141 results about "Knife switch" patented technology

The invention belongs to the technical field of hot-line work, and particularly discloses a complete insulation baffle plate for replacing a disconnecting link load side lead in 10kV hot-line work and a use method, the complete insulation baffle plate comprises a hanging plate, and the hanging plate is of an insulated plane plate-shaped structure; the upper side edge and the lower side edge of the hanging plate are provided with a cross arm hook and a baffle handle respectively. The cross arm hook is used for being matched with a cross arm; one side surface of the hanging plate is provided with a disconnecting link inner side insulating cover; the carrying head baffle is arranged on the side of the hanging plate; the head carrying baffle is bent to be of a C-shaped structure, a second notch is formed in the bottom of the head carrying baffle, the second notch is provided with a disconnecting link outer side insulation cover, and the disconnecting link outer side insulation cover is matched with the disconnecting link inner side insulation cover and used for being matched with a disconnecting link. The disconnecting link shield is bent to be of a U-shaped structure; and the opening end of the disconnecting link shield is matched and connected with the bottom of the carrying head baffle plate. According to the invention, the electrified body and the grounding body can be effectively isolated, the structural stability in the operation process is improved, and the operation time and manpower consumption are reduced.

The invention discloses a method for detecting the state of an earthing knife circuit breaker based on deep learning and a key point detection calculation technology, and relates to the field of power equipment detection, and the method comprises the steps: collecting a visible light image; performing data enhancement processing; building a deep learning model and improving the model; an improved EDC-YOLO model is introduced and a GeoKeyNet method for key point geometric feature calculation is combined, accurate state judgment can be carried out on obvious and easily-recognized key points on a grounding knife switch, and particularly under the condition that some grounding knives have small displacement, key point detection can effectively capture subtle changes, so that the opening and closing state of the grounding knife switch is accurately recognized, and the detection accuracy of the grounding knife switch is improved. The method not only makes up the limitation of traditional sensor monitoring, but also provides an efficient, accurate and automatic monitoring scheme especially under the condition that subtle changes cannot be fully captured and comprehensive monitoring cannot be achieved, and the monitoring precision and the working efficiency of the grounding knife-switch circuit breaker can be remarkably improved.

The invention provides a 35kV isolation switch opening and closing device. The 35kV isolation switch opening and closing device comprises a substrate, a contact unit, a transmission assembly and a driving unit. The substrate is provided with two composite post insulators which are arranged at an interval; the contact unit comprises a first connecting part and a second connecting part, the first connecting part is connected with one composite post insulator, and the second connecting part can be connected with the other composite post insulator; the transmission assembly is arranged in the vertical direction, and the top end is connected with the second connecting part. The driving unit is connected with the bottom end of the transmission assembly and used for driving the transmission assembly to move in the vertical direction, and the transmission assembly drives the second connecting part to move; wherein the driving unit drives the transmission assembly to move, and the transmission assembly drives the second connecting part to be in contact with or disconnected from the corresponding composite post insulator, so that switching-on or switching-off is realized. The invention provides a 35kV isolation knife switch opening and closing device, and aims to solve the problem of poor safety caused by manual close-range opening and closing of an isolation knife switch in the prior art.

The invention relates to the technical field of disconnecting link maintenance and transformation, in particular to an isolation disconnecting link updating and transformation method. The method comprises the following steps: S1, performing inspection and quantitative analysis, performing equipment evaluation and problem diagnosis, and identifying operation problems and function deficiency; s2, performing model selection and material optimization, and setting a standard isolation switch and an electric operation assembly; s3, defining a transformation range, dividing transformation units based on the main wiring diagram, and covering the isolation disconnecting link and the grounding disconnecting link; s4, implementing a safety locking structure, adding an electrified locking and five-prevention system, and accessing whole plant management to prevent misoperation; and S5, accessing a monitoring system, and connecting an LCU screen and a computer monitoring system to realize remote centralized control. The contact resistance and temperature rise of the contact reach the standard, ablation is completely eradicated, the operating force and time are greatly reduced, jamming is returned to zero, the five-prevention locking success rate is extremely high, the misoperation drill can reach the zero penetration level, and the on-site actual effects of mechanical zero jamming, five-prevention zero penetration, remote control zero delay and old and waste utilization are achieved.

