CN107450001A - A kind of high-voltage isulation detecting system of zero disturbance - Google Patents
A kind of high-voltage isulation detecting system of zero disturbance Download PDFInfo
- Publication number
- CN107450001A CN107450001A CN201710577216.8A CN201710577216A CN107450001A CN 107450001 A CN107450001 A CN 107450001A CN 201710577216 A CN201710577216 A CN 201710577216A CN 107450001 A CN107450001 A CN 107450001A
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- resistance
- bridge circuit
- circuit
- processing unit
- core processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The invention provides the high-voltage isulation detecting system of a kind of zero disturbance, including the first disconnecting switch being serially connected between high voltage bus and ground and the first Insulation monitoring unit, the first Insulation monitoring unit includes the first balanced bridge circuit and the first uneven bridge circuit in parallel；Two inputs of the first signal conditioning circuit are connected with the first balanced bridge circuit both ends, and the output end of first signal conditioning circuit and an input of core processing unit are electrically connected with；First disconnecting switch is also electrically connected with the feeder ear of the core processing unit.The present invention is combined by using balanced bridge circuit and uneven bridge circuit, signal is avoided to inject the interference to high-pressure system, and use gate-controlled switch part isolation high-pressure system and Insulation Inspection System, avoid the power problemses of balanced bridge circuit, and by algorithm, monitor the insulation situation of high-pressure system on-line.
Description
Technical field
The present invention relates to high direct voltage or ac high-voltage system insulation detection technique field, more particularly to a kind of zero disturbance
High-voltage isulation detecting system.
Background technology
At present in High-Voltage Insulation monitors and detects application, partly using Low frequency signal injection method, i.e., to HVDC
AC or DC signal is injected in the positive and negative both ends of system simultaneously, and system detects the reflected signal being superimposed in high-pressure system simultaneously, leads to
Cross the detection to reflected signal and calculating can obtain the equivalent grounding resistance of system (or to system shell) over the ground, to judge
The insulation situation of system.Such a method is in part sensory system such as power industry etc. and does not apply to, power system possess it is a variety of in
After protection signal, due to the reliability requirement of protection signal sensitivity so that signal injection method is infeasible.
Part uses balanced bridge circuit, the detection that balanced bridge circuit carries out insulaion resistance is carried additionally in high-pressure system, when just
When the insulation of negative busbar declines, that is, break the balance of voltage of balanced bridge circuit；Such a circuit structure is simple, cost is low, is not present
The interference of signal injection；But balanced bridge circuit is hung on high voltage bus for a long time, there is that power consumption is big, detection process is relatively passive, reliable
Property difference and additional belt come high-pressure system and Insulation monitoring whole system Insulation Problems.
The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of small power consumption, highly reliable, zero disturbance high-voltage isulation
Detecting system.
To reach above-mentioned purpose, the invention provides the high-voltage isulation detecting system of a kind of zero disturbance, including height is serially connected in
The first disconnecting switch and the first Insulation monitoring unit between bus and ground are pressed, the first Insulation monitoring unit includes in parallel
First balanced bridge circuit and the first uneven bridge circuit；Two inputs of the first signal conditioning circuit and first balance bridge electricity
Road both ends are connected, and the output end of first signal conditioning circuit and an input of core processing unit are electrically connected with；It is described
First disconnecting switch is also electrically connected with the feeder ear of the core processing unit.
By upper, by using being combined for the first balanced bridge circuit and the first uneven bridge circuit, signal injection pair is avoided
The interference of high-pressure system, while the precision for avoiding single balanced bridge circuit from bringing is not high, surveys the problem of wrong report by mistake, has zero to disturb
Dynamic, small power consumption and it is highly reliable the characteristics of.
Optionally, in addition to the second disconnecting switch being serially connected between high voltage bus and ground and the second balanced bridge circuit,
Two inputs of binary signal modulate circuit are connected with the second balanced bridge circuit both ends, the secondary signal modulate circuit it is defeated
Go out end and another input of core processing unit is electrically connected with；Second disconnecting switch also with the core processing unit
Another feeder ear is electrically connected with.
