CN114325185A - Transformer low pressure wiring detection circuitry, PCB board and detection device - Google Patents
Transformer low pressure wiring detection circuitry, PCB board and detection device Download PDFInfo
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Abstract
The invention discloses a transformer low-voltage wiring detection circuit, a PCB (printed circuit board) and a detection device, wherein the detection circuit comprises an input part, a trigger button S1, a detection recognition part and a first indicator light L1, the input part is used for providing safe alternating-current low-voltage less than or equal to 36V, one end of the input part is connected with one end of the trigger button S1, one end of the first indicator light L1 is connected with the other end of the trigger button S1 through the detection recognition part, and the detection recognition part is used for adjusting the working state of the first indicator light L1; the other end of the first indicator light L1 is connected with the other end of the input part, and the connection end point of the first indicator light L1 is used for connecting a cable to be detected; the application discloses detection circuitry, input portion can provide safe alternating current low voltage, activates the alternating current reactance characteristic value of transformer low voltage winding, and detection identification portion is according to whether having alternating current reactance characteristic value in the detection return circuit, adjusts the operating condition of first pilot lamp L1 to whether the realization cable wiring is correct detection.
Description
Technical Field
The invention relates to the technical field of transformer detection equipment, in particular to a transformer low-voltage wiring detection circuit, a PCB and a detection device.
Background
The transformer passes through cable connection to the low pressure master cabinet, take 800kVA transformer as an example, accomplish the cable connection at low pressure abc three-phase and N line both ends, relate to single core cable number 14, 28 terminal wiring need operate, because the number of times of working a telephone switchboard is many, have wrong connection cable conductor risk, if arbitrary two-phase single core and above cable wiring mistake, transformer low pressure double-phase or single-phase short circuit accident can appear, the consequence is transformer high-low voltage switch tripping operation, the serious consequence is transformer burnout, or transformer substation's outlet switch tripping operation, cause the large tracts of land power failure accident.
In the prior art, in order to distinguish the cables, colors such as red, green and yellow are wrapped at two ends of a single-core cable to be identified and distinguished, and the color codes are cut out carelessly when redundant cables are cut out manually or the copper bar position of a wiring cable of a low-voltage main cabinet is shielded by the color codes and other reasons, so that the risk of wrong wiring of the low-voltage cable of the transformer still exists, and whether the wiring is correct or not is detected after the wiring is finished.
In the process of connecting a plurality of single-core cables in parallel, if any single-core cable is connected in error, the result shows that the transformer is in low-voltage short circuit, and the sum of direct-current resistances of a transformer low-voltage winding and a connecting cable which can be used as a basis for identification and judgment is only m omega value; when the cable is correctly connected, the low-voltage winding of the transformer is communicated with every two phases of the cable or the single phase of the low-voltage winding of the transformer is communicated with N and N' through the cable, and the direct-current resistance is only in the level of m omega value, namely, the direct-current resistance which can be used as a judgment basis is in the level of small m omega value or mu omega value no matter the cable is correctly connected or wrongly connected, so that the existing multimeter and the conventional megger cannot be used for quickly, visually and reliably detecting whether the installed cable is correctly connected.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a transformer low-voltage connection detection circuit, which uses an input unit to provide a safe ac low-voltage, activates a reactance value of a transformer low-voltage winding in a level of tens of Ω, i.e. determines whether to perform identification according to the increase from the level of m Ω to the level of tens of Ω, and can realize reliable detection and identification of whether cable connection is correct.
In order to achieve the purpose, the invention adopts the following technical scheme:
a transformer low-voltage wiring detection circuit comprises an input part, a trigger button S1, a detection identification part and a first indicator light L1, wherein the input part is used for providing safe alternating-current low-voltage, and the alternating-current voltage is less than or equal to 36V; one end of the input part is connected with one end of the trigger button S1, one end of the first indicator light L1 is connected with the other end of the trigger button S1 through the detection identification part, the detection identification part is used for adjusting the working state of the first indicator light L1, the other end of the first indicator light L1 is connected with the other end of the input part, and the connection end point of the first indicator light L1 is used for connecting a cable to be detected.
