CN204204625U - A kind of isolated neutral system intelligent three-phase integration voltage instrument transformer - Google Patents
A kind of isolated neutral system intelligent three-phase integration voltage instrument transformer Download PDFInfo
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- CN204204625U CN204204625U CN201420640531.2U CN201420640531U CN204204625U CN 204204625 U CN204204625 U CN 204204625U CN 201420640531 U CN201420640531 U CN 201420640531U CN 204204625 U CN204204625 U CN 204204625U
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Abstract
The utility model discloses a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer, comprise pedestal, A phase resistance formula instrument transformer is provided with in described pedestal, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer and merge cells, above-mentioned A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer includes more than 3 divider resistances of mutually connecting, the primary voltage of high-pressure system is by A phase terminal, B phase terminal, C phase terminal accesses, after each divider resistance step-down of instrument transformer, form secondary voltage, secondary voltage is connected with merge cells after star-connection.Above-mentioned three-phase integratedization voltage transformer adopts three single-phase potential transformers and the integrated version of supporting merge cells, has the features such as anti-ferromagnetic resonance, light structure, the construction of adaptation intelligent grid.
Description
Technical field
The utility model relates to electric power system high-tension measurement or relay protection device, specifically a kind of isolated neutral system intelligence dry type three-phase integratedization voltage transformer of intelligent substation.
Background technology
Voltage transformer is the visual plant of measuring voltage in electric power system or electric control system, electric energy, but due to the distribution network more complicated of isolated neutral system, inductance, the capacitance parameter excursion of circuit are larger, when system earth fault, phase-to-ground voltage improves, easy generation ferro resonance, runs very harmful to voltage transformer, once voltage transformer blast and burnout failure often occurs.Current, through each side's effort of power technology personnel, find the method for employing 4 single-phase potential transformer star-connections, although, effectively reduce voltage transformer blast and burnout failure, but due to 4 voltage transformer star-connection more complicated, each side technical staff is different to the understanding of its wiring, and field personnel's mis-wired, voltage transformer blast and burnout failure still have generation, and due to its zero sequence wiring limitation, the residual voltage accuracy of instrument transformer is caused to decline, residual voltage is there is higher in actual motion, run unit is caused to adjust difficulty, the imperfection problems such as protection incorrect operation.Need to develop a kind of novel voltage mutual inductor for this reason, ensure instrument transformer safety, accurately run.
In addition, because its winding is more, capacity is comparatively large, there is device volume large in current voltage transformer, heavy, installs the problems such as cumbersome, needs a kind of small and exquisite, light, simple voltage transformer of exploitation.
Intelligent grid construction is carried out in China's electric power system comprehensively, and the voltage transformer that research is adapted to intelligent grid is imperative.Intelligent substation is owing to giving full play to network technology, and data sharing, the secondary capacity of voltage transformer is significantly declined, and intelligent secondary device has data reduction function, can reduce secondary winding quantity.Thus reduce the volume of instrument transformer, alleviate the weight of instrument transformer.
For this reason, in conjunction with the problems referred to above, the present inventor studies this, and develop a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer specially, this case produces thus.
Utility model content
In order to solve the problems such as instrument transformer mis-wired, adapt to the needs of intelligent grid development, the utility model provides a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer, adopt three single-phase potential transformers and the integrated version of supporting merge cells, there is the features such as anti-ferromagnetic resonance, light structure, the construction of adaptation intelligent grid.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of isolated neutral system intelligent three-phase integration voltage instrument transformer, comprise pedestal, A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer and merge cells is provided with in described pedestal, pedestal upper surface is provided with 4 the A phase terminals being respectively used to connect high-pressure system each phase line, B phase terminal, C phase terminal and 0 phase terminals, wherein, the bottom of described A phase terminal, B phase terminal, C phase terminal is connected with A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer respectively, and 0 phase terminal connects earth terminal; Above-mentioned A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer include more than 2 or 2 divider resistances of mutually connecting, the primary voltage of high-pressure system is by A phase terminal, B phase terminal, the access of C phase terminal, after each divider resistance step-down of instrument transformer, form secondary voltage, secondary voltage is connected with merge cells after star-connection.
As preferably, above-mentioned A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer include the divider resistances of 3 series connection mutually.
As preferably, above-mentioned merge cells comprises the first merge cells parallel with one another and the second merge cells, wherein, the power module that first merge cells and the second merge cells include analog-to-digital conversion module, computation analysis module, communication module and power for above-mentioned modules, computation analysis module is sent to after analog voltage is converted to digital signal by analog-to-digital conversion module by the secondary voltage of star-like connection, computation analysis module after merging and synchronously processing, then exports sampled data by communication module to intelligent electronic device.
As preferably, A phase terminal, B phase terminal, C phase terminal and 0 phase terminal are equipped with sleeve pipe, the top of sleeve pipe is provided with the embedded nut of sealing, for connecting the power line of high-pressure system.
As preferably, described pedestal adopts epoxide resin vacuum cast integrative-structure or epoxy resin and silicon rubber composite insulation integrative-structure.
As preferably, the lower end side of described pedestal is provided with one or two casees further, is mainly used in placing merge cells and drawing secondary connection, and secondary case is provided with secondary voltage calibrating terminal, secondary earth terminal, anti-interference earth terminal etc.
Above-mentioned isolated neutral system intelligent three-phase integration voltage instrument transformer operation principle: the primary voltage of high-pressure system is first by A phase terminal, B phase terminal, C phase terminal accesses, 0 phase terminal ground connection, primary voltage is after each divider resistance step-down of instrument transformer, form secondary voltage, secondary voltage adopts star-connection mode, then the analog-to-digital conversion module of merge cells is accessed, computation analysis module is sent to after the analog signal of secondary voltage being converted to digital signal by analog-to-digital conversion module, computation analysis module is after three-phase merges and synchronously processes, sampled data is exported to intelligent electronic device again by communication module, for measuring and protection high-pressure system.
The isolated neutral system intelligent three-phase integration voltage instrument transformer tool of said structure has the following advantages:
1. adopt resistance buck instrument transformer, do not need the components and parts such as the iron core of conventional voltage transformer, winding, effectively prevent from burning instrument transformer problem because core sataration, ferro resonance etc. cause on the one hand, really realize the function that product has anti-ferromagnetic resonance, the weight and volume of whole integration voltage instrument transformer can be reduced on the other hand, make product lighter;
2. adopt merge cells, by its computing capability, residual voltage is self-produced by merge cells, eliminates conventional voltage transformer zero sequence coil, and solves traditional four phase formula instrument transformers and bring the inaccurate problem of residual voltage data; And the principle of data sharing based on merge cells, instrument transformer secondary capacity only bears merge cells load, no longer needs to access a large amount of secondary devices, and other windings adopt little analog output, rated voltage is 4V, secondary capacity is minimum, adopts high-accuracy divider resistance step-down to extract, and does not need to transmit relatively high power by iron core, therefore reduce instrument transformer secondary voltage and capacity, can non-ferrous metal be reduced, reduce the cost, comparatively great society benefit can be produced.
3. easy-to-connect, reliable: adopt instrument transformer and merge cells batch production to complete integrated, there is not on-the-spot mis-wired problem, field connection is simple and reliable.
4. volume is little, flexible for installation: 3 single-phase potential transformers and merge cells are through adopting the one optimizing structure design of epoxy resin or silicon rubber composite insulation, and small product size is compact; Reduce secondary winding, reduce secondary capacity, more effectively reduce the volume and weight of instrument transformer, effectively reduce the space that equipment is installed, install more flexible.
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the three-phase integratedization voltage transformer front view of the present embodiment;
Fig. 2 is the three-phase integratedization voltage transformer cutaway view of the present embodiment;
Fig. 3 is the three-phase integratedization voltage transformer end view of the present embodiment;
Fig. 4 is the merge cells module frame chart of the present embodiment;
Fig. 5 is the three-phase integratedization voltage transformer electrical connection diagram of the present embodiment.
Embodiment
As shown in Figure 1-2, a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer, comprise pedestal 1, A phase resistance formula instrument transformer 2 is provided with in described pedestal 1, B phase resistance formula instrument transformer 3, C phase resistance formula instrument transformer 4 and merge cells, pedestal 1 upper surface is provided with the A phase terminal 21 that 4 are respectively used to connect each phase line of high-pressure system, B phase terminal 31, C phase terminal 41 and 0 phase terminal 7, wherein, described A phase terminal 21, B phase terminal 31, the bottom of C phase terminal 41 respectively with A phase resistance formula instrument transformer 2, B phase resistance formula instrument transformer 3, C phase resistance formula instrument transformer 4 is connected, 0 phase terminal 7 connects earth terminal, A phase terminal 21, B phase terminal 31, C phase terminal 41 and 0 phase terminal 7 are equipped with sleeve pipe 22, and the top of sleeve pipe 22 is provided with the embedded nut 23 of sealing, for connecting the power line of high-pressure system.In the present embodiment, described pedestal adopts epoxide resin vacuum cast integrative-structure.
