CN214751386U - Winding temperature rise test control device - Google Patents
Winding temperature rise test control device Download PDFInfo
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- CN214751386U CN214751386U CN202120166232.XU CN202120166232U CN214751386U CN 214751386 U CN214751386 U CN 214751386U CN 202120166232 U CN202120166232 U CN 202120166232U CN 214751386 U CN214751386 U CN 214751386U
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Abstract
The utility model discloses a winding temperature rise test control device can be arranged in the winding temperature rise test, realizes the measurement to the cold resistance value and the hot resistance value of quilt survey winding Lr. Utilize circuit conversion module will be surveyed winding Lr and release resistance R1 switch-on, pass through release resistance R1 with the high-pressure residual voltage when will being surveyed the winding Lr outage and release fast, and can utilize voltage safety inspection module P3 short-term test to be surveyed the both ends voltage of winding Lr and whether below safe voltage, just measure the hot resistance value of being surveyed winding Lr with winding resistance measuring equipment after the voltage is up to standard, so as to avoid high-pressure residual voltage to burn out winding resistance measuring equipment, and shorten and be surveyed the time between winding Lr outage to winding resistance measuring equipment measurement hot resistance value, consequently, the utility model discloses can help improving winding temperature rise test's security and test result accuracy.
Description
Technical Field
The utility model relates to a temperature rise test of winding, specifically speaking are experimental controlling means of winding temperature rise.
Background
The winding is an important component of electric elements such as a motor, a transformer and the like, and can play roles of excitation, transformation, electric isolation and the like. The winding generates a large amount of heat after being electrified, so that the temperature is increased, and the aging and insulation breakdown of the winding can be caused, and even the burning of the winding and the fire accident can occur. For electrical products with windings, a winding temperature rise test is often performed to ensure that the temperature rise of the windings does not exceed a limit value.
The winding temperature rise test usually adopts a resistance method, and needs to record the cold resistance value, the hot resistance value and the corresponding ambient temperature of the cold and hot states of the winding, and finally converts the temperature rise value of the winding through a specific formula. The key of measuring the temperature rise of the winding by using a resistance method is to measure the thermal resistance value of the winding, because the thermal resistance value of the winding needs to be pushed back at the power-off moment according to the time lapse after the power-off, in the practical test, the test equipment needs to be connected after the manual power-off, a preparation time is needed, the longer the preparation time is, the greater the heat loss of the winding in the time is, and the greater the deviation between the measured resistance value and the real power-off moment resistance is, so that a great deal of uncertainty and safety risks are brought to the test of the temperature rise of the winding, the safety risks are mainly shown in that a sample is not fully powered off or residual voltage is generated at two ends of the winding due to the existence of some energy storage components in the sample, the measurement equipment can be burnt out due to the overhigh voltage, and meanwhile, the potential safety hazard of electric shock also exists during the manual operation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: a winding temperature rise test control device is provided.
Solve above-mentioned technical problem, the utility model discloses the technical scheme who adopts as follows:
the utility model provides a winding temperature rise test controlling means which characterized in that: the winding temperature rise test control device comprises a circuit conversion module, a main control module P1, a driving module P2, a release resistor R1, a voltage safety detection module P3 and a direct current stabilized power supply module P4, and is provided with a winding end A and a winding end B for connecting a measured winding Lr, a live wire end C and a zero wire end D for accessing alternating current, and a measuring end E and a measuring end F for connecting winding resistance measuring equipment;
the main control module P1 can drive the circuit conversion module through the driving module P2, so as to realize the following on-off control of the circuit: firstly, the winding end A and the winding end B are controlled to be respectively connected with or disconnected from the live wire end C and the zero line end D; secondly, the winding end A and the winding end B are controlled to be connected with or disconnected from two ends of the release resistor R1 respectively; thirdly, controlling the winding end A and the winding end B to be connected with or disconnected from the measuring end E and the measuring end F respectively;
the release resistor R1 is connected between two measurement terminals of the voltage safety detection module P3, and the detection result of the voltage safety detection module P3 is output to the main control module P1;
the direct-current stabilized power supply module P4 can convert alternating current into direct current supplied by the winding temperature rise test control device.
Use the utility model discloses a winding temperature rise test controlling means carries out winding temperature rise test's step as follows:
step S1, connecting the winding Lr to be measured in series between the winding end A and the winding end B, respectively connecting the live wire end C and the zero line end D to the live wire and the zero line of the alternating current power supply, and respectively connecting the measuring end E and the measuring end F to two measuring terminals of winding resistance measuring equipment;
step S2, controlling the winding end A and the winding end B to be respectively connected with the measuring end E and the measuring end F, and respectively disconnected with the live wire end C, the zero line end D and the release resistor R1, so as to measure the cold resistance value of the measured winding Lr through the winding resistance measuring equipment;
step S3, controlling the winding end A and the winding end B to be respectively connected with the live wire end C and the zero wire end D, and controlling the winding end A and the winding end B to be disconnected with the measuring end E, the measuring end F and the release resistor R1, so that the winding Lr to be measured is electrified and heated;
step S4, when the temperature of the winding Lr to be tested reaches a target temperature condition, controlling the winding end A and the winding end B to be respectively connected with two ends of the release resistor R1 and disconnected with the live wire end C, the zero line end D, the measuring end E and the measuring end F so as to cut off the power of the winding Lr to be tested, and releasing the residual voltage of the winding Lr to be tested through the release resistor R1; meanwhile, the voltage safety detection module P3 automatically starts to detect the voltage across the winding Lr to be detected; and the target temperature condition is set according to the regulation of a winding temperature rise test of the winding Lr to be tested according to the relevant standard.