In the transformer low-voltage wiring detection circuit, the input part comprises a transformation device and a fuse F1, one end of the fuse F1 is connected with the output end of the transformation device, and the other end of the fuse F1 is connected with one end of the trigger button S1; the voltage transformation device is used for converting 220V alternating current voltage into safe 24V alternating current low-voltage.
In the transformer low-voltage wiring detection circuit, the detection identification part comprises a voltage division element and a relay KA, one end of the first indicator light L1 is connected with the other end of the trigger button S1 through a normally open contact of the relay KA, one end of the voltage division element is connected with one end of the relay KA and the other end of the trigger button S1, the other end of the voltage division element is connected with the other end of the relay KA, and a connection end point of the voltage division element is used for connecting a cable to be detected.
In the transformer low-voltage wiring detection circuit, the voltage dividing element comprises a first resistor R1, one end of the first resistor R1 is connected with one end of the relay KA and the other end of the trigger button S1, the other end of the first resistor R1 is connected with the other end of the relay KA, and a connecting end point of the first resistor R1 is used for connecting a cable to be detected.
The transformer low-voltage wiring detection circuit further comprises a second indicator light L2, one end of the second indicator light L2 is connected with the other end of the trigger button S1 through a normally closed contact of the relay KA, the other end of the second indicator light L2 is connected with the other end of the input portion, and a connection end point of the second indicator light L2 is used for being connected with a cable to be detected.
The transformer low-voltage wiring detection circuit further comprises a buzzer BUZ1, one end of the buzzer BUZ1 is connected with the other end of the trigger button S1 through a normally open contact of the relay KA, the other end of the buzzer BUZ1 is connected with the other end of the input part, and a connection end point of the buzzer BUZ1 is used for connecting a cable to be detected.
In the transformer low-voltage wiring detection circuit, the relay KA is a 24V intermediate relay; the first resistor R1 is 20 Ω.
The invention further correspondingly provides a PCB board, and the transformer low-voltage wiring detection circuit is printed on the PCB board.
The invention also correspondingly provides a transformer low-voltage wiring detection device which comprises a shell, wherein a 220V step-down transformer and the PCB are arranged in the shell, a trigger button, a first indicator lamp, a second indicator lamp, a power interface, a first connecting port and a second connecting port are arranged on the shell, the trigger button, the power interface, the first connecting port, the second connecting port, the first indicator lamp and the second indicator lamp are respectively and electrically connected with the PCB, the power interface is used for connecting a 220V power line, and the first connecting port and the second connecting port are used for connecting a cable to be detected.
In the transformer low-voltage wiring detection device, a buzzer is further arranged in the shell and electrically connected with the PCB.
Has the advantages that:
the invention provides a transformer low-voltage wiring detection circuit, when a trigger button S1 is triggered, an input part provides safe alternating-current low-voltage, an alternating-current reactance value of a transformer low-voltage winding can be activated, if a plurality of transformer low-voltage in-phase single-core cables are correctly wired, the reactance value of the transformer low-voltage winding exists in a detection loop, and a detection identification part controls a first indicator light L1 to be out of work; if wrong wiring exists in a plurality of single-core cables with the same low voltage and the same phase of the transformer, the low voltage winding of the transformer is in short circuit by the wrong wiring cables, no reactance value exists in a detection loop, the detection and identification part controls the first indicator lamp L1 to work, the detection of the correctness of the wiring of the low voltage cable of the transformer is realized, and the safety of the wiring of the low voltage cable of the transformer is ensured.
