CN107271944B - A program-controlled current transformer automatic wiring device - Google Patents

Abstract

The invention discloses a full-automatic wiring device of a program-controlled current transformer, which comprises: the system comprises an auxiliary wiring platform, a two-stage current transformer, a current rising device, full-automatic wiring equipment, a control unit and a tested current transformer, wherein the control unit is connected with the auxiliary wiring platform, the two-stage current transformer, the current rising device, the full-automatic wiring equipment and the tested current transformer; the full-automatic wiring equipment automatically wires the current transformer to be tested, the two-stage current transformer and the current booster; the technical effects of improving the working efficiency and reducing the uncertainty of the measuring process are achieved.

Description

A program-controlled current transformer automatic wiring device

technical field

The invention relates to the field of power transmission, in particular to a fully automatic wiring device of a program-controlled current transformer.

Background technique

According to the regulations of JJG313-2010 "Current Transformers for Measurement", the current transformers of class 0.05 to 0.01 used as standard devices must be verified in a cycle of two years, and each change must be verified during verification. The current transformer used as a standard device generally has a transformation ratio range of 5 to 2000/5, 1A, an accuracy level of 0.05 to 0.01, a wide transformation ratio range, and different level requirements. In the actual verification, there will be a wrong wiring situation. , the work efficiency is low; in addition, in the process of verifying different transformation ratios of the same standard, because the wiring operators are not necessarily the same each time, and the connection of different transformation ratios is not necessarily good, it will lead to the same transformer being tested. The increased degree of certainty may result in a qualified transformer being considered unqualified.

SUMMARY OF THE INVENTION

The invention provides an automatic wiring device for a program-controlled current transformer, which solves the technical problems of low wiring efficiency and error-prone in the prior art, and realizes the use of the device in the application to realize automatic wiring with high efficiency and accuracy. technical effect.

In order to solve the problem that due to the wide range of standard transformation ratios and different grade requirements, the wrong wiring will occur in the actual verification, and the work efficiency is low; and in the verification process of different transformation ratios of the same standard It is not necessarily the same, and the connection of different transformation ratios is not necessarily good. Program-controlled current transformer automatic wiring device can improve work efficiency and reduce the uncertainty of the measurement process.

The object of the present invention is specifically realized through the following technical solutions:

A fully automatic wiring device for a program-controlled current transformer, comprising an auxiliary terminal connected to the tested current transformer, a two-stage standard current transformer, a current booster and a control unit. The two-stage current transformer and the current booster are automatically wired; the two-stage current transformer is connected in series with the primary side of the tested current transformer, and the secondary side signals of the two are compared; the current booster provides 0 to 6000A high current; the control unit is used to control the relay on and off.

Further, the auxiliary wiring platform includes a primary wiring part and a secondary wiring part, and the primary wiring part connects the large current conductive copper bars La, Lb, Lb1, Lb2, Lb4 and L1, L2, L3... L10 is connected to the terminals La, Lb, Lb1, Lb2, Lb4 and L1, L2, L3... L10 of the primary wiring panel of the auxiliary terminal block through the high current wire to facilitate the connection of the external terminals of the primary side of the current transformer under test. The secondary wiring part connects the normally open contacts K1, K2, K3... The wiring terminals on the secondary side of the current transformer under test.

Further, the current ratio of the two-stage current transformer is 5-5000A/5A and 5A/1A, and the accuracy level is 0.002. The two-stage current transformer is used as a standard for comparison with the tested current transformer with the same current ratio, and its accuracy is 2 accuracy levels higher than that of the tested current transformer.

Further, the current booster outputs a large current of 0-6000A, which is supplied to the two-stage current transformer and the primary side of the tested current transformer, forming a primary loop when the current transformer is verified;

Further, the control unit is used to control the opening and closing of all relays and contactors.

Further, the device also includes a temperature inspection instrument. The temperature inspection instrument monitors the temperature of the high-current conductor and the contact point in real time. The temperature of the 16 temperature control points is collected by the thermal resistance sensor. The value is transmitted to the host computer by RS232 communication to implement temperature monitoring and control.

Further, the relay state monitoring system tracks and monitors the opening and closing states of the relays that perform variable ratio switching, collects the switching quantities of the relays correspondingly in time, displays the corresponding states, and gives alarms for erroneous actions.

