CN104330681B - Dc bus scurries into the detection means of exchange in a kind of DC power system - Google Patents
Dc bus scurries into the detection means of exchange in a kind of DC power system Download PDFInfo
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- CN104330681B CN104330681B CN201310309180.7A CN201310309180A CN104330681B CN 104330681 B CN104330681 B CN 104330681B CN 201310309180 A CN201310309180 A CN 201310309180A CN 104330681 B CN104330681 B CN 104330681B
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Abstract
The present invention relates to the detection means that dc bus in a kind of DC power system scurries into exchange, including：Amplification module and ADC modular converters are extracted in partial pressure sampling module, exchange.The partial pressure sampling module first end connection closing bus bar just or control bus just, the second end connection closing bus bar of the partial pressure sampling module is negative and/or control bus is negative, 3rd termination the earth of the partial pressure sampling module, the sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure sampling module includes the first balance resistor bridge and the second balance resistor bridge.Implement the detection means of the present invention, the exchange of HM+, HM, KM+, KM to the earth can be covered comprehensively to scurry into, and its partial pressure sampling module only includes the three balance resistor bridges used in insulation detection device, can be sampled all AC signals in single bridge arm, while reducing the requirement to device parameters.
Description
Technical field
The present invention relates to straight-flow system monitoring field, more specifically to dc bus in a kind of DC power system
Scurry into the detection means of exchange.
Background technology
In power system, dc source is as main control protective loop power supply, because cable branch and wiring go out
It is mouthful more, often occur because mis-wired, touch by mistake, the failure of DC loop is scurried into exchange caused by device performance declines etc..
When DC loop is scurried into exchange, easily cause the misoperation of protective relay, existing more power plant, transformer station quoted in recent years
This phenomenon of the failure.
In power plant and transformer station, connect greatly directly or by arc suppression coil because alternating current is general, therefore dc source system
The approach of DC loop is scurried into exchange in system, mainly there is two kinds.One kind is scurried between direct current positive bus and ground, another to be
Scurried between direct current negative busbar and ground.And in most systems, dc bus is divided into closing bus bar HM and control bus again
KM, both are contacted by silicon chain.As shown in figure 1, the positive HM+ of closing bus bar and the positive KM+ of control bus are through positive bus-bar grounding resistance R1
Ground connection, and closing bus bar bears HM- and control bus is born KM- and is grounded through negative busbar grounding resistance R2.Therefore the mode scurried into is exchanged
Just it is divided into and is scurried between HM+ and the earth, from scurrying into, scurried between HM-/KM- and the earth, respectively such as between KM+ and the earth
Shown in Fig. 2, Fig. 3, Fig. 4.
Chinese patent CN201120537379.1 discloses the device that a kind of monitoring alternating current seals in straight-flow system, the dress
Put including alternating current quantity sampling circuit, sampled signal modulate circuit, AD converter and processor, possess basic exchange and scurry into
Detection and alarm function.Its alternating current quantity sampling circuit includes resistance R1-R4, electric capacity C1, and wherein resistance R1 and R2 is connected on KM+
Between KM-, resistance R3, R4 and electric capacity C1 be connected between KM- and ground.Therefore, the monitoring alternating current seals in straight-flow system
Device not only complex circuit designs, and be only capable of to KM+ and KM- over the ground between scurry into exchange and detect that detection range can not be complete
Face, which is covered to scurry between DC loop HM+, KM+, HM-/KM- for often occurring in power system and the earth, to be exchanged.
The content of the invention
The technical problem to be solved in the present invention is, friendship is scurried into for dc bus in the DC power system of prior art
The detection means of stream, detection range can not cover DC loop HM+, KM+, the HM-/KM- often occurred in power system comprehensively
The defect that exchanges is scurried between the earth there is provided one kind is simple in construction, and the direct current often occurred in power system can be covered
The detection dress that dc bus in the DC power system exchanged scurries into exchange is scurried between loop HM+, KM+, HM-/KM- and the earth
Put.
The technical solution adopted for the present invention to solve the technical problems is：Construct dc bus in a kind of DC power system
The detection means of exchange is scurried into, including：
Partial pressure sampling module, the partial pressure sampling module first end connection closing bus bar just or control bus just, it is described
The second end connection closing bus bar of partial pressure sampling module is negative and/or control bus is negative, the 3rd termination of the partial pressure sampling module
Greatly, the sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure is sampled
Module includes the company of the first balance resistor bridge and the second balance resistor bridge, the first balance resistor bridge and the second balance resistor bridge
Contact is the 3rd end of the partial pressure sampling module；The first balance resistor bridge is the first balance resistance, second balance
Resistor bridge is made up of the second balance resistance and the 3rd balance resistance；
Amplification module is extracted in exchange, for extracting the alternating component in the sampled signal to generate ac sampling signal simultaneously
Amplify the ac sampling signal；
ADC modular converters, for the ac sampling signal of the amplification to be converted into data signal；
The partial pressure sampling module is output as the voltage output at the two ends of the 3rd balance resistance；
The first end of first balance resistance connects negative electrode of the control bus just with silicon chain, the anode of the silicon chain
Connect the closing bus bar just；The the second end connection the earth and the first end of the second balance resistance of first balance resistance；Institute
Born through the 3rd balance resistance connection closing bus bar is negative with the control bus at the second end for stating the second balance resistance.
The technical solution adopted for the present invention to solve the technical problems is：Construct dc bus in a kind of DC power system
The detection means of exchange is scurried into, including：
Partial pressure sampling module, the partial pressure sampling module first end connection closing bus bar just or control bus just, it is described
The second end connection closing bus bar of partial pressure sampling module is negative and/or control bus is negative, the 3rd termination of the partial pressure sampling module
Greatly, the sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure is sampled
Module includes the company of the first balance resistor bridge and the second balance resistor bridge, the first balance resistor bridge and the second balance resistor bridge
Contact is the 3rd end of the partial pressure sampling module；The first balance resistor bridge is the first balance resistance, second balance
Resistor bridge is made up of the second balance resistance and the 3rd balance resistance；
Amplification module is extracted in exchange, for extracting the alternating component in the sampled signal to generate ac sampling signal simultaneously
Amplify the ac sampling signal；
ADC modular converters, for the ac sampling signal of the amplification to be converted into data signal；
The partial pressure sampling module is output as the voltage output at the two ends of the 3rd balance resistance；
The first end connection closing bus bar of first balance resistance is negative and the control bus is born, and described first is flat
Weigh the second end connection the earth of resistance and the first end of second balance resistance；Second end of second balance resistance is through institute
State the 3rd balance resistance and connect anode of the closing bus bar just with silicon chain, the negative electrode of the silicon chain connects the control bus
Just.
The technical solution adopted for the present invention to solve the technical problems is：Construct dc bus in a kind of DC power system
The detection means of exchange is scurried into, including：
Partial pressure sampling module, the partial pressure sampling module first end connection closing bus bar just or control bus just, it is described
The second end connection closing bus bar of partial pressure sampling module is negative and/or control bus is negative, the 3rd termination of the partial pressure sampling module
Greatly, the sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure is sampled
Module includes the company of the first balance resistor bridge and the second balance resistor bridge, the first balance resistor bridge and the second balance resistor bridge
Contact is the 3rd end of the partial pressure sampling module；The first balance resistor bridge is the first balance resistance, second balance
Resistor bridge is made up of the second balance resistance and the 3rd balance resistance；
Amplification module is extracted in exchange, for extracting the alternating component in the sampled signal to generate ac sampling signal simultaneously
Amplify the ac sampling signal；
ADC modular converters, for the ac sampling signal of the amplification to be converted into data signal；
The partial pressure sampling module is output as the voltage output at the two ends of the 3rd balance resistance；
The first end connection closing bus bar of first balance resistance is negative and the control bus is born, and described first is flat
Weigh the second end connection the earth of resistance and the first end of second balance resistance；Second end of second balance resistance is through institute
State the 3rd balance resistance and connect negative electrode of the control bus just with silicon chain, the anode of the silicon chain connects the closing bus bar
Just.
The technical solution adopted for the present invention to solve the technical problems is：Construct dc bus in a kind of DC power system
The detection means of exchange is scurried into, including：
Partial pressure sampling module, the partial pressure sampling module first end connection closing bus bar just or control bus just, it is described
The second end connection closing bus bar of partial pressure sampling module is negative and/or control bus is negative, the 3rd termination of the partial pressure sampling module
Greatly, the sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure is sampled
Module includes the company of the first balance resistor bridge and the second balance resistor bridge, the first balance resistor bridge and the second balance resistor bridge
Contact is the 3rd end of the partial pressure sampling module；The first balance resistor bridge is the first balance resistance, second balance
Resistor bridge is made up of the second balance resistance and the 3rd balance resistance；
Amplification module is extracted in exchange, for extracting the alternating component in the sampled signal to generate ac sampling signal simultaneously
Amplify the ac sampling signal；
ADC modular converters, for the ac sampling signal of the amplification to be converted into data signal；
The partial pressure sampling module is output as the voltage output at the two ends of the 3rd balance resistance；
The first end of first balance resistance connects anode of the closing bus bar just with silicon chain, the negative electrode of the silicon chain
Connect the control bus just；The the second end connection the earth and the first end of the second balance resistance of first balance resistance；Institute
Born through the 3rd balance resistance connection closing bus bar is negative with the control bus at the second end for stating the second balance resistance.
Dc bus is scurried into the detection means of exchange in the DC power system of the present invention, and amplification is extracted in the exchange
Module includes capacitance, reference resistance and operational amplifier, and the first end of the capacitance connects the partial pressure sampling mould
The sampled output of block, the second end of the capacitance connect the normal phase input end of the operational amplifier, the fortune
The inverting input for calculating amplifier connects the output end of the operational amplifier, and the first end of the reference resistance connects the fortune
The normal phase input end of amplifier is calculated, the second end of the reference resistance is with connecting sampled signal.
Dc bus is scurried into the detection means of exchange in the DC power system of the present invention, and amplification is extracted in the exchange
Module also includes filter capacitor and filter resistance, and the defeated of amplification module is extracted in the first end connection exchange of the filter capacitor
Go out end, second end connection sampled signal of the filter capacitor；The filter resistance connects the output of the operational amplifier
Hold and the output end for exchanging extraction amplification module.
Dc bus is scurried into the detection means of exchange in the DC power system of the present invention, the DC power system
The detection means that middle dc bus scurries into exchange also includes being used to receive, reports the data signal and the processing module alerted.
Implement dc bus in the DC power system of the present invention and scurry into the detection means of exchange, can cover comprehensively HM+,
The exchange of HM-, KM+, KM- to the earth is scurried into, and its partial pressure sampling module only includes in insulation detection device use three
Resistor bridge is balanced, its circuit structure is simple, can sample all AC signals in single bridge arm, while reducing to device parameters
Requirement.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the closing bus bar of prior art and the connection diagram of control bus；
Fig. 2 is the schematic diagram that exchange is scurried between HM+ and the earth；
Fig. 3 is the schematic diagram that exchange is scurried between KM+ and the earth
Fig. 4 is the schematic diagram that exchange is scurried between HM-/KM- and the earth；
Fig. 5 be prior art DC power system in dc bus scurry into exchange detection means circuit theory diagrams；
Fig. 6 be the present invention DC power system in dc bus scurry into exchange detection means theory diagram；
Fig. 7 is the circuit theory diagrams of the first embodiment of the partial pressure sampling module of the present invention；
Fig. 8 a are circuit diagram of the partial pressure sampling module when exchange directly scurries into KM+ shown in Fig. 7；
Fig. 8 b are equivalent model figure of the partial pressure sampling module when exchange directly scurries into KM+ shown in Fig. 7；
Fig. 8 c are that the partial pressure sampling module shown in Fig. 7 directly scurries into KM+ in exchange and disconnects the equivalent circuit diagram of silicon chain；
Fig. 9 a are circuit diagram of the partial pressure sampling module when exchange directly scurries into KM- shown in Fig. 7；
Fig. 9 b are equivalent model figure of the partial pressure sampling module when exchange directly scurries into KM- shown in Fig. 7；
Fig. 9 c are that the partial pressure sampling module shown in Fig. 7 directly scurries into KM- in exchange and disconnects the equivalent circuit diagram of silicon chain；
Figure 10 a are circuit diagram of the partial pressure sampling module when exchange directly scurries into HM+ shown in Fig. 7；
Figure 10 b are equivalent model figure of the partial pressure sampling module when exchange directly scurries into HM+ shown in Fig. 7；
Figure 11 is the circuit theory diagrams that the first embodiment of amplification module is extracted in the exchange of the present invention；
Figure 12 be the present invention DC power system in dc bus scurry into exchange detection means first embodiment
Circuit theory diagrams；
Figure 13 be the present invention DC power system in dc bus scurry into exchange detection means second embodiment
Circuit theory diagrams；
Figure 14 be the present invention DC power system in dc bus scurry into exchange detection means 3rd embodiment
Circuit theory diagrams；
Figure 15 be the present invention DC power system in dc bus scurry into exchange detection means fourth embodiment
Circuit theory diagrams.
Figure 16 be the present invention DC power system in dc bus scurry into exchange detection means the 5th embodiment
Circuit theory diagrams.
Embodiment
As shown in fig. 6, dc bus scurries into the detection means 100 of exchange including dividing in the DC power system of the present invention
Sampling module 110, exchange is pressed to extract amplification module 120 and ADC modular converters 130.As shown in fig. 6, the partial pressure sampling module
The 110 first end connection positive HM+ of the closing bus bar or positive KM+ of control bus.The second end connection of the partial pressure sampling module 110 is closed
Lock bus bears HM- and control bus bears KM-.The 3rd end ground connection of the partial pressure sampling module 110.Thus partial pressure sampling module
110 pairs of positive HM+ of closing bus bar, the positive KM+ of control bus, closing bus bars bear the voltage progress of HM- and the negative KM- of control bus to the earth
Partial pressure and sampling, finally output include the sampled signal of alternating component.Amplification module 120 and partial pressure sampling mould are extracted in exchange
The sampled output connection of block 110, so as to receive the sampled signal, and extracts the alternating component in the sampled signal to generate
Ac sampling signal simultaneously amplifies the ac sampling signal.The ADC modular converters 130 connect the exchange and extract amplification module
120 so that receive the ac sampling signal of amplification, and convert thereof into data signal.
Here, the partial pressure sampling module 100 includes the first balance resistor bridge and the second balance resistor bridge.Described first is flat
The tie point ground connection of weighing apparatus resistor bridge and the second balance resistor bridge；The first balance resistor bridge is the first balance resistance, described the
Two balance bridges are made up of the second balance resistance and the 3rd balance resistance.In the present invention, the resistance of the first balance resistor bridge
Value is at or about the resistance value of the described second balance resistor bridge.Those skilled in the art know that partial pressure of the invention is sampled
The first of the insulation detection device that module 100 be able to must be used using existing DC power system balances resistor bridge and the
Two balance resistor bridges to build.
The exchange is extracted amplification module 120 and can built using existing capacitance and amplifying circuit, can also adopt
Built with other circuits as known in the art.
Therefore, implement the detection means that dc bus in the DC power system of the present invention scurries into exchange, can cover comprehensively
The exchange of HM+, HM-, KM+, KM- to the earth is covered to scurry into,
Fig. 7 is the circuit theory diagrams of the first embodiment of the partial pressure sampling module of the present invention.As shown in fig. 7, the partial pressure
Sampling module includes the first balance resistor bridge and the second balance resistor bridge.The first balance resistor bridge is resistance R1, described the
Two balance bridges are made up of resistance R2 and R2ac.Wherein resistance R1 resistance value is approximately equal to resistance R2 and R2ac resistance value sum.
As shown in fig. 7, resistance R1 first end connects the negative electrode of the positive KM+ of control bus and silicon chain D1.The anode of the silicon chain D1
Connect the positive HM+ of the closing bus bar.Resistance R1 the second end connection the earth and resistance R2 first end.The second of the resistance R2
End also bears HM- through the resistance R2ac connections closing bus bar and control bus bears KM-.Thus, sampled signal can be from electricity
Hinder the sampled point at R2ac two ends, closing bus bar and bear HM- and the negative KM- acquisitions of control bus.
Below, sampling of the partial pressure sampling module shown in Fig. 7 in resistance R2ac will be illustrated with reference to Fig. 8 a-c, 9a-c, 10a-b
Just the alternating component of HM+, KM+, HM-/KM- relative to the earth can be adopted on point.
(1) KM+ is directly scurried into exchange
As shown in Figure 8 a, the voltage between closing bus bar positive and negative HM+ and HM- is V1, and exchange scurries into voltage for V2, R2+
R2ac is resistance values of the KM- to balance the resistor bridge R2 and R2ac of the earth, and R1 is resistance of the KM+ to the balance resistance R1 of the earth
Value, R1=R2+R2ac.In this embodiment it is assumed that the control bus external load RL of DC power system resistance value is
RL.When RL meets certain condition, silicon chain D1 is equivalent into a constant pressure source, it is assumed that the pressure drop at its two ends is V3.Now, by Fig. 8 a institutes
The circuit equivalent processing shown, obtains equivalent circuit as shown in Figure 8 b.Principle of stacking is now utilized, resistance R2ac two ends can be obtained
Voltage, i.e., partial pressure sampling module output the sampled signal Vsample containing alternating component be：
VSample=R2ac (V1-V3+V2)/(R2+R2ac).
Wherein contain alternating voltage V2s of the KM+ to the earth.
Here, when RL meets condition RL<(V1-V3) during * (R2+R2ac)/(V3-V1-V2), silicon chain D1 side can be used as perseverance
Potential source, is derived as follows.As shown in Figure 8 c, silicon chain two ends are disconnected, when open-circuit voltage UAB is more than silicon chain conduction voltage drop, silicon chain
Perseverance conducting, then at this moment can silicon chain is equivalent into a constant pressure source.The open-circuit voltage at AB two ends is obtained out with principle of stacking,
UAB=V1+V2*RL/ (RL+R2+R2ac)
Work as UAB>During V3, the conducting of silicon chain can be equivalent to voltage source.Therefore RL is less than what is calculated by the above method
Value.In actual applications, load RL can substantially meet above-mentioned calculating income value.In the present embodiment, for 220V direct currents
System, balance bridge resistance selection R2+R2ac=R1=100k, as long as RL value is less than 140k and just can meet above-mentioned equivalent, and
RL in real system is far smaller than this value, thus it is above-mentioned it is equivalent can be with commonly used.
(2) when exchange directly scurries into KM-
Now, silicon chain is similarly equivalent to voltage source, can solve the output of partial pressure sampling module contains alternating component
Sampled signal Vsample,
VSample=R2ac*V2/ (R2+R2ac),
Include alternating voltage V2s of the KM- to the earth in VSample
Same calculate obtains silicon chain two ends open-circuit voltage：UAB=V1+V2*RL/ (RL+R2+R2ac)
Work as UAB>Can silicon chain is equivalent into constant pressure source during V3, it is seen that when KM- scurries into exchange, meet the RL of equivalent condition
It is identical to be scurried into KM+ when exchanging.
(3) when exchange directly scurries into HM+
Because KM- and HM- are electrical connections, just do not consider further that HM- scurries into the situation of exchange here, only consider that HM+ is altered
Enter exchange.HM+ scurries into the schematic diagram of exchange as shown in Figure 10 a, and silicon chain is equally equivalent to the constant pressure source that voltage is V3 herein
Processing, equivalent circuit diagram such as Figure 10 b can obtain R2ac both end voltages, i.e. partial pressure according to the circuit after equivalent by superposition theorem
The sampled signal Vsample containing alternating component of sampling module output,
VSample=V1+V2*RL/ (RL+R2+R2ac)
UAB equally need to be made by calculating the open-circuit voltage UAB at silicon chain two ends>V3 meets the RL of equivalent condition to obtain.Meter
Now UAB=V1*R1/ (R1+RL)+V2*RL/ (RL+R2+R2ac) is calculated to obtain, when the RL values that this formula is calculated meet UAB>During V3 etc.
Model is imitated to set up.
Analyzed more than, the sampled signal obtained from the sampled point at R2ac contains common alternating component V2*
RL/ (RL+R2+R2ac), as long as so carrying out blocking filtering to sampled signal, you can ac signal acquisition is arrived.Actually should
In, as long as the need of foregoing circuit equivalent model can be met by selecting the KM in suitable balance bridge resistance value, system to load RL
Ask.
Figure 11 is the circuit theory diagrams that the first embodiment of amplification module is extracted in the exchange of the present invention.As shown in figure 11, institute
Stating exchange extraction amplification module includes capacitance C1, reference resistance R5, operational amplifier U1, filter resistance R4 and filter capacitor
C2.As shown in figure 11, the first end of the capacitance C1 connects the sampled output of the partial pressure sampling module.It is described
Capacitance C1 the second end connects the normal phase input end of the operational amplifier U1.The anti-phase input of the operational amplifier U1
End connection operational amplifier U1 output end.The first end of the reference resistance R5 is connecting the operational amplifier U1 just
Phase input, the second end connection sampled signal ground GND of the reference resistance R5.The first end connection institute of the filter capacitor C2
State exchange with extracting the output end of amplification module, the second end connection sampled signal GND.The filter resistance R4 connections computing
Amplifier U1 output end and the exchange are extracted between the output end of amplification module.
As shown in figure 11, capacitance C1 be used for filter out from partial pressure sampling module obtain sampled signal in direct current into
Point.Operational amplifier U1 as voltage follower, strengthens the load capacity of Sample AC signal herein.Filter resistance R4 and filtering
Electric capacity C2 composition RC filtering links, filter out the high-frequency noise in Sample AC signal.
The circuit course of work is as follows：Sampled signal from partial pressure sampling module, is filtered through capacitance, filter out direct current into
Point, extract AC signal；AC signal is output to ADC modular converters after voltage follower and RC filter circuits.In this portion
Capacitance C1 has been placed on after partial pressure sampling module in parallel circuit, is greatly reduced in the resistance to pressure request of electric capacity, this circuit and is selected
The capacitance parameter selected is 25V/1uF.
Figure 12 be the present invention DC power system in dc bus scurry into exchange detection means first embodiment
Circuit theory diagrams.As shown in figure 12, dc bus scurries into the detection means of exchange including electric in DC power system of the invention
Hinder R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein
Resistance R1 resistance value is approximately equal to resistance R2 and R2ac resistance value sum.As shown in figure 12, resistance R1 first end connection institute
State closing bus bar positive HM+ and thyristor diode D1 anode.The negative electrode connection control of the thyristor diode D1 is female
The positive KM+ of line.Resistance R1 the second end connection the earth and resistance R2 first end.The second end of the resistance R2 is through the resistance
The R2ac connections closing bus bar bears HM- and control bus bears KM-, and the sampled signal is R2ac both end voltages.What is obtained adopts
Sample signal is supplied to capacitance through the sampled point at resistance R2ac.Capacitance filters out the sampling obtained from partial pressure sampling module
Flip-flop in signal, then provide it to operational amplifier.Operational amplifier module U11 herein as voltage follower,
Strengthen the load capacity of Sample AC signal.Those skilled in the art know that operational amplifier module U11 may include one or number
Individual operational amplifier.The AC signal of output is supplied to ADC modular converters 130, and it carries out numeral to the AC signal collected
Change is handled, and AC signal is turned into the accessible data of processor module 140.The data signal of 140 pairs of acquisitions of processor module
Recorded, reported and alerted.In one embodiment of the invention, the processor module 140 is DSP
TMS320F28033PNT。
Figure 13 be the present invention DC power system in dc bus scurry into exchange detection means second embodiment
Circuit theory diagrams.As shown in figure 13, dc bus scurries into the detection means of exchange including electric in DC power system of the invention
Hinder R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein
Resistance R1 resistance value is approximately equal to resistance R2 and R2ac resistance value sum.The implementation shown in embodiment and Figure 12 shown in Figure 13
The difference of example is resistance R1, resistance R2 and R2ac and the positive and negative HM+/HM- of closing bus bar and the positive and negative KM+/KM- of control bus company
Connect relation.As shown in figure 13, resistance R1 first end connects the closing bus bar and born and the negative HM-/KM- of the control bus, electricity
Hinder R1 the second end connection the earth and resistance R2 first end.Closed a floodgate through resistance R2ac connections are described at the second end of the resistance R2
The positive HM+ of bus and silicon chain D1 anode, the two ends of the resistance R2ac are the output of the partial pressure sampling element.The silicon chain D1
Negative electrode connect the positive KM+ of control bus.The sampled signal of acquisition is supplied to capacitance through resistance R2ac two ends.Blocking electricity
Flip-flop in holding the sampled signal for filtering out and being obtained from partial pressure sampling module, then provide it to operational amplifier.Computing is put
Big device module U11 strengthens the load capacity of Sample AC signal herein as voltage follower.The AC signal of output is supplied to
ADC modular converters 130, it is digitized processing to the AC signal collected, AC signal is turned into processor module 140
Accessible data.The data signal of 140 pairs of acquisitions of processor module is recorded, reported and alerted.At one of the present invention
In embodiment, the processor module 140 is DSP TMS320F28033PNT.
Figure 14 be the present invention DC power system in dc bus scurry into exchange detection means 3rd embodiment
Circuit theory diagrams.As shown in figure 14, dc bus scurries into the detection means of exchange including electric in DC power system of the invention
Hinder R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein
Resistance R1 resistance value is approximately equal to resistance R2 and R2ac resistance value sum.The implementation shown in embodiment and Figure 12 shown in Figure 14
The difference of example is resistance R1, resistance R2 and R2ac and the positive and negative HM+/HM- of closing bus bar and the positive and negative KM+/KM- of control bus company
Connect relation.As shown in figure 14, resistance R1 first end connects the closing bus bar and born and the negative HM-/KM- of the control bus, electricity
Hinder R1 the second end connection the earth and resistance R2 first end.The second end of the resistance R2 for the partial pressure sampling module institute
State sampled output and the negative electrode through the positive KM+ of the resistance R2ac connections control bus and silicon chain D1.The anode of the silicon chain D1
Connect the positive KM+ of the control bus.The sampled signal of acquisition is supplied to capacitance through the sampled point at resistance R2ac.Blocking electricity
Flip-flop in holding the sampled signal for filtering out and being obtained from partial pressure sampling module, then provide it to operational amplifier.Computing is put
Big device module U11 strengthens the load capacity of Sample AC signal herein as voltage follower.The AC signal of output is supplied to
ADC modular converters 130, it is digitized processing to the AC signal collected, AC signal is turned into processor module 140
Accessible data.The data signal of 140 pairs of acquisitions of processor module is recorded, reported and alerted.At one of the present invention
In embodiment, the processor module 140 is DSP TMS320F28033PNT.
Figure 15 be the present invention DC power system in dc bus scurry into exchange detection means fourth embodiment
Circuit theory diagrams.As shown in figure 15, dc bus scurries into the detection means of exchange including electric in DC power system of the invention
Hinder R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein
Resistance R1 resistance value is approximately equal to resistance R2 and R2ac resistance value sum.The difference of embodiment shown in Figure 15 and Figure 12-14
It is, the detection means shown in Figure 15 is applied to only include the positive and negative HM+/HM- of closing bus bar DC power system.Such as Figure 15 institutes
Show, resistance R1 first end connects the positive HM+ of closing bus bar.Resistance R1 the second end connection the earth and the first of resistance R2
End.HM- is born through the resistance R2ac connections closing bus bar in resistance R2 the second end.
Figure 16 be the present invention DC power system in dc bus scurry into exchange detection means the 5th embodiment
Circuit theory diagrams.As shown in figure 16, dc bus scurries into the detection means of exchange including electric in DC power system of the invention
Hinder R1, resistance R2 and R2ac, capacitance, operational amplifier module U11, ADC modular converter 130, processing module 140.Wherein
Resistance R1 resistance value is approximately equal to resistance R2 and R2ac resistance value sum.The difference of embodiment shown in Figure 16 and Figure 12-14
It is, the detection means shown in Figure 16 is applied to only include the positive and negative KM+/KM- of control bus DC power system.Such as Figure 16 institutes
Show, resistance R1 first end connects the positive KM+ of control bus.Resistance R1 the second end connection the earth and the first of resistance R2
End.KM- is born through the resistance R2ac connections control bus in resistance R2 the second end.
Those skilled in the art know, in addition to the embodiment shown in Figure 12-16, and those skilled in the art will can scheme
The exchange shown in the partial pressure sampling module that is shown in 7, Figure 11 is extracted amplification module 120 and combined, or by its with Figure 12-14
The embodiment shown is combined, changes to obtain other embodiments.And the operation principle and process of these embodiments can
The description carried out with reference picture 8a-10b.
In addition, implementing the detection means that dc bus in DC power system of the invention scurries into exchange, it can cover comprehensively
The exchange of HM+, HM-, KM+, KM- to the earth is covered to scurry into, and its partial pressure sampling module only includes using in insulation detection device
Three balance resistor bridges, its circuit structure is simple, and can sample all AC signals in single bridge arm, while reducing to device
The requirement of part parameter.
Although the present invention is illustrated by specific embodiment, it will be appreciated by those skilled in the art that, do not departing from
In the case of the scope of the invention, various conversion and equivalent substitute can also be carried out to the present invention.Therefore, the present invention is not limited to institute
Disclosed specific embodiment, and whole embodiments for falling within the scope of the appended claims should be included.
Claims (7)
1. dc bus scurries into the detection means of exchange in a kind of DC power system, it is characterised in that including：
Partial pressure sampling module, the partial pressure sampling module first end connection closing bus bar just or control bus just, the partial pressure
The second end connection closing bus bar of sampling module is negative and/or control bus is negative, the 3rd termination the earth of the partial pressure sampling module,
The sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure sampling module bag
The first balance resistor bridge and the second balance resistor bridge are included, the first balance resistor bridge and the second tie point for balancing resistor bridge are
3rd end of the partial pressure sampling module；The first balance resistor bridge is the first balance resistance, the second balance resistor bridge
It is made up of the second balance resistance and the 3rd balance resistance；
Amplification module is extracted in exchange, for extracting the alternating component in the sampled signal to generate ac sampling signal and amplify
The ac sampling signal；
ADC modular converters, for the ac sampling signal of the amplification to be converted into data signal；
The partial pressure sampling module is output as the voltage output at the two ends of the 3rd balance resistance；First balance resistance
First end connect the negative electrode of the control bus just with silicon chain, the anode of the silicon chain is connecting the closing bus bar just；It is described
The the second end connection the earth and the first end of the second balance resistance of first balance resistance；The second end warp of second balance resistance
It is negative negative with the control bus that 3rd balance resistance connects the closing bus bar.
2. dc bus scurries into the detection means of exchange in a kind of DC power system, it is characterised in that including：
Partial pressure sampling module, the partial pressure sampling module first end connection closing bus bar just or control bus just, the partial pressure
The second end connection closing bus bar of sampling module is negative and/or control bus is negative, the 3rd termination the earth of the partial pressure sampling module,
The sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure sampling module bag
The first balance resistor bridge and the second balance resistor bridge are included, the first balance resistor bridge and the second tie point for balancing resistor bridge are
3rd end of the partial pressure sampling module；The first balance resistor bridge is the first balance resistance, the second balance resistor bridge
It is made up of the second balance resistance and the 3rd balance resistance；
Amplification module is extracted in exchange, for extracting the alternating component in the sampled signal to generate ac sampling signal and amplify
The ac sampling signal；
ADC modular converters, for the ac sampling signal of the amplification to be converted into data signal；
The partial pressure sampling module is output as the voltage output at the two ends of the 3rd balance resistance；
The first end of first balance resistance connects the closing bus bar and bears, the first balance electricity negative with the control bus
The the second end connection the earth and the first end of second balance resistance of resistance；Second end of second balance resistance is through described
Three balance resistances connect anode of the closing bus bar just with silicon chain, and the negative electrode of the silicon chain is connecting the control bus just.
3. dc bus scurries into the detection means of exchange in a kind of DC power system, it is characterised in that including：
Partial pressure sampling module, the partial pressure sampling module first end connection closing bus bar just or control bus just, the partial pressure
The second end connection closing bus bar of sampling module is negative and/or control bus is negative, the 3rd termination the earth of the partial pressure sampling module,
The sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure sampling module bag
The first balance resistor bridge and the second balance resistor bridge are included, the first balance resistor bridge and the second tie point for balancing resistor bridge are
3rd end of the partial pressure sampling module；The first balance resistor bridge is the first balance resistance, the second balance resistor bridge
It is made up of the second balance resistance and the 3rd balance resistance；
Amplification module is extracted in exchange, for extracting the alternating component in the sampled signal to generate ac sampling signal and amplify
The ac sampling signal；
ADC modular converters, for the ac sampling signal of the amplification to be converted into data signal；
The partial pressure sampling module is output as the voltage output at the two ends of the 3rd balance resistance；
The first end of first balance resistance connects the closing bus bar and bears, the first balance electricity negative with the control bus
The the second end connection the earth and the first end of second balance resistance of resistance；Second end of second balance resistance is through described
Three balance resistances connect negative electrode of the control bus just with silicon chain, and the anode of the silicon chain is connecting the closing bus bar just.
4. dc bus scurries into the detection means of exchange in a kind of DC power system, it is characterised in that including：
Partial pressure sampling module, the partial pressure sampling module first end connection closing bus bar just or control bus just, the partial pressure
The second end connection closing bus bar of sampling module is negative and/or control bus is negative, the 3rd termination the earth of the partial pressure sampling module,
The sampled output output of the partial pressure sampling module includes the sampled signal of alternating component, wherein the partial pressure sampling module bag
The first balance resistor bridge and the second balance resistor bridge are included, the first balance resistor bridge and the second tie point for balancing resistor bridge are
3rd end of the partial pressure sampling module；The first balance resistor bridge is the first balance resistance, the second balance resistor bridge
It is made up of the second balance resistance and the 3rd balance resistance；
Amplification module is extracted in exchange, for extracting the alternating component in the sampled signal to generate ac sampling signal and amplify
The ac sampling signal；
ADC modular converters, for the ac sampling signal of the amplification to be converted into data signal；
The partial pressure sampling module is output as the voltage output at the two ends of the 3rd balance resistance；
The first end of first balance resistance connects anode of the closing bus bar just with silicon chain, the negative electrode connection of the silicon chain
The control bus is just；The the second end connection the earth and the first end of the second balance resistance of first balance resistance；Described
It is negative negative with the control bus that second end of two balance resistances connects the closing bus bar through the 3rd balance resistance.
5. dc bus scurries into exchange in the DC power system according to any one claim in claim 1-4
Detection means, it is characterised in that amplification module is extracted in the exchange includes capacitance, reference resistance and operational amplifier, institute
The first end for stating capacitance connects the sampled output of the partial pressure sampling module, the second end of the capacitance connects
The normal phase input end of the operational amplifier is connect, the inverting input of the operational amplifier connects the defeated of the operational amplifier
Go out end, the first end of the reference resistance connects the normal phase input end of the operational amplifier, the second end of the reference resistance
With connecting sampled signal.
6. dc bus scurries into the detection means of exchange in DC power system according to claim 5, it is characterised in that
Amplification module is extracted in the exchange also includes filter capacitor and filter resistance, and the first end of the filter capacitor connects the exchange
With extracting output end, the second end connection sampled signal of the filter capacitor of amplification module；The filter resistance connection is described
The output end of operational amplifier and the output end for exchanging extraction amplification module.
7. dc bus scurries into the detection means of exchange in DC power system according to claim 6, it is characterised in that
Dc bus scurries into the detection means of exchange also including being used to receive, report the data signal simultaneously in the DC power system
The processing module of alarm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105140882B (en) * | 2015-08-27 | 2018-03-16 | 国网上海市电力公司 | A kind of transformer station direct current system exchanges intrusion protection device |
| 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 |
| CN106786467B (en) * | 2017-02-20 | 2018-11-20 | 广西电网有限责任公司柳州供电局 | Fault warning and device for preventing unwanted operation are scurried into a kind of exchange |
| CN107677906B (en) * | 2017-09-30 | 2020-06-09 | 江苏方天电力技术有限公司 | Transformer substation direct current system fault detection circuit and detection method |
| CN107741573B (en) * | 2017-10-24 | 2019-12-13 | 国网山西省电力公司电力科学研究院 | Applying device and applying method for fleeing-in alternating current in direct-current power supply system of transformer substation |
| CN110579647B (en) * | 2019-07-26 | 2020-10-09 | 中国南方电网有限责任公司超高压输电公司梧州局 | Control protection system with insulation monitoring and active prevention functions |
| CN111193383A (en) * | 2020-01-22 | 2020-05-22 | 维沃移动通信有限公司 | Power control circuit and electronic device |
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