CN206945850U - A kind of Insulation Resistance of Transformer, absorptance test emulation actual training device - Google Patents

Abstract

The utility model discloses a kind of Insulation Resistance of Transformer, absorptance test emulation actual training device, including high-pressure side binding post, low-pressure side binding post, ground terminal, megger test resistive load is connected with by controlling switch between the high-pressure side binding post and low-pressure side binding post, megger test resistive load is connected with by controlling switch between high-pressure side binding post and ground terminal, megger test resistive load is connected with by controlling switch between low-pressure side binding post and ground terminal, each controlling switch is electrically connected with the controller respectively, controller is used for the command signal output control signal according to operator, control closure or the disconnection of each controlling switch.It uses electronic circuit or module to substitute inside transformer structure, to realize the simulation of Insulation Resistance of Transformer, absorptance function, for teaching, training, has wide adaptation range, the power of consumption small, the features such as being actually consistent with scene.

Description

A simulation training device for transformer insulation resistance and absorption ratio test

technical field

The utility model relates to a training device, in particular to a simulation training device for testing insulation resistance and absorption ratio of transformers.

Background technique

Due to the material of the transformer, even a transformer with a capacity of only tens of KVA weighs more than 100 kilograms. Therefore, transporting a real transformer to the site will consume a lot of manpower, material resources and financial resources. Therefore, when conducting transformer function test training, the simulation model is usually used for training, and the simulation model for training can only understand the structure of the transformer, but for the detection, test and judgment of the transformer, the training with a certain technical content is difficult. Unable to proceed.

At the same time, even if a real transformer is transported to the site, the normal civil and industrial transformers on the site usually have a high-voltage input voltage of 10kV or above on the high-voltage side, which has a great impact on the training of transformer function tests security risks. In order to solve the above problems, the applicant designed an analog transformer, which can not only see the external structure of the transformer, but also has the function of the transformer, and can perform conventional electrical tests. Therefore, an electronic and electrical method is needed to realize the insulation resistance of the transformer. , Absorption ratio function simulation transformer insulation resistance, absorption ratio test simulation training device.

Contents of the invention

The purpose of this utility model is to provide a transformer insulation resistance and absorption ratio test simulation training device for the corresponding deficiencies of the prior art, which uses electronic and electrical methods, that is, electronic circuits or modules to replace the internal structure of the transformer, to realize the insulation resistance of the transformer. , The simulation of the absorption ratio function is used for teaching and training. It has the characteristics of wide adaptability, low power consumption, and conformity with the actual site. It is a good choice for electric power teaching, training demonstrations, etc. as teaching and practical training.

The purpose of this utility model is achieved by adopting the following scheme: a transformer insulation resistance, absorption ratio test simulation training device, including a high-voltage side terminal, a low-voltage side terminal, a grounding terminal, the high-voltage side terminal and the low-voltage side A resistive load for insulation resistance test is connected between the terminals through a control switch, a resistive load for insulation resistance test is connected between the high-voltage side terminal and the ground terminal through a control switch, and the low-voltage side terminal and the ground terminal A resistive load for insulation resistance testing is connected through a control switch, and each control switch is electrically connected to a controller, and the controller is used to output a control signal according to an operator's command signal to control the closing or opening of each control switch.

The two ends of the resistive load for the insulation resistance test are connected in parallel with the capacitive load for the insulation resistance test.

The resistive load for each insulation resistance test uses a resistor, and the capacitive load for each insulation resistance test uses a capacitor.

The simulation training device for transformer insulation resistance and absorption ratio test includes three groups of resistive loads for insulation resistance testing. The two ends of the second group of resistive loads for insulation resistance testing are electrically connected to the high-voltage side terminals and the grounding terminal respectively through the control switch, and the two ends of the third group of resistive loads for insulation resistance testing are respectively connected to the low-voltage side through the control switch. Connecting terminals and grounding terminals are electrically connected, and each group of resistive loads for insulation resistance testing includes one resistive load for testing insulation resistance or multiple resistive loads for testing insulation resistance, and multiple resistive loads for testing insulation resistance in each group The resistive loads for insulation resistance testing are connected in parallel, and multiple resistive loads for insulating resistance testing in each group of resistive loads for testing insulation resistance are respectively connected to the circuits where they are located through the control switches, so that the control switches control the load resistances connected to each circuit. value.

The first group of resistive loads for insulation resistance testing is composed of resistive loads for insulation resistance testing HV-R1, the second group of resistive loads for insulation resistance testing is composed of resistive loads for insulation resistance testing HV-R3, and the third group of insulating The resistive load for the resistance test is composed of the resistive load HV-R5 for the insulation resistance test. One end of the resistive load HV-R1 for the insulation resistance test is connected to the node A6 through the normally open contact of the relay K4. The other end of the resistance load HV-R1 is connected to the node a6 through the normally open contact of the relay K5, and the capacitive load CD2 for the insulation resistance test is connected in parallel with the resistive load HV-R1 for the insulation resistance test. One end of the resistive load HV-R3 is connected to the node A6 through the normally open contact of the relay K6, and the other end of the resistive load HV-R3 for insulation resistance test is connected to the node PE6 through the normally open contact of the relay K7. The capacitive load CD16 for testing is connected in parallel with the resistive load HV-R3 for testing insulation resistance. One end of the resistive load HV-R5 for testing insulation resistance is connected to node a6 through the normally open contact of relay K8. The other end of the resistance load HV-R5 is connected to the node PE6 through the normally open contact of the relay K9, the capacitive load CD35 for the insulation resistance test is connected in parallel with the resistive load HV-R5 for the insulation resistance test, the coils of the relay K4 and the relay K5 Both ends of the coils of relay K4 and relay K5 are electrically connected to the controller, one end of the coils of relay K6 and relay K7 are both grounded, and the other ends of the coils of relay K6 and relay K7 are electrically connected to the controller , one end of the coil of relay K8 and relay K9 is grounded, the other end of the coil of relay K8 and relay K9 is electrically connected to the controller, and nodes A6, a6, and PE6 are directly connected to the high-voltage side A terminal and the low-voltage side a terminal, grounding terminal, or node A6 is connected to the high-voltage side A terminal through the normally open contact of relay K1, and the node a6 is connected to the low-voltage side A terminal through the normally open contact of relay K2. The point PE6 is connected to the ground terminal through the normally open contact of the relay K3, one end of the coil of the relay K1, the coil of the relay K2, and the coil of the relay K3 are all grounded, and the coil of the relay K1, the coil of the relay K2, and the coil of the relay K3 The other end of each is electrically connected to the controller.

The transformer insulation resistance and absorption ratio test simulation training device includes two groups of resistive loads for insulation resistance testing. Terminals are electrically connected, and the two ends of the second group of resistive loads for insulation resistance testing are electrically connected to the high-voltage side terminals and grounding terminals through control switches; or the two ends of the first group of insulating resistance testing resistive loads are respectively connected through control switches Connected between the high-voltage side terminal and the low-voltage side terminal, the two ends of the resistive load for the second group of insulation resistance tests are respectively connected between the low-voltage side terminal and the grounding terminal through the control switch; or the first group of insulation resistance test The two ends of the resistive load are respectively connected between the high-voltage side terminal and the grounding terminal through the control switch, and the two ends of the resistive load for the second group of insulation resistance tests are respectively connected between the low-voltage side terminal and the grounding terminal through the control switch. Each group of resistive loads for insulation resistance testing includes one resistive load for testing insulation resistance or multiple resistive loads for testing insulation resistance, and multiple resistive loads for testing insulation resistance in each group of resistive loads for testing insulation resistance The loads are connected in parallel, and a plurality of resistive loads for insulation resistance testing in each group of resistive loads for testing insulation resistance are respectively connected to the loop through the control switch, so that the control switch controls the resistance value of the load connected to each loop.

The first group of resistive loads for testing insulation resistance includes a plurality of resistive loads for testing insulation resistance, the second group of resistive loads for testing insulation resistance includes multiple resistive loads for testing insulation resistance, and the first group of resistive loads for testing insulation resistance includes a plurality of resistive loads for testing insulation resistance. One end of the resistive load for each insulation resistance test of the load is connected to the node A10 through the normally open contact of the relay, and the other end of each resistive load for the insulation resistance test of the first group of insulation resistance tests is connected to the node A10. Point b10 is connected, one end of each resistive load for the second group of insulation resistance tests is connected to node C10 through the normally open contact of the relay, and each end of the resistive loads for the second group of insulation resistance tests is connected to the node C10. The other end of the resistive load for insulation resistance testing is connected to the node PE10, the node A10 is connected to the high voltage side terminal through the normally open contact of the relay, and the node C10 is connected to the high voltage side terminal through the normally open contact of the relay. The node b10 is connected to the low-voltage side terminal through the normally open contact of the relay, and the node PE10 is connected to the ground terminal through the normally open contact of the relay.

