CN2872375Y - Anti-intrusion break monitor - Google Patents
Anti-intrusion break monitor Download PDFInfo
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- CN2872375Y CN2872375Y CN 200620050048 CN200620050048U CN2872375Y CN 2872375 Y CN2872375 Y CN 2872375Y CN 200620050048 CN200620050048 CN 200620050048 CN 200620050048 U CN200620050048 U CN 200620050048U CN 2872375 Y CN2872375 Y CN 2872375Y
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Abstract
An anti-jamming disconnection monitoring device has good resistance against the interference of current in zero line of three-phase four-wire energy meter. The utility model comprises a metal case inside which a signal amplifier (1), a phase failure discrimination circuit (2), a zero line disconnection discrimination circuit (3), and a zero line disconnection delay circuit (4) are disposed. The phase failure discrimination circuit (2) is further connected electrically to a gate circuit (5) and a three-phase four-wire meter monitor (6). The three-phase four-wire meter monitor (6) can discriminate the disconnection of one phase of the three-phase power line of electric network of small-current grounding system at a voltage one level higher than 400v/230v voltage, and has good resistance against the interference produced by current in zero line of three-phase four-wire energy meter, thereby improving the electrical reliability.
Description
Affiliated technical field
The utility model relates to a kind of measuring and monitoring device disconnection monitoring device, especially three-phase and four-line electric energy meter neutral line current is had the anti-interference disconnection monitoring device of high noise immunity.
Background technology
At present, we know application number 200420069063.4 utility model patents---measuring and monitoring device disconnection monitoring device is and application number 200420068270.8 utility model patents---a kind of device that the three-phase and four-line measuring and monitoring device is used.Signal amplifier (1), phase failure line judging circuit (2), disconnected zero line judging circuit (3), disconnected zero line delay circuit (4), two AND circuit (5) and three-phase and four-line measuring and monitoring device (6) are electrically connected to be formed.This utility model is to be operated in the three-phase four wire system of 400V/230V electric pressure, when than the disconnected phase line of the three-phase power circuit of the power network (small current neutral grounding system) of the taller electric pressure of 400V/230V electric pressure, the three-phase and four-line electric system that is in low-pressure side has become the single-phase four line electric system that voltage is 400V, broken string is zero in low-pressure side to zero line voltage, high level of operational amplifier (IC2-2) output of the outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6); Because the three-phase and four-line electric system has become the single-phase four line electric system that voltage is 400V, broken string is zero in low-pressure side to zero line voltage, the zero line port of three-phase and four-line electric energy meter does not just have electric current to flow through, the voltage of diode (D31) negative pole output is just very low in the signal amplifier (1), phase failure line judging circuit (2) output high level, (5) two conditions of two AND circuit satisfy, two AND circuit (5) output high level, stop three-phase and four-line measuring and monitoring device (6) tripping operation to have a power failure, after so application number 200420069063.4 utility model patents and application number 200420068270.8 utility model patents are used, three-phase and four-line measuring and monitoring device (6) can be because of than the disconnected phase line of the three-phase power circuit of the power network (small current neutral grounding system) of the taller electric pressure of 400V/230V electric pressure, and causes unnecessary power failure.But, in actual three-phase and four-line electric system, A, B, C phase voltage effective value also not exclusively equates, sometimes even bigger difference occurs, again because of the resistance difference between the voltage component of electric energy meter, and the zero-sequence component in the system, the influence of voltages such as harmonic component, in three-phase and four-line electric energy meter voltage element circuit interface zero line, there is bigger electric current to flow through, because interrupting the inverting input of the operational amplifier (IC4-4) of phase line judging circuit (2), measuring and monitoring device disconnection monitoring device is connected with diode (D31) negative electricity in the signal amplifier (1), this electric current is enough to allow one of middle diode (D31) the negative pole output of signal amplifier (1) compare higher voltage, make operational amplifier (IC4-4) output low level of its phase failure line judging circuit (2), thereby cause two AND circuit (5) to lose to satisfy two high level conditions just can stop the condition of three-phase and four-line measuring and monitoring device (6) tripping operation in having a power failure, if it is serious uneven that three-phase and four-line electric system this moment phase voltage occurs, and there is bigger electric current to flow through in the three-phase and four-line electric energy meter voltage element circuit interface zero line, the operational amplifier (IC2-2) of the outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6) just might be exported high level, because two AND circuit (5) are failed to export high level and are gone to stop three-phase and four-line measuring and monitoring device (6) tripping operation power failure order, the high level of outage judging circuit (VII) operational amplifier (IC2-2) output may cause the user to have a power failure, make device interference free performance variation, the power failure that appearance should not have a power failure has influenced the power supply reliability to the user that abides by the law.
