CN205067604U - Experimental equipment of integrating of single -phase short -circuit impedance of transformer - Google Patents
Experimental equipment of integrating of single -phase short -circuit impedance of transformer Download PDFInfo
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- CN205067604U CN205067604U CN201520394452.2U CN201520394452U CN205067604U CN 205067604 U CN205067604 U CN 205067604U CN 201520394452 U CN201520394452 U CN 201520394452U CN 205067604 U CN205067604 U CN 205067604U
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- circuit impedance
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Abstract
Experimental equipment of integrating of single -phase short -circuit impedance of transformer, its characterized in that: including overload protective device, wave form supervisory circuit, voltage regulator, transformer / rise stream ware, overload protective device establishes ties with the voltage regulator, the wave form supervisory circuit is parallelly connected with the voltage regulator, voltage regulator and transformer / rise to be connected to after the stream ware is established ties and tested the transformer the transformer / it still connects in parallel between stream ware and the quilt test transformer to rise there is compensating capacitor. The utility model provides an experimental equipment of integrating of single -phase short -circuit impedance of transformer will stand separately experimental components and parts and integrate, and it becomes an impedance tester in the control box all to integrate big current test transformer and current -voltage measuring device to.
Description
Technical field
The present invention relates to the integrated equipment of transformer single-phase short circuit impedance experiments, belong to electrical technology control field.
Background technology
After transformer is impacted by short-circuit current, or after being collided in transport installation process, Transformer Winding may be caused to deform, the degree of deformed damaged is relevant with the anti-short circuit capability of transformer own with suffered impact, if not to the utmost early detect deformation defect, very easily cause the generation of accident.
And after winding deformation, the short-circuit impedance of transformer also will make respective change.Therefore, short circuit impedance method is another important diagnostic method of deformation of transformer winding.Its principle is by the impedance of measuring transformer winding under 50Hz electric current or leakage reactance, judges whether Transformer Winding there occurs the distortion jeopardizing operation, as coil displacements, bulge, turn-to-turn short circuit, open circuit etc. by the change of impedance or leakage reactance value.GB and IEC standard all define the limit value of leakage reactance change under rated current, and IEC suggestion be exception more than 3%, and GB is thought and got 2% ~ 3% according to the difference of loop construction.Short-circuit impedance is tested as one of prerun project by U.S.'s ansi standard 96 years versions.
Current State Grid Corporation of China advances just actively and prudently and implements the work of high voltage electric power equip ment state-detection, and in conjunction with external advanced Maintenance Mode and domestic actual conditions, has formulated correlation behavior checking experiment code.According to repair based on condition of component regulations stipulate, impedance method is one of diagnostic method of monitoring Coefficients of Large Power Transformer Winding distortion, and the measuring current of low-voltage short circuit impedance method is at least 5A.For improving test accuracy, implementing repair based on condition of component thought, the utility model to how improving low-voltage short-circuit impedance experimental test electric current is inquired into 5A and above method, the problem of big current low-voltage short-circuit impedance test is carried out with the scene of solving, discrete test components and parts are carried out integrated, cranking test transformer and current-voltage measurement device is all integrated in control box and becomes an impedance instrument.
Summary of the invention
For the deficiencies in the prior art, the purpose of this utility model is to provide the integrated equipment of transformer single-phase short circuit impedance experiments, discrete test components and parts are carried out integrated, cranking test transformer and current-voltage measurement device is all integrated in control box and becomes an impedance instrument.
For achieving the above object, the present invention is realized by following technological means:
The integrated equipment of transformer single-phase short circuit impedance experiments; it is characterized in that: comprise overload protective device, waveform monitoring circuit, pressure regulator, transformer/current lifting device; described overload protective device is connected with pressure regulator; described waveform monitoring circuit is in parallel with pressure regulator; be connected to tested transformer after described pressure regulator is in parallel with transformer/current lifting device, between described transformer/current lifting device and tested transformer, be also parallel with compensation condenser.
Further:
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: described transformer/current lifting device is provided with two voltage gears, is respectively 1000V and 500V.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: described transformer/current lifting device is provided with two current gears, is respectively 1A, 2A, 3A, 4A, 5A, 10A.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: described pressure regulator is electric voltage regulator, pressure regulator is by Electric Machine Control, and working power is positive and negative 12V; When power supply is positive 12V, pressure regulator is rising power supply, and when power supply is negative 12V, pressure regulator is decline power supply.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: the voltage gear of described transformer/current lifting device and current gear adopt and automatically control.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: the output of described pressure regulator voltage adopts and automatically controls.
The invention has the beneficial effects as follows: the integrated equipment of transformer single-phase short circuit impedance experiments that the utility model provides, discrete test components and parts are carried out integrated, cranking test transformer and current-voltage measurement device is all integrated in control box and becomes an impedance instrument.
Accompanying drawing explanation
Fig. 1 is compensation principle figure; Fig. 2 the utility model circuit composition structural representation.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
For load test, simple increase surge capacity is difficult to the voltage and current needs met in load test.Solution is: the method on the one hand by increasing step-up transformer improves trial voltage; By the mode of reactive-load compensation, testing equipment electric current can be reduced and exports on the other hand.As taked suitable Capacitor banks in parallel with distribution transforming, the perception utilizing the capacitive reactive power of Capacitor banks counteracting distribution transforming to consume is idle, thus the electric current effectively reducing power supply and pressure regulator exports.Compensation principle is as Fig. 1 (in figure, ZT is testing equipment equiva lent impedance, and ZC is Capacitor banks impedance, and ZB is distribution transforming short-circuit impedance).