Further, the temperature and humidity environment monitoring system monitors the temperature and humidity of the environment where the device is located, collects the local environment temperature and humidity of the device in real time through the temperature and humidity sensor, and transmits it to the host computer through RS232 communication.

The automatic wiring equipment performs automatic wiring of the detected current transformers, two-stage current transformers and current boosters, specifically:

The automatic wiring equipment includes the primary and secondary automatic wiring of two-stage current transformers and the primary and secondary automatic wiring of the detected current transformers. The primary side terminals Lb, L2, L3...L8 of the dual-stage current transformer are connected to different conductive copper bars Lb, L2, L3...L8 through high-current wires, and the conductive copper bars Lb, L2, L3...L8 are connected to the relay. Open contact 1 and relay normally open contact 2 are connected to the COM terminal of the common conductive copper bar of the two-stage current transformer. Similarly, the primary side wiring of the detected current transformer is the same as the primary side wiring method of the two-stage current transformer. The primary side Lb, Lb1, Lb2, Lb4 and L2, L3...L10 are connected to the normally open contact 1 of the relay, and the normally open contact 2 is connected to the common conductive copper bar COM1 of the current transformer under test. The polarity terminals La and L1 on the primary side of the dual-stage current transformer are connected with the polar terminals La and L1 on the primary side of the detected current transformer through high-current wires, and the common terminals COM and COM1 are respectively connected to the output terminals of the current booster to form a primary loop , Control the on-off of the relay to realize the automatic wiring of the two-stage current transformer and the primary side of the detected current transformer. The two-stage current transformer and the secondary side of the tested current transformer are automatically connected to the same primary side wiring method. The common terminal com of the secondary side of the two-stage current transformer is led to the T0 terminal of the transformer calibrator, and the common terminal com1 of the secondary side of the tested current transformer is led to the Z terminal of the current load box, and is connected to the mutual inductance through the other end of the current load box. The Tx side of the calibrator can realize automatic wiring between the two-stage current transformer and the secondary side of the current transformer under test.

Further, the device workflow is as follows:

1) Connect the terminals La, Lb, L1, L2, L3...L10 on the primary side of the auxiliary terminal block to the primary side terminals La, Lb, L1, L2, L3...L10 of the tested current transformer through the high current wire , If there is no terminal on the primary side of the tested current transformer, the auxiliary terminal may not be drawn out. Connect the terminals K1, K2, K3… For the terminals that are not on the secondary side, the auxiliary terminal may not be led out;

2) The device inputs the relevant parameters of the current transformer under test;

3) The device automatically judges the opening and closing of all relays according to the transformation ratio;

The invention adopts the method of nameplate copying and bar code management to collect and manage the specification parameters and wiring information of the tested current transformers, and supports unified asset filing, error data query, storage, historical data comparison and the tested current transformers evaluation of the operating status of the device. The device is calibrated for current transformers with a current ratio of 5 to 5000A/5A and 1A and an accuracy level of 0.05 to 0.01. During the verification process, the current ratios of the two-stage current transformers are automatically switched, the primary wiring and secondary wiring of the tested current transformers are completed at one time, the current ratios are switched automatically, and the verification is completed automatically in sequence. Supports primary and secondary extended wiring of current transformers with any current ratio, as long as the current ratio of the standard device can be wired accordingly. In the division of labor, it is not necessary to correspond to the nameplate to check the transformation ratio. It is only necessary to correspond the primary terminal and the secondary terminal to the wiring panel of the wiring device, and the device will automatically switch the terminal according to the entered nameplate information. The control wiring device is completed, reducing the connection error rate and improving the test efficiency. In the automatic wiring equipment, the two-stage current transformer and the primary side automatic wiring part of the detected current transformer are connected by the primary side terminal of the transformer to the correspondingly marked conductive copper bar through the high current wire, and different conductive copper bars are connected to WJ32E- The normally open contact of the 12-type high-power export magnetic latching relay, the common terminal of the relay is connected to the common conductive copper bars COM and COM1 of the non-polar terminal on the primary side of the transformer. The WJ32E-12 high-power export magnetic latching relay used in the automatic wiring part of the two-stage current transformer and the primary side of the detected current transformer in the automatic wiring equipment has small contact resistance, stable resistance and strong consistency. Control, strong anti-interference ability, avoid malfunction in the test, and enhance the stability of the work. In the automatic wiring equipment, the conductive copper bar connecting the primary side terminal of the transformer and the normally open contact of the relay is made of high-quality tinned copper bar, which has large passing current and low impedance. Eddy current losses are reduced. The conductive copper bars in the automatic wiring equipment are fixed with phenolic resin insulating material, which insulates other metal materials, with high dielectric strength. The physical properties of the material can reduce the vibration and noise in the upflow. High-quality rubber and sound insulation cotton are used between the metal structural parts of the auxiliary terminal block and the automatic wiring equipment, which can effectively buffer the hard connection of the metal structural parts and copper bars, and can reduce and absorb vibration and noise. During the calibration, the primary wiring information and secondary wiring information and current ratio of the standard device and the tested current transformer are displayed in real time. Solve the problem that due to the wide range of standard transformation ratios and different grade requirements, in the actual verification, the wrong wiring will occur, and the work efficiency is low; It must be the same, and the connection of different transformation ratios may not be good, which will lead to an increase in the uncertainty of the deterioration of the same transformer under inspection, which may lead to problems such as qualified transformers being regarded as unqualified. Improve work efficiency and reduce the uncertainty of the measurement process.

