Large-current isolating switch contact assembly

Abstract

The invention discloses a large-current isolating switch contact assembly, and belongs to the technical field of power equipment. The isolating switch contact assembly comprises a static contact and a moving contact. The moving contact comprises a first conductive tube, a water drop arc-shaped convex surface contact and a contact seat; the water drop arc-shaped convex surface contacts are connected with the contact seat, and the torsion springs are fixed on the supporting piece and connected with the tail ends of the water drop arc-shaped convex surface contacts on the two sides respectively; the static contact comprises a second conductive tube and a water drop arc-shaped concave surface contact finger; the water drop arc-shaped concave surface contact finger is connected with the contact finger seat, the contact surfaces of the water drop arc-shaped concave surface contact finger and the water drop arc-shaped convex surface contact are water drop arcs with the same size, the pressure sensors are respectively fixed at the tail ends of the two sides of the rain cover, and the pressure sensors are connected with the contact finger tail ends of the two sides of the water drop arc-shaped concave surface contact finger through compression springs; the conductive capacity of the disconnecting switch can be improved, through-flow heating of the spring is avoided, and the switching-on and switching-off states of the disconnecting switch can be judged more effectively.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, and in particular to a high-current isolating switch contact assembly. Background Art

[0002] Disconnector is a switchgear without arc extinguishing function. It is one of the most important components in the power system. It is mainly divided into four parts: conduction, insulation, transmission and operation. Among them, the conductive part is the core component of the disconnector, and its structure directly affects the performance of the disconnector. When the disconnector is in operation, the contact fingers move with the conductive arm to realize the disconnection or closing of the circuit. In actual operation, the contact fingers often heat up or even burn out. The main reason is that the contact area between the contact and the finger is small, the conductive capacity is insufficient, and the current carrying capacity of the disconnector is limited. In the prior art, the contact fingers are mostly arranged in pairs, and the contacts are clamped in a straight line. If the capacity and contact area are to be increased, the number of contact fingers and the length of the contacts must be increased, that is, the length of the straight line must be increased. The increase in length will reduce the safe distance between the contact fingers and the ground. If the safe distance to the ground is to be guaranteed, the length of the insulator must be increased, thereby greatly increasing the manufacturing cost of the disconnector.

[0003] At the same time, when the isolating switch is in the closed position, it must ensure good contact and be able to carry the current under normal operating conditions and the current under abnormal conditions within the specified time. When the isolating switch is in the open position, there is an insulation distance required by the load regulations and an obvious disconnection mark between the contacts to establish a reliable insulation gap. If the isolating switch is not closed in place, it will cause heating and discharge failures, posing a serious threat to the lives of maintenance personnel and the safety of power grid equipment.

[0004] Moreover, in the prior art, no insulation measures are taken between the spring and the static contact assembly or measures are taken but damaged, which will cause current to flow through the spring, causing the spring to anneal, lose elasticity or even break, resulting in poor contact between the static contact assembly and the moving contact assembly and heat. The spring will fatigue when it is in a compressed or tensioned working state for a long time, and will slowly lose elasticity as the running time increases, and may even produce permanent deformation, resulting in poor contact of the contacts, welding, etc., directly affecting the reliability and safety of the power supply of the power system. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a contact assembly for a large current isolating switch, which greatly improves the conductive capacity, reduces the heat generation of the contact assembly, avoids the failure of the compression spring due to current flow and heat generation, and more effectively determines the open and closed positions of the isolating switch, breaking through the bottleneck that the contact area of ​​the isolating switch contact assembly is small and the conductive capacity is difficult to improve.