The transformer insulation resistance and absorption ratio test simulation training device is also provided with an anti-misoperation circuit. The input voltage between the low-voltage side terminal and the grounding terminal, and between the high-voltage side terminal and the grounding terminal are compared with the corresponding set values respectively. When the collected input voltage is greater than the set value, the control transformer insulation resistance, The corresponding control switch in the simulation training device of the absorption ratio test cannot be closed, so that the measurement of the corresponding insulation resistance cannot be carried out normally, and an alarm signal is output for an alarm prompt.

Voltage dividing circuits are respectively connected between the high-voltage side connecting terminal and the low-voltage side connecting terminal, between the low-voltage side connecting terminal and the grounding terminal, and between the high-voltage side connecting terminal and the grounding terminal, and each voltage dividing circuit is connected to the Between the high-voltage side terminal and the low-voltage side terminal, between the low-voltage side terminal and the ground terminal, between the high-voltage side terminal and the ground terminal, the voltage-dividing output terminals of each voltage-dividing circuit are respectively connected to the input terminals of the AD conversion module , the AD conversion module is used to respectively collect the divided voltages of the voltage dividing circuits, and convert them into digital signals and transmit them to the controller, and the controller is used to compare the digital signals transmitted by the AD conversion modules with the set values, When the digital signal transmitted by the AD conversion module is greater than the set value, the corresponding control switch in the control transformer insulation resistance and absorption ratio test simulation training device cannot be closed, so that the measurement of the corresponding insulation resistance cannot be carried out normally, and an alarm signal is output for alarm hint.

The controller communicates with the computer or the wireless remote controller for receiving command signals from the computer or the wireless remote controller, or the controller communicates with the touch screen for receiving command signals from the touch screen.

The utility model has the advantages that: the transformer insulation resistance and absorption ratio test simulation training device of the utility model adopts electronic and electrical methods, that is, electronic circuits or modules to replace the internal structure of a real transformer such as iron cores and coils, so as to realize transformer The simulation of insulation resistance and absorption ratio functions is used for teaching and training, and the test operation is also the same as the actual transformer. The device has the characteristics of wide adaptability, low power consumption, and conformity with the actual situation on site. It is a good choice for electric power teaching, training demonstration, etc. as teaching and practical training.

Due to the different types of megohmmeters, such as: 5000V, 2500V, 1000V, 500V, etc., in order to prevent the misuse of megohmmeters with higher voltages, which will cause breakdown of the capacitance in the test part of the circuit, the utility model has designed an anti-misoperation circuit, The anti-misoperation circuit includes a controller, and the controller is used to separately collect input between the high-voltage side terminal and the low-voltage side terminal, between the low-voltage side terminal and the ground terminal, and between the high-voltage side terminal and the ground terminal. Voltage, and compared with the corresponding set value respectively, when the collected input voltage is greater than the set value, the corresponding control switch in the training module for the control transformer insulation resistance test cannot be closed, so that the measurement of the corresponding insulation resistance cannot be carried out normally , and output an alarm signal for alarm prompt.

Apply the practical training device for transformer insulation resistance test of the present utility model to "simulated transformer", so that the simulated transformer has both the shape of the transformer and the external structure of the transformer; The utility model "simulated transformer" for skill training can effectively improve the training and teaching effect, making it easier for students to master the transformer structure, principle and test method; save manpower, material resources and time costs in education and training, and improve the comprehensiveness of education and training benefit. Through training, employees can consolidate and improve their professional knowledge and skills, master the standardized operating procedures of related work, improve work efficiency and enterprise benefits, and reduce accidents.

Description of drawings

Fig. 1 is the schematic diagram of the principle of the analog transformer of the present utility model;

Fig. 2 is a kind of embodiment of the schematic diagram of the practical training module of transformer insulation resistance test of the present utility model;

Fig. 3 is another embodiment of the schematic diagram of the practical training module for the transformer insulation resistance test of the present invention;

Fig. 4 is the schematic diagram of the anti-misoperation circuit of the utility model;

Fig. 5 is a kind of embodiment of the schematic diagram of the practical training module of transformer capacity test of the present utility model;

Fig. 6 is another embodiment of the schematic diagram of the practical training module for transformer capacity testing of the present utility model;

Fig. 7 is the schematic diagram of the transformer transformation ratio test module of the present invention;

Fig. 8 is the schematic diagram of the transformer DC resistance test module of the present invention;

Fig. 9 is a schematic diagram of a training module for transformer loss testing of the present invention.

detailed description

The transformer insulation resistance and absorption ratio test simulation training device disclosed in the utility model can be set as a separate device, which also has a power supply module, a controller, a simulation transformer housing, etc., and only realizes the insulation resistance and absorption ratio function simulation. It can also be set in a simulated transformer casing together with other training devices for simulating functions, and share the power supply module, controller, casing, etc. to form a simulated transformer together.

Referring to Fig. 1 to Fig. 9, this embodiment discloses an analog transformer, which includes high-voltage side terminals (A, B, C), low-voltage side terminals (a, b, c, N), grounding terminals, One or more of controller, power supply module, training module for transformer capacity test, training module for transformer insulation resistance test, training module for transformer loss test, module for transformer ratio test, and module for transformer DC resistance test kind. The power module is used to supply power to the whole device. The power module is used to convert 220V AC into 24V DC voltage and 5V DC voltage. The controller of the utility model adopts a PLC control panel. Preferably, all control switches in the utility model adopt relays. Certainly the control switch of the present utility model can also adopt other switches that can be controlled by the controller. The utility model controls the control switch in each test training module through the controller, thereby controlling the opening of each test training module and controlling the connection or disconnection of each test training module with the corresponding terminal, so that each test can be performed. The training modules for each test do not interfere with each other during the various tests. The resistive load is a load with a resistance value and is not limited to a resistor. The capacitive load may be a capacitor, and the inductive load may be an inductor or a transformer.

The analog transformer may not be equipped with command input devices (such as buttons, touch screens, etc.) and prompt devices (such as sound and light, etc., which can be display screens), etc. The controller of the analog transformer can communicate with a computer or other equipment such as a wireless remote control in a live or wireless way, and the operator sends an instruction signal through the computer or other equipment and transmits it to the computer in a live or wireless way. A controller that simulates a transformer. Of course, the analog transformer can also be provided with command input devices (such as buttons, touch screens, etc.) and prompt devices (such as sound and light, etc., which can be display screens), which are respectively connected to the controller of the analog transformer. The command signal is input through the command input device, and the alarm or status display is performed through the prompt device or the display device.

The training module for testing insulation resistance of transformers includes a resistive load for testing insulation resistance, and a resistive load for testing insulation resistance is connected between the high-voltage side terminal and the low-voltage side terminal through a control switch. A resistive load for insulation resistance test is connected between the terminal and the ground terminal through a control switch, and a resistive load for insulation resistance test is connected between the low-voltage side terminal and the ground terminal through a control switch. Each control switch of the module is electrically connected with the controller, and the controller is used to output a control signal according to an operator's command signal to control the closing or opening of each control switch of the training module for transformer insulation resistance testing. Both ends of the resistive load for insulation resistance testing are connected in parallel with capacitive loads for testing insulation resistance. Insulation resistance test with resistive load can realize the insulation test of simulated transformer. Setting the capacitive load for the insulation resistance test and the resistive load for the insulation resistance test in parallel can realize the simulation transformer absorption ratio test, which can reduce the weight of the equipment and save costs while ensuring that the test is close to reality.

