CN1523370A - Signal conditioning apparatus for electronic current-voltage transformer testing - Google Patents
Signal conditioning apparatus for electronic current-voltage transformer testing Download PDFInfo
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- CN1523370A CN1523370A CNA031568955A CN03156895A CN1523370A CN 1523370 A CN1523370 A CN 1523370A CN A031568955 A CNA031568955 A CN A031568955A CN 03156895 A CN03156895 A CN 03156895A CN 1523370 A CN1523370 A CN 1523370A
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Abstract
The invention relates to a signal conditioning device to check electronic voltage current mutual inductor, including: input protective circuit to get current voltage signal in measuring range; isolating mutual inductor to proportionally attenuate the current voltage signal and prohibit high-frequency (HF) interference to get needed low-frequency (LF) current voltage signal; output protective circuit to protect data collecting card; interface circuit to bias the LF current voltage signal to meet the signal-earthing demand of data collecting card and transmit the signal to the data collecting card. It enlarges the amplitude measurement range of weak current system-virtual apparatus system, reduces the resistor heat effect, heightens amplitude measurement precision and protects the whole system against damage by overload signal.
Description
Technical field the present invention relates to a kind of signal regulating device that is used for the verification of electronic current voltage transformer (VT), belongs to the calibration technology field of measuring.
Background technology electronic current voltage transformer (VT) adapts to the demand for development of electric power digitalization, robotization, has solved the Insulation Problems of measuring system in the voltage levels electric system.The electronic current voltage transformer (VT) of China research at present still is in the laboratory study stage, and the electronic current voltage transformer (VT) is wanted practicability, must reach certain accuracy.In general, the output of the secondary of electronic current voltage transformer (VT) is by Optical Fiber Transmission, and former limit and secondary do not have direct electromagnetic connection.So, traditional verification that just can not be used for the electronic current voltage transformer (VT) at the tester of electromagnetic type current-voltage transformer.
In the prior art, with the process of virtual technology verification current-voltage transformer as shown in Figure 1, as electronic mutual inductor T to be checked
xWith standard mutual inductor T
sThe same signal S of former edge joint the time, with T
xSecondary output S
xAnd T
sSecondary output S
sImport the signal regulating device of virtual instrument mutual-inductor tester simultaneously, install S through this
xAnd S
sBe converted into the receptible light current of data collecting card institute and press signal S '
xAnd S '
sData acquisition card is S '
xAnd S '
sCollect in the computing machine and draw T by data processing algorithm
xRatio and angular difference.Because the receptible signal of data collecting card institute is-10V～+ weak electric signal of 10V, and the output of the secondary of standard mutual inductor is generally 100V and 5A, must input signal be nursed one's health, and still up to the present, does not also have a kind of appropriate signal conditioning device.
Summary of the invention the objective of the invention is to propose a kind of signal regulating device that is used for the verification of electronic current voltage transformer (VT); by signal regulating device signal is carried out linear attenuation and conversion; isolate input signal; with the protected data capture card; input signal is carried out filtering; get rid of unnecessary interference, to improve the precision of verification.
The signal regulating device that is used for the verification of electronic current voltage transformer (VT) that the present invention proposes comprises:
Input protection circuit is used for the outrange current and voltage signals of input validation device is suppressed to obtain the current and voltage signals in the range ability;
Isolation transformer is used for the current and voltage signals in the above-mentioned range ability is carried out ratio decay, and suppresses high frequency interference, to be met the requirement of data collecting card range and to meet the low-frequency current voltage signal of verification requirement;
Output protection circuit is used for the protected data capture card;
Interface circuit is used for the adjustment of setovering of above-mentioned low-frequency current voltage signal so that signal satisfies the signal ground requirement of data collecting card, and is transmitted the signal to data acquisition card.
Output protection circuit in the above-mentioned signal regulating device of the present invention comprises:
Stabilivolt is used for the sine voltage signal that absorption peak surpasses the capture card range;
Transient Suppression Diode is used for the fast transient pulse voltage that absorption peak surpasses the capture card range.
Input protection circuit in apparatus of the present invention has three kinds of different circuit design, wherein all comprises contacting controling circuit, and this contacting controling circuit comprises:
Fuse is used for the overload protection of whole contacting controling circuit;
Switch knob is used for energized and input signal lead;
Closing relay and often open node is used to control the state that switches on and off of power supply and input signal;
The normally closed node of overload relay is used to control the state that switches on and off of power supply and input signal;
Power light is used to indicate the state that switches on and off of power supply.
First kind of circuit design is: when the signal of input validation device is the voltage of 0～10V, also comprise:
Stabilivolt is used for the sine voltage signal that absorption peak surpasses 12V;
Transient Suppression Diode is used for the fast transient pulse voltage signal that absorption peak surpasses 12V;
Closing relay often open node and overload relay and normally closed node thereof, be used for the state that switches on and off of control input signals.Wherein isolation transformer is the voltage transformer (VT) of 10V/5V.
Second kind of circuit design is: when the signal of input validation device is the voltage of 10～100V, also comprise:
Voltage dependent resistor (VDR) is used for the sine voltage signal that absorption peak surpasses 120V;
Transient Suppression Diode is used for the fast transient pulse voltage signal that absorption peak surpasses 120V;
Closing relay often open node and overload relay and normally closed node thereof, be used for the state that switches on and off of control input signals.Isolation transformer wherein is the voltage transformer (VT) of 100V/5V.
The third circuit design is: when the signal of input validation device is the electric current of 0～5A, also comprise:
Often the opening of closing relay, normally closed node and overload relay and normally closed node thereof are used for the state that switches on and off of control input signals.Isolation transformer wherein is the current transformer of 5A/50mA.
The signal regulating device that is used for the verification of electronic current voltage transformer (VT) that the present invention proposes; not only enlarged the amplitude measurement scope of weak electricity system-virtual instrument system; reduced the thermal effect of resistance, improved the amplitude measurement precision, and the protection total system can not be subjected to the damage of overload signal.This device is very little for the caused skew of phase of input signals feature, can increase substantially phase measurement and checking precision.If without the ratio decay of mutual inductor, higher voltage and bigger electric current cause resistance heating by resistance, make the increase of resistance, make ohmically voltage signal fluctuation occur, thereby make the electric signal instability that enters virtual instrument system.The ratio that utilizes the national breastfeeding helpline that conditioning device of the present invention makes is in 0.05%, and angular difference is in 4 '.
Description of drawings
Fig. 1 is the structured flowchart of prior art lieutenant colonel galvanoscope voltage transformer device.
Fig. 2 is the schematic block circuit diagram of the signal regulating device that proposes of the present invention.
Fig. 3～Fig. 5 is embodiments of the invention.
Fig. 6 is the circuit diagram of the used contacting controling circuit of input protection circuit in apparatus of the present invention.
Embodiment
The present invention is designed for the signal regulating device of electronic current voltage transformer (VT) verification, its schematic block circuit diagram as shown in Figure 2, comprise: input protection circuit is used for the outrange current and voltage signals of input validation device is suppressed to obtain the current and voltage signals in the range ability; Isolation transformer is used for the current and voltage signals in the above-mentioned range ability is carried out ratio decay, and suppresses high frequency interference, to be met the requirement of data collecting card range and to meet the low-frequency current voltage signal of verification requirement; Output protection circuit is used for the protected data capture card; Interface circuit is used for the adjustment of setovering of above-mentioned low-frequency current voltage signal so that signal satisfies the signal ground requirement of data collecting card, and is transmitted the signal to data acquisition card.
Output protection circuit in the above-mentioned signal regulating device of the present invention comprises:
Stabilivolt is used for the sine voltage signal that absorption peak surpasses the capture card range;
Transient Suppression Diode is used for the fast transient pulse voltage that absorption peak surpasses the capture card range.
Input protection circuit in apparatus of the present invention has three kinds of different circuit design, wherein all comprises as shown in Figure 6, comprising contacting controling circuit: it is by fuse F, switch knob B, closing relay R
E4And often open node J
15, power light L overload relay normally closed node J
22, J
32And J
42Form.When device ready, the button B that closes connects closing relay R
E4, this relay often open node J
11, J
12, J
13And J
14Closure, normally closed node J
15Disconnect, connect corresponding input signal respectively.Power light L is bright simultaneously, indication on power supply.
