Online test circuit and device for response time and resistance value of thermal resistor

Abstract

The utility model discloses a thermal resistor response time and resistance value on-line test circuit and device. The circuit comprises a four-way connecting piece used for on-line connection with a thermal resistor to be tested; the testing unit is used for outputting current for testing and collecting voltage between two paths of connecting pieces and current between the other two paths of connecting pieces; the first switching unit is connected with the testing unit and the four-way connecting piece and is used for switching a connecting path between the testing unit and the four-way connecting piece based on a Kelvin measurement method so as to test the resistance value of the thermal resistor; and the second switching unit is connected with the testing unit and the four-way connecting pieces, and is used for inputting current which enables the thermal resistor to generate heat to cause resistance change to the thermal resistor through two of the four-way connecting pieces and measuring the change of current and voltage at two ends of the thermal resistor through the testing unit so as to test the response time of the thermal resistor. According to the utility model, a worker can be assisted to carry out response time test and resistance test on the thermal resistor on line.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of thermal resistance, especially thermal resistance response time and resistance on -line test circuit and device. BACKGROUND

[0002] In nuclear power plant, in order to ensure that the reactor can realize shutdown in time when larger temperature transient change occurs, therefore need to use the thermal resistance that measurement is accurate, response time is fast to monitor the temperature change of nuclear reactor. However, the response time of traditional thermal resistance and resistance test is generally completed in laboratory using insertion method, which needs to remove the thermal resistance from the process environment, cannot reflect the influence of thermal resistance in the use process because of transportation, installation, use condition difference etc., such as the gap between thermometer element and sleeve, impurities etc. At present, an on-line thermal resistance response time and resistance testing scheme is urgently needed. UTILITY MODEL CONTENTS

[0003] The utility model solves the technical problem in, provide a kind of thermal resistance response time and resistance on-line test circuit and device.

[0004] The utility model solves the technical problem and adopts the technical scheme that: a kind of thermal resistance response time and resistance on-line test circuit is structured, comprising:

[0005] four-way connecting pieces for on-line connection of the thermal resistance to be measured;

[0006] test unit for outputting test current and collecting voltage between two of the connecting pieces and current between other two of the connecting pieces;

[0007] first switching unit connected with the test unit and four-way connecting pieces, for switching connection path between the test unit and four-way connecting pieces based on kelvin measurement method to test the thermal resistance resistance;

[0008] second switching unit connected with the test unit and four-way connecting pieces, for inputting current to the thermal resistance through two of the connecting pieces to make it heat and cause resistance value change, and measuring the change of current and voltage across the thermal resistance through the test unit to test the thermal resistance response time.

[0009] Preferably, the first switching unit comprises:

[0010] first switching unit connected with the current output and sampling positive terminal of the test unit and voltage collection positive terminal and first connecting piece, so that the first connecting piece is connected with the positive terminal of the test unit;

[0011] a second switch unit connected with the test unit and the second connecting member of the second path to connect the second connecting member of the second path with any one of the negative terminal or the positive terminal of the test unit; and

[0012] a third switch unit connected with the test unit and the third connecting member of the third path to connect the third connecting member of the third path with any one of the negative terminal or the positive terminal of the test unit; and

[0013] a fourth switch unit connected with the test unit and the fourth connecting member of the fourth path to connect the fourth connecting member of the fourth path with any one of the negative terminal or the positive terminal of the test unit.

[0014] Preferably, the first switch unit comprises:

[0015] a fifth relay K5, the fixed contact of which is connected with the current output and sampling positive terminal of the test unit, the normally closed contact of which is connected with the first connecting member of the first path, and the normally open contact of which is suspended; and

[0016] a sixth relay K6, the fixed contact of which is connected with the voltage collection positive terminal of the test unit, the normally closed contact of which is connected with the first connecting member of the first path, and the normally open contact of which is suspended;

[0017] the second switch unit comprises:

[0018] a seventh relay K7, the fixed contact of which is connected with the current output and sampling negative terminal of the test unit, the normally closed contact of which is connected with the second connecting member of the second path, and the normally open contact of which is suspended; and

[0019] an eighth relay K8, the fixed contact of which is connected with the voltage collection negative terminal of the test unit, the normally closed contact of which is connected with the second connecting member of the second path, and the normally open contact of which is suspended.