By upper, the detection that the second balanced bridge circuit carries out insulaion resistance, such a circuit structure letter are carried additionally in high-pressure system
Single, cost is low.
Optionally, first disconnecting switch and the second disconnecting switch are variable connector, first balanced bridge circuit,
One uneven bridge circuit, the feeder ear of core processing unit are connected on each way switch of the first disconnecting switch；Described
Two balanced bridge circuits, another feeder ear of core processing unit are connected on each way switch of the second disconnecting switch.
By upper, to carrying out physics and electrical isolation between high-pressure system and Insulation Inspection System, Insulation Inspection System is avoided
The insulating properties of total system are influenceed and reduced to caused by high-pressure system.
Optionally, the output end of the core processing unit and the input of state reporting signal alarm are electrically connected with.
By upper, by core processing unit, with reference to the actual condition of current system, judge whether to reach alarming threshold, such as
Reach alarming threshold, then need reporting fault information.
Optionally, first balanced bridge circuit includes the resistance R being sequentially connected in series5And R7, the first uneven bridge circuit
Include the resistance R of series connection successively6And R8。
By upper, using a resistance, design requirement, thus two by being arranged in series resistance or multiple electricity are not reached
Hinder to reach design requirement, in of the invention, design requirement is can reach using two resistance of series connection.
Optionally, second balanced bridge circuit includes the resistance R of series connection17And R18。
By upper, using a resistance, design requirement, thus two by being arranged in series resistance or multiple electricity are not reached
Hinder to reach design requirement, in of the invention, design requirement is can reach using two resistance of series connection.
Optionally, first disconnecting switch includes isolation gate-controlled switch K1 and K2, the isolation gate-controlled switch K1 connections
In high voltage bus and resistance R5Between, the isolation gate-controlled switch K2 is connected to high voltage bus and resistance R6Between；Described second every
Leave pass include isolation gate-controlled switch K3, the isolation gate-controlled switch K3 be connected to high voltage bus and resistance R18Between.
By upper, by isolating gate-controlled switch K1, K2 and K3, predetermined switching is realized to Insulation Inspection System.
Optionally, first signal conditioning circuit and secondary signal modulate circuit include：Two operational amplifier U1A,
The sample circuit that U1B is formed；The normal phase input end of the operational amplifier U1A passes through the resistance R that is sequentially connected in series1、R2、R3And R4
It is connected to resistance R5With isolating on the circuit between gate-controlled switch K1, the negative-phase input of the operational amplifier U1A by according to
The resistance R of secondary series connection9、R10、R11And R12After be grounded；The normal phase input end of the operational amplifier U1B passes through the electricity that is sequentially connected in series
Hinder R19、R20、R21And R22It is connected to resistance R18With isolating on the circuit between gate-controlled switch K3, the operational amplifier U1B's
Negative-phase input passes through the resistance R that is sequentially connected in series13、R14、R15And R16After be grounded.
By upper, by balance bridge and uneven bridge circuit binding signal modulate circuit, the voltage to high-pressure system to the earth
Value, accurate sampling is made, and collection signal is sent into core processing unit, judged.
Brief description of the drawings
Fig. 1 is the structured flowchart of the high-voltage isulation detecting system of zero disturbance；
Fig. 2 is the circuit diagram of the detection algorithm of the high-voltage isulation detecting system of zero disturbance；
Fig. 3 is the sample circuit of the magnitude of voltage between the high-pressure system of the high-voltage isulation detecting system of zero disturbance and the earth
Figure.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
A kind of high-voltage isulation detecting system of zero disturbance, as shown in figure 1, including be serially connected between high voltage bus and ground the
One disconnecting switch 10 and the first Insulation monitoring unit, the first Insulation monitoring unit include the first balanced bridge circuit 11 in parallel
With the first uneven bridge circuit 12；Two inputs of the first signal conditioning circuit 13 connect with the both ends of the first balanced bridge circuit 11
Connect, the output end of first signal conditioning circuit 13 is electrically connected with an input of core processing unit 14；Described first
Disconnecting switch 10 is also electrically connected with the feeder ear of the core processing unit 14.
