CN213876425U - Circuit of external electronic CT (computed tomography) check motor comprehensive protection device for high-temperature gas cooled reactor - Google Patents

Abstract

The utility model provides a circuit of a high temperature gas cooled reactor using an external electronic CT (computed tomography) check motor comprehensive protection device, which uses a three-phase relay protection calibrator as a test power supply, uses a test line as a loop and is not connected with other equipment; the three-phase relay protection calibrator, an external electronic current transformer, a motor comprehensive protection device and a contactor are also included; the external electronic current transformer is of a straight-through structure, and a test wire penetrates through a middle round hole of the external electronic current transformer and is repeatedly wound for multiple circles; the external electronic current transformer is connected with the motor comprehensive protection device through a secondary lead; and the contactor is respectively connected with the three-phase relay protection calibrator and the motor comprehensive protection device. The circuit structure reduces the equipment damage risk, solves the problem of asynchronous current introduction and timing, enhances the personal safety of workers, and reduces the difficulty of test work and the investment of test expenses.

Description

Circuit of external electronic CT (computed tomography) check motor comprehensive protection device for high-temperature gas cooled reactor

Technical Field

The utility model relates to a circuit structure especially relates to a high temperature gas cooled reactor uses external electronic type CT to simulate fault current's circuit with comprehensive protection device of motor.

Background

The motor protection controller is an intelligent motor protector developed for fault diagnosis of a low-voltage motor in various application occasions. The multifunctional electric water heater has the characteristics of small volume, light weight, strong functions, high reliability, flexible configuration, attractive appearance, convenience in installation and the like. The high-speed processor of high integration system is adopted to collect and process data, and the functions of measurement and control, metering, operation recording and communication are integrated on the basis of realizing the protection of the traditional low-voltage motor, so that the digitization, the intellectualization and the networking are really realized, the protection and the measurement and control are integrated, and great convenience is brought to the management of industrial production process control.

The high-temperature gas cooled reactor selects the motor protection controller as a control and protection element of the plant motor, saves a large amount of manpower and material resources in the daily operation and running process, and is convenient for operators to control. However, the motor protection controller is placed in the electrical drawer switch, and the arrangement in the drawer switch is very compact, which brings much inconvenience to protection and verification during debugging.

The current calibration method commonly used in the industry is to draw out a drawer switch, add a working power current (the current flows through a loop as shown in (c) → (c) → to (c)) directly at a position of a primary contact, simulate a fault for calibration, input a secondary measurement current to a motor comprehensive protection device through a loop (b), and output a trip command through a loop (r) to trip off a contactor if the motor comprehensive protection device judges that the loop has a fault through internal logic operation, as shown in fig. 1, but the method has the following disadvantages: 1. the power current is too large, and the damage risk of the equipment is increased. Particularly, the contactor does not have the capacity of breaking short-circuit current, once the applied current is too large, the contact is easy to be adhered or fused once in the arc quenching process, and irrecoverable damage is caused to the contactor; 2. the current is not synchronized with the timing, so that the measurement of the protection action time has deviation, and the test result exceeds the allowable range; 3. the conductor is exposed, so that great hidden danger exists for the personal safety of surrounding workers in the process of increasing the current; 4. the secondary circuit (R) in the figure) of the electronic current transformer does not adopt the wiring form of the secondary terminal strip of the traditional current transformer, but is concentrated in a secondary plug, thereby being convenient for personnel to operate and simultaneously avoiding the possibility of wrong wiring, but the current can not be directly added in the secondary circuit unless a special motor protection tester is purchased, thereby increasing the difficulty of the test work and the investment of the test expenditure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: the external electronic CT is used for simulating fault current, so that the calibration process of the comprehensive protection device for the service motor is simplified.

The technical scheme is as follows:

the high-temperature gas cooled reactor uses a circuit of an external electronic CT (computed tomography) check motor comprehensive protection device, uses a three-phase relay protection check meter as a test power supply, uses a test line as a loop, and is not connected with other equipment; it is characterized in that: the three-phase relay protection calibrator, an external electronic current transformer, a motor comprehensive protection device and a contactor are also included; the external electronic current transformer is of a straight-through structure, and a test wire penetrates through a middle round hole of the external electronic current transformer and is repeatedly wound for multiple circles; the external electronic current transformer is connected with the motor comprehensive protection device through a secondary lead; and the contactor is respectively connected with the three-phase relay protection calibrator and the motor comprehensive protection device. Preferably: the three-phase relay protection calibrator comprises current output ports IA, IB and IC and a current input end IN; the current output terminals IA and IN, IB and IN, and IC and IN are connected by wires to form a current loop.

Preferably: and the lead penetrating through the external electronic current transformer needs to be wound repeatedly.

Preferably: and a current output line of the external electronic current transformer is connected to a current input port of the motor comprehensive protection device.

Preferably: and the protection action contact of the motor comprehensive protection device is output to a brake-separating control loop for controlling the contactor.

Preferably: and an action contact of the contactor is connected to the input end of the three-phase relay protection calibrator.

Preferably: the three-phase relay protection calibrator is used as a current source, test power current is output from a current output end, and the current is measured by the external electronic current transformer.

Has the advantages that:

1. reducing the risk of equipment damage; 2. the problem of asynchronous current introduction and timing is solved; 3. the personal safety of workers is enhanced; 4. the difficulty of test work and the investment of test expenses are reduced.

Drawings

Fig. 1 is a circuit structure of a matched electronic CT checking motor comprehensive protection device in the prior art.

Fig. 2 is a circuit structure of the utility model using an external electronic CT calibration motor comprehensive protection device.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention/utility model will be described in further detail with reference to the accompanying drawings and the detailed description.

The secondary input of the motor comprehensive protection device for the high-temperature reactor plant adopts electronic CT, so that a general relay protection calibrator cannot be used for directly simulating faults, and the function can be realized only by purchasing special calibration equipment. If directly let in a current in a return circuit, then have great threat to personnel, equipment safety in the experimentation, consequently adopt the utility model discloses the technical scheme who records.

The high-temperature gas cooled reactor uses a circuit structure of an external electronic CT (computed tomography) check motor comprehensive protection device, uses a three-phase relay protection check meter as a test power supply, uses a test line as a loop, and is not connected with other equipment; it is characterized in that: the three-phase relay protection calibrator, an external electronic current transformer, a motor comprehensive protection device and a contactor are also included; the external electronic current transformer is of a straight-through structure, and a test wire penetrates through a middle round hole of the external electronic current transformer and is repeatedly wound for multiple circles; the external electronic current transformer is connected with the motor comprehensive protection device through a secondary lead; and the contactor is respectively connected with the three-phase relay protection calibrator and the motor comprehensive protection device. The connection relationship between the above-mentioned respective functional components is further described as follows:

a) a test wire is IN short circuit with current output ends IA and IN, IB and IN, and IC and IN of the three-phase relay protection calibrator to form a loop;

b) removing the wiring from the output end of the matched electronic current transformer to the input end of the motor comprehensive protection device, namely removing a loop ((R)) in the drawing;

c) the test wire penetrates through the external electronic current transformer and is wound repeatedly, and the current in the test wire is measured by utilizing the electromagnetic induction principle;

d) connecting a current output line of an external electronic current transformer to a current input port (as a loop in the figure, c) of the motor comprehensive protection device;

e) the protection action contact of the motor comprehensive protection device is output to a brake separating control loop of the contactor and is used for tripping the contactor (such as a loop (R) in the figure);

f) the action contact of the contactor is output to the input end of the open amount of the three-phase relay protection calibrator (as shown by a loop 9O in the figure);

g) the three-phase relay protection calibrator serves as a power supply and outputs test power current from a current output end

(loop [ () - ] in the figure → loop [ (- ]).