Drawings
FIG. 1 is a schematic diagram of a circuit structure of a detection circuit according to the present invention;
FIG. 2 is a first operational schematic diagram of a detection circuit provided by the present invention;
FIG. 3 is a second operational schematic diagram of the detection circuit provided by the present invention;
FIG. 4 is a third operational schematic diagram of the detection circuit provided by the present invention;
FIG. 5 is a schematic structural diagram of a detecting device provided in the present invention;
fig. 6 is a schematic diagram of correct connection between a low-voltage end of a conventional transformer and a cable at a distribution main cabinet end;
FIG. 7 is a DC equivalent circuit of the transformer with correct low-voltage cable connection;
fig. 8 is an ac equivalent circuit when the low-voltage cable of the transformer is correctly wired.
Description of the main element symbols: 1-shell, 21-self-test button, 22-switch button, 23-trigger button, 3-first indicator light, 4-second indicator light, 51-first interface, 52-second interface and 6-power interface.
Detailed Description
The invention provides a transformer low-voltage wiring detection circuit, a PCB and a detection device, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments.
In the description of the present invention, it should be understood that the terms "mounted," "wired," etc. should be interpreted broadly, and specific meanings of the terms in the present invention may be understood by those skilled in the art according to specific situations.
Referring to fig. 6, fig. 6 is a schematic diagram of correct connection between a low-voltage end of a conventional transformer and a cable at a distribution main cabinet, where N phases are connected to 2 single-core cables, a phase, b phase and c phase are respectively connected to 4 single-core cables, one end of the connection is at a low-voltage side of the transformer, the cables pass through a cable trench or a cable trough, and the other end of the connection is at the low-voltage main cabinet; taking an 800kVA transformer as an example, completing the wiring of two ends of a phase a, a phase b, a phase c and a phase N, the number of times of connecting terminal operation is required: 2 x (4 × 3+2) ═ 28 (times), because the number of times of connection is many, there is one or more single core cables wrong risk of connection in any two phases, if the transformer low voltage cable line is wrong, it will cause transformer low voltage two-phase or single phase short circuit accident, the consequence is transformer high low voltage switch tripping, the serious consequence is transformer burnout, or the transformer substation outlet switch tripping, cause the large area power failure accident.
Referring to fig. 7, fig. 7 is a dc equivalent circuit when the low-voltage cable of the transformer is correctly wired, wherein Ra, Rb and Rc are low-voltage winding resistors of the transformer, and R1a, R1b, R1c and RlN are cable resistors; the dc resistance of each port is as follows:
Ra’N’＝Rla+Ra+RlN；
Rb’N’＝Rlb+Rb+RlN；
Rc’N’＝Rlc+Rc+RlN；
Ra'b'＝Rla+Ra+Rb+Rlb；
Ra'c'＝Rla+Ra+Rc+Rlc；
Rb'c'＝Rlb+Rb+Rc+Rlc；
according to the formula of the resistance of the copper core cable conductor, wherein rho l/s is 0.0172/240 × l is 71.6666 μ Ω/m, the length of each cable is no more than 20 meters according to the position change of the installation engineering transformer and the total cabinet, after a plurality of cables are connected in parallel, the resistance values of the Rla, the Rlb, the Rlc and the RlN are changed from tens of μ Ω to hundreds of μ Ω.
TABLE 1 Transformer Low Voltage winding DC resistance sample value (m omega)
As can be seen from table 1, since the dc resistance values Ra, Rb, and Rc < 3m Ω of the low-voltage winding of the transformer vary, the dc resistances Ra 'N', Rb 'N', Rc 'N', Ra 'b', Ra 'c', and Rb 'c' < 6m Ω of the 6 ports, that is, the dc resistances of the respective ports vary in a very small m Ω range when the wiring is correctly performed.
When the wiring is wrongly connected, the result shows that the transformer is in a low-voltage short circuit, the identification and judgment are based on the direct-current resistance of the low-voltage winding of the transformer, the direct-current resistance is in the order of m omega value, and the contact resistance and the resistance of the cable conductor are in the order of mu omega value; the direct current resistance of each port of the transformer is in a small m omega value level to hundreds of mu omega value levels no matter whether the low-voltage winding of the transformer is connected correctly or not, and the variation difference is not large enough and the variation is not obvious.