[0006] The present invention adopts the following technical solution:

[0007] A contact assembly of a large current isolating switch, comprising: a stationary contact and a moving contact; the moving contact comprises: a first conductive tube, a water drop arc convex contact and a contact seat; the water drop arc convex contact is connected to the contact seat, one end of the contact seat is connected to the first conductive tube, the other end of the contact seat is provided with a support, a torsion spring is fixed on the support and respectively connected to the ends of the water drop arc convex contacts on both sides; the stationary contact comprises: a second conductive tube and a water drop arc concave contact finger; the water drop arc concave contact finger is connected to the contact finger seat, the other end of the contact finger seat is connected to the second conductive tube, ... The contact surface between the finger and the water-drop arc convex contact is a water-drop arc of the same size, the end of the contact finger seat away from the water-drop arc convex contact is fixedly connected to the rain cover, the pressure sensors are respectively fixed at the ends of both sides of the rain cover, and the pressure sensors are connected to the ends of the contact fingers on both sides of the water-drop arc concave contact finger through compression springs; the water-drop arc convex contact and the water-drop arc concave contact finger can be completely fitted when closing the switch, the curvature of the arc of the water-drop arc convex contact slowly increases from the contact seat to the end away from the contact seat, and the angle between the arc tangent and the plane where the contact seat is located gradually decreases from an obtuse angle to zero.

[0008] According to the described high current isolating switch contact assembly, the water drop arc concave contact finger is one or more strip water drop arc concave contact fingers arranged in parallel with the same spacing, and the strip water drop arc concave contact fingers are fixed to both sides of the contact finger seat with bolts; the water drop arc convex contact is a whole composed of a pair of symmetrically arranged water drop arc convex contact pieces with the same water drop shape, and the water drop arc convex contact pieces are fixed to both sides of the contact seat.

[0009] According to the contact assembly of a large current isolating switch, the torsion spring provides forces F1 and F2 perpendicular to the torsion arm toward the outside of the contacts on both sides; the compression spring provides forces F3 and F4 perpendicular to the ends of the contact fingers toward the inside.

[0010] According to the described high current isolating switch contact assembly, when opening the switch, the water drop arc convex contact is subjected to pressures F5 and F6 perpendicular to the contact surfaces of the water drop arc convex contact and the water drop arc concave contact, and the proportion of the forces F51 and F61 of F5 and F6 in the direction parallel to the tangent plane of the contact surface is much smaller than the force in the direction perpendicular to the tangent plane of the contact surface.

[0011] According to the large current isolating switch contact assembly, the current flow path I3 during the closing operation does not pass through the compression spring and the torsion spring.

[0012] According to the described high current isolating switch contact assembly, the pressure sensor has a battery module, a pressure measurement module, a processor module and a wireless transmission module inside, which can continuously measure the pressure of the contact compression spring in the isolating switch, and the processor records the pressure value measured at each moment.

[0013] According to the high-current isolating switch contact assembly, the processor module, the pressure measurement module and the wireless transmission module in the pressure sensor are connected to the battery module.

[0014] According to the large current isolating switch contact assembly, when the pressure value gradually rises and then falls, and the pressure value after stabilization is within the set closing judgment value F 合 When the pressure value is within the range of ±10%, the isolating switch can be judged as closed; when the stable pressure value is within the set opening judgment value F 分 When the disconnector is within the range of ±10%, it can be judged that the disconnector is in open position.

[0015] According to the large current isolating switch contact assembly, the wireless transmission module of the pressure sensor sends the opening and closing judgment result of the isolating switch to the power grid measurement and control system for judging the opening and closing status of the isolating switch.

[0016] According to the high current isolating switch contact assembly, a layer of memory metal spring pad is provided between the bolt and the contact seat.

[0017] Compared with the prior art, the beneficial effects of the present invention include at least:

[0018] By providing a convex contact and a concave contact finger assembly with the same contact surface size as a water drop arc, the contact area between the contact and the contact finger of the isolating switch is greatly increased, thereby increasing the conductive capacity of the isolating switch, reducing the manufacturing cost and the heat generated during the operation of the isolating switch; pressure sensors are respectively fixed to the ends of both sides of the rain cover and connected to the ends of the contact fingers on both sides of the contact finger seat through compression springs. When closing the switch, a torsion spring is provided to make the current flow path away from the position of the compression spring, thereby avoiding the failure of the compression spring due to current flow and heating, and can more effectively control the opening and closing positions of the isolating switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of a conventional isolating switch contact assembly in the prior art;

[0020] Figure 2 This is a cross-sectional view of a high current isolating switch contact assembly proposed in the first embodiment;

[0021] Figure 3 This is a cross-sectional view of a high current isolating switch contact assembly proposed in the second embodiment;

[0022] Figure 4 This is a cross-sectional view of a high current isolating switch contact assembly proposed in the third embodiment;

[0023] Figure 5 A three-dimensional diagram of a stationary contact in a contact assembly of a high-current isolating switch proposed in the first embodiment;

[0024] Figure 6 A three-dimensional diagram of a moving contact in a contact assembly of a high-current isolating switch proposed in the first embodiment;

[0025] Figure 7 A three-dimensional diagram of a moving contact in a current isolating switch contact assembly having memory metal proposed in the third embodiment;

[0026] Figure 8 A three-dimensional diagram of a straight torsion spring in a contact assembly of a high-current isolating switch proposed in the first embodiment;

[0027] Fig. 9 A three-dimensional diagram of an angular torsion spring in a contact assembly of a high-current isolating switch proposed in the second embodiment;

[0028] Fig.10 It is a conventional technology, and is a schematic diagram of the current flow path when the conventional isolating switch contact assembly is working;

[0029] Fig.11 This is a schematic diagram of the current flow path of a high current isolating switch contact assembly when it is working, as proposed in the first embodiment;

[0030] Fig.12 A schematic diagram of the current flow path of a high current isolating switch contact assembly when working, as proposed in the second embodiment;

[0031] Fig.13 A schematic diagram of the current flow path of a high current isolating switch contact assembly when in operation, as proposed in the third embodiment;

[0032] Fig.14 This is a schematic diagram of the spring force of a high current isolating switch contact assembly in a closed state proposed in the first embodiment;

[0033] Fig.15 This is a schematic diagram of the spring force of a high current isolating switch contact assembly in a closed state proposed in the second embodiment;

[0034] Fig.16 A schematic diagram of the force on the contacts of a high current isolating switch contact assembly when the switch is opened, as proposed in the first embodiment;

[0035] Fig.17 This is a schematic diagram of the force on the contacts of a high-current isolating switch contact assembly when the contact assembly is closed, as proposed in the first embodiment;

[0036] Fig.18 A schematic diagram of the force applied to the compression spring during the opening and closing process of a contact assembly of a high-current isolating switch proposed in the first embodiment;

[0037] Figure numerals: 1. first conductive tube; 2. contact seat; 3. water drop arc concave contact finger; 31. traditional straight contact finger; 4. compression spring; 5. pressure sensor; 6. second conductive tube; 7. bolt; 8. contact finger seat; 9. water drop arc convex contact; 91. traditional block contact; 10. rain cover; 11. support member; 12. straight torsion spring; 13. angular torsion spring; 14. memory metal spring pad; 301. first strip-shaped water drop arc concave contact finger; 302. second strip-shaped water drop arc concave contact finger; 303. third strip-shaped water drop arc concave contact finger; 304. fourth strip-shaped water drop arc concave contact finger; 305. fifth strip-shaped water drop arc concave contact finger; 306. sixth strip-shaped water drop arc concave contact finger; 901. first water drop arc convex contact sheet; 902. second water drop arc convex contact sheet. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of the present invention.

[0039] like Figure 2-18 As shown, the present application provides a high-current isolating switch contact assembly, which greatly improves the conductive capacity, reduces the heat generation of the contact assembly, avoids the failure of the compression spring due to heat generation, and more effectively determines the open and closed positions of the isolating switch, breaking through the bottleneck that the contact area of ​​the isolating switch contact assembly is small and the conductive capacity is difficult to improve.

[0040] Embodiment 1:

[0041] like Figure 2As shown, the present invention provides a contact assembly of a large current isolating switch, comprising: a moving contact and a stationary contact. The moving contact comprises: a first conductive tube 1 and a water drop arc convex contact 9; one end of a contact seat 2 is connected to the first conductive tube 1, and the other end of the contact seat 2 is provided with a support member 11, the water drop arc convex contact 9 is connected to the contact seat 2 through a bolt 7, and a straight torsion spring 12 is fixed on the support member 11 to respectively connect the ends of the water drop arc convex contacts 9 on both sides and the bolts 7 on the contact seat 2. The static contact includes: a second conductive tube 6 and a water drop arc concave contact finger 3; the water drop arc concave contact finger 3 is connected to the contact finger seat 8 by a bolt 7, and the other end of the contact finger seat 8 is connected to the second conductive tube 6, and the contact surface between the water drop arc concave contact finger 3 and the water drop arc convex contact 9 is a water drop arc of the same size, and one end of the contact finger seat 8 away from the water drop arc convex contact 9 is fixedly connected to the rain cover 10, and the pressure sensor 5 is respectively fixed on the inner side of the ends of both sides of the rain cover 10, and the surface is insulated, and the pressure sensor 5 is connected to the contact finger ends on both sides of the water drop arc concave contact finger 3 through a compression spring 4.

