CN110474302A - A kind of mesolow DC distribution net bus protection relay system and method - Google Patents
A kind of mesolow DC distribution net bus protection relay system and method Download PDFInfo
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- CN110474302A CN110474302A CN201810446315.7A CN201810446315A CN110474302A CN 110474302 A CN110474302 A CN 110474302A CN 201810446315 A CN201810446315 A CN 201810446315A CN 110474302 A CN110474302 A CN 110474302A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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Abstract
The present invention discloses a kind of mesolow DC distribution net bus protection relay system and method, and in system, the first DC current transformer is configured in DC bus inlet wire dc switch side；Second DC current transformer configures near DC bus, and inlet wire forward direction passes through, and one or more outlets pass back through；The inlet wire tripping output signal of DC bus protective device is connected with incoming switch separating brake input terminal, and outlet tripping output signal is connected with each outlet switch separating brake input terminal.Such technical solution may be implemented in direct-flow distribution system quick detection, positioning and isolation when bus-bar fault occurs, it can be positioned and be isolated when bus-bar fault just occurs not yet to arrive stable state, and the communication between adjacent area is not needed, also it is not required to the electric current of every route on acquisition DC bus, reduce the cost in configuration, the processing operational capability of system is required to be relatively low, the global reliability and rapidity of direct-flow distribution system can be improved.
Description
Technical field
The invention belongs to electric system DC distribution technical fields, in particular to one kind is in 20kV and following mesolow direct current
The bus protection relay system of distribution network system and guard method.
Background technique
It is traditional with the increasingly raising of the increase of domestic city electricity needs and distributed generation resource and DC load accounting
AC distribution net is increasingly difficult to meet economy access distributed generation resource and DC load, further increase radius of electricity supply, increasing
Add the demands such as power supply capacity.At the same time, controllability is good, renewable energy access is convenient, transmission of electricity matter because having for DC distribution net
The advantages that amount is high, radius of electricity supply and delivering power are big becomes the hot spot of academia's research in recent years.
The characteristics of direct-flow distribution system is very different with AC system, and failure has its own, when direct current system especially
When ground connection or intereelectrode short-circuit failure occur for bus, fault current is risen rapidly, and can make in a short period of time to system equipment
At serious damage, this requires direct current protecting preferably to detect failure in Microsecond grade, and fast implements the positioning and isolation of failure.Mesh
The scheme of preceding DC distribution net bus protection has also in theoretical research stage, common guard method:
(1) harmonics scheme is copied, the magnitude of current of each route on DC bus-bar voltage amount and bus is acquired, uses routine
Overcurrent, mistake/low-voltage, the protection schemes such as differential.
(2) subway direct current protecting scheme is copied, is protected using current changing rate, as patent CN201210357913.X is disclosed
A kind of current changing rate method suitable for urban track traffic.
(3) patent CN201710070114.7, which is disclosed, carries out region stroke to DC distribution net using dc circuit breaker and bus
Point, judge each area fault current direction, then carries out information exchange, it is final to determine fault type and cut off failure.
(4) patent CN200810234059.1 is disclosed detects in conjunction with DC bus-bar voltage, judges that DC current increases simultaneously
Whether DC bus-bar voltage declines, to distinguish fault and disturbance or noise.
The above method has some limitations:
The magnitude of current of device acquisition busbar voltage amount and a plurality of route is claimed in method (1), due to direct fault current
It rises rapidly and requires the characteristics of Microsecond grade detects failure and millisecond even Microsecond grade excision failure, it is desirable that protective device can be
The processing analysis of multiple voltage and current signals is completed in the shorter time, this proposes very high want to device processing capacity
It asks.But conventional harmonics actuation time, fault current generally also reached steady when cutting off failure generally in 10ms or more at present
Definite value, and DC Line Fault wishes to cut off when failure just occurs not arrive stable state, therefore conventional harmonics scheme is less
Quick protection suitable for direct current.In addition, since protective device can only generally acquire the electric current and voltage of secondary side, a plurality of route
The acquisition of the magnitude of current certainly will require to configure multiple current transformers, since direct fault current rising is rapidly and very big, it is desirable that each
The mutual inductor response time is exceedingly fast and measurement range is very wide, on the one hand the configuration of more mutual inductors increases O&M cost, another party
The false protection or tripping risk that face is inconsistent there is also each mutual inductor response time and dynamic range and may cause.
Method (2) can be found failure when fault current is not up to stationary value, be suitable for fast detecting failure electric current
Line construction is simple, the differential apparent method of operation, since this method does not have selectivity, for it is complicated mostly into having more it is low
Straightening stream distribution bus is difficult to be accurately positioned fault point in area or outside area.
Method (3) requires to acquire the fault current in each region, judges that direction is gone forward side by side row information interaction, theoretically can be right
Failure is positioned and is isolated, but has also indicated that current direction variation in millisecond rank, is needed based on communication in text, can only be in phase
Neighbouring region carries out.
Method (4) can effectively exclude noise and interference signal, but to DC current protection philosophy and how not distinguish
It is discussed further in other bus area with external area error.
Summary of the invention
The purpose of the present invention is to provide a kind of mesolow DC distribution net bus protection relay system and method, can realize
Quick detection, positioning and the isolation when bus-bar fault occur in direct-flow distribution system, can just occur not yet to arrive in bus-bar fault
It can be positioned and be isolated when stable state, and not need the communication between adjacent area, also be not required to every line on acquisition DC bus
The electric current on road reduces the cost in configuration, requires to be relatively low to the processing operational capability of system, DC distribution can be improved
The global reliability and rapidity of system.
In order to achieve the above objectives, solution of the invention is:
A kind of mesolow DC distribution net bus protection relay system, including the first DC current transformer, the second DC current
Mutual inductor, DC bus protective device, incoming switch and outlet switch, wherein the first DC current transformer is configured in direct current
The dc switch side of bus inlet wire, the output signal of DC current transformer access DC bus protective device, and protective device is surveyed
Measure inlet wire current；Second DC current transformer is punching mutual inductor, is configured near DC bus, inlet wire forward direction is worn
The second DC current transformer is crossed, one or more outlets pass back through the second DC current transformer, and the second DC current is mutual
The output signal of sensor accesses DC bus protective device, and DC bus protector measuring obtains poor stream；DC bus protection
The inlet wire tripping output signal of device is connected with incoming switch separating brake input terminal, outlet tripping output signal and each outlet switch point
Lock input terminal is connected.
The above-mentioned first DC current transformer current sensor wide using measurement range, the second DC current transformer are adopted
With the current sensor of high response speed.
The center of above-mentioned second DC current transformer is equipped with multiple string holes in the arrangement of positive equilateral, string holes direction and the
Two DC current transformer planes are in plumbness, inlet wire and outlet and pass through from the string holes of the second DC current transformer,
Cable one small section of holding and second DC current transformer plane before and after passing through the second DC current transformer is vertical.
Above-mentioned DC bus protective device include acquisition module, data processing module, man-machine input module, display module and
Output module, wherein acquisition module includes the first mutual inductor data acquisition module and the second mutual inductor data acquisition module, acquisition
Module receives the output signal of the first, second DC current transformer, then exports data to data processing module；At data
Reason module includes that protection processing module and man-machine interface processing module, data processing module also receive man-machine input module simultaneously
Data, data through man-machine interface processing module and protection processing module processing after need to data to be shown be transferred to display mould
Block, while the signal exported will be needed to be transferred to output module.
A kind of mesolow DC distribution net bus bar protecting method, includes the following steps:
Step 1, the first DC current transformer is installed in the dc switch side of DC bus inlet wire, the first DC current is mutual
Sensor output signal accesses DC bus protective device, and DC bus protector measuring obtains inlet wire current；
Step 2, second DC current transformer of punching is installed near DC bus, inlet wire forward direction is made to pass through the
Two DC current transformers, one or more outlets pass back through the second DC current transformer, the second DC current transformer
Output signal accesses DC bus protective device, and DC bus protector measuring obtains poor stream；
Step 3, DC bus protective device is according to the first, second DC current transformer output signal of access, in real time
Mutual inductor output signal is detected, when detecting that the second DC current transformer signal intensity is more than threshold value, main protection movement,
Tripping is connected all into and out of wiretap with bus；When detecting that the first DC current transformer signal is more than threshold value, after
Standby protection act, tripping incoming switch.
