CN110286295B - Direct current feed screen branch CT polarity testing device and method - Google Patents
Direct current feed screen branch CT polarity testing device and method Download PDFInfo
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- CN110286295B CN110286295B CN201910394764.6A CN201910394764A CN110286295B CN 110286295 B CN110286295 B CN 110286295B CN 201910394764 A CN201910394764 A CN 201910394764A CN 110286295 B CN110286295 B CN 110286295B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
The invention relates to the technical field of power equipment, in particular to a direct-current feed screen branch CT polarity testing device which comprises a shell, a two-way switch ZKK, a resistor R1, an indicator lamp LM1, an ammeter A1 and an ammeter A2, wherein the input end of the two-way switch ZKK is connected with a branch, the first output end of the two-way switch ZKK is connected with the first end of the indicator lamp LM1 and the second end of the resistor R1, the first end of the resistor R1 is connected with the anode of the ammeter A1, the cathode of the ammeter A1 is connected with the second end of the indicator lamp LM1 and the second output end of the two-way switch ZKK, and the two ends of the ammeter A2 are respectively connected with the output end of a. A method for testing the CT polarity of a branch of a direct-current feed screen comprises the following steps: A) the two-way switch ZKK is connected with the branch circuit, and the ammeter A2 is connected with the secondary coil of the CT; B) the two-way switch ZKK is immediately switched off after being closed, and the CT polarity is judged according to the current directions measured by an ammeter A1 and an ammeter A2; C) and C, executing the steps A to B to all the branches in the direct current feed screen to obtain the CT polarities of all the branches.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a direct current feed screen branch CT polarity testing device and method.
Background
With the rapid development of an electric power system, the safe operation of a transformer substation is related to the safety and stability of national social and economic, a voltage transformer (PT) and a Current Transformer (CT) are important electric equipment of the electric power system, and bear the functions of isolation between a high-voltage system and a low-voltage system and conversion from high-voltage quantity to low-voltage quantity, and the wiring of the voltage transformer (PT) and the Current Transformer (CT) is correct or not, so that the PT and the CT are of great significance for the normal work of equipment for protection, measurement, monitoring and the like of the system. When the direct current two-point grounding occurs, the power supply fuse is fused, a relay node is burnt out, the relay protection is refused to operate or is operated mistakenly, and the safe and stable operation of the power system is seriously influenced. However, the insulation monitoring device requires that the polarity of each CT is consistent.
The insulation monitoring device is added with an alternating current series connection direct current system alarm, and the premise of realizing the function is that the polarity of the CT is ensured to be the same polarity. When the polarity of the CT is judged by adopting a battery method, a wire needs to be penetrated into the CT, the space in a screen is narrow, and the arrangement of a feeder line is compact and cannot be carried out; even if the space in the screen is large enough, the possibility of personal electric shock exists, and after field test, the current method is not suitable for checking the CT polarity on most feed screens in the transformer substation.
