Device for testing open circuit protection performance of direct current filter

Abstract

The invention provides a testing device for circuit break protection performance of a direct current filter, and relates to the field of direct current filters. Comprising a box body and a box cover, an installation bottom frame is arranged on the inner side of the box body, a direct current filter is arranged in the middle of the upper end of the installation bottom frame, a digital bridge tester is arranged on the inner side of the box cover, connecting rods are arranged on the upper portions of the left end and the right end of the inner side of the installation bottom frame, and a plurality of wiring units are arranged on the outer sides of the connecting rods at equal intervals in a sliding mode. And each wiring unit comprises a second wire joint. The connector lugs arranged at the two ends of the connecting cable are electrically connected with the first wire connector and the second wire connector, and the second wire connector is in wire connection with the direct current filter through the metal patch panel, so that the digital bridge tester is in circuit communication with the direct current filter, the convenience in the circuit communication process is improved, and the reliability of the digital bridge tester is improved. And meanwhile, the box body and the box cover are arranged, so that the portable performance in the using process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of direct current filters, in particular to a device for testing the circuit breaker protection performance of a direct current filter. Background Art

[0002] DC filter is an important equipment in converter station. It is a filter mainly used to block and short-circuit AC signals. It can use capacitors for filtering to make the output waveform smoother, improve the withstand voltage by connecting capacitors in series, and increase the capacity in parallel to make the output DC more stable. DC filter is an important equipment in converter station. It is installed in parallel between the DC high-voltage bus and the neutral bus. It is the most effective means to suppress harmonics on the DC side of the high-voltage DC transmission system. DC filter is mainly composed of high-voltage capacitors, high-voltage reactors, low-voltage capacitors, low-voltage reactors and other components. From the protection object of DC filter, differential protection and detuning protection are set for the filter as a whole; unbalanced protection, overload protection and bridge differential overcurrent protection are set for high-voltage capacitors; inverse time overcurrent protection is set for high-voltage reactors; overload protection is set for low-voltage resistors / reactors.

[0003] After the DC filter is manufactured and used for a long time, it is necessary to conduct a circuit breaker protection performance test on the DC filter to ensure that the DC filter meets the production quality after manufacturing and to avoid degradation of the circuit protection performance after long-term use. Most of the existing DC filters are tested mainly through two methods: oscilloscope testing and circuit testing. The oscilloscope test is to judge whether the DC filter can work normally by observing the input and output waveforms of the DC filter, and the circuit test is to judge whether the DC filter can work normally by measuring the resistance, capacitance and inductance parameters of the DC filter.

[0004] In most existing circuit testing methods, a test device is connected to a DC filter terminal through an alligator clip to connect the circuit to measure resistance, capacitance and inductance parameters. However, the alligator clip has low stability after being clamped during use and is easy to fall off. Different connection methods need to be used between each terminal for testing, resulting in the need to remove and clamp the alligator clip and repeat multiple steps. After clamping, the position of the alligator clip needs to be adjusted to prevent it from falling off, which reduces the convenience of use. In addition, the test device is not convenient to carry, which reduces the convenience of testing the circuit breaker protection performance of the DC filter. It is necessary to design a test device for the circuit breaker protection performance of the DC filter to solve the above-mentioned problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a device for testing the circuit breaker protection performance of a DC filter, which solves the problems of low stability, easy falling off and inconvenience in the prior art of clamping by alligator clips.

[0006] To achieve the above purpose, the present invention is implemented by the following technical scheme: a test device for the circuit breaker protection performance of a DC filter, comprising a box body and a box cover, a mounting base is arranged on the inner side of the box body, a DC filter is arranged in the middle of the upper end of the mounting base, a digital bridge tester is arranged on the inner side of the box cover, connecting rods are arranged on the upper parts of the left and right ends of the inner side of the mounting base, and a plurality of wiring units are equidistantly slid on the outer side of the connecting rod; the wiring units all include second wire connectors, the output ends of the second wire connectors are fixedly connected with metal wiring disks, the middle parts of the metal wiring disks are arranged with circular grooves, the input ends of the second wire connectors are arranged with first clamping sleeves and second clamping sleeves, the middle parts of the first clamping sleeves are arranged with sliding grooves, and the middle parts of the outer ends of the first clamping sleeves are threadedly connected with locking bolts; the first clamping sleeves slide on the outer side of the connecting rod through the sliding grooves; a plurality of threaded terminals are equidistantly arranged on the bottoms of the left and right ends of the DC filter, and a plurality of first wire connectors are equidistantly arranged on the rear side of the digital bridge tester.

[0007] Preferably, a connecting cable is further included, wherein both ends of the connecting cable are provided with connection heads, and the connection heads are electrically connected to the first wire connector and the second wire connector respectively.

[0008] Preferably, a snap-fitting groove is provided in the middle of the upper end of the mounting base, fixing rods are fixedly connected to the front and rear sides of the upper end of the mounting base, and fixing holes are provided at the four corners of the snap-fitting groove.

[0009] Preferably, first side fixing plates are provided on both the left and right sides of the bottom of the DC filter, and locking nuts and washers are threadedly connected to the outer sides of the threaded terminals.

[0010] Preferably, fixing plates are provided at both ends of the connecting rod, and the outer side of the fixing plate is fixedly connected to the front and rear sides of the left and right ends of the upper inner side of the mounting base.

[0011] Preferably, buckles are provided at both left and right ends of the upper front side of the box body, and a handle is fixedly connected to the middle part of the upper end of the box cover.

[0012] Preferably, a second side fixing plate is disposed on both the left and right sides of the upper portion of the digital bridge tester, and the second side fixing plate is fixedly connected to the left and right ends of the inner side of the box cover, respectively.

[0013] Preferably, a plurality of connecting cables are provided and are respectively placed inside the box.

[0014] Preferably, the box body and the box cover are made of plastic material, the mounting base is made of stainless steel, the surface of the mounting base is provided with an insulating coating, and the connecting rod is made of plastic material.

[0015] Preferably, a method for using a test device for testing the circuit breaker protection performance of a DC filter comprises the following steps:

[0016] S1: When testing the circuit breaker protection performance of the DC filter, first open the box body and the box cover. Since the stainless steel mounting frame is counterweighted inside the box body, when the box cover is opened, the box cover and the digital bridge tester are in a horizontally opened state with the box body.

[0017] S2: Then take out several connection cables arranged inside the box, remove the locking nuts threadedly connected to several threaded terminals at the left and right ends of the DC filter, and place the DC filter on the mounting base so that the first side fixing plate is engaged with the inner side of the engaging groove;

[0018] S3: Next, slide a plurality of wiring units on the outside of the connecting rod, align the positions of the wiring units with the positions of the threaded terminals, and lock and fix the wiring units on the connecting rod by means of locking bolts;

[0019] S4: Further, the metal terminal plate is sleeved on the outer side of the threaded terminal through the circular groove, and a locking nut is installed to fix the metal terminal plate on the outer side of the threaded terminal;

[0020] S5: Connect the terminals at both ends of the connecting cable to the first wire connector and the second wire connector, test the resistance, capacitance and inductance of different threaded terminals, compare the test data with the existing data, and determine whether the circuit breaker protection performance of the DC filter is normal.

[0021] The present invention provides a device for testing the circuit breaker protection performance of a DC filter. It has the following beneficial effects:

[0022] 1. The present invention provides a box body and a box cover, and a digital bridge tester is fixedly arranged on the box cover, and the connecting cables are placed inside the box body. At the same time, the wiring unit is fixedly arranged on the mounting base, and the mounting base is placed inside the box body, thereby increasing the portability during use.

[0023] 2. The present invention electrically connects the wiring connectors provided at both ends of the connecting cable to the first wire connector and the second wire connector, and connects the second wire connector to the DC filter through a metal wiring board, so that the digital bridge tester and the DC filter are connected in circuit, and the resistance, capacitance and inductance parameters of the DC filter are tested. Different threaded terminals can be connected. For example, when testing the threaded terminals at the rear left end and the front right end of the DC filter, the wiring connectors at one end of the two connecting cables are plugged into the first wire connector provided on the digital bridge tester, and then the wiring connectors at the other ends are plugged into the second wire connectors at the rear left end and the front right end, thereby increasing the convenience of the circuit connection process and preventing them from falling off after plugging in.

[0024] 3. In the present invention, due to the different types of DC filters, the number of terminal blocks provided is also different. By providing a mounting frame inside the box body and connecting rods at the left and right ends of the inner side of the mounting frame, the terminal units are slidably provided on the outer sides of the connecting rods, and the number of terminal units can be increased or decreased to adapt to different types of DC filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the box body and box cover of the present invention in an unfolded state;

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the box body and the box cover of the present invention in a closed state;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the DC filter of the present invention;

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the digital bridge tester of the present invention;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the mounting base, the connecting rod and the wiring unit of the present invention;

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the wiring unit of the present invention;

[0031] Figure 7 It is a schematic diagram of the exploded three-dimensional structure of the wiring unit of the present invention;

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the connecting cable of the present invention.

[0033] Among them, 1. box body; 2. box cover; 3. mounting base; 301. snap-fit ​​groove; 302. fixing rod; 303. fixing hole; 4. DC filter; 401. threaded terminal; 402. locking nut; 403. gasket; 404. first side fixing plate; 5. digital bridge tester; 501. first wire connector; 502. second side fixing plate; 6. connecting rod; 601. fixing plate; 7. wiring unit; 701. second wire connector; 702. metal wiring plate; 703. circular groove; 704. first snap-fit ​​sleeve; 705. second snap-fit ​​sleeve; 706. sliding groove; 707. locking bolt; 8. handle; 9. buckle; 10. connecting cable; 1001. wiring head. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1:

[0036] Please see attached Figure 1 - Attachment Figure 8 The embodiment of the present invention provides a test device for the circuit breaker protection performance of a DC filter, comprising a box body 1 and a box cover 2. A mounting base 3 is arranged on the inner side of the box body 1, a DC filter 4 is arranged at the middle of the upper end of the mounting base 3, a digital bridge tester 5 is arranged on the inner side of the box cover 2, connecting rods 6 are arranged on the upper parts of the left and right ends of the inner side of the mounting base 3, and a plurality of wiring units 7 are equidistantly slidably arranged on the outer side of the connecting rod 6; the wiring units 7 each include a second wire connector 701, and the output end of the second wire connector 701 is fixedly connected to a metal wiring plate 702, and the metal wiring plate 70 2 is provided with a circular groove 703 in the middle, the input end position of the second wire connector 701 is provided with a first clamping sleeve 704 and a second clamping sleeve 705, the middle part of the first clamping sleeve 704 is provided with a sliding groove 706, and the middle part of the outer end of the first clamping sleeve 704 is threadedly connected with a locking bolt 707; the first clamping sleeve 704 slides on the outside of the connecting rod 6 through the sliding groove 706; the bottom of the left and right ends of the DC filter 4 are equidistantly provided with a plurality of threaded terminals 401, and the rear side of the digital bridge tester 5 is equidistantly provided with a plurality of first wire connectors 501.

[0037] Please see attached Figure 1 and attached Figure 8, and also includes a connecting cable 10, both ends of the connecting cable 10 are provided with wiring heads 1001, and the wiring heads 1001 are electrically connected to the first wire connector 501 and the second wire connector 701 respectively, so as to facilitate the circuit connection between the DC filter 4 and the digital bridge tester 5.

[0038] Please see attached Figure 5 A snap-fitting groove 301 is provided in the middle of the upper end of the mounting base 3, and fixing rods 302 are fixedly connected to the front and rear sides of the upper end of the mounting base 3. Fixing holes 303 are provided at the four corners of the snap-fitting groove 301. The DC filter 4 is snap-fitted and fixed through the snap-fitting groove 301 to increase stability. The entire mounting base 3, the connecting rod 6 and the wiring unit 7 can be pulled out of the box body 1 through the fixing rod 302, which is convenient for inspection, maintenance and installation.

[0039] Please see attached Figure 3 A first side fixing plate 404 is provided on the left and right sides of the bottom of the DC filter 4. The outer sides of the threaded terminals 401 are threadedly connected with locking nuts 402 and gaskets 403. The locking nuts 402 can stabilize the metal terminal plate 702 and prevent it from falling off. The gaskets 403 increase the protection of the DC filter 4 after the locking nuts 402 are locked.

[0040] Please see attached Figure 5 A fixing plate 601 is provided at both ends of the connecting rod 6, and the outer side of the fixing plate 601 is fixedly connected to the front and rear sides of the left and right ends of the upper inner side of the mounting base 3, respectively, so as to facilitate the fixing and connection of the connecting rod 6 to the upper inner side of the mounting base 3, and facilitate installation and disassembly.

[0041] Please see attached Figure 2 Buckles 9 are provided on the left and right ends of the upper front side of the box body 1, and a handle 8 is fixedly connected to the middle of the upper end of the box cover 2. When the box body 1 and the box cover 2 are closed, the buckle 9 is used to lock them together, and the handle 8 is used at the same time to increase the carrying performance of the box body 1 and the box cover 2.

[0042] Please see attached Figure 4 The upper left and right sides of the digital bridge tester 5 are both provided with second side fixing plates 502, and the second side fixing plates 502 are respectively fixedly connected to the inner left and right ends of the box cover 2, so as to facilitate the fixed installation of the digital bridge tester 5 and the box cover 2, and also facilitate disassembly.

[0043] Please see attached Figure 1 There are multiple connecting cables 10, which are placed inside the box 1 respectively. Multiple connecting cables 10 are convenient for different connection combinations, which increases the convenience during use, and can be directly placed inside the box 1 when not in use, which is easy to carry.

[0044] Please see attached Figure 1The box body 1 and the box cover 2 are made of plastic, the mounting base 3 is made of stainless steel, the surface of the mounting base 3 is provided with an insulating coating, and the connecting rod 6 is made of plastic. The box body 1, the box cover 2 and the connecting rod 6 made of plastic material, and the mounting base 3 with an insulating coating on the surface, the insulation setting will not affect the detection process, and the mounting base 3 made of stainless steel increases the counterweight of the box body 1. When the box cover 2 is opened, the whole composed of the box cover 2 and the digital bridge tester 5 is in a horizontally opened state with the box body 1, and will not tip over.

[0045] Embodiment 2:

[0046] Please see attached Figure 1 - Attachment Figure 8 A method for using a test device for a DC filter circuit breaker protection performance includes the following steps:

[0047] S1: When testing the circuit breaker protection performance of the DC filter 4, first open the box body 1 and the box cover 2. Since the mounting base frame 3 made of stainless steel is counterweighted inside the box body 1, when the box cover 2 is opened, the whole consisting of the box cover 2 and the digital bridge tester 5 is in a horizontally opened state with the box body 1;

[0048] S2: Then take out the several connection cables 10 arranged inside the box 1, remove the locking nuts 402 threadedly connected to the several threaded terminals 401 at the left and right ends of the DC filter 4, and place the DC filter 4 on the mounting base 3 so that the first side fixing plate 404 is engaged with the inner side of the engaging groove 301;

[0049] S3: Next, slide a plurality of wiring units 7 on the outside of the connecting rod 6, align the positions of the wiring units 7 with the positions of the threaded terminals 401, and lock and fix the wiring units 7 on the connecting rod 6 by means of the locking bolts 707;

[0050] S4: Further, the metal wiring plate 702 is sleeved on the outer side of the threaded terminal 401 through the circular groove 703, and the locking nut 402 is installed to fix the metal wiring plate 702 on the outer side of the threaded terminal 401;

[0051] S5: Connect the terminal heads 1001 provided at both ends of the connecting cable 10 with the first wire connector 501 and the second wire connector 701, test the resistance, capacitance and inductance of different threaded terminals 401, compare the test data with the existing data, and determine whether the circuit breaker protection performance of the DC filter 4 is normal.

[0052] By electrically connecting the terminal heads 1001 provided at both ends of the connecting cable 10 with the first wire connector 501 and the second wire connector 701, the digital bridge tester 5 is connected to the DC filter 4 in circuit, and the resistance, capacitance and inductance parameters of the DC filter 4 are tested. Different threaded terminals 401 can be connected. For example, when testing the threaded terminals 401 at the rear left end and the front right end of the DC filter 4, the terminal heads 1001 at one end of the two connecting cables 10 are plugged into the first wire connector 501 provided on the digital bridge tester 5, and then the terminal heads 1001 at the other end are plugged into the second wire connector 701 at the rear left end and the front right end, which increases the convenience of the circuit connection process and will not fall off after plugging.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the circuit breaker protection performance of a DC filter, comprising a box body (1) and a box cover (2), characterized in that: A mounting base (3) is arranged on the inner side of the box body (1), a DC filter (4) is arranged at the middle of the upper end of the mounting base (3), a digital bridge tester (5) is arranged on the inner side of the box cover (2), connecting rods (6) are arranged at the upper parts of the left and right ends of the inner side of the mounting base (3), and a plurality of wiring units (7) are equidistantly slidably arranged on the outer side of the connecting rod (6); The wiring units (7) each comprise a second wire connector (701), the output end of each second wire connector (701) is fixedly connected to a metal wiring plate (702), the middle of each metal wiring plate (702) is provided with a circular groove (703), the input end of each second wire connector (701) is provided with a first clamping sleeve (704) and a second clamping sleeve (705), the middle of each first clamping sleeve (704) is provided with a sliding groove (706), and the middle of the outer end of each first clamping sleeve (704) is threadedly connected to a locking bolt (707); The first clamping sleeves (704) slide on the outside of the connecting rod (6) through the sliding grooves (706); A plurality of threaded terminals (401) are equidistantly arranged at the bottom of the left and right ends of the DC filter (4), and a plurality of first wire connectors (501) are equidistantly arranged at the rear side of the digital bridge tester (5).

2. A DC filter circuit breaker protection performance testing device according to claim 1, characterized in that: It also comprises a connecting cable (10), both ends of which are provided with connection heads (1001), and the connection heads (1001) are respectively electrically connected to the first wire connector (501) and the second wire connector (701).

3. A test device for the circuit breaker protection performance of a DC filter according to claim 1, characterized in that: A snap-fitting groove (301) is provided in the middle of the upper end of the mounting base (3), and fixing rods (302) are fixedly connected to the front and rear sides of the upper end of the mounting base (3), and fixing holes (303) are provided at the four corners of the snap-fitting groove (301).

4. A test device for the circuit breaker protection performance of a DC filter according to claim 1, characterized in that: The left and right sides of the bottom of the DC filter (4) are both provided with first side fixing plates (404), and the outer sides of the threaded terminals (401) are both threadedly connected with locking nuts (402) and gaskets (403).

5. A test device for the circuit breaker protection performance of a DC filter according to claim 1, characterized in that: Fixed plates (601) are provided at both ends of the connecting rod (6), and the outer side of the fixed plate (601) is fixedly connected to the front and rear sides of the left and right ends of the upper inner side of the mounting base (3).

6. A device for testing the circuit breaker protection performance of a DC filter according to claim 1, characterized in that: Buckles (9) are provided at the left and right ends of the upper front part of the box body (1), and a handle (8) is fixedly connected to the middle part of the upper end of the box cover (2).

7. A device for testing the circuit breaker protection performance of a DC filter according to claim 1, characterized in that: Second side fixing plates (502) are provided on both the left and right sides of the upper part of the digital bridge tester (5), and the second side fixing plates (502) are respectively fixedly connected to the left and right ends of the inner side of the box cover (2).

8. A test device for the circuit breaker protection performance of a DC filter according to claim 2, characterized in that: A plurality of connection cables (10) are provided and are respectively placed inside the box (1).

9. A device for testing the circuit breaker protection performance of a DC filter according to claim 1, characterized in that: The box body (1) and the box cover (2) are made of plastic material, the mounting base (3) is made of stainless steel material, the surface of the mounting base (3) is provided with an insulating coating, and the connecting rod (6) is made of plastic material.

10. A method for using a device for testing the circuit breaker protection performance of a DC filter according to any one of claims 1 to 9, characterized in that: The usage steps include the following: S1: When testing the circuit breaker protection performance of the DC filter (4), the box body (1) and the box cover (2) are first opened. Since the mounting base frame (3) made of stainless steel is counterweighted inside the box body (1), when the box cover (2) is opened, the box cover (2) and the digital bridge tester (5) are in a horizontally opened state with the box body (1); S2: Then, take out a plurality of connection cables (10) arranged inside the box (1), remove the locking nuts (402) threadedly connected to a plurality of threaded terminals (401) at the left and right ends of the DC filter (4), place the DC filter (4) on the mounting base (3), and make the first side fixing plate (404) engage with the inner side of the engaging groove (301); S3: Next, a plurality of wiring units (7) are slid on the outside of the connecting rod (6), the positions of the wiring units (7) are aligned with the positions of the threaded terminals (401), and the wiring units (7) are locked and fixed on the connecting rod (6) by means of locking bolts (707); S4: Further, the metal wiring plate (702) is sleeved on the outer side of the threaded terminal (401) through the circular groove (703), and the locking nut (402) is installed to fix the metal wiring plate (702) on the outer side of the threaded terminal (401); S5: Connecting the connection heads (1001) provided at both ends of the connection cable (10) to the first wire connector (501) and the second wire connector (701), testing the resistance, capacitance and inductance of different threaded terminals (401), comparing the test data with the existing data, and determining whether the circuit breaker protection performance of the DC filter (4) is normal.

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