Referring to Fig. 2, the transformer insulation resistance test training module of an embodiment includes two groups of resistive loads for insulation resistance test, the first group of resistive loads for insulation resistance test in the two groups of insulation resistance test resistive loads The two ends are respectively connected between the high-voltage side terminal and the low-voltage side terminal through the control switch, and the two ends of the second group of insulation resistance test resistive loads in the two groups of insulation resistance test resistive loads are connected respectively through the control switch. Between the high voltage side terminal and the ground terminal; the two ends of the first group of insulation resistance test resistive loads in the two groups of insulation resistance test resistive loads are respectively connected between the high voltage side terminal and the low voltage side terminal through the control switch Between the two groups of resistive loads for insulation resistance testing, the two ends of the second group of resistive loads for insulation resistance testing are respectively connected between the low-voltage side terminal and the ground terminal through the control switch; the two groups of resistive loads for insulation resistance testing The two ends of the resistive load for the first group of insulation resistance tests in the load are respectively connected between the high-voltage side terminal and the ground terminal through the control switch, and the second group of the resistive loads for the two groups of insulation resistance tests Both ends of the resistive load are respectively connected between the low-voltage side connection terminal and the ground terminal through the control switch. Each group of resistive loads for insulation resistance testing includes one resistive load for testing insulation resistance or multiple resistive loads for testing insulation resistance, and multiple resistive loads for testing insulation resistance in each group of resistive loads for testing insulation resistance are connected in parallel , and a plurality of resistive loads for insulation resistance testing in each group of resistive loads for testing insulation resistance are respectively connected to the respective circuits through the control switch, so that the control switch controls the resistance value of the load connected to each circuit.

The two ends of the first group of resistive loads for insulation resistance testing in this embodiment are respectively connected between the high-voltage side terminal and the low-voltage side terminal through the control switch, and the two groups of insulation resistance Two ends of the second group of resistive loads for testing insulation resistance are respectively connected between the high-voltage side connection terminal and the grounding terminal through the control switch. Each group of resistive loads for insulation resistance testing includes a plurality of resistive loads for insulation resistance testing. The specific circuit of the training module for transformer insulation resistance testing in this embodiment is as follows: the first group of resistive loads for testing insulation resistance includes resistive loads R1, R2, and R3 for testing insulation resistance, and the second group of resistive loads for testing insulation resistance. The loads include resistive loads R4, R6, and R8 for insulation resistance testing. One end of resistive load R1 for insulation resistance testing is connected to node A10 through the normally open contact of relay J14, and the other end of resistive load R1 for insulation resistance testing is Connect with node b10. One end of the resistive load R4 for the insulation resistance test is connected to the node C10 through the normally open contact of the relay J14, and the other end of the resistive load R4 for the insulation resistance test is connected to the node PE10. One end of the resistive load R2 for the insulation resistance test is connected to the node A10 through the normally open contact of the relay J13, and the other end of the resistive load R2 for the insulation resistance test is connected to the node b10. One end of the resistive load R6 for the insulation resistance test is connected to the node C10 through the normally open contact of the relay J13, and the other end of the resistive load R6 for the insulation resistance test is connected to the node PE10. One end of the resistive load R3 for the insulation resistance test is connected to the node A10 through the normally open contact of the relay J12, and the other end of the resistive load R3 for the insulation resistance test is connected to the node b10. One end of the resistive load R8 for the insulation resistance test is connected to the node C10 through the normally open contact of the relay J12, and the other end of the resistive load R8 for the insulation resistance test is connected to the node PE10. The node A10 is connected to the terminal A of the high voltage side through the normally open contacts of the relays J10 and J11, and the node C10 is connected to the terminal C of the high voltage side through the normally open contacts of the relay J10. The node b10 is connected to the low-voltage side b terminal through the normally open contact of the relay J15. The node PE10 is connected to the ground terminal through the normally open contact of the relay J16.

When using the transformer insulation resistance test training module of this embodiment, short-circuit the terminals A, B, and C on the high-voltage side, and short-circuit the terminals a, b, and c on the low-voltage side. Test method: When measuring the high-voltage side to the low-voltage side, control J10/J11/J12/J13/J14/J15 to open; when measuring the high-voltage side to PE, control J10/J11/J12/J13/J14/J16; to test the low-voltage side to PE , to control J10/J11/J12/J13/J14/J15/J16 to open. The coil of the relay is controlled by the controller.

Referring to Fig. 3, the transformer insulation resistance test training module of an embodiment includes three groups of resistive loads for insulation resistance test, and the first group of resistive loads for insulation resistance test among the three groups of resistive loads for insulation resistance test The two ends are respectively connected between the high-voltage side terminal and the low-voltage side terminal through the control switch, and the two ends of the second group of the resistive load for the insulation resistance test in the three groups of insulation resistance test are connected respectively through the control switch. Between the high voltage side terminal and the ground terminal, the two ends of the third group of insulation resistance test resistive loads among the three groups of insulation resistance test resistive loads are respectively connected between the high voltage side terminal and the ground terminal through control switches. Each group of resistive loads for insulation resistance testing includes one resistive load for testing insulation resistance or multiple resistive loads for testing insulation resistance, and multiple resistive loads for testing insulation resistance in each group of resistive loads for testing insulation resistance are connected in parallel , and a plurality of resistive loads for insulation resistance testing in each group of resistive loads for testing insulation resistance are respectively connected to the respective circuits through the control switch, so that the control switch controls the resistance value of the load connected to each circuit.

Each group of resistive loads for insulation resistance testing in this embodiment includes one resistive load for insulation resistance testing. The specific circuit of the training module for transformer insulation resistance test of the present embodiment is as follows: one end of the resistive load HV-R1 for insulation resistance test is connected to node A6 through the normally open contact of relay K4, and the resistive load for insulation resistance test is The other end of HV-R1 is connected to node a6 through the normally open contact of relay K5, and the capacitive load CD2 for insulation resistance test is connected in parallel with the resistive load HV-R1 for insulation resistance test. One end of HV-R3 is connected to node A6 through the normally open contact of relay K6, and the resistive load for insulation resistance testing. The other end of HV-R3 is connected to node PE6 through the normally open contact of relay K7, and is used for insulation resistance testing. The capacitive load CD16 is connected in parallel with the resistive load HV-R3 for the insulation resistance test, one end of the resistive load HV-R5 for the insulation resistance test is connected to the node a6 through the normally open contact of the relay K8, and the resistive load for the insulation resistance test The other end of HV-R5 is connected with node PE6 through the normally open contact of relay K9. The capacitive load CD35 for insulation resistance test is connected in parallel with the resistive load HV-R5 for insulation resistance test. One ends of the coils of the relay K4 and the relay K5 are both grounded, and the other ends of the coils of the relay K4 and the relay K5 are connected to the output terminal OUTPUT0 of the controller. One ends of the coils of the relay K6 and the relay K7 are both grounded, and the other ends of the coils of the relay K6 and the relay K7 are connected to the output terminal OUTPUT1 of the controller. One ends of the coils of the relay K8 and the relay K9 are both grounded, and the other ends of the coils of the relay K8 and the relay K9 are connected to the output terminal OUTPUT2 of the controller. The nodes A6, a6, and PE6 can be directly connected to the high-voltage side A terminal, the low-voltage side a terminal, and the grounding terminal, respectively. Preferably, the node A6 is connected to the high-voltage side A terminal through the normally open contact of the relay K1, the node a6 is connected to the low-voltage side a terminal through the normally open contact of the relay K2, and the node PE6 is connected to the ground The terminals are connected through the normally open contact of the relay K3, one end of the coil of the relay K1, the coil of the relay K2, and the coil of the relay K3 are all grounded, and the other ends of the coil of the relay K1, the coil of the relay K2, and the coil of the relay K3 are respectively It is electrically connected with the output terminals OUTPUT6, OUTPUT7, OUTPUT8 of the controller. The controller can respectively control the power-on or power-off of the coil of the relay K1, the coil of the relay K2, and the coil of the relay K3.

When measuring insulation resistance, short-circuit the three phases of A, B, and C, and short-circuit the three-phases of a, b, and c. For example, when measuring the high-to-low insulation resistance of the transformer, the three phases of A, B, and C are short-circuited, and the three-phases of a, b, and c are short-circuited and then connected to both ends of the megohmmeter, which provides DC power. Therefore, when measuring the high-voltage side to low insulation resistance, the high-voltage side to ground insulation resistance, and the low-voltage side to ground insulation resistance, A can be used to represent the high-voltage side, a to represent the low-voltage side, and PE to represent the ground. The utility model adopts the method of parallel connection of capacitors and resistors to replace transformer winding coils, which can reduce the weight of equipment and save costs on the premise of ensuring that the test is close to reality. At the same time, in order to enhance the practicability of the analog transformer, a set of spare circuits is added, and two students can operate the machine at the same time. Insulation resistance testing part of the circuit is as follows:

When measuring the high-to-low insulation resistance, the relays K1, K2, K4 and K5 are closed, and the other relays are disconnected. At this time, the high-to-low insulation resistance can be measured. The same method can measure the insulation resistance of the high-voltage side to the ground and the insulation resistance of the low-voltage side to the ground. The utility model can also carry out the absorption ratio test. The absorption ratio refers to the ratio of the measured insulation resistance when the megohmmeter is used to pressurize the transformer insulation for 60s and 15s. When measuring the insulation resistance, the magnitude of the insulation resistance at 60s and 15s can be obtained, and the ratio is the absorption ratio of the capacity transformer.

Due to the different types of megohmmeters, such as: 5000V, 2500V, 1000V, 500V, etc., in order to prevent the misuse of megohmmeters with higher voltages, which will cause breakdown of the capacitance in the test part of the circuit, the utility model has designed an anti-misoperation circuit, As shown in Figure 4, if the insulation resistance of PE is tested on the low-voltage side, it is stipulated to use a megohmmeter with a value of 500V. If a 1000V megger is used at this time, the anti-misoperation circuit can detect it, so that the corresponding control switch cannot be closed.

Referring to Fig. 4, the transformer insulation resistance test training module is also provided with an anti-misoperation circuit, and the anti-misoperation circuit includes a controller, and the controller is used to collect data between the high-voltage side terminal and the low-voltage side terminal respectively. , the input voltage between the low-voltage side terminal and the ground terminal, and between the high-voltage side terminal and the ground terminal, and compare them with the corresponding set values respectively. When the collected input voltage is greater than the set value, the control transformer insulation resistance The corresponding control switch in the test training module cannot be closed, so that the measurement of the corresponding insulation resistance cannot be carried out normally, and an alarm signal is output for alarm prompt.

A voltage dividing circuit is respectively connected between the high-voltage side connection terminal and the low-voltage side connection terminal, between the low-voltage side connection terminal and the ground terminal, and between the high-voltage side connection terminal and the ground terminal. Preferably, each voltage dividing circuit is respectively connected between the high-voltage side terminal and the low-voltage side terminal, between the low-voltage side terminal and the ground terminal, and between the high-voltage side terminal and the ground terminal through control switches. The voltage-dividing output ends of each voltage-dividing circuit are respectively connected to the input ends of the AD conversion module, and the AD conversion module is used to respectively collect the voltage after the voltage division of each voltage-dividing circuit, and convert it into a digital signal and transmit it to the controller. The controller is used to compare the digital signal transmitted by the AD conversion module with the set value. When the digital signal transmitted by the AD conversion module is greater than the set value, the corresponding control switch in the training module for the control transformer insulation resistance test cannot be closed, so that The measurement of the corresponding insulation resistance cannot be carried out normally, and an alarm signal is output for alarm prompt.

Referring to Fig. 4, the transformer insulation resistance test training module is also provided with an anti-misoperation circuit, and the anti-misoperation circuit includes three voltage divider circuits, one end of the first voltage divider circuit is connected to the high voltage by the normally open contact of the relay K16. The side A terminal is connected, and the other end of the first voltage dividing circuit is connected to the ground terminal through the normally open contact of the relay K16. The voltage division output terminal of the first voltage division circuit is connected with the first input terminal of the AD conversion module. One end of the second voltage dividing circuit is connected to the terminal A of the high voltage side through the normally open contact of the relay K17, and the other end of the second voltage dividing circuit is connected to the terminal a of the low voltage side through the normally open contact of the relay K17. The voltage dividing output terminal of the second voltage dividing circuit is connected with the second input terminal of the AD conversion module. One end of the third voltage dividing circuit is connected to the terminal a of the low voltage side through the normally open contact of the relay K18, and the other end of the third voltage dividing circuit is connected to the ground terminal through the normally open contact of the relay K18. The voltage dividing output terminal of the third voltage dividing circuit is connected with the third input terminal of the AD conversion module. When the digital signal transmitted by the AD conversion module is greater than the set value, the relays K1, K2, and K3 in the training module for testing the insulation resistance of the control transformer cannot be closed, so that the measurement of the corresponding insulation resistance cannot be carried out normally, and an alarm signal is output for alarm hint. One end of the coil of the relay K16, the coil of the relay K17, and the coil of the relay K18 are all grounded, and the other ends of the coil of the relay K16, the coil of the relay K17, and the coil of the relay K18 are respectively electrically connected to the output terminals OUTPUT9, OUTPUT10, and OUTPUT11 of the controller . The controller can respectively control the power-on or power-off of the coil of the relay K16, the coil of the relay K17, and the coil of the relay K18. Each voltage divider circuit consists of two resistors connected in series, or a rheostat device.

When measuring high-to-low insulation resistance, relay K17 is closed; when measuring high-to-ground insulation resistance, relay K16 is closed; when measuring low-to-ground insulation resistance, relay K18 is closed. The corresponding anti-misoperation circuit path.

Since the input voltage of the AD converter can only be between -5.12V and +5.12V, the size of resistor R1 and resistor R2 is selected as 1:1000 and a high-voltage resistor is selected, for example, R1=1M , R2=1000M , then according to the series voltage divider formula: Uin=U megohmmeter× . When U megger=±5000V, Uin≈±5.00V; when U megohmeter=±2500V, Uin≈±2.50V; when U megger=±500V, Uin≈±0.50V.

Use an AD converter to convert the analog signal into a digital signal, for example, use the ADC0809 converter module. The reference negative voltage of this module is "0V" by default, and the reference negative voltage needs to be adjusted to "-5.12V" through the program first (conditional). The module conversion chip has 8-way analog signal time-sharing acquisition ports IN0-IN7, and there are 8-way analog strobe switches and corresponding decoding circuits for channel address latches in the chip. The conversion time is about 100μs. According to the address latch and decoding circuit, the three address bits of ADDRO (A), ADDR1 (B), and ADDR2 (C) are latched and decoded, and the decoding output is used for channel selection, and the conversion result is output through the three-state The latch stores and outputs, so it can be directly connected to the system data bus. The channel selection table is as follows:

Known from the channel selection table, the three address bits corresponding to the acquisition ports IN0-IN2 of this design are: 000, 001 and 010. The converter is connected to the single-chip microcomputer, and the converted digital signal is transmitted to the single-chip microcomputer, so as to achieve the purpose of voltage acquisition and output. Then, the program controls the single-chip microcomputer to process the data, and controls the on-off of the circuit relay.

The input voltage Uin is compared with the reference quantity and the analog quantity is converted into a discrete signal represented by a binary value. The maximum value that the converter can quantify is 2^8=256 units, and the range is -5.12V～+5.12V, then the full-scale voltage is divided by the maximum quantization unit to get the analog voltage corresponding to a quantization unit, ΔU=(5.12- (-5.12)) V÷256=0.04V. Then, when the input voltage Uin is +5.00V, the corresponding decimal number is (5.00-(-5.12))÷0.04=253, and the corresponding binary number is 11111100. Similarly, when the output voltage Uin is -5.00V, the corresponding decimal number is (-5.00-(-5.12))÷0.04=3, and the corresponding binary number is 00000011; when the output voltage Uin is +2.50V, the corresponding binary number is 00111110; when the output voltage Uin is -2.50V, the corresponding binary is 01000001; when the output voltage Uin is +0.50V, the corresponding binary is 01110001; when the output voltage Uin is 0.99V, the corresponding binary is 10001110. Of course, the voltage of the hand-operated megohmmeter is unstable, and errors must exist, but the maximum voltage will not exceed the range of the megohmmeter.

When the input voltage is delayed for a certain period of time, and the digital signal is less than the binary number corresponding to the maximum working voltage of the circuit, the relays K16, K17, and K18 of the anti-misoperation circuit are controlled by the program to be disconnected, and the relays K1, K2, and relays of the insulation resistance test circuit are disconnected. When K3 is closed, the insulation resistance can be measured normally. After the test is completed, the relays K1, K2, and K3 of the insulation resistance test circuit are disconnected, and the relays K16, K17, and K18 of the anti-misoperation circuit are closed. When the digital signal is greater than the binary number corresponding to the maximum operating voltage of the circuit, K1, K2, and K3 cannot be closed through program control, and an alarm can be used. Any existing applicable alarm method can be used, such as display screen, sound and light, etc.

