CN202034778U - Device for realizing parallel secondary loop voltage of electronic voltage transformer - Google Patents
Device for realizing parallel secondary loop voltage of electronic voltage transformer Download PDFInfo
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- CN202034778U CN202034778U CN2011201022620U CN201120102262U CN202034778U CN 202034778 U CN202034778 U CN 202034778U CN 2011201022620 U CN2011201022620 U CN 2011201022620U CN 201120102262 U CN201120102262 U CN 201120102262U CN 202034778 U CN202034778 U CN 202034778U
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- amplifier
- load
- voltage transformer
- relay
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Abstract
The utility model provides a device for realizing parallel secondary loop voltage of an electronic voltage transformer, which comprises a first electronic voltage transformer, a second electronic voltage transformer, a first voltage following amplifier, a second voltage following amplifier and a middle connection branch, wherein the input end of the first voltage following amplifier is connected with the output end of the first electronic type voltage transformer, the output end of the first voltage following amplifier is connected with a first load, the input end of the second voltage following amplifier is connected with the output end of the second electronic voltage transformer, the output end of the second voltage following amplifier is connected with a second load, the middle connecting branch is connected between the output end of the first voltage following amplifier and the corresponding output end of the second voltage following amplifier, and the middle connecting branch comprises a shielding cable and a relay connected with the end part of the shielding cable. The device is favorable for solving the problem that the parallel connection mode of the secondary load in the prior art is not applicable to the secondary outlet loop of the electronic voltage transformer.
Description
Technical field
The utility model relates to the electric energy measurement field, relates in particular to a kind of electronic type voltage transformer secondary circuit voltage device arranged side by side of realizing.
Background technology
Often use traditional voltage transformer (for example electromagnetic potential transformer) in the transformer station and can make the secondary load of traditional voltage transformer parallel with one another as electric component, thereby realize that secondary circuit voltage is arranged side by side by operational example as air circuit.The secondary of traditional voltage transformer is output as high-power, high voltage signal, and the rated value of the secondary output of International or National standard is
And the rated power excursion of the secondary load that is connected with voltage transformer is generally 0VA～300VA, belongs to power-type forceful electric power category.When secondary load changed in its rated power excursion, traditional instrument transformer need not take anti-interference, anti-fading measure also can guarantee the precision of exporting.
The present electronic type voltage transformer of using particularly adopts the electronic type voltage transformer of voltage divider arrangement, and its secondary is output as small-power, low voltage signal, and the rated value of the secondary output of International or National standard is
Belong to low power analog small-signal category.Generally adopt the active voltage follow-up amplifier, so that the output of the electronic type voltage transformer of voltage divider arrangement can have been carried more secondary load at electronic type voltage transformer secondary load front end.Yet, because the low power analog small-signal is subject to disturb in signals transmission and decay, so can't as traditional voltage transformer, use traditional air circuit that electronic type voltage transformer is carried out the parallel operation of secondary output loop load, thereby restrict the practical ranges of electronic type voltage transformer.
The utility model content
The utility model aims to provide a kind of electronic type voltage transformer secondary circuit voltage device arranged side by side of realizing, is not suitable for the problem of the secondary output loop of electronic type voltage transformer in the mode of being connected in parallel that solves secondary load of the prior art.
To achieve these goals, the utility model provides a kind of electronic type voltage transformer secondary circuit voltage device arranged side by side of realizing, comprising: first electronic type voltage transformer; Second electronic type voltage transformer; First voltage follow-up amplifier, input is connected with the output of first electronic type voltage transformer, and output is connected with first load; Second voltage follow-up amplifier, input is connected with the output of second electronic type voltage transformer, and output is connected with second load; This device also comprises: the middle branch road that connects, be connected between the corresponding output of the output of first voltage follow-up amplifier and second voltage follow-up amplifier, middle connect branch road comprise shielded type cable and be connected cover first relay of an end of cable.
Further, the other end of shielded type cable is connected with second relay.
Further, device also comprises: the 3rd relay, the output that is connected in first voltage follow-up amplifier is connected between the branch road with middle.
Further, device also comprises: the 4th relay, the output that is connected in second voltage follow-up amplifier is connected between the branch road with middle.
Further, shielded type cable is a screened cable.
Further, shielded type cable is the screened cable of three-phase unification.
Further, first voltage follow-up amplifier and the 3rd relay are enclosed in the first metallic shield box, and second voltage follow-up amplifier and the 4th relay are enclosed in the second metallic shield box.
Further, be provided with between the output of first voltage follow-up amplifier and first load from recovering short-circuit protection circuit.
Further, be provided with between the output of second voltage follow-up amplifier and second load from recovering short-circuit protection circuit.
