CN208707386U - One kind being based on the self-powered long-range failure protection system of protective device - Google Patents

Abstract

The utility model relates to one kind to be based on the self-powered long-range failure protection system of protective device, including protective device, DC power supply current supply circuit, storage capacitor, CT, PT auxiliary power supply circuit, power supply control and switching circuit, breaker control circuit, monitoring system, fibre-optic current differential protection communication loop and DC power system.It is provided by the utility model a kind of based on the self-powered long-range failure protection system of protective device; pass through the setting in the self-powered long-range each circuit of failure protection system of protective device; by opposite side protective device by its this side breaker tripping; channel abnormal and protection power source power loss are distinguished, effectively preventing protective device can not tripping circuit breaker and bring further loss in time.

Description

One kind being based on the self-powered long-range failure protection system of protective device

Technical field

The present invention relates to power emergency service technique fields, self-powered based on protective device more particularly, to one kind Long-range failure protection system.

Background technique

Existing protective device is known as circuit-breaker failure portection equipment, refers to that electrical equipment breaks down, in relay protection Device action issues trip signal when breaker tripping, utilizes the protection act information of faulty equipment and the electricity of tripping breaker Stream information constitutes the differentiation to breaker failure, can cut off other related breakers in same plant stand with the shorter time limit, So that scope of power outage is limited in minimum, to guarantee the stable operation of entire power grid, avoid generator, transformer, switchgear, Accident is disintegrated in the collapse of the serious scaling loss and power grid of the fault elements such as cable.

In current electric system, after the station electricity consumption alternating current-direct current decompression of a certain substation occur primary system failure or Cause while primary system failure stand electricity consumption alternating current-direct current decompression the case where happen occasionally, when this primary system breaks down by It is lost working power in the protective device in our station, even if the protection scope for the protective device installed in our station occurs for failure Interior, protective device also can not correctly be acted Fault Isolation, be only capable of rely on our station power circuit opposite side protection act by failure every From this generally requires several seconds, Ji Shimiao, even the longer time could be by Fault Isolation, and it is serious that result will lead to primary equipment Damage, such as switchgear is burnt, cable duct is burnt, main transformer is on fire from explosion, repairs difficulty, and generally requiring the long period could It restores electricity, large area, for a long time power failure generation will be caused, seriously threaten electricity net safety stable and influence to Electricity customers service Quality.In face of this major hidden danger, mainly made up at present by the protection of face to certain area or locality protection, but current Technological means needs carry out information exchange in extensive region, while being also required to working power and could pass the information of abort situation Out, enforcement difficulty is big, it is not high to implement accuracy.

Important substation is in order to avoid this major hidden danger, often from raising substation's AC and DC working power system Reliability is started with, to prevent the generation of similar hidden danger, as using more set power supply backups, reinforcement AC and DC working power system Maintenance and management, but these measures only reduce the incidence of hidden danger to a certain extent, it in the event of a failure can not be timely Reply, and these measures considerably increase input cost.

Summary of the invention

The present invention is when primary system breaks down in the prior art more than solving since the protective device in our station loses Working power, can not the correct quick acting technological deficiency that causes further expansion to be lost Fault Isolation, offer is provided One kind being based on the self-powered long-range failure protection system of protective device.

To realize the above goal of the invention, the technical solution adopted is that:

One kind being based on the self-powered long-range failure protection system of protective device, including protective device, DC power supply are powered back Road, storage capacitor, CT, PT auxiliary power supply circuit, power supply control and switching circuit, breaker control circuit, monitoring system, optical fiber Current differential protection communication loop and DC power system；Wherein；

The DC power supply current supply circuit, storage capacitor, CT, PT auxiliary power supply circuit, breaker control circuit, power supply control System is electrically connected with the protective device with switching circuit, fibre-optic current differential protection communication loop, DC power system；

The protective device is connect with the monitoring-controlling system signal；

The protective device, DC power supply current supply circuit, storage capacitor, CT, PT auxiliary power supply circuit, with the power supply Control is electrically connected with switching circuit；

Protective device and opposite side protective device electrically connect in fibre-optic current differential protection communication loop this protection system It connects.

Wherein, the protective device include microprocessor, breakdown judge module, state acquisition and control module, it is first logical Believe module, second communication module, power module, voltage detection module and current detection module；Wherein:

The breakdown judge module, state acquisition and control module, first communication module, second communication module, power supply mould Block, voltage detection module, current detection module are electrically connected with the microprocessor respectively；

The voltage detection module and DC control and switching circuit are electrically connected；

The current detection module and DC control and switching circuit are electrically connected；

The breakdown judge module and DC control and switching circuit are electrically connected；

The state acquisition and control module and DC control and switching circuit, breaker control circuit and DC power supply system System is electrically connected；

The first communication module and fibre-optic current differential protection communication loop are electrically connected；

The second communication module is connect with monitoring-controlling system signal；

The power module and microprocessor, breakdown judge module, state acquisition and control module, first communication module, Second communication module, voltage detection module and current detection module electrical connection, provide working power；

The power module and DC power supply current supply circuit output end, storage capacitor output end, CT, PT auxiliary power supply circuit Output end electrical connection, receives power supply.