One or more technical solutions provided by this application at least have the following technical effects or advantages:

The invention only needs to connect the primary terminal and the secondary terminal to the connection panel of the auxiliary terminal when calibrating the current transformer; the whole process of transformation ratio switching and automatic control is completed by the upper computer and the control wiring device; The standard device has a wide range of transformation ratios and different grade requirements. In the actual verification, the wrong wiring will occur, and the work efficiency is low; and in the process of verifying different transformation ratios of the same standard device, because each wiring operator is not necessarily the same. The connection of different ratios is not necessarily good, which will lead to the increase of uncertainty of the deterioration of the same transformer under test, which may lead to problems such as qualified transformers being regarded as unqualified, etc., which can improve work efficiency and reduce measurement. The technical effect of process uncertainty.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the embodiments of the present invention, and constitute a part of the present application, and do not constitute limitations to the embodiments of the present invention;

Fig. 1 is the structural block diagram of the automatic wiring device of the program-controlled current transformer according to the embodiment of the present invention;

Fig. 2 is the test principle diagram of the automatic wiring device of the program-controlled current transformer according to the embodiment of the present invention;

FIG. 3 is a primary wiring diagram of the automatic wiring device of the program-controlled current transformer according to the embodiment of the present invention.

Detailed ways

The invention provides an automatic wiring device for a program-controlled current transformer, which solves the technical problems of low wiring efficiency and error-prone in the prior art, and realizes the use of the device in the application to realize automatic wiring with high efficiency and accuracy. technical effect.

In order to understand the above objects, features and advantages of the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments may be combined with each other under the condition that they do not conflict with each other.

Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways that are different from the scope of this description. Therefore, the protection scope of the present invention is not subject to the following disclosure. The limitations of the specific embodiment.

The present application provides a fully automatic wiring device for a program-controlled current transformer, the device comprising:

Auxiliary terminal block, two-stage standard current transformer, current booster, automatic wiring equipment, control unit, tested current transformer, control unit and auxiliary terminal block, two-stage standard current transformer, current booster, automatic wiring The equipment and the current transformer under test are all connected, and the two-stage standard current transformer, current booster, automatic wiring equipment, the current transformer under test, the control unit and the auxiliary terminal are all connected; the automatic wiring equipment is connected to the current transformer under test. The primary side of the two-stage current transformer is connected in series with the primary side of the tested current transformer, and the control unit connects the secondary side of the two-stage current transformer with the current transformer. The secondary side signals of the tested current transformers are compared; the current booster is used to provide current; the control unit is used to control the relay on/off, the relay on/off status inspection, the current conductor and the contact point temperature change inspection in the device. Monitoring, temperature and humidity monitoring of the environment where the device is located.

Among them, the auxiliary terminal includes a primary wiring part and a secondary wiring part. The primary wiring part fixes the primary side of the current transformer under test and the primary side of the two-stage standard current transformer on different conductive copper bars with wires, respectively. In the secondary wiring part, the secondary side of the tested current transformer and the secondary side of the two-stage standard current transformer are connected to the corresponding terminals on the surface of the device.