Use the technical solution of the utility model,, make signal in transmission course, have good jamproof effect by connecting the relay that uses screened cable and be connected the end of shielded type cable on the branch road in the centre.Simultaneously owing to use being connected in parallel between the relay control electronic type voltage transformer secondary circuit that is enclosed in the metallic shield box, suppressed signal attenuation effectively and improved antijamming capability, thereby the mode of being connected in parallel that helps solving secondary load of the prior art is not suitable for the problem on the secondary output loop of electronic type voltage transformer.
Except purpose described above, feature and advantage, the utility model also has other purpose, feature and advantage.With reference to figure, the utility model is described in further detail below.
Description of drawings
Accompanying drawing is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 shows the principle schematic according to the utility model embodiment one;
Fig. 2 shows the principle schematic according to the utility model embodiment two;
Fig. 3 shows the principle schematic according to the utility model embodiment three; And
Fig. 4 shows the principle schematic according to the utility model embodiment four.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
Fig. 1 shows the principle schematic according to the utility model embodiment one, realizes that wherein electronic type voltage transformer secondary circuit voltage device arranged side by side comprises: first electronic type voltage transformer 11; Second electronic type voltage transformer 12; First voltage follow-up amplifier 21, its input is connected with the output of first electronic type voltage transformer 11, and its output is connected with first load 31; Second voltage follow-up amplifier 22, its input is connected with the output of second electronic type voltage transformer 12, and its output is connected with second load 32; And the middle branch road that connects, it is connected between the corresponding output of the output of first voltage follow-up amplifier 21 and second voltage follow-up amplifier 22, middlely connects first relay 41 that branch road comprises shielded type cable 50 and is connected an end of shielded type cable 50.It will be understood by those skilled in the art that first relay 41 also can be connected the other end of shielded type cable 50, and can form, also can be a relay that connects three-phase simultaneously by three relays that are respectively applied for a phase.
After relay 41 closures, just first load 31 and second load, 32 parallel connections can be realized that promptly the secondary circuit of first electronic type voltage transformer 11 is in parallel with the voltage of the secondary circuit of second electronic type voltage transformer 12.Because relay can not make the simulation small-signal decay after voltage follow-up amplifier amplifies, thereby the secondary load that is connected with voltage follow-up amplifier is affected, thereby use the middle connection status that connects branch road of relay control, just can reduce the decay in the signals transmission.Simultaneously, because shielded type cable 50 has the effect of shielding outside electromagnetic interference, make that the simulation small-signal in transmission course has certain jamproof effect.Therefore, decay when having suppressed being connected in parallel between the electronic type voltage transformer secondary circuit has effectively also improved antijamming capability, thereby the mode of being connected in parallel that helps solving secondary load of the prior art is unsuitable for being applied in the problem on the secondary output loop of electronic type voltage transformer.
Because voltage transformer generally is used for being connected with AC power, so in the embodiment in figure 1, first voltage follow-up amplifier 21 and second voltage follow-up amplifier 22 are the three-phase active distributor, and its output is and three of AC power three corresponding splicing ears with input.Wherein, three splicing ears of input are connected with a corresponding output of voltage transformer respectively, and three splicing ears of its output are also distinguished the three-phase of corresponding AC power.
Also can be provided with relay 43 between first voltage follow-up amplifier 21 in the present embodiment and first load 31.Because the output at first voltage follow-up amplifier 21 is provided with relay 43 with corresponding middle the connection between the branch road; thereby in the time of can connecting branch road relay 41 in the centre and be in connected state; disconnect being connected of first voltage follow-up amplifier 21 and first load 31 by disconnecting relay 43, and then make first electronic type voltage transformer 11 and first voltage follow-up amplifier 21 obtain protection.
If present embodiment is applied to transformer station, then first electronic type voltage transformer 11, first voltage follow-up amplifier 21 and first load 31 form the main transformer loop, and second electronic type voltage transformer 12, second voltage follow-up amplifier 22 and second load 32 form back-up circuit.When working properly, main transformer loop and back-up circuit all are in connected state, and the various electric components on it all have load.When break down in the main transformer loop, still to work owing to be in first load 31 that being used on the main transformer loop measure, protect, so first load 31 need be parallel in second load 32 of back-up circuit.This is parallel to first load 31 in main transformer loop by closed first relay 41 in second load 32 of back-up circuit and realizes.In addition, also can disconnect the 3rd relay 43 cut off first load 31 with on become being connected of road first voltage follow-up amplifier 21 again.
