CN201666911U - Voltage detecting device of medium- and high-voltage variable frequency speed governor - Google Patents
Voltage detecting device of medium- and high-voltage variable frequency speed governor Download PDFInfo
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- CN201666911U CN201666911U CN2010201222497U CN201020122249U CN201666911U CN 201666911 U CN201666911 U CN 201666911U CN 2010201222497 U CN2010201222497 U CN 2010201222497U CN 201020122249 U CN201020122249 U CN 201020122249U CN 201666911 U CN201666911 U CN 201666911U
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Abstract
The utility model discloses a voltage detecting device of a medium- and high-voltage variable frequency speed governor, comprising three first non-inductive resistors, three first voltage dividing resistors, three second non-inductive resistors, three second voltage dividing resistors and one signal processing unit; the three first non-inductive resistors are respectively and serially connected with a three-phase power input end of the medium- and high-voltage variable frequency speed governor and divide the voltage from the three-phase power input end; the three first voltage dividing resistors are respectively and serially connected with the first non-inductive resistors and divide the voltage from the first non-inductive resistors; the three second non-inductive resistors are respectively and serially connected with a three-phase power output end of the medium- and high-voltage variable frequency speed governor and divide voltage from the three-phase power output end; the three second voltage dividing resistors are respectively and serially connected with the second non-inductive resistors and are used for dividing the voltage from the second non-inductive resistors; the signal processing unit is connected between the first voltage dividing resistors, the second voltage dividing resistors and the main control system of the medium- and high-voltage variable frequency speed governor, and is used for converting received analog voltage signals into digital voltage signals and transmitting the same to the main control system; and the voltage detecting device of the medium- and high-voltage variable frequency speed governor has the advantages of precise voltage detection and lower cost.
Description
Technical field
The utility model relates to the variable-frequence governor technical field, refers in particular to a kind of device that is used to detect mesohigh variable-frequence governor input/output voltage.
Background technology
Along with the development of Power Electronic Technique, the mesohigh variable-frequence governor as industries such as metallurgy, petrochemical industry, water supply, electric power, has obtained more and more being application widely in the every field of national economy, and its energy-saving and cost-reducing effect is obvious.And in the mesohigh variable-frequence governor of all multiple topologies, many level of power unit cascade type mesohigh variable-frequence governor have the voltage fan-out capability strong, little to the harmonic pollution of electrical network, to plurality of advantages such as the dv/dt of motor output voltage are little, and become one of the main flow of mesohigh variable-frequence governor and optimal form.For major loop and the user's motor of protecting the mesohigh variable-frequence governor, must be in real time and accurately detect the input and output voltage of mesohigh variable-frequence governor, overvoltage or under-voltage problem appear to help solving power cell.
Fig. 1 shows a kind of voltage check device that is used for the mesohigh variable-frequence governor, the three-phase input voltage of mesohigh frequency converter, three-phase output voltage are respectively through the processing of input voltage mutual inductor 11, output voltage mutual inductor 13 and be sent to signal processing unit 15 after converting low voltage signal to, form small-signal via these signal processing unit 15 decay again, be sent to master control system 17 at last and carry out Monitoring and Controlling according to this voltage signal with primary heat transport system variable-frequence governor for master control system 17.
Another kind of common mesohigh variable-frequence governor voltage check device as shown in Figure 2, the three-phase input voltage of medium-high frequency transformer is through voltage transformer (VT) 19 step-downs, three-phase output voltage input signal processing unit 21 after the dividing potential drop of high-voltage signal voltage division processing unit 23, after the attenuation processing of this signal processing unit 21, deliver to master control system 25 again, for monitoring and the control of master control system 25 realizations to the primary heat transport system of variable-frequence governor.
From the above as can be seen, common mesohigh variable-frequence governor voltage check device adopts voltage transformer (VT) so that voltage signal is sampled, because the characteristic of voltage transformer (VT), exist the problem that can't detect low-frequency voltage signal, be difficult to accurately detect voltage, and the cost of voltage transformer (VT) is higher, has caused the high enterprise of whole cost of voltage check device.
In addition, existing voltage check device, its with master control system between be connected to carry out the transmission of signal by cable, can not effectively low pressure master control system and high pressure primary heat transport system be isolated fully, exist that signal disturbs and safety issue.On the other hand, cause also that wiring between voltage check device and the master control system is more, cabling is inconvenient.