The training module for the transformer capacity test includes one or more of the resistive load for the capacity test, the capacitive load for the capacity test, and the inductive load for the capacity test, and each resistive load for the capacity test is connected to the Between each high-voltage side terminal, the capacitive load for each capacity test is connected between each high-voltage side terminal through the control switch, and the inductive load for each capacity test is respectively connected between each high-voltage side terminal through the control switch. Each control switch of the training module for capacity testing is electrically connected to the controller, and the controller is used to output a control signal according to the operator's instruction signal to control the closing or disconnection of each control switch of the training module for transformer capacity testing, Realize the capacity simulation of the transformer. The capacitive load for capacity test and the resistive load for capacity test set between two high-voltage side terminals are connected in series or in parallel, the inductive load for capacity test and resistive load for capacity test set between two high-voltage side terminals The loads are connected in series or in parallel, and the inductive load for capacity test and the capacitive load for capacity test are connected in series or in parallel between the two high-voltage side terminals, connected arbitrarily to form various combinations. The resistive load for capacity test, the inductive load for capacity test, and the capacitive load for capacity test which are set between the two high-voltage side terminals can be connected in series, three in parallel, two in series and another in parallel. It is also possible to connect two types in parallel and connect them in series with the other, and so on.

Referring to Fig. 5, a structure of the training module for transformer capacity testing is as follows: the training module for transformer capacity testing includes a resistive load for capacity testing and a capacitive load for capacity testing, which are arranged between two high-voltage side terminals The capacitive load for capacity test and the resistive load for capacity test are connected in parallel, so that the resistive load for capacity test and the capacitive load for capacity test form different combination access circuits, corresponding to simulate transformers with different capacities. Capacitive loads and resistive loads are used in series or in parallel to simulate transformer capacity. The test accuracy is extremely high, and more transformers with different capacities can be simulated by controlling the switch. It has a wide range of applications and is easy to design circuits. It is small in size, low in cost and stable in performance. .

In order to realize multiple capacity simulations of transformers, the transformer capacity test training module includes multiple groups of resistive loads for capacity testing, and each group of resistive loads for capacity testing includes a connection between the high-voltage side A terminal and the high-voltage side C terminal. The resistive load for the first capacity test, and the second resistive load for capacity testing between the high-voltage side B terminal and the high-voltage side C terminal, and the third between the high-voltage side A terminal and the high-voltage side B terminal Resistive load for capacity testing. One end of the resistive load for the first capacity test is electrically connected to the node A2, the other end of the resistive load for the first capacity test is electrically connected to the node C2, and the resistive load for the second capacity test is electrically connected to the node A2. One end is electrically connected to the node B2, the other end of the resistive load for the second capacity test is electrically connected to the node C2, one end of the resistive load for the third capacity test is electrically connected to the node A2, and the second end is electrically connected to the node A2. The other end of the resistive load for the three-capacity test is electrically connected to node B2, node A2 is connected to node A1 through the normally open contact of relay K5, and node B2 is connected to node B1 through the normally open contact of relay K26 , the node C2 is connected with the node C1 through the normally open contact of the relay K12. The coil of relay K5, the coil of relay K26, and one end of the coil of relay K12 are all grounded, and the other end of the coil of relay K5, coil of relay K26, and coil of relay K12 are connected with the DC voltage through the normally open contact of relay K19 (such as 5V), one end of the coil of the relay K19 is electrically connected to a DC voltage (such as 5V), and the other end of the coil of the relay K19 is electrically connected to the output end of the controller. The controller can control the power-on or power-off of the coil of the relay K19, and there is an indicator light prompting whether the coil of the relay K19 is powered on or not.

Referring to Fig. 5, the training module for the transformer capacity test also includes a capacitive load for the capacity test, at least one set of capacitive loads for the capacity test are connected between each high-voltage side terminal terminal through a control switch, and the two high-voltage side wiring terminals The capacitive load for capacity test and the resistive load for capacity test are connected in series or in parallel between the terminals, so that the resistive load for capacity test and the capacitive load for capacity test form different combination access circuits, corresponding to simulate transformers with different capacities . In order to realize multiple capacity simulations of transformers, the transformer capacity test training module includes multiple groups of capacitive loads for capacity testing, and each group of capacitive loads for capacity testing includes a connection between the high-voltage side A terminal and the high-voltage side C terminal. The capacitive load for the first capacity test, and the second capacitive load between the high-voltage side B terminal and the high-voltage side C terminal, and the third between the high-voltage side A terminal and the high-voltage side B terminal Capacitive load for capacity testing. One end of the capacitive load for the first capacity test is electrically connected to the node A3, the other end of the capacitive load for the first capacity test is electrically connected to the node C3, and the capacitive load for the second capacity test is electrically connected to the node A3. One end is electrically connected to the node B3, the other end of the capacitive load for the second capacity test is electrically connected to the node C3, one end of the capacitive load for the third capacity test is electrically connected to the node A3, and the second capacitive load is electrically connected to the node A3. The other end of the capacitive load for the three-capacity test is electrically connected to the node B3, the node A3 is connected to the node A1 through the normally open contact of the relay K49, and the node B3 is connected to the node B1 through the normally open contact of the relay K70 , the node C3 is connected to the node C1 through the normally open contact of the relay K56. One end of the coil of relay K49, coil of relay K70 and coil of relay K56 is all grounded, and the other end of the coil of relay K49, coil of relay K70 and coil of relay K56 is connected with the DC voltage through the normally open contact of relay K63 (such as 5V), one end of the coil of the relay K63 is electrically connected to a DC voltage (such as 5V), and the other end of the coil of the relay K63 is electrically connected to the output end of the controller. The controller can control the power-on or power-off of the coil of the relay K63, and an indicator light prompts whether the coil of the relay K63 is powered on or not.

Referring to Fig. 5, the nodes A1, B1, and C1 can be directly connected to the terminals A, B, and C on the high voltage side, respectively. Preferably, the node A1 is connected to the high voltage side A terminal through the normally open contact of the relay J5, the node B1 is connected to the high voltage side B terminal through the normally open contact of the relay J7, and the node C1 is connected to the high voltage side A terminal. The terminals on side C are connected through the normally open contact of relay J6, the coil of relay J5, the coil of relay J7, and one end of the coil of relay J6 are all grounded, and the coils of relay J5, coil of relay J7, and coil of relay J6 are grounded. The other end is electrically connected to the DC voltage (such as 5V) through the normally open contact of the relay K90, one end of the coil of the relay K90 is electrically connected to the DC voltage (such as 5V), and the other end of the coil of the relay K90 is connected to the output terminal of the controller electrical connection. The controller can control the power-on or power-off of the coil of the relay K90, and there is an indicator light to prompt whether the coil of the relay K90 is powered on or not. Diodes are connected in parallel at both ends of the coil of the relay, and the anodes of the diodes are grounded.

Capacitors are used for each capacitive load, and resistors are used for resistive loads.

The power transformer is composed of coil windings, but the coil can be divided into resistance and reactance in the analog circuit. In the transformer capacity test, we connect (short-circuit) the a/b/c/N terminals of the low-voltage side of the transformer respectively to form a loop. Phase, a voltage is provided by the transformer capacity tester, and the transformer capacity tester can test the capacity of the transformer.

The utility model simulates the capacity test of the simulated transformer using a combination of resistors and capacitors to respectively simulate the rated data of the power transformer, as shown in Figure 5, K5, K12, K19, K26, K49, K56, K63, K70, K90 are relays, R5, R12, R19 is a resistor, and CD5, CD12, and CD19 are capacitors. When simulating the transformer capacity test, when the operator selects the capacity test, the program commands K19, K63, and K90 to close, and at the same time, the relays that control other capacity combination circuits cannot be closed. At this time, K5, K12, K26, K49, K56, K70, J5, J6, and J7 are closed, and then connect the transformer capacity tester to the high voltage side for capacity testing. The function of K90 is to disconnect the state of K90 when the simulated transformer conducts power-on test, so as to prevent the voltage from entering and burning the test board.

The KM1 (Fig. 1) cannot be closed during capacity and insulation and loss tests.

There are several groups of capacitance and resistance combinations in the training module for transformer capacity testing, corresponding to simulated transformers with different capacities.

Referring to Fig. 6, another structure of the training module for transformer capacity testing is: the training module for transformer capacity testing includes a resistive load for capacity testing and an inductive load for capacity testing, which are arranged between the two high-voltage side terminals The inductive load for capacity test and the resistive load for capacity test are connected in series. The training module for transformer capacity testing includes one or more groups of inductive loads for capacity testing, each group of inductive loads for capacity testing includes the first inductive load for capacity testing, the second inductive load for capacity testing, and the third inductive load for capacity testing. inductive load.

