CN101294990B - Current/voltage inbreak testing apparatus - Google Patents
Current/voltage inbreak testing apparatus Download PDFInfo
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- CN101294990B CN101294990B CN2007100742548A CN200710074254A CN101294990B CN 101294990 B CN101294990 B CN 101294990B CN 2007100742548 A CN2007100742548 A CN 2007100742548A CN 200710074254 A CN200710074254 A CN 200710074254A CN 101294990 B CN101294990 B CN 101294990B
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Abstract
The invention relates to a current-voltage intrusion monitoring device, belonging to the telecommunication technology and comprising an intrusion current collection module and an intrusion voltage collection module which obtain an intrusion current initial signal and an intrusion voltage initial signal by adopting a sensor; the current-voltage intrusion monitoring device is characterized in that the invention also comprises a current signal processing module, a voltage signal processing module, a central processing unit (CPU) and an alarming module; wherein, the current signal processing module separates an intrusion current detecting signal and an intrusion frequency detecting signal from the intrusion current initial signal and transfers the intrusion current detecting signal and the intrusion frequency detecting signal to the CPU; the voltage signal processing module receives the intrusion voltage initial signal, generates a corresponding intrusion voltage detecting signal and transfers the intrusion voltage detecting signal to the CPU which calculates relevant data of current or voltage intrusion according to the received signal, judges the intrusion level and sends a corresponding alarming signal to the alarming module; the current-voltage intrusion monitoring device has high reliability and good regulation performance.
Description
Technical field
The present invention relates to electrical communication technology, relate in particular to a kind of current/voltage inbreak testing apparatus.
Background technology
In program controlled system, the crosspoint front end that is connected with Hawser often is provided with the current/voltage invasion detecting device, and existing current/voltage invasion detecting device has following shortcoming:
One, only at certain specific frequency detecting, detection such as power frequency 50hz, realize by low pass filter simply, the situation that other frequency interferences can occur and can't discern, such as detecting 50hz power frequency invasion signal, but exist the interference signal of 25hz in the circuit, then be easy to take place misjudgment phenomenon.
Two, the grading control thresholding adopts analog circuit to realize, by switch or wire jumper control, the thresholding skew takes place behind the long-play and is difficult for finding, and also is difficult for revising threshold value even known.Therefore, prior art is low for the reliability of current/voltage intrusion detection, and adjusting function is relatively poor.
Summary of the invention
The object of the present invention is to provide a kind of reliability height and the good current/voltage inbreak testing apparatus of adjusting function, low to overcome in the prior art reliability for the current/voltage intrusion detection, the shortcoming that adjusting function is relatively poor.
Current/voltage inbreak testing apparatus of the present invention, comprise invasion current acquisition module and invasion voltage acquisition module, described invasion current acquisition module and invasion voltage acquisition module adopt transducer to obtain invasion electric current initialize signal and invasion voltage initialize signal, it is characterized in that; Also comprise current signal processing module, voltage signal processing module, central processing unit and alarm module, wherein,
Described current signal processing module is isolated invasion current detection signal and invasion frequency detecting signal from invasion electric current initialize signal, and it is passed to central processing unit;
Described voltage signal processing module receives invasion voltage initialize signal, produces corresponding invasion voltage detection signal, and it is passed to central processing unit;
Described central processing unit calculates the related data of curtage invasion according to received invasion current detection signal, invasion frequency detecting signal and invasion voltage detection signal, judges the invasion grade, and sends corresponding alarm signal to alarm module.
Described device also comprises the expansion control module, described expansion control module by and central processing unit between information interaction, to central processing unit transmission alarm control information, and outwards transmit central processing unit obtained invasion information and data.
Described expansion control module comprises an alarm output circuit and digital communication circuit, wherein,
Described alarm output circuit directly links to each other with the signal end of central processing unit, exports one and shows the alarm signal that whether has invasion;
Described digital communication circuit directly links to each other with the signal end of central processing unit, adopt the communication data frame format of setting, to central processing unit transmission alarm control information, and outwards send invasion current value, invasion frequency values, invasion magnitude of voltage, invasion class information and relevant invasion time parameter.
Described digital communication circuit adopts the RS485 communication chip.