Wherein, the power supply control and switching circuit and DC power supply current supply circuit, storage capacitor, CT, PT auxiliary power supply Circuit electrical connection:

The power supply control is responsible for monitoring DC power supply current supply circuit, storage capacitor, CT, PT auxiliary power supply with switching circuit Output power value is answered in circuit output electric signal and control.

It is provided with power supply power supply control module on power supply control and switching circuit, by power supply power supply control module, DC power supply current supply circuit, storage capacitor, CT, PT auxiliary power supply circuit are controlled to protective device power supply output mode, and straight The mode that galvanic electricity source current supply circuit is preferentially powered using CT, PT jointly after exporting without electric signal, ratio of specifically powering are as follows:

In the case of non-faulting, is exported in DC power supply current supply circuit without electric signal while protective device experiences breaker When control loop and the equal power supply of DC power system disappear, as the every phase of substation bus bar PT and line side PT allow to protect using appearance When amount is all larger than equal to 17VA or more, is divided equally using bus three-phase PT and route PT and powered, three-phase CT, zero sequence CT and zero sequence electricity It pushes back the scheme that road does not power and provides power supply to protective device；

In the case of non-faulting, is exported in DC power supply current supply circuit without electric signal while protective device experiences breaker When control loop and the equal power supply of DC power system disappear, as the every phase of substation bus bar PT and line side PT allow to protect using appearance When amount is respectively less than 17VA, power supply control is with switching circuit using bus three-phase PT and route PT according to about needing power supply capacity equal proportion Power supply, insufficient section powered by storage capacitor, and the scheme that three-phase CT, zero sequence CT and residual voltage circuit do not power is to protective device Power supply is provided；

Under fault condition, is exported in DC power supply current supply circuit without electric signal while protective device experiences breaker control When circuit processed and the equal power supply of DC power system disappear, power supply control preferentially uses non-faulting phase voltage with switching circuit, contains line Road voltage, residual voltage and faulted phase current and zero-sequence current provide power supply, the side that when off-capacity is powered by storage capacitor again Case provides power supply to protective device；That is non-faulting phase voltage, containing line voltage distribution according to maximum allowable in full using capacity equal proportion Power supply, insufficient section is preferentially fully powered according to maximum allowable using capacity by residual voltage, then insufficient section is mutually electric by failure Stream is fully powered according to maximum allowable using capacity equal proportion, then insufficient section uses capacity according to maximum allowable by zero-sequence current Power supply in full, then insufficient section are provided by storage capacitor；When substation bus bar has three-phase voltage to be less than no-voltage definite value, and three When phase CT is respectively less than without stream action value, protective device provides power supply to protective device using the scheme of storage capacitor power supply.

Wherein, the storage capacitor power supply capacity was chosen by 50VA power-on time 1 second；The PT allow using capacity be can Setting value, the electric current allow using capacity be can setting value.

Wherein, voltage blocking element and current judgement element are provided in the protective device.

In above scheme, breaker control circuit power supply decompression signal and transforming plant DC power supply are received by protective device System decompression signal；In the decompression signal for collecting breaker control circuit power supply decompression signal, transforming plant DC power-supply system Afterwards, whether disappeared by the voltage and current signal on protective device monitoring and protecting device DC power supply current supply circuit, If not disappearing, protected by first communication module described inside protective device by fibre-optic current differential protection communication loop opposite side Protection unit issues abnormality alarming signal, and the second communication module issues the exception to monitoring system and accuses inside the protective device of opposite side Alert signal；It is carried out from DC power supply powering mode to CT, the switching of PT auxiliary power supply mode by power supply control with switching circuit； Being monitored by protective device whether there is voltage or current signal on CT, PT auxiliary power supply circuit, judge DC power supply power supply mould Whether formula has been switched to CT, PT auxiliary power supply mode；If so, passing through light by first communication module described inside protective device Fine current differential protection communication loop opposite side protective device feedback signal, inside the protective device of opposite side the second communication module to The signal is given in monitoring system, if it is not, delay passes through protective device after waiting judges special DC power supply powering mode again Whether CT, PT auxiliary power supply mode is had been switched to, if it is not, then by storage capacitor loop power supply, and electricity is issued by protective device Source power switching failure alarm signal, while passing through fibre-optic current differential protection communication loop to opposite side protective device feedback letter Number, monitoring system will be sent in information by opposite side protective device；Whether broken down by protective device detection system, if so, passing through Fibre-optic current differential protection communication loop to opposite side protective device feedback signal, by opposite side protective device through adjusting delay tripping its The breaker that this side is connected, and monitoring system will be given in information.

