CN202870201U - Power alternating-current/direct-current power supply mixed connection microcomputer monitoring and protection device - Google Patents
Power alternating-current/direct-current power supply mixed connection microcomputer monitoring and protection device Download PDFInfo
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- CN202870201U CN202870201U CN 201220497239 CN201220497239U CN202870201U CN 202870201 U CN202870201 U CN 202870201U CN 201220497239 CN201220497239 CN 201220497239 CN 201220497239 U CN201220497239 U CN 201220497239U CN 202870201 U CN202870201 U CN 202870201U
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Abstract
The utility model discloses and provides a power alternating-current/direct-current power supply mixed connection microcomputer monitoring and protection device which is applicable to different alternating-current and direct-current power supply systems and is capable of timely monitoring electricity mixing state and detecting insulation condition and assisting in preventing large-area serious power outage caused by damage on electric equipment, protective relaying misoperation, shut down of a generator, tripping of a high-voltage circuit breaker. The power alternating-current/direct-current power supply mixed connection microcomputer monitoring and protection device comprises a main control CPU, an A/D conversion unit, a storage unit, an upper communication unit and a relay unit which are electrically connected with the main control CPU, a signal modulation unit connected with the A/D conversion unit, and a signal acquisition unit connected with the signal modulation unit; and after passing through the signal modulation unit and the A/D conversion unit, the signals of the signal acquisition unit are transmitted to the main control CPU.
Description
Technical field
The utility model relates to a kind of electric power power of alterating and direct current crosstalk microcomputer monitoring protective device.
Background technology
In generating plant, transformer station, industrial and mining enterprises' electric equipment operation, equipment is various, number of cables is many and complex distribution for AC power (380V/220V) and direct supply (220V, 110V, 48V, 24V).In the field apparatus operational process, because cable bad (damage, defective insulation, water enchroachment (invasion) etc.), equipment all can cause straight-flow system to seal in interchange effective constituent in roof leaking or insulation ag(e)ing, maintenance process mis-wired.For many years, the phenomenon of the mutual crosstalk in power of alterating and direct current secondary power supply loop happens occasionally, slight meeting cause damage of equipment, serious meeting causes the accident of the serious large-area power-cuts such as protective relaying maloperation, generator force outage, transformer station's primary cut-out tripping operation, as: 2 circuit primary cut-out tripping operations of certain 500KV transformer station; Compressor emergency shutdown and the tripping operation of circuit primary cut-out occur in certain 4 * 300MW thermal power plant; 4 600MW compressor emergency shutdowns of certain large thermal power plant and 2 main transformer circuit breaker trips; Certain 600MW of power plant unit causes excitation system degaussing switch false tripping and unit failure to stop transport because sealing in the straight-flow system to exchange.At present; for these serious problems of power of alterating and direct current crosstalk; there is no both at home and abroad crosstalk character, crosstalk classification of living in, and the Microcomputer Protection product of applicable five kinds of earthing modes and multiple voltage grade direct supply can the Real-Time Monitoring crosstalk occur, differentiate; therefore, this just exists certain weak point.
The utility model content
The utility model provides a kind of applicable different alterating and direct current origin systems; but Real-Time Monitoring crosstalk state and detect insulation status prevents the electric power power of alterating and direct current crosstalk microcomputer monitoring protective device of the generation of the large area blackout that electrical equipment damage, protective relaying maloperation, generator outage, primary cut-out tripping operation etc. are serious.
The technical scheme that the utility model adopts is: the utility model comprises master cpu, the A/D converting unit that is electrically connected with described master cpu, storage unit, upper communication unit and the signal modulating unit that is connected with described A/D converting unit, the signal gathering unit that is connected with described signal modulating unit, the signal of described signal gathering unit collection is transferred to described master cpu after by described signal modulating unit and described A/D converting unit, described master cpu calculates rear differentiation crosstalk character to the signal that collects, crosstalk classification of living in, the crosstalk orientation, and deposit described storage unit in and send a warning with database mode.