Therefore, the detection and identification judgment of whether the low-voltage cable of the transformer is connected correctly is carried out by adopting a conventional universal meter and a megger, and in the detection and identification judgment detection loop, the change of the resistance of the low-voltage winding of the level of the direct current resistance of the whole detection loop is identified under the state that the direct current resistance of the whole detection loop is less than 6m omega; namely, the existing measuring universal instrument is insufficient for detecting and identifying whether the wiring of the low-voltage cable of the transformer is correct.
Referring to fig. 8, fig. 8 is an ac equivalent circuit when the low-voltage cable of the transformer is correctly wired, where Ra, Rb and Rc are resistances of the low-voltage winding of the transformer, R1a, R1b, R1c and RlN are resistances of the wired cable, and Xa, Xb and Xc are ac reactances of the low-voltage winding of the transformer; the low-voltage winding of the transformer generates reactances Xa, Xb and Xc under the action of alternating voltage, and the impedance value of each port is as follows:
Ra’N’＝Rla+Ra+Xa+RlN；
Rb’N’＝Rlb+Rb+Xb+RlN；
Rc’N’＝Rlc+Rc+Xc+RlN；
Ra'b'＝Rla+Ra+Xa+Xb+Rb+Rlb；
Ra'c'＝Rla+Ra+Xa+Xc+Rc+Rlc；
Rb'c'＝Rlb+Rb+Xb+Xc+Rc+Rlc；
TABLE 2 Transformer Low Voltage winding applied AC 24V reactance sample value (omega)
As can be seen from Table 2, the reactance values of the transformer low-voltage winding under the action of alternating current voltage and the phase resistances Xa, Xb and Xc vary between 38.4 and 72.3 omega, i.e. the reactance characteristic values thereof are tens of omega.
Due to Ra 'N', Rb 'N', Rc 'N', Ra 'b', Ra 'c' and Rb 'c' < 6m omega, in combination with the sampled reactance value of the low-voltage winding of the transformer under the action of the alternating voltage, the reactance value in the detection loop is presented by tens of omega, and the sum of the winding resistance and the cable resistance is presented by a value < 6m omega; therefore, in the whole detection loop, the reactance value of the low-voltage winding accounts for more than 99% of the impedance value of the detection loop, that is, the reactance value of the detection loop is far larger than the resistance value of the detection loop, and the impedance of each port is approximated as follows:
Ra’N’＝Rla+Ra+Xa+RlN≈Xa；
Rb’N’＝Rlb+Rb+Xb+RlN≈Xb；
Rc’N’＝Rlc+Rc+Xc+RlN≈Xc；
Ra'b'＝Rla+Ra+Xa+Xb+Rb+Rlb≈Xa+Xb；
Ra'c'＝Rla+Ra+Xa+Xc+Rc+Rlc≈Xa+Xc；
Rb'c'＝Rlb+Rb+Xb+Xc+Rc+Rlc≈Xb+Xc；
the analysis of the resistance value and the reactance value of the low-voltage winding of the transformer shows that the alternating-current voltage is selected as the detection voltage because when the alternating-current voltage is applied to the low-voltage winding of the transformer, the reactance value of the detection loop is shown and is far greater than the resistance value of the low-voltage winding of the transformer and the resistance value of a cable wire, the comparison of the circuit parameter resistance values is conveniently realized, the judgment condition is obvious, and the accuracy and the reliability of the detection result are ensured.
Referring to fig. 6, when a safe ac low-voltage is applied to 6 ports a 'b', a 'c', b 'c', a 'N', b 'N', and c 'N', if the transformer low-voltage cable is correctly wired, the reactances Xa, Xb, and Xc of the transformer low-voltage winding are presented by values over several tens of Ω, if the transformer low-voltage cable is incorrectly wired, the resistance and reactance of the transformer low-voltage winding are shorted, only the resistance of the connection cable in the detection loop is in the level of μ Ω, that is, by determining whether the reactance value in the detection loop exists, the correct or incorrect connection of the transformer low-voltage cable can be determined.
