36results about How to "Simple cooperation" patented technology

The invention provides an automatic door lock, comprising a lock shell having a dead bolt hole molded with dead lock hole; a lock assembly installed on the lock shell panel and the lock shell bottom panel corresponding to a molded lock installation hole; a bolt mechanism installed in the lock shell capable of moving along the direction perpendicular to the lock shell panel; a locking control mechanism for controlling the bolt in the bolt mechanism extruding from and retracting into the panel; and a bolt locking mechanism matched with the door handle operating mechanism. The automatic door lock implements engagement and disengagement of the stop member with a fixed stripe and a movable stripe by coupling of the fixed and the movable stripe, the stop member is capable of engaging with the fixed and the movable stripe at different positions, incomplete unlocking operation due to extrusion of a bolt partially retracted into the shell is prevented.

The invention discloses a washing machine door lock. The washing machine door lock comprises a lock case, a rotating part hooked up with a door hook and a locking device for locking or unlocking the rotating part combined with the door hook; the locking device comprises a first limiting part formed with a lug with a first inclined surface and capable of sliding left and right, a second limiting part formed with a second inclined surface matched with the first inclined surface and capable of sliding up and down, a limiting biasing part for applying bias pressure to the second limiting part towards the first limiting part, and a locking rod capable of locking or unlocking the second limiting part under the control of the first control device; the rotating part drives the first limiting part to move left and right by use of a first connecting structure; the limiting biasing element pushes the second limiting part to slide towards the first limiting part by virtue of the matching of the first inclined surface and the second inclined surface. According to the washing machine door lock, the rotating part is locked or unlocked by virtue of the sliding matching of the first limiting part, the second limiting part and the locking rod so that the washing machine door lock can be opened or closed; the washing machine door lock is easy to manufacture and assembly, and good in stability.

The invention provides an interlocking assembly and a cooking utensil. The interlocking assembly comprises a door hook, an interlocking support, an interlocking rotary block, a positioning torsional spring and a buffer device. According to the scheme, the buffer device is additionally arranged on the basis of an existing interlocking assembly, a door body is in an open state, the interlocking rotary block is in an unlocking position, and the door hook and the interlocking rotary block are separated; and in the door closing process, the door hook abuts against the interlocking rotary block and then pushes the interlocking rotary block to rotate, the buffer device applies resistance to the interlocking rotary block in the process that the interlocking rotary block rotates to a locking position from the unlocking position, momentum of the door body is reduced so that impact to a box body front plate can be reduced when the door body is closed, and thus the problem that paint of the box body front plate or the door body is peeled off due to the fact that door closing force of a user or a tension hinge is too large is solved.

The invention relates to a lock tongue locking mechanism matched with a door handle manipulation mechanism, which comprises a locking part of a lock tongue member, a door handle mounting hole, a shaft sleeve, a mandrel of the door handle manipulation mechanism and a contilever plate, wherein the door handle mounting hole is molded in the position of a door lock shell corresponding to the door handle; the shaft sleeve of which the sidewall is provided with a through groove is arranged in the door handle mounting hole; the mandrel of the door handle manipulation mechanism can axially slide, is rotatably arranged inside the shaft sleeve and a lug boss; the mandrel is provided with a shifting block radially extending; the shifting block is suitable for sliding in the through groove; the extending length of the shifting block is greater than the thickness of the shaft sleeve and the sidewall of the lug boss; the contilever plate is pivotally arranged on a journal of the shaft sleeve through a shaft sleeve mounting hole molded on the contilever plate; the arched part of the shaft sleeve mounting hole corresponding to the shifting block is provided with a shifting groove; and the shifting block is embedded into the shifting groove. The lock tongue locking mechanism solves the technical problems that parts of the lock body are overmany and have small strength and the requirement of mounting precision is high, and is particularly suitable for an inserted core lockset.