As shown in Figures 1, 2, and 3, an automatic wiring device for a program-controlled current transformer includes a two-stage standard current transformer 101 connected to the tested current transformer, a current booster 102, and a primary wiring of the automatic wiring device. Parts 103, 104 and secondary wiring parts 105, 106, the standard 101 is connected in series with the primary side of the tested current transformer, and the secondary side signals of the two are compared, and the secondary side of the two-stage standard current transformer 101 is non-polar. The terminal is connected to the automatic wiring device To, the non-polar terminal of the tested current transformer is connected to the automatic wiring device Tx, the polar ends of the two are connected to the automatic wiring device K, and the B5 of the two-stage standard current transformer 101 is connected. To the automatic wiring device D, the control system software controls the opening and closing of the relays in the primary and secondary wiring parts.

Connect the primary side and secondary side of the tested current transformer and the two-stage standard current transformer 101 to the corresponding terminals of the automatic wiring device in turn, that is, the primary wiring parts 103, 104 and the secondary wiring parts 105, 106 . The current booster 102 is respectively connected with the primary side 103 of the two-stage standard current transformer 101 and the primary side 104 of the tested current transformer. The control system determines the number of turns of the current booster through the core and then controls the relay according to the transformation ratio of the tested current transformer. Opening and closing.

The test method is as follows:

1) Connect the two-stage current transformer, the current booster, the primary side and the secondary side of the detected current transformer to the device;

2) The device inputs the relevant parameters of the current transformer under test;

3) The device automatically judges the opening and closing of all relays according to the transformation ratio;

The invention adopts the method of nameplate copying and bar code management to collect and manage the specification parameters and wiring information of the tested current transformers, and supports unified asset filing, error data query, storage, historical data comparison and the tested current transformers evaluation of the operating status of the device. The device is calibrated for current transformers with a current ratio of 5 to 5000A/5A and 1A and an accuracy of 0.05 to 0.01. During the verification process, the primary and secondary wiring of each current ratio of the standard current transformer and the tested current transformer is completed at one time, and the verification of each current ratio sequence is automatically completed. Supports primary and secondary extended wiring of current transformers with any current ratio, as long as the current ratio of the standard device can be wired accordingly. In the division of labor, it is not necessary to correspond to the nameplate to check the transformation ratio. It is only necessary to correspond the primary terminal and the secondary terminal to the wiring panel of the wiring device, and the device will automatically switch the terminal according to the entered nameplate information. The control wiring device is completed, reducing the connection error rate and improving the test efficiency. The primary switching module and secondary switching module of the device all use high-power export-type magnetic latching relays, with small contact impedance, stable resistance value, strong consistency, pulse control, strong anti-interference ability, avoiding malfunction during testing, enhancing work stability. Using high-quality tin-plated copper, the passing current is large and the impedance is small. The geometric size of the copper material greatly avoids the current skin effect and reduces the eddy current loss. Using phenolic resin insulation material, the insulation strength is high, and the physical properties of the material can reduce the vibration and noise in the upflow. The use of high-quality rubber and sound insulation cotton effectively cushions the metal parts and the hard connection of the bronze medal, which can reduce and absorb vibration and noise. During the calibration, the primary wiring information and secondary wiring information and current ratio of the standard device and the tested current transformer are displayed in real time. Solve the problem that due to the wide range of standard transformation ratios and different grade requirements, in the actual verification, the wrong wiring will occur, and the work efficiency is low; It must be the same, and the connection of different transformation ratios may not be good, which will lead to an increase in the uncertainty of the deterioration of the same transformer under inspection, which may lead to problems such as qualified transformers being regarded as unqualified. Improve work efficiency and reduce the uncertainty of the measurement process.

One or more technical solutions provided by this application at least have the following technical effects or advantages:

The invention only needs to connect the primary terminal and the secondary terminal to the connection panel of the auxiliary terminal when calibrating the current transformer; the whole process of transformation ratio switching and automatic control is completed by the upper computer and the control wiring device; The standard device has a wide range of transformation ratios and different grade requirements. In the actual verification, the wrong wiring will occur, and the work efficiency is low; and in the process of verifying different transformation ratios of the same standard device, because each wiring operator is not necessarily the same. The connection of different ratios is not necessarily good, which will lead to the increase of uncertainty of the deterioration of the same transformer under test, which may lead to problems such as qualified transformers being regarded as unqualified, etc., which can improve work efficiency and reduce measurement. The technical effect of process uncertainty.

Although preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (7)

1. a program-controlled current transformer automatic wiring device, is characterized in that, described device comprises: Auxiliary terminal block, standard two-stage current transformer, current booster, automatic wiring equipment, control unit, tested current transformer, control unit and auxiliary terminal block, standard two-stage current transformer, current booster, automatic wiring The equipment and the current transformer under test are all connected, and the standard two-stage current transformer, current booster, automatic wiring equipment, the current transformer under test, the control unit and the auxiliary terminal are all connected; the automatic wiring equipment is connected to the current transformer under test. The primary side of the standard two-stage current transformer is connected in series with the primary side of the tested current transformer, and the control unit connects the secondary side of the standard two-stage current transformer The side of the current transformer is compared with the secondary side signal of the tested current transformer; the current booster is used to provide current; the control unit is used to control the relay on/off, relay on/off status inspection, current conductor and contact point temperature in the device Change inspection, temperature and humidity monitoring of the environment where the device is located; The fully automatic wiring equipment performs automatic wiring on the current transformer under test, the standard two-stage current transformer and the current booster, specifically: The automatic wiring includes: the primary and secondary automatic wiring of the standard two-stage current transformer and the primary and secondary automatic wiring of the tested current transformer; the primary side terminals Lb, L2, L3...L8 of the standard two-stage current transformer are connected to the conductive wires respectively Copper bars Lb, L2, L3...L8, conductive copper bars Lb, L2, L3...L8 are connected to relay normally open contact 1, relay normally open contact 2 is connected to the standard two-stage current transformer common conductive copper bar COM terminal, The primary side Lb, Lb1, Lb2, Lb4 and L2, L3... L10 of the current transformer under test is connected to the normally open contact 1 of the relay, and the normally open contact 2 is connected to the common conductive copper bar COM1 of the current transformer under test; standard two-stage current The polarity terminals La and L1 on the primary side of the transformer are connected with the polar terminals La and L1 on the primary side of the detected current transformer through wires. The automatic wiring of the primary side of the standard two-stage current transformer and the tested current transformer is realized; the automatic wiring method of the secondary side of the standard two-stage current transformer and the tested current transformer is the same as that of the primary side; the standard two-stage current transformer The common terminal com of the secondary side of the current transformer is led to the T0 terminal of the transformer calibrator, and the common terminal com1 of the secondary side of the tested current transformer is led to the Z terminal of the current load box, and is connected to the transformer calibrator through the other end of the current load box. The Tx terminal realizes automatic wiring between the standard two-stage current transformer and the secondary side of the tested current transformer. 2. The fully automatic wiring device for program-controlled current transformer according to claim 1, wherein the auxiliary terminal comprises: a primary wiring part, a secondary wiring part, and the primary wiring part connects the primary side of the tested current transformer and the secondary wiring part. The primary side of the standard two-stage current transformer is fixed on different conductive copper bars with wires, and the secondary wiring part connects the secondary side of the tested current transformer and the secondary side of the standard two-stage current transformer to the surface of the device on the corresponding terminal. 3 . The automatic connection device for program-controlled current transformers according to claim 1 , wherein the transformation ratio of the standard two-stage current transformers is 5-5000A/5A and 5A/1A, and the accuracy level is 0.002. 4 . 4 . The fully automatic wiring device for a program-controlled current transformer according to claim 1 , wherein the current booster outputs a current of 0 to 6000A to supply the primary side of a standard two-stage current transformer. 5 . 5. The fully automatic wiring device of the program-controlled current transformer according to claim 1, wherein the control unit is used for real-time monitoring of the temperature of the current conductor and the contact point, and collects 16 temperature-controllers through a thermal resistance sensor The temperature of the point, the 16-channel temperature value is transmitted to the upper computer through the RS232 communication through the temperature inspection instrument to implement temperature monitoring and control. 6 . The fully automatic wiring device for program-controlled current transformers according to claim 1 , wherein the control unit is used to track and monitor the opening and closing states of the relays that perform variable ratio switching, and to timely monitor the relays that act accordingly. 7 . The switching value is collected, the corresponding status is displayed, and an alarm prompt is given for the wrong action. 7. The fully automatic wiring device for a program-controlled current transformer according to claim 1, wherein the control unit is used for monitoring the temperature and humidity of the environment where the device is located, and collects the local ambient temperature at that time in real time through a temperature and humidity sensor. The humidity is transmitted to the host computer through RS232 communication.

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