[0042] The rain cover 10 is in the shape of a rectangular parallelepiped, wraps the contact finger inside, and is fixed to the contact finger by bolts 7; the rain cover 10 is required to have the characteristics of corrosion resistance, high mechanical strength and non-deformation, and is generally made of hot-dip galvanized steel.

[0043] like Figure 2 , Figure 5 or Figure 6As shown, specifically, the water drop arc convex contact 9 and the water drop arc concave contact finger 3 can fit perfectly when the switch is closed, and the manufacturing material has good conductivity, generally copper, and the contact surface is silver-plated. Compared with the traditional block contact 91 and the traditional straight contact finger 31, the contact area of ​​the contact and the contact finger is greatly increased, the contact area is qualitatively increased, and the conductive capacity of the contact assembly is greatly improved, avoiding the contact assembly from heating up during operation. At the same time, the water drop arc concave touch finger 3 is one or more strip-shaped water drop arc concave touch fingers arranged in parallel with the same spacing. In one embodiment, the water drop arc concave touch finger 3 is provided with eight strip-shaped water drop arc concave touch fingers, namely: a first strip-shaped water drop arc concave touch finger 301, a second strip-shaped water drop arc concave touch finger 302, a third strip-shaped water drop arc concave touch finger 303, a fourth strip-shaped water drop arc concave touch finger 304, a fifth strip-shaped water drop arc concave touch finger 305, a sixth strip-shaped water drop arc concave touch finger 306, a seventh strip-shaped water drop arc concave touch finger 307, and a And the eighth strip-shaped water drop arc concave contact finger, the strip-shaped water drop arc concave contact finger is fixed on both sides of the contact finger seat 8 with bolts 7; the water drop arc convex contact 9 is a whole composed of a pair of symmetrically arranged water drop arc convex contact pieces with the same water drop shape, namely: a first water drop arc convex contact piece 901, a second water drop arc convex contact piece 902; the water drop arc convex contact pieces are fixed on both sides of the contact seat 2, and compared with the traditional block contact 91 and the traditional straight contact finger 31, it can achieve a more effective fit with the water drop arc convex contact 9, and the more the number, the stronger the flow capacity.

[0044] The sizes and shapes of the plurality of strip-shaped water drop arc-shaped concave tentacles are the same, and the maximum concave depth of the strip-shaped water drop arc-shaped concave tentacles is 0.5 to 1 cm.

[0045] like Fig.14 As shown, the straight torsion spring 12 fixed on the support 11 and connected to the ends of the water drop arc convex contact 9 on both sides and the bolt 7 on the contact seat 2 respectively provides forces F1 and F2 perpendicular to the torsion arm to the outside of the contacts on both sides; the compression spring 4 fixed on the ends of the rain cover 10 on both sides and connected to the ends of the contact fingers on both sides of the contact finger seat 8 through the compression spring 4 provides forces F3 and F4 perpendicular to the ends of the contact fingers to the inside. F1, F2 and F3, F4 can provide surface pressure of the water drop arc convex contact 9 and the water drop arc concave contact finger 3 during operation. Compared with the traditional contact assembly, which only provides pressure with the compression spring 4, the contact of the closing switch is more stable.

[0046] At the same time, the curvature of the arc of the water drop arc convex contact 9 increases slowly from the contact seat 2 to the end away from the contact seat 2, and the angle between the arc tangent and the plane where the contact seat 2 is located gradually decreases from an obtuse angle to zero.

[0047] like Fig.16As shown, when opening the gate, the water drop arc convex contact 9 is subjected to pressures F5 and F6 perpendicular to the contact surface between the water drop arc convex contact 9 and the water drop arc concave contact finger 3. The proportion of forces F51 and F61 of F5 and F6 in the direction parallel to the tangent plane of the contact surface is much smaller than the force in the direction perpendicular to the tangent plane of the contact surface, so the influence on the opening process can be ignored; the depression depth of the water drop arc concave contact finger 3 does not exceed 0.5 to 1.0 cm, which can greatly reduce the deformation of the compression spring 4 during the opening process, thereby reducing F5 and F6, and further reducing the friction during the opening process.

[0048] like Fig.17 As shown, when closing the switch, the water drop arc convex contact 9 is subjected to pressures F7 and F8 perpendicular to the contact surface between the water drop arc convex contact 9 and the water drop arc concave contact finger 3, thereby avoiding the problem of excessive insertion depth during the closing process.

[0049] like Fig.11 As shown, the current flow path I3 of a large current isolating switch contact assembly during closing operation does not pass through the compression spring 4 and the straight torsion spring 12. Fig.10 The current I1 of the conventional isolating switch contact assembly during closing operation avoids the situation where the compression spring 4 is not insulated or is damaged after measures are taken, and the current I2 flows through the compression spring 4, causing the compression spring 4 to heat up and fail.

[0050] In this embodiment, the pressure sensor 5 fixed at the ends of both sides of the rain cover 10 is connected to the ends of the contacts on both sides of the contact base 8 through the compression spring 4. The pressure sensor 5 has a battery module, a pressure measurement module, a processor module and a wireless transmission module inside. The pressure sensor 5 can continuously measure the pressure of the contact compression spring 4 in the isolating switch, and the processor records the pressure value measured at each moment.

[0051] The processor module, the pressure measurement module and the wireless transmission module in the pressure sensor 5 are connected to the battery module.

[0052] like Fig.18 As shown in the figure, when the pressure value gradually rises and then drops, and the stable pressure value is within the set closing judgment value F 合 When the pressure value is within the range of ±10%, the isolating switch can be judged as closed; when the stable pressure value is within the set opening judgment value F 分 When the pressure is within the range of ±10%, the isolating switch can be judged to be in the open position. The wireless transmission module of the pressure sensor 5 sends the judgment result of the opening and closing of the isolating switch to the power grid measurement and control system, effectively judging the opening and closing status of the isolating switch.

[0053] Embodiment 2

[0054] like Figure 3As shown, the angular torsion spring 13 can also be fixed on the support member 11 and only connect the ends of the water drop arc convex surface contacts 9 on both sides. Fig.15 As shown, the angular torsion spring 13 fixed on the support 11 and connected to the ends of the water drop arc convex contacts 9 on both sides respectively provides forces F1 and F2 perpendicular to the torsion arm toward the outside of the contacts on both sides.

[0055] Embodiment 3

[0056] like Figure 4 As shown, the moving contact includes: a first conductive tube 1 and a water drop arc convex contact 9 connected to both sides of the contact base 2 by bolts 7 through a memory metal spring washer 14, and an angular torsion spring 13 is fixed on the support member 11 and respectively connected to the ends of the water drop arc convex contacts 9 on both sides.

[0057] like Fig.15 As shown, the angular torsion spring 13 fixed on the support 11 and connected to the ends of the water drop arc convex contacts 9 on both sides respectively provides forces F1 and F2 perpendicular to the torsion arm toward the outside of the contacts on both sides.

