Checking device for SF6 density relay

Abstract

The utility model belongs to the technical field of electric power detection equipment, and particularly relates to a verification device for an SF6 density relay, which comprises a communicating piece connected with the SF6 density relay, and the communicating piece is provided with an inflation pipeline interface used for being connected with an inflation pipeline; the communicating piece is also connected with an air pressure adjusting device for adjusting the air pressure in the SF6 density relay; through the air pressure adjusting device communicated with the SF6 density relay, the air pressure of the SF6 density relay can be slowly and controllably adjusted, so that the adjusting accuracy and the checking accuracy are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power detection equipment technical field especially relates to a check device for SF6 density relay. BACKGROUND

[0002] In the operation and maintenance work of GIS equipment of the transformer substation, the contact action value of SF6 density relay in GIS equipment needs to be strictly checked to ensure the safe and reliable operation of the equipment.

[0003] At present, the following steps are generally taken for the check process of the contact action value and the reset value of SF6 density relay: first, ensure that the valve between SF6 density relay and the gas chamber is in the closed state; then, use a special tool to open the check valve of the equipment gas chamber filling port, so that the gas is discharged from the filling port, and the internal pressure is reduced for checking.

[0004] However, this method has significant defects, that is, it cannot effectively regulate the discharge flow rate of SF6 gas, and cannot accurately control the pressure level in the table cavity. Therefore, it is difficult to ensure the accuracy of the signal contact action value and the reset value during the checking process, and the overall process is relatively complex, and the work efficiency needs to be improved. INVENTION CONTENTS

[0005] The utility model discloses a check device for SF6 density relay mainly solves the problem that the checking accuracy of SF6 density relay is poor at present.

[0006] To achieve the purpose, the utility model provides a check device for SF6 density relay, which comprises a communication part connected with the SF6 density relay, and a gas filling pipe interface for connecting with the gas filling pipe is arranged on the communication part; the communication part is also connected with a gas pressure adjusting device for adjusting the gas pressure in the SF6 density relay.

[0007] Preferably, the gas pressure adjusting device comprises a cylinder body communicated with a tee pipe, a piston arranged in the cylinder body and a piston rod connected with the piston, one end of the piston rod extends out of the cylinder body and is connected with an adjusting knob, and the adjusting knob can drive the piston to move in the cylinder body by rotating.

[0008] Preferably, the piston rod is screw-connected with the cylinder body.

[0009] Preferably, anti-skid strips are arranged circumferentially on the adjusting knob.

[0010] Preferably, a live joint nut connected with the gas filling pipe is arranged on the structure of the gas filling pipe.

[0011] Preferably, the communication part is a tee pipe.

[0012] The technical solution provided by the utility model has at least the following technical effects:

[0013] The SF6 density relay calibration device disclosed by the present invention, when in operation, needs to first use the gas filling pipeline to inject gas into the SF6 density relay. After the gas filling process is completed, the valve of the gas filling pipeline should be closed immediately, and the pressure reducing valve at the outlet of the SF6 gas cylinder should be gently released. Afterwards, the connection between the SF6 density relay and the SF6 gas cylinder and the GIS equipment body needs to be disconnected. At this time, the calibration work can be started using the small amount of gas remaining in the internal meter cavity of the SF6 density relay. During the calibration process, the air pressure regulating device needs to be adjusted slowly and accurately to adjust the air pressure inside the SF6 density relay until the background terminal sends an alarm or lockout signal. Subsequently, the actual pressure value indicated by the meter pointer at this time should be compared with the alarm or lockout pressure value marked on the SF6 density relay nameplate to see if it is consistent. Through this air pressure regulating device connected to the SF6 density relay, the air pressure of the SF6 density relay can be slowly and controllably adjusted, thereby improving the accuracy of the adjustment and the accuracy of the calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic structural diagram of the SF6 density relay calibration device according to an embodiment of the present utility model.

[0016] Figure 2 This is a side view of the SF6 density relay calibration device according to an embodiment of the present utility model.

[0017] Explanation of the main reference numerals: 1. Inflating pipe adapter; 2. Union nut; 3. Cylinder body; 4. Piston rod; 5. Adjustment knob; 6. Connecting piece; 7. Density relay interface; 8. Cylinder body interface; 9. Inflating pipe interface. DETAILED DESCRIPTION

[0018] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0019] According to an embodiment of the present utility model

[0020] Reference Figure 1 、 Figure 2 This embodiment discloses a calibration device for an SF6 density relay, including a connecting piece 6 connected to the SF6 density relay. In this embodiment, the connecting piece 6 is a tee. A density relay interface 7 is provided on the connecting piece 6. The density relay interface 7 is connected to the SF6 density relay via an air line adapter 1. The connecting piece 6 is provided with an air line interface 9 for connecting to the air line. The air line structure is provided with a union nut 2 connected to the air line, and the connecting piece 6 is connected to the air line via the union nut 2. The connecting piece 6 is also connected to a pressure regulating device for regulating the air pressure within the SF6 density relay. The pressure regulating device is connected to the SF6 density relay via the tee, thereby enabling controllable adjustment of the air pressure within the SF6 density relay.