The application discloses a kind of on-load tap-changer monitoring devices, methods, equipment and storage medium, the device includes position sensor, current sensor and information acquisition processor, position sensor is set to the transmission assembly of on-load tap-changer, for detecting the action information of on-load tap-changer switching knife switch, current sensor is set to the power electronic component of on-load tap-changer and the loop of switching switch, for detecting the current information of the power electronic component, information acquisition processor is used to receive action information and current information, and action information and current information are exported.The on-load tap-changer monitoring device of the embodiment of the application can monitor the action information of switching knife switch and the current information of power electronic component in real time by installing position sensor on transmission assembly, setting current sensor in the loop of power electronic component and switching switch, installation position is reasonable, and it is convenient to monitor on-load tap-changer internal information.

The utility model relates to the technical field of disconnecting switches, and discloses a disconnecting switch which comprises a base, a first supporting column and a second supporting column are arranged on the base, a first tool apron and a second tool apron are arranged on the first supporting column and the second supporting column respectively, a switch blade is rotationally connected to the first tool apron, a rotating assembly is arranged on the switch blade, and the rotating assembly is connected to the second tool apron. The base is rotatably connected with a first rotating shaft, the base is provided with a limiting structure, the limiting structure comprises a first limiting plate, a second limiting plate and a moving rod, the base is rotatably connected with a second rotating shaft, and the second rotating shaft is provided with a grounding assembly. Therefore, the grounding assembly is kept in an opening state, an operator is prevented from mistakenly touching the grounding assembly, the situation that the disconnecting switch and the grounding assembly are closed at the same time is reduced, and the safety of the operator and equipment is further guaranteed.

The utility model relates to a high-voltage direct-current deicing isolating switch, which is structurally characterized in that a 550KV post insulator and a 35KV post insulator are parallelly arranged at the top of a base, a grading ring is arranged at the top of the 550KV post insulator, a static contact is arranged on the grading ring, and a main knife switch with a bending structure is arranged between the 35KV post insulator and the static contact; a bending control mechanism is arranged at the bottom of the main knife switch; an electric operating mechanism at the bottom of the base is connected with the bending control mechanism through an operating rod; and after the main knife switch is unfolded, the contact plate at the top is plugged with the static contact. According to the structure of the high-voltage direct-current ice-melting isolating switch, the conductive section of the conductive tube is increased, and the through-current capability of a product is improved; the main knife switch adopts a bending structure and has the characteristics of flexible rotation and strong corrosion resistance; the structure of the product is simplified, the later maintenance is facilitated, the maintenance period is prolonged, and the stability of switching-off and switching-on operation after the product runs for many years is ensured.

The invention relates to the field of transformer substation pressing plates, in particular to a wire spring type duplex remote control pressing plate which comprises a remote control executing mechanism and a duplex pressing plate body, the remote control executing mechanism is connected with the duplex pressing plate body, and a push-out mechanism and a rotating mechanism are arranged in the remote control executing mechanism; the push-out mechanism is connected with a rotating shaft disconnecting link penetrating through the duplex pressing plate body through a propeller, and the outer side of the propeller is connected with a rotating mechanism, so that the rotating shaft disconnecting link can stretch out, draw back and rotate on the duplex pressing plate body. The duplex pressing plate body is provided with a double electrical connection loop, the double electrical connection loop is provided with at least a first pair of wire spring plugs and a second pair of wire spring plugs, the first pair of wire spring plugs and the second pair of wire spring plugs do not interfere with each other, and the first pair of wire spring plugs is used for controlling the on-off state of the duplex pressing plate body. The second alignment spring plug is used for feeding back the switching state of the duplex pressing plate body to the background in real time; and the rotating shaft disconnecting link is provided with at least two first electrodes and second electrodes which are not interfered with each other.

The utility model provides a GIS double grounding isolation knife switch, including base, mounting post, support device, support insulator, conductive system, grounding system, transmission system and operating mechanism, the base is equipped with the mounting post, the mounting post is equipped with the support device, the support device includes the support table and support rib plate, the support rib plate is equipped with the support insulator, the conductive system, the grounding system, the transmission system and the operating mechanism. The supporting rib plate is installed at the bottom of the supporting table, the supporting insulators are arranged on the two sides of the supporting table, the conductive system is located on the tops of the supporting insulators, and the conductive system is connected with the transmission system; the grounding system is mounted on the mounting column and is connected with the transmission system; the transmission system is located on the right side of the base, and the transmission system is connected with the operating mechanism; the operating mechanism comprises a hydraulic device and a control cabinet, the hydraulic device is arranged on the side face of the base, and the control cabinet is arranged in front of the base.