Summary of the invention
The purpose of this utility model is to overcome the existing existing voltage detecting out of true of mesohigh variable-frequence governor voltage check device, defective that cost is high, provide a kind of voltage detecting accurately, mesohigh variable-frequence governor voltage check device that cost is comparatively cheap.
Another purpose of the present utility model be to provide a kind of security performance good, the wiring simple mesohigh variable-frequence governor voltage check device.
For achieving the above object, the utility model adopts following technical scheme: a kind of mesohigh variable-frequence governor voltage check device, include 3 first noninductive resistances, 3 first divider resistances, 3 second noninductive resistances, 3 second divider resistances and a signal processing unit, wherein, 3 first noninductive resistances are connected with the three-phase electricity input end of mesohigh variable-frequence governor respectively, are used for the voltage that comes from the three-phase electricity input end is carried out dividing potential drop; 3 first divider resistances are connected with described first noninductive resistance respectively, are used for the voltage that comes from described first noninductive resistance is carried out dividing potential drop; 3 second noninductive resistances are connected with the three-phase electricity output terminal of mesohigh variable-frequence governor respectively, are used for the voltage that comes from the three-phase electricity output terminal is carried out dividing potential drop; 3 second divider resistances are connected with described second noninductive resistance respectively, are used for the voltage that comes from described second noninductive resistance is carried out dividing potential drop; Signal processing unit is connected between the master control system of described first divider resistance, second divider resistance and mesohigh variable-frequence governor, and the analog voltage signal that is used for receiving converts digital voltage signal to, and is sent to described master control system.
In the above-mentioned mesohigh variable-frequence governor voltage check device, be provided with one first difference amplifier unit between described first divider resistance and the described signal processing unit, it carries out calculus of differences to the voltage signal from described first divider resistance and gets the outlet voltage signal, and the line voltage signal is reached described signal processing unit.
In the above-mentioned mesohigh variable-frequence governor voltage check device, the described first difference amplifier unit includes two first operational amplifiers, the in-phase input end of two first operational amplifiers is connected to one first divider resistance altogether, inverting input separately then is connected respectively with remaining two first divider resistance, have access to a feedback resistance between the output terminal of each first operational amplifier and the inverting input, and the divider resistance that has access to a ground connection between the tie point of two in-phase input ends and first divider resistance, the output terminal of described first operational amplifier is connected with described signal processing unit.
In the above-mentioned mesohigh variable-frequence governor voltage check device, the described first difference amplifier unit includes three first operational amplifiers, three first divider resistances are connected in the in-phase input end and the inverting input of one first operational amplifier respectively in twos, have access to a feedback resistance between the output terminal of each first operational amplifier and the inverting input, and the divider resistance that has access to a ground connection between in-phase input end and described first divider resistance, the output terminal of described first operational amplifier is connected with described signal processing unit.
In the above-mentioned mesohigh variable-frequence governor voltage check device, be provided with one second difference amplifier unit between described second divider resistance and the described signal processing unit, it carries out calculus of differences to the voltage signal from described second divider resistance and gets the outlet voltage signal, and the line voltage signal is reached described signal processing unit.
In the above-mentioned mesohigh variable-frequence governor voltage check device, the described second difference amplifier unit includes two second operational amplifiers, the in-phase input end of two second operational amplifiers is connected to one second divider resistance altogether, inverting input separately then is connected respectively with remaining two second divider resistance, have access to a feedback resistance between the output terminal of each second operational amplifier and the inverting input, and the divider resistance that has access to a ground connection between the tie point of two in-phase input ends and second divider resistance, the output terminal of described second operational amplifier is connected with described signal processing unit.
In the above-mentioned mesohigh variable-frequence governor voltage check device, the described second difference amplifier unit includes three second operational amplifiers, three second divider resistances are connected in the in-phase input end and the inverting input of one second operational amplifier respectively in twos, have access to a feedback resistance between the output terminal of each second operational amplifier and the inverting input, and the divider resistance that has access to a ground connection between the in-phase input end and second divider resistance, the output terminal of described second operational amplifier is connected with described signal processing unit.
In the above-mentioned mesohigh variable-frequence governor voltage check device, adopt optical fiber to be connected between described signal processing unit and the described master control system.
In the above-mentioned mesohigh variable-frequence governor voltage check device, described first divider resistance, the first difference amplifier unit, second divider resistance and signal processing unit are located on the printed circuit board (PCB), and are installed in the high-voltage board of mesohigh variable-frequence governor with described first noninductive resistance, second noninductive resistance.