In above-mentioned steps 3, main protection is protected using current changing rate, is equipped with main protection change rate startup threshold value, main guarantor
Protect overcurrent threshold value 1 and main protection overcurrent threshold value 2；When meeting following any one main protection operation condition, main protection
Movement:
First, detect that the current changing rate of the second DC current transformer output signal is greater than main protection curent change
After rate startup threshold value, protective device enters readiness, detects that the second DC current transformer output signal current value is big
After main protection overcurrent threshold value 1, main protection movement；
Article 2 detects that the second DC current transformer output signal current value is greater than k times of main protection overcurrent door
After limit value 2, protective device enters readiness, detects that the second DC current transformer output signal current value is greater than main protection
After overcurrent threshold value 2, main protection movement, wherein k is constant, value range 0.8~1.0.
In above-mentioned steps 3, DC bus protective device back-up protection uses overcurrent protection, is equipped with back-up protection change rate
Startup threshold value, back-up protection overcurrent threshold value 1, back-up protection overcurrent threshold value 2, time gate limit value 1 and time threshold
Value 2；When meeting following any one back-up protection operation condition, back-up protection movement:
First, detect that the current changing rate of the first DC current transformer output signal becomes greater than back-up protection electric current
After rate startup threshold value, protective device enters readiness, detects the first DC current transformer output signal current value
After back-up protection overcurrent threshold value 1, acted through 1 back-up protection of delay time threshold value；
Article 2 detects that the first DC current transformer output signal current value is greater than k times of back-up protection overcurrent
After threshold value 2, protective device enters readiness, detects that the first DC current transformer output signal current value was greater than electricity
After flowing threshold value 2, acted through 2 back-up protection of delay time threshold value, wherein k is constant, value range 0.8~1.0.
In above-mentioned steps 3, DC bus protective device divides the processing of interrupt progress data.
Solid-state relay is used when above-mentioned DC bus protective device acts.
After adopting the above scheme, what the present invention was obtained due to the second DC current transformer is the electricity for flowing in and out bus
Stream difference stream, the external area error time difference flow very little, the troubles inside the sample space time difference stream it is very big, therefore protective device may be implemented fault location and
Isolation, and the communication between adjacent area is not needed, it is also not required to the electric current of every route on acquisition DC bus, reduces configuration
On cost, the processing operational capability of device is required to be relatively low, the entirety of direct-flow distribution system bus protection can be improved
Reliability and rapidity.
Detailed description of the invention
Fig. 1 is bus of the embodiment of the present invention, entry/exit line, direct current instrument transformer and switch wire connection schematic diagram；
Fig. 2 is the arrangement schematic diagram of cable of the embodiment of the present invention and DC current transformer 2；
Fig. 3 is DC bus protective device structural schematic diagram of the embodiment of the present invention；
Electric current and current changing rate change over time curve synoptic diagram when Fig. 4 is failure of the embodiment of the present invention；
Fig. 5 is main protection of the embodiment of the present invention and back-up protection action logic schematic diagram.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention and beneficial effect are described in detail.
As shown in Figure 1, the present invention provides a kind of mesolow DC distribution net bus protection relay system, including DC current mutual inductance
Device 1, DC current transformer 2, DC bus protective device, incoming switch and outlet switch, are introduced separately below.
