CN201066371Y - A three-phase and three-line voltage loss judgment module - Google Patents
A three-phase and three-line voltage loss judgment module Download PDFInfo
- Publication number
- CN201066371Y CN201066371Y CNU200720111673XU CN200720111673U CN201066371Y CN 201066371 Y CN201066371 Y CN 201066371Y CN U200720111673X U CNU200720111673X U CN U200720111673XU CN 200720111673 U CN200720111673 U CN 200720111673U CN 201066371 Y CN201066371 Y CN 201066371Y
- Authority
- CN
- China
- Prior art keywords
- phase
- voltage
- decompression
- divider resistance
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses a three-phase three-wire voltage-losing judgement module, which includes three-phase judgement circuit branches, wherein, each circuit branch consists of a potential isolation diode, a resistor divider, a comparator and an AND gate; the diode is forwardly cascaded in the output circuit of the rectifier of the direct current supply of an electric energy meter, one end of the resistor divider is connected with the positive electrode of the potential isolation diode, the other end is grounded, and the control end is connected with the negative input end; the positive input end of the comparator is connected with a reference power supply; the input end of the AND gate is connected with the output ends of the comparators of the circuit branches of two neighboring phases, and the output end outputs voltage-losing judgement signals; the voltage of the reference power supply is slightly less than the voltage of the control end of the resistor divider. The utility model compares the voltage output by the rectifier of the direct current supply of the electric energy meter with a reference value, and then, by logic analysis, the voltage-losing phase is determined, thus realizing the purpose of voltage-losing judgement. The utility model has the advantages of low production cost, stable performance, high reliability, high speed and no false alarm.
Description
Technical field
The utility model relates to electronic electric energy meter and makes field, the online decompression judge module of specifically a kind of three-phase.
Background technology
Each large-scale power user electric quantity metering mode all adopts high voltage supply, " massive quantity power supply and measurement " mode of high pressure measurement both at home and abroad.As power department certain power consumer is adopted 10KV power supply, stoichiometric point just is located at the import of 10KV circuit, changes high-voltage signal the low voltage signal of 3 * 100V, 3 * 5A into voltage, current transformer, is input to electric energy meter again and goes to measure.This user's power is A phase current I
AWith AB phase voltage U
ABProduct, C phase current I
CWith CB phase voltage U
CBThe sum of products, that is: W=I
AU
AB+ I
CU
CB
When three-phase voltage is complete, U
AB=U
CB=U
CA=100V, when losing any phase voltage in the three-phase voltage, its actual conditions and pure theory analysis exist than big-difference.
Because in 10～35KV supply network, the voltage transformer (VT) mode of connection is Y/Y or V/V, there is not zero line output.And the voltage transformer secondary load is unbalanced, triangle is arranged, star is arranged, and incomplete star is also arranged.
In voltage transformer secondary voltage, lose any phase time, owing to " residual voltage " that the voltage transformer secondary laod unbalance causes, cause the line voltage of relevant phase non-vanishing, as A phase decompression, U
AB≠ U
AC≠ 0.So, be difficult to judge exactly the separate of decompression (phase failure) with the method for simple measuring voltage mutual inductor secondary voltage amplitude.
Voltage transformer secondary fuse opening (fault) or artificially remove voltage signal (stealing) and all can exert an influence to electric energy meter metering.Electric power enterprise is used parameters such as decompression is separate, decompression time, power factor according to relevant rules and rules, determines the electric weight that should remedy during the decompression.If to the decompression misjudgment, with the economic interests of damaging for the electricity consumption both sides.Therefore, electric energy meter must be rapid, accurate to decompression (phase failure) information judged.
The dc supply of existing electric energy meter is by three single phase poaer supply transformer T1, T2, T3, respectively from the voltage transformer secondary voltage U
AB, U
BC, U
CAIntroduce, after bridge rectifier Q1, Q2, Q3 rectification, directly send the mu balanced circuit module.Its principle of work is seen accompanying drawing 1.The mu balanced circuit module will be given electric energy meter as dc supply through the electric signal after the voltage stabilizing.