The invention discloses a braking mechanism for a baby carriage. The braking mechanism comprises a wheel shaft, a pair of braking hubs, a pair of pedal pieces and a linkage pipe, wherein the braking hubs are fixed inside wheels of the baby carriage; the wheel shaft is mounted between a pair of wheels of the baby carriage; the pedal pieces are sleeved on the wheel shaft; a plurality of bulges, which encircle the wheel shaft and are distributed at intervals, are arranged on the braking hubs; a blocking slot is formed between adjacent bulges; a braking assistor is formed by protruding from one side wall of the pedal pieces to the braking hubs; the linkage pipe is sleeved on the wheel shaft; and the pedal pieces are connected to the two ends of the linkage pipe. Compared with the prior art, the braking mechanism for the baby carriage provided by the invention has the advantages that the linkage pipe is sleeved on the wheel shaft and is connected with the pedal pieces, and when any one of the pedal pieces is operated for braking, the other pedal piece is driven to act by the linkage pipe, therbey achieving an effect of one-treading and double-braking. Besides, the braking assistor of the pedal pieces gets in / out of the blocking slots of the braking hubs, therbey realizing a braking / actuating process of the braking mechanism for the baby carriage. The braking mechanism for the baby carriage has the advantages of simple structure, simple matching relation between the braking assistor and the blocking slots, and low cost. Meanwhile, the invention discloses the baby carriage.

The invention relates to a three-clamping lock comprising a lock case, a three-clamping reed and an eccentric gear. The three-clamping lock is disposed in the lock case, a hole matched with the eccentric gear is formed in the three-clamping reed which moves frontwards and backwards through rotation of the eccentric gear in the hole, the lock shell is formed by stamping a seamless steel pip with a rectangular section, a rear cap is arranged at the rear end of the lock case, and a lower support used for supporting the rear end of the three-clamping reed is arranged on the inner side of the rear cover. By the three-clamping lock, manual torque is prevented from increasing to cause loosening of a lock head, and capability of lateral stopping is greatly improved; meanwhile, manufacturing cost is lowered greatly, and the reed and the eccentric gear are matched more stably and effectively.

The invention relates to the field of packing machines, in particular to a reel package sealing method. The method includes the following steps: placing a reel object to be packaged on one side of a packaging film, tightening the packaging film to enable the packaging film to be tightly attached to the cambered surface of the outer surface of the reel object to be packaged, folding the packaging film located on the opening of the outer surface of the reel object to be packaged, keeping the reel object to be packaged stable in the folding process, and at last heat-sealing part of the folded edge. The reel package sealing method has the advantages that the packaging film attached to the cambered surface of the reel object to be packaged is folded after tightened, and after the folding, the folded portions are heat-sealed, so three layers of packaging film exist on the heat-sealing joint portion, and the heat-sealing structure of the three layers of packaging film enables the fastness on the sealing portion of the reel package to be substantially promoted.

The invention provides a cooling utensil. The cooking utensil comprises a pot body and a pot cover covering the pot body, wherein an uncovering button is arranged on the pot body; and the pot cover comprises a pot tooth ring component. The cooking utensil is characterized by further comprising a mis-uncovering prevention structure, wherein the mis-uncovering prevention structure comprises a main part; a guiding structure is arranged on the pot tooth ring component; and when the pot tooth ring component rotates, the main part moves in the axial direction under the action of the guiding structure, so that the main part can restrict the action of the uncovering button when the pot tooth ring component and the pot body are in a locked state. The cooking utensil can prevent mis-uncovering in both the non-working state and the working state. Meanwhile, as the main part in the mis-uncovering prevention structure adopts an integrated structure, the matching relationship and structure and the connection relationship between all parts are simple, the reliability is high, and mis-uncovering can be effectively prevented.

The invention provides a zero-sequence backup protection setting method for an ultra-high voltage transmission line. The method comprises the following steps of: (1) configuring zero-sequence backup protection in a four-section form, deleting a zero-sequence backup protection I section and a zero-sequence backup protection section II, and reserving a zero-sequence backup protection section III and a zero-sequence backup protection section IV; (2) dividing the zero-sequence backup protection section III into a reference-side zero-sequence backup protection section III and a non-reference-side zero-sequence backup protection section III and respectively performing setting by utilizing a reference side; and (3) dividing the zero-sequence backup protection section IV into a reference-side zero-sequence backup protection section IV and a non-reference-side zero-sequence backup protection section IV and respectively performing setting by utilizing the reference side, wherein the reference side refers to any station end, of which an opposite station end adopts optical differential protection for all outgoing lines, on the transmission line. On the premise of no increase of the security risk of a power grid, the adaptability of a constant value to power grid change is improved, the protection constant value regulation caused by coordinating with constant value regulation is reduced and the workload of the setting calculation is greatly reduced simultaneously.

The invention discloses a line bus integrated backup protection method using a pilot comparison principle based on the fault direction. The method comprises the steps: taking a breaker as the center, determining the electrical elements related with the breaker and the backup protection functions, and incorporating the backup protection functions in the same protector to complete; determining the fault direction information is interacted among which protectors, and the mode for interaction of the fault direction information; comparing the fault direction information when a fault occurs, and determining the position wherein the fault is according to the compared result of the fault direction information; and determining the motion strategy for backup protection. The line bus integrated backup protection method using a pilot comparison principle based on the fault direction has the advantages of reducing the quantity of backup protection, simplifying the coordination relationship among backup protection, simplifying the control loop of the breaker, improving the reliability for working of a secondary system, being able to determining the fault position rapidly and reliably when the fault occurs, and improving the rapidity and the reliability of the backup protection motion.

The invention provides a limiting type rocket separation impulse providing device based on a spring. The limiting type rocket separation impulse providing device comprises a sleeve and an ejector rod located in the sleeve, one end of the ejector rod extends out of the sleeve, the outer side of the other end of the ejector rod is sleeved with the spring, and a polygonal limiting section is arranged on the outer side wall of the ejector rod. A cavity section matched with the polygonal limiting section in shape is arranged in an inner cavity of the sleeve, limiting holes capable of being matched with a positioning pin are formed in the outer side wall of the ejector rod and the side wall of the sleeve respectively, and the center distance between the limiting hole in the ejector rod and the limiting hole in the sleeve is equal to the working stroke of the spring. The device can ensure that the ejector rod only moves in the axial direction to push the separation section of the rocket along with gradual release of the compression spring, and therefore separation impulse loss is prevented.

The invention belongs to the technical field of power system relay protection, and particularly relates to a logical judgment-based substation area protection system and method. The system is characterized by comprising a data reading module, a logic judgment module and a protection action module which are sequentially connected. The method comprises the steps of collecting data; obtaining fault information through logic judgment by using a collected secondary protection device action logic signal of a substation; and sending out a tripping signal to a corresponding circuit breaker according to the fault information. According to the logical judgment-based substation area protection system and method, the backup protection performance of in-station components is effectively improved; the problems that traditional staged backup protection is difficult to match and the action delay is long are solved; and the logical judgment-based substation area protection system and method are simple, reliable and easy to implement.

The invention discloses a universal seat rotating mechanism which comprises a base, a motor is fixed in the base, a motor shaft penetrates through the base, a locking device is installed on the motor shaft, a synchronizer is installed in cooperation with the locking device, a sliding ring wire connector and a rotating disc are arranged on the base, and an adaptive support is fixed to the rotating disc. The locking device comprises a movable locking device and a fixed locking device, the movable locking device is arranged on the fixed locking device and matches the movable locking device through a groove and a protrusion, the synchronizer matches the movable locking device through a special-shaped concave-convex structure, the rotating disc comprises a fixed connecting ring and a movable connecting cylinder, the fixed connecting ring is sleeved with a concave ring of the movable connecting cylinder, the fixed connecting ring is fixed to the outer edge of the base, the adaptive support is fixed on the movable connecting cylinder, and the locking device is exposed through a hollow area on the adaptive support. The base is allowed to be not coaxial with a rotating part of an automobile seat, manufacturing and assembling errors can be compensated, and meanwhile selection of the type of the locking device is increased.

This invention relates to a lifting support unit of a plastering device of a plastering machine which is composed of a square frame and four rolling wheels at the four corners of the frame, the four rolling wheels are in the same plane parallel to the frame. Since the supporting unit is composed of a square frame and rolling wheels, they only coordinate with two longitudinal sideways at both sides, the matched relation is simplified and easy to be regulated, besides, its easy to mount / dismantle the two horizontal formed by two plug-in sections.