The configuration of DC current transformer 1 is believed in the dc switch side of DC bus inlet wire, the output of DC current transformer 1
Number access DC bus protective device (hereinafter referred to as protective device), protector measuring obtains inlet wire current；
The signal that DC current transformer 1 acquires makees back-up protection for busbar protective device, prevents outside the area Nei Huo, area
In the case of failure is cut off not in time, protective device can also according to the signal that DC current transformer 1 provides come tripping inlet wire, so as to
Prevent fault spread.If cutting off failure not in time when DC line or bus break down, fault current is often very big, and
The signal that DC current transformer 1 acquires is used as back-up protection, and fault current has generally approached when back-up protection will act
In a biggish steady-state value, DC current transformer 1 is saturated in high current in order to prevent, the DC current transformer 1
Using the wide current sensor of measurement range, such as use the open loop Hall current sensor of wide scope.
DC current transformer 2 is punching mutual inductor, is configured near DC bus, and inlet wire forward direction passes through mutual inductor,
One or more outlets pass back through mutual inductor, and the output signal of DC current transformer 2 accesses protective device, and protective device is surveyed
Measure difference stream；
In order to facilitate the installation of, the acquisition precision that out-of-balance current influences, improves difference stream is reduced, DC current transformer 2
There are the multiple string holes arranged in positive equilateral at center, cooperates shown in Fig. 2, and string holes direction and mutual inductor plane are in plumbness,
Inlet wire and outlet are passed through from the string holes of mutual inductor, and cable keeps one small section before and after passing through mutual inductor and hangs down with mutual inductor plane
Directly.Since cable is the string holes across mutual inductor center, the program can make each cable will not be because of mutual when by mutual inductor
It is in contact and influences insulation distance and dissipate temperature；
When DC bus operates normally or bus external area error occurs, the electric current of DC bus is flowed in and out theoretically
Be it is identical, this time difference stream essentially 0, what is obtained due to DC current transformer 2 is the difference for flowing in and out the electric current of bus
The electric current that DC current transformer 2 detects when stream, i.e. DC bus operate normally or external area error occurs is almost 0.When straight
Flow bus occur troubles inside the sample space when, flow in and out DC bus electric current will there were significant differences, can have larger difference at this time
Stream, DC current transformer 2 will test apparent curent change, when being broken down due to DC bus electric current rise rapidly and
Often failure is serious, in order to guarantee that busbar protective device can be quickly detected fault current and tripping switch, DC current mutual inductance
2 response speed of device must be quickly.To guarantee that 2 response time of DC current transformer is fast and high sensitivity, the DC current
Mutual inductor 2 need to use the current sensor of high response speed, and such as highly sensitive giant magnetoresistance current sensor or high bandwidth are closed
Ring Hall current sensor etc..
The inlet wire tripping output signal of DC bus protective device is connected with incoming switch separating brake input terminal, and outlet tripping is defeated
Signal is connected with each outlet switch separating brake input terminal out.
As shown in figure 3, DC bus protective device includes acquisition module, data processing module, man-machine input module, display
Module and output module, wherein acquisition module includes 2 data acquisition module of 1 data acquisition module of mutual inductor and mutual inductor；Data
Processing module includes protection processing module and man-machine interface processing module；Output module includes protection act output module and other
Signal output module；When work, it (includes DC current transformer 1 and DC current mutual inductance that acquisition module, which receives external mutual inductor,
Device 2) output signal, then data are exported to data processing module, data processing module also receives man-machine input mould simultaneously
The data of block, data through man-machine interface processing module and protection processing module processing after need to data to be shown be transferred to display
Module, while the signal exported will be needed to be transferred to output module.
The present invention also provides a kind of mesolow DC distribution net bus bar protecting methods, include the following steps:
Step 1, in the dc switch side configuring direct current current transformer 1 of DC bus inlet wire, the DC current mutual inductance
The output signal of device 1 accesses protective device, and protector measuring obtains inlet wire current.
Cooperate shown in Fig. 1, the configuring direct current current transformer 1 on the upside of direct current incoming switch, when installation, inlet wire is installed as far as possible
In the center of mutual inductor 1, and cable and 1 plane of mutual inductor are in vertical position, at the same mutual inductor 1 using measurement range compared with
Wide current sensor such as uses the open loop Hall current sensor of wide scope, for acquiring inlet wire current.
