CN205229331U - Monitoring devices is gone into to dc bus alternating voltage of transformer substation cluster - Google Patents
Monitoring devices is gone into to dc bus alternating voltage of transformer substation cluster Download PDFInfo
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- CN205229331U CN205229331U CN201520933590.3U CN201520933590U CN205229331U CN 205229331 U CN205229331 U CN 205229331U CN 201520933590 U CN201520933590 U CN 201520933590U CN 205229331 U CN205229331 U CN 205229331U
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Abstract
The utility model discloses a monitoring devices is gone into to dc bus alternating voltage of transformer substation cluster for the dc bus monitoring facilities who solves each producer reforms transform or the substitute mode difference, leads to the replacement cost with high, long problem of time spent. The device includes: the alternating voltage module of sampling, CPU control module and report an emergency and ask for help or increased vigilance the module in proper order the order connect, alternating voltage sampling module includes separating straight circuit, voltage sampling circuit, voltage follower circuit, a rectification circuit, filter circuit and AD converting circuit order in proper order connect, AD converting circuit's output is connected with CPU control module's input, it includes blocking capacitance to separate straight circuit, blocking capacitance establishes ties in the dc bus rear end of awaiting measuring, voltage sampling circuit includes voltage transformer, voltage transformer establishes ties in separating straight circuit rear end, an exchange cluster income voltage and sample for treating in the survey dc bus. Above -mentioned device can exchange the monitoring warning of string income to the dc bus.
Description
Technical field
The utility model relates to substation safety checkout equipment field, particularly relates to a kind of transforming plant DC bus alternating voltage and seals in monitoring device.
Background technology
In electric system; direct supply is as the protection of secondary device in station, control, signal power source; vital effect is played to normal operation of the safety of equipment; but due to DC bus branch and connector lug many; very easily there is the AC in the DC system and cause protective device malfunction or tripping, or cause device in station to damage.Wherein, DC bus is for relay protection in transformer station, control, signal, aut.eq. and operation etc. provide reliable direct supply, is generally direct current 220 volts (V) or direct current 110V.Whether DC bus is reliably the guarantee that substation safety runs.Exchange to seal in and be used to indicate the phenomenon that AC compounent invades earth-free DC power system, make the AC compounent containing certain amplitude in straight-flow system, exchange when sealing in and very easily cause protective device malfunction, tripping, or device damages.
Interchange has sealed in following three kinds of forms: between positive bus-bar (+KM) and negative busbar (-KM), positive bus-bar (+KM) over the ground between, negative busbar (-KM) over the ground between.Cause exchange main cause that the interchange that seals in seals in have following some:
(1) direct-current secondary cable insulation damages, and causes the single-phase or two-phase of alternating voltage to seal in straight-flow system.
(2), in the work such as, technological transformation newly-built in transformer station, overhaul, site operation staff is by mistake by alternating current-direct current hybrid junction.
(3) some old transformer stations, Outdoor Terminal Case alternating current-direct current common terminal is arranged, and rainy day terminal box water inlet causes short circuit between interchange.
(4) in secondary cable ditch, alternating current-direct current cable is placed side by side, and when interchange secondary cable length is longer, and alternating current-direct current cable shield is all unearthed, causes ground capacitance excessive, and alternating voltage string is to direct current cables.
In September, 2012, State Grid Corporation of China formulated in " 18 great anti-accident measures of electrical network ", wherein, 5.1.1.18 bar is pointed out " being strictly on guard against that the AC in the DC fault occurs ", 15.7.20 finger goes out " in the management run and should strengthen straight-flow system in maintenance; strict implement respective rules, regulation and instead to arrange; prevent DC system fault, will prevent alternating voltage especially, electric current seals in DC loop, cause power grid accident.”
Existing transformer station is D.C. isolation monitoring device to the monitoring equipment of DC bus, device before formulating in September, 2012 " 18 great anti-accident measures of electrical network " is all without exchanging the monitoring function sealed in, nearly all to carry out transforming or change new equipment just can have interchange and seal in monitoring function, but the D.C. isolation monitoring equipment producer that transformer station uses is many, the direct current monitoring equipment of each producer adds the mode difference exchanging and seal in function, that changes costly, in a short time cannot transform, and equipment failure can be caused to result in greater loss.
Summary of the invention
The utility model embodiment provides a kind of transforming plant DC bus alternating voltage to seal in monitoring device, in order to solve in prior art exist DC bus monitoring equipment need transformation or more exchange device just can have and exchange the monitoring function that seals in, but due to the transformation of DC bus monitoring equipment or the substitute mode difference of each producer, cause renewal cost high, by the problem of duration.
The utility model embodiment provides a kind of transforming plant DC bus alternating voltage to seal in monitoring device, and this device comprises: alternating voltage sampling module, central processor CPU control module and alarm module, wherein, alternating voltage sampling module, CPU control module and alarm module are linked in sequence successively, alternating voltage sampling module comprises block isolating circuit, voltage sampling circuit, voltage follower circuit, rectification circuit, filtering circuit and modulus A/D convertor circuit, block isolating circuit, voltage sampling circuit, voltage follower circuit, rectification circuit, filtering circuit and A/D convertor circuit are linked in sequence successively, the output of A/D convertor circuit is connected with the input of CPU control module, block isolating circuit comprises capacitance, capacitance is connected on DC bus rear end to be measured, voltage sampling circuit comprises voltage transformer (VT), voltage mutual inductor serial is in block isolating circuit rear end, sample for sealing in voltage to the interchange in DC bus to be measured.
Preferably, alarm module comprises: LED alarm module, remote signalling warning module and buzzer warning module; Wherein, LED alarm module makes the triode ON of remote signalling warning module front end by photoelectrical coupler.
Preferably, this device also comprises: order load module, and its output terminal is connected with CPU control module, for sending command information to CPU control module; Display module, its input end is connected with CPU control module, for showing the monitoring information exchanging the situation that seals in DC bus to be measured; Power module, its output terminal connects alternating voltage sampling module, display module and alarm module.
The utility model beneficial effect comprises: achieve the monitoring, alarming function sealed in transformer station direct current system alternating voltage, substantially increase the operational reliability of straight-flow system, and each funtion part is modular design, it is convenient to change, and components and parts are withstand voltage higher, meet the requirement of safe and stable operation.This device adopts straight-flow system in station to power, stable work in work, and device has self test failure alarm function, can not impact other operational outfits in station.
Accompanying drawing explanation
Fig. 1 is the structural representation that transforming plant DC bus alternating voltage in the utility model embodiment seals in monitoring device;
Fig. 2 is the circuit diagram of the alternating voltage sampling module in the utility model embodiment;
Fig. 3 is the circuit diagram of LED alarm module and remote signalling warning module in the alarm module in the utility model embodiment;
Fig. 4 is the circuit diagram of the buzzer warning module in the utility model embodiment.
Embodiment
Monitoring device is sealed in order to provide a kind of special interchange; cheap; the direct current monitoring device of compatible all producers; each transformer station can be installed in a short time; to in DC bus exchange seal in carry out accurate measurements and and alarm; prevent malfunction or the tripping of protection; greatly improve the implementation of substation secondary device reliability of operation; the utility model embodiment provides a kind of transforming plant DC bus alternating voltage and seals in monitoring device, is described preferred embodiment of the present utility model below in conjunction with Figure of description.
Consult shown in Fig. 1, the utility model embodiment provides a kind of transforming plant DC bus alternating voltage to seal in monitoring device, and this device comprises: alternating voltage sampling module, central processor CPU control module and alarm module, wherein, alternating voltage sampling module, CPU control module and alarm module are linked in sequence successively, alternating voltage sampling module comprises block isolating circuit, voltage sampling circuit, voltage follower circuit, rectification circuit, filtering circuit and modulus A/D convertor circuit, block isolating circuit, voltage sampling circuit, voltage follower circuit, rectification circuit, filtering circuit and A/D convertor circuit are linked in sequence successively, the output of A/D convertor circuit is connected with the input of CPU control module, block isolating circuit comprises capacitance, capacitance is connected on DC bus rear end to be measured, voltage sampling circuit comprises voltage transformer (VT), voltage mutual inductor serial is in block isolating circuit rear end, sample for sealing in voltage to the interchange in DC bus to be measured.
Concrete, consult shown in Fig. 2, alternating voltage sampling module is sampled to the alternating voltage sealing in DC bus to be measured, is rectified into DC component afterwards.Alternating voltage sampling module is entered for preventing the DC voltage of DC bus, in first module of alternating voltage sampling module, block isolating circuit is connected capacitance C0 and C1 foremost, in voltage sampling circuit, have employed twin voltage mutual inductor and form difference channel, monitor positive bus-bar and negative busbar simultaneously, employing output-current rating is that the high-accuracy voltage mutual inductor of milliampere (mA) level carries out voltage sample, be voltage by milliampere level current transformation, voltage follow is carried out by high precision operating amplifier, operational amplifier becomes DC voltage through overcommutation device after exporting, A/D convertor circuit is exported to through filtering circuit after direct voltage output.Through experiment, adopt voltage transformer (VT), the mode of voltage follow, certain alternating voltage is inputted in straight-flow system, output terminal waveform is observed by oscillograph, following of waveform display alternating voltage is effective, without higher hamonic wave, DC component after rectifier exports is without the AC compounent of 50 hertz (Hz), and the output voltage of this alternating voltage sampling module differs less with theoretical value, and basic direct proportionality between input voltage, maximum error is only 4.65 percent, sampling precision is high, direct current output AC component is 0, without principal wave harmonic wave component, and be linear relationship between output and input voltage, alternating voltage sampling module use ± 12V direct supply.
CPU control module selects single-chip microcomputer STC89C52RC, and its I/O quantity can meet the needs of this device, is easy to programming, and periphery circuit design is simple, cheap.
Above-mentioned alarm module comprises three parts altogether: LED alarm module, remote signalling warning module and buzzer warning module.Consult shown in Fig. 3 and Fig. 4, LED alarm module makes the triode ON of remote signalling warning module front end by photoelectrical coupler, LED luminous alarm during warning.Being direct current 220V for meeting contact operating voltage, selecting driving voltage to be 24V direct current, the technical grade solid-state relay of contact operating voltage 250V; When there being interchange to seal in DC bus, when single-chip processor i/o exports and becomes low level from high level, photoisolator U4 conducting, makes triode ON, drives the 24V actuating of relay to realize remote signalling warning function; LED alarm, directly can be exported by single-chip processor i/o and drive; Buzzer warning in Fig. 4, by a triode amplifier conducting, drives hummer Speaker to report to the police.Isolated by photoisolator between+24V voltage and+5V voltage, without electrical link.
Transforming plant DC bus alternating voltage seals in monitoring device and also comprises: order load module, and its output terminal is connected with CPU control module, for sending command information to CPU control module, for device fixed value adjusting, and the functions such as programs menu selection; Display module, its input end is connected with CPU control module, for showing the monitoring information exchanging the situation that seals in DC bus to be measured; Power module, its output terminal connects alternating voltage sampling module, display module and alarm module.
Order load module can be keyboard or button.Device also comprises the shell of above-mentioned all module package.
In sum, the scheme that the utility model embodiment provides, achieve the monitoring, alarming function that transformer station direct current system alternating voltage is sealed in, substantially increase the operational reliability of straight-flow system, and each funtion part is modular design, it is convenient to change, and components and parts are withstand voltage higher, meet the requirement of safe and stable operation.This device adopts straight-flow system in station to power, and all can normally work under direct current 80-290V voltage, stable work in work, and device has self test failure alarm function, can not impact other operational outfits in station.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (3)
1. transforming plant DC bus alternating voltage seals in a monitoring device, it is characterized in that, described device comprises: alternating voltage sampling module, central processor CPU control module and alarm module, wherein, alternating voltage sampling module, CPU control module and alarm module are linked in sequence successively, alternating voltage sampling module comprises block isolating circuit, voltage sampling circuit, voltage follower circuit, rectification circuit, filtering circuit and modulus A/D convertor circuit, block isolating circuit, voltage sampling circuit, voltage follower circuit, rectification circuit, filtering circuit and A/D convertor circuit are linked in sequence successively, the output of A/D convertor circuit is connected with the input of CPU control module, block isolating circuit comprises capacitance, capacitance is connected on DC bus rear end to be measured, voltage sampling circuit comprises voltage transformer (VT), voltage mutual inductor serial is in block isolating circuit rear end, sample for sealing in voltage to the interchange in DC bus to be measured.
2. device as claimed in claim 1, it is characterized in that, alarm module comprises: LED alarm module, remote signalling warning module and buzzer warning module; Wherein, LED alarm module makes the triode ON of remote signalling warning module front end by photoelectrical coupler.
3. device as claimed in claim 1, it is characterized in that, described device also comprises: order load module, and its output terminal is connected with CPU control module, for sending command information to CPU control module; Display module, its input end is connected with CPU control module, for showing the monitoring information exchanging the situation that seals in DC bus to be measured; Power module, its output terminal connects alternating voltage sampling module, display module and alarm module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520933590.3U CN205229331U (en) | 2015-11-21 | 2015-11-21 | Monitoring devices is gone into to dc bus alternating voltage of transformer substation cluster |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520933590.3U CN205229331U (en) | 2015-11-21 | 2015-11-21 | Monitoring devices is gone into to dc bus alternating voltage of transformer substation cluster |
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| CN205229331U true CN205229331U (en) | 2016-05-11 |
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| CN201520933590.3U Expired - Fee Related CN205229331U (en) | 2015-11-21 | 2015-11-21 | Monitoring devices is gone into to dc bus alternating voltage of transformer substation cluster |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425068A (en) * | 2015-11-21 | 2016-03-23 | 国网宁夏电力公司宁东供电公司 | Substation direct-current bus alternating-current voltage serial-in monitoring device |
| CN106990306A (en) * | 2017-04-14 | 2017-07-28 | 国家电网公司 | A kind of transforming plant DC circuit test device |
| CN109375015A (en) * | 2018-10-30 | 2019-02-22 | 广州发展集团股份有限公司 | Drainage detection device and distance transmission system |
| CN110927439A (en) * | 2019-12-08 | 2020-03-27 | 国网河南省电力公司洛阳供电公司 | Voltage monitoring device for small bus tripping and disconnecting operation |
-
2015
- 2015-11-21 CN CN201520933590.3U patent/CN205229331U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425068A (en) * | 2015-11-21 | 2016-03-23 | 国网宁夏电力公司宁东供电公司 | Substation direct-current bus alternating-current voltage serial-in monitoring device |
| CN106990306A (en) * | 2017-04-14 | 2017-07-28 | 国家电网公司 | A kind of transforming plant DC circuit test device |
| CN109375015A (en) * | 2018-10-30 | 2019-02-22 | 广州发展集团股份有限公司 | Drainage detection device and distance transmission system |
| CN110927439A (en) * | 2019-12-08 | 2020-03-27 | 国网河南省电力公司洛阳供电公司 | Voltage monitoring device for small bus tripping and disconnecting operation |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |