CN219957790U - SF6 gas density relay's test device - Google Patents

Abstract

The utility model relates to a test device of an SF6 gas density relay, which is connected with a calibrated density relay, and comprises an oscilloscope, an SF6 pressure control module, a direct current power supply, a current limiting resistor and an ammeter, wherein the calibrated density relay, the direct current power supply, the current limiting resistor and the ammeter are connected to form a test loop, the SF6 pressure control module is connected with the calibrated density relay, and the oscilloscope is connected with a group of electric contacts of the calibrated density relay in parallel. Compared with the prior art, the utility model has the advantages of high accuracy, convenience and the like.

Description

SF6 gas density relay's test device

Technical Field

The utility model relates to a test device, in particular to a test device of an SF6 gas density relay.

Background

When gas insulation equipment such as GIS operates, the SF6 gas density relay is required to be checked regularly. When the work is carried out, the condition that the checking instrument cannot accurately judge the opening and closing of the electric contact of the SF6 gas density relay often happens, and finally, invalid checking results are caused, and the state of the SF6 gas density relay to be checked is misjudged. Among these SF6 gas density relays, some are in good condition in practice, and simple replacement wastes intense maintenance resources. Aiming at the SF6 gas density relay which cannot be accurately tested by the conventional calibrator, from the practical work, when retest and diagnostic test are carried out on the SF6 gas density relay, a set of test device capable of accurately identifying the open-close state needs to be developed so as to achieve the purpose of effectively evaluating the use state of the SF6 gas density relay.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a testing device of an SF6 gas density relay with high accuracy and convenience.

The aim of the utility model can be achieved by the following technical scheme:

the utility model provides a test device of SF6 gas density relay, is connected with being calibrated density relay, this test device includes oscilloscope, SF6 pressure control module, DC power supply, current-limiting resistor and ampere meter, being calibrated density relay, DC power supply, current-limiting resistor and ampere meter connection form test loop, SF6 pressure control module is connected with being calibrated density relay, the oscilloscope is parallelly connected with a set of electric contact of being calibrated density relay.

Further, the SF6 pressure control module comprises a pressure controller and a gas source, wherein the pressure controller is connected between the gas source and the calibrated density relay.

Further, the pressure controller is a controller that realizes air pressure control of-0.1 megapascal to 0.9 megapascal.

Further, the pressure controller is a control rate adjustable controller.

Further, the SF6 pressure control module is connected with the calibrated density relay through a gas pipeline.

Further, the direct current power supply is a power supply for outputting 0-150V direct current voltage.

Further, the current limiting resistor is a sliding rheostat.

Further, the sliding rheostat is a sliding rheostat with the maximum resistance of 20kΩ.

Further, the ammeter is a milliamp-level ammeter.

Further, the ammeter is an ammeter with accuracy of +/-1 mA and measuring range of 1A.

Compared with the prior art, the utility model has the following beneficial effects:

1. the test device comprises the oscilloscope, pointer bouncing between the electric contacts and the process of arc burning can be acquired at the moment of opening and closing, and the acquired information is more, so that the SF6 gas density relay can be evaluated more comprehensively.

2. The test device of the utility model comprises an oscilloscope and an ammeter, and the judgment of the open-close state of the electric contact of the SF6 gas density relay is more accurate. When the electric contact is opened and closed, the sampling circuit of the existing checking instrument often misjudges the opening and closing states of the electric contact in the processes of bouncing and arcing due to bouncing and arcing for a certain time. In the test device, the double confirmation of the voltage value of the oscilloscope and the current value of the test loop is observed at the same time, so that the open-close state of the electric contact is judged more accurately.

3. The test device combines the loop for measuring the resistance of the electric contact with the verification loop, is more beneficial to recording the change condition of the resistance between the electric contacts of the SF6 gas density relay to be calibrated, and is more beneficial to distinguishing faults of the electric contacts which are not connected and defects of the electric contact resistance exceeding the standard.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

in the figure, a 1-direct current power supply, a 2-ammeter, a 3-current limiting resistor, a 4-calibrated density relay, a 5-oscilloscope and a 6-SF 6 pressure controller are arranged.

Detailed Description

The utility model will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present utility model, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present utility model is not limited to the following examples.

As shown in fig. 1, the embodiment provides a test device for an SF6 gas density relay, which is connected with a calibrated density relay (i.e. a calibrated SF6 gas density relay) 4, and the test device comprises an oscilloscope 5, an SF6 pressure control module 6, a direct current power supply 1, a current limiting resistor 3 and an ammeter 2, wherein the calibrated density relay 4, the direct current power supply 1, the current limiting resistor 3 and the ammeter 2 are connected to form a test loop, the SF6 pressure control module 6 is connected with the calibrated density relay 4, the oscilloscope 5 is connected with a group of electrical contacts of the calibrated density relay 4 in parallel, and the oscilloscope 5, the direct current power supply 1, the current limiting resistor 3 and the ammeter 2 are connected through signal wires. The oscilloscope 5 is used for collecting the voltage change between the electric contacts of the density-calibrated relay 4; the SF6 pressure control module 6 is used for providing certain pressure for the calibrated density relay 4, so that the electric contact point of the calibrated density relay is correspondingly changed in the opening and closing states, and the current pressure value can be displayed to staff; the direct current power supply 1 is used for generating certain voltage and applying the certain voltage to a test loop, so that the electric contact of the density-calibrated relay 4 has certain voltage in an off state; the current limiting resistor 3 is used for limiting the current in the test loop when the electrical contact of the density calibrating relay 4 is closed so as to protect each component part in the test loop; ammeter 2 is used to indicate the magnitude of the current in the test loop.

