CN215575582U - Portable CT polarity calibration device - Google Patents
Portable CT polarity calibration device Download PDFInfo
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- CN215575582U CN215575582U CN202121351445.6U CN202121351445U CN215575582U CN 215575582 U CN215575582 U CN 215575582U CN 202121351445 U CN202121351445 U CN 202121351445U CN 215575582 U CN215575582 U CN 215575582U
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Abstract
The utility model relates to a portable CT polarity verifying device, which comprises: a housing; the pointer type ammeter is arranged on the shell, and the indicating surface of the pointer type ammeter is visibly arranged on the surface of the shell; the direct current power supply is arranged in the shell; the primary loop comprises a inching switch and a resetting switch and is electrically connected with the direct-current power supply; the inching switch is used for controlling the conduction of the primary loop, and the reset switch is used for controlling the disconnection of the primary loop; the secondary loop is connected with the pointer type ammeter; the secondary circuit is switched on when the primary circuit is switched on and switched off when the primary circuit is switched off. The portable CT polarity calibration device can save manpower, test results are more visual, double judgment of the polarity display self-holding indicator lamp and the pointer type ammeter is added, repeated tests are not needed, and the test period is saved; in addition, the device can be recycled, and test consumables are saved.
Description
Technical Field
The utility model relates to the field of electric power, in particular to a portable CT polarity checking device.
Background
The electric system CT (current transformer) loop is widely used in the measurement, measurement and protection loops of the electric system, bears the work of changing high voltage quantity into low voltage quantity, and is the most important component of relay protection. Whether the polarity of the CT is correct or not is directly related to the electric quantity calculation and the action is protected. Therefore, the CT polarity verification is important work for installation, debugging and maintenance of the electrical equipment, and the application of the utility model can effectively assist the field work of electrical testers.
In the current test, an electrical tester performs on-site CT polarity check, generally and temporarily adopts dry batteries to perform point polarity, one person is required to connect positive and negative electrode connecting wires of the dry batteries into a CT primary circuit on site, the other person short-circuits the positive and negative electrode connecting wires of the dry batteries and rapidly disconnects the positive and negative electrode connecting wires, and a third person holds a measuring meter by hand to measure the current of the secondary circuit and observes the display condition of the meter to judge whether the polarity is correct.
The work needs three persons at least, and the CT number in the electric system is very many, and install in different positions, for example above power transformer, and the space is narrow, can not hold three people, brings certain difficulty for CT polarity test verification. Meanwhile, the short circuit is needed for multiple times in the test process, the judgment can be carried out, the result is not visual enough, the temporary point polarity device is not easy to store, and the temporary point polarity device needs to be manufactured temporarily again when used next time, so that the field construction period is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a portable CT polarity checking device.
The technical scheme adopted by the utility model is as follows:
a portable CT polarity verification device, comprising:
a housing;
the pointer type ammeter is arranged on the shell, and the indicating surface of the pointer type ammeter is visibly arranged on the surface of the shell;
the direct current power supply is arranged in the shell;
the primary loop comprises a inching switch and a resetting switch and is electrically connected with the direct-current power supply; the inching switch is used for controlling the conduction of the primary loop, and the reset switch is used for controlling the disconnection of the primary loop;
the secondary loop is connected with the pointer type ammeter; the secondary circuit is switched on when the primary circuit is switched on and switched off when the primary circuit is switched off.
Preferably, the dc power supply is a dc rechargeable battery.
Preferably, the battery charging device further comprises a battery voltage display module and a battery charging port which are arranged on the surface of the shell, and the battery voltage display module and the battery charging port are connected with the direct-current rechargeable battery.
Preferably, the primary circuit further comprises a second relay, a first relay, and a primary winding; the positive electrode of the direct-current power supply is connected to the normally closed contact of the second relay and the normally open contact of the first relay; the normally closed contact of the second relay is connected to the normally closed contact of the first relay through the inching switch, and the normally open contact of the first relay is connected to the normally closed contact of the first relay through the reset switch; the normally closed contact of the first relay is connected to the end of the primary winding; and the negative electrode of the direct current power supply is connected to the other end of the primary winding.
Preferably, the secondary circuit comprises a secondary winding corresponding to the primary winding; the polarity end of the secondary winding is connected to the pointer type ammeter through a normally open contact of the second relay; the other end of the secondary winding is connected to the pointer type ammeter through a sliding resistor.
