CN112067981A - Real-time monitoring system for isolating switch - Google Patents
Real-time monitoring system for isolating switch Download PDFInfo
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- CN112067981A CN112067981A CN202010751909.6A CN202010751909A CN112067981A CN 112067981 A CN112067981 A CN 112067981A CN 202010751909 A CN202010751909 A CN 202010751909A CN 112067981 A CN112067981 A CN 112067981A
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- brush
- isolating switch
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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Abstract
The invention discloses a real-time monitoring system of an isolating switch, which comprises a conductive resistance measuring device, wherein the conductive resistance measuring device comprises a first brush-lifting device, a first carbon brush, a second brush-lifting device, a second carbon brush, a conductive resistance measuring loop and a brush-lifting control loop, the first carbon brush and the second carbon brush are respectively arranged at two sides of a moving contact and a fixed contact of the isolating switch, the first brush-lifting device and the second brush-lifting device are respectively used for driving the first carbon brush and the second carbon brush, the first brush-lifting device and the second brush-lifting device are both connected with the brush-lifting control loop, the first carbon brush and the second carbon brush are both connected with the conductive resistance measuring loop, a constant-current power supply is arranged in the conductive resistance measuring loop, and the resistance between the moving contact and the fixed contact is calculated by measuring the voltages at two ends of the moving contact and the fixed. The real-time monitoring system for the isolating switch prevents the unit from operating in a non-full phase mode caused by overheating damage caused by poor contact of the isolating switch, and improves the operation reliability of equipment and the unit.
Description
Technical Field
The invention relates to the technical field of safety monitoring, in particular to a real-time monitoring system for an isolating switch.
Background
In recent years, the generator set is not scheduled to stop operation due to multiple damage events of the high-voltage isolating switch of the generator set. The main reason is that poor contact between the moving contact and the static contact of the isolating switch causes heating, aggravates oxidation damage, if a certain phase is blown, causes the unit to operate in a non-full phase, and if the protection device does not act in time, serious damage accidents of the generator are caused. At present, when the isolating switch is switched on, whether the isolating switch is switched on in place or not is judged through an isolating switch switching-on limit switch and an auxiliary point, and whether the three-phase disconnecting link is in place or not is observed through naked eyes. And the temperature condition of the contact of the disconnecting switch during operation is regularly monitored by an infrared imager. However, these methods are all used for monitoring when the equipment is running, and once an abnormality is detected, most of the equipment is damaged, so that the equipment cannot be prevented from getting ill.
Disclosure of Invention
The invention aims to solve the technical problem of providing a real-time monitoring system for an isolating switch, which is reasonable in design and can monitor the isolating switch before equipment runs.
In order to solve the problems, the invention provides a real-time monitoring system for an isolating switch, which comprises a conductive resistance measuring device, the conductive resistance measuring device comprises a first brush lifting device, a first carbon brush, a second brush lifting device, a second carbon brush, a conductive resistance measuring loop and a brush lifting control loop, the first carbon brush and the second carbon brush are respectively arranged at two sides of a moving contact and a fixed contact of the isolating switch, the first brush-lifting device and the second brush-lifting device are respectively used for driving the first carbon brush and the second carbon brush, the first brush lifting device and the second brush lifting device are both connected with the brush lifting control circuit, the first carbon brush and the second carbon brush are both connected with the conductive resistance measuring circuit, a constant current power supply is arranged in the conductive resistance measuring circuit, and calculating the resistance between the moving contact and the fixed contact by measuring the voltages at the two ends of the moving contact and the fixed contact of the isolating switch.
As a further improvement of the invention, the conductive resistance measuring device further comprises a live monitoring module, the live monitoring module is connected with a main line where the isolating switch is located through a voltage transformer, the brush lifting control loop is connected with the live monitoring module, and when the main line is monitored to be live, the brush lifting control loop controls the brush lifting device to be locked.
