Isolating switch double-confirmation device based on resistance-type displacement sensor

Abstract

The utility model relates to the technical field of electric power system disconnecting switch position state monitoring, in particular to a disconnecting switch double-confirmation device based on a resistance-type displacement sensor. The device comprises an isolation switch operator, the isolation switch operator is provided with a transmission shaft linked with an internal insulation pull rod, the outer end of the transmission shaft extends out of an isolation switch operator shell, and the outer end of the transmission shaft is fixedly connected with a transition shaft; the transition shaft is connected with a pull rod of a resistance-type displacement sensor through a transmission mechanism, the resistance-type displacement sensor is in communication connection with an upper computer, and opening and closing signals of the disconnecting switch are detected through the resistance-type displacement sensor and the upper computer. According to the utility model, the resistance-type displacement sensor is used in the isolating switch double-confirmation device, so that whether opening and closing are in place can be accurately detected. Meanwhile, key parameters such as closing and opening speed, closing and opening time, contact travel and the like can be detected, and the complete motion state of the isolating switch can be visually reflected.

Description

Technical Field

[0001] The utility model relates to the technical field of position state monitoring of disconnectors in power systems, and particularly relates to a double-confirmation device for disconnectors based on resistive displacement sensors. Background Technique

[0002] GIS high-voltage disconnectors operate under high voltage and large current conditions. Among them, if the disconnector contacts are not in place during closing or opening, it may lead to an increase in contact resistance, causing the temperature of the contact point to rise, contact ablation, and in severe cases, partial discharge may occur, which may further trigger a series of major safety accidents. Therefore, it is very important to reliably judge the closing and opening positions of the disconnector. The existing GIS disconnector equipment mainly uploads the telemetry data of the disconnector through the auxiliary switch of the operating mechanism. However, in order to improve the reliability of judgment, the power industry is actively promoting the "double-confirmation" technology for switch states, that is, adding a non-homologous monitoring channel for judgment in addition to the judgment through the auxiliary switch.

[0003] There are also some double-confirmation structures for GIS disconnectors on the market, mainly including double-confirmation structures for disconnectors based on microswitches, attitude sensors, and magnetic induction sensors. However, the current double-confirmation structures have problems such as complex precision adjustment, inability to accurately reflect the closing and opening times, and inability to detect key parameters such as closing and opening speeds and contact travel. Summary of the Invention

[0004] To solve the above problems, the utility model provides a double-confirmation device for disconnectors based on resistive displacement sensors, which accurately detects the opening / closing state, time, and speed through resistive displacement sensors.

[0005] The technical solution of the utility model is as follows:

[0006] A double-confirmation device for disconnectors based on resistive displacement sensors includes a disconnector operator. The disconnector operator is provided with a transmission shaft linked to an internal insulating pull rod. The outer end of the transmission shaft extends out of the disconnector operator housing, and a transition shaft is fixedly connected to the outer end of the transmission shaft. The transition shaft is connected to the pull rod of the resistive displacement sensor through a transmission mechanism. The resistive displacement sensor is communicatively connected to a host computer, and the opening and closing signals of the disconnector are detected through the resistive displacement sensor and the host computer.

[0007] Further, the transmission mechanism is a crank-slider mechanism, including a connecting rod pair, a guide rail, and a slider. One end of the connecting rod pair is sleeved on the transition shaft, and the other end is connected to the slider. The slider is slidably connected to the guide rail, and the slider is provided with a crank arm for connecting to the pull rod of the resistive displacement sensor.

[0008] The utility model adopts a resistive displacement sensor, and through a transmission mechanism, it converts the rotation of a transmission shaft that rotates synchronously with the isolating switch's insulating pull rod into the linear telescopic movement of the resistive displacement sensor's pull rod. By detecting the change in the internal resistance value of the sensor, it can detect the opening and closing states of the isolating switch, and at the same time, it can accurately record the opening / closing time and opening / closing speed through a host computer.

[0009] In addition to the above-mentioned electric control judgment method, the utility model also has a mechanical indication method, that is, a pointer is connected to the outer end of the transition shaft, and an opening / closing indicator board is arranged behind the pointer. The transition shaft drives the pointer to swing to indicate the opening / closing state of the isolating switch.