The working process and the working principle of the circuit structure of the external electronic CT verification motor comprehensive protection device used by the high-temperature gas cooled reactor are as follows:

step 1: control electricity is introduced into the contactor, the motor comprehensive protection device and the three-phase relay protection calibrator;

step 2: setting a three-phase relay protection calibrator, circulating a fault current simulated by constant value single output in a test line, and starting timing by the three-phase relay protection calibrator while outputting the current;

and step 3: an external electronic current transformer measures the current in the test wire, converts the current into small current and outputs the small current to the current input end of the motor comprehensive protection device;

and 4, step 4: the motor comprehensive protection device analyzes input current and judges whether the outside has a fault according to internal logic, and if the external fault is judged, a tripping command is output to a separating brake control loop of the contactor to trip the contactor;

and 5: when the contactor is tripped, an action contact is closed, and the action contact is output to an input quantity input end of the three-phase relay protection calibrator for stopping timing;

step 6: the action current and the action time are recorded and compared with the values on the fixed value sheet.

The circuit structure of the external electronic CT verification motor comprehensive protection device for the high-temperature gas cooled reactor can achieve the following beneficial effects: 1. by using the external CT, the problem of narrow space caused by compact layout of drawers is solved, and a tester can complete wiring work more easily; 2. the primary wiring is wound for multiple times, so that the primary current value can be effectively reduced, the equipment damage risk is reduced, and the safety of workers is protected; 3. the primary current is small, a special power supply is not needed, related matched equipment is reduced, and the test budget is reduced; 4. the three-phase relay protection calibrator is used as a primary power supply, and the current is output through a program in the tester while the time is counted, so that the accuracy of the time counting is ensured; 5. the current does not pass through the contactor in the test process, so that the possibility that the contactor is damaged due to the fact that the current is cut off once is avoided; 6. the test can be completed by using the universal three-phase relay protection calibrator without purchasing special calibration equipment, so that the test expense is saved.

It is to be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention/utility model, but the present invention/utility model is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention/utility model, and these modifications and improvements are also considered to be within the scope of the invention/utility model.

Claims (7)

1. The high-temperature gas cooled reactor uses a circuit of an external electronic CT (computed tomography) check motor comprehensive protection device, uses a three-phase relay protection check meter as a test power supply, uses a test line as a loop, and is not connected with other equipment; it is characterized in that: the three-phase relay protection calibrator, an external electronic current transformer, a motor comprehensive protection device and a contactor are also included; the external electronic current transformer is of a straight-through structure, and a test wire penetrates through a middle round hole of the external electronic current transformer and is repeatedly wound for multiple circles; the external electronic current transformer is connected with the motor comprehensive protection device through a secondary lead; and the contactor is respectively connected with the three-phase relay protection calibrator and the motor comprehensive protection device.

2. The circuit of the high temperature gas cooled reactor using the external electronic CT verification motor comprehensive protection device according to claim 1, characterized in that: the three-phase relay protection calibrator comprises current output ports IA, IB and IC and a current input end IN; the current output terminals IA and IN, IB and IN, and IC and IN are connected by wires to form a current loop.

3. The circuit of the high temperature gas cooled reactor using the external electronic CT verification motor comprehensive protection device according to claim 1, characterized in that: and the lead penetrating through the external electronic current transformer needs to be wound repeatedly.

4. The circuit of the high temperature gas cooled reactor using the external electronic CT verification motor comprehensive protection device according to claim 1, characterized in that: and a current output line of the external electronic current transformer is connected to a current input port of the motor comprehensive protection device.

5. The circuit of the high temperature gas cooled reactor using the external electronic CT verification motor comprehensive protection device according to claim 1, characterized in that: and the protection action contact of the motor comprehensive protection device is output to a brake-separating control loop for controlling the contactor.

6. The circuit of the high temperature gas cooled reactor using the external electronic CT verification motor comprehensive protection device according to claim 1, characterized in that: and an action contact of the contactor is connected to the input end of the three-phase relay protection calibrator.

7. The circuit of the high temperature gas cooled reactor using the external electronic CT verification motor comprehensive protection device according to claim 1, characterized in that: the three-phase relay protection calibrator is used as a current source, test power current is output from a current output end, and the current is measured by the external electronic current transformer.

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