CN103278672A - Signal acquisition circuit used in distribution transformer remote monitoring system - Google Patents
Signal acquisition circuit used in distribution transformer remote monitoring system Download PDFInfo
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- CN103278672A CN103278672A CN2013102373219A CN201310237321A CN103278672A CN 103278672 A CN103278672 A CN 103278672A CN 2013102373219 A CN2013102373219 A CN 2013102373219A CN 201310237321 A CN201310237321 A CN 201310237321A CN 103278672 A CN103278672 A CN 103278672A
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Abstract
The invention discloses a signal acquisition circuit used in a distribution transformer remote monitoring system. The signal acquisition circuit used in the distribution transformer remote monitoring system comprises a first resistor, a second resistor, a first capacitor, a second capacitor, a current transformer, a first operational amplifier and an acquired signal output line, wherein the two output ends of the current transformer are connected with a same-phase input end of the first operational amplifier and an anti-phase input end of the first operational amplifier respectively, the first capacitor and the second capacitor are connected in parallel to form a parallel sub-circuit, and the two ends of the parallel sub-circuit are connected with the anti-phase input end of the first operational amplifier and an output end of the first operational amplifier respectively. One end of the first resistor is connected with the acquired signal output line, and the other end of first resistor is connected with the output end of the first operational amplifier. One end of the second capacitor is connected to the circuit between the output end of the first operational amplifier and the first resistor, and the other end of the second capacitor is connected to the ground. The signal acquisition circuit used in the distribution transformer remote monitoring system is few in used element and low in cost, when the signal acquisition circuit used in the distribution transformer remote monitoring system is applied, an acquired large current can be adjusted to a small voltage signal through adjustment of the second resistor, and the operation is convenient and rapid to conduct.
Description
Technical field
The present invention relates to the backup system of substation transformer, specifically is the signal acquisition circuit for the substation transformer long distance control system.
Background technology
Along with industrial expansion, all trades and professions improve day by day to the power supply reliability of electric system and the requirement of stability, substation transformer is as the core link of electric system, and it is the power equipment of electric energy directly being distributed to low-voltage customer, and its service data is the basic data of whole power distribution network.Therefore, the safe operation of substation transformer is most important to electric system.For substation transformer is monitored, existing distribution power transformation device generally is equipped with the supervisory system based on radio communication, and supervisory system is usually come analyzing and processing by the current signal of gathering substation transformer, and then realizes the remote monitoring to distribution power transformation device.Wherein, the signal of the distribution power transformation device that collects is big current signal, and the controller of monitor terminal generally can only be handled the small voltage signal in the supervisory system, and the big current signal that therefore needs sensor is collected changes into the small voltage signal.Designed circuit structure complexity when the supervisory system of existing substation transformer changes into small voltage with big electric current uses element more, the cost height, and it is loaded down with trivial details that big current signal is adjusted to the small voltage process of supervisory system middle controller demand.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of signal acquisition circuit for the substation transformer long distance control system is provided, it uses element few, and cost is low, is convenient to debugging, and then easy to utilize.
Purpose of the present invention is achieved through the following technical solutions: the signal acquisition circuit that is used for the substation transformer long distance control system, comprise first resistance, second resistance, first electric capacity, second electric capacity, current transformer, first operational amplifier and gather the output line road, two output terminals of described current transformer are connected with inverting input with the in-phase input end of first operational amplifier respectively, and the parallel branch two ends that constitute after described first electric capacity and the second resistance parallel connection are connected with output terminal with the inverting input of first operational amplifier respectively; Described first resistance, one end is connected with collection output line road, and its other end is connected with first operational amplifier output terminal; Described second electric capacity, one end is connected on the circuit between first operational amplifier output terminal and first resistance, its other end ground connection.When the present invention used, current transformer carried out the current signal collection, gathered the signal output after the output line road is used for changing.
Described first operational amplifier is connected with power supply.