When input signal was 0～10V voltage signal, the circuit of whole conditioning device as shown in Figure 3.Input protection circuit is often opened node J by closing relay
11, overload relay R
E2And normally closed node J
21, stabilivolt Z
iWith Transient Suppression Diode D
iForm, output protection circuit is similar, but Z
oAnd D
oRated voltage low.Isolation transformer adopts the voltage transformer (VT) of 10V/5V.During operate as normal, input protection circuit does not cause amplitude and phase deviation to 0～10V voltage signal of input; The voltage signal and the former input voltage signal that enter mutual inductor like this are equal to.Isolation transformer becomes original half with the amplitude of above-mentioned voltage signal; Because the low-pass characteristic of institute's employing mutual inductor, the high frequency interference in the signal will can not appear at the output terminal of voltage transformer (VT); Isolation transformer can cause very little phase shift to the voltage signal of input.So the output signal amplitude of mutual inductor is directly proportional with the original input signal amplitude, phase place is constant substantially.Therefore, the voltage signal that enters interface circuit has comprised the amplitude and the phase information of input voltage signal substantially, satisfies the amount limit requirement of data collecting card simultaneously, and this has also just reached the purpose of electronic transducer calibration instrument signal condition.When input voltage surpasses 10V, stabilivolt Z
iWith Transient Suppression Diode D
iAction is stabilized in 10V with voltage, guarantees that isolation transformer can not damage.When voltage further strengthens, overload relay R
E2Action, R
E2Normally closed node J
21And J
22Disconnect; J
22Disconnection cause closing relay R
E4Dead electricity, thereby R
E4often open node J
11And J
15Disconnect, not only cut off the combined floodgate control loop, and cut off input signal, guarantee that isolation transformer and data collecting card can not damage because of overload.The principle of output protection circuit is the same substantially with input protection circuit.During the transition state of and the above-mentioned actuating of relay malfunctioning when input protection circuit, output protection circuit is had an effect, and guarantees that data collecting card can not damage.
When input signal was 10～100V voltage signal, the circuit of whole conditioning device as shown in Figure 4.Input protection circuit is often opened node J by closing relay
12, overload relay R
E3And normally closed node J
31, voltage dependent resistor (VDR) R
iWith Transient Suppression Diode D
iForm.Output protection circuit is by stabilivolt Z
oWith Transient Suppression Diode D
oForm.Isolation transformer adopts the voltage transformer (VT) of 100V/5V.The principle of work of entire circuit is the situation of 0～10V substantially with above-mentioned input signal.Different is, by voltage dependent resistor (VDR) R
iCome absorption peak to surpass the input voltage signal of 120V.When voltage surpassed 120V, the voltage dependent resistor (VDR) action caused overload relay R
E3Action, R
E3Normally closed node J
31And J
32Disconnect; J
32Disconnection cause closing relay R
E4Dead electricity, thereby R
E4often open node J
12And J
15Disconnect, not only cut off the combined floodgate control loop, and cut off input signal, guarantee that isolation transformer and data collecting card can not damage because of overload.The principle of output protection circuit is the same substantially with input protection circuit.During the transition state of and the above-mentioned actuating of relay malfunctioning when input protection circuit, output protection circuit is had an effect, and guarantees that data collecting card can not damage.
Claims (8)
1, a kind of signal regulating device that is used for the verification of electronic current voltage transformer (VT) is characterized in that this device comprises:
Input protection circuit is used for the outrange current and voltage signals of input validation device is suppressed to obtain the current and voltage signals in the range ability;
Isolation transformer is used for the current and voltage signals in the above-mentioned range ability is carried out ratio decay, and suppresses high frequency interference, to be met the requirement of data collecting card range and to meet the low-frequency current voltage signal of verification requirement;
Output protection circuit is used for the protected data capture card;
Interface circuit is used for the adjustment of setovering of above-mentioned low-frequency current voltage signal so that signal satisfies the signal ground requirement of data collecting card, and is transmitted the signal to data acquisition card.
2, device as claimed in claim 1 is characterized in that wherein said output protection circuit comprises:
Stabilivolt is used for the sine voltage signal that absorption peak surpasses the capture card range;
Transient Suppression Diode is used for the fast transient pulse voltage that absorption peak surpasses the capture card range.
3, signal regulating device as claimed in claim 2 is characterized in that wherein said input protection circuit comprises contacting controling circuit, and this contacting controling circuit comprises:
Fuse is used for the overload protection of whole contacting controling circuit;
Switch knob is used for energized and input signal lead;
Closing relay and often open node is used to control the state that switches on and off of power supply and input signal;
The normally closed node of overload relay is used to control the state that switches on and off of power supply and input signal;
Power light is used to indicate the state that switches on and off of power supply; And
When the signal of input validation device is the voltage of 0～10V, also comprise:
Stabilivolt is used for the sine voltage signal that absorption peak surpasses 12V;
Transient Suppression Diode is used for the fast transient pulse voltage signal that absorption peak surpasses 12V;
Closing relay often open node and overload relay and normally closed node thereof, be used for the state that switches on and off of control input signals.