[0020] Preferably, the third switch unit comprises:

[0021] a ninth relay K9, the normally open contact of which is connected with the fixed contact of the sixth relay K6, and the normally closed contact of which is connected with the fixed contact of the eighth relay K8;

[0022] a thirteenth relay K13, the fixed contact of which is connected with the fixed contact of the ninth relay K9, the normally closed contact of which is connected with the third connecting member of the third path, and the normally open contact of which is suspended;

[0023] a tenth relay K10, the normally open contact of which is connected with the fixed contact of the fifth relay K5, and the normally closed contact of which is connected with the fixed contact of the seventh relay K7; and

[0024] a fourteenth relay K14, the fixed contact of which is connected with the fixed contact of the tenth relay K10, the normally closed contact of which is connected with the third connecting member of the third path, and the normally open contact of which is suspended;

[0025] The fourth switching unit comprises:

[0026] The eleventh relay K11 has its normally open contact connected to the normally open contact of the ninth relay K9, and its normally closed contact connected to the normally closed contact of the ninth relay K9;

[0027] The fifteenth relay K15 has its set contact connected to the set contact of the eleventh relay K11, its normally closed contact connected to the fourth of the connecting members, and its normally open contact left unconnected.

[0028] The twelfth relay K12 has its normally open contact connected to the normally open contact of the tenth relay K10, and its normally closed contact connected to the normally closed contact of the tenth relay K10; and

[0029] The sixteenth relay K16 has its set contact connected to the set contact of the twelfth relay K12, its normally closed contact connected to the fourth of the connecting members, and its normally open contact left unconnected.

[0030] Preferably, the second switching unit comprises:

[0031] The first relay K1 has its set contact and normally closed contact connected in series between the voltage collection positive terminal of the test unit and the set contact of the sixth relay K6, and its normally open contact connected to the first of the connecting members;

[0032] The second relay K2 has its set contact and normally closed contact connected in series between the voltage collection negative terminal of the test unit and the set contact of the eighth relay K8, and its normally open contact connected to the third of the connecting members;

[0033] The third relay K3 has its set contact and normally closed contact connected in series between the current output and sampling positive terminal of the test unit and the set contact of the fifth relay K5, its normally closed contact further connected to the normally open contact of the tenth relay K10, and its normally open contact connected to the second of the connecting members; and

[0034] The fourth relay K4 has its set contact and normally closed contact connected in series between the current output and sampling negative terminal of the test unit and the set contact of the seventh relay K7, its normally closed contact further connected to the normally closed contact of the tenth relay K10, and its normally open contact connected to the fourth of the connecting members.

[0035] Preferably, the hot resistance response time and resistance value on-line test circuit further comprises:

[0036] A switch control unit connected to the energizing coil of each relay comprised in the first switching unit and the second switching unit, for controlling the operation of each relay.

[0037] Preferably, the connecting members comprise Kelvin clamps.

[0038] Preferably, the test unit comprises a PLC controller.

[0039] Preferably, the PLC controller is a Siemens PLC controller with model AM06.

[0040] The utility model also constructs a kind of thermal resistance response time and resistance online testing device, including above thermal resistance response time and resistance online testing circuit.

[0041] The utility model has the advantages that provide a kind of thermal resistance response time and resistance online testing circuit, can assist staff to carry out response time test and resistance test to thermal resistance online, with the advantages such as simple circuit structure, resistance measurement accuracy higher. BRIEF DESCRIPTION OF DRAWINGS

[0042] The utility model will be further described below in conjunction with drawings and examples, and in the drawings:

[0043] Figure 1 It is the circuit schematic diagram of the thermal resistance response time and resistance online testing circuit in some embodiments of the utility model, and the circuit can assist staff to carry out response time test and resistance test to thermal resistance online, with the advantages such as simple circuit structure, resistance measurement accuracy higher.

[0044] Figure 2 It is the circuit schematic diagram of the test unit in some embodiments of the utility model, and the circuit can assist staff to carry out response time test and resistance test to thermal resistance online, with the advantages such as simple circuit structure, resistance measurement accuracy higher.

[0045] Figure 3 It is the circuit schematic diagram of the switch control unit in some embodiments of the utility model, and the circuit can assist staff to carry out response time test and resistance test to thermal resistance online, with the advantages such as simple circuit structure, resistance measurement accuracy higher.

[0046] Figure 4 It is the equivalent circuit schematic diagram for carrying out resistance test in some embodiments of the utility model, and the circuit can assist staff to carry out response time test and resistance test to thermal resistance online, with the advantages such as simple circuit structure, resistance measurement accuracy higher.

[0047] Figure 5 It is the equivalent circuit schematic diagram for carrying out response time test in some embodiments of the utility model, and the circuit can assist staff to carry out response time test and resistance test to thermal resistance online, with the advantages such as simple circuit structure, resistance measurement accuracy higher. DETAILED DESCRIPTION

[0048] In order to have more clear understanding to the technical features, purposes and effects of the utility model, present detailed description of the specific implementation mode of the utility model with reference to the drawings.

[0049] Figure 1 It is the circuit schematic diagram of the thermal resistance response time and resistance online testing circuit in some embodiments of the utility model, and the circuit can assist staff to carry out response time test and resistance test to thermal resistance online, with the advantages such as simple circuit structure, resistance measurement accuracy higher. Figure 1 As shown in the figure, the circuit includes test unit 2, first switching unit 3, second switching unit 4 and four-way connector 1.

[0050] The four-way connector 1 is used to connect the thermal resistance to be tested in line. Specifically, since the Kelvin measurement method (i.e. four-wire measurement method) is used to realize the resistance measurement, the four-way connector 1 is connected in parallel to both ends of the thermal resistance to input the test current and collect the voltage across the thermal resistance.

[0051] In some embodiments, as shown in Figure 4 The connector 1 can include a Kelvin clamp, so that the connector can be conveniently connected to the thermal resistance in line by clamping.

[0052] The test unit 2 is used to output the test current and collect the voltage between two of the four-way connectors 1 and the current between the other two of the four-way connectors 1. Specifically, after the four-way connector 1 is connected to the thermal resistance, when the resistance value is tested, the test unit 2 can provide the thermal resistance with the test current and collect the voltage between two of the four-way connectors 1 and the current through the other two of the four-way connectors 1, so as to calculate the real-time resistance value of the thermal resistance based on the Kelvin measurement method; when the response time is tested, the test unit 2 outputs a current with a longer duration than when the resistance value of the thermal resistance is measured, so as to make the thermal resistance generate Joule heat, increase the temperature of the thermal resistance itself, and then increase or decrease the resistance value of the thermal resistance, while monitoring the change of the resistance value of the thermal resistance from the time when the current is input, so as to evaluate the response time performance of the thermal resistance according to the change of the resistance value with time. It should be noted that the specific process of the thermal resistance response time test can also refer to the prior art, which will not be described here.

[0053] In some embodiments, as shown in Figure 2 The test unit 2 can include a PLC controller U1 and a DC power supply U11 connected to the PLC controller U1 for supplying power to the PLC controller U1.

[0054] In some embodiments, the PLC controller U1 can be a Siemens PLC controller with model AM06, and the PLC controller U1 includes a constant current output positive terminal AQ0, a constant current output negative terminal AQ0M, a current sampling positive terminal AI1+, a current sampling negative terminal AI1-, a voltage sampling positive terminal AI0+, and a voltage sampling negative terminal AI0-. The constant current output positive terminal AQ0 corresponds to the current output and sampling positive terminal of the test unit 2, as shown in Figure 1 The constant current output negative terminal AQ0M is short-circuited with the current sampling negative terminal AI1-, which is equivalent to the constant current source and ammeter in series in the PLC controller U1. Therefore, the current sampling positive terminal AI1+ as the positive terminal of the ammeter corresponds to the current output and sampling negative terminal of the test unit 2, the voltage sampling positive terminal AI0+ corresponds to the voltage collection positive terminal of the test unit 2, and the voltage sampling negative terminal AI0- corresponds to the voltage collection negative terminal of the test unit 2.