For example, chinese patent CN104237733B, published 2017, 11, 17, a CT polarity tester, comprising: the device comprises a power supply circuit, a voltage stabilizing circuit, an output circuit and an infrared remote control circuit; wherein, power supply circuit includes: the solar cell panel and the storage battery are connected in series; the positive pole and the negative pole of the storage battery are connected to the output circuit; the output circuit includes: the first connecting line is connected with the anode of the storage battery and comprises a first anode wire outlet end and a second anode wire outlet end which are connected in parallel, and the second connecting line comprises a first cathode wire outlet end; two ends of the voltage stabilizing circuit are respectively connected with a first connecting wire and a second connecting wire; the infrared remote control circuit is connected to the output circuit. The technical scheme can form stable input voltage and obtain accurate test results. But it is not suitable for occasions with narrow operation space, such as a direct current feed screen.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical problem that the CT polarity test of the direct current feed screen branch is slow and low in efficiency at present is solved. The device and the method for testing the polarity of the CT of the branch circuit of the direct current feed screen are more convenient and quicker to test when the instantaneous load is connected.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a direct current feed screen branch circuit CT polarity testing arrangement, a polarity for the CT of calibration insulation monitoring device, which comprises a housin, double-circuit switch ZKK, resistance R1, pilot lamp LM1, ampere meter A1 and ampere meter A2, double-circuit switch ZKK's first input and branch circuit positive pole are connected, double-circuit switch ZKK second input and branch circuit negative pole are connected, the first output of double-circuit switch ZKK is connected with pilot lamp LM1 first end and resistance R1 second end, resistance R1 first end and ampere meter A1 positive pole are connected, ampere meter A1 negative pole and pilot lamp LM1 second end and double-circuit switch ZKK second output are connected, ampere meter A2 both ends are connected with the secondary coil output of CT respectively, double-circuit switch ZKK, pilot lamp LM1, ampere meter A1 and ampere meter A2 all install on the casing, ampere meter A1 and ampere meter A2 are the ampere meters that have the direction of instruction current function. The test wire is directly connected to the outgoing line of the CT secondary coil, and the CT polarity can be checked only on the outgoing line side of the feeder line without penetrating through the CT by using a current deflection method, so that the CT polarity test efficiency and the CT polarity test safety in the direct-current feed screen are greatly improved. If the outgoing CT polarity is connected reversely, the bidirectional direct current ammeter is adopted to sensitively react and prevent the measuring meter from being damaged, and the reliability of the device is improved.
Preferably, the device also comprises a first touch plate, a second touch plate, a resistor R3, a resistor R4, a sliding rod, an insulating rod, a magnet, a magnetic ring and a spring, wherein a hole for penetrating out the second end of the insulating rod is formed in the side surface of the shell, the first end of the insulating rod is fixedly connected with the second end of the sliding rod in a concentric mode, the spring is sleeved on the insulating rod, the first end of the spring is fixedly connected with and electrically communicated with the second end of the sliding rod, the diameter of the sliding rod is larger than that of the insulating rod, a sliding seat sleeved with the sliding rod is arranged in the shell, the magnet is fixed on the sliding rod, the first touch plate is positioned on the side surface of the first end of the sliding rod and is abutted against the sliding rod, the second touch plate is positioned between the first touch plate and the magnet and is abutted against the sliding rod, the magnet is positioned between the second touch plate and the magnetic ring, the magnetic pole direction of the magnet and the magnetic ring are the, when the magnet is attracted with the magnetic ring, the sliding rod is separated from the first touch plate, the first touch plate is connected with the second end of the ammeter A1 and the second end of the indicator light LM1, the second touch plate is connected with the second end of the resistor R3, the second end of the resistor R4 is connected with the second end of the spring, and the first ends of the resistor R3 and the resistor R4 are both connected with the second output end of the double-way switch ZKK. The working method of the preferred scheme comprises the following steps: when the two-way switch ZKK is closed, current respectively passes through the resistor R1, the ammeter A1 and the indicator light LM1 and then is collected to the first touch plate, the first touch plate is in contact with the slide bar, the current is divided into two paths after passing through the slide bar, the first path passes through the second touch plate and the resistor R3, the second path passes through the spring and the resistor R4 and then returns to the negative pole of the branch circuit through the two-way switch ZKK, the second path of current enables the spring to contract to drive the slide bar to slide and is separated from the contact with the first touch plate, all current is cut off, the magnet and the magnetic ring are attracted with each other, and after the current disappears and the spring elasticity recovers, the slide bar. After the test is finished, the insulating rod is manually pushed to separate the magnet from the magnetic ring, so that preparation is made for the next test.
Preferably, the LED lamp further comprises a switch S and a resistor R2, wherein the second end of the resistor R1 is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the first end of the indicator light LM1 and the first output end of the two-way switch ZKK, the switch S is connected with the resistor R2 in parallel, and the switch S is installed on the shell. The sensitivity of the testing device can be changed through the switch S and the resistor R2, and the testing device is suitable for branches with different voltage levels.
Preferably, ammeter a1 and ammeter a2 are both pointer ammeters. The pointer swing direction of the pointer type ammeter represents the current direction, and the observation is visual.
Preferably, the center of the second end of the sliding rod is provided with a blind hole for accommodating the first end of the insulating rod, a threaded hole is processed on the side surface of the sliding rod close to the second end, the second blind hole is processed at the second end of the insulating rod, the second hole is aligned with the threaded hole, the diameter of the second blind hole is larger than that of the threaded hole, a fastening screw is screwed into the threaded hole, and the second end of the insulating rod is provided with an extension part extending along the radial direction. The insulating rod and the sliding rod are disassembled and installed quickly, and the testing device is convenient to assemble.
Preferably, the pitch of the spring is greater than the wire diameter but less than twice the wire diameter. The magnetic field generated by the spring wire can be effectively utilized, and the electrified contraction speed of the spring is increased.
Preferably, the device also comprises a first touch panel, a second touch panel, a resistor R3, a resistor R4, a sliding rod, an insulating rod, a buckle and a spring, wherein a supporting wall for clamping the insulating rod is arranged in the shell, the first end of the insulating rod is fixedly connected with the second end of the sliding rod in a concentric manner, the spring is sleeved on the insulating rod and is positioned between the supporting wall and the sliding rod, the first end of the spring is fixedly connected with and electrically communicated with the second end of the sliding rod, the diameter of the sliding rod is larger than that of the insulating rod, a sliding seat for sleeving the sliding rod is arranged in the shell, a stop block is arranged in the middle of the sliding rod, the buckle is movably connected with the shell and is positioned above the sliding rod, the buckle stroke is radial along the sliding rod, the first end of the buckle penetrates out of the shell, a notch matched with the second end of the buckle is arranged between the second end of the sliding rod and the stop block, the first touch panel is positioned on the, slide bar and first touch panel butt when dog and second touch panel contact, when buckle and breach butt, the slide bar breaks away from the contact with first touch panel, and first touch panel is connected with ampere meter A1 second end and pilot lamp LM1 second end, and the second touch panel is connected with resistance R3 second end, and resistance R4 second end is connected with the spring second end, and resistance R3 and resistance R4 first end all are connected with double-circuit switch ZKK second output. When the two-way switch ZKK is closed, current passes through the spring, the spring contracts to drive the slide bar to separate from the first touch plate, the buckle is buckled with the slide bar to generate transient current for CT polarity test, and after the test is finished, the buckle is lifted upwards to restore the contact between the slide bar and the first touch plate, so that preparation is made for the next test.
Preferably, the buckle has magnetism, the sliding rod is a magnetic conductor, and the first end of the buckle is provided with a bending part. The buckle is convenient to lift.
A DC feed screen branch CT polarity test method is suitable for the DC feed screen branch CT polarity test device, and comprises the following steps: A) the input end of a two-way switch ZKK is respectively connected with the positive pole and the negative pole of a branch circuit, and the two ends of an ammeter A2 are respectively connected with the output end of a secondary coil of the CT; B) closing the two-way switch ZKK, immediately opening the two-way switch ZKK after the indicator light is on, if the directions of currents measured by the ammeter A1 and the ammeter A2 are the same, judging that the polarity of the CT is positive, otherwise, judging that the polarity of the CT is negative; C) executing steps A to B on all branches in the direct current feed screen; D) if the CT polarities of all the branches are the same, the CT polarities of the insulation monitoring devices connected with the branches in the direct current feed screen are consistent; if the branches in the direct current feed screen have two CT polarities, the branches are grouped according to the CT polarities, the group with the smaller number of branches is subjected to the step A-B, the positive and negative connection method of the ammeter A2 is changed, and after re-detection is carried out, the CT polarities of the insulation monitoring devices connected with the branches in the direct current feed screen are consistent, and the CT polarities of the branches in the group with the smaller number of branches are judged to need to be adjusted.
The substantial effects of the invention are as follows: the load is connected and then quickly cut off, alternating current components are formed in the branch circuits, and the polarity of the CT can be judged according to the direction of current generated by the CT secondary coil; when the two-way switch ZKK is connected, a part of current passes through the spring, so that the spring contracts, the slide bar is pulled to be separated from the contact with the first contact plate, the load is automatically and rapidly cut off, an instantaneous alternating current component is generated for CT polarity test, and the test operation steps are simplified.
Drawings
Fig. 1 is a schematic structural diagram of a housing according to an embodiment.
FIG. 2 is a schematic circuit diagram according to an embodiment.
FIG. 3 is a schematic structural diagram of the second embodiment.
FIG. 4 is a schematic diagram of the third embodiment.
Wherein: 1. casing, 2, CT terminal, 3, branch terminal, 4, branch anodal, 5, branch negative pole, 6, CT, 7, insulation monitoring devices, 8, insulator spindle, 9, spring, 10, first touch panel, 11, slide bar, 12, second touch panel, 13, magnet, 14, magnetic ring, 15, buckle, 16, backup wall, 17, dog.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
A polarity testing device of a direct current feed screen branch CT6 is used for calibrating the polarity of a CT6 of an insulation monitoring device 7, as shown in FIG. 1, the embodiment includes a housing 1, a two-way switch ZKK, a resistor R1, an indicator light LM1, an ammeter A1 and an ammeter A2, the housing 1 is provided with a CT terminal 2 and a branch terminal 3, the branch terminal 3 is connected with a branch positive electrode 4 and a branch negative electrode 5 through a patch cord, the CT terminal 2 is connected with a secondary coil output end of a CT6 through a patch cord, as shown in FIG. 2, a first input end of the two-way switch ZKK is connected with the branch positive electrode 4, a second input end of the two-way switch ZKK is connected with the branch negative electrode 5, a first output end of the two-way switch ZKK is connected with a first end of an indicator light LM1 and a second end of a resistor R1, a first end of the resistor R1 is connected with a positive electrode of the ammeter A1, an ammeter A1 is connected with a second, the two ends of an ammeter A2 are respectively connected with the output end of a secondary coil of a CT6, a two-way switch ZKK, an indicator light LM1, an ammeter A1 and an ammeter A2 are all installed on the shell 1, and the ammeter A1 and the ammeter A2 are all ammeters with the function of indicating the current direction. The second end of the resistor R1 is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the first end of the indicator light LM1 and the first output end of the two-way switch ZKK, the switch S is connected with the resistor R2 in parallel, and the switch S is installed on the shell 1. The two-way switch ZKK is an air switch. The test wire is directly connected to the outgoing line of the secondary coil of the CT6, and the polarity of the CT6 can be checked only by the current deflection method on the outgoing line side of the feeder line without passing through the CT6, so that the polarity test efficiency and the safety of the CT6 in the direct-current feed screen are greatly improved. If the polarity of the outgoing CT6 is reversed, the bidirectional direct current ammeter can sensitively react without damaging the meter of the measuring meter, and the reliability of the device is improved. The sensitivity of the testing device can be changed through the switch S and the resistor R2, and the testing device is suitable for branches with different voltage levels. Both ammeter A1 and ammeter A2 are pointer ammeters. The pointer swing direction of the pointer type ammeter represents the current direction, and the observation is visual.
A polarity test method for a direct current feed screen branch CT6 is suitable for the direct current feed screen branch CT6 polarity test device, and comprises the following steps: A) the input end of a two-way switch ZKK is respectively connected with the positive pole 4 and the negative pole of the branch circuit, and the two ends of an ammeter A2 are respectively connected with the output end of a secondary coil of the CT 6; B) closing the two-way switch ZKK, immediately disconnecting the two-way switch ZKK after the indicator light is on, if the directions of currents measured by the ammeter A1 and the ammeter A2 are the same, judging that the polarity of the CT6 is positive, otherwise, judging that the polarity of the CT6 is negative; C) executing steps A to B on all branches in the direct current feed screen; D) if the polarities of the CTs 6 of all the branches are the same, the polarities of the CTs 6 of the insulation monitoring devices 7 connected to the branches in the dc feed screen are the same; if the branches in the direct current feed screen have two CT6 polarities, the branches are grouped according to the CT6 polarity, the step A-B is repeated for the group with the smaller number of branches, the positive and negative connection method of the ammeter A2 is changed, and if the CT6 polarities of the insulation monitoring devices 7 connected with the branches in the direct current feed screen are consistent after re-detection, the CT6 polarities of the branches in the group with the smaller number of branches are judged to need to be adjusted.
Example two:
in the first embodiment, the two-way switch ZKK needs to be manually disconnected, the operation is cumbersome, the present embodiment is further improved, the current path can be automatically cut off after the two-way switch ZKK is closed, and the detection operation is simplified, as shown in fig. 3, in the present embodiment, a hole for penetrating the second end of the insulating rod 8 is formed in the side surface of the housing 1, the first end of the insulating rod 8 is concentrically and fixedly connected with the second end of the sliding rod 11, a blind hole for accommodating the first end of the insulating rod 8 is formed in the center of the second end of the sliding rod 11, a threaded hole is processed in the side surface of the sliding rod 11 close to the second end, a second blind hole is processed at the second end of the insulating rod 8, the second hole is aligned with the threaded hole, the diameter of the second blind hole is larger than the threaded hole, a fastening screw. A spring 9 is sleeved on an insulating rod 8, a first end of the spring 9 is fixedly connected with and electrically conducted with a second end of a sliding rod 11, the diameter of the sliding rod 11 is larger than that of the insulating rod 8, a sliding seat sleeved with the sliding rod 11 is arranged in a shell 1, a magnet 13 is fixed on the sliding rod 11, a first contact plate 10 is positioned on the side surface of the first end of the sliding rod 11 and abutted to the sliding rod 11, a second contact plate 12 is positioned between the first contact plate 10 and the magnet 13 and abutted to the sliding rod 11, the magnet 13 is positioned between the second contact plate 12 and a magnetic ring 14, the magnetic poles of the magnet 13 and the magnetic ring 14 are in the same direction and are in the stroke direction of the sliding rod 11, the first contact plate 10, the second contact plate 12 and the magnetic ring 14 are all fixedly connected with the shell 1, the sliding rod 11 is abutted to the first contact plate 10 when the magnet 13 is in contact with the second contact plate 12, the sliding rod 11 is separated from the first contact plate 10 when the magnet 13 is attracted to the, the second touch panel 12 is connected with a second end of the resistor R3, a second end of the resistor R4 is connected with a second end of the spring 9, and first ends of the resistor R3 and the resistor R4 are connected with a second output end of the two-way switch ZKK. The working method of the preferred scheme comprises the following steps: when the two-way switch ZKK is closed, current respectively passes through the resistor R1, the ammeter A1 and the indicator light LM1 and then is collected to the first touch panel 10, the first touch panel 10 is in contact with the slide bar 11, the current is divided into two paths after passing through the slide bar 11, the first path passes through the second touch panel 12 and the resistor R3, the second path passes through the spring 9 and the resistor R4 and then returns to the branch negative electrode 5 through the two-way switch ZKK, the second path of current enables the spring 9 to contract to drive the slide bar 11 to slide and is separated from contact with the first touch panel 10, all current is cut off, the magnet 13 and the magnetic ring 14 attract each other, and the return of the slide bar 11 is prevented after the current disappears and the elastic force of the spring 9. The pitch of the spring 9 is larger than the wire diameter but smaller than twice the wire diameter. When the test is finished, the insulating rod 8 is manually pushed to separate the magnet 13 from the magnetic ring 14, so as to prepare for the next test. The rest of the structure is the same as the first embodiment.