Preferably, the secondary circuit further comprises a polarity reducing branch, the polarity reducing branch is connected with the pointer type ammeter in parallel and comprises a first diode, a first indicator light and a first resistor; the positive electrode of the first diode is connected with the polarity end of the secondary winding, and the negative electrode of the first diode is connected with the first indicator lamp.
Preferably, the secondary circuit further comprises a polarity-adding branch, the polarity-adding branch is connected with the pointer type ammeter in parallel and comprises a second diode, a second indicator light and a second resistor; and the cathode of the second diode is connected with the polarity end of the secondary winding, and the anode of the second diode is connected with the second indicator light.
Preferably, the winding device further comprises a plurality of winding boxes corresponding to the primary winding and the secondary winding, wherein the winding boxes are arranged on the shell and used for controlling the lengths of the cables thrown into the primary loop and the secondary loop.
Preferably, the end of the cable is provided with a metal clip of a colour corresponding to its polarity.
Preferably, the click switch and the reset switch are arranged on the surface of the housing.
In summary, the portable CT polarity verification apparatus of the present embodiment has the following advantages:
1. the method saves manpower, at least three persons are needed for testing in the original checking method, one person is needed to connect the positive and negative connecting wires of the dry battery into a CT primary circuit, the other person is needed to short-circuit and rapidly disconnect the positive and negative connecting wires of the dry battery, and the third person holds the measuring meter by hand to measure the current of the secondary circuit and observes the display condition of the meter to judge whether the polarity is correct or not. By adopting the device, the check site placement equipment can be flexibly selected, and two persons can carry out the work.
2. The test result is more intuitive, double judgment of the polarity display self-holding indicator lamp and the pointer type ammeter is added, repeated tests are not needed, and the test period is shortened.
3. Can be recycled, and saves test consumables.
Drawings
Fig. 1 is a schematic structural diagram of a portable CT polarity verification apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of the primary circuit.
Fig. 3 is a schematic circuit diagram of the secondary circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a portable CT polarity verification apparatus, which includes:
a housing 10, wherein the housing 10 is used for bearing each module of the portable CT polarity verification apparatus and protecting each module. The housing 10 may be a plastic housing or a housing made of other materials, which is not limited in the utility model;
a pointer type ammeter 20 which is mounted on the housing 10 and whose indicating surface is visibly arranged on the surface of the housing 10;
a dc power supply 30 disposed in the housing 10;
a primary circuit 40 including a jog switch S1 and a reset switch S2, and electrically connected to the dc power supply 30; the inching switch S1 is used for controlling the conduction of the primary loop 40, and the reset switch S2 is used for controlling the disconnection of the primary loop;
a secondary circuit 50 connected to the pointer ammeter 20; the secondary circuit 50 is on when the primary circuit 40 is on and off when the primary circuit 40 is off.
According to an embodiment of the present invention, the dc power supply 30 may be a dc rechargeable battery, but may also be other types of dc power supplies, and the present invention is not limited in particular.
For the case of the dc rechargeable battery, the portable CT polarity verification apparatus further includes a battery voltage display module 31 and a battery charging port 32 disposed on the surface of the housing 10, and both the battery voltage display module 31 and the battery charging port 32 are connected to the dc rechargeable battery.
The battery voltage display module 31 can be used to display the current voltage of the dc rechargeable battery, and the battery charging port 32 is used to provide an interface for charging the dc rechargeable battery.
Referring to fig. 2, specifically, the primary circuit 40 further includes a second relay K2, a first relay K1, and a primary winding; the positive electrode of the direct-current power supply 30 is connected to the normally closed contact of the second relay K2 and the normally open contact of the first relay K1; the normally closed contact of the second relay K2 is connected to the normally closed contact of the first relay K1 through a jog switch S1, and the normally open contact of the first relay K1 is connected to the normally closed contact of the first relay K1 through a reset switch S2; the normally closed contact of the first relay K1 is connected to the polarity end P1 of the primary winding; the negative pole of the dc power supply 10 is connected to the other end P2 of the primary winding.
Specifically, referring to fig. 3, the secondary circuit 50 includes a secondary winding corresponding to the primary winding; the polarity end Q1 of the secondary winding is connected to the pointer type ammeter 10 through a normally open contact of the second relay K2; the other end Q2 of the secondary winding is connected to the pointer ammeter 20 through a sliding resistor R0.