[0055] The first switching unit 3 is connected with the test unit 2 and the four-way connector 1, and is used for switching the connection path between the test unit 2 and the four-way connector 1 based on the Kelvin measurement method to test the resistance value of the thermal resistance. Specifically, please refer to Figure 4 After the four-way connector 1 is connected with the thermal resistance, the resistance R1 corresponds to the equivalent resistance of the first-way connector 1 connected to the test unit 2 through the first switching unit 3, the resistance R2 corresponds to the equivalent resistance of the second-way connector 1 connected to the test unit 2 through the first switching unit 3, the resistance R3 corresponds to the equivalent resistance of the third-way connector 1 connected to the test unit 2 through the first switching unit 3, and the resistance R4 corresponds to the equivalent resistance of the fourth-way connector 1 connected to the test unit 2 through the first switching unit 3. The first switching unit 3 switches the connection path between the test unit 2 and the four-way connector 1, so that the voltmeter and the ammeter in the test unit 2 are connected in parallel with the loop of the resistance R1 and the resistance R2 in series (R1+R2), the loop of the resistance R3 and the resistance R4 in series (R3+R4), the loop of the resistance R1, the thermal resistance RX and the resistance R3 in series (R1+RX+R3), the loop of the resistance R1, the thermal resistance RX and the resistance R4 in series (R1+RX+R4), the loop of the resistance R2, the thermal resistance RX and the resistance R3 in series (R2+RX+R3), and the loop of the resistance R2, the thermal resistance RX and the resistance R4 in series (R2+RX+R4) in turn. Thus, six groups of test currents and test voltages can be obtained. Then, based on the measurement values of the voltmeter and the ammeter, and based on the Ohm's law, six groups of equations can be obtained. Solving the six groups of equations can obtain the accurate resistance value of the thermal resistance RX.

[0056] In some embodiments, as shown in Figure 1 The first switching unit 3 includes a first switching unit 31, a second switching unit 32, a third switching unit 33 and a fourth switching unit 34. It should be noted that in the utility model, Figure 1 The four connectors 1 shown from left to right correspond to the first to fourth-way connectors 1 in turn.

[0057] The first switching unit 31 is connected with the current output and sampling positive terminal of the test unit 2, the voltage acquisition positive terminal and the first-way connector 1, and is used for connecting the first-way connector 1 with the positive terminal of the test unit 2. The positive terminal of the test unit 2 includes the current output and sampling positive terminal of the test unit 2 and the voltage acquisition positive terminal of the test unit 2.

[0058] In some embodiments, as shown in Figure 1As shown, the first switching unit 31 includes a fifth relay K5 and a sixth relay K6. The fixed contact of the fifth relay K5 is connected to the current output and sampling positive terminal of the test unit 2; the normally closed contact of the fifth relay K5 is connected to the first connector 1; and the normally open contact of the fifth relay K5 is left floating. The fixed contact of the sixth relay K6 is connected to the voltage acquisition positive terminal of the test unit 2; the normally closed contact of the sixth relay K6 is connected to the first connector 1; and the normally open contact of the sixth relay K6 is left floating. When the fifth relay K5 is demagnetized and the sixth relay K6 is energized, the current output and sampling positive terminal of the test unit 2 is connected to the first connector 1. When the fifth relay K5 is energized and the sixth relay K6 is demagnetized, the voltage acquisition positive terminal of the test unit 2 is connected to the first connector 1. When both the fifth relay K5 and the sixth relay K6 are energized, the first switching unit 31 is disconnected from the first connector 1.

[0059] The second switching unit 32 is connected to the current output and sampling negative terminal and the voltage acquisition negative terminal of the test unit 2, as well as the second connector 1. The second switching unit 32 is used to connect the second connector 1 to the negative terminal of the test unit 2. The negative terminal of the test unit 2 includes the current output and sampling negative terminal and the voltage acquisition negative terminal of the test unit 2.