Fig. 2 shows the principle schematic according to the utility model embodiment two.As shown in Figure 2, different with embodiment one is, present embodiment also is provided with the 4th relay 44 when in first loop that first electronic type voltage transformer 11, first voltage follow-up amplifier 21 and first load 31 form relay 43 being set in second loop that second electronic type voltage transformer 12, second voltage follow-up amplifier 22 and second load 32 form.
If the device in the present embodiment is applied to transformer station, then first electronic type voltage transformer 11, first voltage follow-up amplifier 21 and first load 31 form the main transformer loop, and second electronic type voltage transformer 12, second voltage follow-up amplifier 22 and second load 32 form back-up circuit.When break down in the main transformer loop, take the mode identical to operate with embodiment one, and when back-up circuit breaks down, second load 32 is parallel in first load 31 in main transformer loop earlier and disconnects back-up circuits by the 4th relay 44 again, so just can realize any switching between main transformer loop and the back-up circuit by first relay 41.It will be understood by those skilled in the art that in each embodiment of the present utility model, can select a loop arbitrarily as the main transformer loop, and with other loop as back-up circuit.
Fig. 3 shows the principle schematic according to the utility model embodiment three.Compare with embodiment shown in Figure 2, present embodiment has increased by second relay 42 on the other end of shielded type cable 50, and two ends that are about to every shielded type cable 50 are connected respectively to first relay 41 and second relay 42.Simultaneously, present embodiment also is serially connected shielded type cable 51 and shielded type cable 52 with shielded type cable 50.When having the 3rd load circuit, can the 3rd load circuit be connected to an end that is not connected of shielded type cable 51 or shielded type cable 52 by the relay (not shown) with shielded type cable 50, thereby similarly that the load circuit more than three is carried out voltage is arranged side by side for method, and then make secondary circuit load trend in parallel flexibly, connect branch road in the middle of this moment and comprise shielded type cable 50, shielded type cable 51 and shielded type cable 52.
Same, if the device in the present embodiment is applied to transformer station, then first electronic type voltage transformer 11, first voltage follow-up amplifier 21 and first load 31 form the main transformer loop, and second electronic type voltage transformer 12, second voltage follow-up amplifier 22 and second load 32 form back-up circuit.When there is fault in the main transformer loop owing to be in first load 31 that being used on the main transformer loop measure, protect and still will work, so need first load 31 be parallel in second load 32 of back-up circuit by transfer relay.Closed first relay 41 and second relay 42 are parallel to first load 31 in main transformer loop in second load 32 of back-up circuit earlier; Disconnect the 3rd relay 43 again and cut off being connected of first load 31 and main transformer loop first voltage follow-up amplifier 21.When back-up circuit has fault owing to be in second load 32 that being used on the back-up circuit measure, protect and still will work, so need second load 32 be parallel in first load 31 in main transformer loop by transfer relay.Closed first relay 41 of elder generation and second relay 42; second load 32 of back-up circuit is parallel in first load 31 in main transformer loop, disconnects the 4th relay 44 again and cut off being connected of second load 32 and back-up circuit second voltage follow-up amplifier 22 with the protection back-up circuit.When also having the 3rd load circuit, if all break down in two loops among Fig. 3, then earlier closed first relay 41, second relay 42 and the 3rd load relay (not shown) that is connected to shielded type cable of going the same way is parallel to the 3rd load (not shown) with first load 31, second load 32 disconnect the 3rd relay 43 and the 4th relay 44 again.
In the above-described embodiments, the employing relay can be realized the parallel connection between load, and simple to operate, manually wiring.Shielded type cable 50,51 and 52 all adopts screened cable can better play the effect of shielding outside electromagnetic interference.The middle screened cable that connects the unification of branch road employing three-phase connects the lead on the branch road in the middle of can reducing, improved interference free performance simultaneously.
Fig. 4 shows the principle schematic according to the utility model embodiment four, wherein compare with embodiment shown in Figure 3, first voltage follow-up amplifier 21 and the 3rd relay 43 are enclosed in the first metallic shield box 61, and second voltage follow-up amplifier 22 and the 4th relay 44 are enclosed in the second metallic shield box 62.Can reduce the interference of outer bound pair signal source like this, guarantee that to the full extent the output of electronic type voltage transformer secondary singal is not subjected to ectocine.Simultaneously, by being arranged at the special purpose interface on the shielding box, each metallic shield box can be expanded the loop quantity of secondary load neatly as a module, satisfy the actual needs that use.In addition, in the above-described embodiments, the output of first voltage follow- up amplifier 21 and 31 of first loads are provided with from recovering short-circuit protection circuit, and the output of second voltage follow- up amplifier 22 and 32 of second loads are provided with from recovering short-circuit protection circuit.When the load of an output loop is short-circuited arbitrarily, can not influence the output in other loop.It will be appreciated by those skilled in the art that; as long as can play shielding and jamproof effect; first relay 41, second relay 42 and recover short-circuit protection circuit certainly and also can be installed in the corresponding metal shielding box, and a plurality of voltage follow-up amplifier also can be installed in the metallic shield box.