Step 2, by be connected with bus it is all into and out of line by inlet wire flow into, outlet elution order be well placed, direct current mother
Line nearby installs a punching DC current transformer 2；
Specifically, cooperate shown in Fig. 2, a punching DC current transformer 2 is installed near DC bus, for straight
Flow Line, general every inlet wire or outlet include anode and cathode both threads, and when detecting electric current, the present embodiment only detects anode
The electric current of route.The electrode line cable forward direction of inlet wire is set to pass through mutual inductor by the mark on mutual inductor, one or more outlets
Electrode line cable passes back through mutual inductor, and 2 output signal of DC current transformer accesses protective device, and protector measuring obtains
Difference stream.DC current transformer 2 using high response speed current sensor, such as highly sensitive giant magnetoresistance current sensor or
The closed-loop Hall current sensor etc. of high bandwidth.When installation, it should be noted that insulation distance and heat dissipation between inlet wire, outlet, and
It is installed on the center of mutual inductor as far as possible into and out of line, and all cables are in mutual inductor plane when passing through mutual inductor and hang down
Straight state.
Step 3, by the output signal of DC current transformer 1 and DC current transformer 2 access DC bus protection dress
It sets；
Specifically, the primary side DC current in inlet wire and outlet, through DC current transformer 1 and DC current transformer
2 output devices are transformed to receivable secondary side signal, signals of these outputs be lesser DC voltage or DC current or
The output signal of digital signal, DC current transformer 1 and DC current transformer 2 accesses DC bus protective device, direct current
There is corresponding acquisition module to receive the signal on busbar protective device, data is handled inside subsequent protective device, simultaneously
The tripping output signal of DC bus protective device is connected with incoming switch and outlet switch tripping input terminal, keeps protective device dynamic
When making, it can be switched accordingly with tripping.Cooperate Fig. 3 shown in, DC bus protective device by acquisition module, data processing module,
Man-machine input module, display module and output module composition, wherein mutual inductor output signal is that DC voltage or DC current are believed
Number, direct current signal is after the A/D conversion inside protective device, and into data processing module link, data processing module connects simultaneously
The instruction of man-machine input module input, such as fixed value adjusting, screen switching, printing are received, after data processing module has handled data,
Result is transmitted to output module and display module.
Step 4, DC current transformer 1 of the DC bus protective device according to access, 2 output signals, real-time detection are mutual
Sensor output signal, when detecting that 2 signal intensity of mutual inductor is more than threshold value, protective device movement, tripping is connected with bus
It is all into and out of wiretap；When detecting that 1 signal of mutual inductor is more than threshold value, busbar protective device movement, tripping inlet wire is opened
It closes.
DC bus protective device has main protection and back-up protection, and the signal that DC current transformer 2 acquires is for bus
Protective device is used as main protection, after main protection movement, tripping incoming switch, outlet switch；What DC current transformer 1 acquired
Signal makees back-up protection for busbar protective device, after back-up protection movement, tripping incoming switch.
Specifically, main protection refers to that DC bus protective device detects that 2 signal intensity of DC current transformer meets in advance
When the operation condition first set, then DC bus protective device movement (main protection movement), tripping is connected all with bus
Into and out of wiretap；Back-up protection is that DC bus protective device detects that 1 signal intensity of DC current transformer satisfaction is set in advance
When the operation condition set, then DC bus protective device movement (back-up protection movement), tripping incoming switch.Back-up protection is anti-
In the area Zhi or in the case of external area error cuts off not in time, protective device can also according to the signal that mutual inductor 1 provides come tripping into
Line, to prevent fault spread.