[0060] In some embodiments, such as Figure 1 The second switching unit 32 includes a seventh relay K7 and an eighth relay K8. The fixed contact of the seventh relay K7 is connected to the current output and sampling negative terminal of the test unit 2, the normally closed contact of the seventh relay K7 is connected to the second connector 1, and the normally open contact of the seventh relay K7 is left floating. The fixed contact of the eighth relay K8 is connected to the voltage acquisition negative terminal of the test unit 2, the normally closed contact of the eighth relay K8 is connected to the second connector 1, and the normally open contact of the eighth relay K8 is left floating.

[0061] Please see Figure 1 When the seventh relay K7 is demagnetized and the eighth relay K8 is energized, the current output and sampling negative terminal of the test unit 2 are connected to the second connector 1. When the seventh relay K7 is energized and the eighth relay K8 is demagnetized, the voltage acquisition negative terminal of the test unit 2 is connected to the second connector 1. When both the seventh relay K7 and the eighth relay K8 are energized, the second switch unit 32 is disconnected from the second connector 1.

[0062] The third switch unit 33 is connected to the test unit 2 and the third connector 1. The third switch unit 33 is used to connect the third connector 1 to any negative or positive terminal of the test unit 2.

[0063] In some embodiments, such as Figure 1As shown, the third switch unit 33 includes a ninth relay K9, a tenth relay K10, a thirteenth relay K13 and a fourteenth relay K14. The normally open contact of the ninth relay K9 is connected to the fixed contact of the sixth relay K6, the normally closed contact of the ninth relay K9 is connected to the fixed contact of the eighth relay K8, the fixed contact of the thirteenth relay K13 is connected to the fixed contact of the ninth relay K9, the normally closed contact of the thirteenth relay K13 is connected to the third connecting piece 1, the normally open contact of the thirteenth relay K13 is suspended, the normally open contact of the tenth relay K10 is connected to the fixed contact of the fifth relay K5, the normally closed contact of the tenth relay K10 is connected to the fixed contact of the seventh relay K7, the fixed contact of the fourteenth relay K14 is connected to the fixed contact of the tenth relay K10, the normally closed contact of the fourteenth relay K14 is connected to the third connecting piece 1, and the normally open contact of the fourteenth relay K14 is suspended.

[0064] Please refer to Figure 1 In the case that the thirteenth relay K13 is de-energized and the fourteenth relay K14 is energized, if the ninth relay K9 is de-energized, the third connecting piece 1 is connected to the negative voltage collection end of the test unit 2, and if the ninth relay K9 is energized, the third connecting piece 1 is connected to the positive voltage collection end of the test unit 2; in the case that the thirteenth relay K13 is energized and the fourteenth relay K14 is de-energized, if the tenth relay K10 is de-energized, the third connecting piece 1 is connected to the negative current output and sampling end of the test unit 2, and if the tenth relay K10 is energized, the third connecting piece 1 is connected to the positive current output and sampling end of the test unit 2; when the thirteenth relay K13 and the fourteenth relay K14 are both energized, the third switch unit 33 is disconnected from the third connecting piece 1.

[0065] The fourth switch unit 34 is connected to the test unit 2 and the fourth connecting piece 1, and the fourth switch unit 34 is used to connect the fourth connecting piece 1 to any negative end or positive end of the test unit 2.

[0066] In some embodiments, as Figure 1As shown, the fourth switch unit 34 includes the eleventh relay K11, the fifteenth relay K15, the twelfth relay K12 and the sixteenth relay K16. The normally open contact of the eleventh relay K11 is connected to the normally open contact of the ninth relay K9, the normally closed contact of the eleventh relay K11 is connected to the normally closed contact of the ninth relay K9, the normally closed contact of the fifteenth relay K15 is connected to the normally closed contact of the eleventh relay K11, the normally open contact of the fifteenth relay K15 is left hanging, the normally open contact of the twelfth relay K12 is connected to the normally open contact of the tenth relay K10, the normally closed contact of the twelfth relay K12 is connected to the normally closed contact of the tenth relay K10, the normally open contact of the sixteenth relay K16 is left hanging, and the normally closed contact of the sixteenth relay K16 is connected to the fourth connecting member 1.