Described current signal processing module comprises current signal amplification filtering circuit, current signal holding circuit, current signal output circuit and power frequency signal circuit, wherein,
Current signal amplification filtering circuit links to each other with the current signal holding circuit, current signal amplification filtering circuit received current initialize signal;
The input of current signal output circuit and power frequency signal circuit is connected to the output of current signal holding circuit;
Current signal output circuit output connects the signal end of central processing unit, to central processing unit output invasion current detection signal;
Power frequency signal circuit output connects the signal end of central processing unit, after this power frequency signal circuit adopts the zero passage comparison process, to central processing unit output invasion frequency detecting signal.
Described current signal amplification filtering circuit comprises the first operational amplifier U1D and filter capacitor C4,
The current signal holding circuit comprises first voltage follower of being made up of the second operational amplifier U1C;
The current signal output circuit comprises second voltage follower of being made up of the second operational amplifier U1A;
The power frequency signal circuit comprises four-operational amplifier U1B;
The amplifying signal of the first operational amplifier U1D output is exported amplifying signal to the second operational amplifier U1C input anode by after the filter capacitor C4 filtering;
The second operational amplifier U1C input cathode and output connect the input anode and the input cathode that is connected four-operational amplifier U1B of the 3rd operational amplifier U1A respectively by electric capacity:
The input cathode of the 3rd operational amplifier U1A links to each other with output, by resistance output invasion current detection signal, is connected to the signal end of central processing unit;
The input anode of four-operational amplifier U1B inserts first reference level, and the output of four-operational amplifier U1B produces invasion frequency detecting signal, is connected to the signal end of central processing unit.
Described voltage signal processing module comprises the voltage signal carry circuit of an employing metal-oxide-semiconductor field effect transistor Q2 at least, among this metal-oxide-semiconductor field effect transistor Q2;
Grid inserts invasion voltage initialize signal;
Drain electrode links to each other with the signal end of central processing unit, directly output invasion voltage detection signal;
Be connected first resistance between source electrode and the ground, be connected first electric capacity between grid and the ground.
Described voltage signal processing module comprises that voltage signal carry circuit, signal comparator circuit and signal condition output circuit also link to each other successively, wherein,
Signal comparator circuit comprises comparator U3A,
The signal condition output circuit comprises the inverter of being made up of triode Q3;
The drain electrode of metal-oxide-semiconductor field effect transistor Q2 is connected to the input anode of comparator U3A in the voltage signal carry circuit, and the input cathode of comparator U3A inserts second reference level;
The output of comparator U3A connects triode Q3 base stage, triode Q3 grounded emitter, and triode Q3 collector electrode is connected to the signal end of central processing unit, the invasion voltage detection signal that output is nursed one's health.
Described alarm module comprises the light emitting diode matrix of being made up of a plurality of light-emitting diodes, all light-emitting diode minus earths, and the light-emitting diode positive pole links to each other with the corresponding signal end of power supply or central processing unit.
Beneficial effect of the present invention is: in the present invention, adopt invasion current acquisition module, the invasion voltage acquisition module, current signal processing module, the voltage signal processing module, central processing unit and alarm module, the module that collects invasion current acquisition module and invasion voltage obtains invasion electric current initialize signal and invasion voltage initialize signal respectively, current signal processing module is isolated invasion current detection signal and invasion frequency detecting signal from invasion electric current initialize signal, the voltage signal processing module produces corresponding invasion voltage detection signal, central processing unit is according to receiving the invasion current detection signal, invasion frequency detecting signal and invasion voltage detection signal, calculate the related data of curtage invasion, judge the invasion grade, and send corresponding alarm signal to alarm module.On the one hand, the present invention produces independent invasion frequency detecting signal, central processing unit can calculate corresponding invasion frequency values, with respect in the prior art at certain specific frequency detecting, the present invention can obtain and more objectively invade data, thereby the minimizing misjudgment phenomenon improves functional reliability.On the other hand, the present invention adopts central processing unit to finish internal calculation and control, because the processing procedure of central processing unit is a kind of digitized internal calculation and control procedure, relevant control thresholding can be set in central processing unit or be built-in, very convenient when needs are changed, the change of control threshold parameter does not relate to the change of hardware, obviously yet, realize the grading control thresholding with respect to the available technology adopting analog circuit, the present invention has good adjusting function and functional reliability.In a word, reliability height of the present invention and adjusting function are good.