Further, in addition to the second disconnecting switch 15 being serially connected between high voltage bus and ground and the second balanced bridge circuit
16, two inputs of secondary signal modulate circuit 17 are connected with the both ends of the second balanced bridge circuit 16, and the secondary signal is adjusted
The output end of circuit 17 is managed to be electrically connected with another input of core processing unit 14；Second disconnecting switch 15 also with institute
Another feeder ear for stating core processing unit 14 is electrically connected with.
The disconnecting switch 15 of first disconnecting switch 10 and second is variable connector, first balanced bridge circuit 11,
One uneven bridge circuit 12, the feeder ear of core processing unit 14 are connected on each way switch of the first disconnecting switch 10；
Second balanced bridge circuit 16, another feeder ear of core processing unit 14 are connected to each road of the second disconnecting switch 15
On switch.
The output end of the core processing unit 14 and the input of state reporting signal alarm 18 are electrically connected with.
Specifically, the whole system compositional block diagram of the high-voltage isulation detecting system of zero disturbance is as shown in Figure 1.To each portion
It is respectively described below：
1：First, second disconnecting switch：Gate-controlled switch is used, to carrying out thing between high-pressure system and Insulation Inspection System
Reason and electrical isolation, avoid Insulation Inspection System that the insulating properties of total system are impacted and reduced to high-pressure system, isolate
Switch is realized using stress levels 1000VDC tongue tube；
2：First, second balanced bridge circuit and the first uneven bridge circuit：It is uneven by first, second balance bridge and first
Heng Qiao's is combined, that is, has circuit structure simple possible, while the precision for avoiding single balanced bridge circuit from bringing is not high, surveys by mistake
The problem of wrong report；
3：First, second signal conditioning circuit：Part is realized in this part for the function of Insulation Inspection System, and system passes through
The sample circuit that two operational amplifiers of U1A and U1B are formed, realizes the collection to magnitude of voltage between high-pressure system and the earth, ties
Peculiar algorithm in Fig. 2 is closed, accurately monitors the insulation data of high-pressure system over the ground in real time；
4：Core processing unit and the alarm of state reporting signal：By calculating of the core processing unit to algorithm, with reference to working as
The actual condition of preceding system, and judge whether to reach alarming threshold.
As shown in figure 3, first balanced bridge circuit 11 includes the resistance R being sequentially connected in series5And R7, described first is uneven
Bridge circuit 12 includes the resistance R of series connection successively6And R8.Second balanced bridge circuit 16 includes the resistance R of series connection17And R18。
First disconnecting switch 10 includes isolation gate-controlled switch K1 and K2, and the isolation gate-controlled switch K1 is connected to high pressure
Bus and resistance R5Between, the isolation gate-controlled switch K2 is connected to high voltage bus and resistance R6Between；Second disconnecting switch
15, which include isolation gate-controlled switch K3, the isolation gate-controlled switch K3, is connected to high voltage bus and resistance R18Between.
First signal conditioning circuit 13 and secondary signal modulate circuit 17 include：Two operational amplifiers U1A, U1B
The sample circuit of composition；The normal phase input end (i.e. operational amplifier U1A pin 3) of the operational amplifier U1A is by successively
The resistance R of series connection1、R2、R3And R4It is connected to resistance R5With isolating on the circuit between gate-controlled switch K1, the operational amplifier
U1A negative-phase input (i.e. operational amplifier U1A pin 2) passes through the resistance R that is sequentially connected in series9、R10、R11And R12After be grounded；
The normal phase input end (i.e. operational amplifier U1B pin 5) of the operational amplifier U1B passes through the resistance R that is sequentially connected in series19、
R20、R21And R22It is connected to resistance R18With isolating on the circuit between gate-controlled switch K3, the negative of the operational amplifier U1B is defeated
Enter end (i.e. operational amplifier U1B pin 6) and pass through the resistance R that is sequentially connected in series13、R14、R15And R16After be grounded.
Specifically, operational amplifier U1A pin 1 connects core processing unit, and pin 4 is grounded, and pin 8 is powered；Computing
Amplifier U1B pin 7 connects core processing unit.