Example three:
in this embodiment, as shown in fig. 4, there is provided another solution having the same function as the second embodiment, in this embodiment, a supporting wall 16 for clamping the insulating rod 8 is provided in the housing 1, a first end of the insulating rod 8 is fixedly connected to a second end of the sliding rod 11 concentrically, the spring 9 is sleeved on the insulating rod 8 and is located between the supporting wall 16 and the sliding rod 11, a first end of the spring 9 is fixedly connected to and electrically communicated with the second end of the sliding rod 11, a diameter of the sliding rod 11 is larger than that of the insulating rod 8, a sliding seat for sleeving the sliding rod 11 is provided in the housing 1, a stopper 17 is provided in a middle of the sliding rod 11, a buckle 15 is movably connected to the housing 1 and located above the sliding rod 11, a stroke of the buckle 15 is along a radial direction of the sliding rod 11, a first end of the buckle 15 penetrates through the housing 1, the buckle 15 has magnetism, the sliding rod 11 is a magnetic, first touch panel 10 is located slide bar 11 first end side and with slide bar 11 butt, second touch panel 12 is located between first touch panel 10 and the dog 17 and with slide bar 11 butt, first touch panel 10 and second touch panel 12 all with casing 1 fixed connection, slide bar 11 and first touch panel 10 butt when dog 17 and second touch panel 12 contact, when buckle 15 and breach butt, slide bar 11 and first touch panel 10 break away from the contact, first touch panel 10 is connected with ampere meter A1 second end and pilot lamp LM1 second end, second touch panel 12 is connected with resistance R3 second end, resistance R4 second end is connected with spring 9 second end, resistance R3 and resistance R4 first end all are connected with double-circuit switch ZKK second output. When the two-way switch ZKK is closed, current passes through the spring 9, the spring 9 contracts to drive the sliding rod 11 to separate from the first touch plate 10, the buckle 15 is buckled with the sliding rod 11 to generate transient current for CT6 polarity test, and after the test is finished, the buckle 15 is lifted upwards to restore the sliding rod 11 to contact with the first touch plate 10 to prepare for the next test. The rest of the structure is the same as the first embodiment.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (6)
1. A DC feed screen branch CT polarity test device is used for calibrating the polarity of the CT of an insulation monitoring device and is characterized in that,
the three-way switch comprises a shell, a two-way switch ZKK, a resistor R1, an indicator lamp LM1, an ammeter A1 and an ammeter A2, a first input end of the two-way switch ZKK is connected with a branch anode, a second input end of the two-way switch ZKK is connected with a branch cathode, a first output end of the two-way switch ZKK is connected with a first end of the indicator lamp LM1 and a second end of the resistor R1, a first end of the resistor R1 is connected with an anode of the ammeter A1, a cathode of the ammeter A1 is connected with a second end of the indicator lamp LM1 and a second output end of the two-way switch ZKK, two ends of the ammeter A2 are respectively connected with a secondary coil output end of a CT, and the two-way switch ZKK, the indicator lamp LM1, the ammeter A36;
the magnetic field sensor also comprises a first touch plate, a second touch plate, a resistor R3, a resistor R4, a sliding rod, an insulating rod, a magnet, a magnetic ring and a spring, wherein a hole for the second end of the insulating rod to penetrate out is formed in the side surface of the shell, the first end of the insulating rod is fixedly connected with the second end of the sliding rod in a concentric mode, the spring is sleeved on the insulating rod, the first end of the spring is fixedly connected with the second end of the sliding rod and is electrically conducted with the second end of the sliding rod, the diameter of the sliding rod is larger than that of the insulating rod, a sliding seat sleeved with the sliding rod is arranged in the shell, the magnet is fixed on the sliding rod, the first touch plate is positioned on the side surface of the first end of the sliding rod and is abutted against the sliding rod, the magnet is positioned between the second touch plate and the magnetic ring, the magnetic pole direction of the magnet and the magnetic ring are the same and are along the stroke direction of the sliding rod, the first touch plate, the second touch plate and the magnetic ring, first touch panel and ampere meter A1 second end and pilot lamp LM1 second end are connected, and the second touch panel is connected with resistance R3 second end, and resistance R4 second end is connected with the spring second end, and resistance R3 and resistance R4 first end all are connected with double-circuit switch ZKK second output.
2. The DC feed screen branch CT polarity test device of claim 1,
still include switch S and resistance R2, resistance R1 second end is connected with the first end of resistance R2, and resistance R2 second end is connected with pilot lamp LM1 first end and the first output of double-circuit switch ZKK, and switch S and resistance R2 are parallelly connected, and switch S installs on the casing.
3. The DC feed screen branch CT polarity test device of claim 1,
both ammeter A1 and ammeter A2 are pointer ammeters.