The utility model provides a one-key sequential control controller. The one-key sequential control controller comprises a shell and a control circuit board, the shell comprises an upper shell body and a lower shell body, screw openings of the fixing screws are arranged on the front face of the upper shell body and the bottom face of the lower shell body, and the upper shell body and the lower shell body are fixed together through the screws. And the control circuit board is arranged in the shell and is used for operating and controlling the circuit breaker, the handcart and the grounding switch. The device has a local operation mode and a remote operation mode, and can automatically complete the operation of the circuit breaker, the handcart and the grounding knife switch according to an input instruction; meanwhile, the switch operation of the switch cabinet is controlled to be in the working state required by the input instruction, such as operation, hot standby, cold standby and maintenance.

This invention discloses a high-current DC disconnect switch, relating to the field of power electronics technology. It includes: a conductive housing with multiple parallel-connected knife switch moving contacts on both sides of the outer surface; multiple connecting rods, each hinged at its large and small ends to the multiple knife switch moving contacts on both sides of the conductive housing; and an operating mechanism assembly, the output end of which is hinged to the connecting rod body, used to drive the connecting rods to swing and synchronously rotate the knife switch moving contacts, causing them to contact or move away from the conductive housing. When the knife switch moving contacts contact the conductive housing, the disconnect switch is on; when the knife switch moving contacts move away from the conductive housing, the disconnect switch is off. This invention achieves synchronous and precise driving of multiple moving contacts, ensuring reliable contact between the moving contacts and the housing frame.

A loop impedance simulation device of the present invention relates to the technical field of loop impedance simulation, and comprises a base, a support is fixedly mounted on the base, a bearing frame is fixedly mounted at the top end of the support, a switching-on mechanism is arranged on the bearing frame, and the switching-on mechanism is composed of an assembling assembly used for assembling a knife switch and an opening and closing assembly used for driving the assembling assembly. An impedance monitoring body is further arranged on the base, the opening and closing assembly comprises a driven gear rotationally connected to the top end of the bearing frame, a rotating shaft seat is fixedly installed on the bearing frame, an arc-shaped receding groove is formed in the end, close to the driven gear, of the rotating shaft seat, and an arc-shaped gear ring driven by a servo motor is further arranged on a rotating shaft in the rotating shaft seat. The switch blade is driven to be opened and closed through a pure mechanical part, and a meshing structure of the arc-shaped gear ring and the driven gear is matched, so that the motion process of the switch blade is stable without offset, the problem of opening failure caused by high temperature of a traditional relay is avoided, and the continuity and reliability of loop impedance simulation are improved.

The utility model relates to an isolation switch of a vacuum circuit breaker, which comprises two switch blades, the outer sides of the front ends of the two switch blades are respectively provided with a reinforcing clamping plate, the front ends of the reinforcing clamping plates protrude out of the front ends of the switch blades, and the rear ends of the two reinforcing clamping plates are provided with first bolt pairs penetrating through the two switch blades in a penetrating manner. A first spring is arranged on a first bolt of the first bolt pair in a penetrating mode, a second bolt pair is arranged at the front ends of the two reinforcing clamping plates in a penetrating mode, and a second spring is arranged on a second bolt of the second bolt pair in a penetrating mode. According to the isolating knife switch of the vacuum circuit breaker, the balance of clamping force in front of and behind the contact point of the knife switch and the static contact is enhanced through the effect of the reinforcing clamping plate, so that the knife switch and the static contact are more stably kept to be jointed, and the performance requirement of dynamic thermal stability of the vacuum circuit breaker is met.