Therefore, the reactance of the low-voltage winding of the transformer is activated by applying safe alternating-current low-voltage, the loop impedance value of the detection circuit is the loop impedance value which is characterized by the reactance value of dozens of omega of the winding, whether the reactance value exists in the detection loop can be easily known, namely whether the low-voltage cable of the transformer is correctly wired or not can be easily judged, and the detection result is ensured to be accurate and reliable.
Referring to fig. 1 to 4, the present invention provides a transformer low-voltage wiring detection circuit, which includes an input portion, a trigger button S1, a detection identification portion and a first indicator light L1, wherein the input portion is used for providing a safe ac low-voltage, and the ac low-voltage is less than or equal to 36V; one end of the input part is connected with one end of the trigger button S1, one end of the first indicator light L1 is connected with the other end of the trigger button S1 through the detection identification part, and the detection identification part is used for adjusting the working state of the first indicator light L1; the other end of the first indicator light L1 is connected with the other end of the input part, and the connection end point of the first indicator light L1 is used for connecting a cable to be detected, namely the connection end point of the other end of the first indicator light L1 and the other end of the input part is used for connecting the cable to be detected; in one embodiment, the first indicator light L1 is a red light, and the input portion may provide an ac voltage of 5V, 12V, 24V, or 36V.
When the trigger button S1 is triggered, the input part provides safe alternating-current low-voltage, and the reactance value of the low-voltage winding of the transformer can be activated; if the low-voltage in-phase single-core cables of the transformer are correctly wired, the reactance value of a low-voltage winding of the transformer exists in a detection loop, the wiring loop is judged to be correct, and the detection and identification part controls the first indicator lamp L1 not to work, so that the wiring is correct; if the low-voltage in-phase single-core cables of the transformer are connected in a wrong way, the low-voltage winding of the transformer is short-circuited by the cables connected in the wrong way, a reactance value does not exist in a detection loop, the connection loop is judged to be wrong, the detection and identification part controls the first indicator lamp L1 to work, the connection is indicated to be wrong, the detection and identification of whether the low-voltage cables of the transformer are connected in a correct way are realized, and the safety of the connection of the low-voltage cables of the transformer is improved.
Further, referring to fig. 1, the input portion includes a voltage transformation device and a fuse F1, one end of the fuse F1 is connected to an output terminal of the voltage transformation device, and the other end of the fuse F1 is connected to one end of the trigger button S1; the voltage transformation device is used for converting 220V alternating voltage into 24V alternating voltage; the fuse F1 is arranged, so that the safety degree of the detection circuit during working can be improved; the transformation device is an existing 220V transformation device, and in other embodiments, the transformation device can convert 220V alternating voltage into safe low-voltage alternating voltage which is less than or equal to 36V.
Further, referring to fig. 1, the detection identification portion includes a voltage dividing element and a relay KA, one end of the first indicator light L1 is connected to the other end of the trigger button S1 through a normally open contact of the relay KA, one end of the voltage dividing element is connected to one end of the relay KA and the other end of the trigger button S1, the other end of the voltage dividing element is connected to the other end of the relay KA, and a connection end point of the voltage dividing element is used for connecting a cable to be detected, that is, the connection end point of the other end of the voltage dividing element and the other end of the relay KA is used for connecting the cable to be detected; in one embodiment, the relay KA is an alternating current type 24V intermediate relay, the actuation voltage of the relay KA is 19.2V, that is, when the voltage across the relay KA is less than 19.2V, the normally closed contact of the relay KA is closed, and when the voltage across the relay KA is greater than or equal to 19.2V, the normally open contact of the relay KA is closed.