In above scheme, the protective device at substation's electric power incoming line interval be all made of special DC power supply and through three-phase CT, Auxiliary power supply is isolated in zero sequence CT, residual voltage, route PT and three-phase PT, when protective device detects DC supply interruption, warp Power supply control is switched to CT and PT with switching circuit and powers, while to prevent protective device short-time loss of power supply in power supply handoff procedure, Auxiliary power supply is carried out configured with storage capacitor in protective device；When the protective device at substation's electric power incoming line interval switches to three When phase CT, zero sequence CT, residual voltage, route PT and three-phase PT isolation power supply, protective device preferentially uses PT and CT to power jointly Mode, when bus phase PT voltage is lower than without pressure definite value, phase PT current supply circuit is controlled by power supply and switching circuit is broken It opens, is powered at this time by other phase PT and three-phase CT power supply mode.

In above scheme, protective device is had using the design of CT auxiliary power supply circuit calculates CT consumed by protective device in real time The circuit of secondary power value and function, and in real time by the calculated value compared with it can adjust permissible value 1 and carry out online, when the calculated value It is automatic to carry out bis- output error compensation of CT when greater than permissible value 1 can be adjusted, prevent CT saturation from causing protection misoperation；Protection Device has circuit and the function for calculating PT secondary power value consumed by protective device in real time using the design of PT auxiliary power supply circuit, And in real time by the calculated value compared with it can adjust permissible value 2 and carry out online, when the calculated value, which is greater than, to adjust permissible value 2, from It is dynamic to reduce PT output power until being less than or equal to that permissible value 2 is adjusted, prevent PT overload from damaging.

In above scheme, the storage capacitor power supply capacity was chosen by 50VA power-on time 1 second；It is required that this substation bus bar And the every phase of inlet wire PT allows this protection to be more than or equal to 17VA using capacity.It is required that the every phase of this transforming plant lead-in CT allows this protection to make It is more than or equal to 5VA with capacity, and after bis- output error compensation of CT automatic in this protection, the CT output distortion factor does not cause to protect Malfunction, above this protection of permission are that can adjust capacity using PT, CT capacity.

In above scheme, when substation's power circuit protective device receives this side breaker control circuit of route and substation The signal of the equal decompression of DC power system, and protective device has monitored this protective device special DC power supply power supply loop signal It disappears, and has successfully switched to through CT and PT auxiliary power supply loop power supply, as that primary system is not detected is faulty for protective device In the presence of, this side protective device can be adjusted delay and be sent by fibre-optic current differential protection communication loop to opposite side protective device Following information: the disappearance of this side protective device special DC power supply of route, breaker control circuit and transforming plant DC power source bus Decompression, 1 phase of our station bus, 2 phases or 3 phase voltages disappear or busbar voltage is normal；After opposite side protective device receives above- mentioned information, warp Delay, which can be adjusted, will send monitoring system in above- mentioned information.

In above scheme, when substation's power circuit protective device receives this side breaker control circuit of route and substation The signal of the equal decompression of DC power system, and protective device has monitored this protective device special DC power supply power supply loop signal It disappears, and has successfully been switched to through CT and PT auxiliary power supply loop power supply, deposited as protective device detects that primary system is faulty When, start long-range failure protection breakdown judge program, at this time as cooperation route opposite side protective device judge that failure is located at optical fiber Within the scope of differential protection, then trip signal is issued for the breaker tripping of route opposite side by opposite side protective device, such as cooperate route pair Side protective device judges that failure is located at outside optical fiber differential protective range, and fault current mode flows to this transformer substation side, then this side Route protection then issues the starting long-range failure protection trip signal in opposite side for route opposite side breaker to opposite side line protective devices Tripping, failure protection trip signal in opposite side must close before issuing through the criterion of its voltage blocking element and current judgement element at this time Lock, and trip signal could be issued after delay can be adjusted.

Compared with prior art, the beneficial effects of the present invention are:

It is provided by the invention a kind of based on the self-powered long-range failure protection system of protective device, it is confessed by protective device The setting in long-range each circuit of failure protection system of electricity has distinguished channel by opposite side protective device by its this side breaker tripping Abnormal and protection power source power loss, effectively preventing protective device can not tripping circuit breaker and bring further loss in time.

Detailed description of the invention

Fig. 1 is a kind of based on the self-powered long-range failure protection system module connection figure of protective device.

Fig. 2 is 110kV line system wiring substation C short circuit current direction schematic diagram in D1 point failure.

Fig. 3 is 110kV line system wiring substation C short circuit current direction schematic diagram in D2 point failure.

Fig. 4 is 110kV line system wiring substation C short circuit current direction schematic diagram in D3 point failure.

Wherein: 1, protective device；2, DC power supply current supply circuit；3, storage capacitor；4, CT, PT auxiliary power supply circuit；5, Power supply control and switching circuit；6, breaker control circuit；7, monitoring system；8, fibre-optic current differential protection communication loop；9, DC power system.