[0067] Please refer to Figure 1 In the case that the fifteenth relay K15 is excited and the sixteenth relay K16 is de-excited, if the eleventh relay K11 is de-excited, the fourth connecting member 1 is connected to the negative voltage collection end of the test unit 2, and if the eleventh relay K11 is excited, the fourth connecting member 1 is connected to the positive voltage collection end of the test unit 2; in the case that the fifteenth relay K15 is excited and the sixteenth relay K16 is de-excited, if the twelfth relay K12 is de-excited, the fourth connecting member 1 is connected to the negative current output and sampling end of the test unit 2, and if the twelfth relay K12 is excited, the fourth connecting member 1 is connected to the positive current output and sampling end of the test unit 2; when the fifteenth relay K15 and the sixteenth relay K16 are both excited, the fourth switch unit 34 is disconnected from the fourth connecting member 1.

[0068] The second switch unit 4 is connected to the test unit 2 and the four connecting members 1, and is used to input a current to the heat resistor through two connecting members 1 to cause the heat resistor to generate heat and change the resistance value, and measure the change of the current and voltage across the heat resistor through the test unit 2 to monitor the resistance value change of the heat resistor, and then test the response time of the heat resistor based on the resistance value change. Specifically, please refer to Figure 5After the four-way connector 1 is connected to the thermal resistance, the resistance R5 corresponds to the equivalent resistance of the second-way connector 1 connected to the test unit 2 through the second switching unit 4, the resistance R6 corresponds to the equivalent resistance of the first-way connector 1 connected to the test unit 2 through the second switching unit 4, the resistance R7 corresponds to the equivalent resistance of the third-way connector 1 connected to the test unit 2 through the second switching unit 4, and the resistance R8 corresponds to the equivalent resistance of the fourth-way connector 1 connected to the test unit 2 through the second switching unit 4. Under the action of the second switching unit 4, the ammeter, the constant current source and the thermal resistance RX in the test unit 2 are connected in series, and the voltmeter in the test unit 2 is connected in parallel with the thermal resistance RX. In this way, the real-time resistance value of the thermal resistance can be calculated based on the real-time readings of the voltmeter and the ammeter and combined with Ohm's law, and the resistance value change of the thermal resistance can be monitored. It should be noted that the test unit 2 has a very large internal resistance of the voltmeter and a small resistance value of the resistances R6 and R7, and the response time test mainly observes the change speed (i.e. response speed) of the resistance value of the thermal resistance, so the resistance value measurement accuracy requirement is lower than the resistance value test, and therefore the influence of the equivalent resistance can be ignored in the response time test.

[0069] In some embodiments, as shown in Figure 1 The first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 are connected in series between the voltage collection positive terminal of the test unit 2 and the fixed contact of the sixth relay K6, the normally open contact of the first relay K1 is connected to the first-way connector 1, the fixed contact and the normally closed contact of the second relay K2 are connected in series between the voltage collection negative terminal of the test unit 2 and the fixed contact of the eighth relay K8, the normally open contact of the second relay K2 is connected to the third-way connector 1, the fixed contact and the normally closed contact of the third relay K3 are connected in series between the current output and sampling positive terminal of the test unit 2 and the fixed contact of the fifth relay K5, the normally closed contact of the third relay K3 is also connected to the normally open contact of the tenth relay K10, the normally open contact of the tenth relay K10 is connected to the second-way connector 1, the fixed contact and the normally closed contact of the fourth relay K4 are connected in series between the current output and sampling negative terminal of the test unit 2 and the fixed contact of the seventh relay K7, the normally closed contact of the fourth relay K4 is also connected to the normally closed contact of the tenth relay K10, and the normally open contact of the fourth relay K4 is connected to the fourth-way connector 1.

[0070] Please refer to Figure 1 When the resistance value is tested, the first relay K1, the second relay K2, the third relay K3 and the fourth relay K4 are all de-energized, and on this basis, the connection between the four-way connector 1 and the test unit 2 is only controlled by the first switching unit 3. In this way, the voltage and current measured by the test unit 2 in the six test paths can be controlled by controlling the de-energization or energization of the relays in the first switching unit 3 (for reference Figure 4), i.e. 6 sets of measurement data are obtained to realize Kelvin measurement method, and then the resistance value of the thermal resistance is accurately calculated. When the response time test is performed, the first to eighth relays are energized, and the thirteenth to sixteenth relays are energized, so that the ammeter, the constant current source and the thermal resistance in the test unit 2 are connected in series, and the voltmeter in the test unit 2 is connected in parallel with the thermal resistance, i.e. an equivalent circuit as shown in Figure 5 is formed, so that according to Ohm's law, the readings of the voltmeter and the ammeter, the resistance value change of the thermal resistance can be calculated in real time, and then the response time performance of the thermal resistance is determined according to the resistance value change over time.