Electric energy meter judges that the principle of decompression (being the phase failure) information is basic identical both at home and abroad: set a threshold voltage (being threshold voltage), CPU regularly compares the voltage of measuring with threshold values, report to the police immediately when survey voltage is lower than threshold values.But do not have zero line in the phase three-wire three circuit, so can only be in the electric energy meter electronic circuit with B phase " altogether ".Therefore, three-phase three-wire electric energy meter can only provide U
AB, U
CBAnd U can't be provided
ACAmplitude.And the influence of incomplete and aforementioned " residual voltage " of information measurement is given according to " threshold values " and is judged that the method for decompression (phase failure) brings very big wrong report probability.Its another shortcoming is the judgement decompression modular circuit complex structure of electric energy meter, and cost is higher.
In addition, the timing ratio of CPU also determines the speed that decompression is reported to the police to the cycle.Therefore, should improve present design philosophy.
Summary of the invention
To be solved in the utility model is false alarm, passive warning (waiting for CPU is touring to be detected), circuit structure complexity, higher, the unmanageable problem of speed of cost that prior art exists, the decompression judge module of the three-phase three-wire electric energy meter of aim to provide that a kind of structure is simple relatively, cost is lower, dependable performance and speed are more superior.
The technical scheme that addresses the above problem employing is: a kind of phase three-wire three decompression judge module, comprise three-phase judgement branch road, described every branch road comprises a potential isolation diode, a divider resistance, a comparer and one and door, described diode forward is connected in series in the rectifier output circuit of electric energy meter dc supply, the positive pole of described divider resistance one termination potential isolation diode, other end ground connection, the input negative terminal of control termination comparer; The positive termination reference power supply of the input of described comparer; The output terminal of comparer of the adjacent two-phase branch road of input termination of described and door, its output terminal output decompression is judged signal; Described reference power supply is a little less than the control end voltage of divider resistance.
Because electric network fault can cause that usually the voltage that is delivered to the user significantly falls, electricity filching behavior is also like this.So needn't pursue the precision that magnitude of voltage is measured to the judgement of decompression, but require information complete, be convenient to analyze.And decompression judge module of the present utility model adopts simple circuit configuration, with the voltage of the rectifier output of electric energy meter dc supply and reference value relatively, again by logic analysis, to judge decompression separate, thereby reached the purpose of decompression judgement.And the utility model cost is lower, stable performance, and the reliability height, speed is fast, and can initiatively report decompression information, can not produce false alarm.
As further improvement of the utility model, described reference power supply be divider resistance control end voltage 0.8～0.85, what make that decompression judges is more accurate, reliably.
Large-scale electric equipment drops into, and may cause the line voltage momentary fluctuation, so the suitable electric capacity in parallel of each divider resistance two end guarantees that the time constant of RC can reliably be avoided voltage fluctuation time Δ τ, suggestion Δ τ was greater than 2 seconds.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the circuit diagram of existing electric energy meter dc supply.
Fig. 2 is the circuit diagram of the utility model phase three-wire three decompression judge module.
Fig. 3 is the circuit diagram of the embodiment of the utility model band divider resistance two ends shunt capacitance.
Embodiment
With reference to Fig. 1, the circuit diagram of existing electric energy meter dc supply, be made of three single phase poaer supply transformer T1, T2, T3 and three-phase bridge rectifier Q1, Q2, Q3, the input end of three single phase poaer supply transformer T1, T2, T3 meets threephase potential transformer secondary voltage U respectively
AB, U
BC, U
CA, the output termination mu balanced circuit module of three-phase bridge rectifier Q1, Q2, Q3.
