Portable rechargeable current transformer polarity verification device

Abstract

The utility model provides a portable rechargeable current transformer polarity verification device, which comprises a verification device, and the verification device comprises an SB test button, a QF power switch, a DC storage battery pack, a current type relay, a contact of the current type relay, a resistor, a polarity indicating lamp, a diode and other electronic components which form a primary side test loop. A connection panel is arranged on the front surface of the verification device; during charging, after an external power supply is switched on, the DC storage battery pack is charged through the charging loop; during detection, the QF power switch is switched on, the SB test button is pressed down, the DC storage battery pack generates primary current on the primary side test loop and generates induction current on the secondary side, and the induction current generates conduction of diodes in different directions in the secondary side test loop to form a loop to trigger the corresponding polarity indicating lamps to be lightened to judge the polarity. According to the utility model, the polarity verification work of the current transformer is more convenient, the test efficiency is improved, and the intuition of the test result is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical engineering, in particular to a portable and rechargeable current transformer polarity calibration device. Background Art

[0002] The commonly used methods for testing the polarity of current transformers are the DC method and the instrument method.

[0003] For the DC method, connect the positive terminal of a dry cell or battery to the P1 terminal of the current transformer's primary winding, and the negative terminal to the P2 terminal. Connect the S1 terminal of the current transformer's secondary winding to the positive terminal of a pointer-type ammeter, and the S2 terminal to the negative terminal. After these connections are made, if the pointer of switch S deflects positively when closing and negatively when opening, the current transformer has subtractive polarity. If the pointer swings in the opposite direction, it has adding polarity.

[0004] The instrument method uses a current transformer polarity tester to verify the polarity of the current transformer. The P1 wire on the primary side of the tester is connected to the P1 polarity end of the current transformer primary winding, and the P2 wire is connected to the P2 polarity end of the current transformer primary winding; the S1 wire on the secondary side of the tester is connected to the S1 polarity end of the current transformer secondary winding, and the S2 wire is connected to the S2 polarity end of the current transformer secondary winding. After connecting the test wires, press the test switch to start the test, and the current transformer polarity is displayed on the device display. Defects and shortcomings of the existing technology: DC method: Using the DC method to verify the polarity of the current transformer requires the preparation of multiple instruments and the cooperation of multiple people. The display of the verification results is not very intuitive and inefficient. Instrument method: Using the instrument method to verify the polarity of the current transformer requires the transportation of heavy test instruments, and the test instruments require an external power supply, which is time-consuming and labor-intensive to use.

[0005] Therefore, there is an urgent need for a portable and rechargeable current transformer polarity verification device to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a portable rechargeable current transformer polarity verification device to solve the problems raised in the background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a portable rechargeable current transformer polarity calibration device, including a calibration device, wherein the calibration device includes an SB test button, a QF power switch, a DC storage battery pack, a current type relay and its contacts, a resistor, a polarity indicator light and a diode, which constitute a primary side test circuit, a secondary side test circuit and a charging circuit. The primary side test circuit is composed of a plurality of parallel current relays, contact resistors and a plurality of parallel polarity indicator lights connected at both ends of the current transformer to be tested. The secondary side test circuit is composed of two diodes connected in reverse parallel to each other at both ends of the current transformer to be tested. The two parallel circuits of the secondary side test circuit are both connected in series with the diodes with current relays and resistors. A connection panel is provided on the front of the calibration device, and the calibration device is respectively connected to the primary winding and the secondary winding of the current transformer through the connection panel.

[0008] During charging, after connecting to the external power supply, the DC storage battery pack is charged through the charging circuit; during testing, close the QF power switch and press the SB test button. The DC storage battery pack generates a primary current in the primary side test circuit. According to the current transformer principle, the secondary side can generate an induced current, which is discharged through the primary winding of the current transformer. The secondary winding generates an induced current. The induced current conducts diodes in different directions in the secondary side test circuit to form a loop, triggering the corresponding polarity indicator light to light up to determine the polarity.

[0009] Preferably, the current flowing through the current relay is greater than its action value, and the relay coil will be energized; the current relay includes a first current relay, a second current relay, a third current relay and a fourth current relay, the first current relay and the second current relay are arranged in parallel in the primary side test circuit, and the third current relay and the fourth current relay are arranged in parallel in the secondary side test circuit.

[0010] Preferably, the contact is composed of two two-pin connecting terminals; when the relay coil is energized, its corresponding contact is turned on, and the contact includes a first contact, a second contact, a third contact and a fourth contact, and the first contact, the second contact, the third contact and the fourth contact correspond to the first current relay, the second current relay, the third current relay and the fourth current relay respectively.

[0011] Preferably, the resistor includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; the polarity indicator light includes a negative polarity indicator light and a positive polarity indicator light; and the diode includes a first diode and a second diode.

[0012] Preferably, the primary side test circuit includes an SB test button, a QF power switch, a DC storage battery pack, a first test unit, a second test unit, a subtractive polarity display unit and a plus polarity display unit. The first test unit includes a first resistor, a third contact, a second resistor, a first contact and a first current relay. The first resistor and the third contact are connected in series, the second resistor and the first contact are connected in series, the first resistor and the third contact, the second resistor and the first contact are connected in parallel and then in series with the first current relay; the second test unit includes a third resistor, a fourth contact, the second contact of the fourth resistor and the second current relay. The third resistor and the fourth contact, the fourth resistor and the second contact are connected in parallel and then in series with the second current relay.

[0013] Preferably, the subtractive polarity display unit includes a fifth resistor, a first contact and a subtractive polarity indicator light connected in series, the plus polarity display unit includes a sixth resistor, a second contact and a plus polarity indicator light connected in series, and the first test unit, the second test unit, the subtractive polarity display unit and the plus polarity display unit are arranged in parallel and connected in series with the SB test button, the QF power switch and the DC storage battery pack.

[0014] Preferably, the secondary side test circuit includes a seventh resistor, a first diode, a third current relay, an eighth resistor, a second diode and a fourth current relay, the first diode and the second diode are connected in reverse parallel, the seventh resistor, the first diode and the third current relay are connected in series, and the eighth resistor, the second diode and the fourth current relay are connected in series.

[0015] Preferably, the positive terminal of the charging circuit is connected to the negative terminal of the DC storage battery pack, and the negative terminal of the charging circuit is connected to the positive terminal of the DC storage battery pack.

[0016] Preferably, a voltage display screen is provided on the upper left side of the connection panel, and an SB test button, a negative polarity indicator light and a positive polarity indicator light are provided below the voltage display screen from left to right. A QF power switch is provided on the right side of the voltage display screen, and primary winding jacks P and P are provided below the QF power switch, and secondary winding jacks S and S are provided below the jacks P and P.

[0017] Preferably, the positive end of the voltage display screen is connected to the positive electrode of the DC storage battery pack, and the negative end of the voltage display screen is connected to the negative electrode of the DC storage battery pack through a QF power switch.

[0018] The utility model has the following beneficial effects:

[0019] The utility model performs current transformer calibration without the need for an external power supply or the cooperation of multiple people, is convenient and quick, and the test results are intuitive, saving time and effort. At the same time, the device is rechargeable and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the circuit and test wiring of the utility model;

[0021] Figure 2 This is a schematic diagram of the polarity of the current transformer for DC method measurement;

[0022] Figure 3 This is a schematic diagram of the device panel of the present utility model;