In accordance with one embodiment of the present invention, the test begins when the jog switch S1 is pressed while the polarity check is performed. The jog switch S1 is momentary jog and is pressed to keep the primary circuit 40 conductive through the S2-K1 circuit. The first relay K1 makes the current of the primary loop 40 self-keeping conducting, which is convenient for the tester to observe the data.
After receiving the verification, the reset switch S2 is pressed, the first relay K1 of the primary loop 40 loses power, the normally open contact is disconnected, the primary loop 40 is disconnected, and the test is finished.
According to an embodiment of the present invention, when the primary circuit 40 starts to test the input current, the normally open contact of the second relay K2 of the secondary circuit 50 is closed, and the secondary circuit 50 is simultaneously conducted, so that the branch of the secondary circuit 50 where the pointer ammeter 20 is located is also conducted, and the pointer ammeter 20 will indicate the current according to the current direction and magnitude.
Wherein the pointer of the pointer ammeter 20 normally indicates the middle "0" scale. In the field test, after the inching switch S1 is pressed, if the CT is under polarity, the pointer is positively biased, and if the CT is under polarity, the pointer is negatively biased, so that the verification result can be visually seen.
It should be noted that, when currents with the same direction are simultaneously applied to the same-polarity ends of the primary and secondary windings, the directions of the magnetic fluxes generated in the iron core are the same. That is, when a current is introduced from the polarity terminal P1 of the primary winding, the current induced in the secondary winding flows out from the polarity terminal Q1, and the primary and secondary currents are opposite in direction with respect to the polarity terminal, so that the polarity decreasing standard is called. The current at the end of the same name of the current transformer specified in the above way flows in from the end of the same name as a power supply, and flows out from the end of the same name as a load at the other side according to the law of electromagnetic induction, so that the primary current and the secondary current are considered to be in phase in the marked current direction.
Some preferred embodiments of the utility model are described further below.
In the above embodiment, the verifier only views the deflection of the pointer during the polarity verification, and needs to keep high concentration due to short verification time, otherwise needs to repeat the test for many times to determine the polarity. For this reason, in the present embodiment:
the secondary circuit 50 further includes a polarity reducing branch, which is connected in parallel with the pointer ammeter 20 and includes a first diode D1, a first indicator light 51 and a first resistor R1; the anode of the first diode is connected with the polarity end Q1 of the secondary winding, and the cathode of the first diode is connected with the first indicator light 51.
The secondary circuit 50 further comprises a polarity-adding branch, which is connected in parallel with the pointer ammeter 20 and comprises a second diode D2, a second indicator light 52 and a second resistor R2; the cathode of the second diode D2 is connected to the polarity end Q1 of the secondary winding, and the anode is connected to the second indicator light 52.
In the present embodiment, the first indicator lamp 51 and the second indicator lamp 52 are self-holding, and when the switch S1 is pressed on site and the polarity is decreased, the pointer of the pointer ammeter 20 is biased forward, and the first indicator lamp 51 is normally on, and when the reset switch S2 is pressed, the first indicator lamp 51 is turned off. On the contrary, if the polarity is added, the pointer of the pointer ammeter 20 is reversely biased, and at the same time, the second indicator lamp 52 is normally on, and the second indicator lamp 52 is turned off after the reset switch S2 needs to be pressed. The self-holding indicator lamp is adopted, so that the polarity judgment of testers can be facilitated, the test times are reduced, and the test period is shortened.
Preferably, the winding device further comprises a plurality of winding boxes 60 corresponding to the primary winding and the secondary winding, wherein the winding boxes 60 are arranged on the shell and used for controlling the length of the cable thrown into the primary loop 40 and the secondary loop 50.
Wherein, the box 60 of coiling is used for depositing the wiring cable, utilizes the inside spring structure of box 60 of coiling to realize that the cable is automatic to contract and can fix arbitrary length, can place test device according to on-the-spot CT mounted position, does not receive the on-the-spot space restriction, is convenient for again daily depositing, and the on-the-spot quick wiring of being convenient for after stipulating the cable colour simultaneously practices thrift the time limit for a project. The ends of the cables are respectively provided with a red and black metal clamp, so that field wiring is facilitated.