Specific embodiment

The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；

Below in conjunction with drawings and examples, the present invention is further elaborated.

Embodiment 1

As shown in Figure 1, a kind of be based on the self-powered long-range failure protection system of protective device, including protective device 1, direct current Power supply power supply circuit 2, storage capacitor 3, CT, PT auxiliary power supply circuit 4, power supply control and switching circuit 5, breaker control circuit 6, monitoring system 7, fibre-optic current differential protection communication loop 8 and DC power system 9；Wherein；

The DC power supply current supply circuit 2, storage capacitor 3, CT, PT auxiliary power supply circuit 4, breaker control circuit 6, electricity Source control is electric with the protective device 1 with switching circuit 5, fibre-optic current differential protection communication loop 8, DC power system 9 Property connection；

The protective device 1 is connect with 7 signal of monitoring system；

The protective device 1, DC power supply current supply circuit 2, storage capacitor 3, CT, PT auxiliary power supply circuit 4, with it is described Power supply control is electrically connected with switching circuit 5；

Protective device 1 and opposite side protective device 1 are electrical in described 8 protection systems of fibre-optic current differential protection communication loop Connection.

More specifically, the protective device 1 includes microprocessor, breakdown judge module, state acquisition and control module, the One communication module, second communication module, power module, voltage detection module and current detection module；Wherein:

The breakdown judge module, state acquisition and control module, first communication module, second communication module, power supply mould Block, voltage detection module, current detection module are electrically connected with the microprocessor respectively；

The voltage detection module and DC control and switching circuit are electrically connected；

The current detection module and DC control and switching circuit are electrically connected；

The breakdown judge module and DC control and switching circuit are electrically connected；

The state acquisition and control module and DC control and switching circuit, breaker control circuit 6 and DC power supply System 9 is electrically connected；

The first communication module and fibre-optic current differential protection communication loop 8 are electrically connected；

The second communication module is connect with 7 signal of monitoring system；

The power module and microprocessor, breakdown judge module, state acquisition and control module, first communication module, Second communication module, voltage detection module and current detection module electrical connection, provide working power；

The power module and 2 output end of DC power supply current supply circuit, 3 output end of storage capacitor, CT, PT auxiliary power supply return The electrical connection of road output end, receives power supply.

Wherein, the power supply control is supplied with switching circuit 5 and DC power supply current supply circuit 2, storage capacitor 3, CT, PT auxiliary Electrical circuit 4 is electrically connected:

The power supply control is responsible for monitoring DC power supply current supply circuit 2, storage capacitor 3, CT, PT auxiliary with switching circuit 5 Current supply circuit 4 exports electric signal and output power value is answered in control.

It is provided with power supply power supply control module on power supply control and switching circuit 5, by power supply power supply control module, DC power supply current supply circuit 2, storage capacitor 3, CT, PT auxiliary power supply circuit 4 are controlled to the power supply output mode of protective device 1, and The mode preferentially powered jointly using CT, PT after DC power supply current supply circuit 2 is without electric signal output, ratio of specifically powering is such as Under:

In the case of non-faulting, is exported in DC power supply current supply circuit 2 without electric signal while protective device 1 experiences open circuit When device control loop 6 and the equal power supply of DC power system 9 disappear, as the every phase of substation bus bar PT and line side PT allow protection to make When being all larger than with capacity equal to 17VA or more, is divided equally using bus three-phase PT and route PT and powered, three-phase CT, zero sequence CT and zero The scheme that sequence voltage circuit does not power provides power supply to protective device 1；

In the case of non-faulting, is exported in DC power supply current supply circuit 2 without electric signal while protective device 1 experiences open circuit When device control loop 6 and the equal power supply of DC power system 9 disappear, as the every phase of substation bus bar PT and line side PT allow protection to make When being respectively less than 17VA with capacity, power supply control is with switching circuit 5 using bus three-phase PT and route PT according to about needing power supply capacity Equal proportion power supply, insufficient section powered by storage capacitor 3, the scheme that three-phase CT, zero sequence CT and residual voltage circuit do not power to Protective device 1 provides power supply；

Under fault condition, is exported in DC power supply current supply circuit 2 without electric signal while protective device 1 experiences breaker When control loop 6 and the equal power supply of DC power system 9 disappear, power supply control preferentially uses non-faulting phase voltage with switching circuit 5, Power supply is provided containing line voltage distribution, residual voltage and faulted phase current and zero-sequence current, and when off-capacity is powered by storage capacitor 3 again Scheme to protective device 1 provide power supply；That is non-faulting phase voltage uses capacity equal proportion according to maximum allowable containing line voltage distribution Power supply in full, insufficient section is preferentially fully powered according to maximum allowable using capacity by residual voltage, then insufficient section is by failure Phase current is fully powered according to maximum allowable using capacity equal proportion, then insufficient section by zero-sequence current according to maximum allowable use Capacity is fully powered, then insufficient section is provided by storage capacitor 3；When substation bus bar has three-phase voltage to be less than no-voltage definite value When, and three-phase CT be respectively less than without stream action value when, protective device 1 using storage capacitor 3 power scheme to protective device 1 provide Power supply.