4, signal regulating device as claimed in claim 3 is characterized in that wherein isolation transformer is the 10V/5V voltage transformer (VT).
5, signal regulating device as claimed in claim 2 is characterized in that wherein said input protection circuit comprises contacting controling circuit, and this contacting controling circuit comprises:
Fuse is used for the overload protection of whole contacting controling circuit;
Switch knob is used for energized and input signal lead;
Closing relay and often open node is used to control the state that switches on and off of power supply and input signal;
The normally closed node of overload relay is used to control the state that switches on and off of power supply and input signal;
Power light is used to indicate the state that switches on and off of power supply; And
When the signal of input validation device is the voltage of 10～100V, also comprise:
Voltage dependent resistor (VDR) is used for the sine voltage signal that absorption peak surpasses 120V;
Transient Suppression Diode is used for the fast transient pulse voltage signal that absorption peak surpasses 120V;
Closing relay often open node and overload relay and normally closed node thereof, be used for the state that switches on and off of control input signals.
6, signal regulating device as claimed in claim 5 is characterized in that wherein said isolation transformer is the voltage transformer (VT) of 100V/5V.
7, signal regulating device as claimed in claim 2 is characterized in that wherein said input protection circuit comprises contacting controling circuit, and this contacting controling circuit comprises:
Fuse is used for the overload protection of whole contacting controling circuit;
Switch knob is used for energized and input signal lead;
Closing relay and often open node is used to control the state that switches on and off of power supply and input signal;
The normally closed node of overload relay is used to control the state that switches on and off of power supply and input signal;
Power light is used to indicate the state that switches on and off of power supply; And
When the signal of input validation device is the electric current of 0～5A, also comprise:
Often the opening of closing relay, normally closed node and overload relay and normally closed node thereof are used for the state that switches on and off of control input signals.
8, signal regulating device as claimed in claim 7 is characterized in that wherein said isolation transformer is the current transformer of 5A/50mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031568955A CN1523370A (en) | 2003-09-12 | 2003-09-12 | Signal conditioning apparatus for electronic current-voltage transformer testing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031568955A CN1523370A (en) | 2003-09-12 | 2003-09-12 | Signal conditioning apparatus for electronic current-voltage transformer testing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1523370A true CN1523370A (en) | 2004-08-25 |
Family
ID=34287128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031568955A Pending CN1523370A (en) | 2003-09-12 | 2003-09-12 | Signal conditioning apparatus for electronic current-voltage transformer testing |
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| Country | Link |
|---|---|
| CN (1) | CN1523370A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290345B (en) * | 2008-06-06 | 2010-10-13 | 北京浩霆光电技术有限责任公司 | Multifunctional mutual-inductor tester |
| CN101655544B (en) * | 2008-08-20 | 2012-07-25 | 国网电力科学研究院武汉南瑞有限责任公司 | Device for measuring and checking errors of digital mutual inductor |
| CN108490253A (en) * | 2018-06-21 | 2018-09-04 | 威胜电气有限公司 | New-style electronic voltage sensor circuit, detection method and its electric energy meter |
| CN110058069A (en) * | 2019-06-05 | 2019-07-26 | 合肥工业大学 | A kind of oscillograph isolation voltage sampling system |
| US11437923B2 (en) | 2017-02-13 | 2022-09-06 | Hamilton Sundstrand Corporation—Pcss | Variable resonant power converter with tunable inductor |
-
2003
- 2003-09-12 CN CNA031568955A patent/CN1523370A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290345B (en) * | 2008-06-06 | 2010-10-13 | 北京浩霆光电技术有限责任公司 | Multifunctional mutual-inductor tester |
| CN101655544B (en) * | 2008-08-20 | 2012-07-25 | 国网电力科学研究院武汉南瑞有限责任公司 | Device for measuring and checking errors of digital mutual inductor |
| US11437923B2 (en) | 2017-02-13 | 2022-09-06 | Hamilton Sundstrand Corporation—Pcss | Variable resonant power converter with tunable inductor |
| CN108490253A (en) * | 2018-06-21 | 2018-09-04 | 威胜电气有限公司 | New-style electronic voltage sensor circuit, detection method and its electric energy meter |
| CN110058069A (en) * | 2019-06-05 | 2019-07-26 | 合肥工业大学 | A kind of oscillograph isolation voltage sampling system |
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