[0023] Figure 4 This is a schematic diagram of the circuit and test wiring of Example 1 of the present utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] See also Figure 1 and Figure 3 A portable rechargeable current transformer polarity calibration device includes a calibration device 1, the calibration device 1 includes an SB test button 2.1, a QF power switch 2.2, a DC storage battery pack 5, a current type relay 6 and its contact 7, a resistor 8, a polarity indicator light 9 and a diode 10, which form a primary side test circuit 1.1, a secondary side test circuit 1.2 and a charging circuit 1.3. The primary side test circuit 1.1 is composed of multiple parallel current relays 6, contacts 7, resistors 8 and multiple parallel polarity indicator lights 9 connected at both ends of the current transformer to be tested. The secondary side test circuit 1.2 is composed of two diodes 10 connected in reverse parallel to each other at both ends of the current transformer to be tested. The two parallel circuits of the secondary side test circuit 1.2 are both connected in series with the diode 10 with a current relay 6 and a resistor 8. The front of the calibration device 1 is provided with a connection panel 2, and the calibration device 1 is respectively connected to the primary winding 3 and the secondary winding 4 of the current transformer through the connection panel 2;

[0026] During charging, after connecting to an external power source, the DC storage battery pack 5 is charged through the charging circuit 1.3. During testing, the QF power switch 2.2 is closed and the SB test button 2.1 is pressed. The DC storage battery pack 5 generates a primary current in the primary-side test circuit 1.1. According to the current transformer principle, an induced current can be generated on the secondary side, which is discharged through the primary winding 3 of the current transformer, and the secondary winding 4 generates an induced current. The induced current conducts diodes 10 in different directions in the secondary-side test circuit 1.2 to form a loop, triggering the corresponding polarity indicator light 9 to light up to determine the polarity.

[0027] Preferably, the current flowing through the current relay 6 is greater than its action value, and the relay coil will be energized; the current relay 6 includes a first current relay 6.1, a second current relay 6.2, a third current relay 6.3 and a fourth current relay 6.4, the first current relay 6.1 and the second current relay 6.2 are arranged in parallel in the primary side test circuit 1.1, and the third current relay 6.3 and the fourth current relay 6.4 are arranged in parallel in the secondary side test circuit 1.2.

[0028] Preferably, the contact 7 is composed of two two-pin connecting terminals; when the relay coil is energized, the corresponding contact 7 is turned on, and the contact 7 includes a first contact 7.1, a second contact 7.2, a third contact 7.3 and a fourth contact 7.4. The first contact 7.1, the second contact 7.2, the third contact 7.3 and the fourth contact 7.4 correspond to the first current relay 6.1, the second current relay 6.2, the third current relay 6.3 and the fourth current relay 6.4 respectively.

[0029] Preferably, the resistor 8 includes a first resistor 8.1, a second resistor 8.2, a third resistor 8.3, a fourth resistor 8.4, a fifth resistor 8.5, a sixth resistor 8.6, a seventh resistor 8.7 and an eighth resistor 8.8; the polarity indicator light 9 includes a minus polarity indicator light 9.1 and a plus polarity indicator light 9.2; and the diode 10 includes a first diode 10.1 and a second diode 10.2.

[0030] Preferably, the primary side test circuit 1.1 includes an SB test button 2.1, a QF power switch 2.2, a DC storage battery pack 5, a first test unit 1.1.1, a second test unit 1.1.2, a subtractive polarity display unit 1.1.3 and a plus polarity display unit 1.1.4. The first test unit 1.1.1 includes a first resistor 8.1, a third contact 7.3, a second resistor 8.2, a first contact 7.1 and a first current relay 6.1. The first resistor 8.1 and the third contact 7.3 are connected in series. The second resistor 8.2 is connected in series with the first contact 7.1, the first resistor 8.1 and the third contact 7.3, and the second resistor 8.2 and the first contact 7.1 are connected in parallel and then connected in series with the first current relay 6.1; the second test unit 1.1.2 includes the third resistor 8.3, the fourth contact 7.4, the fourth resistor 8.4, the second contact 7.2, and the second current relay 6.2, the third resistor 8.3 and the fourth contact 7.4, and the fourth resistor 8.4 and the second contact 7.2 are connected in parallel and then connected in series with the second current relay 6.2.

[0031] Preferably, the subtractive polarity display unit 1.1.3 includes a fifth resistor 8.5, a first contact 7.1 and a subtractive polarity indicator light 9.1 connected in series; the plus polarity display unit 1.1.4 includes a sixth resistor 8.6, a second contact 7.2 and a plus polarity indicator light 9.2 connected in series; the first test unit 1.1.1, the second test unit 1.1.2, the subtractive polarity display unit 1.1.3 and the plus polarity display unit 1.1.4 are arranged in parallel and then connected in series with the SB test button 2.1, the QF power switch 2.2 and the DC storage battery pack 5.

[0032] Preferably, the secondary side test circuit 1.2 includes a seventh resistor 8.7, a first diode 10.1, a third current relay 6.3, an eighth resistor 8.8, a second diode 10.2 and a fourth current relay 6.4, the first diode 10.1 and the second diode 10.2 are connected in reverse parallel, the seventh resistor 8.7, the first diode 10.1 and the third current relay 6.3 are connected in series, and the eighth resistor 8.8, the second diode 10.2 and the fourth current relay 6.4 are connected in series.

[0033] Preferably, the positive terminal of the charging circuit 1.3 is connected to the negative terminal of the DC storage battery pack 5, and the negative terminal of the charging circuit 1.3 is connected to the positive terminal of the DC storage battery pack 5.

[0034] Preferably, a voltage display screen 2.3 is provided on the upper left side of the connection panel 2, and an SB test button 2.1, a negative polarity indicator light 9.1, and a positive polarity indicator light 9.2 are provided below the voltage display screen 2.3 from left to right. A QF power switch 2.2 is provided on the right side of the voltage display screen 2.3, and primary winding 3 jacks P1 and P2 are provided below the QF power switch 2.2, and secondary winding 4 jacks S1 and S2 are provided below the jacks P1 and P2.

[0035] Preferably, the positive end of the voltage display screen 2.3 is connected to the positive electrode of the DC storage battery pack 5, and the negative end of the voltage display screen 2.3 is connected to the negative electrode of the DC storage battery pack 5 through the QF power switch 2.2.

[0036] Example 1

[0037] Reference Figure 4 As shown, L1 is the test result indicator light, indicating that the test result is subtractive polarity, the indicator light is green; L2 is the test result indicator light, indicating that the test result is plus polarity, the indicator light is red.

[0038] KM11, KM12, KM21, and KM22 are current-type relays. When the current flowing through them is greater than their action value, the relay coil will be energized. KM11', KM12', KM21', and KM22' are the contacts of relays KM11, KM12, KM21, and KM22 respectively. When the relay coil is energized, its corresponding contacts are turned on.

[0039] R11, R12, R13, R14, R15, R16, R21, and R22 are resistors with appropriate resistance values. They act as voltage dividers in the circuit to prevent the relay from being damaged due to excessive voltage.

[0040] RJ1 and RJ2 are diodes. When the current direction is the same as that of the diode, the diode resistance is very small, which is equivalent to a short circuit. When the current direction is opposite to that of the diode, the diode resistance is very large, which is equivalent to an open circuit.

[0041] The DC storage battery pack can be charged via the charging circuit. When the QF power switch is closed, the electronic voltmeter displays the DC storage battery pack voltage. Its display is located on the device panel. Close the device's power switch QF and correctly connect the device to the current transformer's polarity terminals P1, P2, S1, and S2. To verify the current transformer's polarity, press the test button SB. Current flows from P1 to P2 on the primary winding.

[0042] If the current transformer is of subtractive polarity, the current flows out from S1 on the secondary winding, and the current direction is consistent with the direction of diode RJ1 and opposite to the direction of RJ2. Relay KM21 is energized, and the contact of KM21' is turned on. Relay KM11 is energized, and the contact of KM11' is turned on. Relay KM11 is continuously energized, and the contact of KM11' is continuously turned on, and indicator light L1 is continuously on.

[0043] If the current transformer is of additive polarity, then on the secondary winding, the current flows out from S2, the current direction is consistent with the direction of diode RJ2 and opposite to the direction of RJ1, relay KM22 is energized, KM22' contact is turned on, relay KM12 is energized, KM12' contact is turned on, relay KM12 is continuously energized, KM12' contact is continuously turned on, and indicator light L2 is continuously on.

[0044] The working principle of this embodiment is as follows:

[0045] During use, first, the initial position of the QF power switch 2.2 is OFF, and the device is in a power-off state; switch the QF power switch 2.2 to the ON position, and the voltage display screen 2.3 shows the voltage of the built-in DC storage battery pack 5 of the device; use a test line to connect the P1 and P2 jacks of the device's primary jack 3 to the P1 and P2 polarity ends of the primary winding 3 respectively; use a test line to connect the S1 and S2 jacks of the device's secondary jack 4 to the S1 and S2 polarity ends of the secondary winding 4 respectively; press the test button, if the subtractive polarity indicator light 9.1 lights up, the current transformer polarity is subtractive polarity, and if the plus polarity indicator light 9.2 lights up, the current transformer polarity is plus polarity; after the calibration work is completed, switch the QF power switch 2.2 to the OFF position, the device is powered off, and reset the SB test button 2.1.

[0046] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A portable and rechargeable current transformer polarity verification device, characterized in that: The present invention comprises a calibration device (1), wherein the calibration device (1) comprises an SB test button (2.1), a QF power switch (2.2), a DC storage battery pack (5), a current type relay (6) and its contact (7), a resistor (8), a polarity indicator light (9) and a diode (10), which form a primary side test circuit (1.1), a secondary side test circuit (1.2) and a charging circuit (1.3), wherein the primary side test circuit (1.1) is a plurality of parallel current relays (6), contacts (7), resistors (8) and a plurality of parallel polarity The indicator light (9) is connected to both ends of the current transformer to be tested, the secondary side test circuit (1.2) is composed of two diodes (10) connected in reverse parallel to each other and connected to both ends of the current transformer to be tested, and the two parallel circuits of the secondary side test circuit (1.2) are both connected in series with the diodes (10) with a current relay (6) and a resistor (8), and the front of the verification device (1) is provided with a connection panel (2), and the verification device (1) is respectively connected to the primary winding (3) and the secondary winding (4) of the current transformer through the connection panel (2); During charging, after connecting to an external power source, the DC storage battery pack (5) is charged through the charging circuit (1.3); during testing, the QF power switch (2.2) is closed, and the SB test button (2.1) is pressed. The DC storage battery pack (5) generates a primary current in the primary side test circuit (1.1). According to the current transformer principle, an induced current can be generated on the secondary side, which is discharged through the primary winding (3) of the current transformer and generates an induced current on the secondary winding (4). The induced current conducts the diodes (10) in different directions in the secondary side test circuit (1.2) to form a loop, triggering the corresponding polarity indicator light (9) to light up and judge the polarity.

2. A portable and rechargeable current transformer polarity verification device according to claim 1, characterized in that: When the current flowing through the current relay (6) is greater than its action value, the relay coil will be excited; the current relay (6) includes a first current relay (6.1), a second current relay (6.2), a third current relay (6.3) and a fourth current relay (6.4), the first current relay (6.1) and the second current relay (6.2) are arranged in parallel in the primary side test circuit (1.1), and the third current relay (6.3) and the fourth current relay (6.4) are arranged in parallel in the secondary side test circuit (1.2).

3. A portable and rechargeable current transformer polarity verification device according to claim 1, characterized in that: The contact (7) is composed of two two-pin connection terminals; when the relay coil is energized, the corresponding contact (7) is turned on, and the contact (7) includes a first contact (7.1), a second contact (7.2), a third contact (7.3) and a fourth contact (7.4), and the first contact (7.1), the second contact (7.2), the third contact (7.3) and the fourth contact (7.4) respectively correspond to the first current relay (6.1), the second current relay (6.2), the third current relay (6.3) and the fourth current relay (6.4).