Described electric power power of alterating and direct current crosstalk microcomputer monitoring protective device also comprises relay unit, display unit, keyboard operation unit, the hummer that is electrically connected with described master cpu.
The beneficial effects of the utility model are: because the utility model comprises master cpu; the A/D converting unit that is electrically connected with described master cpu; storage unit; upper communication unit and the signal modulating unit that is connected with described A/D converting unit; the signal gathering unit that is connected with described signal modulating unit; the signal of described signal gathering unit collection is transferred to described master cpu after by described signal modulating unit and described A/D converting unit; described master cpu calculates rear differentiation crosstalk character to the signal that collects; crosstalk classification of living in; the crosstalk orientation; and deposit described storage unit in and send a warning with database mode; so; when crosstalk occurring between ac and dc systems; differentiate crosstalk character; crosstalk classification of living in; the crosstalk orientation; detect insulation status between two systems; send in real time trouble-signal and notify applying unit to investigate and prosecute rapidly the crosstalk point, prevent that electrical equipment from damaging; protective relaying maloperation; generator outage; the generation of the large area blackout that primary cut-out tripping operation etc. are serious.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the module frame chart of the utility model master cpu
Fig. 3 is the utility model electrical connection theory diagram;
Fig. 4 is terminal connection diagram of the present utility model.
Embodiment
Such as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the utility model is stated electric power power of alterating and direct current crosstalk microcomputer monitoring protective device and is comprised master cpu 1, A/D converting unit 2, storage unit 3, upper communication unit 4, relay unit 5, signal modulating unit 6, signal gathering unit 7, display unit 9, keyboard operation unit 10, hummer 11, described A/D converting unit 2, described storage unit 3, upper communication unit 4, relay unit 5, described display unit 9, described keyboard operation unit 10, described hummer 11 all is electrically connected with described master cpu 1, described signal modulating unit 6 is connected with described A/D converting unit 2, after the modulation of signal by described signal modulating unit 6 that described signal gathering unit 7 gathers, after the digital-to-analog conversion of described A/D converting unit 2, upload to described master cpu 1, described CPU1 comprises signal sampling computing module 104, is used for receiving signal that described signal gathering unit 7 collects and carries out AC sampling and calculate, the direct current sampling is calculated, the neutral-point solid ground mode is calculated, the isolated neutral mode is calculated, the neutral by arc extinction coil grounding mode is calculated, the Neutral Point Through Low Resistance mode is calculated, neutral point calculates through large resistance earthing; Judge and analysis module 105, be used for the data that calculate from described signal sampling computing module are differentiated crosstalk character, crosstalk classification of living in, crosstalk orientation, it specifically comprises straight string criterion, leaks string criterion, positive bus-bar crosstalk criterion, control bus crosstalk criterion, negative busbar crosstalk criterion, frequency analysis, Anomaly criterion, and deposits described storage unit in and send a warning with database mode; Communications Processor Module 101 is used for described electric power power of alterating and direct current crosstalk microcomputer monitoring protective device and sets up communication link by network mode and background host computer; Function management and configuration module 102 are used for configuring described electric power power of alterating and direct current crosstalk microcomputer monitoring protective device, will communicate by letter and the parameter such as monitoring target is configured; Password authentication module 103; be used for authorizing different administration authorities for the user who uses described electric power power of alterating and direct current crosstalk microcomputer monitoring protective device, described master cpu 1 also comprises on-line testing (KX+B) module 108, date and time administration module 109, debugging module 110, the definite value setting module 111 of data memory module 106, relay control module 107, real time data.