4. The DC feed screen branch CT polarity test device of claim 1,
the pitch of the spring is greater than the wire diameter but less than twice the wire diameter.
5. A DC feed screen branch CT polarity test device is used for calibrating the polarity of the CT of an insulation monitoring device and is characterized in that,
the three-way switch comprises a shell, a two-way switch ZKK, a resistor R1, an indicator lamp LM1, an ammeter A1 and an ammeter A2, a first input end of the two-way switch ZKK is connected with a branch anode, a second input end of the two-way switch ZKK is connected with a branch cathode, a first output end of the two-way switch ZKK is connected with a first end of the indicator lamp LM1 and a second end of the resistor R1, a first end of the resistor R1 is connected with an anode of the ammeter A1, a cathode of the ammeter A1 is connected with a second end of the indicator lamp LM1 and a second output end of the two-way switch ZKK, two ends of the ammeter A2 are respectively connected with a secondary coil output end of a CT, and the two-way switch ZKK, the indicator lamp LM1, the ammeter A36;
the insulating rod clamping device comprises a shell, a first contact plate, a second contact plate, a resistor R3, a resistor R4, a sliding rod, an insulating rod, a buckle and a spring, wherein a supporting wall used for clamping the insulating rod is arranged in the shell, the first end of the insulating rod is fixedly connected with the second end of the sliding rod in a concentric mode, the spring is sleeved on the insulating rod and is positioned between the supporting wall and the sliding rod, the first end of the spring is fixedly connected with the second end of the sliding rod and is electrically communicated with the second end of the sliding rod, the diameter of the sliding rod is larger than that of the insulating rod, a sliding seat sleeved with the sliding rod is arranged in the shell, a stop block is arranged in the middle of the sliding rod, the buckle is movably connected with the shell and is positioned above the sliding rod, the buckle stroke is radial along the sliding rod, the first end of the buckle penetrates out of the shell, a notch matched with the second end of the buckle is arranged between the second end of the, slide bar and first touch panel butt when dog and second touch panel contact, when buckle and breach butt, the slide bar breaks away from the contact with first touch panel, and first touch panel is connected with ampere meter A1 second end and pilot lamp LM1 second end, and the second touch panel is connected with resistance R3 second end, and resistance R4 second end is connected with the spring second end, and resistance R3 and resistance R4 first end all are connected with double-circuit switch ZKK second output.
6. A DC feed screen branch CT polarity test method is suitable for the DC feed screen branch CT polarity test device according to any one of claims 1 to 5,
the method comprises the following steps:
A) the input end of a two-way switch ZKK is respectively connected with the positive pole and the negative pole of a branch circuit, and the two ends of an ammeter A2 are respectively connected with the output end of a secondary coil of the CT;
B) closing the two-way switch ZKK, immediately opening the two-way switch ZKK after the indicator light is on, if the directions of currents measured by the ammeter A1 and the ammeter A2 are the same, judging that the polarity of the CT is positive, otherwise, judging that the polarity of the CT is negative;
C) executing steps A to B on all branches in the direct current feed screen;
D) if the CT polarities of all the branches are the same, the CT polarities of the insulation monitoring devices connected with the branches in the direct current feed screen are consistent; if the branches in the direct current feed screen have two CT polarities, the branches are grouped according to the CT polarities, the group with the smaller number of branches is subjected to the step A-B, the positive and negative connection method of the ammeter A2 is changed, and after re-detection is carried out, the CT polarities of the insulation monitoring devices connected with the branches in the direct current feed screen are consistent, and the CT polarities of the branches in the group with the smaller number of branches are judged to need to be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910394764.6A CN110286295B (en) | 2019-05-13 | 2019-05-13 | Direct current feed screen branch CT polarity testing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910394764.6A CN110286295B (en) | 2019-05-13 | 2019-05-13 | Direct current feed screen branch CT polarity testing device and method |
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| Publication Number | Publication Date |
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| CN110286295A CN110286295A (en) | 2019-09-27 |
| CN110286295B true CN110286295B (en) | 2021-07-06 |
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