More specifically, 3 power supply capacity of storage capacitor was chosen by 50VA power-on time 1 second.

More specifically, voltage blocking element and current judgement element are provided in the protective device 1；The PT allows to make With capacity be can setting value, the electric current allow using capacity be can setting value.

In the specific implementation process, 6 power supply decompression signal of breaker control circuit and substation are received by protective device 1 9 decompression signal of DC power system；Collecting 6 power supply decompression signal of breaker control circuit, transforming plant DC power-supply system 9 Decompression signal after, be by the voltage and current signal on 1 monitoring and protecting device of protective device, 1 DC power supply current supply circuit 2 It is no to have disappeared, if not disappearing, fibre-optic current differential protection is passed through by the 1 inside first communication module of protective device 8 opposite side protective device 1 of communication loop issues abnormality alarming signal, and the inside of opposite side protective device 1 second communication module is to prison Control system 7 issues the abnormality alarming signal；By power supply control with switching circuit 5 carry out from DC power supply powering mode to CT, The switching of PT auxiliary power supply mode；Being monitored by protective device 1 whether there is voltage or electric current on CT, PT auxiliary power supply circuit 4 Signal, judges whether DC power supply powering mode has been switched to CT, PT auxiliary power supply mode；If so, by protective device 1 First communication module described in portion passes through 8 opposite side protective device of fibre-optic current differential protection communication loop, 1 feedback signal, opposite side protection The 1 inside second communication module of device gives the signal in monitoring system 7, if it is not, delay passes through protective device 1 again after waiting Once judge whether special DC power supply powering mode has been switched to CT, PT auxiliary power supply mode, if it is not, then by storage capacitor 3 loop power supplies, and power supply power supply handover failure alarm signal is issued by protective device 1, while passing through fibre-optic current differential protection Communication loop 8 will send monitoring system 7 to opposite side protective device feedback signal, by opposite side protective device in information；By protective device 1 Whether detection system breaks down, if so, passing through fibre-optic current differential protection communication loop 8 to opposite side protective device feedback letter Number, the breaker connected by opposite side protective device through adjusting delay its this system of tripping, and monitoring system will be given in information 7。

In the specific implementation process, the protective device 1 at substation's electric power incoming line interval is all made of special DC power supply and warp Auxiliary power supply is isolated in three-phase CT, zero sequence CT, residual voltage, route PT and three-phase PT, when protective device 1 detects that DC power supply disappears When mistake, CT and PT is switched to switching circuit 5 through power supply control and is powered, while to prevent protective device 1 in power supply handoff procedure Short-time loss of power supply configures storage capacitor 3 in protective device 1 and carries out auxiliary power supply；When the protection at substation's electric power incoming line interval fills Set 1 switch to three-phase CT, zero sequence CT, residual voltage, route PT and three-phase PT isolation power supply when, protective device 1 preferentially use PT And the common power supply mode of CT, when bus phase PT voltage is lower than without pressure definite value, phase PT current supply circuit is controlled and is cut by power supply It gains road 5 to be disconnected, be powered at this time by other phase PT and three-phase CT power supply mode.

In the specific implementation process, protective device 1 is had using the design of CT auxiliary power supply circuit calculates 1 institute of protective device in real time The circuit of the CT secondary power value of consumption and function, and in real time by the calculated value compared with it can adjust permissible value 1 and carry out online, when Greater than when can adjust permissible value 1, automatic bis- output errors of CT that carry out compensate the calculated value, prevent CT saturation from causing false protection Make；Protective device 1 is had using the design of PT auxiliary power supply circuit calculates returning for PT secondary power value consumed by protective device 1 in real time Road and function, and in real time by the calculated value compared with it can adjust permissible value 2 and carry out online, permission can be adjusted when the calculated value is greater than It is automatic to reduce PT output power until being less than or equal to that permissible value 2 is adjusted when value 2, prevent PT overload from damaging.

In the specific implementation process, 3 power supply capacity of storage capacitor was chosen by 50VA power-on time 1 second；It is required that this change Power station bus and the every phase of inlet wire PT allow this protection to be more than or equal to 17VA using capacity.It is required that the every phase of this transforming plant lead-in CT allows This protection is more than or equal to 5VA using capacity, and after bis- output error compensation of CT automatic in this protection, CT exports the distortion factor not Cause protection misoperation, above this protection of permission is that can adjust capacity using PT, CT capacity.