In the present invention, by the information interaction between expansion control module and the central processing unit, to central processing unit transmission alarm control information, and outwards transmit central processing unit obtained invasion information and data, can further improve application performance of the present invention and controllability, for example, the expansion control module adopts the digital communication circuit directly to link to each other with the signal end of central processing unit, adopt the communication data frame format of setting, to central processing unit transmission alarm control information, and outwards current value is invaded in transmission, the invasion frequency values, the invasion magnitude of voltage, invasion class information and relevant invasion time parameter, this digital communication circuit can be finished the communication between central processing unit and the host computer, thereby realize of the present invention real-time, On-line Control, and can be as required (for example to the alarm control information, the control threshold parameter) real time modifying, the present invention is dynamically controlled, perhaps host computer carries out FEEDBACK CONTROL according to real-time status to the present invention, has greatly improved adjusting function of the present invention.
Current signal processing module among the present invention adopts operational amplifier, comparator and simple peripheral cell, and simple in structure, cost is low.The voltage signal processing module adopts metal-oxide-semiconductor field effect transistor, and comparator, triode and simple peripheral cell, and simple in structure, cost is low.
Description of drawings
Fig. 1 is a general structure schematic diagram of the present invention;
Fig. 2 is the embodiment of the invention 1 a refined structure schematic diagram;
Fig. 3 is the embodiment of the invention 1 circuit diagram;
Fig. 4 is the embodiment of the invention 2 refined structure schematic diagrames;
Fig. 5 is the embodiment of the invention 2 circuit diagrams.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
According to Fig. 1 and Fig. 2, the present invention includes invasion current acquisition module 1, invasion voltage acquisition module 2, current signal processing module 3, voltage signal processing module 4, central processing unit 5, alarm module 6 and expansion control module 7, invasion current acquisition module 1 and invasion voltage acquisition module 2 adopt transducer to obtain invasion electric current initialize signal and invasion voltage initialize signal, for example, the instrument transformer that adopts annular core and coil to constitute is obtained invasion electric current initialize signal and invasion voltage initialize signal.
As shown in Figure 2, current signal processing module 3 is isolated invasion current detection signal and invasion frequency detecting signal from invasion electric current initialize signal, and it is passed to central processing unit 5; Voltage signal processing module 4 receives invasion voltage initialize signal, produces corresponding invasion voltage detection signal, and it is passed to central processing unit 5.Central processing unit 5 calculates the related data of curtage invasion according to received invasion current detection signal, invasion frequency detecting signal and invasion voltage detection signal, judges the invasion grade, and sends corresponding alarm signal to alarm module 6.Judgement for the invasion grade, can judge according to the standard of some industry defineds, relevant control thresholding can be set in central processing unit 5 or be built-in, central processing unit 5 is preserved invasion current detection signal, invasion frequency detecting signal and invasion voltage detection signal, and be worth writing time, after process is calculated, can obtain invading current value, invasion frequency values, invasion magnitude of voltage, invasion class information and relevant invasion time parameter, as invading current time value etc.
Particularly, as shown in Figures 2 and 3, current signal processing module 3 comprises current signal amplification filtering circuit 31, current signal holding circuit 32, current signal output circuit 33 and power frequency signal circuit 34.
As shown in Figure 2, current signal amplification filtering circuit 31 links to each other with current signal holding circuit 32, current signal amplification filtering circuit 31 received current initialize signals, the input of current signal output circuit 33 and power frequency signal circuit 34 is connected to the output of current signal holding circuit 32, current signal output circuit 33 outputs connect the signal end of central processing unit 5, to central processing unit 5 output invasion current detection signals, power frequency signal circuit 34 outputs connect the signal end of central processing unit 5, after this power frequency signal circuit 34 adopts the zero passage comparison process, to central processing unit 5 output invasion frequency detecting signals.
As shown in Figure 3, current signal amplification filtering circuit 31 comprises the first operational amplifier U1D and filter capacitor C4 and peripheral electric capacity, resistance, current signal holding circuit 32 comprises first voltage follower of being made up of the second operational amplifier U1C, current signal output circuit 33 comprises second voltage follower of being made up of the 3rd operational amplifier U1A, and power frequency signal circuit 34 comprises the 4th operational amplification circuit U1B.