From above description, as can be seen, the utility model the above embodiments have realized following technique effect: use screened cable on the branch road and be enclosed in relay in the metallic shield box by connecting in the centre, signal has good anti-interference effect in transmission course.Simultaneously; owing to use being connected in parallel between relay control electronic type voltage transformer secondary circuit; simple to operate; manually wiring; and owing to have from recovering short-circuit protection circuit; even the secondary load short circuit of a certain loop takes place, can not influence the normal operation of instrument transformer output accuracy and other secondary device yet, guaranteed substation safety, reliability service.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (9)
1. realize electronic type voltage transformer secondary circuit voltage device arranged side by side for one kind, comprising:
First electronic type voltage transformer (11);
Second electronic type voltage transformer (12);
First voltage follow-up amplifier (21), input is connected with the output of described first electronic type voltage transformer (11), and output is connected with first load (31);
Second voltage follow-up amplifier (22), input is connected with the output of described second electronic type voltage transformer (12), and output is connected with second load (32);
It is characterized in that described device also comprises:
The middle branch road that connects, be connected between the corresponding output of the output of described first voltage follow-up amplifier (21) and described second voltage follow-up amplifier (22), connect first relay (41) that branch road comprises shielded type cable (50) and is connected an end of described shielded type cable (50) in the middle of described.
2. realization electronic type voltage transformer secondary circuit voltage according to claim 1 device arranged side by side is characterized in that the other end of described shielded type cable (50) is connected with second relay (42).
3. realization electronic type voltage transformer secondary circuit voltage according to claim 1 and 2 device arranged side by side, it is characterized in that, described device also comprises: the 3rd relay (43), the output and the described centre that are connected in described first voltage follow-up amplifier (21) are connected between the branch road.
4. realization electronic type voltage transformer secondary circuit voltage according to claim 3 device arranged side by side, it is characterized in that, described device also comprises: the 4th relay (44), the output and the described centre that are connected in described second voltage follow-up amplifier (22) are connected between the branch road.
5. realization electronic type voltage transformer secondary circuit voltage according to claim 4 device arranged side by side is characterized in that described shielded type cable (50) is a screened cable.
6. realization electronic type voltage transformer secondary circuit voltage according to claim 4 device arranged side by side is characterized in that, described shielded type cable (50) is the screened cable of three-phase unification.
7. realization electronic type voltage transformer secondary circuit voltage according to claim 6 device arranged side by side, it is characterized in that, described first voltage follow-up amplifier (21) and described the 3rd relay (43) are enclosed in the first metallic shield box (61), and described second voltage follow-up amplifier (22) and described the 4th relay (44) are enclosed in the second metallic shield box (62).
8. realization electronic type voltage transformer secondary circuit voltage according to claim 7 device arranged side by side is characterized in that, is provided with between the output of described first voltage follow-up amplifier (21) and described first load (31) from recovering short-circuit protection circuit.
9. realization electronic type voltage transformer secondary circuit voltage according to claim 8 device arranged side by side is characterized in that, is provided with between the output of described second voltage follow-up amplifier (22) and described second load (32) from recovering short-circuit protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201022620U CN202034778U (en) | 2011-04-08 | 2011-04-08 | Device for realizing parallel secondary loop voltage of electronic voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201022620U CN202034778U (en) | 2011-04-08 | 2011-04-08 | Device for realizing parallel secondary loop voltage of electronic voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202034778U true CN202034778U (en) | 2011-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201022620U Expired - Lifetime CN202034778U (en) | 2011-04-08 | 2011-04-08 | Device for realizing parallel secondary loop voltage of electronic voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202034778U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738787A (en) * | 2011-04-08 | 2012-10-17 | 上海电力设计院有限公司 | Device for implementing voltage juxtaposition on secondary circuit of electronic voltage transformer |
-
2011
- 2011-04-08 CN CN2011201022620U patent/CN202034778U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738787A (en) * | 2011-04-08 | 2012-10-17 | 上海电力设计院有限公司 | Device for implementing voltage juxtaposition on secondary circuit of electronic voltage transformer |
| CN102738787B (en) * | 2011-04-08 | 2015-12-09 | 上海电力设计院有限公司 | Realize the device of parallel secondary loop voltage of electronic voltage transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111109 Effective date of abandoning: 20151209 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |