A Gas Relay Contact Capacity Tester

Abstract

The present application discloses a gas relay contact capacity tester, which includes: a breaking capacity test module, a contact resistance test module, and a switching module; the switching between the two test functions of the reed contact breaking capacity and the reed contact resistance, as well as the switching between each test contact, can be realized by setting the sorting adjustment button. When conducting a test on one gas relay, the number of times of operating the instrument and wiring is reduced from 6 times of operating the instrument and 6 times of wiring originally to 1 time of operating the instrument and 1 time of wiring, improving the operation efficiency and reducing the operation risk. And the above modules are solidified inside the instrument, which is more conducive to the repeated conduct of tests, reducing test errors and the risk of electric shock to test personnel. Further, the input of the instrument control signal and the output of the test data can be realized, and it can cooperate with the gas relay tester to automatically complete the generation and digital archiving of the gas relay calibration report; thus solving the technical problems of low operation efficiency and high test error in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of transformers, and particularly to a gas relay contact capacity tester. Background Art

[0002] Gas relays for transformers are widely used in the protection of power transformers and play a crucial role in the safe operation of the power system. After long-term operation, the contacts of the gas relay are prone to burning damage and water droplets are also likely to accumulate in the gas relay, making its operation unreliable. According to the regulations of DL / T 540-2013 Gas Relay Calibration Specification, the gas relay of the transformer should be calibrated regularly. Among them, the gas relay contact capacity test is a routine test and a type test item.

[0003] The existing test scheme consists of two parts: the dry reed contact breaking capacity test and the dry reed contact resistance test. For the breaking capacity test, the dry reed contact breaking capacity test uses a DC 220V constant voltage source, an external 60W light bulb, which is connected in series with the dry reed contact to be tested. By applying an oil flow impact to the gas relay, the dry reed tube is made to open, and the test result is judged according to whether the light bulb emits light normally; for the dry reed contact resistance, a low-resistance tester is used to measure the contact resistance of the dry reed contact. During the test, the two ends of the test line of the low-resistance tester are connected in series with the dry reed contact to be tested, and at the same time, an oil flow impact is also applied to the relay to make the dry reed tube open, and the contact resistance of the dry reed contact is measured. During the test, the test results need to be manually recorded, and then the recorded results are filled into the gas relay tester manually to generate a gas relay calibration report. This method mainly has the following problems: 1) Existing gas relays usually consist of 1 set of light gas and 2 sets of heavy gas trip contacts. For the dry reed contact breaking capacity test and the dry reed contact resistance test, the instrument needs to be switched 6 times and the wiring needs to be done 6 times, resulting in repetitive work, large workload and low work efficiency; 2) In the dry reed contact breaking capacity test, an external 60W light bulb needs to be fixed on the test bench and connected to the power supply, the light bulb and the instrument test line with wires. The output of the test power supply is DC 220V, there is a risk of insulation breakdown, leading to electric shock of the test personnel; in addition, due to the differences in the external circuits, it is not conducive to the reproduction of the test conditions, affecting the accuracy and standardization of the test; due to the limitations of the external circuit, the instrument is only applicable to tests at fixed positions in the laboratory, with harsh test conditions and a small scope of application; 3) During the test, the test results need to be manually recorded, and then the recorded results are filled into the gas relay tester manually to form a gas relay calibration report. Summary of the Invention

[0004] The purpose of this application is to provide a gas relay contact capacity tester to solve the technical problems of low operation efficiency and high test error in the prior art.

[0005] In view of this, the present application provides a gas relay contact capacity tester, including: a breaking capacity test module, a contact resistance test module, and a switching module;

[0006] Among them, the breaking capacity test module includes: a first measured point and a second measured point; the contact resistance test module includes: a third measured point and a fourth measured point; the switching module includes: a test socket for setting the gas relay to be tested, a power switching relay, several contact switching relays, and a switching control panel;

[0007] The test socket is respectively connected to one end of each contact switching relay through several connecting wires, and the other ends of each contact switching relay are respectively connected to the first measured point, the second measured point, the third measured point, and the fourth measured point, thereby forming a light gas contact switching relay and a heavy gas contact switching relay;

[0008] The switching control panel is used to, after responding to a test instruction, according to the action state of the gas relay to be tested, control the connection of the light gas contact switching relay or the heavy gas contact switching relay, and control the operation of the power switching relay, so that the breaking capacity test module or the contact resistance test module is connected, thereby completing the test of the breaking capacity and contact resistance of the gas relay to be tested in the light gas state or the heavy gas state.

[0009] Optionally, the breaking capacity test module uses a DC regulated power supply and a light bulb for series wiring, and sets the first measured point and the second measured point.

[0010] Optionally, the contact resistance test module includes: an output sampling module and an AC power supply connected to the third measured point and the fourth measured point;

[0011] The output sampling module is used to collect the contact resistance signal of the gas relay to be tested;

[0012] The AC power supply is used to provide electrical energy for the contact resistance test module.

[0013] Optionally, the contact resistance test module further includes: a key processing module, a power amplifier module, a main control module, a communication processing module, and a display module;

[0014] The key processing module is used to receive the instructions of the tester and send them to the main control module;

[0015] The main control module is used to control the operation of the communication processing module or the display module in response to the instructions of the tester;

[0016] The power amplifier module is used to amplify the power of the contact resistance signal;

[0017] The display module is configured to display the contact resistance signal;

[0018] The communication processing module is configured to send the contact resistance signal to the control host, so that the control host stores the contact resistance signal.

[0019] Optionally, the AC power supply: uses an AC 220V power supply and generates three power supplies of 5V, +8V, and -8V through a multi-tap transformer; among them, the 5V power supply provides electrical energy for the main control module, the +8V power supply provides electrical energy for the power amplifier module, and the -8V power supply provides electrical energy for the output sampling module.

[0020] Optionally, one side of the test socket is correspondingly connected to 5 contacts of the gas relay to be tested through 5 connection lines.

[0021] Optionally, each of the contact switching relays is: a double-pole double-throw relay.

[0022] The advantages of the embodiments of the present application are as follows:

[0023] In the embodiments of the present application, a gas relay contact capacity tester is provided, including: a breaking capacity test module, a contact resistance test module, and a switching module; among them, the breaking capacity test module includes: a first measured point and a second measured point; the contact resistance test module includes: a third measured point and a fourth measured point; the switching module includes: a test socket for setting the gas relay to be tested, a power supply switching relay, several contact switching relays, and a switching control panel; the test socket is respectively connected to one end of each contact switching relay through several connection lines, and the other ends of each contact switching relay are respectively connected to the first measured point, the second measured point, the third measured point, and the fourth measured point, so as to form a light gas contact switching relay and a heavy gas contact switching relay; the switching control panel is configured to, after responding to a test instruction, according to the action state of the gas relay to be tested, control the light gas contact switching relay or the heavy gas contact switching relay to be connected, and control the power supply switching relay to work, so that the breaking capacity test module or the contact resistance test module is connected, thereby completing the tests of the breaking capacity and contact resistance of the gas relay to be tested in the light gas state or the heavy gas state.

[0024] Compared with the prior art:

[0025] 1) The gas relay contact capacity tester of the present application can realize the switching between the two test functions of the breaking capacity of the reed contact and the contact resistance of the reed contact and the switching between each test contact point by setting the sorting adjustment button. When testing 1 gas relay, the number of times of switching on and off the instrument and wiring is reduced from 6 times to 1 time each, improving the operation efficiency and reducing the operation risk;

[0026] 2) The gas relay contact capacity tester of the present application solidifies all components inside the instrument, which is more conducive to the repeated conduct of tests, reduces test errors, and reduces the risk of electric shock to test personnel.

[0027] 3) The gas relay contact capacity tester of the present application is a portable instrument, which is not restricted by the test location and test environment, and expands the applicable range of the instrument.

[0028] 4) The gas relay contact capacity tester of the present application is designed with input and output serial ports, which can realize the input of instrument control signals and the output of test data, can cooperate with the gas relay tester to automatically complete the generation and digital archiving of gas relay calibration reports, and provides conditions for the subsequent intelligent development of gas relay calibration platforms. Description of the Drawings

[0029] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is the circuit schematic diagram of an AC220V power supply and switching module provided by the embodiment of the present application;

[0031] Figure 2 It is the circuit schematic diagram of a breaking capacity test module provided by the embodiment of the present application;

[0032] Figure 3 It is the circuit schematic diagram of a contact resistance test module provided by the embodiment of the present application. Detailed Embodiments

[0033] The following will clearly and completely describe the technical solutions of the present application with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] Please refer to Figure 1 , 2 and 3. In an embodiment of the present application, a gas relay contact capacity tester is provided, including: a breaking capacity test module, a contact resistance test module, and a switching module;

[0037] Among them, the breaking capacity test module includes: a first measured point and a second measured point; the contact resistance test module includes: a third measured point and a fourth measured point; the switching module includes: a test socket for setting the gas relay to be measured, a power switching relay, a plurality of contact switching relays, and a switching control panel; the test socket is respectively connected to one end of each contact switching relay through a plurality of connecting wires, and the other ends of each contact switching relay are respectively connected to the first measured point, the second measured point, the third measured point, and the fourth measured point, so as to form a light gas contact switching relay and a heavy gas contact switching relay;

[0038] It should be noted that Figure 2 is the circuit schematic diagram of the breaking capacity test module. A DC regulated power supply and a light bulb are connected in series, and the first measured point and the second measured point are set. Specifically, after the switchable AC 220V power supply is input, it passes through the switch S1, reaches the rectifier bridge, and becomes DC 220V after rectification and filtering. The measured points Test1 (the first measured point) and Test2 (the second measured point) are reserved and connected in series with the 60W light bulb Lamp1 to form a loop. Test1 and Test2 can be respectively connected to the heavy gas contact 1 and the heavy gas contact 2 through control switching.

[0039] Figure 3It is the circuit schematic diagram of the contact resistance test module, including: an output sampling module connected to the third and fourth measured points, an AC power supply, a key processing module, a power amplifier module, a main control module, a communication processing module, and a display module. Specifically: an AC 220V power supply is adopted. After the switchable AC 220V power supply is input, it passes through the switch S3 and reaches the power transformer T1. T1 is a multi-tap transformer that can generate three power supplies of 5V, +8V, and -8V. The 5V power supply is used by the main control module, and the +8V and -8V power supplies are used for the power amplifier and output sampling modules. The main control module is respectively connected to the key processing module, the communication processing module, the display module, and the power amplifier module through the interface circuit. The contact resistance test is completed at the measurement points Test3 (the third measured point) and Test4 (the fourth measured point). The measurement points can be connected through the switching circuit of the heavy gas contact 1 and the heavy gas contact 2 to complete the test. The key processing module is used to receive the instructions of the test personnel and send them to the main control module; the main control module is used to respond to the instructions of the test personnel to control the communication processing module or the display module to work; the power amplifier module is used to amplify the power of the contact resistance signal; the display module is used to display the contact resistance signal; the communication processing module is used to send the contact resistance signal to the control host, so that the control host stores the contact resistance signal.

[0040] The switching control panel is used to, after responding to the test instruction, control the light gas contact switching relay or the heavy gas contact switching relay to be connected according to the action state of the to-be-tested gas relay, and control the power supply switching relay to work, so that the disconnection capacity test module or the contact resistance test module is connected, thereby completing the tests of the disconnection capacity and the contact resistance of the to-be-tested gas relay in the light gas state or the heavy gas state.

[0041] It should be noted that Figure 1 It is the circuit schematic diagram of the AC220V power supply and the switching module. The AC power supply is connected to the relay K1 after passing through the S2 switch. Another path of the power supply is converted into a 5V signal by the power supply module to supply power to the switching control board. The switching control board completes the switching of the contact capacity and contact resistance test functions through the double-pole double-throw contacts of the K1 relay. The double-pole double-throw relays K2, K3, and K4 respectively complete the test switching of the two contacts of heavy gas 1 and heavy gas 2 (light gas and heavy gas are different states of the gas relay. Light gas is when the gas relay is filled with a certain amount of gas and the contact is closed, and heavy gas is when the baffle acts and the contact is closed). The 5 wires of the test socket are correspondingly connected to the 5 contacts of the to-be-tested gas relay. The control switching board can be connected to the control computer through the input RS232 port Txd, Rxd, and GND signals to complete the input of the switching command.

[0042] An embodiment of the present application provides a portable gas relay contact capacity tester. By setting sorting adjustment buttons, the switching between two test functions of the disconnection capacity of the reed contact and the contact resistance of the reed contact, as well as the switching between each test contact, can be realized. When performing a gas relay test, the number of times of turning on and off the instrument and wiring is reduced from 6 times and 6 times respectively in the original method to 1 time of turning on and off the instrument and 1 time of wiring, improving the operation efficiency and reducing the operation risk. In addition, the instrument is designed with input and output serial ports, which can realize the input of instrument control signals and the output of test data, and can cooperate with the gas relay tester to automatically complete the generation and digital archiving of the gas relay calibration report. Thus, the technical problems of low operation efficiency and high test error in the prior art are solved.

[0043] It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (one) of the following" or its similar expression refers to any combination of these items, including any combination of single item (one) or plural items (ones). For example, at least one (one) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A gas relay contact capacity tester, characterized in that, Including: A disconnection capacity test module, a contact resistance test module, and a switching module; Among them, the disconnection capacity test module includes: a first measured point and a second measured point; the contact resistance test module includes: a third measured point and a fourth measured point; the switching module includes: a test socket for setting the gas relay to be tested, a power supply switching relay, several contact switching relays, and a switching control panel; The test socket is respectively connected to one end of each contact switching relay through several connecting wires, and the other ends of each contact switching relay are respectively connected to the first measured point, the second measured point, the third measured point, and the fourth measured point, thereby forming a light gas contact switching relay and a heavy gas contact switching relay; The switching control panel is used to, after responding to a test instruction, according to the action state of the gas relay to be tested, control the connection of the light gas contact switching relay or the heavy gas contact switching relay, and control the operation of the power supply switching relay, so that the disconnection capacity test module or the contact resistance test module is connected, thereby completing the test of the disconnection capacity and contact resistance of the gas relay to be tested in the light gas state or the heavy gas state.

2. The gas relay contact capacity tester according to claim 1, characterized in that, The disconnection capacity test module is connected in series with a DC regulated power supply and a light bulb, and the first measured point and the second measured point are set.

3. The gas relay contact capacity tester according to claim 1, characterized in that, The contact resistance test module includes: an output sampling module connected to the third measured point and the fourth measured point, and an AC power supply; The output sampling module is used to collect the contact resistance signal of the gas relay to be tested; The AC power supply is used to provide electrical energy for the contact resistance test module.

4. The gas relay contact capacity tester according to claim 3, characterized in that, The contact resistance test module further includes: a key processing module, a power amplifier module, a main control module, a communication processing module, and a display module; The key processing module is used to receive the instructions of the tester and send them to the main control module; The main control module is used to control the operation of the communication processing module or the display module in response to the instructions of the tester; The power amplifier module is used to amplify the power of the contact resistance signal; The display module is used to display the contact resistance signal; The communication processing module is used to send the contact resistance signal to the control host, so that the control host stores the contact resistance signal.

5. The gas relay contact capacity tester according to claim 4, wherein The AC power supply: uses an AC 220V power supply and generates three power supplies of 5V, +8V, and -8V through a multi-tap transformer; among them, the 5V power supply provides electrical energy for the main control module, the +8V power supply provides electrical energy for the power amplifier module, and the -8V power supply provides electrical energy for the output sampling module.

6. The gas relay contact capacity tester according to claim 1, wherein, One side of the test socket is correspondingly connected to 5 contacts of the gas relay to be tested through 5 connecting wires.

7. The gas relay contact capacity tester according to claim 1, characterized in that, Each of the contact switching relays is: a double-pole double-throw relay.

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