[0058] like Fig.13 As shown, the current flow path I5 of a large current isolating switch contact assembly during closing operation does not pass through the compression spring 4 and the angular torsion spring 13. Fig.10 The current I1 of the conventional isolating switch contact assembly during the closing operation avoids the situation where the compression spring 4 is not insulated or has been damaged, and the current I2 flows through the compression spring 4, causing the compression spring 4 to heat up and fail. In addition, when the compression spring 4 fails due to heat, the contact assembly heats up, and the memory metal spring pad 14 recovers its deformation due to heat, increasing the elastic force required for the closing operation, and negative feedback reduces the heating of the contact.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A high current isolating switch contact assembly, comprising: Static contact and moving contact; characterized in that: The movable contact comprises: a first conductive tube (1), a water drop arc convex contact (9) and a contact seat (2); the water drop arc convex contact (9) is connected to the contact seat (2); one end of the contact seat (2) is connected to the first conductive tube (1); the other end of the contact seat (2) is provided with a support member (11); a torsion spring is fixed on the support member (11) and is respectively connected to the ends of the water drop arc convex contacts (9) on both sides; The stationary contact comprises: a second conductive tube (6) and a water drop arc concave contact finger (3); the water drop arc concave contact finger (3) is connected to a contact finger seat (8), the other end of the contact finger seat (8) is connected to the second conductive tube (6), the contact surface between the water drop arc concave contact finger (3) and the water drop arc convex contact (9) is a water drop arc of the same size, one end of the contact finger seat (8) away from the water drop arc convex contact (9) is fixedly connected to a rain cover (10), the pressure sensor (5) is respectively fixed to the ends of both sides of the rain cover (10), and the pressure sensor (5) is connected to the ends of the contact fingers on both sides of the water drop arc concave contact finger (3) through a compression spring (4); The water drop arc convex contact (9) and the water drop arc concave contact finger (3) can completely fit together when the switch is closed, and the curvature of the arc of the water drop arc convex contact (9) gradually increases from the contact seat (2) to the end away from the contact seat (2), and the angle between the arc tangent and the plane where the contact seat (2) is located gradually decreases from an obtuse angle to zero.

2. A high current isolating switch contact assembly according to claim 1, characterized in that: The water drop arc concave contact finger (3) is one or more strip-shaped water drop arc concave contact fingers arranged in parallel with the same spacing, and the strip-shaped water drop arc concave contact fingers are fixed to both sides of the contact finger seat (8) by bolts (7); The water drop arc convex contact (9) is a whole formed by a pair of symmetrically arranged water drop arc convex contact pieces having the same water drop shape, and the water drop arc convex contact pieces are fixed on both sides of the contact seat (2).

3. A high current isolating switch contact assembly according to claim 1, characterized in that: The torsion spring provides forces F1 and F2 perpendicular to the torsion arm toward the outside of the contacts on both sides; The compression spring (4) provides forces F3, F4 perpendicular to the end of the stylus finger towards the inside.

4. A high current isolating switch contact assembly according to claim 1 or 3, characterized in that: When the gate is opened, the water drop arc convex contact (9) is subjected to pressures F5 and F6 perpendicular to the contact surface between the water drop arc convex contact (9) and the water drop arc concave contact finger (3), and the proportion of the forces F51 and F61 of F5 and F6 in the direction parallel to the tangent plane of the contact surface is much smaller than the force in the direction perpendicular to the tangent plane of the contact surface.

5. A high current isolating switch contact assembly according to claim 1 or 4, characterized in that: The current flow path I3 during the closing operation does not pass through the compression spring (4) and the torsion spring.

6. A high current isolating switch contact assembly according to claim 1, characterized in that: The pressure sensor (5) has a battery module, a pressure measurement module, a processor module and a wireless transmission module inside, and can continuously measure the pressure of the contact compression spring (4) in the isolating switch, and the processor records the pressure value measured at each moment.

7. A high current isolating switch contact assembly according to claim 6, characterized in that: The processor module, the pressure measurement module and the wireless transmission module in the pressure sensor (5) are connected to the battery module.

8. A high current isolating switch contact assembly according to claim 6, characterized in that: When the pressure value gradually rises, then drops, and the stable pressure value is within the set closing judgment value F 合 When the pressure value is within the range of ±10%, the isolating switch can be judged as closed; when the stable pressure value is within the set opening judgment value F 分 When the disconnector is within the range of ±10%, it can be judged that the disconnector is in open position.

9. A high current isolating switch contact assembly according to claim 8, characterized in that: The wireless transmission module of the pressure sensor (5) sends the opening and closing judgment result of the isolating switch to the power grid measurement and control system for judging the opening and closing state of the isolating switch.

10. A high current isolating switch contact assembly according to claim 1 or 2, characterized in that: A layer of memory metal spring washer (14) is provided between the bolt (7) and the contact seat (2).

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