[0071] In some embodiments, as shown in Figure 3 , the thermal resistance response time and resistance value online test circuit further comprises a switch control unit 5, as shown in Figure 1 and Figure 3 The switch control unit 5 is connected with the energizing coils of each relay in the first switching unit 3 and the second switching unit 4 to control the energization or de-energization of each relay (i.e. the first to sixteenth relays) in the first switching unit 3 and the second switching unit 4. The switch control unit 5 can include an existing PLC controller.

[0072] The utility model also provides a thermal resistance response time and resistance value online test device, and the device comprises the thermal resistance response time and resistance value online test circuit provided by the utility model embodiment.

[0073] In some embodiments, the thermal resistance response time and resistance value online test device further comprises a housing for accommodating the first switching unit 3 and the second switching unit 4.

[0074] It can be understood that the above embodiments only express the preferred embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as a limitation on the patent scope of the utility model; it should be pointed out that for ordinary skilled persons in the art, the above technical features can be freely combined without departing from the concept of the utility model, and some deformations and improvements can be made, which all belong to the protection scope of the utility model; therefore, any equivalent transformation and modification within the scope of the claims of the utility model should belong to the scope of the claims of the utility model.

Claims

1. A thermal resistance response time and resistance on-line test circuit, characterized in that, The utility model relates to a four-way connector (1) for online connection of a thermal resistance to be tested, a test unit (2) for outputting a test current and collecting voltage between two of the four-way connector (1) and current between the other two of the four-way connector (1), a first switching unit (3) connected with the test unit (2) and the four-way connector (1) for switching connection paths between the test unit (2) and the four-way connector (1) based on the Kelvin measurement method to test the thermal resistance value, and a second switching unit (4) connected with the test unit (2) and the four-way connector (1) for inputting a test current to the thermal resistance through two of the four-way connector (1) to make the thermal resistance generate heat and change resistance value, and measuring the change of current and voltage across the thermal resistance through the test unit (2) to test the response time of the thermal resistance. The first switching unit (3) comprises a first switching unit (31) connected with the current output and sampling positive terminal and voltage collection positive terminal of the test unit (2) and the first of the four-way connector (1) to connect the first of the four-way connector (1) with the positive terminal of the test unit (2), a second switching unit (32) connected with the current output and sampling negative terminal and voltage collection negative terminal of the test unit (2) and the second of the four-way connector (1) to connect the second of the four-way connector (1) with the negative terminal of the test unit (2), a third switching unit (33) connected with the test unit (2) and the third of the four-way connector (1) to connect the third of the four-way connector (1) with any one of the negative terminal or the positive terminal of the test unit (2), and a fourth switching unit (34) connected with the test unit (2) and the fourth of the four-way connector (1) to connect the fourth of the four-way connector (1) with any one of the negative terminal or the positive terminal of the test unit (2). The first switching unit (31) comprises a fifth relay K5 with its fixed contact connected with the current output and sampling positive terminal of the test unit (2), its normally closed contact connected with the first of the four-way connector (1), and its normally open contact suspended, and a sixth relay K6 with its fixed contact connected with the voltage collection positive terminal of the test unit (2), its normally closed contact connected with the first of the four-way connector (1), and its normally open contact suspended. The second switching unit (32) comprises a seventh relay K7 with its fixed contact connected with the current output and sampling negative terminal of the test unit (2), its normally closed contact connected with the second of the four-way connector (1), and its normally open contact suspended, and an eighth relay K8 with its fixed contact connected with the voltage collection negative terminal of the test unit (2), its normally closed contact connected with the second of the four-way connector (1), and its normally open contact suspended. The third switching unit (33) comprises a ninth relay K9 with its normally open contact connected with the fixed contact of the sixth relay K6, and its normally closed contact connected with the fixed contact of the eighth relay K8, and a thirteenth relay K13 with its fixed contact connected with the fixed contact of the ninth relay K9, its normally closed contact connected with the third of the four-way connector (1), and its normally open contact suspended.

2. The thermal resistance response time and resistance on-line test circuit according to claim 1, characterized in that, The fourth switching unit (34) comprises a tenth relay K10 with its normally open contact connected with the fixed contact of the sixth relay K6, and its normally closed contact connected with the fixed contact of the eighth relay K8, and a fourteenth relay K14 with its fixed contact connected with the fixed contact of the tenth relay K10, its normally closed contact connected with the fourth of the four-way connector (1), and its normally open contact suspended. ​ ​ ​ ​ 3. The thermal resistance response time and resistance on-line test circuit according to claim 2, characterized in that, ​ ​ ​ ​ ​ ​ 4. The thermal resistance response time and resistance on-line test circuit according to claim 3, characterized in that, ​ ​ ​ a tenth relay K10, whose normally open contact connects the fixed contact of the fifth relay K5, and whose normally closed contact connects the fixed contact of the seventh relay K7; and a fourteenth relay K14, whose fixed contact connects the fixed contact of the tenth relay K10, whose normally closed contact connects the third of the connectors (1), and whose normally open contact is left open; the fourth switching unit (34) comprises: an eleventh relay K11, whose normally open contact connects the normally open contact of the ninth relay K9, and whose normally closed contact connects the normally closed contact of the ninth relay K9; a fifteenth relay K15, whose fixed contact connects the fixed contact of the eleventh relay K11, whose normally closed contact connects the fourth of the connectors (1), and whose normally open contact is left open; a twelfth relay K12, whose normally open contact connects the normally open contact of the tenth relay K10, and whose normally closed contact connects the normally closed contact of the tenth relay K10; and a sixteenth relay K16, whose fixed contact connects the fixed contact of the twelfth relay K12, whose normally closed contact connects the fourth of the connectors (1), and whose normally open contact is left open.

5. The thermal resistance response time and resistance on-line test circuit according to claim 4, characterized in that, the second switching unit (4) comprises: a first relay K1, whose fixed contact and normally closed contact are connected in series between the voltage collection positive terminal of the testing unit (2) and the fixed contact of the sixth relay K6, and whose normally open contact connects the first of the connectors (1); a second relay K2, whose fixed contact and normally closed contact are connected in series between the voltage collection negative terminal of the testing unit (2) and the fixed contact of the eighth relay K8, and whose normally open contact connects the third of the connectors (1); a third relay K3, whose fixed contact and normally closed contact are connected in series between the current output and sampling positive terminal of the testing unit (2) and the fixed contact of the fifth relay K5, whose normally closed contact further connects the normally open contact of the tenth relay K10, and whose normally open contact connects the second of the connectors (1); and a fourth relay K4, whose fixed contact and normally closed contact are connected in series between the current output and sampling negative terminal of the testing unit (2) and the fixed contact of the seventh relay K7, whose normally closed contact further connects the normally closed contact of the tenth relay K10, and whose normally open contact connects the fourth of the connectors (1).

6. The thermal resistance response time and resistance on-line test circuit according to claim 5, characterized in that, further comprising: a switching control unit (5) connected with the exciting coil of each relay comprised in the first switching unit (3) and the second switching unit (4), for controlling the operation of each relay.

7. The thermal resistance response time and resistance on-line test circuit according to claim 1, characterized in that, the connectors (1) comprise Kelvin clamps.

8. The thermal resistance response time and resistance on-line test circuit according to claim 1, characterized in that, the testing unit (2) comprises a PLC controller.

9. The thermal resistance response time and resistance on-line test circuit according to claim 8, characterized in that, the PLC controller is a Siemens PLC controller of model AM06.

10. An on-line testing device for response time and resistance of a thermal resistor, characterized in that, a thermal resistance response time and resistance online testing circuit according to any one of claims 1 to 9. a thermal resistance response time and resistance online testing circuit according to any one of claims 1 to 9.

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