As shown in Figure 3, in the current signal amplification filtering circuit 31, two inputs of the first operational amplifier U1D insert invasion electric current initialize signal, the amplifying signal of the first operational amplifier U1D output is exported amplifying signal to the second operational amplifier U1C input anode by after the filter capacitor C4 filtering.
As shown in Figure 3, in the current signal holding circuit 32, the second operational amplifier U1C input cathode and output are connected to the input anode and the input cathode that is connected four-operational amplifier U1B of the 3rd operational amplifier U1A respectively by capacitor C 3, C6; The current signal holding circuit 32 that is made of the second operational amplifier U1C has improved output impedance, to having played buffer action between current signal amplification filtering circuit 31 and the current signal output circuit 33.
As shown in Figure 3, in the current signal output circuit 33, the input cathode of the 3rd operational amplifier U1A links to each other with output, by resistance R 5 output invasion current detection signal S_IN, is connected to the signal end 12 of central processing unit 5.
As shown in Figure 3, in the power frequency signal circuit 34, the input anode of four-operational amplifier U1B inserts the first reference level Uref1, the series arm that this first reference level Uref1 constitutes by resistance R 17, adjustable resistance R21, resistance R 22, obtain by adjustable resistance R21 dividing potential drop, the output of four-operational amplifier U1B produces invasion frequency detecting signal F_IN, is connected to the signal end 6 of central processing unit 5 by resistance R 7.
As shown in Figure 3, voltage signal processing module 4 comprises the voltage signal carry circuit 41 of an employing metal-oxide-semiconductor field effect transistor Q2, among this metal-oxide-semiconductor field effect transistor Q2, grid G inserts invasion voltage initialize signal, drain D links to each other with the signal end 8 of central processing unit 5, direct output invasion voltage detection signal P_IN is connected first resistance R 28 between source S and the ground, is connected first capacitor C 13 between grid G and the ground.
As shown in Figure 3, alarm module 6 comprises the light emitting diode matrix of being made up of a plurality of LEDs 0, LED1, LED2, LED3, LED4, all LEDs 0, LED1, LED2, LED3, LED4 minus earth, LED 0 positive pole links to each other with power supply VCC, and LED 1, LED2, LED3, LED4 positive pole link to each other with the signal end 14,15,16,17 of central processing unit 5 respectively.
LED 0 is lighted, and shows that then power supply VCC is communicated with.LED 1 is set at stand by lamp, judges when central processing unit 5 to have curtage invasion (no matter how it invades grade), and this LED 1 is lighted.
| The LED2 state | The LED3 state | The LED4 state | Value | The invasion grade |
| 0 | 0 | 0 | 0 | With nowhere to turn to the police |
| 0 | 0 | 1 | 1 | Warning alarm |
| 0 | 1 | 0 | 2 | |
| 0 | 1 | 1 | 3 | |
| 1 | 0 | 0 | 4 | |
| 1 | 0 | 1 | 5 | Critical alarm |
Table 1
As depicted in figs. 1 and 2, expansion control module 7 by and central processing unit 5 between information interaction, transmit the alarm control informations to central processing unit 5, and outwards transmit central processing unit 5 obtained invasion information and data.
As shown in Figures 2 and 3, expansion control module 7 comprises an alarm output circuit 71 and digital communication circuit 72, alarm output circuit 71 directly links to each other with the signal end 18 of central processing unit 5, alarm output circuit 71 adopts an inverter that is made of triode Q1, triode Q1 base stage receives the signal AOUT that the signal end 18 by central processing unit 5 sends, one of triode Q1 collector electrode output shows the alarm signal SOUT that whether has invasion, alarm signal SOUT is a digitized signal, have curtage invasion (no matter how it invades grade) as long as central processing unit 5 is judged, alarm signal SOUT will be corresponding high level or low level (height, low level definition can be set as required).
As shown in Figures 2 and 3, digital communication circuit 72 directly links to each other with the signal end of central processing unit 5, digital communication circuit 72 adopts RS485 communication chip U2, the end pin 4 of communication chip U2,3,1 respectively with the signal end 3 of central processing unit 5,9,2 link to each other, the end pin 6 of communication chip U2,7 A, the B port then links to each other with host computer 8, in communication, adopt communication data frame format as shown in table 2 below, transmit the alarm control information to central processing unit 5, and outwards send the invasion current value, the invasion frequency values, the invasion magnitude of voltage, invasion class information and relevant invasion time parameter.