Step S5, when the voltage safety detection module P3 detects that the voltage across the winding Lr to be measured decreases below a preset safety voltage, the main control module P1 automatically controls the winding end a and the winding end B to be respectively connected to the measurement end E and the measurement end F, and to be disconnected from the live wire end C, the zero line end D, and the release resistor R1, so as to measure the thermal resistance value of the winding Lr to be measured by the winding resistance measurement device.
Therefore, through the winding temperature rise test, the cold resistance value and the hot resistance value of the winding Lr to be tested are measured, and the corresponding ambient temperature when the two resistance values are measured is measured, namely the temperature rise value of the winding Lr to be tested can be converted through a formula.
Preferably: the circuit conversion module comprises a contactor, a first relay and a second relay;
the live wire end C is connected with one end of the release resistor R1 through a first normally open contact QC01-1 of the contactor, a first normally closed contact K01-1 of the first relay, the winding end A and a first normally open contact K02-1 of the second relay in sequence, and the zero wire end D is connected with the other end of the release resistor R1 through a second normally open contact QC01-2 of the contactor, a second normally closed contact K01-3 of the first relay, the winding end B and a second normally open contact K02-2 of the second relay in sequence; the winding end A is connected with the measuring end E through a first normally open contact K01-2 of the first relay, and the winding end B is connected with the measuring end F through a second normally open contact K01-4 of the first relay;
the main control module P1 can respectively control the on/off of the coil QC01-3 of the contactor, the on/off of the coil K01-5 of the first relay, and the on/off of the coil K02-3 of the second relay through the driving module P2, so as to respectively realize the on/off state control of the normally-open contacts and the normally-closed contacts of the contactor, the first relay, and the second relay, thereby realizing the on/off control of the three circuits.
As a preferred embodiment of the present invention: the circuit conversion module also comprises a power switch and a third relay; the power switch comprises a first switch QF01-1 and a second switch QF01-2 of a linkage switch, the fire wire end C is connected with the zero wire end D sequentially through a coil QC01-3 of the contactor, a normally open contact K03-1 of the third relay and the second switch QF01-2, and a trigger signal receiving end (namely a pin P1.0) of the main control module P1 is connected with a ground end GND of the direct current stabilized power supply module P4 through the first switch QF 01-1; and when the trigger signal receiving terminal receives a ground signal and a breaking signal respectively, the main control module P1 controls the coil K03-2 of the third relay to be powered on and off through the driving module P2.
Thus, at the steps S2, S4 and S5, the first switch QF01-1 and the second switch QF01-2 of the power switch are opened by the tester, the normally open contact K03-1 of the third relay is also opened under the control of the main control module P1, so that the coil QC01-3 of the contactor is powered off, and the first normally open contact QC01-1 and the second normally open contact QC01-2 of the contactor are opened; and in the step S3, the first switch QF01-1 and the second switch QF01-2 of the power switch are closed by the tester, the trigger signal receiving end receives a ground signal through the closed first switch QF01-1, and the main control module P1 controls the coil K03-2 of the third relay to be electrified through the driving module P2 to control the normally open contact K03-1 of the third relay to be closed, so that the coil QC01-3 of the contactor is electrified through the closed second switch QF01-2 and the normally open contact K03-1, and the first normally open contact QC01-1 and the second normally open contact QC01-2 of the contactor are closed.
Thus, with the above circuit configuration, at step S4, a tester may manually open the first and second switches QF01-1 and QF01-2 of the power switch to open the first and second normally open contacts QC01-1 and QC01-2 of the contactor when it is judged by an external device that the temperature of the measured winding Lr reaches the target temperature condition.
Besides, the utility model discloses can also adopt following two kinds of modes, realize opening and closed control to the first normally open contact QC01-1 and the second normally open contact QC01-2 of contactor:
in the first mode, a power switch (namely, the first switch QF01-1 and the second switch QF01-2) is eliminated, a key circuit is adopted instead to send a trigger signal to a trigger signal receiving end of the main control module P1, and when the trigger signal generated by the key circuit is received, the main control module P1 controls the coil K03-2 of the third relay to be electrified through the driving module P2.
And in the second mode, a power switch (namely a first switch QF01-1 and a second switch QF01-2) is eliminated, a temperature detection device capable of monitoring the temperature of the detected winding Lr in real time is arranged, the temperature detection device outputs temperature data to the main control module P1, the main control module P1 judges whether the temperature of the detected winding Lr reaches a target temperature condition or not according to the received temperature data, and if the judgment is yes, the driving module P2 controls the coil K03-2 of the third relay to be electrified.
Preferably: the driving module P2 is provided with an independent driving circuit for each relay in the winding temperature rise test control device, the driving circuit includes a resistor R23, a resistor R24, a triode Q1 and a diode D4, the control end of the main control module P1 corresponding to the relay is connected with the emitter of the triode Q1 sequentially through the resistor R23 and the resistor R24, the base of the triode Q1 is connected with the connection point of the resistor R23 and the resistor R24, the collector of the triode Q1 is connected with the cathode of the diode D4, the anode of the diode D4 is connected with the ground terminal GND of the dc stabilized voltage power supply module P4, and the diode D4 is connected with the coil of the corresponding relay in parallel.
Preferably: the circuit conversion module, the main control module P1, the drive module P2, the release resistor R1, the voltage safety detection module P3 and the direct-current stabilized voltage power supply module P4 are all arranged on an electronic circuit board, the electronic circuit board is arranged inside a plastic shell, the winding end A, the winding end B, the live wire end C, the zero wire end D, the measuring end E and the measuring end F are respectively arranged on three side faces of the plastic shell, and the power switch is arranged on the top face of the plastic shell.
As a preferred embodiment of the present invention: the voltage safety detection module P3 comprises a first voltage comparator U2A, a fourth relay, a second voltage comparator U2B, a resistor R2 and a potentiometer RV 1;
the non-inverting input end and the inverting input end of the first voltage comparator U2A are used as two measurement terminals of the voltage safety detection module P3, and are respectively connected to two ends of the release resistor R1, and the output end of the first voltage comparator U2A is connected to the potential detection end (i.e., pin P3.2) of the main control module P1; the positive electrodes of the power supply terminals of the first voltage comparator U2A and the second voltage comparator U2B are both connected to the dc voltage output terminal VCC of the dc regulated power supply module P4, and the negative electrodes of the power supply terminals of the first voltage comparator U2A and the second voltage comparator U2B are both connected to the ground terminal GND of the dc regulated power supply module P4;
the inverting input end of the first voltage comparator U2A is divided into two paths, one path is connected with the ground end GND of the DC stabilized power supply module P4 through the first normally open contact K04-1 of the fourth relay, and the other path is connected with the non-inverting input end of the second voltage comparator U2B through the first normally closed contact K04-2 of the fourth relay; the non-inverting input end of the first voltage comparator U2A is divided into two paths, one path is connected with the non-inverting input end of the second voltage comparator U2B through a second normally open contact K04-3 of the fourth relay, and the other path is connected with the ground end GND of the DC stabilized power supply module P4 through a second normally closed contact K04-4 of the fourth relay; the master control module P1 can control the coil K04-5 of the fourth relay to be powered on or off through the driving module P2;
the resistor R2 and the potentiometer RV1 are connected in series between a direct-current voltage output end VCC and a ground end GND of the direct-current stabilized power supply module P4, and a sliding contact of the potentiometer RV1 is connected with an inverting input end of the second voltage comparator U2B; the output terminal of the second voltage comparator U2B is connected to the voltage safety detection terminal (i.e., pin P3.1) of the master control module P1 as the output terminal of the voltage safety detection module P3.
The working principle of the voltage safety detection module P3 is as follows:
in the step S4, when the signals received by the potential detection terminal are high level and low level, respectively, the main control module P1 controls the coil K04-5 of the fourth relay to be powered on and off; when the signal received by the voltage safety detection terminal is at a low level, the main control module P1 determines that: the voltage safety detection module P3 has detected that the voltage across the winding Lr under test has dropped below the safety voltage.
The voltage is divided by the resistor R2 and the potentiometer RV1 through the pre-adjustment potentiometer RV1, so that the voltage input to the inverting input end of the second voltage comparator U2B is used as the preset safety voltage.
When the potential of the winding Lr to be tested at the winding end a is higher than the potential of the winding Lr to be tested at the winding end B, the first voltage comparator U2A outputs a low level, the main control module P1 controls the coil K04-5 of the fourth relay to be powered off, the first normally closed contact K04-2 and the second normally closed contact K04-4 of the fourth relay are closed, so that the end with the lower potential of the winding Lr to be tested, that is, the winding end B, is connected to the ground terminal GND by the fourth relay, the end with the higher potential of the winding Lr to be tested, that is, the winding end a, is connected to the non-inverting input end of the second voltage comparator U2B by the fourth relay, and the comparison between the voltage of the winding Lr to be tested and the preset safe voltage by the second voltage comparator U2B is realized, when the voltage of the winding Lr to be detected is lower than the preset safety voltage, the second voltage comparator U2B outputs a low level to the voltage safety detection terminal of the main control module P1.
On the contrary, when the potential of the winding Lr to be detected at the winding end a is lower than the potential of the winding end B, the coil K04-5 of the fourth relay is energized, the first normally-open contact K04-1 and the second normally-open contact K04-3 of the fourth relay are closed, and the fact that the end with the lower potential of the winding Lr to be detected, that is, the winding end a, is connected to the ground terminal GND by the fourth relay is also realized, and the end with the higher potential of the winding Lr to be detected, that is, the winding end B, is connected to the non-inverting input end of the second voltage comparator U2B by the fourth relay.