The signal acquisition circuit that is used for the substation transformer long distance control system, comprise that also transient voltage suppresses diode, described transient voltage suppresses diode one end and is connected on the circuit between current transformer output terminal and the first operational amplifier in-phase input end, and its other end is connected on the circuit between current transformer output terminal and the first operational amplifier inverting input.Wherein, transient voltage suppresses the glitch that diode can suppress voltage or electric current, prevent the unexpected rising of voltage and current, when transient voltage inhibition diode stands high energy impact events, it can make its impedance reduce suddenly with high speed, absorb a big electric current simultaneously, with the voltage clamp between its two ends on a predetermined numerical value, thereby the circuit component of guaranteeing the back is subjected to the high-octane impact of transient state and damages.
For the ease of the resistance of second resistance is regulated, as preferably, described second resistance is adjustable resistance.
Compared with prior art, the present invention has following beneficial effect: (1) the present invention includes first resistance, second resistance, first electric capacity, second electric capacity, current transformer and first operational amplifier, the present invention uses element few, cost is low, is convenient to realize, when the present invention uses, can obtain needed voltage output by the resistance of regulating second resistance, debugging is convenient, so, is convenient to of the present invention applying.
(2) the present invention includes first electric capacity and second electric capacity, when the present invention used, first electric capacity and second electric capacity were used for uncoupling and filtering, and then can improve the stability of gathering output line road output signal.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
The corresponding name of Reference numeral is called in the accompanying drawing: 1, current transformer, 2, gather output line road, R1, first resistance, R2, second resistance, C1, first electric capacity, C2, second electric capacity, D1, transient voltage suppress diode, A1, first operational amplifier, VCC, power supply.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, the signal acquisition circuit that is used for the substation transformer long distance control system, comprise that first resistance R 1, second resistance R 2, first capacitor C 1, second capacitor C 2, current transformer 1, first operational amplifier A 1 and transient voltage suppress diode D1, wherein, an output terminal of current transformer 1 secondary is connected with the in-phase input end of first operational amplifier A 1, and another output terminal of current transformer 1 secondary is connected with the inverting input of first operational amplifier A 1.First operational amplifier A 1 is connected with power supply VCC, and first operational amplifier A 1 also is provided with earth terminal.First capacitor C 1 is connected with output terminal with the inverting input of first operational amplifier A 1 respectively with the parallel branch two ends that second resistance R, 2 backs in parallel constitute, first resistance R, 1 one ends are connected with first operational amplifier A, 1 output terminal, and its other end is connected with gathers output line road 2.Second capacitor C, 2 one ends are connected on the circuit between first operational amplifier A, 1 output terminal and first resistance R 1, its other end ground connection.
Transient voltage suppresses diode D1 one end and is connected on the circuit between current transformer 1 output terminal and first operational amplifier A, 1 in-phase input end, and its other end is connected on the circuit between current transformer 1 output terminal and first operational amplifier A, 1 inverting input.When being used, present embodiment regulates control, second resistance R, the 2 preferred adjustable resistances that adopt in the present embodiment.
When present embodiment was used, the former limit of current transformer 1 was connected with substation transformer and is used for gathering current signal, can obtain needed voltage output by the resistance of regulating second resistance R 2, and the signal after conversion is through gathering 2 outputs of output line road.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention does, can not assert that the specific embodiment of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, not breaking away from other embodiments that draw under the technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (4)
1. the signal acquisition circuit that is used for the substation transformer long distance control system, it is characterized in that: comprise first resistance (R1), second resistance (R2), first electric capacity (C1), second electric capacity (C2), current transformer (1), first operational amplifier (A1) and collection output line road (2), two output terminals of described current transformer (1) are connected with inverting input with the in-phase input end of first operational amplifier (A1) respectively, and described first electric capacity (C1) is connected with output terminal with the inverting input of first operational amplifier (A1) respectively with the parallel branch two ends that second resistance (R2) back in parallel constitutes; Described first resistance (R1) end is connected with collection output line road (2), and its other end is connected with first operational amplifier (A1) output terminal; Described second electric capacity (C2) end is connected on the circuit between first operational amplifier (A1) output terminal and first resistance (R1), its other end ground connection.