In the above-mentioned mesohigh variable-frequence governor voltage check device, described first divider resistance, second divider resistance, the second difference amplifier unit and signal processing unit are located on the printed circuit board (PCB), and are installed in the high-voltage board of mesohigh variable-frequence governor with described first noninductive resistance, second noninductive resistance.
Than existing mesohigh variable-frequence governor voltage check device, the beneficial effects of the utility model are: use the noninductive resistance, divider resistance of series connection and input/output voltage is taken a sample, than the mode that adopts voltage transformer (VT), its low frequency characteristic is better, and precise control, even under the lower situation of low frequency and output voltage, also can improve the degree of accuracy that input/output voltage detects; In addition, because the cost of noninductive resistance helps reducing the overall cost of voltage check device far below voltage transformer (VT).Further, signal processing unit uses optical fiber to be connected to carry out signal between the two with master control system and transmits, can reduce the probability that is disturbed in the signal transport process, improve voltage detecting result's reliability, the error, zero of removing voltage detecting is effectively waftd and fluctuation, and can simplify the wiring between voltage check device and the master control system, and be convenient to wiring.
Description of drawings
Fig. 1 is a kind of structural representation of existing mesohigh variable-frequence governor voltage check device.
Fig. 2 is the structural representation of another kind of existing mesohigh variable-frequence governor voltage check device.
Fig. 3 is the structural representation of the utility model mesohigh variable-frequence governor voltage check device.
Fig. 4 is the structural representation of another embodiment of the utility model mesohigh variable-frequence governor voltage check device.
Fig. 5 is the structural representation of an embodiment again of the utility model mesohigh variable-frequence governor voltage check device.
Embodiment
For making those of ordinary skill in the art be expressly understood the purpose of this utility model, technical scheme and advantage more, the utility model is further elaborated below in conjunction with drawings and Examples.
With reference to shown in Figure 3, in a kind of embodiment of the present utility model, mesohigh variable-frequence governor voltage check device includes three first noninductive resistances 10, it is connected in series with the three-phase electricity input end of mesohigh variable-frequence governor respectively, one first difference amplifier unit 14 are inserted in each first noninductive resistance 10 one first divider resistance 12 back of connecting respectively, the three-phase electricity input voltage of variable-frequence governor is imported this first difference amplifier unit 14 to do further processing again through the dividing potential drop of first noninductive resistance 10, first divider resistance 12 and obtain corresponding low voltage signal.Three second noninductive resistances 16 are connected in series with the three-phase electricity output terminal of mesohigh variable-frequence governor respectively, one second difference amplifier unit 20 are inserted in each second noninductive resistance 10 one second divider resistance 18 back of connecting respectively again, the three-phase electricity output voltage of variable-frequence governor is imported this second difference amplifier unit 20 to do further processing then through second noninductive resistance 16, second divider resistance, 18 dividing potential drops and obtain corresponding low voltage signal.
First noninductive resistance 10 and second noninductive resistance 16 need to use the mesohigh noninductive resistance that is applicable to mesohigh voltage environment, and so-called mesohigh refers generally to its voltage more than or equal to 660V.According to different three-phase electricity input/output voltages, and select the noninductive resistance and the divider resistance of different resistances for use, for example, be the situation of 6kV for the three-phase electricity input/output voltage, can adopt resistance is first, second noninductive resistance 10,16 of 50M and first, second divider resistance 12,18 that resistance is 1M.
Use the noninductive resistance, divider resistance of series connection and the input/output voltage of centering high voltage variable frequency speed regulator is taken a sample, than the mode that adopts voltage transformer (VT), its low frequency characteristic is better, and precise control, even under the lower situation of low frequency and output voltage, also can improve the degree of accuracy that input/output voltage detects.In addition, because the cost of noninductive resistance helps reducing the overall cost of voltage check device far below voltage transformer (VT).
The 14 pairs of low voltage signals from first divider resistance 12 in the first difference amplifier unit carry out calculus of differences and draw corresponding line voltage signal, and the line voltage signal is reached a signal processing unit that is attached thereto 22; The 20 pairs of low voltage signals from second divider resistance 18 in the second difference amplifier unit carry out calculus of differences and draw corresponding line voltage signal, and the line voltage signal is reached signal processing unit 22.