In the specific implementation process, when substation's power circuit protective device 1 receives this side breaker control circuit 6 of route And the signal of the equal decompression of transforming plant DC power-supply system 9, and protective device 1 monitors that 1 special DC power supply of this protective device supplies 2 signal of electrical circuit has disappeared, and has successfully been switched to through CT and PT auxiliary power supply loop power supply, and primary system, which is such as not detected, to be had In the presence of failure, this side protective device 1 can be adjusted delay and protect dress to opposite side by fibre-optic current differential protection communication loop 8 Set the following information of 1 transmission: route this 1 special DC power supply power supply circuit of side protective device, 2 blackout, breaker control circuit 6 and transforming plant DC power source bus decompression, 1 phase of our station bus, 2 phases or 3 phase voltages disappear or busbar voltage is normal；Opposite side protection After device 1 receives above- mentioned information, can be adjusted delay will send monitoring system 7 in above- mentioned information.

In the specific implementation process, when substation's power circuit protective device 1 receives this side breaker control circuit 6 of route And the signal of the equal decompression of transforming plant DC power-supply system 9, and protective device 1 monitors that 1 special DC power supply of this protective device supplies 2 signal of electrical circuit has disappeared, and has successfully been switched to through CT and PT auxiliary power supply loop power supply, such as detects that primary system has event In the presence of barrier, start long-range failure protection breakdown judge program, at this time as cooperation route opposite side protective device 1 judges that failure is located at Within the scope of optical fiber differential protective, then trip signal is issued for the breaker tripping of route opposite side, such as line of engagement by opposite side protective device 1 Road opposite side protective device 1 judges that failure is located at outside optical fiber differential protective range, and fault current mode flows to this transformer substation side, then This side route protection then issues the starting long-range failure protection trip signal in opposite side to opposite side line protective devices 1 and route opposite side is broken Road device tripping, opposite side failure protection trip signal must be through the criterion of its voltage blocking element and current judgement element before issuing at this time Locking, and trip signal could be issued after delay can be adjusted.

In the specific implementation process, as illustrated in fig. 2, it is assumed that 110kV substation C incoming breaker DL-C1, incoming breaker DL-C2 is in coincidence, and section switch 3DL is also in coincidence.If 110kV substation C direct current system decompression at this time, while becoming Entrance D1 point failure protection act sequence of the present invention in power station is as follows:

Due to 110kV substation C direct current system decompression, this transformer substation side power supply 110kV power circuit A and B is matched The protective device 1 set when detecting that present apparatus DC power signal disappears, is switched to CT with switching circuit 5 through power supply control And PT power supply state, while the design of above-mentioned protective device 1 has DC power supply switch amount input circuit, breaker control circuit 6 to lose The amount of compressing switch input circuit is turned on, while protective device 1 monitors the faulty presence of primary system, and protective device 1 judges For our station DC bus decompression, the faulty long-range failure protection program of starting of electric system.

In the specific implementation process, 110kV route A protection can not cut off breaker DL-C1 when D1 point failure, therefore pass through It is always existed by the short circuit current that 110kV route B is provided, i.e., when D1 point failure, on the one hand, the side 110kV route A substation C After protective device 1 is judged as that our station DC power supply decompression starts long-range failure protection program, the side substation C 110kV route A protection Device 1 sends following information: the side route A to the side substation A protective device 1 through special optic fibre current differential protection communication loop 8 1 DC supply interruption of protective device, breaker control circuit 6 and transforming plant DC power source bus decompression, breaker can not tripping, Failure cannot be cut off by this switch, and the direction of short circuit current is directed toward in protection zone, this side meets existing failure protection voltage blocking The open definite value of element and current judgement element movement definite value, can star long-range failure protection.As route A protection communication channel does not have There is interruption, then after the side substation A protective device 1 receives above- mentioned information, protective device 1 is through the member of failure protection voltage blocking on the spot After part and the control of current judgement element, be delayed the connected breaker of tripping through adjusting, realize remote failure point and substation A every From, and superior monitoring system 7 sends fault message；If route A protection communication channel is interrupted simultaneously in D1 point failure, then power transformation After the side A protective device 1 of standing can not receive above- mentioned information, being isolated for remote failure point and substation A cannot achieve.On the other hand, After 110kV route this transformer substation side of B protective device 1 is judged as that our station DC power supply decompression starts long-range failure protection program, become The power station side C 110kV route B protective device 1 is sent through fibre-optic current differential protection communication loop 8 to the side substation B protective device 1 Following information: this 1 special DC power supply of side protective device disappears, breaker control circuit 5 and transforming plant DC power source bus lose Pressure, breaker can not tripping, failure cannot cut off by this switch, and the direction of short circuit current is directed toward outside protection zone, this side satisfaction shows There are the open definite value of failure protection voltage blocking element and current judgement element movement definite value, can star long-range failure protection；Become After the power station side B protective device 1 receives above- mentioned information, protective device 1 is sentenced through failure protection voltage blocking element and electric current on the spot After other element control, through adjusting delay the connected breaker of tripping, remote failure isolation is realized, and superior monitoring system 7 is sent out Send fault message.After higher level's monitoring system 7 receives above- mentioned information, according to system wiring situation, by 110kV substation A side 110kV Route A breaker tripping, realization 7 remote failure point of higher level's monitoring system are isolated with substation A's, while will be with 110kV power transformation Other breakers that the C that stands is directly connected to are disconnected to gate-dividing state, and the substation and system is completely isolated, it is ensured that turn power supply at Decompression load is turned to be powered by other substations by function.It, will according to system wiring situation after monitoring system 7 receives above- mentioned information The 110kV route A breaker tripping of the side 110kV substation A, realize 7 remote failure point of higher level's monitoring system and substation A every From, while the other breakers being directly connected to 110kV substation C are disconnected to gate-dividing state, the substation and system is complete Full isolation, it is ensured that turn to power successfully, decompression load is turned to be powered by other substations.

