CN204009039U - A kind of current transformer error curve auxiliary testing system - Google Patents

Abstract

The utility model relates to a current transformer error curve auxiliary test system, the current transformer error curve auxiliary test system includes: an input channel, a channel switching module, a switch, a manual button, an LED lamp, and a pulse signal receiving end; therefore, the utility model Newly set input channels, channel switching modules, switching switches, manual buttons, LED lights, and pulse signal receiving terminals; all the current loops of all groups in the interval are connected to the system, and then all tests are automatically completed through logic control, thereby improving test efficiency. . The utility model is suitable for on-site tests, and has no influence on the collection accuracy of the current transformer error curve tester; the manual line change operation is changed into automatic logic control, the possibility of human error operation is reduced, and the safety is improved; all lines are connected at one time , to avoid manpower to change the wiring mode, one person can complete the whole test, saving manpower and improving efficiency.

Description

A Current Transformer Error Curve Auxiliary Test System

technical field

The utility model belongs to the technical field of current transformer error testing, in particular to an auxiliary testing system for current transformer error curves.

Background technique

At present, the volt-ampere characteristic of a current transformer (CT) is an important item in the performance test of a current transformer (CT). The relationship curve of the voltage applied to the secondary side of the current transformer. The error curve of the current transformer (CT) is based on the volt-ampere characteristics of the current transformer (CT), which is a further verification of the accuracy of the current transformer (CT), and is also an important key point Basic characteristics, the relay protection device reflects the fault state of the primary system. When a system fault occurs and the protection device operates, the primary current of the current transformer is usually much larger than the current during operation, so the error of the current transformer will also expand. In order for the protection device to correctly respond to the primary system conditions and operate correctly, the transformation ratio error of the current transformer is required to be less than the specified upper limit.

Usually, the current transformer (CT) error curve test is completed on site, and the current transformer (CT) error curve tester is used to connect the current transformer (CT) secondary side terminal to collect data, and then through the current transformer (CT) The error curve tester automatically draws the error curve after calculation to determine whether the current transformer (CT) installed on site meets the error standard. One phase of a group of CTs is acquired at a time. The primary winding of the current transformer (CT) is connected to the power grid in series, and the secondary winding is led out from the S terminal and then connected to the secondary terminal block. Each phase current transformer (CT) generally has more than two sets of secondary winding coils , respectively forming multiple sets of three-phase current loops (A, B, C, N) on the terminal block. Usually, there are four sets of current loops in the secondary side terminal block in each interval. In the process of using the current transformer (CT) error curve tester on site, only one phase (A, N) of a group of currents can be tested at a time. This work requires the cooperation of two people, and one person operates the current transformer. The CT error curve tester, another person stands in the interval to change the line and change the phase, and change the next phase after each phase is tested, so the efficiency of the test is relatively low.

Utility model content

The utility model provides a current transformer error curve auxiliary test system with simple structure, convenient installation and use, and improved work efficiency to solve the problems of manual operation and low work efficiency in the error curve test of the current transformer.

The technical scheme that the utility model takes for solving the technical problem existing in the known technology is:

The current transformer error curve auxiliary test system according to the embodiment of the utility model, the current transformer error curve auxiliary test system includes: an input channel, a channel switching module, a switch, a manual button, an LED light, and a pulse signal receiving end;

Used to connect the input channel of the output of the secondary winding of the current transformer, connected with the input channel to control the channel switching module for channel switching, connected with the channel switching module for selecting the manual/automatic operation switch, and the switching switch and channel switching The module is connected to the manual button for manual control of channel switching, connected to the channel switching module to display the LED light of the channel status, connected to the switch and channel switching module to receive the pulse signal receiving of the pulse signal of the current transformer error curve tester end.

The utility model can also adopt the following technical measures:

In the embodiment of the utility model, the input channels include 12 channels, and 3 channels form a group, and each group corresponds to the A pole, B pole and C pole of the four groups of current loops in the secondary side terminal row of the current transformer.

Further, the LED light includes 12 status LEDs, which correspond to the 12 channels of the input channels respectively.

The advantages and positive effects of the utility model are: because the utility model is provided with an input channel, a channel switching module, a switch, a manual button, an LED light, and a pulse signal receiving end; all the current loops of all groups in the interval are connected to the system , and then automatically complete all tests through logic control. The utility model is suitable for on-site tests, and has no influence on the collection accuracy of the current transformer error curve tester; it changes the man-made line change operation into automatic logic control, reduces the possibility of man-made misoperation, and also reduces the gap between the test personnel and the live equipment. The frequent contact improves the work safety to a certain extent; the test wiring of all the tested groups of CTs in the panel is connected at one time. In the past, the method of replacing the test wiring for each group of CTs tested separately was adopted. Compared with It saves time for repeated operations and greatly improves work efficiency; instead of the previous working mode of two people working together (one person changes the line in the panel and one person controls the tester), use this set of current transformer error curves to assist in testing The system conducts the test, and one person can complete the whole test (after connecting all the test lines, start the auxiliary test system, and all tests will be automatically completed according to the logic), which saves the manpower required for this test work.

Description of drawings

Fig. 1 is a schematic structural diagram of the current transformer error curve auxiliary test system provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the internal structure of the current transformer error curve auxiliary test system provided by the embodiment of the present invention;

In the figure: 1. Input channel; 2. Channel switching module; 3. Switching switch; 4. Manual button; 5. LED light; 6. Pulse signal receiving end.

