CN102738787B - Realize the device of parallel secondary loop voltage of electronic voltage transformer - Google Patents

Realize the device of parallel secondary loop voltage of electronic voltage transformer Download PDF

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Publication number
CN102738787B
CN102738787B CN201110088963.8A CN201110088963A CN102738787B CN 102738787 B CN102738787 B CN 102738787B CN 201110088963 A CN201110088963 A CN 201110088963A CN 102738787 B CN102738787 B CN 102738787B
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voltage
amplifier
output
load
voltage transformer
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CN201110088963.8A
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CN102738787A (en
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陈文升
马文豪
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Legend electric (Shenyang) Limited
Shanghai Electric Power Design Institute Co Ltd
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TRENCH CHINA MWB (SHANGHAI) CO Ltd
Shanghai Electric Power Design Institute Co Ltd
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Abstract

The invention provides a kind of device realizing parallel secondary loop voltage of electronic voltage transformer, comprising: the first electronic type voltage transformer; Second electronic type voltage transformer; First voltage follow-up amplifier, input is connected with the output of the first electronic type voltage transformer, and output is connected with the first load; Second voltage follow-up amplifier, input is connected with the output of the second electronic type voltage transformer, and output is connected with the second load; This device also comprises: middle connect branch road, is connected between the output of the first voltage follow-up amplifier and the corresponding output of the second voltage follow-up amplifier, and the middle branch road that connects comprises shielded type cable and is connected to the relay of end of shielded type cable.The parallel that the present invention is conducive to 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.