As a preferred embodiment of the present invention: the structure of the direct-current stabilized power supply module P4 is as follows: the primary side of a transformer TR1 is connected between the live wire end C and the zero wire end D, the secondary side of the transformer TR1 is connected between two input terminals of a rectifier bridge RBR1, the anode of the output terminal of the rectifier bridge RBR1 is connected with the VI terminal of a voltage stabilizing chip U3 with the model number LM317, the VO terminal of the voltage stabilizing chip U3 is used as the DC voltage output end VCC of the DC voltage stabilizing power module P4, the ADJ terminal of the voltage stabilizing chip U3 is connected with one end of a resistor R3, the other end of the resistor R3 is used as the grounding end GND of the DC voltage stabilizing power module P4, a capacitor C1 is connected between the VI terminal and the grounding end of the voltage stabilizing chip U3, a capacitor C2 is connected in parallel with the capacitor C1, the cathode and the anode of a diode D1 are respectively connected with the VO terminal and the ADJ terminal of the voltage stabilizing chip U3, the resistor R4 is connected in parallel with a diode D1, the cathode and the anode of a diode D2 are respectively connected with the VI terminal and the VI terminal of the voltage stabilizing chip U3, the capacitor C3 is connected between the dc voltage output terminal VCC and the ground terminal GND.
As a preferred embodiment of the present invention: the main control module P1 is composed of a single chip microcomputer U1 with the model of STC89C52 and peripheral circuits thereof, has stable performance, low price and easy acquisition, and is widely used in the market.
Compared with the prior art, the utility model discloses following beneficial effect has:
first, the utility model discloses can be arranged in the winding temperature rise test, realize the measurement to the cold resistance value of being surveyed winding Lr and hot resistance value.
Second, the utility model discloses can utilize circuit conversion module will be surveyed winding Lr and release resistance R1 switch-on, pass through release resistance R1 quick release with the high-pressure residual voltage when will being surveyed the outage of winding Lr, and can utilize voltage safety detection module P3 short-term test to be surveyed the both ends voltage of winding Lr below safe voltage, just measure the hot resistance value of being surveyed winding Lr with winding resistance measuring equipment survey after voltage is up to standard, so that high-pressure residual voltage burns out winding resistance measuring equipment, and shorten and be surveyed winding Lr outage to the time between the winding resistance measuring equipment survey hot resistance value, consequently, the utility model discloses can help improving winding temperature rise test's security and test result accuracy.
Thirdly, the utility model has the advantages of simple structure, easy and simple to handle, safe and reliable.
Fourth, the utility model discloses a by the contactor, first relay, the circuit conversion module that the second relay constitutes realizes circuit on-off control, because the live wire end C and the zero line end D that insert alternating current power supply are connected to the first normally closed contact K01-1 and the second normally closed contact K01-3 of first relay, and the measuring terminal E and the measuring terminal F that insert winding resistance measuring equipment then are connected to the first normally open contact K01-2 and the second normally open contact K01-4 of first relay, make first relay for switch-on alternating current power supply with insert winding resistance measuring equipment and played the interlocking, the effectual winding resistance measuring equipment direct access alternating current power supply that has prevented and lead to the possibility that equipment burns out.
Fifth, the utility model discloses a voltage safety detection module P3 that comprises first voltage comparator U2A, fourth relay, second voltage comparator U2B, resistance R2 and potentiometre RV1, whether the both ends voltage that can automatic, quick detection judgement was surveyed winding Lr is below predetermined safe voltage, has the advantage that the reliability is high, with low costs.
Drawings
The invention will be described in further detail with reference to the following drawings and specific embodiments:
fig. 1 is a schematic circuit block diagram of a winding temperature rise test control device of the present invention;
fig. 2 is a schematic circuit diagram of the winding temperature rise test control device of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and the accompanying drawings to help those skilled in the art to better understand the concept of the present invention, but the scope of the claims of the present invention is not limited to the following embodiments, and all other embodiments obtained without creative work for those skilled in the art will fall within the scope of the present invention without departing from the scope of the present invention.
Example one
As shown in fig. 1 and fig. 2, the utility model discloses a winding temperature rise test control device, including circuit conversion module, main control module P1, drive module P2, release resistance R1, voltage safety detection module P3 and DC stabilized voltage power supply module P4, and be equipped with winding end A and winding end B that are used for connecting the winding Lr under test, live wire end C and zero line end D that are used for inserting the alternating current, be used for connecting winding resistance measuring equipment's measuring terminal E and measuring terminal F;
the main control module P1 can drive the circuit conversion module through the driving module P2, so as to realize the following on-off control of the circuit: firstly, the winding end A and the winding end B are controlled to be respectively connected with or disconnected from the live wire end C and the zero line end D; secondly, the winding end A and the winding end B are controlled to be connected with or disconnected from two ends of the release resistor R1 respectively; thirdly, controlling the winding end A and the winding end B to be connected with or disconnected from the measuring end E and the measuring end F respectively;
the release resistor R1 is connected between two measurement terminals of the voltage safety detection module P3, and the detection result of the voltage safety detection module P3 is output to the main control module P1;
the direct-current stabilized power supply module P4 can convert alternating current into direct current supplied by the winding temperature rise test control device.