Further, referring to fig. 1, the voltage dividing element includes a first resistor R1, one end of the first resistor R1 is connected to one end of the relay KA and the other end of the trigger button S1, the other end of the first resistor R1 is connected to the other end of the relay KA, and a connection end point thereof is used for connecting a cable to be detected, that is, the connection end point of the other end of the first resistor R1 and the other end of the relay KA is used for connecting the cable to be detected; in one embodiment, the first resistor R1 is 20 Ω.
Further, referring to fig. 1, the transformer low-voltage wiring detection circuit further includes a second indicator light L2, one end of the second indicator light L2 is connected to the other end of the trigger button S1 through a normally closed contact of the relay KA, the other end of the second indicator light L2 is connected to the other end of the input portion, and a connection end point of the second indicator light L2 is used for connecting a cable to be detected, that is, a connection end point of the other end of the second indicator light L2 and the other end of the input portion is used for connecting the cable to be detected; when the wiring of the transformer low-voltage cable is correct, the reactance of the transformer low-voltage winding exists in the detection loop, the voltage at two ends of the relay KA is lower than the working voltage of the relay KA, the normally closed contact of the relay KA is closed, and the second indicator light L2 works to indicate that the wiring of the transformer cable is correct; in one embodiment, the second indicator light L2 is a green light.
Further, referring to fig. 1, the transformer low-voltage wiring detection circuit further includes a buzzer BUZ1, one end of the buzzer BUZ1 is connected with the other end of the trigger button S1 through a normally open contact of the relay KA, the other end of the buzzer BUZ1 is connected with the other end of the input part, and a connection end point of the buzzer BUZ1 is used for connecting a cable to be detected, that is, the connection end point of the other end of the buzzer BUZ1 and the other end of the input part is used for connecting the cable to be detected; a buzzer BUZ1 is provided, when there is wiring error, namely when there is no reactance of the low-voltage winding of the transformer in the detection loop, the first indicator lamp L1 is lighted, the buzzer BUZ1 starts to work at the same time, and sounds to indicate that there is wiring error, thus playing a role of strengthening indication.
For example, referring to fig. 2, fig. 2 is a diagram illustrating that the detection circuit detects the connection condition of the a-phase and the b-phase, wherein the a-phase and the b-phase are correctly connected, and at this time, the 24V ac voltage output by the transformer device forms an ac loop through the trigger button S1, the first resistor R1, the a-phase cable resistor R1a, the a-phase winding resistor Ra, the a-phase resistor Xa, the b-phase resistor Xb, the b-phase winding resistor Rb, and the b-phase cable resistor R1 b; since 24V alternating voltage activates the reactances Xa and Xb of the low-voltage winding, the sum of the reactance values of Xa and Xb is 100 omega, the resistance 20 omega of the voltage-dividing resistance R1 is far smaller than the reactance values of a phase and b phase, in the detection loop, the divided voltage of the first resistance R1 is 4.7V, since the first resistance R1 is connected in parallel with the relay KA, the voltage across the relay KA is far less than 19.2V, the relay KA cannot act, the normally closed contact of the relay KA is closed, and the second indicator light L2 is lightened, so that the cable connection of the low-voltage winding of the transformer is correct.
Referring to fig. 3, fig. 3 is a diagram illustrating a detection circuit for detecting a connection condition of an a-phase and a b-phase, where the a-phase and the b-phase are in a wrong connection condition, at this time, reactances Xa and Xb of a low-voltage winding are zero, winding resistances Ra and Rb are connected in parallel to cable resistances R1a and R1b and are in a μ Ω level, therefore, a loop resistance of the detection circuit is approximately equal to a resistance of the first resistance R1, a 24V ac voltage output by the transformer device is substantially applied to two ends of the first resistance R1, i.e., to two ends of the relay KA, the voltage is approximately 24V, a normally open contact of the relay KA is closed, the first indicator light L1 is turned on, and the buzzer BUZ1 operates, which indicates that the cable connection condition of the low-voltage winding of the transformer is in a wrong connection condition.