For protective device after entering readiness, device starts startup separator recording, since DC bus protective device is real
When detect mutual inductor output signal, and need can complete in a very short period of time each signal processing analysis, to guarantee that direct current is matched
Each calculating interrupt processing time of the global reliability and rapidity of electric system bus protection, DC bus protective device needs very
It is short, but in view of mesolow DC distribution net is in the popularity applied from now on and to the sensibility of cost, to reduce calculation process
And resource consumption, the processing that the DC bus protective device divides interrupt to carry out data, wherein protection processing module is adopted
Sample break period representative value takes 0.01ms, 0.02ms, 0.05ms or 0.1ms, and the processing calculating of main protection and back-up protection exists
Protect Sampling interrupt in complete, guarantee it is fast and reliable, the interrupt processing time representative value of man-machine interface processing module take 5ms,
10ms or 20ms.In Fig. 3, data processing module is provided with two break periods, and a break period is 0.02ms, is used for main guarantor
Data and relay protective scheme etc. needed for shield and back-up protection are handled, another break period is 10ms, for showing, message etc.
Man-machine interface processing.
If DC line or bus cut off failure not in time when breaking down, fault current is often very big, and direct current
The signal that current transformer 1 acquires is as back-up protection use, and fault current has generally leveled off to one when back-up protection will act
Biggish steady-state value, DC current transformer 1 is saturated in high current in order to prevent, and the DC current transformer 1 is using survey
The wide current sensor of range is measured, such as uses the open loop Hall current sensor of wide scope.
In order to which in quick and reliable detection zone and external area error, the main protection of the DC bus protective device is using electricity
Rate of change protection is flowed, includes main protection change rate startup threshold value, main protection overcurrent threshold value 1, main protection overcurrent thresholding
Value 2, wherein there are two main protection operation conditions, any one movement of main protection when meeting:
(1) detect that the current changing rate of 2 output signal of DC current transformer starts greater than main protection current changing rate
After threshold value, protective device enters readiness, detects that 2 output signal current value of DC current transformer is greater than main protection
After current threshold 1, main protection movement；
(2) detect 2 output signal current value of DC current transformer be greater than k (k is constant, value range 0.8~1.0,
After k takes main protection overcurrent threshold value 2 0.95) again in Fig. 4, protective device enters readiness, detects that DC current is mutual
After 2 output signal current value of sensor is greater than main protection overcurrent threshold value 2, main protection is acted, tripping inlet wire and outlet switch.
DC bus protective device back-up protection use overcurrent protection, comprising back-up protection change rate startup threshold value,
Back-up protection overcurrent threshold value 1, back-up protection overcurrent threshold value 2, time gate limit value 1, time gate limit value 2, back-up protection
Operation condition also there are two, any one movement of back-up protection when meeting:
(1) detect that the current changing rate of 1 output signal of DC current transformer is greater than back-up protection current changing rate and opens
After dynamic threshold value, protective device enters readiness, detects that 1 output signal current value of DC current transformer is protected greater than standby
After protecting overcurrent threshold value 1, be delayed back-up protection movement, tripping incoming switch (as 1 definite value of time gate limit value in Fig. 4)；
(2) detect 1 output signal current value of DC current transformer be greater than k (k is constant, value range 0.8~1.0,
After k takes back-up protection overcurrent threshold value 2 0.95) again in Fig. 5, protective device enters readiness, detects DC current
After 1 output signal current value of mutual inductor is greater than overcurrent threshold value 2, be delayed the standby (as 2 definite value of time gate limit value in Fig. 5)
Protection act, tripping incoming switch.
The electric current and electric current of 2 output signal of DC current transformer 1 or DC current transformer become when Fig. 4 lists failure
Rate changes over time curve synoptic diagram, and t1 is that the moment just takes place in failure in figure, and t2 is DC current transformer output letter
Number current changing rate be greater than change rate startup threshold value moment of corresponding main protection or back-up protection, t3 is DC current
The electric current of mutual inductor output signal is greater than 1 moment of overcurrent threshold value of corresponding main protection or back-up protection, and t4 is direct current
The electric current of current transformer output signal is greater than 2 moment of overcurrent threshold value of corresponding main protection or back-up protection, and t5 is
The electric current of DC current transformer output signal reaches the stable state moment when failure is not cut off.
In Fig. 5, I1 represents the electric current of 1 output signal of DC current transformer, and I2 represents the output letter of DC current transformer 2
Number electric current.For protective device after entering readiness, device starts startup separator recording, main, back-up protection in the present embodiment
In k take 0.95.
