CN204258281U - Overvoltage bypass checkout gear - Google Patents
Overvoltage bypass checkout gear Download PDFInfo
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- CN204258281U CN204258281U CN201420813883.3U CN201420813883U CN204258281U CN 204258281 U CN204258281 U CN 204258281U CN 201420813883 U CN201420813883 U CN 201420813883U CN 204258281 U CN204258281 U CN 204258281U
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Abstract
The utility model discloses a kind of overvoltage bypass checkout gear, be electrically connected trigger module (11), for detecting the working condition of trigger module (11), described checkout gear comprises: supply unit (10), be connected in parallel, for providing charge power supply with described trigger module (11); Capacitance module (12), the electric energy for receiving described supply unit (10) carries out charging or electric discharge after described supply unit (10) stops charging; And current limliting module (13), be electrically connected described supply unit (10) and capacitance module (12), for limiting described capacitance module (12) electric current in charge or discharge process.The utility model overvoltage bypass checkout gear, by detecting the voltage status of described capacitance module and current limliting module two ends, accurately can judge whether described trigger module can normally work, and highly sensitive, reliability is strong; Adopt many loops, the electric charge in time on release capacitance module, can improve the fail safe of operation simultaneously.
Description
Technical field
The utility model relates to a kind of voltage check device, particularly, relates to a kind of overvoltage bypass checkout gear.
Background technology
Along with the development of extra-high voltage direct-current transmission technology, the extra-high voltage direct-current transmission circuit that puts into operation gets more and more, and the impact of extra-high voltage direct-current transmission on AC system is more and more obvious.One of them major effect is when the operation of DC power transmission line one pole the earth or two-phase unbalanced operation, and the earth can as an electric current return loop, and now direct current understands some AC transformer by neutral ground inflow AC system.After direct current flows into AC transformer, transformer can produce DC magnetic bias phenomena, affects the safe and stable operation of transformer.
The impact receiving D.C. magnetic biasing all in various degree of power plant in recent years near DC power transmission line earth electrode, transformer station.Transformer neutral point DC current restraining device disclosed in Chinese patent publication No. CN103683194A can solve the problem of transformer DC magnetic bias.As shown in Figure 1, when normally working, described restraining device is that neutral point is run by partiting dc capacitor 1 ground connection.But when equipment breaks down, when overvoltage trigger element 5 detects that the commutating voltage that rectifier bridge 3 exports is excessive, thyristor 4 triggering and conducting, tripping coil 6 is obtained electric, the then normally opened contact rapid closing of fast combination switch 2, now partiting dc capacitor 1 is by the short circuit of fast combination switch 2, and transformer neutral point N, by fast combination switch 2 ground connection, exits partiting dc capacitor 1 automatically.Portable protective gaps 7 is in parallel with partiting dc capacitor 1, and portable protective gaps 7 can play the effect preventing transformer neutral point overtension.
But described restraining device does not need trigger module (described trigger module comprises thyristor 4 and overvoltage trigger element 5) to put into operation when normal operation, only have when the equipment Shi Caixu that breaks down makes described trigger module work.If equipment breaks down, when simultaneously described trigger module cannot normally work again, then there will be to whole restraining device even whole system all produce immeasurable serious consequence, cause great economic loss.
Utility model content
The purpose of this utility model is to provide a kind of overvoltage bypass checkout gear, and this device can produce overvoltage phenomenon, thus judges whether trigger module can normally work.
To achieve these goals, the utility model provides a kind of overvoltage bypass checkout gear, and be electrically connected supply unit, described checkout gear comprises: supply unit, is connected in parallel with described trigger module, for providing charge power supply; Capacitance module, the electric energy for receiving described supply unit carries out charging or electric discharge after described supply unit stops charging; And current limliting module, be electrically connected described supply unit and capacitance module, for limiting the electric current of described capacitance module in charge or discharge process.
Preferably, described checkout gear also comprises: module of releasing, and is connected in parallel with described capacitance module, for the electric charge at described capacitance module two ends of releasing.
Preferably, module of releasing described in is the first resistance.
Preferably, described capacitance module is capacitor.
Preferably, described current limliting module is the second resistance.
The utility model overvoltage bypass checkout gear can produce overvoltage phenomenon in current limliting module and capacitance module two ends, and judge that can trigger module normally work with this, promptly and accurately, highly sensitive, reliability is strong; The utility model overvoltage bypass checkout gear forms multiple circuit, and the electric charge in time on release capacitance module, guarantees use safety and the handling safety of components and parts in circuit.And the utility model overvoltage bypass structure of the detecting device is simple, easy to operate.