Detailed ways

In order to further understand the content of the invention, features and effects of the present utility model, the following embodiments are cited hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings: the software modules or units used in the present utility model all belong to known modules or units, and are When a hardware module or unit is installed, the software is already installed. There is no software or method innovation in the utility model.

Please refer to Figure 1 and Figure 2:

As shown in Figure 1, the current transformer error curve auxiliary test system of the embodiment of the utility model is mainly composed of: input channel 1, channel switching module 2, switch switch 3, manual button 4, LED light 5, pulse signal receiving end 6 ;

Input channel 1 for connecting the output of the secondary winding of the current transformer, connected with input channel 1 for channel switching module 2 for controlling channel switching, connected with channel switching module 2 for switching switch 3 for selecting manual/automatic operation, and The switch 3 and the channel switching module 2 are connected to the manual button 4 for manually controlling channel switching, the channel switching module 2 is connected to the LED 5 for displaying the channel status, and the switching switch 3 and the channel switching module 2 are connected to receive the current transformer The pulse signal receiving end 6 of the pulse signal of the error curve tester;

In the embodiment of the utility model, the input channels include 12 channels, and 3 channels form a group, and each group corresponds to the A pole, B pole and C pole of the four groups of current loops in the CT secondary side terminal row.

The channel switching module is connected with the switch of manual/automatic operation. When the switching switch is in the automatic mode, the channel switching module can automatically switch to the next channel after the CT error curve tester completes a phase channel test; when the When the switching switch is in manual mode, the channel switching module is under the action of the manual button, and each time the manual button is pressed, the channel is switched to the next channel.

The LED light contains 12 status LEDs, which correspond to the 12 channels of the input channel. When the channel is selected, the corresponding LED lights up.

Embodiment of the present utility model:

In Figure 1, there are four groups of current loops in the CT secondary side terminal row. The N poles of each group are short-circuited and then connected to the N pole of the CT error curve tester; the A, B, and C of each group are respectively connected to the system In the 1 to 12 channels in the system, a pole A is drawn from the system to connect to the pole A of the CT error curve tester; in the system, the switch is turned to the manual position, and each time the button is pressed, the channel switches to the next one, and the corresponding The LED light of the channel will be on; turn the switch to the automatic position, and the channel switching will be automatically controlled by the pulse signal. The pulse signal is sent by a pair of nodes l and n of the CT error curve tester. Set the CT error curve tester to complete a phase channel After the test, send a pulse signal.

The specific operation process is to connect all the external lines, turn the switch to the automatic position, the system initially defaults to channel 1, and control the CT error curve tester to start the test. After the test, the CT error curve tester automatically sends out a pulse signal. , In the n-node control system, switch channel 1 to channel 2, and then carry out the test; if the test needs to be repeated, turn the switch to the manual position, and use the button to manually switch the channel to the channel to be tested.

In Figure 2, turn the switch to the automatic or manual position, and the corresponding function will be realized; the channel switching module adopts the MT8808 model, this model module is self-contained battery, with its own LED channel indicator light, through manual button or automatic pulse All signals can be switched; the A pole corresponds to the A pole output of the CT error curve tester, and the 12 switching channels correspond to the A, B, and C pole inputs of the four sets of current loops in the CT secondary side terminal block.

The utility model changes human operation into automatic logic operation, reduces human errors, and is safer and more reliable. The work that originally required two people is simplified to one person's operation, the on-site wiring is simple, the operation process is simplified, and the test efficiency is greatly improved.

The utility model is suitable for on-site tests, and has no influence on the collection accuracy of the current transformer error curve tester; it changes the man-made line change operation into automatic logic control, reduces the possibility of man-made misoperation, and also reduces the gap between the test personnel and the live equipment. The frequent contact improves the work safety to a certain extent; the test wiring of all the tested groups of CTs in the panel is connected at one time. In the past, the method of replacing the test wiring for each group of CTs tested separately was adopted. Compared with It saves the time of repeated operations and greatly improves the work efficiency; instead of the previous working mode of two people working together (one person changes the line in the panel and one person controls the tester), use this set of current transformer error curve to assist the test The system conducts the test, and one person can complete the entire test (after connecting all the test lines, start the auxiliary test system, and all tests will be automatically completed according to the logic), which saves the manpower required for this test work.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Any simple modifications made to the above embodiments according to the technical essence of the present utility model are equivalent to changes and modifications. All belong to the scope of the technical solution of the utility model.

Claims (3)

1. A current transformer error curve auxiliary test system is characterized in that the current transformer error curve auxiliary test system includes: input channel, channel switching module, switch, manual button, LED light, pulse signal receiving end; Used to connect the input channel of the output of the secondary winding of the current transformer, connected with the input channel to control the channel switching module for channel switching, connected with the channel switching module for selecting the manual/automatic operation switch, and the switching switch and channel switching The module is connected to the manual button for manual control of channel switching, connected to the channel switching module to display the LED light of the channel status, connected to the switch and channel switching module to receive the pulse signal receiving of the pulse signal of the current transformer error curve tester end. 2. the current transformer error curve auxiliary testing system as claimed in claim 1, is characterized in that, input channel comprises 12 channels, and 3 channels are 1 group, and each group corresponds to four in the secondary side terminal row of current transformer respectively. The A pole, B pole and C pole of the group current loop. 3. The current transformer error curve auxiliary testing system as claimed in claim 1, wherein the LED light comprises 12 status LEDs corresponding to the 12 input channels respectively.