Summary of the invention
In order to overcome application number 200420069063.4 utility model patents---measuring and monitoring device disconnection monitoring device is and application number 200420068270.8 utility model patents---the three-phase and four-line measuring and monitoring device is used down, when serious imbalance appears in three-phase and four-line electric system phase voltage, make device interference free performance variation, the deficiency that the user is easily caused power failure, the utility model provides a kind of anti-interference disconnection monitoring device, this anti-interference disconnection monitoring device has not only kept all functions of application number 200420069063.4 utility model patents, and the disturbing effect that three-phase and four-line electric energy meter neutral line current is produced has stronger anti-interference effect.
The technical scheme that its technical problem that solves the utility model adopts is: with application number 200420069063.4 utility model patents---the inverting input that broken line monitoring device of metering monitor interrupts the operational amplifier (IC4-4) of phase line judging circuit (2) is electrically connected with the disconnection of signal amplifier (1) diode (D31) negative pole; The inverting input of operational amplifier (IC4-4) in the disconnected phase line judging circuit (2) is connected with the negative electricity of the diode (D18) of three-phase and four-line measuring and monitoring device (6) middle outage judging circuit (VII), all the other electric connection mode are with application number 200420069063.4 utility model patents---broken line monitoring device of metering monitor again. Because the utility model is to be operated in the three-phase four wire system of 400V/230V electric pressure, when than the disconnected phase line of the three-phase power circuit of the power network (small current neutral grounding system) of the taller electric pressure of 400V/230V electric pressure, the three-phase and four-line electric system that is in low-pressure side has become the single-phase four line electric system that voltage is 400V, broken string is zero in low-pressure side to zero line voltage, high level of operational amplifier (IC2-2) output of the outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6); Again because the three-phase and four-line electric system has become the single-phase four line electric system that voltage is 400V, broken string is zero in low-pressure side to zero line voltage, the zero line port of three-phase and four-line electric energy meter does not just have electric current to flow through, the voltage of the negative pole of the diode (D18) of outage judging circuit (VII) output is just very low in the three-phase and four-line measuring and monitoring device (6), make phase failure line judging circuit (2) also export high level, (5) two conditions of two AND circuit satisfy, two AND circuit (5) output high level stops three-phase and four-line measuring and monitoring device (6) tripping operation to have a power failure.As three-phase and four-line electric system A, B, bigger difference appears in C phase voltage effective value, add the zero-sequence component in the system, the influence of voltages such as harmonic component, in three-phase and four-line electric energy meter voltage element circuit interface zero line, there is bigger electric current to flow through, the signal source of phase failure line judging circuit (2) is taken to the front end of having changed into signal amplifier (1) from signal amplifier (1) output terminal by original, the voltage amplification factor that signal amplitude has reduced this one-level of signal amplifier (1) doubly, the signal voltage of exporting on diode (D18) negative pole of outage judging circuit (VII) in three-phase and four-line measuring and monitoring device (6) is very little, make this undertension to promote phase failure line judging circuit (2), phase failure line judging circuit (2) continues to keep high level output, even three-phase voltage occurs serious uneven, impel operational amplifier (IC2-2) the output high level of outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6), (5) two conditions of two AND circuit satisfy, two AND circuit (5) output high level stops three-phase and four-line measuring and monitoring device (6) tripping operation to have a power failure.Have only when electric energy meter metered voltage loop phase failure line, phase failure line judging circuit (2) is output low level, makes two AND circuit (5) output low level, sends the order that does not stop power failure.So both guaranteed the recognition capability of three-phase and four-line measuring and monitoring device (6) to the disconnected phase line of three-phase power circuit of the power network (small current neutral grounding system) of the taller electric pressure of electric pressure 400V/230V, the disturbing effect that three-phase and four-line electric energy meter neutral line current is produced has stronger anti-interference effect again, reaches the purpose that improves the device power supply reliability.
The beneficial effects of the utility model are, make the recognition capability of three-phase and four-line measuring and monitoring device (6) maintenance than the disconnected phase line of three-phase power circuit of the power network (small current neutral grounding system) of the taller electric pressure of electric pressure 400V/230V, and the disturbing effect that three-phase and four-line electric energy meter neutral line current is produced has stronger anti-interference effect, the reliability of raising device power supply.