The invention discloses a conveniently assembled and maintained axle speed reducer for solving the problems of more related parts in the assembly link, assembling quality and efficiency influences, field maintenance difficulty and the like existing in the existing traditional axle speed reducer. The conveniently assembled and maintained axle speed reducer comprises a speed reducer shell, a power input shaft supporting structure, an axle shell, a half shaft, a differential and a driven gear. The conveniently assembled and maintained axle speed reducer is technically characterized in that the power input shaft supporting structure is composed of two columns of bearings with the same outer ring structures, input torque flanges for fastening and supporting the bearings and locking nuts, wherein outer rings of the two columns of bearings are assembled in bearing assembling holes with the same internal diameters of the speed reducer shell; and inner rings are fastened and supported on the corresponding shaft diameters of a driving gear shaft through the input torque flanges and the locking nuts. The conveniently assembled and maintained axle speed reducer is simplified in structure, reasonable in design and convenient in assembling and field maintaining operations; and instability caused by speed reducer bearing assembling and pre-tightening and clearance variation is effectively eliminated, the bearing assembling precision is remarkably improved, the vibration noise and rotation resistance of the power input shaft supporting structure is reduced, and the service life of the speed reducer is prolonged.

The invention relates to the technical field of protection of charging pile housings and particularly provides a charging pile and a housing thereof. The charging pile comprises the housing and electric elements, wherein the electric elements are arranged inside the housing; the housing comprises a shell and a bin gate which is matched with the shell; the housing is provided with a door lock usedfor locking the bin gate; the door lock comprises a lock core; the shell or the bin gate is provided with a lock hole of which the opening is downward; and the lock core is arranged inside the lock hole. A lock body is arranged in the lower direction in a hidden manner so that other people are difficult to find the lock body without careful observation, so the safety of the charging pile is improved; and meanwhile the lock body is arranged in a hidden manner, so the good-looking degree of the charging pile is increased as well.

The invention discloses a gear shifting locking device. The device comprises a shifting fork shaft, a main gear locking piece and an auxiliary gear locking piece, the main gear locking piece and the auxiliary gear locking piece are used for axially locking the shifting fork shaft, and the main gear locking piece and the auxiliary gear locking piece are in linkage fit so that the main gear locking piece can synchronously drive the auxiliary gear locking piece in the shifting fork shaft unlocking process so that the auxiliary gear locking piece can be synchronously unlocked. The shifting fork shaft can be locked through the main gear locking piece and the auxiliary gear locking piece, so that the gear shifting fork stays at a certain gear position, the gear locking stability is high, and it can be guaranteed that gear skipping does not occur in the neutral position; when the external driving force on the shifting fork shaft exceeds a specific value, the main gear locking piece is unlocked, the auxiliary gear locking piece is synchronously driven to be unlocked, the two gear locking pieces are unlocked in a linkage mode, the axial driving force needed by the shifting fork shaft during unlocking is increased, the auxiliary gear locking piece does not depend on the axial pushing force of the shifting fork shaft during unlocking, and the matching relation between the auxiliary gear locking piece and the shifting fork shaft is simplified.

The invention provides an interlocking assembly and a cooking utensil. The interlocking assembly comprises a door hook, an interlocking support, an interlocking rotary block, a positioning torsional spring and a buffer device. According to the scheme, the buffer device is additionally arranged on the basis of an existing interlocking assembly, a door body is in an open state, the interlocking rotary block is in an unlocking position, and the door hook and the interlocking rotary block are separated; and in the door closing process, the door hook abuts against the interlocking rotary block and then pushes the interlocking rotary block to rotate, the buffer device applies resistance to the interlocking rotary block in the process that the interlocking rotary block rotates to a locking position from the unlocking position, momentum of the door body is reduced so that impact to a box body front plate can be reduced when the door body is closed, and thus the problem that paint of the box body front plate or the door body is peeled off due to the fact that door closing force of a user or a tension hinge is too large is solved.

The invention discloses a locking pin, and relates to the technical field of mechanical connecting components. The locking pin comprises a pin body, wherein the pin body is a straight rod, a groove is formed in the side of the pin body, a cover plate used for sealing the notch of the groove is mounted on the pin body, a movable tenon and an elastomer are clamped and arranged in a cavity which is formed by surrounding the cover plate and the groove, the movable tenon is provided with a tenon head which extends out of the pin body from the groove wall of the groove and limiting parts which are placed in the groove, one ends which are connected with the tenon head of the limiting parts are butted against to the groove wall of the groove, the free ends of the limiting parts are in butted connection to the elastomer, and the limiting parts and the elastomer are sealed in the cavity. Compared with the prior art, the locking pin disclosed by the invention has the advantages that the locking pin is more suitable for the severe environment, the service life is long, the structure is simple, the processing and the assembling are easy, the component replacement is convenient, and the usage cost is low.

This invention relates to a lifting support unit of a plastering device of a plastering machine which is composed of a square frame and four rolling wheels at the four corners of the frame, the four rolling wheels are in the same plane parallel to the frame. Since the supporting unit is composed of a square frame and rolling wheels, they only coordinate with two longitudinal sideways at both sides, the matched relation is simplified and easy to be regulated, besides, its easy to mount / dismantle the two horizontal formed by two plug-in sections.

The invention discloses a laser spectrophotometer. The laser spectrophotometer comprises a light splitting disc, an absorption tank and a detector, wherein the light splitting disc comprises a plurality of single-color laser devices; the plurality of single-color laser devices are arranged on the light splitting disc at intervals along the circumference, so that the switching of the single-color laser devices is realized through rotating the light splitting disc; the absorption tank is used for storing a test sample to be measured; the absorption tank is arranged at the rear end of the light splitting disc; the detector is arranged at the rear end of the absorption tank so that one single-color laser device in the light splitting disc emits laser and the laser passes through the absorption tank to reach the detector; and the detector is used for detecting relative parameters of the laser passing through the absorption tank. The invention provides the laser spectrophotometer which is used for measuring through the rotary single-color laser devices; and by taking a plurality of monochromatic light with relatively good coherence as a measurement light source, the disadvantage that the measurement precision of a spectrophotometer in the prior art is not high is improved, and the laser spectrophotometer has relatively wide applicability and practical value.

The invention belongs to the technical field of power system relay protection, and particularly relates to a logical judgment-based substation area protection system and method. The system is characterized by comprising a data reading module, a logic judgment module and a protection action module which are sequentially connected. The method comprises the steps of collecting data; obtaining fault information through logic judgment by using a collected secondary protection device action logic signal of a substation; and sending out a tripping signal to a corresponding circuit breaker according to the fault information. According to the logical judgment-based substation area protection system and method, the backup protection performance of in-station components is effectively improved; the problems that traditional staged backup protection is difficult to match and the action delay is long are solved; and the logical judgment-based substation area protection system and method are simple, reliable and easy to implement.

The invention discloses a washing machine door lock. The washing machine door lock comprises a lock case, a rotating part hooked up with a door hook and a locking device for locking or unlocking the rotating part combined with the door hook; the locking device comprises a first limiting part formed with a lug with a first inclined surface and capable of sliding left and right, a second limiting part formed with a second inclined surface matched with the first inclined surface and capable of sliding up and down, a limiting biasing part for applying bias pressure to the second limiting part towards the first limiting part, and a locking rod capable of locking or unlocking the second limiting part under the control of the first control device; the rotating part drives the first limiting part to move left and right by use of a first connecting structure; the limiting biasing element pushes the second limiting part to slide towards the first limiting part by virtue of the matching of the first inclined surface and the second inclined surface. According to the washing machine door lock, the rotating part is locked or unlocked by virtue of the sliding matching of the first limiting part, the second limiting part and the locking rod so that the washing machine door lock can be opened or closed; the washing machine door lock is easy to manufacture and assembly, and good in stability.

The invention relates to a split internal combustion engine and particularly belongs to the technical field of internal combustion engines. The split internal combustion engine comprises a first cylinder, a second cylinder, a temperature control device and a valve device, wherein the temperature control device is connected with the first cylinder and the second cylinder. A first piston is arranged in the first cylinder and a second piston is arranged in the second cylinder. The valve device comprises an air inlet valve arranged on the first cylinder, an exhaust valve arranged on the second cylinder and valve control devices of the air inlet valve and the air outlet valve. The first cylinder is used for an air suction stroke and a compression stroke, and the second cylinder is used for a combustion stroke and an exhaust stroke. By means of the split internal combustion engine, a high compression ratio can be obtained, the detonation phenomenon is prevented, combustion efficiency of fuel is improved, energy loss is reduced, and the service life of the cylinders is prolonged.

The present invention provides a cooking appliance. The cooking utensil includes a pot body and a pot cover that is covered on the pot body, the pot body is provided with a lid opening button, and the pot cover includes a pot tooth ring assembly, characterized in that the cooking utensil further includes an error-proof The opening structure, the anti-misopening structure includes a main body, and a guide structure is arranged on the screw ring assembly. When the screw ring assembly rotates, the main body is axially driven by the guide structure. directional movement, so that when the tooth ring assembly and the pot body are in a locked state, the main body member can limit the action of the lid opening button. The cooking utensil of the present invention can play the function of preventing accidental opening in both the non-working state and the working state. At the same time, the main body in the anti-misopening structure is an integral structure, and the coordination relationship, structure and connection relationship between the various components are simple, and the reliability is strong, which can effectively prevent the accidental opening of the cover.

