CN102590720A - High-voltage electrical insulated monitoring device with current limiting protection function - Google Patents
High-voltage electrical insulated monitoring device with current limiting protection function Download PDFInfo
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- CN102590720A CN102590720A CN2012100535568A CN201210053556A CN102590720A CN 102590720 A CN102590720 A CN 102590720A CN 2012100535568 A CN2012100535568 A CN 2012100535568A CN 201210053556 A CN201210053556 A CN 201210053556A CN 102590720 A CN102590720 A CN 102590720A
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Abstract
The invention discloses a high-voltage electrical insulated monitoring device with a current limiting protection function. The high-voltage electrical insulated monitoring device is used for improving the safety of online insulated monitoring of a high-voltage electrical system of an electrical automobile and belongs to the technical field of high-voltage electrical insulated monitoring. The high-voltage electrical insulated monitoring device comprises a current limiting protection circuit and an improved balance bridge type measurement circuit, wherein the current limiting protection circuit comprises a threshold setting circuit, a current threshold detection circuit, a protection switch and a trigger alarming circuit unit; and the improved balance bridge type measurement circuit comprises a constant sampling bridge circuit unit, a variable sampling bridge circuit unit, a measuring and controlling unit and an insulated monitoring reference point circuit. Due to the adoption of the structure, the insulating degree of the high-voltage electrical insulated monitoring device, which is relative to positive and negative polarities of the insulated monitoring reference point circuit, can be accurately detected by adopting an improved balance bridge technology; and self protection can be effectively realized by adopting current limiting protection measures under the conditions that electrical elements in an internal circuit are failed or external interference exists, and thus the safety of the insulated monitoring device is improved.
Description
Technical field
The present invention relates to a kind of insulating monitoring technology of high-voltage electric system, specifically a kind of insulating of electric measurement of high pressure monitoring device with electric current limiting protecting.
Background technology
The insulation degree well is the important leverage of the normal operation of high-voltage electric system.Insulating monitoring technology commonly used is divided into " balance bridge circuit ", " high-frequency signal injection " two kinds of principles.The high-frequency signal implantttion technique has non-electric direct-connected advantage, but has the shortcoming that receives electromagnetic interference (EMI) easily, and for example the electromagnetic noise of motor, frequency converter causes accuracy of detection relatively poor.The insulativity that " balance bridge circuit " detects principle detects accurately; Pick-up unit adapts to complex electromagnetic environment, antijamming capability is strong; Its shortcoming is that insulation monitoring and warning device interior section circuit, electronic devices and components need tolerate high pressure; Under this partial circuit and component failure situation, the possibility that false alarm perhaps damages insulation monitoring and warning device can appear.
Summary of the invention
To above-mentioned deficiency, the invention provides a kind of insulating of electric measurement of high pressure monitoring device with electric current limiting protecting, it not only can realize self-protection effectively, and the security that can improve insulation monitoring and warning device.
For addressing the above problem, the present invention adopts following technical scheme: a kind of insulating of electric measurement of high pressure monitoring device with electric current limiting protecting, it is characterized in that, and comprise electric current limiting protecting circuit and improve balance bridge-type metering circuit; Said electric current limiting protecting circuit comprises thresholding initialization circuit, threshold testing circuit, protection switch and triggering warning circuit unit, and said improvement balance bridge-type metering circuit comprises constant sampling bridge circuit unit, variable sampling bridge circuit unit, measurement and control module and insulating monitoring RP circuit;
Wherein, Said protection switch input side is connected with high-voltage electric system; Outgoing side is connected with the threshold testing circuit; The outgoing side of said threshold testing circuit is connected with triggering warning circuit unit, and said triggering warning circuit unit is connected with the control side of protection switch, and said thresholding initialization circuit is connected with the threshold detecting unit; Contacting after described constant sampling bridge circuit unit and the variable sampling bridge circuit unit parallel connection is connected between threshold detecting unit and the high-voltage electric system, and said measurement is connected with insulating monitoring RP circuit with variable sampling bridge circuit unit, constant sampling bridge circuit unit, triggering warning circuit unit respectively with control module.
Further; Said variable sampling bridge circuit unit comprises positive switch, negative switch, either-or switch and biased sample electric bridge; Said positive switch is connected with the positive polarity side of high-voltage electric system; Said negative switch is connected with the negative polarity side of high-voltage electric system; Said either-or switch is connected with negative switch with positive switch respectively, and said positive switch, negative switch and either-or switch are connected with control module with said measurement respectively, and said biased sample electric bridge is connected with insulating monitoring RP circuit with either-or switch respectively.
Principle of work of the present invention:
High-voltage electric system is through protection switch, threshold detecting unit, constant sampling bridge circuit unit, variable sampling bridge circuit unit and insulating monitoring RP circuit formation work loop.If working current surpasses the setting threshold current of threshold detecting unit, then the formation memory of triggering warning circuit unit to be delivered in its result's output and kept output, this output will be closed protection switch and will be sent to measurement and control module.Said measurement and control module can independently produce control signal control and trigger the warning circuit unit and control the duty of protection switch through it.The output that is arranged on constant sampling bridge circuit unit and variable sampling bridge circuit unit after the electric current limiting protecting circuit be connected to respectively measure with control module in order to calculate the insulation degree of high-voltage electric system.
The invention has the beneficial effects as follows: after adopting said structure; The present invention adopts improved balance bridge technology can accurately detect the insulation degree of high-voltage electric system with respect to the positive-negative polarity of insulating monitoring RP circuit; And operating current limiting protecting measure; Can under the situation of internal circuit electronic component failure or external disturbance, realize self-protection effectively, improve the security of insulation monitoring and warning device.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the theory diagram of variable sampling bridge circuit according to the invention unit.
Embodiment
As shown in Figure 1, a kind of insulating of electric measurement of high pressure monitoring device of the present invention, the security that is used to improve electric automobile high-voltage electric system on-line insulation monitoring with electric current limiting protecting.It comprises electric current limiting protecting circuit and improves balance bridge-type metering circuit; Said electric current limiting protecting circuit comprises thresholding initialization circuit, threshold testing circuit, protection switch and triggering warning circuit unit, and said improvement balance bridge-type metering circuit comprises constant sampling bridge circuit unit, variable sampling bridge circuit unit, measurement and control module and insulating monitoring RP circuit.
Wherein, Said protection switch input side is connected with high-voltage electric system; Outgoing side is connected with the threshold testing circuit; The outgoing side of said threshold testing circuit is connected with triggering warning circuit unit, and said triggering warning circuit unit is connected with the control side of protection switch, and said thresholding initialization circuit is connected with the threshold detecting unit; Contacting after described constant sampling bridge circuit unit and the variable sampling bridge circuit unit parallel connection is connected between threshold detecting unit and the high-voltage electric system, and said measurement is connected with insulating monitoring RP circuit with variable sampling bridge circuit unit, constant sampling bridge circuit unit, triggering warning circuit unit respectively with control module.
The threshold detecting unit detects the working current that improves balance bridge-type metering circuit; When components and parts lost efficacy or caused because of accident that the electric current of metering circuit is excessive to surpass the threshold of setting; The threshold detecting unit will produce the output signal and send to measurement and control circuit and triggering warning circuit unit; Break off by triggering warning circuit unit controls protection switch, play a protective role.Said measurement and control circuit can according to circumstances transmit control signal and control the state that triggers the warning circuit unit, and then the state of assist control protection switch.
Fig. 2 is the theory diagram of variable sampling bridge circuit according to the invention unit.As shown in Figure 2; Said variable sampling bridge circuit unit comprises positive switch, negative switch, either-or switch and biased sample electric bridge; Said positive switch is connected with the positive polarity side of high-voltage electric system; Said negative switch is connected with the negative polarity side of high-voltage electric system; Said either-or switch is connected with negative switch with positive switch respectively, and said positive switch, negative switch and either-or switch are connected with control module with said measurement respectively, and said biased sample electric bridge is connected with insulating monitoring RP circuit with either-or switch respectively.Said measurement and control module are carried out control algolithm, will be connected to the biased sample electric bridge with respect to the high pressure of insulating monitoring RP positive polarity or negative polarity respectively, through the output of the constant sampling bridge circuit of combined measurement, calculate the insulation degree.
Claims (2)
1. the insulating of electric measurement of high pressure monitoring device with electric current limiting protecting is characterized in that, comprises electric current limiting protecting circuit and improves balance bridge-type metering circuit; Said electric current limiting protecting circuit comprises thresholding initialization circuit, threshold testing circuit, protection switch and triggering warning circuit unit, and said improvement balance bridge-type metering circuit comprises constant sampling bridge circuit unit, variable sampling bridge circuit unit, measurement and control module and insulating monitoring RP circuit;
Wherein, Said protection switch input side is connected with high-voltage electric system; Outgoing side is connected with the threshold testing circuit; The outgoing side of said threshold testing circuit is connected with triggering warning circuit unit, and said triggering warning circuit unit is connected with the control side of protection switch, and said thresholding initialization circuit is connected with the threshold detecting unit; Contacting after described constant sampling bridge circuit unit and the variable sampling bridge circuit unit parallel connection is connected between threshold detecting unit and the high-voltage electric system, and said measurement is connected with insulating monitoring RP circuit with variable sampling bridge circuit unit, constant sampling bridge circuit unit, triggering warning circuit unit respectively with control module.
2. a kind of insulation monitoring and warning device according to claim 1 with electric current limiting protecting function; It is characterized in that; Said variable sampling bridge circuit comprises positive switch, negative switch, either-or switch and biased sample electric bridge; Said positive switch is connected with the positive polarity side of high-voltage electric system, and said negative switch is connected with the negative polarity side of high-voltage electric system, and said either-or switch is connected with negative switch with positive switch respectively; Said positive switch, negative switch and either-or switch are connected with control module with said measurement respectively, and said biased sample electric bridge is connected with insulating monitoring RP circuit with either-or switch respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100535568A CN102590720A (en) | 2012-03-02 | 2012-03-02 | High-voltage electrical insulated monitoring device with current limiting protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100535568A CN102590720A (en) | 2012-03-02 | 2012-03-02 | High-voltage electrical insulated monitoring device with current limiting protection function |
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| Publication Number | Publication Date |
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| CN102590720A true CN102590720A (en) | 2012-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100535568A Pending CN102590720A (en) | 2012-03-02 | 2012-03-02 | High-voltage electrical insulated monitoring device with current limiting protection function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505808A (en) * | 2014-12-29 | 2015-04-08 | 山东智洋电气股份有限公司 | Voltage insulation monitoring device with function of voltage deviation compensation and voltage deviation compensation method thereof |
| CN111766494A (en) * | 2020-06-18 | 2020-10-13 | 清华大学 | Semiconductor device testing device with protection function and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039659A (en) * | 1988-05-16 | 1990-02-14 | 株式会社日立制作所 | Be used for the abnormality diagnostic system and method for high voltage electric power equip ment |
| CN1307387A (en) * | 2000-02-01 | 2001-08-08 | 阿尔斯通公司 | Improvement of electric protection and control system |
| US20050280385A1 (en) * | 2004-06-21 | 2005-12-22 | Haller William R | Automatic output power limiting electrical device |
| CN101038262A (en) * | 2007-04-03 | 2007-09-19 | 西安交通大学 | Device and method for online monitoring power supply system external Insulation filthy status |
| CN201038725Y (en) * | 2007-01-08 | 2008-03-19 | 韩战平 | Medical appliance overcurrent protection circuit |
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2012
- 2012-03-02 CN CN2012100535568A patent/CN102590720A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039659A (en) * | 1988-05-16 | 1990-02-14 | 株式会社日立制作所 | Be used for the abnormality diagnostic system and method for high voltage electric power equip ment |
| CN1307387A (en) * | 2000-02-01 | 2001-08-08 | 阿尔斯通公司 | Improvement of electric protection and control system |
| US20050280385A1 (en) * | 2004-06-21 | 2005-12-22 | Haller William R | Automatic output power limiting electrical device |
| CN201038725Y (en) * | 2007-01-08 | 2008-03-19 | 韩战平 | Medical appliance overcurrent protection circuit |
| CN101038262A (en) * | 2007-04-03 | 2007-09-19 | 西安交通大学 | Device and method for online monitoring power supply system external Insulation filthy status |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505808A (en) * | 2014-12-29 | 2015-04-08 | 山东智洋电气股份有限公司 | Voltage insulation monitoring device with function of voltage deviation compensation and voltage deviation compensation method thereof |
| CN104505808B (en) * | 2014-12-29 | 2018-01-05 | 山东智洋电气股份有限公司 | The insulation monitoring and warning device of deviation compensation with voltage and its voltage deviation compensation method |
| CN111766494A (en) * | 2020-06-18 | 2020-10-13 | 清华大学 | Semiconductor device testing device with protection function and method |
| CN111766494B (en) * | 2020-06-18 | 2022-06-28 | 清华大学 | Semiconductor device testing device with protection function and method |
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Application publication date: 20120718 |