[0010] Preferably, a rain shield is arranged above the resistive displacement sensor, and the opening / closing indicator board is arranged on the rain shield, which can meet the outdoor installation environment of the isolating switch and prevent the resistive displacement sensor from being rained on.

[0011] The beneficial effects of the utility model are as follows:

[0012] (1) The utility model uses a resistive displacement sensor in the double-confirmation device of the isolating switch, making good use of the advantages of accurate measurement and good stability of this sensor, and can accurately detect whether the opening and closing are in place. At the same time, this sensor can also detect key parameters such as closing and opening speeds, closing and opening times, and contact stroke, and transmit the detection data to the host computer. The host computer can draw a waveform diagram of the movement of the isolating switch's knife switch, and through the waveform diagram, the complete movement state of the isolating switch can be intuitively reflected.

[0013] (2) The utility model sets a pointer and an opening / closing indicator board. When the transmission shaft of the isolating switch rotates, it can drive the pointer to swing synchronously. When closing, the pointer can swing to the "closed" position on the indicator board; when opening, the pointer can swing to the "open" position on the indicator board. And it can correspond to the corresponding scales to assist in judging whether the closing is in place.

[0014] (3) The utility model adopts an integrated design, which can ensure the sensitivity and reliability of the resistive displacement sensor, truly reflect the state of the knife switch, and at the same time does not affect the normal operation of the primary equipment. On the basis of not changing the original structure of the isolating switch, the sensor can be fixed by using the original bolt holes of the isolating switch. At the same time, rain-proof treatment is considered to make the sensor not directly exposed to rainwater, appropriately extending the service life of the sensor. Description of the Drawings

[0015] Figure 1 is the three-dimensional schematic diagram of the utility model;

[0016] Figure 2 is the front view of the utility model;

[0017] Figure 3It is a partial sectional view schematic diagram of the utility model;

[0018] Figure 4 It is a three-dimensional schematic diagram of the utility model with the rain shield removed;

[0019] Figure 5 It is the front view of the utility model with the rain shield removed;

[0020] Figure 6 It is a three-dimensional schematic diagram of the transition shaft of the utility model;

[0021] Figure 7 It is the circuit principle block diagram of the utility model;

[0022] In the figure, 1. Rain shield, 2. Disconnector operator, 3. Switching-on and switching-off indicator board, 4. Pointer, 5. Connecting flange, 6. Resistive displacement sensor, 7. Transition shaft, 8. Pull rod, 9. Slide block, 10. Guide rail, 11. Square column connecting rod, 12. Cylindrical connecting rod, 13. Host computer. Specific embodiments

[0023] The structure of the utility model will be described in detail below with reference to the accompanying drawings.

[0024] A double-confirmation device for a disconnector based on a resistive displacement sensor, as Figure 1 shown, includes a disconnector operator 2, and the disconnector operator is located at one end of the disconnector of phase A or phase B or phase C. One end of the disconnector operator 2 is provided with a connecting flange 5. The disconnector operator 2 is provided with a transmission shaft. One end of the transmission shaft is located inside the disconnector operator housing and is linked with the insulating pull rod inside it, and can rotate synchronously with the switching-on and switching-off operations of the insulating pull rod. The other end of the transmission shaft extends out of the disconnector operator housing and is fixedly connected to a transition shaft 7 through bolts, and the transition shaft rotates synchronously with the transmission shaft.

[0025] As Figure 4 , 5 shown, a resistive displacement sensor 6 and a crank-slider mechanism are further installed outside the connecting flange 5 of the device, and the resistive displacement sensor is arranged horizontally. As Figure 6 shown, the transition shaft 7 is processed with steps and threads. The crank-slider mechanism includes a connecting rod pair, a guide rail 10 and a slide block 9. The guide rail is horizontally fixed on the connecting flange and is parallel to the pull rod 8 of the resistive displacement sensor. The bottom of the slide block 9 is slidably connected to the guide rail 10. The slide block extends a crank arm towards the resistive displacement sensor side and is connected to the pull rod of the sensor. The connecting rod pair includes a square column connecting rod 11 and a cylindrical connecting rod 12 which are hinged. The end of the square column connecting rod is stuck at the step of the transition shaft and locked with a nut. The end of the cylindrical connecting rod is connected to the slide block. When the transmission shaft drives the transition shaft to rotate, the slide block reciprocates horizontally along the guide rail, thereby pulling the pull rod of the resistive displacement sensor left and right.

[0026] As Figure 1 、 2 shown in Figure 3, the device is also provided with a rain shield 1. The rain shield 1 includes an arc-shaped top plate and side plates, which are used to shield the resistive displacement sensor and the transmission mechanism to prevent them from being rained on. A hole is opened in the lower middle part of the bottom of the side plate of the rain shield 1 for the end of the transition shaft to extend out. The end of the transition shaft 7 is connected to a vertically upward pointer 4, and the pointer can rotate synchronously with the transition shaft and the transmission shaft. A closing and opening indicator plate 3 is provided on the upper part of the side plate. The closing and opening indicator plate 3 is marked with scales and the words "open" and "close" according to the position of the pointer when the transmission shaft rotates.

[0027] The working process of the utility model is as follows:

[0028] When using the disconnector operator to perform the closing and opening operations on the disconnector, the transmission shaft drives the transition shaft to rotate synchronously, and drives the pull rod of the resistive displacement sensor to stretch horizontally along the horizontal direction through the crank-slider mechanism. The movement of the pull rod of the resistive displacement sensor causes a change in the internal induction resistance. The resistive displacement sensor converts the changed resistance into a voltage signal and transmits it to the upper computer. The upper computer converts the voltage signal and the dimensional parameters of the crank-slider mechanism into the rotation angle of the disconnector transmission shaft and the movement stroke of the disconnector contact, so as to judge whether the closing and opening of the disconnector are in place, as well as the excess and deficiency of the closing and opening. In addition, the upper computer records the starting and ending positions according to the resistive displacement sensor, automatically calculates and converts them into the stroke of the disconnector contact, and combines with the movement time to calculate the closing and opening speeds of the disconnector. The above parameters are intuitively displayed on the upper computer display screen. When the transmission shaft and the transition shaft rotate, the pointer rotates synchronously, and further indicates the rotation angle of the transmission shaft on the closing and opening indicator plate, so that the closing and opening positions of the disconnector can be intuitively judged.

Claims

1. A dual confirmation device for an isolating switch based on a resistive displacement sensor, comprising an isolating switch operator (2), wherein the isolating switch operator (2) is provided with a transmission shaft linked to an internal insulating pull rod, wherein the outer end of the transmission shaft extends out of a housing of the isolating switch operator, and wherein: The outer end of the transmission shaft is fixedly connected to a transition shaft (7); the transition shaft (7) is connected to a pull rod (8) of a resistive displacement sensor (6) through a transmission mechanism; the resistive displacement sensor (6) is communicatively connected to a host computer (13); and the disconnection and closing signals of the isolating switch are detected through the resistive displacement sensor and the host computer.

2. The isolating switch double confirmation device based on a resistive displacement sensor according to claim 1 is characterized in that: The transmission mechanism is a crank slider mechanism, comprising a connecting rod pair, a guide rail (10) and a slider (9); one end of the connecting rod pair is sleeved with a transition shaft (7), and the other end is connected to the slider (9); the slider is slidably connected to the guide rail; the slider (9) is provided with a crank arm for connecting to a pull rod of a resistive displacement sensor.

3. The isolating switch double confirmation device based on a resistive displacement sensor according to claim 1 or 2, characterized in that: The outer end of the transition shaft (7) is connected to a pointer (4), and an opening / closing indicator (3) is provided on the rear side of the pointer. The transition shaft drives the pointer to swing, indicating the opening / closing state of the disconnector.

4. The isolating switch double confirmation device based on a resistive displacement sensor according to claim 3 is characterized in that: A rain cover (1) is provided above the resistive displacement sensor, and the switch opening and closing indicator is arranged on the rain cover.

Images