In this embodiment, the first difference amplifier unit 14 includes two first operational amplifier U1, the in-phase input end of two first operational amplifier U1 is connected to one first divider resistance 12 altogether, inverting input separately then is connected respectively with remaining two first divider resistance 12, have access to a feedback resistance R10 between the output terminal of each first operational amplifier U1 and the inverting input, and the divider resistance R11 that has access to a ground connection between the tie point of two in-phase input ends and first divider resistance 12.The three-phase input voltage of mesohigh variable-frequence governor is respectively through first noninductive resistance 10,12 step-downs of first divider resistance, wherein one mutually again after the dividing potential drop of divider resistance R11, do calculus of differences with the voltage of other two-phases respectively, and export the line voltage signal of two-way decay to signal processing unit 22 at the output terminal of two first operational amplifier U1.The peak-peak of line voltage signal can require to determine by feedback resistance R10, the divider resistance R11 that selects different resistances according to the peak-peak of input voltage, the operating voltage range and the accuracy of detection of signal processing unit 22.
The second difference amplifier unit 20 adopts the structure identical with the first difference amplifier unit 14, it includes two second operational amplifier U2, the in-phase input end of two second operational amplifier U2 is connected to one second divider resistance 18 altogether, inverting input separately then is connected respectively with remaining two second divider resistance 18, have access to a feedback resistance R20 between the output terminal of each second operational amplifier U2 and the inverting input, and the divider resistance R21 that has access to a ground connection between the tie point of two in-phase input ends and second divider resistance 18.The three-phase output voltage of mesohigh variable-frequence governor is respectively through second noninductive resistance 16,18 step-downs of second divider resistance, wherein one mutually again after the dividing potential drop of divider resistance R21, do calculus of differences with the voltage of other two-phases respectively, and export the line voltage signal of two-way decay to signal processing unit 22 at the output terminal of two second operational amplifier U2.The peak-peak of line voltage signal can require to determine by feedback resistance R20, the divider resistance R21 that selects different resistances according to the peak-peak of output voltage, the operating voltage range and the accuracy of detection of signal processing unit 22.
Each route voltage signal that signal processing unit 22 will receive converts digital signal to, and is sent to the master control system 24 that is attached thereto, for monitoring and the control of master control system 24 realizations to primary heat transport system.Certainly, also the artificial line voltage signal that comes from the first difference amplifier unit 14, the second difference amplifier unit 20 can be converted to real-time storage after the digital signal, when receiving the request signal of master control system 24, again the data of being stored are sent to master control system 24.
Can adopt transmission mediums such as optical fiber, twisted-pair feeder to be connected between signal processing unit 22 and the master control system 24 to realize the transmission of signal.Preferably, using optical fiber to connect to carry out signal between the two transmits.With digital signaling each route voltage signal is sent to master control system 24 by optical fiber, can reduces the probability that is disturbed in the signal transport process, improve voltage detecting result's reliability, the error, zero of removing voltage detecting is effectively waftd and fluctuation.In addition, adopt optical fiber to communicate, than the existing mode that adopts cable to communicate, can simplify the wiring between voltage check device and the master control system 24, and be convenient to wiring.
Further, functional devices such as first divider resistance 12, the first difference amplifier unit 14, second divider resistance 18, the second difference amplifier unit 20 and signal processing unit 22 can be located on the printed circuit board (PCB), and be installed in the high-voltage board of mesohigh variable-frequence governor with first noninductive resistance 10, second noninductive resistance 16, and communicate by letter with master control system 24 by optical fiber, like this, the high pressure primary heat transport system and the low pressure master control system of mesohigh variable-frequence governor can be isolated fully reliably, the security of assurance system, and reduce interfering with each other between signal.
Consult shown in Figure 4, so that another kind of embodiment of the present utility model to be described.The three-phase input voltage of mesohigh variable-frequence governor is delivered to the first difference amplifier unit 14 respectively and is done further processing after the dividing potential drop of first noninductive resistance 10, first divider resistance 12, its three-phase output voltage is then delivered to the second difference amplifier unit 20 respectively and done further processing after the dividing potential drop of second noninductive resistance 16, second divider resistance 18.The difference of this embodiment and a last embodiment is to adopt the first difference amplifier unit 14 of different structure and the second difference amplifier unit 20 to make up this mesohigh variable-frequence governor voltage check device.In this embodiment, the first difference amplifier unit 14 includes three first operational amplifier U1, three first divider resistances 12 are connected in in-phase input end and the inverting input of one first operational amplifier U1 respectively in twos, have access to a feedback resistance R10 between the output terminal of each first operational amplifier U1 and the inverting input, and the divider resistance R11 that has access to a ground connection between the in-phase input end and first divider resistance 12.The second difference amplifier unit 20 also can adopt the structure identical with the first difference amplifier unit 14, it includes three second operational amplifier U2, three second divider resistances 18 are connected in in-phase input end and the inverting input of one second operational amplifier U2 respectively in twos, have access to a feedback resistance R20 between the output terminal of each second operational amplifier U2 and the inverting input, and the divider resistance R21 that has access to a ground connection between the in-phase input end and second divider resistance 18.Like this, the output terminal of three second operational amplifier U2 of the output terminal of three first operational amplifier U1 of the first difference amplifier unit 14, the second difference amplifier unit 20 export respectively the three-route voltage signal to signal processing unit 22 to do subsequent treatment.