The application relates to an AC disconnecting switch, in particular to the field of power equipment, which comprises a chassis, the chassis is provided with first and second support insulators, and static and dynamic side terminal boards are respectively arranged, the static side terminal board is provided with a conductive knife switch, the application further comprises a contact-free opening device, which comprises a clamping column connected with the conductive knife switch and provided with a first permanent magnet, a fixing sleeve sleeved on the dynamic side terminal board, a second permanent magnet repelling the first permanent magnet, a knife collecting column connected with the static side terminal board and the like, and a plurality of auxiliary structures such as a rotating sleeve, a positioning structure, a clamping structure, a buffering structure, a knife clamping structure, a locking structure and the like are arranged. The application achieves the technical effects that the contact-free opening of the AC disconnecting switch is realized, the operation safety and stability are improved, the conductive knife switch can be effectively stored, and the opening state of the conductive knife switch is stable and reliable.

The utility model discloses a closing anti-drop device of a switch box, and relates to the technical field of switch boxes, the closing anti-drop device comprises a box body, a side door and a knife switch body, the top of the left front side of the inner cavity of the box body is detachably provided with an insulating base, and the top of the right side of the insulating base is detachably provided with a plurality of upper clamping seats; a plurality of lower clamping seats are detachably mounted on the bottom plate on the right side of the insulating base; a knife switch body is detachably mounted in the middle of each lower clamping seat; according to the utility model, through cooperative use of the metal sheet structure and the elastic sheet structure, during use, the knife switch body and the metal sheet in an initial state can conveniently extend into the middle inner cavity of the upper clamping seat by utilizing the rear side arc-shaped design of the middle part of the right side of the upper clamping seat, so that the knife switch body is in a closed state; the knife switch and the metal sheet which extend into the middle of the upper clamping seat are prevented from being easily separated from the upper clamping seat, the problem that the knife switch trips due to vibration or external connection accidents is solved, and the effect of improving closing and falling prevention when the switch box is used is achieved.

1. Name of the product in this design: Single-throw knife switch. 2. Purpose of this design: For controlling switches. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

A high-voltage switchgear anti-lock grounding switch, belonging to the technical field of high-voltage switchgear equipment, is used to prevent the switch from locking up during grounding of high-voltage switchgear. The technical solution is as follows: the lower end of the insulator is fixed to the upper surface of the base, the upper end of the insulator is connected to one end of a connecting plate, and the other end of the connecting plate is connected to a stationary contact. A base plate is fixedly connected to one side of the base. The lower end of the switch rod is fixedly connected to the base plate via a rotating shaft and a switch rod support plate. The upper end of the switch rod is connected to a moving contact frame. Two moving contacts are placed parallel to each other within the moving contact frame. Springs on the top and bottom inner surfaces of the moving contact frame press against the outer ends of the two moving contacts, clamping the two moving contacts to both sides of the stationary contact. A push rod is located on the top surface of the moving contact frame, and a handle is fixed to the upper end of the push rod. This invention can prevent the switch from locking up, improve the connection effect between the moving and stationary contacts, prevent accidental opening of the switch due to loosening, and improve the reliability of grounding.

1. The name of the design product: knife switch state monitoring device. 2. The use of the design product: the design product is mainly used in the power anti-misoperation system to monitor the state of the knife switch. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: use state diagram. 5. Other components that need to be explained: the design product is a combination product including components 1-2. Component 1 is a permanent magnet installed on the moving mechanism of the equipment. Component 2 is installed beside the moving mechanism of the equipment. Components 1 and 2 are used in combination to sense the state of the moving equipment by magnetic induction.

The utility model discloses extrusion equipment for recycling non-ferrous metals, which relates to the technical field of non-ferrous metal processing and comprises a machine body and a storage hopper fixedly connected to the upper surface of the machine body, extrusion mechanisms are arranged inside and outside the machine body, and each extrusion mechanism comprises a hydraulic machine mounted on the outer surface of the right side of the machine body. The output end of the hydraulic machine is fixedly connected with an L-shaped pressing plate, a groove seat is fixedly connected to the interior of the machine body, the L-shaped pressing plate is slidably connected to the interior of the groove seat, the lower surface of the groove seat penetrates through the upper surface to be slidably connected with a discharging seat, the upper surface of the discharging seat is fixedly connected with a sealing plate, and the surface of one side of the sealing plate is designed to be a knife switch. And a transmission mechanism is arranged outside the discharging seat. Compared with existing common extrusion equipment for non-ferrous metal recovery, the extrusion equipment for non-ferrous metal recovery has the advantages that a large number of crushed non-ferrous metal materials can be temporarily stored in the storage hopper, continuous extrusion and material pushing operation can be achieved, and the extrusion efficiency is improved.