With reference to Fig. 2, phase three-wire three decompression judge module of the present utility model comprises triphasic potential isolating diode D1, D2, D3, three-phase divider resistance R1, R2, R3, three comparer B1, B2, B3 and three and door Y1, a Y2, Y3.Described three-phase diode D1, D2, D3 forward are connected in series in the rectifier output circuit of electric energy meter dc supply, described divider resistance R1, R2, R3 one end connect the positive pole 3,1,5 of potential isolation diode D2, D1, D3 respectively, other end ground connection, the input negative terminal of control termination comparer B1, B2, B3; The positive termination reference power supply of the input E of described comparer B1, B2, B3; The output terminal of the comparer of the adjacent two-phase branch road of input termination of described and door Y1, a Y2, Y3, its output terminals A, B, C output decompression are judged signal; 0.8～0.85 of the control end voltage that described reference power supply E is a divider resistance.
Principle of work of the present utility model is as follows:
Because the effect of potential isolation diode D1, D2, D3, when a certain phase decompression took place, the sampling spot 1,3,5 of bridge rectifier voltage can reflect the alternating voltage situation that inputs to electric energy meter strictly according to the facts.
When the circuit operate as normal, direct current benchmark voltage E is 80%～85% of voltage sampling point 1,3,5 normal voltage values, comparer B
1, B
2, B
3Output low level " 0 ", therefore, with door Y
1, Y
2, Y
3Also output low level " 0 ".
When certain phase decompression (establishing the A phase), relevant phase voltage descends (decline of sampling spot 1,3 voltages), two comparer action B
1, B
2, open (Y with door for one
1), output high level " 1 ", decompression (A phase) takes place in prompting.
With reference to Fig. 3, another embodiment of the present utility model is that with last embodiment difference all the other structures are identical with last embodiment at the two ends of each divider resistance R1, R2, a R3 difference capacitor C 1 in parallel, C2, C3.By regulating the response speed of shunt capacitance C1, C2, C3 adjustable circuit.
What should be understood that is: the foregoing description is just to explanation of the present utility model, rather than to restriction of the present utility model, any innovation and creation that do not exceed in the utility model connotation scope all fall within the protection domain of the present utility model.
Claims (4)
1. phase three-wire three decompression judge module, comprise three-phase judgement branch road, it is characterized in that described every branch road comprises a potential isolation diode (D1, D2, D3), a divider resistance (R1, R2, R3), a comparer (B1, B2, B3) and one with the door (a Y1, Y2, Y3), described diode (D1, D2, D3) forward is connected in series in the rectifier output circuit of electric energy meter dc supply, described divider resistance (R1, R2, R3) a termination potential isolation diode (D2, D1, D3) positive pole, other end ground connection, control termination comparer (B1, B2, B3) input negative terminal; The positive termination reference power supply of input (E) of described comparer (B1, B2, B3); The output terminal of comparer of the adjacent two-phase branch road of input termination of described and door (Y1, Y2, Y3), its output terminal (A, B, C) output decompression is judged signal; Described reference power supply (E) is a little less than the control end voltage of divider resistance.
2. phase three-wire three decompression judge module as claimed in claim 1, it is characterized in that described reference power supply be divider resistance control end voltage 0.8～0.85.
3. phase three-wire three decompression judge module as claimed in claim 1 or 2 is characterized in that described each divider resistance (R1, R2, R3) two ends electric capacity (C1, C2, C3) all in parallel.