Description

Realize the device of parallel secondary loop voltage of electronic voltage transformer
Technical field
The present invention relates to electric energy measurement field, particularly relate to a kind of device realizing parallel secondary loop voltage of electronic voltage transformer.
Background technology
Often in transformer station use traditional voltage transformer (such as electromagnetic potential transformer) and by operational example as made the secondary load of traditional voltage transformer parallel with one another for the electric component of air circuit, thus it is arranged side by side to realize secondary circuit voltage.The secondary of traditional voltage transformer exports as high-power, high voltage signal, and the rated value that the secondary of International or National standard exports is and the rated power excursion of the secondary load be connected with voltage transformer is generally 0VA ~ 300VA, belong to power-type forceful electric power category.When secondary load changes in its rated power excursion, traditional instrument transformer need not take anti-interference, anti-fading measure also can ensure the precision exported.
The electronic type voltage transformer of current application, particularly adopts the electronic type voltage transformer of voltage divider arrangement, and its secondary exports as small-power, low voltage signal, and the rated value that the secondary of International or National standard exports is belong to low power analog small-signal category.Generally adopt active voltage follow-up amplifier in electronic type voltage transformer secondary load front end, more secondary load can have been carried to make the output of the electronic type voltage transformer of voltage divider arrangement.But, easily be disturbed in signals transmission due to low power analog small-signal and decay, therefore cannot as traditional voltage transformer, use traditional air circuit to carry out the parallel operation of secondary output loop load to electronic type voltage transformer, thus constrain the practical ranges of electronic type voltage transformer.
Summary of the invention
The present invention aims to provide a kind of device realizing parallel secondary loop voltage of electronic voltage transformer, is not suitable for the problem of the secondary output loop of electronic type voltage transformer with the parallel solving secondary load of the prior art.
To achieve these goals, the invention provides a kind of device realizing parallel secondary loop voltage of electronic voltage transformer, comprising: the first electronic type voltage transformer; Second electronic type voltage transformer; First voltage follow-up amplifier, input is connected with the output of the first electronic type voltage transformer, and output is connected with the first load; Second voltage follow-up amplifier, input is connected with the output of the second electronic type voltage transformer, and output is connected with the second load; This device also comprises: middle connection branch road, be connected between the output of the first voltage follow-up amplifier and the corresponding output of the second voltage follow-up amplifier, the middle branch road that connects comprises shielded type cable and is connected to first relay of an end of shielded type cable.
Further, the other end of shielded type cable is connected with the second relay.
Further, device also comprises: the 3rd relay, and the output being connected to the first voltage follow-up amplifier is connected between branch road with centre.
Further, device also comprises: the 4th relay, and the output being connected to the second voltage follow-up amplifier is connected between branch road with centre.
Further, shielded type cable is screened cable.
Further, shielded type cable is the screened cable of three-phase unification.
Further, the first voltage follow-up amplifier and the 3rd relay are enclosed in the first metal shielding box, and the second voltage follow-up amplifier and the 4th relay are enclosed in the second metal shielding box.
Further, self-recoverage short-circuit protection circuit is provided with between the output of the first voltage follow-up amplifier and the first load.
Further, self-recoverage short-circuit protection circuit is provided with between the output of the second voltage follow-up amplifier and the second load.
Apply technical scheme of the present invention, by connecting the relay of end branch road using screened cable and be connected to shielded type cable in centre, make signal in transmitting procedure, have good jamproof effect.Be enclosed in being connected in parallel between the Control electronic type voltage transformer secondary circuit in metal shielding box due to use simultaneously, restrained effectively signal attenuation and improve antijamming capability, thus the parallel being conducive to solving secondary load of the prior art is not suitable for the problem on the secondary output loop of electronic type voltage transformer.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the principle schematic according to the embodiment of the present invention one;
Fig. 2 shows the principle schematic according to the embodiment of the present invention two;
Fig. 3 shows the principle schematic according to the embodiment of the present invention three; And
Fig. 4 shows the principle schematic according to the embodiment of the present invention four.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Fig. 1 shows the principle schematic according to the embodiment of the present invention one, and the device wherein realizing parallel secondary loop voltage of electronic voltage transformer comprises: the 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 the first electronic type voltage transformer 11, and its output is connected with the first load 31; Second voltage follow-up amplifier 22, its input is connected with the output of the second electronic type voltage transformer 12, and its output is connected with the second load 32; And middle connection branch road, it is connected between the output of the first voltage follow-up amplifier 21 and the corresponding output of the second voltage follow-up amplifier 22, and the middle branch road that connects comprises shielded type cable 50 and is connected to first relay 41 of an end of shielded type cable 50.It will be understood by those skilled in the art that the first relay 41 also can be connected to the other end of shielded type cable 50, and can be made up of three relays being respectively used to a phase, also can be a relay simultaneously connecting three-phase.