2. the signal acquisition circuit for the substation transformer long distance control system according to claim 1, it is characterized in that: described first operational amplifier (A1) is connected with power supply (VCC).
3. the signal acquisition circuit for the substation transformer long distance control system according to claim 1, it is characterized in that: comprise that also transient voltage suppresses diode (D1), described transient voltage suppresses diode (D1) end and is connected on the circuit between current transformer (1) output terminal and first operational amplifier (A1) in-phase input end, and its other end is connected on the circuit between current transformer (1) output terminal and first operational amplifier (A1) inverting input.
4. according to any described signal acquisition circuit for the substation transformer long distance control system in the claim 1～3, it is characterized in that: described second resistance (R2) is adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102373219A CN103278672A (en) | 2013-06-17 | 2013-06-17 | Signal acquisition circuit used in distribution transformer remote monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102373219A CN103278672A (en) | 2013-06-17 | 2013-06-17 | Signal acquisition circuit used in distribution transformer remote monitoring system |
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| CN103278672A true CN103278672A (en) | 2013-09-04 |
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| CN2013102373219A Pending CN103278672A (en) | 2013-06-17 | 2013-06-17 | Signal acquisition circuit used in distribution transformer remote monitoring system |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051739A (en) * | 2007-04-13 | 2007-10-10 | 清华大学 | Digital current synthesizer |
| CN101551440A (en) * | 2009-05-15 | 2009-10-07 | 东北大学 | Generator transformer unit faults recorder analysis device |
| CN201378741Y (en) * | 2009-04-24 | 2010-01-06 | 王占武 | Reactive power compensation filtering controller |
| CN101771296A (en) * | 2010-02-05 | 2010-07-07 | 东北大学 | Method and device for power information detection and interconnection self-decision analysis |
| CN201726320U (en) * | 2010-05-28 | 2011-01-26 | 天津诺尔哈顿电器制造有限公司 | Precision rectifier circuit |
| CN102079009A (en) * | 2010-12-30 | 2011-06-01 | 哈尔滨工业大学 | Device for monitoring positive and negative half-wave asymmetry of primary current of transformer in resistance welding machine |
| CN102621367A (en) * | 2012-03-22 | 2012-08-01 | 上海市电力公司 | Pre-amplification circuit for MOA (metal oxide arrester) resistive current detecting system |
| CN203278401U (en) * | 2013-06-17 | 2013-11-06 | 成都荣耀科技有限公司 | Signal collector of distribution transformer remote monitoring system based on wireless communication |
-
2013
- 2013-06-17 CN CN2013102373219A patent/CN103278672A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051739A (en) * | 2007-04-13 | 2007-10-10 | 清华大学 | Digital current synthesizer |
| CN201378741Y (en) * | 2009-04-24 | 2010-01-06 | 王占武 | Reactive power compensation filtering controller |
| CN101551440A (en) * | 2009-05-15 | 2009-10-07 | 东北大学 | Generator transformer unit faults recorder analysis device |
| CN101771296A (en) * | 2010-02-05 | 2010-07-07 | 东北大学 | Method and device for power information detection and interconnection self-decision analysis |
| CN201726320U (en) * | 2010-05-28 | 2011-01-26 | 天津诺尔哈顿电器制造有限公司 | Precision rectifier circuit |
| CN102079009A (en) * | 2010-12-30 | 2011-06-01 | 哈尔滨工业大学 | Device for monitoring positive and negative half-wave asymmetry of primary current of transformer in resistance welding machine |
| CN102621367A (en) * | 2012-03-22 | 2012-08-01 | 上海市电力公司 | Pre-amplification circuit for MOA (metal oxide arrester) resistive current detecting system |
| CN203278401U (en) * | 2013-06-17 | 2013-11-06 | 成都荣耀科技有限公司 | Signal collector of distribution transformer remote monitoring system based on wireless communication |
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Application publication date: 20130904 |