In the specific implementation process, as shown in Figure 3, it is assumed that 110kV substation C incoming breaker DL-C1, incoming breaker DL-C2 is in coincidence, and section switch 3DL is also in coincidence.Such as 110kV substation C direct current system decompression at this time, while becoming Nearby D2 point failure protection act sequence of the present invention is as follows for power station C bus:

Due to 110kV substation C direct current system decompression, this transformer substation side power supply 110kV power circuit A and B is matched The protective device 1 set when detecting that present apparatus special DC power supply disappears, is switched to CT with switching circuit 5 through power supply control And PT power supply state, while the design of above-mentioned protective device 1 has DC power supply switch amount input circuit, breaker control circuit 6 to lose The amount of compressing switch input circuit is turned on, while protective device 1 monitors the faulty presence of primary system, and protective device 1 judges For 9 decompression of our station DC power system, the faulty long-range failure protection program of starting of electric system.

In the specific implementation process, since D2 point failure is outside the differential protection range of 110kV route A, also in 110kV Outside the differential protection range of route B, 110kV route A and 110kV route B this substation optical fiber differential protective circuit will not be moved Make, therefore, is always existed via the short circuit current that 110kV route A and 110kV route B is provided, i.e., when D2 point failure, 110kV Route A and 110kV route this transformer substation side of B protective device 1 is being judged as the long-range failure guarantor of our station DC power supply decompression starting After protecting program, the side substation C 110kV route A and 110kV route B protective device 1 is distinguished through special optic fibre differential protection loop Following information is sent to substation A and the side substation B protective device 1: 1 DC supply interruption system of the side substation C protective device, Breaker control circuit 6 and transforming plant DC power source bus decompression, breaker can not tripping, failure cannot cut off by this switch, The direction of short circuit current is directed toward outside protection zone, and the side substation C meets the open definite value of existing failure protection voltage blocking element and electricity It flows discriminating element and acts definite value, can star long-range failure protection；After opposite side protective device 1 receives above- mentioned information, protection dress 1 is set after failure protection voltage blocking element on the spot and the control of current judgement element, through adjusting delay the connected open circuit of tripping Device realizes remote failure isolation, and superior monitoring system 7 sends fault message.Higher level's monitoring system 7 receives above- mentioned information Afterwards, according to system wiring situation, the other breakers being directly connected to 110kV substation C are disconnected to gate-dividing state, by the change Power station is completely isolated with system, it is ensured that turns to power successfully, decompression load is turned to be powered by other substations.

In the specific implementation process, it is assumed that 110kV substation C incoming breaker DL-C1, incoming breaker DL-C2 is in coincidence, and section switch 3DL is also in coincidence.Such as 110kV substation C direct current system decompression at this time, while becoming Movement in D2 point occurs with failure for the following equipment region D3 point failure of the 110kV bus of power station C protection act sequence of the present invention Sequentially.

Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention Protection scope within.

Claims (6)

1. one kind is based on the self-powered long-range failure protection system of protective device, it is characterised in that: including protective device (1), directly Galvanic electricity source current supply circuit (2), storage capacitor (3), CT, PT auxiliary power supply circuit (4), power supply control and switching circuit (5), open circuit Device control loop (6), monitoring system (7), fibre-optic current differential protection communication loop (8) and DC power system (9)；Wherein；

The DC power supply current supply circuit (2), storage capacitor (3), CT, PT auxiliary power supply circuit (4), breaker control circuit (6), power supply control with switching circuit (5), fibre-optic current differential protection communication loop (8), DC power system (9) with it is described Protective device (1) is electrically connected；

The protective device (1) connect with the monitoring system (7) signal；

The protective device (1), DC power supply current supply circuit (2), storage capacitor (3), CT, PT auxiliary power supply circuit (4) with The power supply control is electrically connected with switching circuit (5)；

Protective device (1) and opposite side protective device (1) in the fibre-optic current differential protection communication loop (8) and this protection system It is electrically connected.