Description of drawings
Below in conjunction with drawings and Examples this practicality is newly further specified.
Fig. 1 is measuring and monitoring device disconnection monitoring device and three-phase and four-line measuring and monitoring device functional-block diagram.
Fig. 2 is anti-interference disconnection monitoring device and three-phase and four-line measuring and monitoring device functional-block diagram.
Fig. 3 is measuring and monitoring device disconnection monitoring device and three-phase and four-line measuring and monitoring device part circuit theory diagrams.
Fig. 4 is anti-interference disconnection monitoring device and three-phase and four-line measuring and monitoring device part circuit theory diagrams.
1. signal amplifiers among the figure, 2. phase failure line judging circuit, 3. disconnected zero line judging circuit, 4. disconnected zero line delay circuit, 5. two AND circuit, 6. three-phase and four-line measuring and monitoring device, the outage judging circuit in the VII. three-phase and four-line measuring and monitoring device.
Embodiment
In Fig. 4, the inverting input of the operational amplifier (IC4-2) in diode (D31) negative pole in the signal amplifier (1) and the disconnected zero line judging circuit (3) is electrically connected, the output terminal of the operational amplifier (IC4-2) in the disconnected zero line judging circuit (3) is connected with diode (D30) negative electricity of disconnected zero line delay circuit (4), diode (D29) negative pole of disconnected zero line delay circuit (4) is connected with diode (D17) negative electricity of amplitude discrimination circuit (V) in the three-phase and four-line measuring and monitoring device (6), the output terminal of the operational amplifier (IC4-4) in the phase failure line judging circuit (2) is connected with diode (D35) negative electricity of two AND circuit (5), diode (D34) negative pole of two AND circuit (5) is connected with diode (D32) negative electricity of outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6), diode (D33) negative pole of two AND circuit (5) is connected with diode (D14) negative electricity of outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6), diode (D16) negative pole of two AND circuit (5) is electrically connected in proper order with diode (D17) negative pole of the middle amplitude discrimination circuit (V) of three-phase and four-line measuring and monitoring device (6), and the inverting input of the operational amplifier (IC4-4) in the phase failure line judging circuit (2) is connected with diode (D18) negative electricity of outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6).
Claims (1)
1. anti-interference disconnection monitoring device, in metal shell, the inverting input of the operational amplifier (IC4-2) in diode (D31) negative pole in the signal amplifier (1) and the disconnected zero line judging circuit (3) is electrically connected, the output terminal of the operational amplifier (IC4-2) in the disconnected zero line judging circuit (3) is connected with diode (D30) negative electricity of disconnected zero line delay circuit (4), diode (D29) negative pole of disconnected zero line delay circuit (4) is connected with diode (D17) negative electricity of amplitude discrimination circuit (V) in the three-phase and four-line measuring and monitoring device (6), the output terminal of the operational amplifier (IC4-4) in the phase failure line judging circuit (2) is connected with diode (D35) negative electricity of two AND circuit (5), diode (D34) negative pole of two AND circuit (5) is connected with diode (D32) negative electricity of outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6), diode (D33) negative pole of two AND circuit (5) is connected with diode (D14) negative electricity of outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6), diode (D16) negative pole of two AND circuit (5) is electrically connected in proper order with diode (D17) negative pole of the middle amplitude discrimination circuit (V) of three-phase and four-line measuring and monitoring device (6), it is characterized in that: the inverting input of the operational amplifier (IC4-4) in the phase failure line judging circuit (2) is connected with diode (D18) negative electricity of outage judging circuit (VII) in the three-phase and four-line measuring and monitoring device (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620050048 CN2872375Y (en) | 2006-02-15 | 2006-02-15 | Anti-intrusion break monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620050048 CN2872375Y (en) | 2006-02-15 | 2006-02-15 | Anti-intrusion break monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2872375Y true CN2872375Y (en) | 2007-02-21 |
Family
ID=37740724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620050048 Expired - Fee Related CN2872375Y (en) | 2006-02-15 | 2006-02-15 | Anti-intrusion break monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2872375Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589008B (en) * | 2014-11-18 | 2019-02-19 | 德信东源电力技术服务（北京）有限公司 | Open phase fault detection method and device |
-
2006
- 2006-02-15 CN CN 200620050048 patent/CN2872375Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589008B (en) * | 2014-11-18 | 2019-02-19 | 德信东源电力技术服务（北京）有限公司 | Open phase fault detection method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070221 Termination date: 20100215 |