[0021] The air pressure regulating device includes a cylinder body 3 connected to a tee, a piston disposed within the cylinder body 3, and a piston rod 4 connected to the piston. The tee is connected to the cylinder body 3 through an interface of the cylinder body 3. One end of the piston rod 4 extends outside the cylinder body 3 and is connected to an adjustment knob 5. Rotating the adjustment knob 5 drives the piston to move within the cylinder body 3. The piston rod 4 is threadedly connected to the cylinder body 3. Rotating the adjustment knob 5 drives the piston rod 4 to rotate and drives the piston to move within the cylinder body 3. By rotating the adjustment knob 5, the threaded connection between the piston rod 4 and the cylinder body 3 is utilized to drive the piston to move precisely within the cylinder body 3.

[0022] In order to enhance stability and safety during operation, anti-slip strips are specially added around the circumference of the adjustment knob 5. This significantly improves the anti-slip performance of the knob, ensuring that it can be firmly held during the adjustment process to avoid slipping.

[0023] This device can verify the node signal of the SF6 density relay at any stage of the inflation process. Before verification, it is only necessary to close the valves between the SF6 density relay and the equipment, as well as the inflation pipeline valve, and use the piston to reduce or increase the pressure of the SF6 gas in the meter cavity, forcing the SF6 density relay to send a signal to the background terminal. The verification can then be completed by comparing the actual pressure value of the meter pointer with the pressure value marked on the SF6 density relay nameplate to see if they are consistent.

[0024] Specific verification principle: When all pipeline connections are completed, first observe the position of the SF6 density relay needle, and close the valve connecting the SF6 density relay and the GIS equipment body, lock the adjustment knob 5 to ensure that the inside of the cylinder is closed, then open the valve of the charging pipeline, adjust the SF6 gas cylinder outlet pressure reducing valve, and after the needle is filled to the green zone position, close the valve of the charging pipeline, loosen the SF6 gas cylinder outlet pressure reducing valve, cut off the connection between the SF6 density relay and the SF6 gas cylinder and the GIS equipment body, use a small amount of gas in the internal meter cavity of the SF6 density relay to start the verification work, and slowly loosen the adjustment knob 5 to The SF6 density relay releases pressure (the piston in cylinder 3 moves to the right). After an alarm signal appears on the back-end terminal device, compare the actual pressure value of the meter pointer at this time with the alarm pressure value marked on the nameplate of the SF6 density relay to see if they are consistent. Some SF6 density relays have a lower locking pressure value. You only need to continue to slowly loosen the adjustment knob 5 to release the pressure. After a locking signal appears on the back-end terminal device, compare the actual pressure value of the meter pointer at this time with the locking pressure value marked on the nameplate of the SF6 density relay to see if they are consistent. Then rotate the adjustment knob 5 to the maximum position, and the SF6 density relay pointer will return to zero or approach zero.

[0025] Re-pressurize to ensure that the calibration is accurate, slowly tighten the gas adjustment knob 5 to increase the pressure (the piston in the rod body moves to the left), and wait until the locking signal of the background terminal device disappears, and compare the actual pressure value of the meter pointer at this time with the locking pressure value marked on the nameplate of the SF6 density relay to see if they are consistent; continue to rotate and slowly tighten the adjustment knob 5 to increase the pressure, and wait until the alarm signal of the background terminal device disappears, and compare the actual pressure value of the meter pointer at this time with the locking alarm value marked on the nameplate of the SF6 density relay to see if they are consistent, and complete the calibration of the SF6 density relay.

[0026] This device effectively calibrates SF6 gas density relays at any ambient temperature while continuously powered. The reciprocating motion of piston rod 4 within cylinder 3 regulates internal pressure, both boosting and reducing it. This process produces no pollution to the gas source or the surrounding environment, ensuring the safe and stable operation of high-voltage equipment such as SF6 density relays. Furthermore, this device efficiently and conveniently completes SF6 density relay calibration tasks, offering a simple overall operation process and exceptional ease of use, demonstrating significant economic value.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made on the basis of and within the scope of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A calibration device for SF6 density relay, characterized in that: The invention comprises a connecting piece (6) connected to an SF6 density relay, wherein the connecting piece (6) is provided with an air filling pipeline interface (9) for connecting to an air filling pipeline, and the connecting piece (6) is also connected to an air pressure regulating device for regulating the air pressure in the SF6 density relay.

2. The SF6 density relay calibration device according to claim 1, characterized in that: The air pressure regulating device comprises a cylinder (3) connected to a three-way pipe, a piston arranged in the cylinder (3), and a piston rod (4) connected to the piston. One end of the piston rod (4) extends outside the cylinder (3) and is connected to an adjusting knob (5). The adjusting knob (5) is rotated to drive the piston to move in the cylinder (3).

3. The SF6 density relay calibration device according to claim 2, characterized in that: The piston rod (4) is threadedly connected to the cylinder body (3).

4. The SF6 density relay calibration device according to claim 2, characterized in that: An anti-slip strip is provided circumferentially on the adjusting knob (5).

5. The SF6 density relay calibration device according to claim 2, characterized in that: The inflation pipeline structure is provided with a movable nut (2) connected to the inflation pipeline.

6. The SF6 density relay calibration device according to claim 2, characterized in that: The connecting piece (6) is a three-way pipe.

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