In a specific embodiment, the SF6 pressure control module 6 comprises a pressure controller and a gas source, the pressure controller being connected between the gas source and the calibrated density relay 4. In this embodiment, the pressure controller is a controller for achieving air pressure control of-0.1 megapascal to 0.9 megapascal, and is a control rate adjustable controller.

In a specific embodiment, the SF6 pressure control module 6 is connected with the calibrated density relay 4 through a gas pipeline, and the output pressure of the SF6 pressure control module 6 is sent to the calibrated density relay 4.

In a specific embodiment, the current limiting resistor 3 adopts a slide rheostat, and the ammeter 2 adopts a milliamp-level ammeter.

In this embodiment, the components of the oscilloscope 5, the pressure controller, the sliding rheostat, the milliamp level ammeter, the dc power supply 1 and the like are all commercially available instruments and meters. Specifically, parameters of the dc power supply 1 are: 220V input voltage, 0-150V output voltage and 0-10A output current. The parameters of the slide rheostat are as follows: the resistor uses power 2000W and the maximum resistor is 20kΩ. When the calibrated density relay 4 is opened, the loop current is 0, and when the calibrated density relay is closed, a small current is adopted in the loop, so that the ampere meter 2 adopts a milliamp level ampere meter, the precision is +/-1 mA, and the measuring range is 1A. The pressure controller can realize the air pressure control of-0.1 to 0.9 megapascals, the control speed is adjustable, and the air source can conveniently store and recycle the air.

When the density relay 4 to be calibrated is tested, the density relay 4 to be calibrated is connected with a testing device to form a testing loop. When the open-close state of the calibrated density relay 4 changes, the oscilloscope 5 collects the voltage change between the electric contacts of the calibrated density relay 4, the oscilloscope sampling frequency is high, the pointer bouncing and arc burning processes between the electric contacts during open-close can be accurately reflected, a tester can conveniently check the calibrated density relay 4 by observing waveforms displayed by the oscilloscope, the test loop current value can be read through the ammeter 2, double confirmation of the oscilloscope voltage value and the test loop current value is realized, and whether the calibrated density relay 4 fails or not is judged.

When the node of the density relay 4 to be calibrated is in the on-state, the resistance value of the whole loop can be calculated according to the indicating value of the ammeter 2 and the indicating value of the voltage of the direct current power supply 1, and the current resistance value of the current limiting resistor 3 is subtracted to obtain the accurate resistance of the electric contact.

In the above test device, the oscilloscope 5 is used to record the instantaneous voltage state of the node switching operation, when the gas pressure in the calibrated density relay 4 is smaller than the node operation set value, the node does not operate, and the oscilloscope voltage state is not changed, namely the electrical contact is judged to be different faults. When the gas pressure in the calibrated density relay 4 is smaller than the node action set value, the node acts, the voltage of the oscilloscope does not drop to the zero position, the resistance of the electric contact is overlarge at the moment, and the voltage distributed in the series circuit is larger, namely the failure of the electric contact resistance exceeding the standard, which is favorable for distinguishing the failure of the electric contact failure and the defect of exceeding the standard of the electric contact resistance.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (10)

1. The utility model provides a test device of SF6 gas density relay, is connected with by density relay (4), its characterized in that, this test device includes oscilloscope (5), SF6 pressure control module (6), DC power supply (1), current limiting resistor (3) and ampere meter (2), by density relay (4), DC power supply (1), current limiting resistor (3) and ampere meter (2) are connected and are formed test circuit, SF6 pressure control module (6) are connected with by density relay (4), oscilloscope (5) are parallelly connected with a set of electric contact by density relay (4).

2. Test device for an SF6 gas density relay according to claim 1, characterized in that the SF6 pressure control module (6) comprises a pressure controller and a gas source, the pressure controller being connected between the gas source and the calibrated density relay (4).

3. The apparatus for testing an SF6 gas density relay of claim 2, wherein the pressure controller is a controller that achieves a gas pressure control of-0.1 megapascals to 0.9 megapascals.

4. The test device for an SF6 gas density relay of claim 2, wherein the pressure controller is a control rate adjustable controller.

5. The test device of an SF6 gas density relay according to claim 1, characterized in that the SF6 pressure control module (6) is connected to the calibrated density relay (4) via a gas line.

6. The test device of an SF6 gas density relay according to claim 1, wherein the dc power supply (1) is a power supply outputting a dc voltage of 0-150V.

7. Test device for an SF6 gas density relay according to claim 1, characterized in that the current limiting resistor (3) is a slide rheostat.

8. The apparatus of claim 7, wherein the slide rheostat is a slide rheostat having a maximum resistance of 20kΩ.

9. The test device of an SF6 gas density relay according to claim 1, characterized in that the ammeter (2) is a milliamp-level ammeter.

10. The test device of an SF6 gas density relay according to claim 9, wherein the ammeter (2) is an ammeter with an accuracy of ±1ma and a measuring range of 1A.