As shown in figure 5, listing current changing rate protection curve logical schematic, the wherein main protection at mutual inductor 1 is
After the current changing rate for detecting mutual inductor 1 is greater than 1 current-rising-rate startup threshold value of mutual inductor, protective device enters preparation
State, after detecting that 1 current value of mutual inductor is greater than 1 change rate electric current of mutual inductor movement threshold value, through 1 time threshold of mutual inductor
Protection act after value 1 is delayed, tripping incoming switch；Back-up protection at mutual inductor 1 is to work as to detect that 1 electric current of mutual inductor is greater than
When 0.95 times of 1 overcurrent threshold value of mutual inductor, protective device enters readiness, when current value is greater than 1 overcurrent of mutual inductor
Afterwards, protection act, tripping incoming switch after the delay of 1 time gate limit value 2 of mutual inductor.
Main protection at mutual inductor 2 is opened when the current changing rate for detecting mutual inductor 2 is greater than 2 current-rising-rate of mutual inductor
After dynamic threshold value, protective device enters readiness, when detecting that 2 current value of mutual inductor is greater than 2 change rate electric current of mutual inductor and moves
After making threshold value, since 2 time gate limit value of mutual inductor is 0, protection acts immediately, tripping inlet wire and outlet switch；Mutual inductance
Back-up protection at device 2 is the protection dress when detecting that 2 electric current of mutual inductor is greater than 0.95 times of 2 overcurrent threshold value of mutual inductor
It sets and enters readiness, after current value is greater than 2 overcurrent of collector, since 2 time gate limit value of mutual inductor is 0, protection
It acts immediately, tripping inlet wire and outlet switch.
Meanwhile in order to DC bus protective device in the event of a failure can quick protection exit, combine economy, directly
Flow busbar protective device output module in protection act output module output when use solid-state relay, typical case with IGBT after
Electric appliance, for quickly jumping into, outlet switch；The relay of non-tripping outlet such as alerts, is latched signal outlet using conventional electricity
Magnetic relay can also use solid-state relay if other relays are also high to rapidity requirement.In Fig. 2, DC bus protection dress
Set in protection act, IGBT output, for jumping into, outlet switch, in the signals output such as alarm, locking, using routine after
Electric appliance, for exporting other signals.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (9)
1. a kind of mesolow DC distribution net bus protection relay system, it is characterised in that: including the first DC current transformer, second
DC current transformer, DC bus protective device, incoming switch and outlet switch, wherein the first DC current transformer is matched
It sets in the dc switch side of DC bus inlet wire, the output signal of DC current transformer accesses DC bus protective device, protects
Protection unit measurement obtains inlet wire current；Second DC current transformer is punching mutual inductor, is configured near DC bus, into
Line forward direction passes through the second DC current transformer, and one or more outlets pass back through the second DC current transformer, and second is straight
The output signal of galvanic electricity current transformer accesses DC bus protective device, and DC bus protector measuring obtains poor stream；Direct current
Busbar protective device inlet wire tripping output signal be connected with incoming switch separating brake input terminal, outlet tripping output signal with respectively go out
Wiretap separating brake input terminal is connected.
2. a kind of mesolow DC distribution net bus protection relay system as described in claim 1, it is characterised in that: described first is straight
The galvanic electricity current transformer current sensor wide using measurement range, the second DC current transformer use the electric current of high response speed
Sensor.
3. a kind of mesolow DC distribution net bus protection relay system as described in claim 1, it is characterised in that: described second is straight
The center of galvanic electricity current transformer is equipped with multiple string holes in the arrangement of positive equilateral, and string holes direction and the second DC current transformer are flat
Face is in plumbness, inlet wire and outlet and passes through from the string holes of the second DC current transformer, and cable is passing through the second direct current
One small section of holding and the second DC current transformer plane are vertical before and after current transformer.
4. a kind of mesolow DC distribution net bus protection relay system as described in claim 1, it is characterised in that: the direct current is female
Line protective device includes acquisition module, data processing module, man-machine input module, display module and output module, wherein acquisition
Module includes the first mutual inductor data acquisition module and the second mutual inductor data acquisition module, and acquisition module receives first, second
The output signal of DC current transformer, then exports data to data processing module；Data processing module includes at protection
Module and man-machine interface processing module are managed, data processing module also receives the data of man-machine input module simultaneously, and data are through man-machine
After interface processing module and protection processing module processing need to data to be shown be transferred to display module, while will need to export
Signal be transferred to output module.
5. a kind of mesolow DC distribution net bus bar protecting method, it is characterised in that include the following steps:
Step 1, the first DC current transformer, the first DC current transformer are installed in the dc switch side of DC bus inlet wire
Output signal accesses DC bus protective device, and DC bus protector measuring obtains inlet wire current；
Step 2, second DC current transformer of punching is installed near DC bus, so that inlet wire forward direction is passed through second straight
Galvanic electricity current transformer, one or more outlets pass back through the second DC current transformer, the output of the second DC current transformer
Signal accesses DC bus protective device, and DC bus protector measuring obtains poor stream；
Step 3, first, second DC current transformer output signal of the DC bus protective device according to access, real-time detection
Mutual inductor output signal, when detecting that the second DC current transformer signal intensity is more than threshold value, main protection movement, tripping
What is be connected with bus is all into and out of wiretap；When detecting that the first DC current transformer signal is more than threshold value, standby is protected
Shield movement, tripping incoming switch.
6. a kind of mesolow DC distribution net bus bar protecting method as claimed in claim 5, it is characterised in that: the step 3
In, main protection is protected using current changing rate, is equipped with main protection change rate startup threshold value, 1 and of main protection overcurrent threshold value
Main protection overcurrent threshold value 2；When meeting following any one main protection operation condition, main protection movement:
First, detect that the current changing rate of the second DC current transformer output signal is greater than main protection current changing rate and opens
After dynamic threshold value, protective device enters readiness, detects that the second DC current transformer output signal current value is greater than master
After protecting overcurrent threshold value 1, main protection movement；
Article 2 detects that the second DC current transformer output signal current value is greater than k times of main protection overcurrent threshold value 2
Afterwards, protective device enters readiness, and it is excessively electric to detect that the second DC current transformer output signal current value is greater than main protection
After flowing threshold value 2, main protection movement, wherein k is constant, value range 0.8~1.0.
7. a kind of mesolow DC distribution net bus bar protecting method as claimed in claim 5, it is characterised in that: the step 3
In, DC bus protective device back-up protection uses overcurrent protection, is equipped with back-up protection change rate startup threshold value, standby is protected
Protect overcurrent threshold value 1, back-up protection overcurrent threshold value 2, time gate limit value 1 and time gate limit value 2；Meet following any one
When back-up protection operation condition, back-up protection movement:
First, detect that the current changing rate of the first DC current transformer output signal is greater than back-up protection current changing rate
After startup threshold value, protective device enters readiness, detects that the first DC current transformer output signal current value is greater than
After back-up protection overcurrent threshold value 1, acted through 1 back-up protection of delay time threshold value；
Article 2 detects that the first DC current transformer output signal current value is greater than k times of back-up protection overcurrent thresholding
After value 2, protective device enters readiness, detects that the first DC current transformer output signal current value is greater than overcurrent door
After limit value 2, acted through 2 back-up protection of delay time threshold value, wherein k is constant, value range 0.8~1.0.
8. a kind of mesolow DC distribution net bus bar protecting method as claimed in claim 5, it is characterised in that: the step 3
In, DC bus protective device divides the processing of interrupt progress data.
9. a kind of mesolow DC distribution net bus bar protecting method as claimed in claim 5, it is characterised in that: the direct current is female
Solid-state relay is used when line protective device acts.
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| CN201810446315.7A CN110474302A (en) | 2018-05-11 | 2018-05-11 | A kind of mesolow DC distribution net bus protection relay system and method |
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| CN201810446315.7A CN110474302A (en) | 2018-05-11 | 2018-05-11 | A kind of mesolow DC distribution net bus protection relay system and method |
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