Use the utility model discloses a winding temperature rise test controlling means carries out winding temperature rise test's step as follows:
step S1, connecting the winding Lr to be measured in series between the winding end A and the winding end B, respectively connecting the live wire end C and the zero line end D to the live wire and the zero line of the alternating current power supply, and respectively connecting the measuring end E and the measuring end F to two measuring terminals of winding resistance measuring equipment;
step S2, controlling the winding end A and the winding end B to be respectively connected with the measuring end E and the measuring end F, and respectively disconnected with the live wire end C, the zero line end D and the release resistor R1, so as to measure the cold resistance value of the measured winding Lr through the winding resistance measuring equipment;
step S3, controlling the winding end A and the winding end B to be respectively connected with the live wire end C and the zero wire end D, and controlling the winding end A and the winding end B to be disconnected with the measuring end E, the measuring end F and the release resistor R1, so that the winding Lr to be measured is electrified and heated;
step S4, when the temperature of the winding Lr to be tested reaches a target temperature condition, controlling the winding end A and the winding end B to be respectively connected with two ends of the release resistor R1 and disconnected with the live wire end C, the zero line end D, the measuring end E and the measuring end F so as to cut off the power of the winding Lr to be tested, and releasing the residual voltage of the winding Lr to be tested through the release resistor R1; meanwhile, the voltage safety detection module P3 automatically starts to detect the voltage across the winding Lr to be detected; and the target temperature condition is set according to the regulation of a winding temperature rise test of the winding Lr to be tested according to the relevant standard.
Step S5, when the voltage safety detection module P3 detects that the voltage across the winding Lr to be measured decreases below a preset safety voltage, the main control module P1 automatically controls the winding end a and the winding end B to be respectively connected to the measurement end E and the measurement end F, and to be disconnected from the live wire end C, the zero line end D, and the release resistor R1, so as to measure the thermal resistance value of the winding Lr to be measured by the winding resistance measurement device.
Therefore, through the winding temperature rise test, the cold resistance value and the hot resistance value of the winding Lr to be tested are measured, and the corresponding ambient temperature when the two resistance values are measured is measured, namely the temperature rise value of the winding Lr to be tested can be converted through a formula.
The above is a basic implementation manner of the first embodiment, and further optimization, improvement and limitation may be performed on the basis of the basic implementation manner:
preferably: the circuit conversion module comprises a contactor, a first relay and a second relay;
the live wire end C is connected with one end of the release resistor R1 through a first normally open contact QC01-1 of the contactor, a first normally closed contact K01-1 of the first relay, the winding end A and a first normally open contact K02-1 of the second relay in sequence, and the zero wire end D is connected with the other end of the release resistor R1 through a second normally open contact QC01-2 of the contactor, a second normally closed contact K01-3 of the first relay, the winding end B and a second normally open contact K02-2 of the second relay in sequence; the winding end A is connected with the measuring end E through a first normally open contact K01-2 of the first relay, and the winding end B is connected with the measuring end F through a second normally open contact K01-4 of the first relay;
the main control module P1 can respectively control the on/off of the coil QC01-3 of the contactor, the on/off of the coil K01-5 of the first relay, and the on/off of the coil K02-3 of the second relay through the driving module P2, so as to respectively realize the on/off state control of the normally-open contacts and the normally-closed contacts of the contactor, the first relay, and the second relay, thereby realizing the on/off control of the three circuits.
Therefore, the switching state control of the normally-open contacts and the normally-closed contacts of the contactor, the first relay and the second relay according to the following table 1 can realize steps S2 to S5 in the winding temperature rise test:
TABLE 1
Example two
On the basis of the first embodiment, the second embodiment further adopts the following preferred structure:
the circuit conversion module also comprises a power switch and a third relay; the power switch comprises a first switch QF01-1 and a second switch QF01-2 of a linkage switch, the fire wire end C is connected with the zero wire end D sequentially through a coil QC01-3 of the contactor, a normally open contact K03-1 of the third relay and the second switch QF01-2, and a trigger signal receiving end (namely a pin P1.0) of the main control module P1 is connected with a ground end GND of the direct current stabilized power supply module P4 through the first switch QF 01-1; and when the trigger signal receiving terminal receives a ground signal and a breaking signal respectively, the main control module P1 controls the coil K03-2 of the third relay to be powered on and off through the driving module P2.
Thus, at the steps S2, S4 and S5, the first switch QF01-1 and the second switch QF01-2 of the power switch are opened by the tester, the normally open contact K03-1 of the third relay is also opened under the control of the main control module P1, so that the coil QC01-3 of the contactor is powered off, and the first normally open contact QC01-1 and the second normally open contact QC01-2 of the contactor are opened; and in the step S3, the first switch QF01-1 and the second switch QF01-2 of the power switch are closed by the tester, the trigger signal receiving end receives a ground signal through the closed first switch QF01-1, and the main control module P1 controls the coil K03-2 of the third relay to be electrified through the driving module P2 to control the normally open contact K03-1 of the third relay to be closed, so that the coil QC01-3 of the contactor is electrified through the closed second switch QF01-2 and the normally open contact K03-1, and the first normally open contact QC01-1 and the second normally open contact QC01-2 of the contactor are closed.
Thus, with the above circuit configuration, at step S4, a tester may manually open the first and second switches QF01-1 and QF01-2 of the power switch to open the first and second normally open contacts QC01-1 and QC01-2 of the contactor when it is judged by an external device that the temperature of the measured winding Lr reaches the target temperature condition.
Besides, the utility model discloses can also adopt following two kinds of modes, realize opening and closed control to the first normally open contact QC01-1 and the second normally open contact QC01-2 of contactor:
in the first mode, a power switch (namely, the first switch QF01-1 and the second switch QF01-2) is eliminated, a key circuit is adopted instead to send a trigger signal to a trigger signal receiving end of the main control module P1, and when the trigger signal generated by the key circuit is received, the main control module P1 controls the coil K03-2 of the third relay to be electrified through the driving module P2.