As shown in Figure 3-4, in the present embodiment, the lower end side of described pedestal 1 is provided with one or two casees 8 further, is mainly used in placing merge cells and drawing secondary connection, secondary wiring terminals 83 comprises secondary voltage calibrating terminal, secondary earth terminal, anti-interference earth terminal etc.Secondary case 8 comprises casing 81 and the cover plate 82 of metal material, and is hermetically-sealed construction, and cover plate 82 has anti-electricity-theft lead sealing function.Secondary case 8 is generally installed in integration voltage instrument transformer bottom.Described merge cells comprises the first merge cells 5 and the second merge cells 6 parallel with one another, wherein, first merge cells 5 and the second merge cells 6 include the analog-to-digital conversion module 51, computation analysis module 52 and the communication module 53 that are connected successively, and the power module 54 of powering for above-mentioned modules.Adopt merge cells, by its computing capability, residual voltage is self-produced by merge cells, eliminates conventional voltage transformer zero sequence coil, and solves traditional four phase formula instrument transformers and bring the inaccurate problem of residual voltage data; And the principle of data sharing based on merge cells, instrument transformer secondary capacity only bears merge cells load, no longer needs to access a large amount of secondary devices, and other windings adopt little analog output, rated voltage is 4V, secondary capacity is minimum, adopts high-accuracy divider resistance step-down to extract, and does not need to transmit relatively high power by iron core, therefore reduce instrument transformer secondary voltage and capacity, can non-ferrous metal be reduced, reduce the cost, comparatively great society benefit can be produced.
As shown in Figure 5, in the present embodiment, described A phase resistance formula instrument transformer 2, B phase resistance formula instrument transformer 3, C phase resistance formula instrument transformer 4 include 3 divider resistance R1 ~ R3 mutually connected, and adopt short distance band shielded copper wire directly to connect, the number of divider resistance can regulate according to actual conditions, is generally more than 3 or 3.Above-mentioned a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer operation principle: the primary voltage of high-pressure system is first by A phase terminal 21, B phase terminal 31, C phase terminal 41 accesses, 0 phase terminal 7 ground connection, primary voltage is after 3 divider resistance R1 ~ R3 step-down of instrument transformer, form secondary voltage, secondary voltage adopts star-connection mode, then the analog-to-digital conversion module 51 of access in parallel first merge cells 5 and the second merge cells 6, computation analysis module 52 is sent to after the analog signal of secondary voltage being converted to digital signal by analog-to-digital conversion module 51, computation analysis module is after three-phase merges and synchronously processes, sampled data is exported to intelligent electronic device again by communication module 53, for measuring and protection high-pressure system.
Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field, to its suitable change done or modification, all should be considered as not departing from patent category of the present utility model.
Claims (6)
1. an isolated neutral system intelligent three-phase integration voltage instrument transformer, it is characterized in that: comprise pedestal, A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer and merge cells is provided with in described pedestal, pedestal upper surface is provided with 4 the A phase terminals being respectively used to connect high-pressure system each phase line, B phase terminal, C phase terminal and 0 phase terminals, wherein, the bottom of described A phase terminal, B phase terminal, C phase terminal is connected with A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer respectively, and 0 phase terminal connects earth terminal; Above-mentioned A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer include more than 2 or 2 divider resistances of mutually connecting, the primary voltage of high-pressure system is by A phase terminal, B phase terminal, the access of C phase terminal, after each divider resistance step-down of instrument transformer, form secondary voltage, secondary voltage is connected with merge cells after star-connection.
2. a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer as claimed in claim 1, is characterized in that: described A phase resistance formula instrument transformer, B phase resistance formula instrument transformer, C phase resistance formula instrument transformer include 3 divider resistances of mutually connecting.
3. a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer as claimed in claim 1, it is characterized in that: described merge cells comprises the first merge cells parallel with one another and the second merge cells, wherein, first merge cells and the second merge cells include analog-to-digital conversion module, computation analysis module, communication module and the power module of powering for above-mentioned modules, computation analysis module is sent to after analog voltage is converted to digital signal by analog-to-digital conversion module by the secondary voltage of star-like connection, computation analysis module is after merging and synchronously processing, sampled data is exported to intelligent electronic device again by communication module.
4. a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer as claimed in claim 1, it is characterized in that: described A phase terminal, B phase terminal, C phase terminal and 0 phase terminal are equipped with sleeve pipe, the top of sleeve pipe is provided with the embedded nut of sealing, for connecting the power line of high-pressure system.
5. a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer as claimed in claim 1, is characterized in that: described pedestal adopts epoxide resin vacuum cast integrative-structure or epoxy resin and silicon rubber composite insulation integrative-structure.
6. a kind of isolated neutral system intelligent three-phase integration voltage instrument transformer as claimed in claim 1, is characterized in that: the lower end side of described pedestal is provided with further for placing merge cells and drawing the secondary case of secondary connection.
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| CN201420640531.2U CN204204625U (en) | 2014-10-30 | 2014-10-30 | A kind of isolated neutral system intelligent three-phase integration voltage instrument transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332298A (en) * | 2014-10-30 | 2015-02-04 | 国家电网公司 | Intelligent three-phase integrated voltage transformer of un-grounded system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104332298A (en) * | 2014-10-30 | 2015-02-04 | 国家电网公司 | Intelligent three-phase integrated voltage transformer of un-grounded system |
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