4. phase three-wire three decompression judge module as claimed in claim 3, the time constant (Δ τ) that it is characterized in that described divider resistance (R1, R2, R3) and electric capacity (C1, C2, C3) shunt circuit was greater than 2 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720111673XU CN201066371Y (en) | 2007-07-06 | 2007-07-06 | A three-phase and three-line voltage loss judgment module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720111673XU CN201066371Y (en) | 2007-07-06 | 2007-07-06 | A three-phase and three-line voltage loss judgment module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201066371Y true CN201066371Y (en) | 2008-05-28 |
Family
ID=39483554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720111673XU Expired - Fee Related CN201066371Y (en) | 2007-07-06 | 2007-07-06 | A three-phase and three-line voltage loss judgment module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201066371Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611105A (en) * | 2012-03-16 | 2012-07-25 | 刘春元 | Large-area illumination electric distribution method and induction electric taking units of large-area illumination electric distribution method |
| CN109212451A (en) * | 2018-09-26 | 2019-01-15 | 深圳供电局有限公司 | No-voltage fault monitoring method and device based on three-phase and four-line meter equipment |
| CN109375145A (en) * | 2018-09-26 | 2019-02-22 | 深圳供电局有限公司 | No-voltage fault monitoring method and device based on phase three-wire three meter equipment |
| TWI806252B (en) * | 2021-01-18 | 2023-06-21 | 日商住友重機械工業股份有限公司 | Rectifier and laser power supply unit |
-
2007
- 2007-07-06 CN CNU200720111673XU patent/CN201066371Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611105A (en) * | 2012-03-16 | 2012-07-25 | 刘春元 | Large-area illumination electric distribution method and induction electric taking units of large-area illumination electric distribution method |
| CN109212451A (en) * | 2018-09-26 | 2019-01-15 | 深圳供电局有限公司 | No-voltage fault monitoring method and device based on three-phase and four-line meter equipment |
| CN109375145A (en) * | 2018-09-26 | 2019-02-22 | 深圳供电局有限公司 | No-voltage fault monitoring method and device based on phase three-wire three meter equipment |
| CN109212451B (en) * | 2018-09-26 | 2021-06-25 | 深圳供电局有限公司 | Voltage loss fault monitoring method and device based on three-phase four-wire meter measuring equipment |
| TWI806252B (en) * | 2021-01-18 | 2023-06-21 | 日商住友重機械工業股份有限公司 | Rectifier and laser power supply unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ciobotaru et al. | Line impedance estimation using model based identification technique | |
| CN106249063B (en) | A kind of three-phase alternating-current supply phase sequence lack detection circuit and method | |
| CN104777397A (en) | Distribution line single-phase break line judgment and positioning method based on line voltage vector criterion | |
| CN101216503A (en) | Hierarchical type electricity anti-theft system and method | |
| AU2011371437B2 (en) | Electric energy meter on-line detection method | |
| CN202522633U (en) | Three-phase voltage open-phase detection circuit of system without zero line | |
| CN101696996B (en) | Pulse width signal duty factor detector | |
| CN103954883A (en) | Voltage transformer secondary connection inspecting method and device | |
| CN201066371Y (en) | A three-phase and three-line voltage loss judgment module | |
| CN108732511A (en) | A kind of insulating resistor detecting circuit and detection method of DC power system | |
| CN203811727U (en) | Device for detecting commercial power | |
| CN111413643A (en) | Power distribution network single-phase earth fault identification method | |
| CN103018621A (en) | Direct current insulation monitoring module based on 24V power system and achieving method thereof | |
| CN103076477A (en) | On-line monitoring method of secondary side shunt electric stealing of CT (current transformer) of 10kV special variable metering device | |
| CN101776723A (en) | Method for detecting earth fault of direct current system by utilizing frequency deviation method | |
| CN110988779A (en) | Method and system for detecting zero line lacking function of three-phase four-wire electric energy meter | |
| CN102621404A (en) | Lacking phase detecting circuit for three-phase voltage of system without zero lines | |
| CN102590698A (en) | Small current grounding line selection device and control method of voltage disturbance locked line selection | |
| CN103941197A (en) | Monitoring device and method for direct-current power source complete equipment ripple factor | |
| CN201589839U (en) | Integrated device for inspecting ground fault of direct-current system | |
| Liu et al. | Insulation fault detection circuit for ungrounded DC power supply systems | |
| CN201528321U (en) | Pulse-width signal duty ratio detector | |
| CN202929082U (en) | Circuit used in intelligent electric energy meter for preventing current sampling offset | |
| CN202153239U (en) | Differential phasor detection apparatus | |
| CN205643677U (en) | Hand -held type current transformer voltage -current characteristic tester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080528 Termination date: 20150706 |
|
| EXPY | Termination of patent right or utility model |