In summary, the portable CT polarity verification apparatus of the present embodiment has the following advantages:
1. the method saves manpower, at least three persons are needed for testing in the original checking method, one person is needed to connect the positive and negative connecting wires of the dry battery into a CT primary circuit, the other person is needed to short-circuit and rapidly disconnect the positive and negative connecting wires of the dry battery, and the third person holds the measuring meter by hand to measure the current of the secondary circuit and observes the display condition of the meter to judge whether the polarity is correct or not. By adopting the device, the check site placement equipment can be flexibly selected, and two persons can carry out the work.
2. The test result is more intuitive, the dual judgment of the polarity display self-holding indicator lamp and the pointer type ammeter 20 is added, the test is not required to be carried out repeatedly, and the test period is shortened.
3. Can be recycled, and saves test consumables.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A portable CT polarity verification device, comprising:
a housing;
the pointer type ammeter is arranged on the shell, and the indicating surface of the pointer type ammeter is visibly arranged on the surface of the shell;
the direct current power supply is arranged in the shell;
the primary loop comprises a inching switch and a resetting switch and is electrically connected with the direct-current power supply; the inching switch is used for controlling the conduction of the primary loop, and the reset switch is used for controlling the disconnection of the primary loop;
the secondary loop is connected with the pointer type ammeter; the secondary circuit is switched on when the primary circuit is switched on and switched off when the primary circuit is switched off.
2. The portable CT polarity verification device of claim 1, wherein said dc power source is a dc rechargeable battery.
3. The portable CT polarity verification device of claim 2, further comprising a battery voltage display module and a battery charging port disposed on the surface of said housing, wherein said battery voltage display module and said battery charging port are connected to said dc rechargeable battery.
4. The portable CT polarity verification device of claim 1, wherein said primary loop further comprises a second relay, a first relay, and a primary winding; the positive electrode of the direct-current power supply is connected to the normally closed contact of the second relay and the normally open contact of the first relay; the normally closed contact of the second relay is connected to the normally closed contact of the first relay through the inching switch, and the normally open contact of the first relay is connected to the normally closed contact of the first relay through the reset switch; the normally closed contact of the first relay is connected to the end of the primary winding; and the negative electrode of the direct current power supply is connected to the other end of the primary winding.
5. The portable CT polarity verification device of claim 4, wherein the secondary loop includes a secondary winding corresponding to the primary winding; the polarity end of the secondary winding is connected to the pointer type ammeter through a normally open contact of the second relay; the other end of the secondary winding is connected to the pointer type ammeter through a sliding resistor.
6. The portable CT polarity verification device of claim 4, wherein the secondary loop further comprises a polarity reducing branch, the polarity reducing branch is connected in parallel with the pointer ammeter and comprises a first diode, a first indicator light and a first resistor; the positive electrode of the first diode is connected with the polarity end of the secondary winding, and the negative electrode of the first diode is connected with the first indicator lamp.
7. The portable CT polarity verification device of claim 6, wherein the secondary loop further comprises a polarity-adding branch, the polarity-adding branch is connected in parallel with the pointer ammeter and comprises a second diode, a second indicator light and a second resistor; and the cathode of the second diode is connected with the polarity end of the secondary winding, and the anode of the second diode is connected with the second indicator light.
8. The portable CT polarity verification apparatus according to claim 1, further comprising a plurality of winding boxes corresponding to the primary winding and the secondary winding, the winding boxes being disposed on the housing and controlling lengths of cables fed to the primary circuit and the secondary circuit.
9. The portable CT polarity verification device of claim 8, wherein the end of said cable is configured with a metal clip of a color corresponding to its polarity.
10. The portable CT polarity verification device of claim 1, wherein the jog switch and the reset switch are disposed on a surface of the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121351445.6U CN215575582U (en) | 2021-06-17 | 2021-06-17 | Portable CT polarity calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121351445.6U CN215575582U (en) | 2021-06-17 | 2021-06-17 | Portable CT polarity calibration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215575582U true CN215575582U (en) | 2022-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121351445.6U Active CN215575582U (en) | 2021-06-17 | 2021-06-17 | Portable CT polarity calibration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215575582U (en) |
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2021
- 2021-06-17 CN CN202121351445.6U patent/CN215575582U/en active Active
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