As shown in Fig. 2 specific algorithm judges that schematic diagram is as follows：
R+ and R- in dotted line frame, for the positive and negative insulating resistance value over the ground of high pressure of simulation.Wherein Ra, Rb and Ra1 are mould
Intend the first balance resistor bridge, the second balance resistor bridge and the first uneven resistor bridge of input, according to Fig. 2, there is approximation
Formula is as follows：
Meanwhile because having put into Ra, Rb and Ra1, voltage detecting circuit forms loop.Pass through first, second signal condition
Circuit, the magnitude of voltage to the earth positive and negative to bus sample, and solve binary quadratic equation, you can R+ and R- resistance are drawn,
That is the positive and negative current insulating resistance value over the ground of system.
Specifically, can to Insulation Inspection System as shown in figure 3, by the control to isolating gate-controlled switch K1 or K2 or K3
Realize predetermined switching.First, second balanced bridge circuit and the first uneven bridge circuit combine first, second signal conditioning circuit,
Magnitude of voltage to high-pressure system to the earth, accurate sampling is made, and collection signal is sent into core processing unit, judged.
, will be exhausted by the control folding to isolating gate-controlled switch K1/K2/K3 at system electrification initial stage, or in system operation
Edge detecting system puts into or cut out high-pressure system.
After input, high-pressure system balances resistor bridge R17/R18 and first not by the first balance resistor bridge R5/R7 and second
Resistor bridge R6/R8 is balanced, based on " Kirchhoff's current law (KCL) KCL ", based on formula (1) and (2), there is following equation：
After the resistor voltage divider circuit that DC+ and DC- is formed through R1-R4, R9-R12 and R13-R16, R19-R22 simultaneously, by U1A
The collection of magnitude of voltage is carried out with U1B, then can draw the magnitude of voltage of current DC+ and DC- to the earth, with reference to aforesaid equation (3) and
(4), core processing unit can solve the insulating resistance value of current DC+ and DC- over the ground, i.e. " R+ " and " R- ".
Core processing unit combines alarming threshold set in advance, and current system conditions are judged.If reach alarm
Threshold value, then need reporting fault information.
Described above is the preferred embodiment of the present invention, can not limit the right model of the present invention with this certainly
Enclose, it is noted that for those skilled in the art, under the premise without departing from the principles of the invention, may be used also
To make some improvement and variation, these are improved and variation is also considered as protection scope of the present invention.
Claims (8)
- A kind of 1. high-voltage isulation detecting system of zero disturbance, it is characterised in that：IncludingThe first disconnecting switch being serially connected between high voltage bus and ground and the first Insulation monitoring unit,The first Insulation monitoring unit includes the first balanced bridge circuit and the first uneven bridge circuit in parallel；Two inputs of the first signal conditioning circuit are connected with the first balanced bridge circuit both ends, the first signal condition electricity The output end on road and an input of core processing unit are electrically connected with；First disconnecting switch is also electrically connected with the feeder ear of the core processing unit.
- 2. the high-voltage isulation detecting system of zero disturbance according to claim 1, it is characterised in that：Also includeThe second disconnecting switch being serially connected between high voltage bus and ground and the second balanced bridge circuit,Two inputs of secondary signal modulate circuit are connected with the second balanced bridge circuit both ends, the secondary signal conditioning electricity The output end on road and another input of core processing unit are electrically connected with；Second disconnecting switch is also electrically connected with another feeder ear of the core processing unit.
- 3. the high-voltage isulation detecting system of zero disturbance according to claim 2, it is characterised in that：First disconnecting switch It is variable connector with the second disconnecting switch,First balanced bridge circuit, the first uneven bridge circuit, the feeder ear of core processing unit be connected to first every Leave on each way switch of pass；Open on each road that second balanced bridge circuit, another feeder ear of core processing unit are connected to the second disconnecting switch Shut.
- 4. the high-voltage isulation detecting system of zero disturbance according to claim 3, it is characterised in that：The core processing unit The input of output end and state reporting signal alarm be electrically connected with.
- 5. the high-voltage isulation detecting system of zero disturbance according to claim 4, it is characterised in that：The first balance bridge electricity Road includes the resistance R being sequentially connected in series5And R7, the first uneven bridge circuit successively include series connection resistance R6And R8。
- 6. the high-voltage isulation detecting system of zero disturbance according to claim 5, it is characterised in that：The second balance bridge electricity Road includes the resistance R of series connection17And R18。
- 7. the high-voltage isulation detecting system of zero disturbance according to claim 6, it is characterised in that：First disconnecting switch Including isolation gate-controlled switch K1 and K2, the isolation gate-controlled switch K1 is connected to high voltage bus and resistance R5Between, the isolation Gate-controlled switch K2 is connected to high voltage bus and resistance R6Between；Second disconnecting switch includes isolation gate-controlled switch K3, the isolation gate-controlled switch K3 and is connected to high voltage bus and resistance R18Between.
- 8. the high-voltage isulation detecting system of zero disturbance according to claim 7, it is characterised in that first signal condition Circuit and secondary signal modulate circuit include：The sample circuit that two operational amplifiers U1A, U1B are formed；The normal phase input end of the operational amplifier U1A passes through the resistance R that is sequentially connected in series1、R2、R3And R4It is connected to resistance R5With every From on the circuit between gate-controlled switch K1, the negative-phase input of the operational amplifier U1A passes through the resistance R that is sequentially connected in series9、 R10、R11And R12After be grounded；The normal phase input end of the operational amplifier U1B passes through the resistance R that is sequentially connected in series19、R20、R21And R22It is connected to resistance R18 With isolating on the circuit between gate-controlled switch K3, the negative-phase input of the operational amplifier U1B passes through the resistance that is sequentially connected in series R13、R14、R15And R16After be grounded.
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| CN201710577216.8A CN107450001A (en) | 2017-07-14 | 2017-07-14 | A kind of high-voltage isulation detecting system of zero disturbance |
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| CN201710577216.8A CN107450001A (en) | 2017-07-14 | 2017-07-14 | A kind of high-voltage isulation detecting system of zero disturbance |
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| CN107450001A true CN107450001A (en) | 2017-12-08 |
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| CN201710577216.8A Pending CN107450001A (en) | 2017-07-14 | 2017-07-14 | A kind of high-voltage isulation detecting system of zero disturbance |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101074978A (en) * | 2007-05-22 | 2007-11-21 | 南京力导科技股份有限公司 | Method for measuring power-supply grounded resistance triple-bridged arm of electric system |
| CN101738560A (en) * | 2008-11-14 | 2010-06-16 | 南车株洲电力机车有限公司 | Unbalanced electric bridge-based grounding detection circuit for locomotive control loop |
| CN202870174U (en) * | 2012-10-30 | 2013-04-10 | 广东易事特电源股份有限公司 | Low energy consumption circuit for detecting insulating resistance of DC bus |
| CN106483422A (en) * | 2016-11-30 | 2017-03-08 | 国网江苏省电力公司连云港供电公司 | A kind of DC grounding monitor instrument |
| CN206178039U (en) * | 2016-10-21 | 2017-05-17 | 西安特锐德智能充电科技有限公司 | Direct current fills insulating observation circuit of electric pile |
-
2017
- 2017-07-14 CN CN201710577216.8A patent/CN107450001A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101074978A (en) * | 2007-05-22 | 2007-11-21 | 南京力导科技股份有限公司 | Method for measuring power-supply grounded resistance triple-bridged arm of electric system |
| CN101738560A (en) * | 2008-11-14 | 2010-06-16 | 南车株洲电力机车有限公司 | Unbalanced electric bridge-based grounding detection circuit for locomotive control loop |
| CN202870174U (en) * | 2012-10-30 | 2013-04-10 | 广东易事特电源股份有限公司 | Low energy consumption circuit for detecting insulating resistance of DC bus |
| CN206178039U (en) * | 2016-10-21 | 2017-05-17 | 西安特锐德智能充电科技有限公司 | Direct current fills insulating observation circuit of electric pile |
| CN106483422A (en) * | 2016-11-30 | 2017-03-08 | 国网江苏省电力公司连云港供电公司 | A kind of DC grounding monitor instrument |
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