4. A portable and rechargeable current transformer polarity verification device according to claim 1, characterized in that: The resistor (8) includes a first resistor (8.1), a second resistor (8.2), a third resistor (8.3), a fourth resistor (8.4), a fifth resistor (8.5), a sixth resistor (8.6), a seventh resistor (8.7), and an eighth resistor (8.8); the polarity indicator light (9) includes a negative polarity indicator light (9.1) and a positive polarity indicator light (9.2); and the diode (10) includes a first diode (10.1) and a second diode (10.2).

5. The portable and rechargeable current transformer polarity verification device according to claim 1, characterized in that: The primary side test circuit (1.1) includes an SB test button (2.1), a QF power switch (2.2), a DC storage battery pack (5), a first test unit (1.1.1), a second test unit ( 1.1.2), subtractive polarity display unit (1.1.3) and plus polarity display unit (1.1.4), the first test unit ( 1.1.1) includes a first resistor (8.1), a third contact (7.3), a second resistor (8.2), the first contact (7.1) and a first current relay (6.1), the first resistor (8.1) and the third contact (7.3) are connected in series, the second resistor (8.2) and the first contact (7.1) are connected in series, the first resistor (8.1) and the third contact (7.3), the second resistor (8.2) and the first contact (7.1) are connected in parallel and then connected in series with the first current relay (6.1); the second test unit ( 1.1.2) includes a third resistor (8.3), a fourth contact (7.4), the fourth resistor (8.4), the second contact (7.2) and the second current relay (6.2), wherein the third resistor (8.3) and the fourth contact (7.4), the fourth resistor (8.4) and the second contact (7.2) are connected in parallel and then in series with the second current relay (6.2).

6. A portable and rechargeable current transformer polarity verification device according to claim 5, characterized in that: The subtractive polarity display unit (1.1.3) includes a fifth resistor (8.5), a first contact (7.1) and a subtractive polarity indicator light (9.1) connected in series, the plus polarity display unit (1.1.4) includes a sixth resistor (8.6), a second contact (7.2) and a plus polarity indicator light (9.2) connected in series, and the first test unit ( 1.1.1), the second test unit ( 1.1.2), the subtractive polarity display unit (1.1.3) and the plus polarity display unit (1.1.4) are connected in parallel and then connected in series with the SB test button (2.1), the QF power switch (2.2) and the DC storage battery pack (5).

7. The portable and rechargeable current transformer polarity verification device according to claim 1, characterized in that: The secondary side test circuit (1.2) includes a seventh resistor (8.7), a first diode (10.1), a third current relay (6.3), an eighth resistor (8.8), a second diode (10.2) and a fourth current relay (6.4), wherein the first diode (10.1) and the second diode (10.2) are connected in reverse parallel, the seventh resistor (8.7), the first diode (10.1) and the third current relay (6.3) are connected in series, and the eighth resistor (8.8), the second diode (10.2) and the fourth current relay (6.4) are connected in series.

8. The portable rechargeable current transformer polarity verification device according to claim 1, characterized in that: The positive terminal of the charging circuit (1.3) is connected to the negative terminal of the DC storage battery pack (5), and the negative terminal of the charging circuit (1.3) is connected to the positive terminal of the DC storage battery pack (5).

9. The portable and rechargeable current transformer polarity verification device according to claim 1, characterized in that: A voltage display screen (2.3) is provided on the upper left side of the connection panel (2), and an SB test button (2.1), a negative polarity indicator light (9.1), and a positive polarity indicator light (9.2) are provided below the voltage display screen (2.3) from left to right. A QF power switch (2.2) is provided on the right side of the voltage display screen (2.3), and primary winding (3) jacks P1 and P2 are provided below the QF power switch (2.2), and secondary winding (4) jacks S1 and S2 are provided below the jacks P1 and P2.

10. The portable and rechargeable current transformer polarity verification device according to claim 9, characterized in that: The positive end of the voltage display screen (2.3) is connected to the positive pole of the DC storage battery pack (5), and the negative end of the voltage display screen (2.3) is connected to the negative pole of the DC storage battery pack (5) through the QF power switch (2.2).

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