The utility model discloses an electric power overhaul safety protection clamp which comprises channel steel used for installing an isolation knife switch and a vertical plate arranged on the rear side of the closed end of the channel steel, the rear side of the vertical plate is fixedly connected with a vertical rod extending upwards, and the top end of the vertical rod is fixedly connected with a hanging lug used for hanging a safety rope. An upper clamp and a lower clamp are respectively arranged on the front side of the vertical plate and are locked on the upper side and the lower side of the channel steel through locking pieces. The safety rope can be hung at a high position and used at a low position, the standard of maintenance operation is met, the personal safety of maintenance personnel is guaranteed, installation is convenient, and fixation is firm.

This utility model relates to the field of overvoltage protection devices and discloses an overvoltage protection device with a disconnection device. It includes a base, with insulators at both ends of the upper surface of the base. A mounting base is fixedly connected to the upper surface of the insulator on the right side, and a gate seat is fixedly connected to the upper surface of the insulator on the left side. A knife switch is hinged to the outer wall of the mounting base. A disconnection mechanism is provided on the inner surface of the base, and a switch assembly is provided on the upper surface of the base. The disconnection mechanism includes a positioning component, which includes a rotating rod. In this utility model, the positioning component of the disconnection mechanism, in cooperation with the engaging component, allows for manual disconnection of the gate seat and the knife switch. Furthermore, the locking groove and locking block prevent accidental opening and closing, ensuring stable connection between the knife switch and the gate seat during use and ensuring safe circuit disconnection during maintenance, avoiding reconnection due to external force, thus improving operational convenience and safety.

The utility model belongs to the field of knife switch interlocking, especially is involved in a kind of knife switch interlocking device, it includes base, knife switch seat, knife switch stem, carousel, first sliding frame, second sliding frame, gear wheel is connected on the carousel with the corresponding side of first sliding frame, and the carousel with the corresponding side of second sliding frame is connected with the lever, second sliding frame is also equipped with the drive mechanism for driving lever in it, rack plate is slidably connected in first sliding frame with gear wheel engagement, the both ends inner wall of first sliding frame are correspondingly provided with limit slot, each limit slot is slidably connected with contact switch in it, and contact switch and the inner wall of limit slot are connected with spring between it. The device can control knife switch conveniently, and can accurately monitor its on-off state, and has the characteristics of stable use.

The present application relates to a mechanical lock device of a three-phase linkage disconnecting switch, which is part of the three-phase linkage disconnecting switch further comprising a base, three movable contact holders, three static contact holders, three knife switch assemblies, three connecting rod devices, a plurality of support insulators, a transmission shaft device, a self-locking spring, an operating handle and an anti-unhooking device. When not in operation, the mechanical lock working assembly is embedded in the base and circumferentially fixes the transmission shaft device, thereby locking the transmission shaft device and avoiding mis-tripping or mis-closing. The anti-unhooking device is installed on the knife switch assembly and is in transmission connection with the connecting rod device. The anti-unhooking device is detachably embedded in the movable contact holder under the traction of the connecting rod device. When the anti-unhooking device is embedded in the movable contact holder, the knife switch assembly is locked, so that even if the self-locking spring fails, the knife switch assembly can be reliably fixed to avoid mis-tripping.

The invention discloses a microcomputer anti-misuse quick-open lock, and relates to the technical field of microcomputer anti-misuse locks.The microcomputer anti-misuse quick-open lock comprises a connecting plate, an electric brake base is fixedly connected to one side of the connecting plate, a knife switch is rotationally connected into the electric brake base, an electronic lock is arranged on one side of the knife switch, and one side of the electronic lock is fixed to the connecting plate; a primary limiting mechanism used for limiting the knife switch is arranged in the electronic lock. According to the microcomputer misuse-preventing quick-opening type lock, through cooperation of three structures of double anti-error limiting, multi-specification adaptive installation and intelligent slot protection, the problems that a traditional lock is poor in anti-error effect and low in adaptability, and sundries are prone to entering a slot are solved, key authorization and holding unlocking are needed for double limiting, mistaken touch is eradicated, the clamping and limiting structures can be adjusted to be adaptive to different knife switches, and the safety of the lock is improved. The rubber roller is linked with the shielding plate to achieve slot dust prevention and key protection, the three structures give consideration to operation safety, installation flexibility and component protection, and the overall reliability of locking is improved.