Other features and advantages of the utility model are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is transformer neutral point DC current restraining device.
Fig. 2 is the modular structure schematic diagram of the utility model overvoltage bypass checkout gear.
Fig. 3 is the embodiment of the circuit structure of the utility model overvoltage bypass checkout gear.
Description of reference numerals
The fast combination switch of 1 partiting dc capacitor 2
3 rectifier bridge 4 thyristors
The de-mouthful coil of 5 overvoltage trigger element 6
7 portable protective gaps 10 supply units
11 trigger module 111 thyristors
112 overvoltage trigger element 12 capacitance modules
121 capacitor 13 current limliting modules
131 second resistance 14 are released module
141 first resistance.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
As shown in Figure 2, the utility model overvoltage bypass checkout gear, is electrically connected trigger module 11, for detecting the working condition of described trigger module 11.The utility model checkout gear comprises supply unit 10, is connected in parallel, for providing charge power supply with described trigger module 11; Capacitance module 12, the electric energy for receiving described supply unit 10 carries out charging or electric discharge after described supply unit 10 stops charging; And current limliting module 13, be electrically connected described supply unit 10 and capacitance module 12, for limiting the electric current of described capacitance module 12 in charge or discharge process.
Wherein, described supply unit 10 comprises experiment power supply and controls the mains switch of described experiment power supply work.When described experiment power supply carries out charging work, described mains switch need be closed, when described experiment power supply stops charging work, disconnect described mains switch.
Described experiment power supply is in the process of charging to described capacitance module 12, if described trigger module 11 cisco unity malfunction, then no matter how long experiment power supply continues charging, and described trigger module 11 all can not detect the overvoltage phenomenon at described capacitance module 12 and current limliting module 13 two ends.If trigger module 11 can normally work, then described trigger module 11 can continue the overvoltage phenomenon that can detect described capacitance module 12 and current limliting module 13 both end voltage in the process of charging in time at described experiment power supply.
That is: when the voltage at described capacitance module 12 and current limliting module 13 two ends is less than the trigger voltage of described trigger module 11, described experiment power supply charges to described capacitance module 12, described capacitance module 12 two ends stored charge.Wherein, described current limliting module 13, as energy dissipation device, consumes the electric energy of described experiment power supply, to limit the charging current of described capacitance module 12, prevents electric current excessive, damages other components and parts.
When the voltage at described capacitance module 12 and current limliting module 13 two ends is greater than the trigger voltage of described trigger module 11, described trigger module 11 triggering and conducting, disconnect described mains switch, described experiment power supply exits charging work, and charging terminates.Meanwhile, the conducting of described trigger module 11, i.e. the series loop conducting of described trigger module 11, capacitance module 12 and current limliting module 13 formation, described capacitance module 12 discharges.The conducting of described trigger module 11 shows that by the voltage at described capacitance module 12 and current limliting module 13 two ends be overvoltage.Wherein, described current limliting module 13, as energy dissipation device, consumes the electric energy of described capacitance module 12 release, is limited in electric current in discharge process, to prevent electric current excessive, damages other components and parts.
Wherein, in the present embodiment, described capacitance module 12 is capacitor 121, and described current limliting module 13 is the second resistance 131 (as shown in Figure 3).
While trigger module 11 triggering and conducting, send alarm signal, the testing result that notice person skilled trigger module 11 can normally work.
Wherein, as shown in Figure 3, described trigger module 11 comprises thyristor 111, for controlling the conducting of the series loop formed by the second resistance 131, capacitor 121 and thyristor 111; Overvoltage trigger element 112, is electrically connected with described thyristor 111, for controlling the break-make of described thyristor 111, sending alarm signal and control the conducting of described thyristor 111 when described overvoltage trigger element 112 detects overvoltage.
When the voltage at described capacitance module 12 and current limliting module 13 two ends is greater than the trigger voltage of overvoltage trigger element 112, described overvoltage trigger element 112 controls thyristor 111 triggering and conducting, disconnect described mains switch, make the charging work of described experiment power supply stopping to described capacitance module 12, and described overvoltage trigger element 112 sends alarm signal, reminds person skilled in time.
