CN204374366U - The insulation monitoring and warning device of difference compensation function with voltage - Google Patents
The insulation monitoring and warning device of difference compensation function with voltage Download PDFInfo
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- CN204374366U CN204374366U CN201420852769.1U CN201420852769U CN204374366U CN 204374366 U CN204374366 U CN 204374366U CN 201420852769 U CN201420852769 U CN 201420852769U CN 204374366 U CN204374366 U CN 204374366U
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Abstract
The utility model relates to a kind of insulation monitoring and warning device differential pressure adjusting device, be specifically related to a kind of insulation monitoring and warning device of difference compensation function with voltage, comprise balanced bridge circuit, compensating circuit and control module, compensating circuit comprises the positive pole be connected between DC bus positive pole and ground wire and compensates triode and the negative pole be connected between DC bus negative pole and ground wire compensates triode, positive pole compensates transistor collector and is connected to DC bus positive pole, emitter is connected to ground wire by current-limiting resistance R3, negative pole compensates transistor collector and is connected to ground wire, emitter is connected to DC bus negative pole by current-limiting resistance R4, just, the base stage that negative pole compensates triode is connected to change-over switch respectively by current-limiting resistance R5 and current-limiting resistance R6, change-over switch is connected to control module.The utility model realizes, to the deviation ground fine compensation of straight-flow system voltage-to-ground, ensureing the safe operation of straight-flow system, eliminating safe hidden trouble.
Description
Technical field
The utility model relates to a kind of insulation monitoring and warning device differential pressure adjusting device, is specifically related to a kind of insulation monitoring and warning device of difference compensation function with voltage.
Background technology
The safe and reliable operation of direct supply is most important for the safe and reliable operation of transformer station.But because DC power supply equipment is many, power cable is long, often occurs the faults such as DC earthing in actual motion.Although straight-flow system is run floatingly, the normal operation of single-point grounding not influential system, must be eliminated by looking up the fault as early as possible, otherwise when there is second point ground connection, will cause relay or protective device misoperation, lead to grave consequences.At present, generally employ straight-flow system insulation and line selection apparatus in transformer station, serve good effect.
D.C. isolation monitoring device can only monitor straight-flow system insulation to be reduced, when but straight-flow system generation one pole or the two poles of the earth insulation reduce, if cause straight-flow system voltage-to-ground deviation excessive, even if insulation against ground resistance is not reduced to the degree of insulation alarm, also hidden danger can be left to the safe operation of straight-flow system.This time, reasonable method was the deviation taking corresponding indemnifying measure to reduce straight-flow system voltage-to-ground, made it return to safe range, thus ensured the safe operation of straight-flow system.
Utility model content
For the deficiency in solving the problems of the technologies described above, the purpose of this utility model is: the insulation monitoring and warning device providing a kind of difference compensation function with voltage, the deviation of fine compensation straight-flow system voltage-to-ground, ensures the safe operation of straight-flow system, eliminates safe hidden trouble.
The technical scheme that the utility model adopts for its technical matters of solution is:
The insulation monitoring and warning device of described difference compensation function with voltage, comprise insulated monitor and balanced bridge circuit, also comprise compensating circuit and control module, compensating circuit comprises positive pole and compensates triode and negative pole compensation triode, positive pole compensates transistor collector and is connected to DC bus positive pole, emitter is connected to ground wire by current-limiting resistance R3, negative pole compensates transistor collector and is connected to ground wire, emitter is connected to DC bus negative pole by current-limiting resistance R4, just, the base stage that negative pole compensates triode is connected to change-over switch respectively by current-limiting resistance R5 and current-limiting resistance R6, change-over switch and insulated monitor are connected to control module.
Balanced bridge circuit described in the utility model is made up of the balance resistance R1 be connected between DC bus positive pole and ground wire, the balance resistance R2 be connected between DC bus negative pole and ground wire, under normal circumstances, positive and negative electrode compensates the base voltage equal 0 of triode, both are operated in cut-off region, between collector and emitter, no current flows through, and the DC bus positive pole resistance to earth that insulated monitor monitors and DC bus negative pole resistance to earth resistance are sent to control module.