The invention provides a mother switching method and device, electronic equipment, a storage medium and a program product. The method comprises the steps that a bus switching instruction is responded, a disconnecting link on the side of a first bus is controlled to be switched on, and the bus switching instruction is used for indicating that a power load is transferred from a second bus to a first bus; acquiring current data and voltage data of the first bus side; according to the current data and the voltage data, whether bus switching succeeds is judged; and based on the judgment result, opening or locking a disconnecting link on the second bus side. The method is used for achieving the effect of improving the reliability and safety of the inverted bus.

The utility model relates to the technical field of power distribution boxes, in particular to a power distribution box convenient to install, which comprises a box body and an installation plate combination, the box body is provided with a knife switch cavity, the installation plate combination is located in the knife switch cavity, and the installation plate combination comprises a first installation plate, a second installation plate and a third installation plate and is provided with a strip-shaped groove in the length direction. The first mounting plate is provided with a knife switch, the second mounting plate is provided with a metering transformer, the third mounting plate is provided with an N-phase copper bar, the first mounting plate and the second mounting plate are both provided with first through holes, the third mounting plate is provided with second through holes, and the two side walls of the knife switch cavity are both provided with U-shaped power strips provided with third through holes. Two ends of the first mounting plate and two ends of the second mounting plate are respectively connected with the two U-shaped power strips, one end of the third mounting plate is connected with one U-shaped power strip, the plurality of third through holes are arranged on the U-shaped power strips, and the strip-shaped grooves are arranged on the first mounting plate, the second mounting plate and the third mounting plate, so that the advantages of better universality and convenience in mounting are realized.

A hard connecting rod type knife switch anti-misoperation locking mechanism is arranged between a knife switch and a grounding knife switch to enable the knife switch and the grounding knife switch not to be in a closing position at the same time and comprises two execution units, one execution unit is arranged on a main shaft of the knife switch, and the other execution unit is arranged on a main shaft of the grounding knife switch. An interlocking rod is fixedly connected between the two execution units, and linkage is achieved through the interlocking rod. When one execution unit rotates to a closing position along with the main shaft, the other execution unit is in a locking state under the action of the interlocking rod, so that the main shaft where the execution unit is located cannot rotate.

The utility model belongs to switch device technical field discloses a kind of vacuum shunt switch device and switch equipment. Vacuum shunt switch device includes isolating contact, vacuum arc-extinguishing mechanism, transmission mechanism and isolating knife switch. Transmission mechanism includes transmission assembly, rotating member and elastic member. The process of isolating knife switch rotates along first rotation direction is rotated by driving rotating member to drive transmission assembly to rotate, make transmission assembly drive moving contact and static contact separate, after moving contact and static contact complete separation, rotating member keeps and limit support arm abut under the action of elastic member;The process of isolating knife switch rotates along second rotation direction is rotated by driving rotating member to drive transmission assembly to rotate, make transmission assembly drive moving contact and static contact gradually engage to complete closing, and before moving contact and static contact engage, isolating knife switch has been engaged with isolating contact. The opening and closing operation safety of the vacuum shunt switch device is better.

The invention relates to the technical field of rail transit, and discloses a fault analysis method for an isolation switch of a rail transit overhead line system and related equipment. A data acquisition module arranged on an isolation knife switch acquires the position state, the air switch state, the opening angle, the closing angle, the motor current, the opening time, the opening time and the contact temperature in the closing process of the isolation knife switch in real time, and then fault reason analysis or fault prediction is performed according to real-time action data of the isolation knife switch. During fault reason analysis, judgment is carried out based on the collected action data and logic judgment rules of different fault reasons so as to determine the fault reasons; during fault prediction, the prediction is realized by analyzing the change trend of the collected action data; the problem that an existing isolation switch fault analysis scheme is low in analysis efficiency and accuracy is solved.

1. The name of the design product: knife switch position auxiliary judgment tool (220kV GIS). 2. The use of the design product: used for auxiliary judgment of knife switch opening and closing in place in 220kV GIS hot busbar operation, to ensure operation safety and power grid stability. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.