The invention discloses an external buckle mechanism for precise stroke control, comprising a stroke control mechanism and a sequence control mechanism. The stroke control mechanism is used to precisely control the stroke of a mold when the mold is opened, so that the mold can be opened smoothly at the same time. The plastic parts in the mold cavity will not be damaged; the sequence control mechanism is used to control the mold opening sequence of each mold opening surface of the mold, so as to ensure that the various parts of the mold act according to the set sequence; the stroke control mechanism It includes a trigger base and a trigger rod, and the trigger rod is partially slidably sleeved in the trigger base; the sequence control mechanism includes a first elastic block telescopically installed on the nozzle push plate and a telescopic The second elastic block is movably installed on the A plate; the component structure of the present invention and the cooperation relationship between them are simple, the structural strength and stability are good, and the mold opening distance of the mold opening surface and the mold opening and closing sequence can be accurately controlled. control to meet the production needs of different plastic products.

The invention provides an automatic door lock, comprising a lock shell having a dead bolt hole molded with dead lock hole; a lock assembly installed on the lock shell panel and the lock shell bottom panel corresponding to a molded lock installation hole; a bolt mechanism installed in the lock shell capable of moving along the direction perpendicular to the lock shell panel; a locking control mechanism for controlling the bolt in the bolt mechanism extruding from and retracting into the panel; and a bolt locking mechanism matched with the door handle operating mechanism. The automatic door lockimplements engagement and disengagement of the stop member with a fixed stripe and a movable stripe by coupling of the fixed and the movable stripe, the stop member is capable of engaging with the fixed and the movable stripe at different positions, incomplete unlocking operation due to extrusion of a bolt partially retracted into the shell is prevented.

The invention relates to a lock tongue locking mechanism matched with a door handle manipulation mechanism, which comprises a locking part of a lock tongue member, a door handle mounting hole, a shaft sleeve, a mandrel of the door handle manipulation mechanism and a contilever plate, wherein the door handle mounting hole is molded in the position of a door lock shell corresponding to the door handle; the shaft sleeve of which the sidewall is provided with a through groove is arranged in the door handle mounting hole; the mandrel of the door handle manipulation mechanism can axially slide, is rotatably arranged inside the shaft sleeve and a lug boss; the mandrel is provided with a shifting block radially extending; the shifting block is suitable for sliding in the through groove; the extending length of the shifting block is greater than the thickness of the shaft sleeve and the sidewall of the lug boss; the contilever plate is pivotally arranged on a journal of the shaft sleeve through a shaft sleeve mounting hole molded on the contilever plate; the arched part of the shaft sleeve mounting hole corresponding to the shifting block is provided with a shifting groove; and the shifting block is embedded into the shifting groove. The lock tongue locking mechanism solves the technical problems that parts of the lock body are overmany and have small strength and the requirement of mounting precision is high, and is particularly suitable for an inserted core lockset.

The invention discloses a distance back-up protection setting method of an ultrahigh voltage circuit. The distance back-up protection setting method of the ultrahigh voltage circuit comprises the following steps of: (1) carrying out three-section configuration on grounding distance spare protection and phase-to-phase distance protection respectively; and enabling each section of the grounding distance spare protection and the corresponding section of the phase-to-phase distance protection to use the same constant value; (2) setting the I section of the grounding distance spare protection by reliably avoiding metal faults occurring outside an area, so as to obtain a constant value of the I section of the grounding distance spare protection and a constant value of the I section of the phase-to-phase distance protection; (3) dividing the setting of the II section and the III section of distance spare protection into the setting of the II section or the III section of standard side distance spare protection and the setting of the II section or the III section of non-standard side distance spare protection according to a datum mark, so as to respectively obtain the constant value of the III section of the grounding distance spare protection and the constant value of the III section of the phase-to-phase distance spare protection. On the premise of not reducing security risk of a power grid, the adaptation capability of a spare protection constant value to an operation manner of the power grid is improved, and the working capacity of setting calculation is greatly reduced.