As shown in Figure 2, the utility model overvoltage bypass checkout gear also comprises module 14 of releasing, and is connected in parallel with described capacitance module 12, for the electric charge at described capacitance module 12 two ends of releasing.When described trigger module 11 does not have triggering and conducting, described module 14 of releasing is as partial pressure device, the voltage of experiment power supply is jointly obtained with described current limliting module 13, the voltage being applied to described capacitance module 12 two ends can be controlled, thus can avoid because of overtension, puncture described capacitance module 12, the electric charge at described capacitance module 12 two ends of simultaneously can releasing slowly, ensure that the use safety of components and parts.
Figure 3 shows that the embodiment of the circuit structure of the utility model overvoltage bypass checkout gear.
In the superpotential process of detection: if the voltage at described capacitance module 12 and current limliting module 13 two ends is less than the trigger voltage of described overvoltage trigger element 112, then described experiment power supply charges to capacitor 121, described capacitor 121 two ends Accumulating charge, capacitor 121 is connected in parallel to the first resistance 141, slowly to release before thyristor 111 triggering and conducting the electric charge at described capacitor 121 two ends, described second resistance 131 is as energy consuming components, the electric energy of consumption test power supply release, is limited in the electric current in charging process.
When the voltage at described capacitance module 12 and current limliting module 13 two ends is increased to the trigger voltage being greater than described overvoltage trigger element 112, described overvoltage trigger element 112 controls described thyristor 111 triggering and conducting, and described experiment power supply stops the charging to described capacitor 121.Described capacitor 121 discharges simultaneously, and described thyristor 111, capacitor 121 and the second resistance 131 form loop, and described second resistance 131, as energy consuming components, consumes the electric energy of described capacitor 121 release, is limited in the electric current in discharge process.
The utility model overvoltage bypass checkout gear can the voltage status at Detection capacitance module 12 and current limliting module 13 two ends in real time, and judge that can trigger module 11 normally work with this, promptly and accurately, highly sensitive, reliability is strong.The loop that the first resistance 141 is formed with capacitor 121 is adopted in the utility model overvoltage bypass checkout gear, and the electric charge on the loop releasing capacitor 121 of capacitor 121, second resistance 131 and thyristor 111 formation, guarantee the safety operated.And the utility model overvoltage bypass structure of the detecting device is simple, easy to operate, be applicable in the circuit of various detection supply voltage.
Below preferred implementation of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection range of the present utility model.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different execution mode of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (5)
1. an overvoltage bypass checkout gear, be electrically connected trigger module (11), for detecting the working condition of trigger module (11), it is characterized in that, described checkout gear comprises:
Supply unit (10), is connected in parallel, for providing charge power supply with described trigger module (11);
Capacitance module (12), the electric energy for receiving described supply unit (10) carries out charging or electric discharge after described supply unit (10) stops charging; And
Current limliting module (13), is electrically connected described supply unit (10) and capacitance module (12), for limiting described capacitance module (12) electric current in charge or discharge process.
2. overvoltage bypass checkout gear according to claim 1, it is characterized in that, described checkout gear also comprises:
Module of releasing (14), is connected in parallel with described capacitance module (12), for the electric charge at described capacitance module (12) two ends of releasing.
3. overvoltage bypass checkout gear according to claim 2, is characterized in that, described in module (14) of releasing be the first resistance (141).
4. overvoltage bypass checkout gear according to claim 1, is characterized in that, described capacitance module (12) is capacitor (121).
5. overvoltage bypass checkout gear according to claim 1, is characterized in that, described current limliting module (13) is the second resistance (131).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420813883.3U CN204258281U (en) | 2014-12-18 | 2014-12-18 | Overvoltage bypass checkout gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420813883.3U CN204258281U (en) | 2014-12-18 | 2014-12-18 | Overvoltage bypass checkout gear |
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| Publication Number | Publication Date |
|---|---|
| CN204258281U true CN204258281U (en) | 2015-04-08 |
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| CN201420813883.3U Active CN204258281U (en) | 2014-12-18 | 2014-12-18 | Overvoltage bypass checkout gear |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337853A (en) * | 2020-04-23 | 2020-06-26 | 瑞尔安全(北京)技术有限公司 | Tank car grounding detection system and method |
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2014
- 2014-12-18 CN CN201420813883.3U patent/CN204258281U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337853A (en) * | 2020-04-23 | 2020-06-26 | 瑞尔安全(北京)技术有限公司 | Tank car grounding detection system and method |
| CN111337853B (en) * | 2020-04-23 | 2022-08-02 | 瑞尔安全(北京)技术有限公司 | Tank car grounding detection system and method |
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| GR01 | Patent grant |