In order to realize multiple capacity simulations of transformers, the transformer capacity test training module includes multiple sets of capacity test resistive loads, each set of capacity test resistive loads includes a first capacity test resistive load, a second capacity test Use a resistive load and a resistive load for the third capacity test. Each high-voltage side terminal is connected to nodes A4, B4, and C4 respectively. Preferably, a normally open contact of a relay J25 is provided between the nodes A4, B4, C4 and each of the high voltage side terminals. Nodes A4, B4, and C4 are respectively connected to one end of the resistive load for the first capacity test, the resistive load for the second capacity test, and the third resistive load for the capacity test, the resistive load for the first capacity test, the second The other ends of the resistive load for capacity testing and the third resistive load for capacity testing are respectively connected to nodes A5, B5 and C5 through the normally open contacts of relay J26. Nodes A5, B5, and C5 are respectively connected to one end of the inductive load for the first capacity test, the inductive load for the second capacity test, and the third inductive load for the capacity test, and the inductive load for the first capacity test and the inductive load for the second capacity test The other end of the load and the inductive load for the third capacity test are respectively connected to the terminals a, b, and c of the low-voltage side. During the test, the terminals a, b, and c on the low-voltage side need to be short-circuited with each other. Preferably, a normally open contact of a relay J29 is provided between the first inductive load for capacity testing, the second inductive load for capacity testing, and the third inductive load for capacity testing and each low-voltage side connection terminal. During the capacity test of this device, the connecting terminals on the low-voltage side need to be connected with wires, so that a loop is formed between the connecting terminals on the high-voltage side. Each relay is controlled by the controller respectively. Preferably, the resistive load is a resistor, and the inductive load is a transformer.

Referring to Fig. 7, the module for the transformer transformation ratio test includes a voltage divider circuit, and a voltage divider circuit is connected between the high-voltage side A, B, C terminals and the N terminal through a control switch, and the voltage divider output of each voltage divider circuit The terminals are respectively connected to the terminals a, b, and c of the low-voltage side through control switches, and the control switches of the transformer ratio test module are respectively electrically connected to the controller, and the controller is used to output control signals according to the operator's instruction signal. Control the closing or opening of each control switch of the module for transformer ratio test.

In order to realize multiple transformation ratio simulations of transformers, the transformer transformation ratio test module includes multiple voltage circuits, each of which has a different voltage division ratio, and each voltage circuit includes a high-voltage side A connection terminal and an N A first voltage dividing circuit between the terminals, a second voltage dividing circuit between the B terminal and the N terminal on the high voltage side, and a third voltage dividing circuit between the C terminal and the N terminal on the high voltage side. The multi-component voltage circuits are arranged in parallel between the high-voltage side terminal and the N terminal, and each component pressure circuit is switched by a control switch. Each voltage divider circuit consists of two resistors connected in series, or a rheostat device. The rheostat device can be a rheostat that manually adjusts the voltage division ratio, or a rheostat device that can adjust the voltage division ratio through a controller, such as a magnetron rheostat. The variable ratio test function simulation of the utility model adopts resistors. Because the resistance value of the resistors is adjustable and the precision is high, the precision of the voltage division ratio is also high, which is convenient for circuit design, small in size, low in cost and stable in performance. Such as simulating the transformation ratio of 10KVA/0.4KVA, the circuit of the utility model can quickly and accurately reach 10KVA/0.4KVA when tested with a transformation ratio tester after being debugged. When each voltage dividing circuit adopts a variable resistance device whose voltage dividing ratio can be adjusted by the controller, only one set of voltage dividing circuits needs to be arranged between the high-voltage side terminal and the N terminal.

Referring to FIG. 7 , the module for testing the transformation ratio of a transformer in this embodiment is provided with three sets of voltage circuits. One end of the first voltage divider circuit, the second voltage divider circuit, and the third voltage divider circuit of the first component pressure circuit of this embodiment are respectively connected to the nodes A7, B7, and C7 through the normally open contacts of the relay J3. The other ends of the first voltage divider circuit, the second voltage divider circuit and the third voltage divider circuit of the component voltage divider circuit are connected to the N connection terminal. The output ends of the first voltage divider, the second voltage divider and the third divider of each voltage divider are respectively connected to the nodes a7, b7, c7 through the normally open contacts of the relay J6. One end of the first voltage divider circuit, the second voltage divider circuit, and the third voltage divider circuit of the second component pressure circuit are respectively connected to the nodes A7, B7, and C7 through the normally open contacts of the relay J4. The other ends of the first voltage dividing circuit, the second voltage dividing circuit and the third voltage dividing circuit are connected to the N terminal. The output terminals of the first voltage divider, the second voltage divider and the third divider of each voltage divider are respectively connected to the nodes a7, b7, c7 through the normally open contact of the relay J7. One end of the first voltage divider circuit, the second voltage divider circuit, and the third voltage divider circuit of the third component pressure circuit are respectively connected to the nodes A7, B7, and C7 through the normally open contacts of the relay J5. The other ends of the first voltage dividing circuit, the second voltage dividing circuit and the third voltage dividing circuit are connected to the N terminal. The output terminals of the first voltage divider, the second voltage divider and the third divider of each voltage divider are respectively connected to the nodes a7, b7, c7 through the normally open contacts of the relay J8. Nodes A7, B7, and C7 are respectively connected to terminals A, B, and C on the high-voltage side. Preferably, a normally open contact of the relay J3 is provided between the nodes A7, B7, C7 and the terminals A, B, and C on the high voltage side. Nodes a7, b7, and c7 are respectively connected to the low-voltage side a, b, and c terminals. Preferably, a normally open contact of a relay J9 is provided between the nodes a7, b7, c7 and the low-voltage side a, b, c terminals. The utility model can control the power-on and power-off of the coils of each relay through the controller, and can also control the power-on and power-off of the coils of each relay through the tap switch SB1 on the transformer, and control the variable ratio to start the test.

This embodiment simulates three transformation ratio tests of the transformer. The first one is to turn on the tap changer SB1-0, and the controller automatically turns on J2/J3/J6/J9. The second one is to turn on the tap switch SB1-2. , the controller controls to automatically open J2/J4/J7/J9, the third is to open the tap changer SB1-0 gear, and the controller controls to automatically open J2/J5/J8/J9.

Referring to Figure 8, the transformer DC resistance test module includes a resistive load for DC resistance test, at least one set of resistive loads for DC resistance test is connected between each high-voltage side connection terminal through a control switch, and each low-voltage side connection terminal At least one group of resistive loads for DC resistance testing are connected through the control switches, and the control switches of the transformer DC resistance testing modules are respectively electrically connected to the controller, and the controller is used to output control signals according to the operator's instruction signal control the closing or opening of each control switch of the transformer DC resistance test module, and realize the resistance simulation between the windings of the transformer.

Referring to FIG. 8 , the transformer DC resistance test module in this embodiment includes three sets of resistive loads for high voltage side DC resistance test and three sets of low voltage side DC resistance test resistive loads. One end of the first set of resistive loads for high-voltage side DC resistance testing, the first high-voltage side DC resistance testing resistive load, the second high-voltage side DC resistance testing resistive load, and the third high-voltage side DC resistance testing resistive load The normally open contacts of the relay J18 are respectively connected to the nodes A8, B8, and C8. The first set of resistive loads for the high-voltage side DC resistance test, the resistive load for the first high-voltage side DC resistance test, and the second high-voltage side DC resistance The other end of the resistive load for testing and the resistive load for testing the DC resistance of the third high voltage side are both connected to the node A9. One end of the second set of resistive loads for high-voltage side DC resistance testing, the first high-voltage side DC resistance testing resistive load, the second high-voltage side DC resistance testing resistive load, and the third high-voltage side DC resistance testing resistive load The normally open contacts of the relay J19 are respectively connected to the nodes A8, B8, and C8. The second set of high-voltage side DC resistance test resistive loads, the first high-voltage side DC resistance test resistive load, and the second high-voltage side DC resistance The other end of the resistive load for testing and the resistive load for testing the DC resistance of the third high voltage side are both connected to the node A9. One end of the third set of resistive loads for high-voltage side DC resistance testing, the first high-voltage side DC resistance testing resistive load, the second high-voltage side DC resistance testing resistive load, and the third high-voltage side DC resistance testing resistive load The normally open contacts of the relay J20 are respectively connected to the nodes A8, B8, and C8, and the third group of high-voltage side DC resistance test resistive loads, the first high-voltage side DC resistance test resistive load, and the second high-voltage side DC resistance The other end of the resistive load for testing and the resistive load for testing the DC resistance of the third high voltage side are both connected to the node A9. Nodes A8, B8, and C8 are respectively connected to terminals A, B, and C on the high voltage side. Preferably, a normally open contact of a relay J17 is provided between the nodes A8, B8, C8 and the high voltage side A, B, C terminals.

One end of the first set of resistive loads for low-voltage side DC resistance testing, the first low-voltage side DC resistance testing resistive load, the second low-voltage side DC resistance testing resistive load, and the third low-voltage side DC resistance testing resistive load The normally open contacts of the relay J21 are respectively connected to the nodes a8, b8, and c8. The other end of the resistive load for testing and the resistive load for testing the DC resistance of the third low-voltage side are both connected to the N terminal. One end of the second set of resistive loads for low-voltage side DC resistance testing, the first low-voltage side DC resistance testing resistive load, the second low-voltage side DC resistance testing resistive load, and the third low-voltage side DC resistance testing resistive load The normally open contacts of the relay J22 are respectively connected to the nodes a8, b8, and c8, and the second group of low-voltage side DC resistance test resistive loads, the first low-voltage side DC resistance test resistive load, and the second low-voltage side DC resistance test The other end of the resistive load for testing and the resistive load for testing the DC resistance of the third low-voltage side are both connected to the N terminal. One end of the third set of resistive loads for low-voltage side DC resistance testing, the first low-voltage side DC resistance testing resistive load, the second low-voltage side DC resistance testing resistive load, and the third low-voltage side DC resistance testing resistive load The normally open contacts of the relay J23 are respectively connected to the nodes a8, b8, and c8, and the third group of low-voltage side DC resistance test resistive loads, the first low-voltage side DC resistance test resistive load, and the second low-voltage side DC resistance The other end of the resistive load for testing and the resistive load for testing the DC resistance of the third low-voltage side are both connected to the N terminal. The nodes a8, b8 and c8 are respectively connected to the terminals a, b and c of the low voltage side. Preferably, a normally open contact of a relay J24 is provided between the nodes a8, b8, c8 and the low voltage side a, b, c terminals.

The test method of the DC resistance in this embodiment is: the DC resistance is to measure the resistance between the windings, such as measuring the resistance between the windings on the high-voltage side and turning on J17, J18 or J17, J19 or J17, J20 to obtain R (AB), R (BC), R (AC), this is the high voltage side DC resistance test, similarly measure the resistance between the windings on the low voltage side, open J21, J24 or J22, J24 or J23, J24, get Rab, Rac, Rbc, Ran, Rbn, Rcn, this is the low voltage side DC resistance test.

Referring to Fig. 9, the training module for the transformer loss test includes a power conversion device and a power controllable load device, the input end of the power conversion device is connected to the high voltage side terminal, and the output end of the power conversion device is connected to the power The controllable load device is connected, the power conversion device is used to change the high voltage to low voltage and convert the AC voltage to DC voltage to supply power to the power controllable load device, and the power controllable load device is electrically connected to the controller , the controller is used to output a control signal according to an operator's instruction signal, adjust the power of the load device, and simulate the loss power of the transformer. The power conversion device may use a transformer and a rectifier module, or may use a switching power supply or the like.

The transformer loss test training module described in this embodiment includes a transformer T1, a transformer T2, a transformer T3, a rectifier module ZLQ1, a rectifier module ZLQ2, and a rectifier module ZLQ3. One end of the primary side of the transformer T1 is connected to the high-voltage side A terminal, and the transformer T2 One end of the primary side of the transformer T3 is connected to the terminal B of the high voltage side, one end of the primary side of the transformer T3 is connected to the C terminal of the high voltage side, the other ends of the primary sides of the transformers T1, T2, T3 are all connected to the N terminal, and the secondary side of the transformer T1 The two ends of the transformer T2 are respectively connected to the two input ends of the rectification module ZLQ1, the two ends of the secondary side of the transformer T2 are respectively connected to the two input ends of the rectification module ZLQ2, and the two ends of the secondary side of the transformer T3 are respectively connected to the rectification module ZLQ3 There is a capacitor C10 connected in series between the two output terminals of the rectifier module ZLQ1, a capacitor C2 is connected in series between the two output terminals of the rectifier module ZLQ2, and a capacitor is connected in series between the two output terminals of the rectifier module ZLQ3 C3, the capacitor C1, the capacitor C2, and the capacitor C2 are connected in series to the two input terminals of the power controllable load device. The rectification module adopts a rectification bridge.

The power controllable load device includes a DC governor and a resistive load for loss test, the input end of the DC governor is connected to the output end of the rectifier module, and the resistive loads for each loss test are connected to each other through each control switch. The regulating terminal of the DC speed regulator is connected, and the output terminal of the DC speed regulator is connected with a resistive load. The regulating end of the DC speed regulator can also be connected with a rheostat device with adjustable resistance, and the resistance value of the rheostat device can be adjusted by the controller.

Test principle: 380V three-phase power supply is added to the transformer loss test, the voltage is reduced to the range of 0-50V through the transformer, and the AC is converted into DC through the rectifier bridge. RI is a resistor with a certain resistance power to adjust the DC speed. For the converter, we use the controller to control the DC governor (KA+R combination) to make the power change to simulate the loss power of the power transformer.

A power-on test transformer is arranged between the high-voltage side terminal and the low-voltage side terminal, and the power-on test transformer is connected between the high-voltage side terminal and the low-voltage side terminal through a control switch. connected, the controller is used to output a control signal according to the operator's instruction signal, to control the closing or opening of the control switch, and to conduct the power-on test. The control switch adopts contactor KM1. Preferably, the transformer for the power-on test is an isolation transformer, and is a three-wire to four-wire transformer. After the control of each test training module and the corresponding terminal are disconnected, the KM1 can be controlled to close and the power-on test can be carried out. If a portable box is used, the transformer for the power-on test is generally not installed, that is, the power-on test cannot be carried out, and only the capacity, insulation, absorption ratio, and loss tests can be carried out. If the dummy shell is used, it can not only conduct capacity, insulation, absorption ratio, loss test, but also conduct electricity test.

The utility model also includes a transformer simulation casing, and each test training module, controller, and power supply module are all arranged in the transformer simulation casing. The simulated shell adopts the real transformer shell. The high-voltage-side connecting terminal and the low-voltage-side connecting terminal are respectively electrically connected to corresponding insulators on the dummy housing. Of course, each test training module, controller, and power supply module may not be arranged in the transformer simulation casing, but are additionally arranged in a separate cabinet, and the transformer simulation casing is fixed on the cabinet.

Each test training module, controller, and power supply module can also be set in a portable box, and the portable box is provided with high-voltage side A, B, C connection terminals, low-voltage side a, b, c, N connection terminals , grounding terminal, power terminal and communication terminal, touch screen, etc.

A protection circuit is provided between the power connection terminal and the power supply connection terminal of the analog transformer, and the protection circuit includes a circuit breaker, a leakage protector, and a second contactor KM2 arranged between the power supply connection terminal and the power supply connection terminal. After the power terminal is energized, the first indicator light is on, the circuit breaker is closed, the second indicator light is on, and the coil of the relay J1 is energized, the normally closed contact of the relay J1 is disconnected, and the first indicator light is off. The leakage protection is turned on, the third indicator light is on, and the coil of the second contactor KM2 is energized, the main contact of the second contactor KM2 is closed, the power supply terminal is energized, and the output supplies power to the power module. At this time, the second contactor KM2 The normally closed contact of the switch is disconnected, and the second indicator light goes out. A voltmeter and an ammeter are arranged between the power supply terminal and the power supply terminal.

This simulated transformer can not only see the external structure of the real transformer, but also has the transformer function to perform conventional electrical tests, such as capacity, absorption ratio, insulation resistance, transformation ratio, DC resistance, loss test, etc. The method is that the electronic circuit or module replaces the iron core and coil in the real transformer to realize the simulation of various functions of the transformer, and a simulated transformer can simulate different capacities and transformation ratios for teaching and training, and has a wide range of adaptability , Low power consumption, consistent with the actual situation on site, etc., it is a good choice for power teaching, training demonstrations, etc. as teaching and practical training. The structure and overall concept of each testing module of the utility model are also applicable to single-phase transformers.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (10)

1. a kind of Insulation Resistance of Transformer, absorptance test emulation actual training device, it is characterised in that：Including high pressure side terminal Son, low-pressure side binding post, ground terminal, pass through controlling switch between the high-pressure side binding post and low-pressure side binding post Megger test resistive load is connected with, is connected between the high-pressure side binding post and ground terminal by controlling switch There is megger test resistive load, be connected with absolutely by controlling switch between the low-pressure side binding post and ground terminal Edge resistance test resistive load, each controlling switch are electrically connected with the controller respectively, and the controller is used for according to operator's Command signal output control signal, control closure or the disconnection of each controlling switch.

2. Insulation Resistance of Transformer according to claim 1, absorptance test emulation actual training device, it is characterised in that：Absolutely Edge resistance test is parallel with megger test capacitive load with the both ends of resistive load.

3. Insulation Resistance of Transformer according to claim 1 or 2, absorptance test emulation actual training device, it is characterised in that： Each megger test uses resistance with resistive load, and each megger test uses capacitor with capacitive load.

4. Insulation Resistance of Transformer according to claim 1, absorptance test emulation actual training device, it is characterised in that：Become Depressor insulaion resistance, absorptance test emulation actual training device include three groups of megger test resistive loads, first group of insulation Resistance test is electrically connected by controlling switch and high-pressure side binding post, low-pressure side binding post respectively with the both ends of resistive load Connect, the both ends of second group of megger test resistive load pass through controlling switch and high-pressure side binding post, earth terminal respectively Son electrical connection, the both ends of the 3rd group of megger test resistive load respectively by controlling switch and low-pressure side binding post, Ground terminal electrically connects, and every group of megger test includes a megger test resistive load or multiple with resistive load Megger test resistive load, multiple megger tests in every group of megger test resistive load are with resistive negative Parallel connection is carried, and multiple megger test resistive loads in every group of megger test resistive load pass through control respectively Loop where switch access, controlling switch control is set to access the load resistance in each loop.

5. Insulation Resistance of Transformer according to claim 4, absorptance test emulation actual training device, it is characterised in that：The One group of megger test is made up of with resistive load megger test with resistive load HV-R1, and second group of insulaion resistance is surveyed Resistive load on probation is made up of megger test with resistive load HV-R3, the 3rd group of megger test resistive load by Megger test is formed with resistive load HV-R5, and megger test passes through relay K4 with resistive load HV-R1 one end Normally opened contact be connected with node A6, megger test passes through the normally opened of relay K5 with the resistive load HV-R1 other end Contact is connected with node a6, and megger test is in parallel with megger test resistive load HV-R1 with capacitive load CD2, The megger test is connected with resistive load HV-R3 one end by relay K6 normally opened contact with node A6, insulation Resistance test is connected with the resistive load HV-R3 other end by relay K7 normally opened contact with node PE6, and insulaion resistance is surveyed Capacitive load CD16 on probation is in parallel with resistive load HV-R3 with megger test, megger test resistive load HV-R5 One end be connected by relay K8 normally opened contact with node a6, the megger test resistive load HV-R5 other end It is connected by relay K9 normally opened contact with node PE6, megger test capacitive load CD35 and megger test In parallel with resistive load HV-R5, relay K4, relay K5 one end of coil are grounded, relay K4, relay K5 line The other end of circle is electrically connected with the controller, and relay K6, relay K7 one end of coil are grounded, relay K6, relay The other end of device K7 coil is electrically connected with the controller, and relay K8, relay K9 one end of coil are grounded, relay K8, the relay K9 other end of coil are electrically connected with the controller, node A6, a6, PE6 respectively directly with high-pressure side A wiring Terminal, low-pressure side a binding posts, ground terminal connection, or pass through relay K1 between node A6 and high-pressure side A binding posts Normally opened contact connection, connected between node a6 and low-pressure side a binding posts by relay K2 normally opened contact, node PE6 It is connected between ground terminal by relay K3 normally opened contact, relay K1 coil, relay K2 coil, relay One end of K3 coil is grounded, relay K1 coil, relay K2 coil, relay K3 coil the other end difference It is electrically connected with the controller.

6. Insulation Resistance of Transformer according to claim 1, absorptance test emulation actual training device, it is characterised in that：Institute State Insulation Resistance of Transformer, absorptance test emulation actual training device includes two groups of megger test resistive loads, first group The both ends of megger test resistive load pass through controlling switch and high-pressure side binding post, low-pressure side binding post electricity respectively Connection, the both ends of second group of megger test resistive load pass through controlling switch and high-pressure side binding post, ground connection respectively Terminal electrically connects；Or first group of megger test is connected to high-pressure side by controlling switch respectively with the both ends of resistive load Between binding post and low-pressure side binding post, the both ends of second group of megger test resistive load are opened by control respectively Connection is connected between low-pressure side binding post and ground terminal；Or the both ends of first group of megger test resistive load point It is not connected to by controlling switch between high-pressure side binding post and ground terminal, second group of megger test resistive load Both ends be connected to respectively by controlling switch between low-pressure side binding post and ground terminal, every group of megger test resistance Property load include a megger test resistive load or multiple megger test resistive loads, every group of insulaion resistance Multiple megger tests in test resistive load are in parallel with resistive load, and every group of megger test resistive load In multiple megger tests with resistive load respectively by controlling switch access where loop, make controlling switch control access The load resistance in each loop.

7. Insulation Resistance of Transformer according to claim 6, absorptance test emulation actual training device, it is characterised in that：The One group of megger test resistive load includes multiple megger test resistive loads, and second group of megger test is used Resistive load includes multiple megger test resistive loads, each insulated electro of first group of megger test resistive load One end of resistance test resistive load is connected by the normally opened contact of relay with node A10, and first group of megger test is used The other end of each megger test resistive load of resistive load is connected with node b10, and second group of megger test is used One end of each megger test resistive load of resistive load is connected by the normally opened contact of relay with node C10, the The other end of each megger test resistive load of two groups of megger test resistive loads is connected with node PE10, knot Point A10 is connected by the normally opened contact of relay with high-pressure side binding post, the normally opened contact and height that node C10 passes through relay Side terminal son connection is pressed, node b10 is connected by the normally opened contact of relay with low-pressure side binding post, and node PE10 passes through The normally opened contact of relay is connected with ground terminal.

8. Insulation Resistance of Transformer according to claim 1, absorptance test emulation actual training device, it is characterised in that：Institute State Insulation Resistance of Transformer, absorptance test emulation actual training device is additionally provided with Anti-misoperation circuit, the Anti-misoperation circuit bag Controller is included, the controller for gathering between high-pressure side binding post and low-pressure side binding post respectively, low-pressure side wiring Input voltage between terminal and ground terminal, between high-pressure side binding post and ground terminal, and respectively with corresponding setting Value is compared, when the input voltage of collection is more than setting value, control Insulation Resistance of Transformer, absorptance test emulation real training Corresponding controlling switch in device can not close, and prevent the measurement of corresponding insulaion resistance from being normally carried out, and output alarm signal Carry out alarm.

9. Insulation Resistance of Transformer according to claim 8, absorptance test emulation actual training device, it is characterised in that：Institute State between high-pressure side binding post and low-pressure side binding post, between low-pressure side binding post and ground terminal, high-pressure side wiring Bleeder circuit is connected between terminal and ground terminal, each bleeder circuit is connected to high pressure side joint by controlling switch Between line terminals and low-pressure side binding post, between low-pressure side binding post and ground terminal, high-pressure side binding post with ground connection Between terminal, the partial pressure output end of each bleeder circuit is connected with the input of AD conversion module respectively, and the AD conversion module is used Voltage after each bleeder circuit partial pressure is gathered respectively, and be converted into data signal and pass to controller, the controller is used for By the data signal of AD conversion module transmission compared with setting value, when the data signal of AD conversion module transmission is more than setting During value, the corresponding controlling switch in control Insulation Resistance of Transformer, absorptance test emulation actual training device can not close, and make corresponding The measurement of insulaion resistance can not be normally carried out, and output alarm signal carries out alarm.

10. Insulation Resistance of Transformer according to claim 1, absorptance test emulation actual training device, it is characterised in that：Institute Controller is stated to be communicated with computer or Digiplex, for receiving the command signal of computer or Digiplex, or Person, the controller are communicated with touch-screen, for receiving the command signal of touch-screen.