Table 2
As shown in table 3 below, as follows about the regulation of control identification code CID2:
Table 3
As shown in table 4 below, as follows about the regulation of command information INFO form:
Table 4
Embodiment 2:
According to Fig. 4 and Fig. 5, the main distinction of present embodiment and embodiment 1 is; In the present embodiment, voltage signal processing module 4 also comprises signal comparator circuit 42 and signal condition output circuit 43, voltage signal carry circuit 41, signal comparator circuit 42 and signal condition output circuit 43 link to each other successively, as shown in Figure 5, signal comparator circuit 42 comprises comparator U3A, signal condition output circuit 43 comprises the inverter of being made up of triode Q3, and the drain D of metal-oxide-semiconductor field effect transistor Q2 is connected to the input anode of comparator U3A in the voltage signal carry circuit 41.
In signal comparator circuit 42, the input cathode of comparator U3A inserts the second reference level Uref2, this second reference level Uref2 is obtained by the series connection dividing potential drop of resistance R 19 and resistance R 20, series resistor R25 and adjustable resistance R24 between the input anode of comparator U3A and the power supply VCC.
The output of comparator U3A connects triode Q3 base stage, in signal condition output circuit 43, and triode Q3 grounded emitter, triode Q3 collector electrode is connected to the signal end 8 of central processing unit 5, the invasion voltage detection signal P_VIN that output is nursed one's health.
Structure, principle, method and embodiment 1 as for other parts are described same or similar, repeat no more herein.
In sum, although basic structure of the present invention, principle, method are specifically set forth by the foregoing description, under the prerequisite that does not break away from main idea of the present invention, according to above-described inspiration, those of ordinary skills can not need to pay creative work can implement multiple conversion/alternative form or combination, repeats no more herein.
Claims (9)
1. current/voltage inbreak testing apparatus, comprise invasion current acquisition module and invasion voltage acquisition module, described invasion current acquisition module and invasion voltage acquisition module adopt transducer to obtain invasion electric current initialize signal and invasion voltage initialize signal, it is characterized in that; Also comprise current signal processing module, voltage signal processing module, central processing unit and alarm module, wherein,
Described current signal processing module is isolated invasion current detection signal and invasion frequency detecting signal from invasion electric current initialize signal, and it is passed to central processing unit;
Described voltage signal processing module receives invasion voltage initialize signal, produces corresponding invasion voltage detection signal, and it is passed to central processing unit;
Described central processing unit calculates the related data of curtage invasion according to received invasion current detection signal, invasion frequency detecting signal and invasion voltage detection signal, judges the invasion grade, and sends corresponding alarm signal to alarm module.
2. current/voltage inbreak testing apparatus according to claim 1, it is characterized in that: described device also comprises the expansion control module, described expansion control module by and central processing unit between information interaction, to central processing unit transmission alarm control information, and outwards transmit central processing unit obtained invasion information and data.
3. current/voltage inbreak testing apparatus according to claim 2 is characterized in that: described expansion control module comprises an alarm output circuit and digital communication circuit, wherein,
Described alarm output circuit directly links to each other with the signal end of central processing unit, exports one and shows the alarm signal that whether has invasion;
Described digital communication circuit directly links to each other with the signal end of central processing unit, adopt the communication data frame format of setting, to central processing unit transmission alarm control information, and outwards send invasion current value, invasion frequency values, invasion magnitude of voltage, invasion class information and relevant invasion time parameter.
4. current/voltage inbreak testing apparatus according to claim 3 is characterized in that: described digital communication circuit adopts the RS485 communication chip.
5. according to any described current/voltage inbreak testing apparatus among the claim 1-4, it is characterized in that: described current signal processing module comprises current signal amplification filtering circuit, current signal holding circuit, current signal output circuit and power frequency signal circuit, wherein
Current signal amplification filtering circuit links to each other with the current signal holding circuit, current signal amplification filtering circuit received current initialize signal;
The input of current signal output circuit and power frequency signal circuit is connected to the output of current signal holding circuit;
Current signal output circuit output connects the signal end of central processing unit, to central processing unit output invasion current detection signal;
Power frequency signal circuit output connects the signal end of central processing unit, after this power frequency signal circuit adopts the zero passage comparison process, to central processing unit output invasion frequency detecting signal.