2. according to claim 1 a kind of based on the self-powered long-range failure protection system of protective device, it is characterised in that: The protective device (1) includes microprocessor, breakdown judge module, state acquisition and control module, first communication module, second Communication module, power module, voltage detection module and current detection module；Wherein:

The breakdown judge module, state acquisition and control module, first communication module, second communication module, power module, electricity Detection module, current detection module is pressed to be electrically connected respectively with the microprocessor；

The voltage detection module and DC control and switching circuit (5) are electrically connected；

The current detection module and DC control and switching circuit (5) are electrically connected；

The breakdown judge module and DC control and switching circuit (5) are electrically connected；

The state acquisition and control module and DC control and switching circuit (5), breaker control circuit (6) and DC power supply System (9) is electrically connected；

The first communication module and fibre-optic current differential protection communication loop (8) are electrically connected；

The second communication module is connect with monitoring system (7) signal；

The power module and microprocessor, breakdown judge module, state acquisition and control module, first communication module, second Communication module, voltage detection module and current detection module electrical connection, provide working power；

The power module and DC power supply current supply circuit (2) output end, storage capacitor (3) output end, CT, PT auxiliary power supply return The electrical connection of road (4) output end, receives power supply.

3. according to described in claim 1 a kind of based on the self-powered long-range failure protection system of protective device, it is characterised in that: institute State power supply control and switching circuit (5) and DC power supply current supply circuit (2), storage capacitor (3), CT, PT auxiliary power supply circuit (4) Electrical connection:

The power supply control is responsible for monitoring that DC power supply current supply circuit (2), storage capacitor (3), CT, PT are auxiliary with switching circuit (5) Current supply circuit (4) output electric signal and control is helped to answer output power value.

4. according to claim 3 a kind of based on the self-powered long-range failure protection system of protective device, it is characterised in that: It is provided with power supply power supply control module on the power supply control and switching circuit (5), by power supply power supply control module, control is straight Galvanic electricity source current supply circuit (2), storage capacitor (3), CT, PT auxiliary power supply circuit (4) to protective device (1) power output mode, And the mode preferentially powered jointly using CT, PT after DC power supply current supply circuit (2) is without electric signal output, ratio of specifically powering Under such as:

In the case of non-faulting, is exported in DC power supply current supply circuit (2) without electric signal while protective device (1) experiences open circuit When device control loop (6) and DC power system (9) equal power supply disappear, when the every phase of substation bus bar PT and line side PT allow to protect When shield is all larger than using capacity equal to 17VA or more, is divided equally using bus three-phase PT and route PT and powered, three-phase CT, zero sequence CT And the scheme that residual voltage circuit does not power provides power supply to protective device (1)；

In the case of non-faulting, is exported in DC power supply current supply circuit (2) without electric signal while protective device (1) experiences open circuit When device control loop (6) and DC power system (9) equal power supply disappear, when the every phase of substation bus bar PT and line side PT allow to protect When shield is respectively less than 17VA using capacity, power supply control uses bus three-phase PT and route PT according to about needing to supply with switching circuit (5) The power supply of capacitance equal proportion, insufficient section are powered by storage capacitor (3), and three-phase CT, zero sequence CT and residual voltage circuit do not power Scheme to protective device (1) provide power supply；

Under fault condition, is exported in DC power supply current supply circuit (2) without electric signal while protective device (1) experiences breaker When control loop (6) and DC power system (9) equal power supply disappear, power supply control preferentially uses non-faulting with switching circuit (5) Phase voltage provides power supply containing line voltage distribution, residual voltage and faulted phase current and zero-sequence current, again by energy storage electricity when off-capacity The scheme for holding (3) power supply provides power supply to protective device (1)；That is non-faulting phase voltage makes containing line voltage distribution according to maximum allowable It is fully powered with capacity equal proportion, insufficient section is preferentially fully powered according to maximum allowable using capacity by residual voltage, or else Foot point is fully powered according to maximum allowable using capacity equal proportion by faulted phase current, then insufficient section by zero-sequence current according to It is maximum allowable fully to be powered using capacity, then insufficient section is by storage capacitor (3) offer；When substation bus bar has three-phase voltage small When no-voltage definite value, and three-phase CT be respectively less than without stream action value when, protective device (1) use storage capacitor (3) power supply side Case provides power supply to protective device (1).

5. according to claim 4 a kind of based on the self-powered long-range failure protection system of protective device, it is characterised in that: Storage capacitor (3) power supply capacity was chosen by 50VA power-on time 1 second；The PT allow using capacity be can setting value, institute State electric current allow using capacity be can setting value.

6. described in any item one kind are based on the self-powered long-range failure protection system of protective device according to claim 1 ~ 5, It is characterized in that: being provided with voltage blocking element and current judgement element on the protective device (1).