After relay 41 is closed, just by the first load 31 and the second load 32 parallel connection, can namely realize the voltage parallel of the secondary circuit of the first electronic type voltage transformer 11 and the secondary circuit of the second electronic type voltage transformer 12.Because relay can not make the simulation small-signal decay after voltage follow-up amplifier amplifies, thus the secondary load be connected with voltage follow-up amplifier can not be made to be affected, thus use the connection status connecting branch road in the middle of Control, just can reduce the decay in signals transmission.Meanwhile, because shielded type cable 50 has the effect of shielding outside electromagnetic interference, the simulation small-signal in transmitting procedure is made to have certain jamproof effect.Therefore, decay when restrained effectively being connected in parallel between electronic type voltage transformer secondary circuit also improves antijamming capability, thus the parallel being conducive to 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.
Be connected with AC power because voltage transformer is generally used for, therefore in the embodiment in figure 1, first voltage follow-up amplifier 21 and the second voltage follow-up amplifier 22 are three-phase active distributor, and its output and input are three splicing ears corresponding with three of AC power.Wherein, the output that three splicing ears of input are corresponding with of voltage transformer respectively connects, and the three-phase of three of its output splicing ears also corresponding AC power respectively.
Also relay 43 can be provided with between the first voltage follow-up amplifier 21 in the present embodiment and the first load 31.Because the output at the first voltage follow-up amplifier 21 is provided with relay 43 with corresponding middle connection between branch road; thus branch road relay 41 can be connected in centre when being in connected state; disconnect the connection of the first voltage follow-up amplifier 21 and the first load 31 by disconnecting relay 43, and then make the first electronic type voltage transformer 11 and the first voltage follow-up amplifier 21 obtain protection.
If the present embodiment is applied to transformer station, then the first electronic type voltage transformer 11, first voltage follow-up amplifier 21 and the first load 31 form main transformer loop, and the second electronic type voltage transformer 12, second voltage follow-up amplifier 22 and the second load 32 form back-up circuit.When time working properly, main transformer loop and back-up circuit are all in connected state, and the various electric components on it all have load.When breaking down in main transformer loop, owing to being in still will work for first load 31 of measuring, protecting on main transformer loop, therefore need the first load 31 to be parallel in the second load 32 of back-up circuit.This is parallel to first load 31 in main transformer loop in the second load 32 of back-up circuit by closed first relay 41 and realizes.In addition, the connection that the 3rd relay 43 cuts off the first load 31 and main transformer loop first voltage follow-up amplifier 21 can also be disconnected.
Fig. 2 shows the principle schematic according to the embodiment of the present invention two.As shown in Figure 2, with embodiment one unlike, while the present embodiment arranges relay 43 in the first loop that the first electronic type voltage transformer 11, first voltage follow-up amplifier 21 and the first load 31 are formed, in the second servo loop also formed at the second electronic type voltage transformer 12, second voltage follow-up amplifier 22 and the second load 32, the 4th relay 44 is set.
If by the application of installation in the present embodiment in transformer station, then the first electronic type voltage transformer 11, first voltage follow-up amplifier 21 and the first load 31 form main transformer loop, and the second electronic type voltage transformer 12, second voltage follow-up amplifier 22 and the second load 32 form back-up circuit.When breaking down in main transformer loop, the mode identical with embodiment one is taked to operate, and when back-up circuit breaks down, the first load 31 first by the first relay 41 second load 32 being parallel to main transformer loop disconnects back-up circuit by the 4th relay 44 again, so just can realize any switching laws between main transformer loop and back-up circuit.It will be understood by those skilled in the art that in various embodiments of the present invention, a loop can be selected arbitrarily as main transformer loop, and using other loop as back-up circuit.
Fig. 3 shows the principle schematic according to the embodiment of the present invention three.Compared with the embodiment shown in Fig. 2, the present embodiment adds the second relay 42 on the other end of shielded type cable 50, and two ends by every bar shielded type cable 50 are connected respectively to the first relay 41 and the second relay 42.Meanwhile, shielded type cable 51 and shielded type cable 52 are also serially connected with shielded type cable 50 by the present embodiment.When having the 3rd load circuit, by relay (not shown), the 3rd load circuit can be connected to one end be not connected with shielded type cable 50 of shielded type cable 51 or shielded type cable 52, thus it is arranged side by side to carry out voltage to the load circuit of more than three in a similar manner, and then make secondary circuit load parallel connection trend flexibly, connect branch road now and comprise shielded type cable 50, shielded type cable 51 and shielded type cable 52.
Same, if the application of installation in the present embodiment is in transformer station, then the first electronic type voltage transformer 11, first voltage follow-up amplifier 21 and the first load 31 form main transformer loop, and the second electronic type voltage transformer 12, second voltage follow-up amplifier 22 and the second load 32 form back-up circuit.Owing to being in still will work for first load 31 of measuring, protecting on main transformer loop when having a fault in main transformer loop, therefore need by transfer relay, the first load 31 to be parallel in the second load 32 of back-up circuit.First closed first relay 41 and the second relay 42, is parallel to first load 31 in main transformer loop in the second load 32 of back-up circuit; Disconnect the connection that the 3rd relay 43 cuts off the first load 31 and main transformer loop first voltage follow-up amplifier 21 again.When back-up circuit has fault owing to being in still will work for second load 32 of measuring, protecting on back-up circuit, therefore need by transfer relay, the second load 32 to be parallel in first load 31 in main transformer loop.First closed first relay 41 and the second relay 42; second load 32 of back-up circuit is parallel in first load 31 in main transformer loop, then disconnects the 4th relay 44 and cut off the connection of the second load 32 and back-up circuit second voltage follow-up amplifier 22 to protect back-up circuit.When also having the 3rd load circuit, if all break down in two loops in Fig. 3, then first the first load 31, second load 32 is parallel to the 3rd load (not shown) by closed first relay 41, second relay 42 and the relay (not shown) that the 3rd load circuit is connected to shielded type cable, then disconnects the 3rd relay 43 and the 4th relay 44.