And in the second mode, a power switch (namely a first switch QF01-1 and a second switch QF01-2) is eliminated, a temperature detection device capable of monitoring the temperature of the detected winding Lr in real time is arranged, the temperature detection device outputs temperature data to the main control module P1, the main control module P1 judges whether the temperature of the detected winding Lr reaches a target temperature condition or not according to the received temperature data, and if the judgment is yes, the driving module P2 controls the coil K03-2 of the third relay to be electrified.
The above is the basic implementation manner of the second embodiment, and further optimization, improvement and limitation can be made on the basis of the basic implementation manner:
preferably: the driving module P2 is provided with an independent driving circuit for each relay in the winding temperature rise test control device, the driving circuit includes a resistor R23, a resistor R24, a triode Q1 and a diode D4, the control end of the main control module P1 corresponding to the relay is connected with the emitter of the triode Q1 sequentially through the resistor R23 and the resistor R24, the base of the triode Q1 is connected with the connection point of the resistor R23 and the resistor R24, the collector of the triode Q1 is connected with the cathode of the diode D4, the anode of the diode D4 is connected with the ground terminal GND of the dc stabilized voltage power supply module P4, and the diode D4 is connected with the coil of the corresponding relay in parallel.
Preferably: the circuit conversion module, the main control module P1, the drive module P2, the release resistor R1, the voltage safety detection module P3 and the direct-current stabilized voltage power supply module P4 are all arranged on an electronic circuit board, the electronic circuit board is arranged inside a plastic shell, the winding end A, the winding end B, the live wire end C, the zero wire end D, the measuring end E and the measuring end F are respectively arranged on three side faces of the plastic shell, and the power switch is arranged on the top face of the plastic shell.
EXAMPLE III
On the basis of the first embodiment or the second embodiment, the third embodiment further adopts the following preferable structure:
the voltage safety detection module P3 comprises a first voltage comparator U2A, a fourth relay, a second voltage comparator U2B, a resistor R2 and a potentiometer RV 1;
the non-inverting input end and the inverting input end of the first voltage comparator U2A are used as two measurement terminals of the voltage safety detection module P3, and are respectively connected to two ends of the release resistor R1, and the output end of the first voltage comparator U2A is connected to the potential detection end (i.e., pin P3.2) of the main control module P1; the positive electrodes of the power supply terminals of the first voltage comparator U2A and the second voltage comparator U2B are both connected to the dc voltage output terminal VCC of the dc regulated power supply module P4, and the negative electrodes of the power supply terminals of the first voltage comparator U2A and the second voltage comparator U2B are both connected to the ground terminal GND of the dc regulated power supply module P4;
the inverting input end of the first voltage comparator U2A is divided into two paths, one path is connected with the ground end GND of the DC stabilized power supply module P4 through the first normally open contact K04-1 of the fourth relay, and the other path is connected with the non-inverting input end of the second voltage comparator U2B through the first normally closed contact K04-2 of the fourth relay; the non-inverting input end of the first voltage comparator U2A is divided into two paths, one path is connected with the non-inverting input end of the second voltage comparator U2B through a second normally open contact K04-3 of the fourth relay, and the other path is connected with the ground end GND of the DC stabilized power supply module P4 through a second normally closed contact K04-4 of the fourth relay; the master control module P1 can control the coil K04-5 of the fourth relay to be powered on or off through the driving module P2;
the resistor R2 and the potentiometer RV1 are connected in series between a direct-current voltage output end VCC and a ground end GND of the direct-current stabilized power supply module P4, and a sliding contact of the potentiometer RV1 is connected with an inverting input end of the second voltage comparator U2B; the output terminal of the second voltage comparator U2B is connected to the voltage safety detection terminal (i.e., pin P3.1) of the master control module P1 as the output terminal of the voltage safety detection module P3.
The working principle of the voltage safety detection module P3 is as follows:
in the step S4, when the signals received by the potential detection terminal are high level and low level, respectively, the main control module P1 controls the coil K04-5 of the fourth relay to be powered on and off; when the signal received by the voltage safety detection terminal is at a low level, the main control module P1 determines that: the voltage safety detection module P3 has detected that the voltage across the winding Lr under test has dropped below the safety voltage.
The voltage is divided by the resistor R2 and the potentiometer RV1 through the pre-adjustment potentiometer RV1, so that the voltage input to the inverting input end of the second voltage comparator U2B is used as the preset safety voltage.
When the potential of the winding Lr to be tested at the winding end a is higher than the potential of the winding Lr to be tested at the winding end B, the first voltage comparator U2A outputs a low level, the main control module P1 controls the coil K04-5 of the fourth relay to be powered off, the first normally closed contact K04-2 and the second normally closed contact K04-4 of the fourth relay are closed, so that the end with the lower potential of the winding Lr to be tested, that is, the winding end B, is connected to the ground terminal GND by the fourth relay, the end with the higher potential of the winding Lr to be tested, that is, the winding end a, is connected to the non-inverting input end of the second voltage comparator U2B by the fourth relay, and the comparison between the voltage of the winding Lr to be tested and the preset safe voltage by the second voltage comparator U2B is realized, when the voltage of the winding Lr to be detected is lower than the preset safety voltage, the second voltage comparator U2B outputs a low level to the voltage safety detection terminal of the main control module P1.
On the contrary, when the potential of the winding Lr to be detected at the winding end a is lower than the potential of the winding end B, the coil K04-5 of the fourth relay is energized, the first normally-open contact K04-1 and the second normally-open contact K04-3 of the fourth relay are closed, and the fact that the end with the lower potential of the winding Lr to be detected, that is, the winding end a, is connected to the ground terminal GND by the fourth relay is also realized, and the end with the higher potential of the winding Lr to be detected, that is, the winding end B, is connected to the non-inverting input end of the second voltage comparator U2B by the fourth relay.
Example four
On the basis of any one of the first to third embodiments, the fourth embodiment further adopts the following preferred structure:
the structure of the direct-current stabilized power supply module P4 is as follows: the primary side of a transformer TR1 is connected between the live wire end C and the zero wire end D, the secondary side of the transformer TR1 is connected between two input terminals of a rectifier bridge RBR1, the anode of the output terminal of the rectifier bridge RBR1 is connected with the VI terminal of a voltage stabilizing chip U3 with the model number LM317, the VO terminal of the voltage stabilizing chip U3 is used as the DC voltage output end VCC of the DC voltage stabilizing power module P4, the ADJ terminal of the voltage stabilizing chip U3 is connected with one end of a resistor R3, the other end of the resistor R3 is used as the grounding end GND of the DC voltage stabilizing power module P4, a capacitor C1 is connected between the VI terminal and the grounding end of the voltage stabilizing chip U3, a capacitor C2 is connected in parallel with the capacitor C1, the cathode and the anode of a diode D1 are respectively connected with the VO terminal and the ADJ terminal of the voltage stabilizing chip U3, the resistor R4 is connected in parallel with a diode D1, the cathode and the anode of a diode D2 are respectively connected with the VI terminal and the VI terminal of the voltage stabilizing chip U3, the capacitor C3 is connected between the dc voltage output terminal VCC and the ground terminal GND.
The main control module P1 is composed of a single chip microcomputer U1 with the model of STC89C52 and peripheral circuits thereof, has stable performance, low price and easy acquisition, and is widely used in the market.
The present invention is not limited to the above-mentioned embodiments, and according to the above-mentioned contents, according to the common technical knowledge and conventional means in the field, without departing from the basic technical idea of the present invention, the present invention can also make other equivalent modifications, replacements or changes in various forms, all falling within the protection scope of the present invention.
Claims (8)
1. The utility model provides a winding temperature rise test controlling means which characterized in that: the winding temperature rise test control device comprises a circuit conversion module, a main control module P1, a driving module P2, a release resistor R1, a voltage safety detection module P3 and a direct current stabilized power supply module P4, and is provided with a winding end A and a winding end B for connecting a measured winding Lr, a live wire end C and a zero wire end D for accessing alternating current, and a measuring end E and a measuring end F for connecting winding resistance measuring equipment;
the main control module P1 can drive the circuit conversion module through the driving module P2, so as to realize the following on-off control of the circuit: firstly, the winding end A and the winding end B are controlled to be respectively connected with or disconnected from the live wire end C and the zero line end D; secondly, the winding end A and the winding end B are controlled to be connected with or disconnected from two ends of the release resistor R1 respectively; thirdly, controlling the winding end A and the winding end B to be connected with or disconnected from the measuring end E and the measuring end F respectively;
the release resistor R1 is connected between two measurement terminals of the voltage safety detection module P3, and the detection result of the voltage safety detection module P3 is output to the main control module P1;
the direct-current stabilized power supply module P4 can convert alternating current into direct current supplied by the winding temperature rise test control device.
2. The winding temperature rise test control device of claim 1, characterized in that: the circuit conversion module comprises a contactor, a first relay and a second relay;
the live wire end C is connected with one end of the release resistor R1 through a first normally open contact QC01-1 of the contactor, a first normally closed contact K01-1 of the first relay, the winding end A and a first normally open contact K02-1 of the second relay in sequence, and the zero wire end D is connected with the other end of the release resistor R1 through a second normally open contact QC01-2 of the contactor, a second normally closed contact K01-3 of the first relay, the winding end B and a second normally open contact K02-2 of the second relay in sequence; the winding end A is connected with the measuring end E through a first normally open contact K01-2 of the first relay, and the winding end B is connected with the measuring end F through a second normally open contact K01-4 of the first relay;
the main control module P1 can respectively control the on and off of a coil QC01-3 of the contactor, the on and off of a coil K01-5 of the first relay and the on and off of a coil K02-3 of the second relay through the driving module P2.
3. The winding temperature rise test control device according to claim 2, characterized in that: the circuit conversion module also comprises a power switch and a third relay; the power switch comprises a first switch QF01-1 and a second switch QF01-2 of a linkage switch, the fire wire end C is connected with the zero wire end D sequentially through a coil QC01-3 of the contactor, a normally open contact K03-1 of the third relay and the second switch QF01-2, and a trigger signal receiving end of the main control module P1 is connected with a ground end GND of the DC stabilized power supply module P4 through the first switch QF 01-1; and when the trigger signal receiving terminal receives a ground signal and a breaking signal respectively, the main control module P1 controls the coil K03-2 of the third relay to be powered on and off through the driving module P2.
4. The winding temperature rise test control device of claim 3, characterized in that: the driving module P2 is provided with an independent driving circuit for each relay in the winding temperature rise test control device, the driving circuit includes a resistor R23, a resistor R24, a triode Q1 and a diode D4, the control end of the main control module P1 corresponding to the relay is connected with the emitter of the triode Q1 sequentially through the resistor R23 and the resistor R24, the base of the triode Q1 is connected with the connection point of the resistor R23 and the resistor R24, the collector of the triode Q1 is connected with the cathode of the diode D4, the anode of the diode D4 is connected with the ground terminal GND of the dc stabilized voltage power supply module P4, and the diode D4 is connected with the coil of the corresponding relay in parallel.
5. The winding temperature rise test control device of claim 3, characterized in that: the circuit conversion module, the main control module P1, the drive module P2, the release resistor R1, the voltage safety detection module P3 and the direct-current stabilized voltage power supply module P4 are all arranged on an electronic circuit board, the electronic circuit board is arranged inside a plastic shell, the winding end A, the winding end B, the live wire end C, the zero wire end D, the measuring end E and the measuring end F are respectively arranged on three side faces of the plastic shell, and the power switch is arranged on the top face of the plastic shell.
6. The winding temperature rise test control device according to any one of claims 1 to 5, characterized in that: the voltage safety detection module P3 comprises a first voltage comparator U2A, a fourth relay, a second voltage comparator U2B, a resistor R2 and a potentiometer RV 1;
the non-inverting input end and the inverting input end of the first voltage comparator U2A are used as two measurement terminals of the voltage safety detection module P3 and are respectively connected with two ends of the release resistor R1, and the output end of the first voltage comparator U2A is connected with the potential detection end of the main control module P1; the positive electrodes of the power supply terminals of the first voltage comparator U2A and the second voltage comparator U2B are both connected to the dc voltage output terminal VCC of the dc regulated power supply module P4, and the negative electrodes of the power supply terminals of the first voltage comparator U2A and the second voltage comparator U2B are both connected to the ground terminal GND of the dc regulated power supply module P4;
the inverting input end of the first voltage comparator U2A is divided into two paths, one path is connected with the ground end GND of the DC stabilized power supply module P4 through the first normally open contact K04-1 of the fourth relay, and the other path is connected with the non-inverting input end of the second voltage comparator U2B through the first normally closed contact K04-2 of the fourth relay; the non-inverting input end of the first voltage comparator U2A is divided into two paths, one path is connected with the non-inverting input end of the second voltage comparator U2B through a second normally open contact K04-3 of the fourth relay, and the other path is connected with the ground end GND of the DC stabilized power supply module P4 through a second normally closed contact K04-4 of the fourth relay; the master control module P1 can control the coil K04-5 of the fourth relay to be powered on or off through the driving module P2;
the resistor R2 and the potentiometer RV1 are connected in series between a direct-current voltage output end VCC and a ground end GND of the direct-current stabilized power supply module P4, and a sliding contact of the potentiometer RV1 is connected with an inverting input end of the second voltage comparator U2B; the output end of the second voltage comparator U2B is used as the output end of the voltage safety detection module P3 and is connected with the voltage safety detection end of the main control module P1.
7. The winding temperature rise test control device according to any one of claims 1 to 5, characterized in that: the structure of the direct-current stabilized power supply module P4 is as follows: the primary side of a transformer TR1 is connected between the live wire end C and the zero wire end D, the secondary side of the transformer TR1 is connected between two input terminals of a rectifier bridge RBR1, the anode of the output terminal of the rectifier bridge RBR1 is connected with the VI terminal of a voltage stabilizing chip U3 with the model number LM317, the VO terminal of the voltage stabilizing chip U3 is used as the DC voltage output end VCC of the DC voltage stabilizing power module P4, the ADJ terminal of the voltage stabilizing chip U3 is connected with one end of a resistor R3, the other end of the resistor R3 is used as the grounding end GND of the DC voltage stabilizing power module P4, a capacitor C1 is connected between the VI terminal and the grounding end of the voltage stabilizing chip U3, a capacitor C2 is connected in parallel with the capacitor C1, the cathode and the anode of a diode D1 are respectively connected with the VO terminal and the ADJ terminal of the voltage stabilizing chip U3, the resistor R4 is connected in parallel with a diode D1, the cathode and the anode of a diode D2 are respectively connected with the VI terminal and the VI terminal of the voltage stabilizing chip U3, the capacitor C3 is connected between the dc voltage output terminal VCC and the ground terminal GND.
8. The winding temperature rise test control device according to any one of claims 1 to 5, characterized in that: the main control module P1 is composed of a singlechip U1 with model STC89C52 and peripheral circuits thereof.
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| CN202120166232.XU CN214751386U (en) | 2021-01-21 | 2021-01-21 | Winding temperature rise test control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773037A (en) * | 2023-08-17 | 2023-09-19 | 合肥联宝信息技术有限公司 | Temperature rise detection circuit of transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773037A (en) * | 2023-08-17 | 2023-09-19 | 合肥联宝信息技术有限公司 | Temperature rise detection circuit of transformer |
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