Referring to fig. 4, fig. 4 is a diagram illustrating a detection circuit detecting a connection condition of an a-phase and an N-phase, where the a-phase and the N-phase are in a wrong connection, at this time, a reactance Xa of a low-voltage winding is zero, and a winding resistance Ra is connected in parallel to R1a and R1N and is in a μ Ω value, so that a loop resistance of the detection circuit is approximately equal to a resistance of the first resistance R1, a 24V ac voltage output by the transformer is completely applied to two ends of the first resistance R1, that is, all the 24V ac voltage is applied to two ends of the relay KA, a normally open contact of the relay KA is pulled in, the first indicator lamp L1 is turned on, and the buzzer BUZ1 operates to indicate a wrong connection of a cable of the low-voltage winding of the transformer.
To sum up, the transformer low pressure wiring detection circuitry that this application disclosed, input portion can provide safe alternating current low voltage to the reactance of activation transformer low voltage winding, whether detection identification portion exists the reactance value according to detecting in the return circuit, adjusts the operating condition of first pilot lamp L1, can realize that whether cable connection is accurate quick detection, and the testing result is accurate reliable, has improved the degree of safety of transformer low pressure wiring.
The invention further correspondingly provides a PCB board, and the transformer low-voltage wiring detection circuit is printed on the PCB board.
Referring to fig. 5, the invention further provides a transformer low-voltage wiring detection device, which includes a housing 1, the PCB board is disposed in the housing 1, the housing 1 is provided with a trigger button 23, a first indicator lamp 3, a second indicator lamp 4, a power interface 6, a first connection port 51 and a second connection port 52, the trigger button 23, the power interface 6, the first connection port 51, the second connection port 52, the first indicator lamp 3 and the second indicator lamp 4 are electrically connected to the PCB board, the power interface 6 is used for connecting a power line, that is, the detection device is connected to a mains supply through the power interface 6 and the power line; the first connecting port 51 and the second connecting port 52 are used for connecting cables to be detected, specifically, during actual work, workers connect the installed low-voltage multi-cable through the first connecting port 51, the second connecting port 52, the test wire and the clamp and connect the cabinet junction end, and the connection correctness of the low-voltage cables in the installation engineering of the distribution transformer is comprehensively detected and identified by quickly detecting the ports a 'b', a 'c', b 'c', a 'N', b 'N' and c 'N' for 6 times; in one embodiment, the trigger button 23 is an automatic reset button, the trigger button 23 is operated by detecting the feeling of the worker, and when the external force disappears, the trigger button 23 triggers the power supply to be automatically turned off, so that the safety of the detection process is improved.
In the low-voltage wiring detection device for the transformer, during actual work, the power supply interface 6 is connected with commercial power through a power line, and the first connecting port 51 and the second connecting port 52 are connected with a cable to be detected through a test line and a clamp; when the trigger button 23 is pressed, the detection device starts to execute detection work, and if a wiring error of the transformer low-voltage cable exists, the first indicator lamp 3 is lightened, so that a worker can intuitively know that the wiring error of the transformer low-voltage cable exists.
Further, referring to fig. 5, a buzzer is further disposed in the housing 1, and the buzzer is electrically connected to the PCB; if the low-voltage cable of the transformer is correctly wired, the second indicator lamp 4 is lightened, so that a worker can intuitively know that the wiring is correct; if transformer low tension cable wiring error, first pilot lamp 3 and bee calling organ work simultaneously, strengthen the warning effect, make the staff learn to have the wiring error according to ruddiness and bee sound.
Further, referring to fig. 5, the transformer low-voltage wiring detection device further includes a switch button 22 and a self-test button 21 disposed on the housing 1, and the switch button 22 and the self-test button 21 are electrically connected to the PCB respectively; the switch button 22 is used for realizing the power on and off of the transformer low-voltage wiring detection device; the self-checking button 21 is used for detecting whether the low-voltage wiring detection device of the transformer works normally or not; when the trigger button 23 is pressed and the self-checking button 21 is pressed simultaneously, the first indicator lamp 3 and the buzzer work simultaneously, which indicates that the transformer low-voltage wiring detection device works normally; a self-checking button 21 is arranged to check whether the detection device works normally before a detection task is carried out, so that the reliability of the detection device is improved; in one embodiment, the switch button 22 and the self-test button 21 are both reset buttons.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (10)
1. The transformer low-voltage wiring detection circuit is characterized by comprising an input part, a trigger button S1, a detection identification part and a first indicator light L1, wherein the input part is used for providing safe alternating-current low-voltage which is less than or equal to 36V; one end of the input part is connected with one end of the trigger button S1, one end of the first indicator light L1 is connected with the other end of the trigger button S1 through the detection identification part, and the detection identification part is used for adjusting the working state of the first indicator light L1; the other end of the first indicator light L1 is connected with the other end of the input part, and the connection end point of the first indicator light L1 is used for connecting a cable to be detected.
2. The transformer low-voltage wiring detection circuit according to claim 1, wherein the input portion comprises a transformer and a fuse F1, one end of the fuse F1 is connected with an output end of the transformer, and the other end of the fuse F1 is connected with one end of the trigger button S1; the voltage transformation device is used for converting 220V alternating voltage into 24V alternating voltage.
3. The transformer low-voltage wiring detection circuit according to claim 1, wherein the detection identification portion comprises a voltage division element and a relay KA, one end of the first indicator light L1 is connected with the other end of the trigger button S1 through a normally open contact of the relay KA, one end of the voltage division element is connected with one end of the relay KA and the other end of the trigger button S1, the other end of the voltage division element is connected with the other end of the relay KA, and a connection end point of the voltage division element is used for connecting a cable to be detected.
4. The transformer low-voltage wiring detection circuit according to claim 3, wherein the voltage dividing element comprises a first resistor R1, one end of the first resistor R1 is connected with one end of the relay KA and the other end of the trigger button S1, the other end of the first resistor R1 is connected with the other end of the relay KA, and the connection terminal of the first resistor R1 is used for connecting a cable to be detected.
5. The transformer low-voltage wiring detection circuit according to claim 3, further comprising a second indicator light L2, wherein one end of the second indicator light L2 is connected to the other end of the trigger button S1 through the normally closed contact of the relay KA, the other end of the second indicator light L2 is connected to the other end of the input portion, and the connection end point of the second indicator light L2 is used for connecting a cable to be detected.
6. The transformer low-voltage wiring detection circuit as claimed in claim 3, further comprising a buzzer BUZ1, wherein one end of the buzzer BUZ1 is connected with the other end of the trigger button S1 through a normally open contact of the relay KA, the other end of the buzzer BUZ1 is connected with the other end of the input part, and the connection end point of the buzzer BUZ1 is used for connecting a cable to be detected.
7. The transformer low voltage wiring detection circuit according to claim 4, wherein the relay KA is a 24V intermediate relay; the first resistor R1 is 20 Ω.
8. A PCB board, characterized in that the PCB board is printed with the transformer low-voltage wiring detection circuit of any one of claims 1 to 7.
9. The transformer low-voltage wiring detection device is characterized by comprising a shell, wherein a 220V step-down transformer and the PCB board as claimed in claim 8 are arranged in the shell, a trigger button, a first indicator lamp, a second indicator lamp, a power interface, a first connecting port and a second connecting port are arranged on the shell, the trigger button, the power interface, the first connecting port, the second connecting port, the first indicator lamp and the second indicator lamp are respectively and electrically connected with the PCB board, the power interface is used for connecting a 220V power line, and the first connecting port and the second connecting port are used for connecting a cable to be detected.
10. The transformer low-voltage wiring detection device according to claim 9, wherein a buzzer is further disposed in the housing, and the buzzer is electrically connected to the PCB.
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