In the above-described embodiments, employing relay can realize the parallel connection between load, and simple to operate, need not manually wiring.Shielded type cable 50,51 and 52 all adopts screened cable better can play the effect of shielding outside electromagnetic interference.The middle screened cable connecting branch road and adopt three-phase to unify, can reduce the middle wire connected on branch road, improve interference free performance simultaneously.
Fig. 4 shows the principle schematic according to the embodiment of the present invention four, wherein compared with the embodiment shown in Fig. 3, first voltage follow-up amplifier 21 and the 3rd relay 43 are enclosed in the first metal shielding box 61, and the second voltage follow-up amplifier 22 and the 4th relay 44 are enclosed in the second metal shielding box 62.The interference of outer bound pair signal source can be reduced like this, ensure that the output of electronic type voltage transformer secondary singal is not by ectocine to the full extent.Meanwhile, by being arranged at the special purpose interface on shielding box, each metal shielding box can be expanded neatly the loop quantity of secondary load as a module, meeting the actual needs used.In addition, in the above-described embodiments, between the output of the first voltage follow-up amplifier 21 and the first load 31, be provided with self-recoverage short-circuit protection circuit, between the output of the second voltage follow-up amplifier 22 and the second load 32, be provided with self-recoverage short-circuit protection circuit.When the load of an arbitrary output loop is short-circuited, the output in other loop all can not be affected.It will be appreciated by those skilled in the art that; as long as shielding and jamproof effect can be played; first relay 41, second relay 42 and self-recoverage short-circuit protection circuit also can be arranged in corresponding metal shielding box, and multiple voltage follow-up amplifier also can be arranged in a metal shielding box.
From above description, can find out, the above embodiments of the present invention achieve following technique effect: use screened cable by connecting on branch road in centre and be enclosed in the relay in metal shielding box, signal has good anti-jamming effectiveness in transmitting procedure.Simultaneously; owing to using being connected in parallel between Control electronic type voltage transformer secondary circuit; simple to operate; need not manually wiring; and owing to having self-recoverage short-circuit protection circuit; even if there is certain primary Ioops secondary load short circuit, also can not affect the normal operation of instrument transformer output accuracy and other secondary device, ensure that substation safety, reliability service.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. realize a device for parallel secondary loop voltage of electronic voltage transformer, 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 the 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 the second load (32);
It is characterized in that, described device also comprises:
Middle connection branch road, be connected between the output of described first voltage follow-up amplifier (21) and the corresponding output of described second voltage follow-up amplifier (22), connect branch road in the middle of described and comprise shielded type cable (50) and be connected to first relay (41) of an end of described shielded type cable (50).
2. the device realizing parallel secondary loop voltage of electronic voltage transformer according to claim 1, is characterized in that, the other end of described shielded type cable (50) is connected with the second relay (42).
3. the device realizing parallel secondary loop voltage of electronic voltage transformer according to claim 1 and 2, it is characterized in that, described device also comprises: the 3rd relay (43), and the output being connected to described first voltage follow-up amplifier (21) is connected between branch road with described centre.
4. the device realizing parallel secondary loop voltage of electronic voltage transformer according to claim 3, it is characterized in that, described device also comprises: the 4th relay (44), and the output being connected to described second voltage follow-up amplifier (22) is connected between branch road with described centre.
5. the device realizing parallel secondary loop voltage of electronic voltage transformer according to claim 4, is characterized in that, described shielded type cable (50) is screened cable.
6. the device realizing parallel secondary loop voltage of electronic voltage transformer according to claim 4, is characterized in that, the screened cable that described shielded type cable (50) is unified for three-phase.
7. the device realizing parallel secondary loop voltage of electronic voltage transformer according to claim 6, it is characterized in that, described first voltage follow-up amplifier (21) and described 3rd relay (43) are enclosed in the first metal shielding box (61), and described second voltage follow-up amplifier (22) and described 4th relay (44) are enclosed in the second metal shielding box (62).
8. the device realizing parallel secondary loop voltage of electronic voltage transformer according to claim 7; it is characterized in that, between the output of described first voltage follow-up amplifier (21) and described first load (31), be provided with self-recoverage short-circuit protection circuit.
9. the device realizing parallel secondary loop voltage of electronic voltage transformer according to claim 8; it is characterized in that, between the output of described second voltage follow-up amplifier (22) and described second load (32), be provided with self-recoverage short-circuit protection circuit.
CN201110088963.8A 2011-04-08 2011-04-08 Realize the device of parallel secondary loop voltage of electronic voltage transformer Active CN102738787B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2901529Y (en) * 2006-04-07 2007-05-16 西华大学 Electronic voltage mutual inductor
CN201302591Y (en) * 2008-10-20 2009-09-02 华北电力大学(保定) Over-voltage online monitoring device
CN201628855U (en) * 2009-12-06 2010-11-10 山西方盛液压机电设备有限公司 Electronic pressure relay
CN202034778U (en) * 2011-04-08 2011-11-09 上海电力设计院有限公司 Device for realizing parallel secondary loop voltage of electronic voltage transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2901529Y (en) * 2006-04-07 2007-05-16 西华大学 Electronic voltage mutual inductor
CN201302591Y (en) * 2008-10-20 2009-09-02 华北电力大学(保定) Over-voltage online monitoring device
CN201628855U (en) * 2009-12-06 2010-11-10 山西方盛液压机电设备有限公司 Electronic pressure relay
CN202034778U (en) * 2011-04-08 2011-11-09 上海电力设计院有限公司 Device for realizing parallel secondary loop voltage of electronic voltage transformer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PT自动并列装置在运行中存在的问题及改进措施;赵希斌等;《江西电力》;20100331;第34卷(第3期);第43-45页 *

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Effective date of registration: 20170517

Address after: 200025 No. 310 South Chongqing Road, Shanghai

Co-patentee after: Legend electric (Shenyang) Limited

Patentee after: Shanghai Electric Power Design Institute Limited

Address before: 200025 No. 310 South Chongqing Road, Shanghai

Co-patentee before: Trench China MWB (Shanghai) Co., Ltd.

Patentee before: Shanghai Electric Power Design Institute Limited