Connection terminal comprises J1 terminal, J2 terminal, J3 terminal, J4 terminal; Wherein
The J1 terminal
:
J1-1: the earth J1-2: empty J1-3: close mother+
J1-4: empty J1-5: control mother+J1-6: sky
J1-7: negative female
The J2 terminal:
J2-1: isolated neutral N line; J2-2: neutral ground N line;
J2-3: neutral by arc extinction coil grounding N line J2-4: neutral point is through large resistance eutral grounding N line;
J2-5: Neutral Point Through Low Resistance N line
The J3 terminal:
J3-1～J3-2: crosstalk warning dry contact output 1(contact rating AC220V/5A)
J3-3～J3-4: crosstalk warning dry contact output 2(contact rating AC220V/5A)
J3-5～J3-6: not enabled relay dry contact output (contact rating AC220V/5A)
J3-7～J3-8: not enabled relay dry contact output (contact rating AC220V/5A)
The J4 terminal:
J4-1: programming; J4-2: programming ground J4-3: not enabled; J4-4: communicatedly
J4-5：RS232-TXD J4-6：RS232-RXD J4-7：422Y J4-8：422Z
J4-9：422B/485B0 J4-10：422A/485A0 J4-11：485B1 J4-12：485A2
Its principle of work is: according to the electric pressure of neutral grounding mode and the ac and dc systems of factory setting; move its corresponding application program; real time high-speed gathers running status and the micro-signal effective ingredient of ac and dc systems; the operation conditions of computational analysis ac and dc systems; when crosstalk occurring between ac and dc systems; differentiate crosstalk character; crosstalk classification of living in; the crosstalk orientation; detect insulation status between two systems; send in real time trouble-signal (OLCD; LED; relay; distant place communication); the notice applying unit is investigated and prosecuted rapidly the crosstalk point, prevents that electrical equipment from damaging; protective relaying maloperation; generator outage; the generation of the large area blackout that primary cut-out tripping operation etc. are serious.
The scope of application: the utility model power of alterating and direct current crosstalk microcomputer monitoring protective device, the AC power supply system of applicable five kinds of different AC transformer neutral grounding modes and all occasions of the direct supply (220V, 110V, 48V, 24V) of different electric pressures.
The target that realizes: but crosstalk character, crosstalk classification of living in, crosstalk orientation occur, differentiate in the Real-Time Monitoring crosstalk; detect insulation status between two systems; send in real time trouble-signal; the notice applying unit is investigated and prosecuted rapidly the crosstalk point, prevents the generation of the large area blackout that electrical equipment damage, protective relaying maloperation, generator force outage, primary cut-out tripping operation etc. are serious.
Propose also to have introduced this concept: crosstalk character, metallicity crosstalk, nonmetal crosstalk, straight string, leak string, just (+) bus crosstalk, negative (-) bus crosstalk, just go here and there, negatively go here and there, crosstalk microcomputer monitoring protective device.
Crosstalk character refers to the crosstalk type of attachment between power of alterating and direct current, is divided into the metallicity connection and is connected with nonmetal character.The metallicity crosstalk refers to that the resistance between power of alterating and direct current is close to zero (＜=0.01 Ω), being equivalent to two cover power-supply system metallicity connects, the voltage of AC power supply system fully is added on the DC power system, and the crosstalk mode under this situation is referred to as the metallicity crosstalk.Nonmetal crosstalk refers to the resistance between power of alterating and direct current non-vanishing (〉 0.01 Ω), being equivalent to two cover power-supply systems connects through the resistance of certain value, the voltage of AC power supply system is removed on the DC power system that fully is added to after the pressure drop on the contact resistance, and the crosstalk mode under this situation is referred to as the nonmetal character crosstalk.Straight string refers to the abbreviation of metallicity crosstalk.Leak the abbreviation that string refers to the nonmetal character crosstalk.Just the crosstalk of (+) bus refers to that the voltage of AC power supply system seals in just (+) bus of DC power system.The crosstalk of control (KM) bus refers to that the voltage of AC power supply system seals in the control of DC power system (KM) bus.Negative (-) bus crosstalk refers to that the voltage of AC power supply system seals in negative (-) bus of DC power system.Just going here and there the abbreviation of (+) bus crosstalk of making a comment or criticism.The control string is accused the abbreviation of system (KM) bus crosstalk.Negative string refers to bear the abbreviation of (-) bus crosstalk.Crosstalk microcomputer monitoring protective device refers to implement to monitor the whether Computerized monitor system of crosstalk of power of alterating and direct current system running state.
Service condition: height above sea level is no more than 3500m; Environment for use temperature-25 ℃ ~ 45 ℃; Ambient humidity＜90%; Environment for use requires indoor and well-ventilated; Environment for use is without conduction or explosive dust and non-corrosiveness gas; Mounting foundation is without high vibration and impact.
Technical indicator:
● measuring accuracy: 0.1%
● metering system: in real time AC sampling, in real time direct current sampling
● frequency measurement scope: 1～65Hz
● working power: DC220V ± 30%; DC110V ± 30%; DC48V ± 30%; DC24V ± 30%
● work power consumption: less than 3W
● time setting: 40ms ~ 10s
● device insulation resistance: greater than 100 megaohms
● device dielectric strength: 3KV, 1min
● EMC esd immunity: 8kV 10 times
● EMC electromagnetic field of high frequency immunity to interference: 80～100MHz; 10V/m
● EMC electrical fast transient (eft): 4Kv 60s
● EMC fast transient immunity to interference: 1.2/50 μ s; 4KV
Claims (2)
1. electric power power of alterating and direct current crosstalk microcomputer monitoring protective device; it is characterized in that: described electric power power of alterating and direct current crosstalk microcomputer monitoring protective device comprises master cpu (1); the A/D converting unit (2) that is electrically connected with described master cpu (1); storage unit (3); upper communication unit (4) and the signal modulating unit (6) that is connected with described A/D converting unit (2); the signal gathering unit (7) that is connected with described signal modulating unit (6); the signal that described signal gathering unit (7) gathers is transferred to described master cpu (1) after by described signal modulating unit (6) and described A/D converting unit (2); described master cpu (1) calculates rear differentiation crosstalk character to the signal that collects; crosstalk classification of living in; the crosstalk orientation, and deposit described storage unit (3) in and send a warning with database mode.
2. electric power power of alterating and direct current crosstalk microcomputer monitoring protective device according to claim 1, it is characterized in that: described electric power power of alterating and direct current crosstalk microcomputer monitoring protective device also comprises relay unit (5), display unit (9), keyboard operation unit (10), the hummer (11) that is electrically connected with described master cpu (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220497239 CN202870201U (en) | 2012-09-26 | 2012-09-26 | Power alternating-current/direct-current power supply mixed connection microcomputer monitoring and protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220497239 CN202870201U (en) | 2012-09-26 | 2012-09-26 | Power alternating-current/direct-current power supply mixed connection microcomputer monitoring and protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202870201U true CN202870201U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220497239 Expired - Fee Related CN202870201U (en) | 2012-09-26 | 2012-09-26 | Power alternating-current/direct-current power supply mixed connection microcomputer monitoring and protection device |
Country Status (1)
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|---|---|
| CN (1) | CN202870201U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116352A (en) * | 2015-09-01 | 2015-12-02 | 国网辽宁省电力有限公司鞍山供电公司 | Mixed connection detection method of two sets of direct-current power supply systems of transformer substation |
-
2012
- 2012-09-26 CN CN 201220497239 patent/CN202870201U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116352A (en) * | 2015-09-01 | 2015-12-02 | 国网辽宁省电力有限公司鞍山供电公司 | Mixed connection detection method of two sets of direct-current power supply systems of transformer substation |
| CN105116352B (en) * | 2015-09-01 | 2018-06-26 | 国网辽宁省电力有限公司鞍山供电公司 | The double set DC power system string electro-detection methods of substation |
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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: 20130410 Termination date: 20140926 |
|
| EXPY | Termination of patent right or utility model |