In order to reach good compensation effect, the capacitive reactive power of Capacitor banks should relatively the perception that consumes of distribution transforming be idle, i.e. ZC ≈ ZB.But after over-compensation, i.e. ZC < ZB, forms LC loop, cause to hold rising phenomenon, especially when ZT+ZB-ZC=0 time, series resonance occurs, and therefore reactive-load compensation should control at about 50%-80%.
At the scene in test, to dispatch from the factory data by reference to transformer, select suitable Capacitor banks to compensate.Rise phenomenon even series resonance to prevent from causing during over-compensation holding, inductive reactive power compensation degree should control at about 50%-80%, and can meet test condition to greatest extent, correlation computations is as follows:
Electric capacity is withstand voltage gets 2000 volts.
Consider after taking to increase step-up transformer and Capacitor banks, the exploitation of complete equipment also comprises curve visual in image for Test data generation, instead of only obtains several data point.In test, we encounter the zero sequence impedance test of transformer, the impedance experiments project such as positive sequence, zero sequence impedance test of circuit, and these test objectives obtain a data point, calculate or the adjustment of fortune side for system short-circuit.And the single phase impedance test objective of main transformer to transformer, whether winding deformation occurs to diagnose, therefore generate one intuitively curve will be conducive to the contrast between interphased data and historical data.Not only there is the function at display strong point, also there is the function of formation curve.Consider that test figure will contrast, complete equipment should have the function of storage at least six curves.Article three, contrast for phase half interval contour, three contrast for homophase historical data.
As shown in Figure 2; the integrated equipment of transformer single-phase short circuit impedance experiments; it is characterized in that: comprise overload protective device, waveform monitoring circuit, pressure regulator, transformer/current lifting device; described overload protective device is connected with pressure regulator; described waveform monitoring circuit is in parallel with pressure regulator; be connected to tested transformer after described pressure regulator is in parallel with transformer/current lifting device, between described transformer/current lifting device and tested transformer, be also parallel with compensation condenser.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: described transformer/current lifting device is provided with two voltage gears, is respectively 1000V and 500V.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: described transformer/current lifting device is provided with two current gears, is respectively 1A, 2A, 3A, 4A, 5A, 10A.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: described pressure regulator is electric voltage regulator, pressure regulator is by Electric Machine Control, and working power is positive and negative 12V; When power supply is positive 12V, pressure regulator is rising power supply, and when power supply is negative 12V, pressure regulator is decline power supply.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: the voltage gear of described transformer/current lifting device and current gear adopt and automatically control.
The described integrated equipment of transformer single-phase short circuit impedance experiments, is characterized in that: the output of described pressure regulator voltage adopts and automatically controls.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the design is not restricted to the described embodiments; the principle that the design is just described described in above-described embodiment and instructions; under the prerequisite not departing from the design's spirit and scope; the design also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the design.The claimed scope of the design is defined by appending claims and equivalent thereof.
Claims (6)
1. the integrated equipment of transformer single-phase short circuit impedance experiments; it is characterized in that: comprise overload protective device, waveform monitoring circuit, pressure regulator, transformer/current lifting device; described overload protective device is connected with pressure regulator; described waveform monitoring circuit is in parallel with pressure regulator; be connected to tested transformer after described pressure regulator is in parallel with transformer/current lifting device, between described transformer/current lifting device and tested transformer, be also parallel with compensation condenser.
2. the integrated equipment of transformer single-phase short circuit impedance experiments as claimed in claim 1, is characterized in that: described transformer/current lifting device is provided with two voltage gears, is respectively 1000V and 500V.
3. the integrated equipment of transformer single-phase short circuit impedance experiments as claimed in claim 2, is characterized in that: described transformer/current lifting device is provided with two current gears, is respectively 1A, 2A, 3A, 4A, 5A, 10A.
4. the integrated equipment of transformer single-phase short circuit impedance experiments as claimed in claim 1, it is characterized in that: described pressure regulator is electric voltage regulator, pressure regulator is by Electric Machine Control, and working power is positive and negative 12V; When power supply is positive 12V, pressure regulator is rising power supply, and when power supply is negative 12V, pressure regulator is decline power supply.
5. the integrated equipment of transformer single-phase short circuit impedance experiments as described in claim 2 or 3, is characterized in that: the voltage gear of described transformer/current lifting device and current gear adopt and automatically control.
6. the integrated equipment of transformer single-phase short circuit impedance experiments as claimed in claim 4, is characterized in that: the output of described pressure regulator voltage adopts and automatically controls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520394452.2U CN205067604U (en) | 2015-06-10 | 2015-06-10 | Experimental equipment of integrating of single -phase short -circuit impedance of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520394452.2U CN205067604U (en) | 2015-06-10 | 2015-06-10 | Experimental equipment of integrating of single -phase short -circuit impedance of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205067604U true CN205067604U (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520394452.2U Expired - Fee Related CN205067604U (en) | 2015-06-10 | 2015-06-10 | Experimental equipment of integrating of single -phase short -circuit impedance of transformer |
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| CN (1) | CN205067604U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983327A (en) * | 2020-07-15 | 2020-11-24 | 大唐水电科学技术研究院有限公司 | Method for measuring grounding impedance of large grounding grid |
-
2015
- 2015-06-10 CN CN201520394452.2U patent/CN205067604U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983327A (en) * | 2020-07-15 | 2020-11-24 | 大唐水电科学技术研究院有限公司 | Method for measuring grounding impedance of large grounding grid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20160610 |