6. current/voltage inbreak testing apparatus according to claim 5 is characterized in that:
Described current signal amplification filtering circuit comprises first operational amplifier (U1D) and filter capacitor (C4),
The current signal holding circuit comprises first voltage follower of being made up of second operational amplifier (U1C);
The current signal output circuit comprises second voltage follower of being made up of the 3rd operational amplifier (U1A);
The power frequency signal circuit comprises four-operational amplifier (U1B);
The amplifying signal of first operational amplifier (U1D) output is exported amplifying signal to the second operational amplifier (U1C) input anode by after filter capacitor (C4) filtering;
Second operational amplifier (U1C) input cathode and output connect the input anode and the input cathode that is connected four-operational amplifier (U1B) of the 3rd operational amplifier (U1A) respectively by electric capacity:
The input cathode of the 3rd operational amplifier (U1A) links to each other with output, by resistance output invasion current detection signal, is connected to the signal end of central processing unit;
The input anode of four-operational amplifier (U1B) inserts first reference level, and the output of four-operational amplifier (U1B) produces invasion frequency detecting signal, is connected to the signal end of central processing unit.
7. according to any described current/voltage inbreak testing apparatus among the claim 1-4, it is characterized in that: described voltage signal processing module comprises the voltage signal carry circuit of an employing metal-oxide-semiconductor field effect transistor (Q2) at least, in this metal-oxide-semiconductor field effect transistor (Q2);
Grid inserts invasion voltage initialize signal;
Drain electrode links to each other with the signal end of central processing unit, directly output invasion voltage detection signal;
Be connected first resistance (R28) between source electrode and the ground, be connected first electric capacity (C13) between grid and the ground.
8. current/voltage inbreak testing apparatus according to claim 7 is characterized in that: described voltage signal processing module comprises that voltage signal carry circuit, signal comparator circuit and signal condition output circuit also link to each other successively, wherein,
Signal comparator circuit comprises comparator (U3A),
The signal condition output circuit comprises the inverter of being made up of triode (Q3);
The drain electrode of metal-oxide-semiconductor field effect transistor in the voltage signal carry circuit (Q2) is connected to the input anode of comparator (U3A), and the input cathode of comparator (U3A) inserts second reference level;
The output of comparator (U3A) connects triode (Q3) base stage, triode (Q3) grounded emitter, and triode (Q3) collector electrode is connected to the signal end of central processing unit, the invasion voltage detection signal that output is nursed one's health.
9. according to any described current/voltage inbreak testing apparatus among the claim 1-4, it is characterized in that: described alarm module comprises the light emitting diode matrix of being made up of a plurality of light-emitting diodes, all light-emitting diode minus earths, the light-emitting diode positive pole links to each other with the corresponding signal end of power supply or central processing unit.
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| CN2007100742548A CN101294990B (en) | 2007-04-28 | 2007-04-28 | Current/voltage inbreak testing apparatus |
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| CN2007100742548A CN101294990B (en) | 2007-04-28 | 2007-04-28 | Current/voltage inbreak testing apparatus |
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| CN101294990B true CN101294990B (en) | 2011-12-07 |
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| CN106597067B (en) * | 2016-12-15 | 2019-06-21 | 中国电子科技集团公司第四十一研究所 | The voltage or current measuring device and method of a kind of random waveform arbitrary point |
| CN111949981B (en) * | 2020-09-17 | 2022-11-29 | 苏州浪潮智能科技有限公司 | Intrusion detection device and method for processor not being powered on |
| CN113295908A (en) * | 2021-04-29 | 2021-08-24 | 安徽凯承源电子科技有限公司 | Distribution transformer voltage detection device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2300111Y (en) * | 1996-05-17 | 1998-12-09 | 新基业实业发展有限公司 | Cluster digital watt-hour meter |
| CN2781685Y (en) * | 2005-02-05 | 2006-05-17 | 苏州维运科技有限公司 | Intelligent monitoring alarm used for distributing frame machine room of telecommunications office |
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2007
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2300111Y (en) * | 1996-05-17 | 1998-12-09 | 新基业实业发展有限公司 | Cluster digital watt-hour meter |
| CN2781685Y (en) * | 2005-02-05 | 2006-05-17 | 苏州维运科技有限公司 | Intelligent monitoring alarm used for distributing frame machine room of telecommunications office |
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