Suppose that DC bus positive pole resistance to earth is R+, when R+ reduces, DC bus positive and negative electrode voltage-to-ground deviation will be caused excessive.According to Kirchhoff's law, the electric current sum flowing through balance resistance R1 and DC bus positive pole resistance to earth R+ equals to flow through the electric current of balance resistance R2, can write I
1+ I
+=I
2.Now, change-over switch connects negative pole and compensates triode and control module, is regulated the output voltage V2 of digital to analog converter by control module, and make negative pole compensate triode operation in amplification region, now negative pole compensates between transistor collector and emitter and has electric current I
cflow through, work as I
csize and I
+time consistent, so DC bus positive and negative electrode voltage-to-ground can reach balance, realizes the fine compensation of voltage-to-ground deviation.
Wherein, preferred version is:
Described change-over switch is connected to control module by digital to analog converter, and the digital signal that control module exports is converted to simulating signal by digital to analog converter, compensates triode use for positive and negative electrode.
Change-over switch adopts relay, and relay normally open contact and normally closed contact are connected with current-limiting resistance R5 with current-limiting resistance R6 respectively, and relay coil is connected with control module, and control module, according to current circuit conditions, switches the compensation triode be connected with control module.
Described control module is single-chip microcomputer, such as 51 series, single-chip microcomputer all has application in various control system, and cost is lower, the program that this programme control module regulates the realization of transistor base voltage function to rely on belongs to prior art, does not need to pay creative work.
Compared with prior art, the utility model has following beneficial effect:
The utility model utilizes triode operation characteristic, realize the level and smooth control of the size of current between collector and emitter, and combine the deviation ground fine compensation utilizing Kirchhoff's law realization to straight-flow system voltage-to-ground, ensure the safe operation of straight-flow system, eliminate safe hidden trouble.
Accompanying drawing explanation
Fig. 1 the utility model circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further:
As shown in Figure 1, the insulation monitoring and warning device of difference compensation function with voltage described in the utility model, comprise insulated monitor and balanced bridge circuit, also comprise compensating circuit and control module, compensating circuit comprises positive pole and compensates triode T1 and negative pole compensation triode T2, positive pole compensates triode T1 collector and is connected to DC bus positive pole KMI+, emitter is connected to ground wire by current-limiting resistance R3, negative pole compensates triode T2 collector and is connected to ground wire, emitter is connected to DC bus negative pole KMI-by current-limiting resistance R4, just, the base stage that negative pole compensates triode is connected to change-over switch K respectively by current-limiting resistance R5 and current-limiting resistance R6, change-over switch K and insulated monitor are connected to control module M, insulated monitor is omitted in Fig. 1.
Wherein, change-over switch K is connected to control module M by digital to analog converter DAC, and the digital signal that control module exports is converted to simulating signal by digital to analog converter DAC, compensates triode use for positive and negative electrode; Change-over switch K adopts relay, relay normally open contact and normally closed contact are connected with current-limiting resistance R5 with current-limiting resistance R6 respectively, relay coil is connected with control module M, and control module M, according to current circuit conditions, switches the compensation triode be connected with control module M; Control module is single-chip microcomputer, such as 51 series, and single-chip microcomputer all has application in various control system, and cost is lower, and the program that this programme control module regulates the realization of transistor base voltage function to rely on belongs to prior art, does not need to pay creative work.
Balanced bridge circuit described in the utility model is made up of the balance resistance R1 be connected between DC bus positive pole KMI+ and ground wire, the balance resistance R2 be connected between DC bus negative pole KMI-and ground wire, under normal circumstances, positive and negative electrode compensates the base voltage equal 0 of triode, both are operated in cut-off region, between collector and emitter, no current flows through, and the DC bus positive pole resistance to earth that insulated monitor monitors and DC bus negative pole resistance to earth resistance are sent to control module M.
As Fig. 1, suppose that DC bus positive pole KMI+ resistance to earth is R+, when R+ reduces, DC bus positive and negative electrode voltage-to-ground deviation will be caused excessive.According to Kirchhoff's law, the electric current sum flowing through balance resistance R1 and DC bus positive pole KMI+ resistance to earth R+ equals to flow through the electric current of balance resistance R2, can write I
1+ I
+=I
2.Now, change-over switch K connects negative pole and compensates triode T2 and control module, regulated the output voltage V2 of digital to analog converter by control module, make negative pole compensate triode T2 and be operated in amplification region, now negative pole compensates between triode T2 collector and emitter and has electric current I
cflow through, work as I
csize and I
+time consistent, so DC bus positive and negative electrode voltage-to-ground can reach balance, realizes the fine compensation of voltage-to-ground deviation.
The Principles of Regulation that negative pole compensates the base voltage V2 of triode T2 are:
According to triode self character, base current I
b=(V2 – U
bEQ)/(R6+ (1+ β) R4), electric current I between collector and emitter
c=(1+ β) * I
b, wherein, U
bEQfor transistor base and collector pressure drop, for specific triode, this value is certain value, and V2 is the output voltage of digital to analog converter, and β is triode enlargement factor, is also definite value, and R6, R4 are known numeric value, at acquisition I
+when numerical value, by calculating the target value of V2.
In like manner, suppose that in balanced bridge circuit, DC bus negative pole resistance to earth is R-, when R-reduces, change-over switch connects positive pole and compensates triode and control module, the output voltage V1 of digital to analog converter is regulated by control module, make positive pole compensate triode T1 and be operated in amplification region, now have electric current between positive pole compensation transistor collector and emitter and flow through, as this electric current and I
1sum and I
2time consistent, DC bus positive and negative electrode voltage-to-ground can reach balance, realizes the fine compensation of voltage-to-ground deviation.
Claims (4)
1. the insulation monitoring and warning device of a difference compensation function with voltage, comprise insulated monitor and balanced bridge circuit, it is characterized in that, also comprise compensating circuit and control module, compensating circuit comprises positive pole and compensates triode and negative pole compensation triode, positive pole compensates transistor collector and is connected to DC bus positive pole, emitter is connected to ground wire by current-limiting resistance R3, negative pole compensates transistor collector and is connected to ground wire, emitter is connected to DC bus negative pole by current-limiting resistance R4, just, the base stage that negative pole compensates triode is connected to change-over switch respectively by current-limiting resistance R5 and current-limiting resistance R6, change-over switch and insulated monitor are connected to control module.
2. the insulation monitoring and warning device of difference compensation function with voltage according to claim 1, is characterized in that, described change-over switch is connected to control module by digital to analog converter.
3. the insulation monitoring and warning device of difference compensation function with voltage according to claim 1 and 2, it is characterized in that, described change-over switch adopts relay, and relay normally open contact and normally closed contact are connected with current-limiting resistance R5 with current-limiting resistance R6 respectively, and relay coil is connected with control module.
4. the insulation monitoring and warning device of difference compensation function with voltage according to claim 3, is characterized in that, described control module is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420852769.1U CN204374366U (en) | 2014-12-29 | 2014-12-29 | The insulation monitoring and warning device of difference compensation function with voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420852769.1U CN204374366U (en) | 2014-12-29 | 2014-12-29 | The insulation monitoring and warning device of difference compensation function with voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204374366U true CN204374366U (en) | 2015-06-03 |
Family
ID=53330574
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420852769.1U Active CN204374366U (en) | 2014-12-29 | 2014-12-29 | The insulation monitoring and warning device of difference compensation function with voltage |
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| Country | Link |
|---|---|
| CN (1) | CN204374366U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031058A (en) * | 2018-06-15 | 2018-12-18 | 华为技术有限公司 | Insulation detection device and insulation detecting circuit |
-
2014
- 2014-12-29 CN CN201420852769.1U patent/CN204374366U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031058A (en) * | 2018-06-15 | 2018-12-18 | 华为技术有限公司 | Insulation detection device and insulation detecting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 405 room 255086, block E, No. 135, Zibo Development Zone, Shandong, China Patentee after: Zhiyang Innovation Technology Co., Ltd. Address before: 405 room 255086, block E, No. 135, Zibo Development Zone, Shandong, China Patentee before: SHANDONG ZHIYANG ELECTRIC CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |