voltage winding and DC magnetic bias current; described restraining device comprises bypass protector; described bypass protector comprises the adjustable gap of spacing-controllable, by-pass switch, and described gap and described by-pass switch parallel connection are connected in series the neutral point into described transformer high-voltage winding afterwards.
2. voltage transformer system according to claim 1, is characterized in that, described restraining device comprises further: for measuring the voltage measuring apparatus of described by-pass switch both end voltage.
3. voltage transformer system according to claim 1, is characterized in that, described restraining device comprises further: for measuring the current measuring device by described by-pass switch electric current.
4. voltage transformer system according to claim 1, is characterized in that, described restraining device comprises further: for controlling the opening and closing of described by-pass switch and regulating the control device of described gap clearance size.
5. voltage transformer system according to claim 4, is characterized in that, described control device comprises logical circuit.
6. voltage transformer system according to claim 4, is characterized in that, described control device is provided with lightning protection device.
7. voltage transformer system according to claim 1, is characterized in that, described by-pass switch is provided with lightning protection device.
8. voltage transformer system according to claim 1, is characterized in that, the excursion in described gap is 1cm-10cm.
9. voltage transformer system according to claim 1, is characterized in that, described by-pass switch is vacuum or the closed structure of filling other inert gas.
10. voltage transformer system according to claim 1, is characterized in that, the operate time of described by-pass switch meets: t≤100ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520361692.2U CN204794020U (en) | 2015-05-29 | 2015-05-29 | Transformer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520361692.2U CN204794020U (en) | 2015-05-29 | 2015-05-29 | Transformer system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204794020U true CN204794020U (en) | 2015-11-18 |
Family
ID=54534003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520361692.2U Active CN204794020U (en) | 2015-05-29 | 2015-05-29 | Transformer system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204794020U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558406A (en) * | 2016-10-10 | 2017-04-05 | 中国电力科学研究院 | A kind of suppressing method of power transformer D.C. magnetic biasing |
-
2015
- 2015-05-29 CN CN201520361692.2U patent/CN204794020U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558406A (en) * | 2016-10-10 | 2017-04-05 | 中国电力科学研究院 | A kind of suppressing method of power transformer D.C. magnetic biasing |
| CN106558406B (en) * | 2016-10-10 | 2019-07-09 | 中国电力科学研究院 | A kind of suppressing method of power transformer D.C. magnetic biasing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203942275U (en) | A kind of 35kV isolated neutral power distribution network ferro resonance restraining device | |
| CN103208788B (en) | Intelligent Dynamic power network neutral point earthing method and the complete sets of equipment | |
| CN203151088U (en) | Single-phase grounding fault isolation device | |
| CN105356441A (en) | Intelligent PT harmonic elimination and phase selection method and device | |
| CN204012678U (en) | A kind of power distribution network multimode ground protection system | |
| CN205123243U (en) | Lightning protection surge protector | |
| CN110389276A (en) | A kind of singlephase earth fault management system and method | |
| CN205544206U (en) | Intelligence PT harmonic elimination selects device of looks | |
| CN104779604A (en) | Neutral ground resistor cabinet | |
| CN202651781U (en) | Neutral point integrated grounding complete device | |
| CN110474314A (en) | A kind of shunt capacitor overvoltage absorbing device | |
| CN104575992A (en) | Online monitoring and isolation device for direct current magnetic bias of power transformer | |
| CN107332226B (en) | Overvoltage suppressing system based on intelligent switch | |
| CN105048435A (en) | Suppression device for direct-current biasing current of transformer and control method | |
| CN211206745U (en) | Single-phase earth fault management system | |
| CN204794020U (en) | Transformer system | |
| CN102290805A (en) | Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system | |
| CN204333940U (en) | A kind of intelligence revises nonlinear resistance type resonance eliminator | |
| CN105186473B (en) | A kind of restraining device of DC magnetic bias current for transformer high-voltage winding | |
| CN207339261U (en) | A kind of overvoltage protection device for preventing high pressure from sealing in electrification display | |
| CN201690231U (en) | Nonlinear neutral point ground resistor | |
| CN202949205U (en) | Lightning arrester overvoltage protection device with variable voltage ratio | |
| CN204835522U (en) | Transformer dc magnetic biasing electric current suppression device | |
| CN103124063B (en) | Arrester overvoltage protection device with variable voltage ratio and implementation method | |
| CN204012700U (en) | Power network neutral point grounding system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |