CN109828222A - Insulating ground fault simulation unit - Google Patents
Insulating ground fault simulation unit Download PDFInfo
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- CN109828222A CN109828222A CN201910179948.0A CN201910179948A CN109828222A CN 109828222 A CN109828222 A CN 109828222A CN 201910179948 A CN201910179948 A CN 201910179948A CN 109828222 A CN109828222 A CN 109828222A
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Abstract
The present invention relates to transforming plant DC power-supply system O&M monitoring fields, more particularly to a kind of insulating ground fault simulation unit, including main control chip, voltage acquisition module, communication module, bus and branch input control module, bus and branch insulation reduce and are grounded control module, control module is scurried into exchange, direct current mutually alters control module, distribution capacity increases module over the ground, the voltage acquisition module and communication module are connected to main control chip, bus and branch insulation are connected in the bus and the control of branch input control module reduces and is grounded control module, the bus and branch insulation reduce and are grounded control module, control module is scurried into exchange and direct current mutually alters control module and is connected to main control chip by light-coupled isolation module.The automatic imitation of DC power supply various faults can be achieved in the present invention, promotes operation maintenance personnel investigation and problem-solving ability, guarantees substation safety operation.
Description
Technical field
The present invention relates to transforming plant DC power-supply system O&M monitoring fields, and in particular to a kind of insulating ground fault simulation
Unit.
Background technique
DC power system is Substation control protection, automation equipment, high-voltage circuit-breaker switching on-off mechanism, signal are set
The vital power supply of the equipment such as standby, emergency lighting is the important equipment of substation." the heart of the DC power system as substation
It is dirty ", most important to substation safety reliability service, the system failure may cause whole transformer station and lose power supply, jeopardize power transformation
It stands and electric power netting safe running.
In recent years, the importance of the safe and reliable operation of DC power system is had realized that in industry.After exchanging power loss,
There are failures for DC power system, cannot provide safely and reliably power supply to substation, lead to substation's power loss, so substation
Reinforce the operation and maintenance to DC power system, periodically to equipment routing inspection, test, guarantees substation safety operation.
Currently, there are many fault types for DC power system, wherein insulating ground failure may cause protection and automatic dress
Malfunction is set, relay protection, signal, automatic device malfunction or tripping is caused, DC insurance is caused to fuse, makes protection and automatic dress
Set, control loop loses power supply, will cause certain relays what is more and be shorted, cannot be operating normally, cause overstepping, cause
Fault spread.Insulating ground failure occurs more frequent in substation, maintenance and solves that speed is slower, and causing to go wrong cannot
Effectively and rapidly solve.So reinforcing insulating ground malfunction elimination, operation maintenance personnel's investigation and resolution ability are promoted, is guaranteed
Substation safety operation.
Summary of the invention
In order to solve the above technical problems, it is an object of the invention to: a kind of insulating ground fault simulation unit is provided, it can be real
The automatic imitation of existing DC power supply various faults promotes operation maintenance personnel investigation and problem-solving ability, guarantees substation safety
Operation.
The present invention is technical solution used by solving its technical problem are as follows:
The insulating ground fault simulation unit, including main control chip, voltage acquisition module, communication module, bus and branch
Road input control module, bus and branch insulation reduce and are grounded control module, exchange and scurry into control module, direct current and mutually alter control
Module, over the ground distribution capacity increase module, and the voltage acquisition module and communication module are connected to main control chip, the bus
It is controlled with branch input control module and connects bus and branch insulation reduction and be grounded control module, the bus and branch insulation
It reduces and ground connection control module, exchange scurries into control module and direct current and mutually alter control module and be connected to master by light-coupled isolation module
Chip is controlled, bus and branch insulation are connected in bus and the control of branch input control module reduces and be grounded control module.
The present invention is in use, be connected to bus and branch input control module for I sections of buses of DC power system or branch
Corresponding connection terminal, bus or tributary signal are connected by bus and branch input control module by voltage acquisition module
To main control chip, and then acquire bus or branch voltage, bus or the positive voltage-to-ground of branch, bus or the negative voltage-to-ground of branch；
I sections of buses of DC power system or branch are connected to bus connection terminal corresponding with branch input control module, bus or
Tributary signal is reduced and is grounded control module and optocoupler by bus and branch insulation by bus and branch input control module
Isolation module realizes bus and the simulation of grounding Resistance Fault；By I sections of buses of DC power system, two branches or three branch
Road is connected to the connection terminal of equipment, bus or tributary signal by bus and branch input control module, by DC power supply system
The II section bus of system is connected to the connection terminal of equipment, mutually alters control module by direct current, realizes that the direct current of bus and branch is mutual
Alter fault simulation；By I sections of buses of DC power system, two branches or three branches, it is connected to the connection terminal of equipment, bus
Or tributary signal scurries into control module by exchange, realizes the friendship of bus and branch by bus and branch input control module
Flee into fault simulation；I sections of buses of DC power system are connected to equipment connection terminal, bus is inputted by bus and branch
Control module increases module by distribution capacity over the ground, realizes that distribution capacity increases fault simulation to bus over the ground；Communication module is used
Communication between realization equipment and host computer.
Wherein, preferred embodiment are as follows:
The voltage acquisition module passes sequentially through AD conversion module and digital isolation module is connected to main control chip.
The voltage acquisition module includes balanced bridge circuit, voltage follower circuit and operational amplification circuit, bus and branch
Voltage, bus and the positive voltage-to-ground of branch, bus and the negative voltage-to-ground of branch pass through after balanced bridge circuit is divided again respectively
AD conversion module is connected to by voltage follower circuit and operational amplification circuit output signal.
The bus and branch input control module include bus input port and branch input mouth, bus input port
And the positive and negative anodes of branch input mouth pass through relay respectively and are connected to positive and negative electrode bus, positive and negative electrode bus passes through relay respectively
Device is connected to DC power supply, controls connection bus or a certain branch by relay, realizes bus or a certain branch anode or negative
Pole insulation reduces and ground connection.
Above-mentioned insulating ground fault simulation unit further includes display module, and display module is connected with main control chip, shows mould
Block includes power supply instruction, equipment operation instruction, 485 transmission instructions, 485 reception instructions.
It includes relay, the concatenated ground resistance list of several groups that the bus and branch insulation, which reduce and are grounded control module,
Member and protective resistance, protective resistance and each relay normally open contact in parallel of every group of ground resistance unit, aforementioned each relay line
Circle is connected with main control chip, and the resistance value of each ground resistance unit is different, and 8 groups of ground resistance units, resistance value point is generally arranged
Not Wei 1K Ω, 2K Ω, 4K Ω, 8K Ω, 16K Ω, 32K Ω, 64K Ω and 128K Ω, each ground resistance list is controlled by relay
The switching state of member, to realize DC power system, resistance step value is 1K over the ground, and 1K- is arranged in resistance over the ground
512K, the purpose that protective resistance is arranged are to prevent bus or the positive and negative the two poles of the earth of branch while being grounded, and prevent short circuit.
The process of control module bus and the simulation of grounding Resistance Fault is reduced and is grounded by bus or branch insulation
Are as follows:
S10: host computer setting starts resistance eutral grounding fault simulation and tests initial value；
S11: setting stops resistance eutral grounding fault simulation and tests initial value；
S12: the whether enabled positive electrode resistance of setting tests initial value；
S13: setting positive electrode resistance resistance value, the setting of positive electrode resistance resistance value need to be less than or equal to 512K；
S14: the whether enabled cathode resistance test initial value of setting；
S15: setting cathode resistance, the setting of cathode resistance need to be less than or equal to 512K；
S16: setting ground resistance fault simulation testing time, fault simulation time are more than or equal to setting ground resistance failure
When the simulation test time, ground resistance fault simulation is automatically stopped；
S17: the bus or branch number that setting ground resistance fault simulation is tested, analogue ground Resistance Fault are modeled as mother
The number of line or a certain branch；
S18: host computer transmitting order to lower levels starts bus or branch insulation reduces and ground fault simulation, and bus or branch are exhausted
Edge reduces and ground fault simulation starts, and arrives until the fault simulation time, fault simulation is automatically stopped.
It should be noted that cathode resistance described in positive electrode resistance resistance value and S15 described in S13 cannot be arranged simultaneously
Less than 10K.
It includes relay K36, relay K38, relay K39, each relay coil one that control module is scurried into the exchange
End is connected to main control chip output end, relay K38 normally opened contact access exchange firewire, relay by photoelectric isolation module
The first normally opened contact of K36 and relay K39 is respectively connected to direct current positive bus input terminal and direct current negative busbar input terminal, relay
The K36 coil other end is connected to DC power supply by the second normally-closed contact of relay K39, and the relay K39 coil other end is logical
The second normally-closed contact for crossing relay K36 is connected to DC power supply.
Control module is scurried by exchange, the process of fault simulation is scurried into the exchange of realization bus and branch are as follows:
S20: host computer setting starts exchange and scurries into fault simulation test initial value；
S21: setting stops exchange and scurries into simulation test initial value；
S22: polarity initial value is scurried into setting exchange, including anode is scurried into exchange, cathode is scurried into exchange；
S23: setting exchange is scurried into the fault simulation testing time, and the fault simulation time is more than or equal to setting exchange and scurries into failure
When the simulation test time, exchange is scurried into fault simulation and is automatically stopped；
S24: the branch number of fault simulation test is scurried into setting exchange, and analog AC scurries into a certain branch of fault simulation
Number；
S25: fault simulation is scurried into host computer transmitting order to lower levels, starting exchange, and exchange is scurried into fault simulation and started, until failure
Simulated time arrives, and fault simulation is automatically stopped.
It includes relay and current-limiting resistance that the direct current, which mutually alters control module, and I section of positive bus-bar passes through current-limiting resistance and relay
Device K31 a pair of contact is respectively connected to a pair of contact of II section of negative busbar and relay K30, and first pair of relay K30
Contact is connected with I section of negative busbar, and I section of negative busbar is connected to be respectively connected to by current-limiting resistance and relay K32 a pair of contact
A pair of contact of II section of positive bus-bar and relay K29, a pair of contact of relay K29 are connected with I section of positive bus-bar, relay
Coil one end of K29-K32 is connected with main control chip output end, relay K29, K31 setting circuit interlock, relay K30,
Circuit interlock is arranged in K32.
Control module is mutually altered by direct current, realizes that the direct current of bus and branch mutually alters the process of fault simulation are as follows:
S30: host computer setting starts direct current and mutually alters fault simulation test initial value；
S31: setting stops direct current and mutually alters simulation test initial value；
S32: setting direct current mutually alters type, including I sections of bus anodes and II sections of bus anodes, I sections of bus cathode and II sections
Bus cathode, I sections of bus anodes and II sections of bus anodes and I sections of bus cathode and II sections of bus cathode, II sections of bus anodes and I
Section bus cathode, II sections of bus cathode and I sections of bus anodes, II sections of bus anodes and I sections of bus cathode and II sections of bus cathode
With I sections of buses；
S33: setting direct current is mutually altered the fault simulation testing time, and the fault simulation time is more than or equal to setting direct current and mutually alters failure
Simulation is surveyed
When trying the time, direct current is mutually altered fault simulation and is automatically stopped；
S34: setting direct current mutually alters the branch number of fault simulation test, and analog DC mutually alters a certain branch of fault simulation
Number；
S35: host computer transmitting order to lower levels, starting direct current mutually alter fault simulation, and direct current is mutually altered fault simulation and started, until failure
Simulated time arrives, and fault simulation is automatically stopped.
The distribution capacity over the ground increases module and controls the positive and negative bus of relay realization and direct-to-ground capacitance by main control chip
On-off between terminal, direct-to-ground capacitance terminal connect direct-to-ground capacitance.
By distribution capacity over the ground increase module, realize bus over the ground distribution capacity increase fault simulation process are as follows:
S40: host computer is arranged bus distributed capacitance and increases fault simulation test initial value；
S41: setting stops bus distributed capacitance and increases fault simulation test initial value；
S42: setting bus distributed capacitance increases type, including positive bus-bar direct-to-ground capacitance increases, negative busbar direct-to-ground capacitance increases
Greatly；
S43: setting bus distributed capacitance increases the fault simulation testing time, and the fault simulation time is more than or equal to setting bus
When distribution capacity increases the fault simulation testing time, bus distributed capacitance increases fault simulation and is automatically stopped；
S44: host computer transmitting order to lower levels, starting bus distributed capacitance increase fault simulation, and bus distributed capacitance increases failure
Simulation starts, and arrives until the fault simulation time, fault simulation is automatically stopped.
Compared with prior art, the invention has the following advantages:
The automatic imitation of DC power supply various faults can be achieved in the present invention, the energy for promoting operation maintenance personnel investigation and solving the problems, such as
Power guarantees substation safety operation.In use, I sections of buses of DC power system or branch are connected to bus and branch input
The corresponding connection terminal of control module, bus or tributary signal pass through voltage acquisition by bus and branch input control module
Module is connected to main control chip, and then acquires bus or negative pair of branch voltage, bus or the positive voltage-to-ground of branch, bus or branch
Ground voltage；I sections of buses of DC power system or branch are connected to bus connection terminal corresponding with branch input control module,
Bus or tributary signal are reduced and are grounded control module by bus and branch insulation by bus and branch input control module
And light-coupled isolation module realizes bus and the simulation of grounding Resistance Fault；By I sections of buses of DC power system, two branches or
Three branches are connected to the connection terminal of equipment, bus or tributary signal by bus and branch input control module, by direct current
The II section bus of power-supply system is connected to the connection terminal of equipment, mutually alters control module by direct current, realizes bus and branch
Direct current mutually alters fault simulation；By I sections of buses of DC power system, two branches or three branches, it is connected to the connecting pin of equipment
Son, bus or tributary signal scurry into control module by bus and branch input control module, by exchange, realize bus and branch
Fault simulation is scurried into the exchange on road；I sections of buses of DC power system are connected to equipment connection terminal, bus is by bus and branch
Road input control module increases module by distribution capacity over the ground, realizes that distribution capacity increases fault simulation to bus over the ground.
Detailed description of the invention
Fig. 1 is structure of the invention figure.
Fig. 2 is voltage acquisition module circuit diagram.
Fig. 3 is digital isolation module circuit diagram.
Fig. 4 is that control module circuit diagram is scurried into exchange.
Fig. 5 is that bus and branch insulation reduce and are grounded control module circuit diagram.
Fig. 6 is that direct current mutually alters control module circuit diagram.
Fig. 7 is that distribution capacity increases module circuit schematic over the ground.
Fig. 8 is bus and branch input control module circuit diagram.
Specific embodiment
The embodiment of the present invention is described further with reference to the accompanying drawing:
Embodiment 1:
As shown in Figure 1, insulating ground fault simulation unit of the present invention, including it is main control chip, voltage acquisition module, logical
Letter module, bus reduce and are grounded control module with branch input control module, bus with branch insulation, exchange and scurry into control mould
Block, direct current mutually alter control module, over the ground distribution capacity increase module, and the voltage acquisition module and communication module are connected to master
Chip is controlled, bus and branch insulation are connected in the bus and the control of branch input control module reduces and be grounded control module, institute
It states bus and branch insulation and reduces and be grounded control module, exchange to scurry into control module and direct current and mutually alter control module and pass through optocoupler
Isolation module is connected to main control chip, and bus and the control of branch input control module connect bus and branch insulation and reduces and be grounded
Control module.
Above-mentioned insulating ground fault simulation unit further includes display module, and display module is connected with main control chip, shows mould
Block includes power supply instruction, equipment operation instruction, 485 transmission instructions, 485 reception instructions.
As shown in Fig. 2, voltage acquisition module includes balanced bridge circuit, voltage follower circuit and operational amplification circuit, bus
And branch voltage, bus and the positive voltage-to-ground of branch, bus and the negative voltage-to-ground of branch pass through balanced bridge circuit respectively and are divided
AD conversion module is connected to using voltage follower circuit and operational amplification circuit output signal after pressure.Voltage acquisition module is successively
It is connected to main control chip by AD conversion module and digital isolation module, digital isolation module structure is as shown in Figure 3.
The bus and branch input control module include bus input port and branch input mouth, bus input port
And the positive and negative anodes of branch input mouth pass through relay respectively and are connected to positive and negative electrode bus, positive and negative electrode bus passes through relay respectively
Device is connected to DC power supply, as shown in figure 8, J1, J2, J3 are bus or branch input mouth, bus or branch connect through and off
Open, controlled by relay K2, K3, K4, K5, K6, K7, then by anode master control relay K9 and cathode master control after
Electric appliance K22 controls the access state of DC power supply and is controlled after each relay passes through light-coupled isolation by main control chip, realizes bus
Or a certain branch positive or negative pole insulation reduces and ground connection.
By bus and branch input control module, realize that bus or the insulation of a certain branch positive or negative pole were both reduced and connect
The process on ground are as follows:
S50: host computer issues fault simulation order, and fault simulation unit reduces failure according to the order setting insulation issued
The bus or branch number of simulation test；
S51: after the CPU of fault simulation unit receives host computer order, according to bus or branch number, first relay
K2, K3 or K5, K6 or K4, K7 are connected；
After S52: relay K2, K3 or K5, K6 or K4, K7 connect 2s, fault simulation unit is determined according to the order issued
Positive bus-bar, a certain grounding or negative busbar, a certain grounding determine that K9 or K22 relay is connected；
After S53:K9 or K22 relay is connected, bus or branch insulation reduction and ground fault simulation start, until failure
Simulated time arrives, and fault simulation is automatically stopped.
As shown in figure 5, it includes that relay, several groups are concatenated that the bus and branch insulation, which reduce and are grounded control module,
Ground resistance unit and protective resistance, protective resistance and each relay normally open contact in parallel of every group of ground resistance unit, it is aforementioned
Each relay coil is connected with main control chip, and the resistance value of each ground resistance unit is different, and 8 groups of ground resistance lists are generally arranged
Member, resistance value are respectively 1K Ω, 2K Ω, 4K Ω, 8K Ω, 16K Ω, 32K Ω, 64K Ω and 128K Ω, are controlled by relay each
The switching state of ground resistance unit, to realize DC power system, resistance step value is 1K over the ground, resistance over the ground
1K-512K is set, and the purpose that protective resistance is arranged is to prevent bus or the positive and negative the two poles of the earth of branch while being grounded, and prevents short circuit.Such as figure
Shown in 5, resistance R53, R54 series connection, after resistance R67, R68 series connection, then it is in parallel, realize resistance value 1K Ω；Resistance R55, R56 series connection,
After resistance R69, R70 series connection, then it is in parallel, realize resistance value 2K Ω；Resistance R57, R58 series connection, after resistance R71, R72 series connection, then simultaneously
Connection realizes resistance value 4K Ω；Resistance R59, R60 series connection, after resistance R73, R74 series connection, then it is in parallel, realize resistance value 8K Ω；Resistance
R61, R62 series connection, after resistance R75, R76 series connection, then it is in parallel, realize resistance value 16K Ω；Resistance R63, R64 series connection, resistance R77,
After R78 series connection, then it is in parallel, realize resistance value 32K Ω；Resistance R117, R118 series connection, after resistance R123, R124 series connection, then it is in parallel,
Realize resistance value 64K Ω；Resistance R119, R120 series connection, after resistance R125, R126 series connection, then it is in parallel, realize 128K Ω；Protection electricity
Resistance includes concatenated resistance R121, R122.
The process of control module bus and the simulation of grounding Resistance Fault is reduced and is grounded by bus or branch insulation
Are as follows:
S10: host computer setting starts resistance eutral grounding fault simulation and tests initial value；
S11: setting stops resistance eutral grounding fault simulation and tests initial value；
S12: the whether enabled positive electrode resistance of setting tests initial value；
S13: setting positive electrode resistance resistance value, the setting of positive electrode resistance resistance value need to be less than or equal to 512K；
S14: the whether enabled cathode resistance test initial value of setting；
S15: setting cathode resistance, the setting of cathode resistance need to be less than or equal to 512K；
S16: setting ground resistance fault simulation testing time, fault simulation time are more than or equal to setting ground resistance failure
When the simulation test time, ground resistance fault simulation is automatically stopped；
S17: the bus or branch number that setting ground resistance fault simulation is tested, analogue ground Resistance Fault are modeled as mother
The number of line or a certain branch；
S18: host computer transmitting order to lower levels starts bus or branch insulation reduces and ground fault simulation, and bus or branch are exhausted
Edge reduces and ground fault simulation starts, and arrives until the fault simulation time, fault simulation is automatically stopped.
It should be noted that cathode resistance described in positive electrode resistance resistance value and S15 described in S13 cannot be arranged simultaneously
Less than 10K.
As shown in figure 4, it includes relay K36, relay K38, relay K39, each relay that control module is scurried into exchange
Coil one end passes through photoelectric isolation module and is connected to main control chip output end, and the access of relay K38 normally opened contact exchanges firewire,
The first normally opened contact of relay K36 and relay K39 is respectively connected to direct current positive bus input terminal and direct current negative busbar input terminal,
The relay K36 coil other end is connected to DC power supply by the second normally-closed contact of relay K39, and relay K39 coil is another
One end is connected to DC power supply by the second normally-closed contact of relay K36.
Control module is scurried by exchange, the process of fault simulation is scurried into the exchange of realization bus and branch are as follows:
S20: host computer setting starts exchange and scurries into fault simulation test initial value；
S21: setting stops exchange and scurries into simulation test initial value；
S22: polarity initial value is scurried into setting exchange, including anode is scurried into exchange, cathode is scurried into exchange；
S23: setting exchange is scurried into the fault simulation testing time, and the fault simulation time is more than or equal to setting exchange and scurries into failure
When the simulation test time, exchange is scurried into fault simulation and is automatically stopped；
S24: the branch number of fault simulation test is scurried into setting exchange, and analog AC scurries into a certain branch of fault simulation
Number；
S25: fault simulation is scurried into host computer transmitting order to lower levels, starting exchange, and exchange is scurried into fault simulation and started, until failure
Simulated time arrives, and fault simulation is automatically stopped.
As shown in fig. 6, it includes relay and current-limiting resistance that direct current, which mutually alters control module, I section of positive bus-bar passes through current-limiting resistance
And relay K31 a pair of contact is respectively connected to a pair of contact of II section of negative busbar and relay K30, relay K30's
A pair of contact is connected with I section of negative busbar, and I section of negative busbar is connected to be distinguished by current-limiting resistance and relay K32 a pair of contact
It is connected to a pair of contact of II section of positive bus-bar and relay K29, a pair of contact of relay K29 is connected with I section of positive bus-bar,
Coil one end of relay K29-K32 is connected with main control chip output end, and circuit interlock, relay is arranged in relay K29, K31
Circuit interlock is arranged in device K30, K32.
Control module is mutually altered by direct current, realizes that the direct current of bus and branch mutually alters the process of fault simulation are as follows:
S30: host computer setting starts direct current and mutually alters fault simulation test initial value；
S31: setting stops direct current and mutually alters simulation test initial value；
S32: setting direct current mutually alters type, including I sections of bus anodes and II sections of bus anodes, I sections of bus cathode and II sections
Bus cathode, I sections of bus anodes and II sections of bus anodes and I sections of bus cathode and II sections of bus cathode, II sections of bus anodes and I
Section bus cathode, II sections of bus cathode and I sections of bus anodes, II sections of bus anodes and I sections of bus cathode and II sections of bus cathode
With I sections of buses；
S33: setting direct current is mutually altered the fault simulation testing time, and the fault simulation time is more than or equal to setting direct current and mutually alters failure
Simulation is surveyed
When trying the time, direct current is mutually altered fault simulation and is automatically stopped；
S34: setting direct current mutually alters the branch number of fault simulation test, and analog DC mutually alters a certain branch of fault simulation
Number；
S35: host computer transmitting order to lower levels, starting direct current mutually alter fault simulation, and direct current is mutually altered fault simulation and started, until failure
Simulated time arrives, and fault simulation is automatically stopped.
As shown in fig. 7, main control chip increases relay K37 and relay the K40 difference of module by distribution capacity over the ground
It realizes the on-off between positive and negative bus and direct-to-ground capacitance terminal J9, J14, and then realizes the switching of direct-to-ground capacitance.
By distribution capacity over the ground increase module, realize bus over the ground distribution capacity increase fault simulation process are as follows:
S40: host computer is arranged bus distributed capacitance and increases fault simulation test initial value；
S41: setting stops bus distributed capacitance and increases fault simulation test initial value；
S42: setting bus distributed capacitance increases type, including positive bus-bar direct-to-ground capacitance increases, negative busbar direct-to-ground capacitance increases
Greatly；
S43: setting bus distributed capacitance increases the fault simulation testing time, and the fault simulation time is more than or equal to setting bus
When distribution capacity increases the fault simulation testing time, bus distributed capacitance increases fault simulation and is automatically stopped；
S44: host computer transmitting order to lower levels, starting bus distributed capacitance increase fault simulation, and bus distributed capacitance increases failure
Simulation starts, and arrives until the fault simulation time, fault simulation is automatically stopped.
The present invention is in use, be connected to bus and branch input control module for I sections of buses of DC power system or branch
Corresponding connection terminal, bus or tributary signal are connected by bus and branch input control module by voltage acquisition module
To main control chip, and then acquire bus or branch voltage, bus or the positive voltage-to-ground of branch, bus or the negative voltage-to-ground of branch；
I sections of buses of DC power system or branch are connected to bus connection terminal corresponding with branch input control module, bus or
Tributary signal is reduced and is grounded control module and optocoupler by bus and branch insulation by bus and branch input control module
Isolation module realizes bus and the simulation of grounding Resistance Fault；By I sections of buses of DC power system, two branches or three branch
Road is connected to the connection terminal of equipment, bus or tributary signal by bus and branch input control module, by DC power supply system
The II section bus of system is connected to the connection terminal of equipment, mutually alters control module by direct current, realizes that the direct current of bus and branch is mutual
Alter fault simulation；By I sections of buses of DC power system, two branches or three branches, it is connected to the connection terminal of equipment, bus
Or tributary signal scurries into control module by exchange, realizes the friendship of bus and branch by bus and branch input control module
Flee into fault simulation；I sections of buses of DC power system are connected to equipment connection terminal, bus is inputted by bus and branch
Control module increases module by distribution capacity over the ground, realizes that distribution capacity increases fault simulation to bus over the ground；Communication module is used
Communication between realization equipment and host computer.
Claims (9)
1. a kind of insulating ground fault simulation unit, which is characterized in that including main control chip, voltage acquisition module, communication module,
Bus reduces and is grounded control module with branch input control module, bus with branch insulation, exchanges and scurry into control module, direct current
Mutually alter that control module, distribution capacity increases module over the ground, the voltage acquisition module and communication module be connected to main control chip,
Bus and branch insulation are connected in the bus and the control of branch input control module reduces and is grounded control module, the bus with
Branch insulation reduces and ground connection control module, exchange scurry into control module and direct current and mutually alter control module and pass through light-coupled isolation module
It is connected to main control chip, bus and branch insulation are connected in bus and the control of branch input control module reduces and be grounded control mould
Block.
2. insulating ground fault simulation unit according to claim 1, which is characterized in that the voltage acquisition module is successively
Main control chip is connected to by AD conversion module and digital isolation module.
3. insulating ground fault simulation unit according to claim 2, which is characterized in that the voltage acquisition module includes
Balanced bridge circuit, voltage follower circuit and operational amplification circuit, bus and branch voltage, bus and the positive voltage-to-ground of branch, mother
Line and the negative voltage-to-ground of branch pass through after balanced bridge circuit is divided respectively using voltage follower circuit and operation amplifier electricity
Road output signal is connected to AD conversion module.
4. insulating ground fault simulation unit according to claim 1, which is characterized in that the bus and branch input are controlled
Molding block includes bus input port and branch input mouth, and the positive and negative anodes of bus input port and branch input mouth lead to respectively
It crosses relay and is connected to positive and negative electrode bus, positive and negative electrode bus passes through relay respectively and is connected to DC power supply.
5. insulating ground fault simulation unit according to claim 1, which is characterized in that it further include display module, display
Module is connected with main control chip.
6. insulating ground fault simulation unit according to claim 1, which is characterized in that the bus and branch insulation drop
Low and ground connection control module includes relay, the concatenated ground resistance unit of several groups and protective resistance, protective resistance and every group
Each relay normally open contact in parallel of ground resistance unit, aforementioned each relay coil are connected with main control chip.
7. insulating ground fault simulation unit according to claim 1, which is characterized in that control module is scurried into the exchange
Including relay K36, relay K38, relay K39, each relay coil one end passes through photoelectric isolation module and is connected to master
Control chip output, relay K38 normally opened contact access exchange firewire, the first normally opened contact of relay K36 and relay K39
It is respectively connected to direct current positive bus input terminal and direct current negative busbar input terminal, the relay K36 coil other end passes through relay K39's
Second normally-closed contact is connected to DC power supply, and the relay K39 coil other end is connected by the second normally-closed contact of relay K36
To DC power supply.
8. insulating ground fault simulation unit according to claim 1, which is characterized in that the direct current mutually alters control module
Including relay and current-limiting resistance, I section of positive bus-bar is respectively connected to II section by current-limiting resistance and relay K31 a pair of contact
A pair of contact of negative busbar and relay K30, a pair of contact of relay K30 are connected with I section of negative busbar, I section of negative busbar
Connected first pair that II section of positive bus-bar and relay K29 are respectively connected to by current-limiting resistance and relay K32 a pair of contact
Contact, a pair of contact of relay K29 are connected with I section of positive bus-bar, and coil one end of relay K29-K32 is and main control chip
Output end is connected, and circuit interlock is arranged in relay K29, K31, and circuit interlock is arranged in relay K30, K32.
9. insulating ground fault simulation unit according to claim 1, which is characterized in that the distribution capacity over the ground increases
Module controls relay by main control chip and realizes the on-off between positive and negative bus and direct-to-ground capacitance terminal, and direct-to-ground capacitance terminal connects
Connect direct-to-ground capacitance.
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