Fig. 5 is the utility model structural representation of an embodiment again, the three-phase input voltage of mesohigh variable-frequence governor is sent into signal processing unit 22 respectively after the dividing potential drop of first noninductive resistance 10, first divider resistance 12 of series connection, and three-phase output voltage is also sent into signal processing unit 22 respectively after the dividing potential drop of second noninductive resistance 16, second divider resistance 18 of series connection, each road analog voltage signal that this signal processing unit 22 will receive converts digital voltage signal to, and be sent to the master control system 24 that is attached thereto, perhaps real-time storage is to treat master control system 24 inquiries.This embodiment compares with above-mentioned two embodiment, is to have omitted difference amplifier unit, further simplifies the structure of mesohigh variable-frequence governor voltage check device, certainly, owing to omitted difference amplifier unit, voltage signal is interfered easily in the process of transmitting, and reduces the precision of voltage detecting.
The above only is a preferred embodiment of the present utility model, but not the utility model is done any form restriction, and all equivalent variations or modifications of being done in the claim scope all should fall within the protection domain of the present utility model.
Claims (10)
1. a mesohigh variable-frequence governor voltage check device is characterized in that, includes:
3 first noninductive resistances (10) are connected with the three-phase electricity input end of mesohigh variable-frequence governor respectively, are used for the voltage that comes from the three-phase electricity input end is carried out dividing potential drop;
3 first divider resistances (12) are connected with described first noninductive resistance (10) respectively, are used for the voltage that comes from described first noninductive resistance (10) is carried out dividing potential drop;
3 second noninductive resistances (16) are connected with the three-phase electricity output terminal of mesohigh variable-frequence governor respectively, are used for the voltage that comes from the three-phase electricity output terminal is carried out dividing potential drop;
3 second divider resistances (18) are connected with described second noninductive resistance respectively, are used for the voltage that comes from described second noninductive resistance (16) is carried out dividing potential drop;
One signal processing unit (22), be connected between the master control system (24) of described first divider resistance (12), second divider resistance (18) and mesohigh variable-frequence governor, the analog voltage signal that is used for receiving converts digital voltage signal to, and is sent to described master control system (24).
2. mesohigh variable-frequence governor voltage check device as claimed in claim 1, it is characterized in that, be provided with one first difference amplifier unit (14) between described first divider resistance (12) and the described signal processing unit (22), it carries out calculus of differences to the voltage signal from described first divider resistance (12) and gets the outlet voltage signal, and the line voltage signal is reached described signal processing unit (22).
3. mesohigh variable-frequence governor voltage check device as claimed in claim 2, it is characterized in that, the described first difference amplifier unit (14) includes two first operational amplifiers (U1), the in-phase input end of two first operational amplifiers (U1) is connected to one first divider resistance (12) altogether, inverting input separately then is connected respectively with remaining two first divider resistance (12), have access to a feedback resistance (R10) between the output terminal of each first operational amplifier (U1) and the inverting input, and the divider resistance (R11) that has access to a ground connection between the tie point of two in-phase input ends and first divider resistance (12), the output terminal of described first operational amplifier (U1) is connected with described signal processing unit (22).
4. mesohigh frequency converter voltage pick-up unit as claimed in claim 2, it is characterized in that, the described first difference amplifier unit (14) includes three first operational amplifiers (U1), three first divider resistances (12) are connected in the in-phase input end and the inverting input of one first operational amplifier (U1) respectively in twos, have access to a feedback resistance (R10) between the output terminal of each first operational amplifier (U1) and the inverting input, and the divider resistance (R11) that has access to a ground connection between in-phase input end and described first divider resistance (12), the output terminal of described first operational amplifier (U1) is connected with described signal processing unit (22).
5. mesohigh variable-frequence governor voltage check device as claimed in claim 1 or 2, it is characterized in that, be provided with one second difference amplifier unit (20) between described second divider resistance (18) and the described signal processing unit (22), it carries out calculus of differences to the voltage signal from described second divider resistance (18) and gets the outlet voltage signal, and the line voltage signal is reached described signal processing unit (22).
6. mesohigh variable-frequence governor voltage check device as claimed in claim 5, it is characterized in that, the described second difference amplifier unit (20) includes two second operational amplifiers (U2), the in-phase input end of two second operational amplifiers (U2) is connected to one second divider resistance (18) altogether, inverting input separately then is connected respectively with remaining two second divider resistance (18), have access to a feedback resistance (R20) between the output terminal of each second operational amplifier (U2) and the inverting input, and the divider resistance (R21) that has access to a ground connection between the tie point of two in-phase input ends and second divider resistance (18), the output terminal of described second operational amplifier (U2) is connected with described signal processing unit (22).
7. mesohigh variable-frequence governor voltage check device as claimed in claim 5, it is characterized in that, the described second difference amplifier unit (20) includes three second operational amplifiers (U2), three second divider resistances (18) are connected in the in-phase input end and the inverting input of one second operational amplifier (U2) respectively in twos, have access to a feedback resistance (R20) between the output terminal of each second operational amplifier (U2) and the inverting input, and the divider resistance (R21) that has access to a ground connection between in-phase input end and second divider resistance (18), the output terminal of described second operational amplifier (U2) is connected with described signal processing unit (22).
8. mesohigh variable-frequence governor voltage check device as claimed in claim 1 is characterized in that, adopts optical fiber to be connected between described signal processing unit (22) and the described master control system (24).
9. mesohigh variable-frequence governor voltage check device as claimed in claim 2, it is characterized in that, described first divider resistance (12), the first difference amplifier unit (14), second divider resistance (18) and signal processing unit (22) are located on the printed circuit board (PCB), and are installed in the high-voltage board of mesohigh variable-frequence governor with described first noninductive resistance (10), second noninductive resistance (16).
10. mesohigh variable-frequence governor voltage check device as claimed in claim 5, it is characterized in that, described first divider resistance (12), second divider resistance (18), the second difference amplifier unit (20) and signal processing unit (22) are located on the printed circuit board (PCB), and are installed in the high-voltage board of mesohigh variable-frequence governor with described first noninductive resistance (10), second noninductive resistance (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201222497U CN201666911U (en) | 2010-02-23 | 2010-02-23 | Voltage detecting device of medium- and high-voltage variable frequency speed governor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201222497U CN201666911U (en) | 2010-02-23 | 2010-02-23 | Voltage detecting device of medium- and high-voltage variable frequency speed governor |
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| CN201666911U true CN201666911U (en) | 2010-12-08 |
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| CN2010201222497U Expired - Lifetime CN201666911U (en) | 2010-02-23 | 2010-02-23 | Voltage detecting device of medium- and high-voltage variable frequency speed governor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169137A (en) * | 2011-01-12 | 2011-08-31 | 株洲变流技术国家工程研究中心有限公司 | Signal processing method and measuring device for high-voltage frequency converter |
| CN103941076A (en) * | 2014-03-21 | 2014-07-23 | 宁波南车时代传感技术有限公司 | Middle direct voltage intelligent collection device for rail transit alternating-current driving system |
| CN110320399A (en) * | 2018-03-30 | 2019-10-11 | 株式会社京滨 | Voltage check device |
-
2010
- 2010-02-23 CN CN2010201222497U patent/CN201666911U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169137A (en) * | 2011-01-12 | 2011-08-31 | 株洲变流技术国家工程研究中心有限公司 | Signal processing method and measuring device for high-voltage frequency converter |
| CN102169137B (en) * | 2011-01-12 | 2014-08-06 | 株洲变流技术国家工程研究中心有限公司 | Signal processing method and measuring device for high-voltage frequency converter |
| CN103941076A (en) * | 2014-03-21 | 2014-07-23 | 宁波南车时代传感技术有限公司 | Middle direct voltage intelligent collection device for rail transit alternating-current driving system |
| CN110320399A (en) * | 2018-03-30 | 2019-10-11 | 株式会社京滨 | Voltage check device |
| CN110320399B (en) * | 2018-03-30 | 2023-08-04 | 日立安斯泰莫株式会社 | Voltage detection device |
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