As a further improvement of the invention, the device further comprises an accurate alignment device, wherein the accurate alignment device comprises an infrared transmitting device and an infrared receiving device, the infrared transmitting device and the infrared receiving device are respectively arranged on the conducting rods at two sides of the fixed contact and the movable contact, and the fixed contact and the movable contact are guided to be accurately aligned through infrared rays in the rotating process of the movable contact.
As a further improvement of the invention, the isolating switch further comprises a pressure detection device, wherein the pressure detection device comprises a pressure sensor, and the pressure sensor is assembled on a contact finger clamping spring in the isolating switch.
As a further improvement of the invention, the pressure sensor is a wireless pressure sensor, and the pressure sensor transmits pressure data to the on-site receiving device in a wireless manner and then transmits the pressure data to the upper computer through a communication line.
As a further improvement of the invention, the temperature detection device is further included, the temperature detection device comprises a wireless temperature detection sensor, and the wireless temperature detection sensor is fixed on the back surface of the contact finger in the isolating switch.
As a further improvement of the present invention, the temperature detection device further comprises a clamping member, and the wireless temperature detection sensor is fixed on the back surface of the isolating switch finger through the clamping member.
As a further improvement of the invention, a tooth-shaped rubber pad is arranged on the inner side of the clamping head of the clamping piece.
As a further improvement of the invention, heat-dissipation silica gel is coated between the clamping piece and the wireless temperature detection sensor and between the wireless temperature detection sensor and the inner contact finger of the isolating switch.
As a further improvement of the invention, when the disconnecting switch is not switched on, the brush lifting control loop controls the first brush lifting device and the second brush lifting device to be locked.
The invention has the beneficial effects that:
the real-time monitoring system for the isolating switch is provided with the conducting resistance measuring device, so that the conducting resistance between the moving contact and the static contact can be measured before the equipment runs, whether the moving contact and the static contact are in good contact or not is judged, the reliability of connection between the moving contact and the static contact is ensured, the non-full-phase running of a unit caused by overheating damage due to poor contact of the isolating switch is prevented, and the running reliability of the equipment and the unit is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a real-time monitoring system for an isolation switch according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a real-time monitoring system for an isolation switch according to a second embodiment of the present invention.
Description of the labeling: 1. static contact; 2. a moving contact; 3. a conductive rod; 4. a clamping spring; 11. an infrared emitting device; 12. an infrared ray receiving device; 21. a wireless pressure sensor; 31. wireless temperature detection sensor.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As shown in fig. 1, a real-time monitoring system for an isolator in an embodiment of the present invention includes a conductive resistance measuring device, where the conductive resistance measuring device includes a first brush-lifting device, a first carbon brush, a second brush-lifting device, a second carbon brush, a conductive resistance measuring circuit, and a brush-lifting control circuit, the first carbon brush and the second carbon brush are respectively disposed on two sides of a moving contact and a fixed contact of the isolator, the first brush-lifting device and the second brush-lifting device are respectively configured to drive the first carbon brush and the second carbon brush, both the first brush-lifting device and the second brush-lifting device are connected to the brush-lifting control circuit, both the first carbon brush and the second carbon brush are connected to the conductive resistance measuring circuit, a constant current power supply is disposed in the conductive resistance measuring circuit, and a resistance between the moving contact and the fixed contact is calculated by measuring voltages at two ends of the moving contact and the fixed contact of the isolator. Wherein each phase of the three-phase isolating switch is equipped with a conducting resistance measuring device. The conductive resistance measurement circuit and the brush lifting control circuit are integrated in the controller.
When the isolating switch is not switched on, the brush lifting control loop controls the first brush lifting device and the second brush lifting device to be locked. The conductive resistance measuring device further comprises an electrified monitoring module, the electrified monitoring module is connected with a main line where the isolating switch is located through a voltage transformer, the brush lifting control loop is connected with the electrified monitoring module, and when the main line is monitored to be electrified, the brush lifting control loop controls the brush lifting device to be locked.
The conductive resistance measuring device works during the shutdown period of the unit or before the unit is started and connected to the grid, when the isolating switch is switched on and the main circuit is not electrified, the first brush lifting device and the second brush lifting device are controlled through the brush lifting control loop, the first brush lifting device and the second brush lifting device drive the first carbon brush and the second carbon brush to be in contact with the conductive rod, the resistance between the moving contact and the static contact is measured through the conductive resistance measuring loop, and whether the contact between the static contact and the moving contact of the isolating switch is good or not is judged.
As shown in fig. 2, in the second embodiment of the present invention, on the basis of the first embodiment, the system further includes a precise alignment device, the precise alignment device includes an infrared emitting device 11 and an infrared receiving device 12, the infrared emitting device 11 and the infrared receiving device 12 are respectively disposed on the conductive rods 3 at two sides of the fixed contact 1 and the movable contact 2, and the fixed contact 1 and the movable contact 2 are precisely aligned by guiding infrared rays in the rotation process of the movable contact 2. The contact resistance between the moving contact 2 and the fixed contact 1 of the isolating switch is reduced, so that the overall heat productivity of the isolating switch in the operation process is reduced, the damage of equipment is reduced, and the service life is prolonged. Wherein, every looks of three-phase isolator all is equipped with accurate counterpoint device.
Further, the system also comprises a pressure detection device, wherein the pressure detection device comprises a pressure sensor, and the pressure sensor is assembled on the contact finger clamping spring 4 in the isolating switch. The pressure sensor is a wireless pressure sensor 21, pressure data can be transmitted to the local receiving device through the wireless pressure sensor, then the pressure data is uploaded to the upper computer through a communication line, and the operating personnel can monitor the real-time pressure of the local isolating switch on line. Wherein each phase of the three-phase isolating switch is equipped with a pressure detection device.
In one embodiment, the system further comprises a temperature detection device, wherein the temperature detection device comprises a wireless temperature detection sensor 31, and the wireless temperature detection sensor 31 is fixed on the back surface of the contact finger in the isolating switch. Further, the temperature detection device further comprises a clamping piece, the wireless temperature detection sensor 31 is fixed on the back face of the contact finger of the isolating switch through the clamping piece, and a tooth-shaped rubber pad is arranged on the inner side of a clamping head of the clamping piece to play a role in skid resistance and fastening. And heat dissipation silica gel is coated between the clamping piece and the wireless temperature detection sensor 31 and between the wireless temperature detection sensor 31 and the inner contact finger of the isolating switch, so that the heat transfer and fixing effects are achieved.
During the starting-up period of the generator set, the line is not powered, the isolating switch is not switched on, and the accurate alignment device is used for aligning and switching on; the pressure detection device simultaneously detects whether the three-phase pressure is normal; after the disconnecting switch is switched on and the circuit is not powered on, the contact condition of the disconnecting switch can be measured through the conductive resistance detection device, if the disconnecting switch is within the qualified range, the disconnecting switch exits from the conductive resistance detection device, the contact between the moving contact and the static contact of the disconnecting switch is good, and the grid-connected operation can be realized.
When the unit normally operates, the temperature detection device detects the temperatures of the moving contact and the static contact of the three-phase isolating switch, the pressure detection device simultaneously detects the three-phase pressure, and whether the equipment operates well or not is judged according to the condition. If the data deviation condition exists, the machine can be stopped in time to carry out maintenance work, and if the equipment has serious defects, the machine can be reported to be stopped emergently.
After the unit is shut down, the line is powered off, the closing of the isolating switch can be measured through the conductive resistance detection device, whether the moving contact and the static contact of the isolating switch are in good contact or not is judged, and further burning loss phenomena such as pits and pockmarks of the moving contact and the static contact can be found.
The system can detect the state of the isolating switch during startup, operation and maintenance, ensures reliable contact between a moving contact and a fixed contact of the isolating switch, and reduces contact resistance between the moving contact and the fixed contact of the isolating switch, thereby controlling the integral heating degree of the isolating switch in the operation process, prolonging the operation life of the isolating switch, preventing the non-full-phase operation of a unit caused by overheating damage due to poor contact of the isolating switch, and improving the operation reliability of equipment and the unit.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A real-time monitoring system for an isolating switch is characterized by comprising a conductive resistance measuring device, the conductive resistance measuring device comprises a first brush lifting device, a first carbon brush, a second brush lifting device, a second carbon brush, a conductive resistance measuring loop and a brush lifting control loop, the first carbon brush and the second carbon brush are respectively arranged at two sides of a moving contact and a fixed contact of the isolating switch, the first brush-lifting device and the second brush-lifting device are respectively used for driving the first carbon brush and the second carbon brush, the first brush lifting device and the second brush lifting device are both connected with the brush lifting control circuit, the first carbon brush and the second carbon brush are both connected with the conductive resistance measuring circuit, a constant current power supply is arranged in the conductive resistance measuring circuit, and calculating the resistance between the moving contact and the fixed contact by measuring the voltages at the two ends of the moving contact and the fixed contact of the isolating switch.
2. The real-time monitoring system for the isolating switch according to claim 1, wherein the conducting resistance measuring device further comprises a live monitoring module, the live monitoring module is connected with a main line where the isolating switch is located through a voltage transformer, the brush lifting control loop is connected with the live monitoring module, and when the main line is monitored to be live, the brush lifting control loop controls the brush lifting device to be locked.
3. The real-time monitoring system for the isolating switch as claimed in claim 1, further comprising an accurate alignment device, wherein the accurate alignment device comprises an infrared emitting device and an infrared receiving device, the infrared emitting device and the infrared receiving device are respectively disposed on the conductive rods at two sides of the fixed contact and the movable contact, and the fixed contact and the movable contact are accurately aligned by guiding infrared rays in a rotating process of the movable contact.
4. The real-time monitoring system for the isolating switch as claimed in claim 1, further comprising a pressure detection device, wherein the pressure detection device comprises a pressure sensor, and the pressure sensor is assembled on a contact finger clamping spring in the isolating switch.
5. The real-time monitoring system for the isolating switch according to claim 4, wherein the pressure sensor is a wireless pressure sensor, and the pressure sensor transmits pressure data to a local receiving device in a wireless mode and then transmits the pressure data to an upper computer through a communication line.
6. The real-time monitoring system for the isolating switch as claimed in claim 1, further comprising a temperature detection device, wherein the temperature detection device comprises a wireless temperature detection sensor, and the wireless temperature detection sensor is fixed on the back surface of the contact finger in the isolating switch.
7. The real-time monitoring system for the isolating switch as claimed in claim 6, wherein the temperature detecting device further comprises a clamping member, and the wireless temperature detecting sensor is fixed on the back surface of the isolating switch finger through the clamping member.
8. The real-time monitoring system for the disconnecting switch according to claim 7, wherein a toothed rubber pad is arranged on the inner side of the clamping head of the clamping piece.
9. The real-time monitoring system for the isolating switch according to claim 7, wherein heat-dissipating silica gel is coated between the clamping member and the wireless temperature detection sensor and between the wireless temperature detection sensor and the inner contact finger of the isolating switch.
10. The real-time monitoring system for the disconnecting switch according to claim 1, wherein when the disconnecting switch is not switched on, the brush lifting control loop controls the first brush lifting device and the second brush lifting device to be locked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010751909.6A CN112067981A (en) | 2020-07-30 | 2020-07-30 | Real-time monitoring system for isolating switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010751909.6A CN112067981A (en) | 2020-07-30 | 2020-07-30 | Real-time monitoring system for isolating switch |
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| CN112067981A true CN112067981A (en) | 2020-12-11 |
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| CN202010751909.6A Pending CN112067981A (en) | 2020-07-30 | 2020-07-30 | Real-time monitoring system for isolating switch |
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| CN103743952A (en) * | 2013-11-28 | 2014-04-23 | 江苏省如高高压电器有限公司 | Portable loop resistance test tool of isolation switch |
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