CN204440773U - Three grades of aftercurrent action protecting simulation training systems - Google Patents

Abstract

The utility model discloses a three-level residual current action protection simulation training system, which includes a three-phase four-wire control voltage source, the three-phase four-wire control voltage source is connected with a main line, and the main line is divided into two branch lines; The main line is connected with the ammeter of each phase and the universal transfer switch in sequence, and the output end of the universal transfer switch is connected with a first-level residual current action protection module, which includes a residual current protector and a current transformer. Reactive power compensation controller; a secondary residual current action protection module and a first fault simulation module are set on the first trunk line, and a third level residual current action protection module and a second fault simulation module are set on the second trunk line. The utility model simulates the operation mode of the entire substation area, covers multiple residual current protection points such as main lines and branch lines, and can realize residual current protection faults in low-voltage power grid operation scenarios.

Description

Three-level residual current operating protection simulation training system

technical field

The utility model belongs to the field of low-voltage power distribution, in particular to a three-level residual current action protection simulation training system.

Background technique

Since the residual current action protection system is put into operation, the safe operation of the distribution network system is reliably guaranteed, and the damage of power supply and consumption equipment and the occurrence of personal casualties are largely avoided. Therefore, the residual current action protection system is widely used. application.

However, some power supply units have irregular operation and management of protectors and improper use by users, resulting in serious phenomena such as refusal, malfunction, and tripping of residual current protectors. , The residual current protector did not trip in time, etc. With the improvement of people's living conditions and the advancement of the policy of sending home appliances to the countryside, various household appliances have entered the homes of ordinary people, but the interference generated by the opening of household appliances such as frequency conversion air conditioners will cause the residual current protector to malfunction, affecting The normal electricity consumption of residents. How to correctly and quickly judge the reason for the tripping of the residual current protector and improve the electrician's on-site problem-solving skills is an urgent need for the safe operation of the power grid.

The most common fault in the low-voltage power distribution network is the insulation reduction of the low-voltage circuit or electrical equipment due to some reasons. The insulation reduction of the circuit or electrical equipment not only affects normal operation but also brings certain safety hazards. In order to ensure For the safe operation of the low-voltage power distribution network, a three-level residual leakage protection system is usually installed in each distribution transformer area. The three-level residual current protection system is put into operation, which largely avoids damage to power supply and consumption equipment. The occurrence of personal injury and death accidents has ensured the safe operation of the power distribution network. However, with the widespread application of the three-level residual current protection system, some power supply units have irregular management of the protector operation and improper use by users, resulting in failures such as refusal, malfunction, and over-level tripping of the residual current protector. , Seriously affecting the normal production and domestic electricity consumption of users. How to accurately determine the reason for the tripping of the residual current protector, quickly restore the power supply, and improve the professional skills of the electrician to solve the problem on site are very important to ensure the safe operation of the power grid.

Utility model content

The purpose of the utility model is to provide a three-level residual current action protection simulation training system capable of simulating a residual current protection fault in a low-voltage power grid operation scene.

The technical solution to realize the purpose of this utility model is: a three-level residual current action protection simulation training system, including a three-phase four-wire control voltage source, the three-phase four-wire control voltage source is connected to a main line, the main line There are two branch lines;

The main line is connected with the ammeter of each phase and the universal transfer switch in sequence, and the output end of the universal transfer switch is connected with a first-level residual current action protection module, and the first-level residual current action protection module includes a residual current protector and a current transformer. There is also a reactive power compensation controller;

A secondary residual current action protection module and a first fault simulation module are arranged on the first trunk line, and a third level residual current action protection module and a second fault simulation module are arranged on the second trunk line.

Compared with the prior art, the utility model has the remarkable advantages as follows: (1) The utility model realizes the residual current action through the first-level residual current action protection module, the second-level residual current action protection module and the third-level residual current action protection module A comprehensive practical training system including protection system installation, parameter setting, residual current fault setting, etc.; (2) The utility model simulates the operation mode of the entire substation area, covering multiple residual currents such as main lines and branch lines The protection point can realize the residual current protection fault in the scene of low-voltage power grid operation; (3) The utility model overcomes many disadvantages such as on-site training affecting low-voltage power distribution operation, unsafe factors, and being limited by distance.

Description of drawings

Fig. 1 is a structural block diagram of the three-stage residual current action protection simulation training system of the present invention.

Fig. 2 is a schematic circuit diagram of a simulation training system for three-stage residual current action protection according to an embodiment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Combined with Figure 1, a three-level residual current action protection simulation training system includes a three-phase four-wire controlled voltage source, the three-phase four-wire controlled voltage source is connected to a main line, and the main line is divided into two branch lines ;

Combined with Figure 2, the main line is connected with the ammeter of each phase and the universal transfer switch in sequence, and the output end of the universal transfer switch is connected with a first-level residual current action protection module, and the first-level residual current action protection module includes a residual current protector and a current transformer. , a reactive power compensation controller is also set on the main line;

A secondary residual current action protection module and a first fault simulation module are arranged on the first trunk line, and a third level residual current action protection module and a second fault simulation module are arranged on the second trunk line.

The secondary residual current operating protection module includes a first residual current operating circuit breaker and a second residual current operating circuit breaker, and the first residual current operating circuit breaker and the second residual current operating circuit breaker are both connected to the first branch line ; The first fault simulation module includes a first impedance unit and a first switch; one end of the first switch is connected to the first branch line, the other end is connected to the first impedance unit, and the first impedance unit is grounded.

The three-level residual current operating protection module includes a third residual current operating circuit breaker, a fourth residual current operating circuit breaker and a fifth residual current operating circuit breaker, and the above three residual current operating circuit breakers are all connected to the second trunk line; The second fault simulation module includes a second impedance unit and a second switch, one end of the second switch is connected to the second trunk line, the other end is connected to the second impedance unit, and the second impedance unit is grounded.

Both the first fault simulation module and the second fault simulation module are connected to the background computer.

A voltage display unit is also arranged on the main line.

The model of the residual current protector is JD6-6, the current transformer is a zero-sequence current transformer, and the model of the reactive power compensation controller is JKWD5.

The models of the first to fifth residual current operated circuit breakers are QLL1-1000Z.

Below in conjunction with specific embodiment the utility model is described further.

Example 1

Combined with Figure 1, a three-level residual current action protection simulation training system includes a three-phase four-wire controlled voltage source, the three-phase four-wire controlled voltage source is connected to a main line, and the main line is divided into two branch lines ;

The main line is connected with ammeters, voltmeters and universal transfer switches of each phase in sequence, and the output end of the universal transfer switch is connected with a first-level residual current action protection module. The first-level residual current action protection module includes a residual current protector and a current transformer. There is also a reactive power compensation controller on the main line; among them, the model of the residual current protector is JD6-6, the current transformer is a zero-sequence current transformer, and the model of the reactive power compensation controller is JKWD5.

A secondary residual current action protection module and a first fault simulation module are arranged on the first trunk line, and a third level residual current action protection module and a second fault simulation module are arranged on the second trunk line.

The secondary residual current operating protection module includes a first residual current operating circuit breaker and a second residual current operating circuit breaker, and the first residual current operating circuit breaker and the second residual current operating circuit breaker are both connected to the first branch line; The first fault simulation module includes a first impedance unit and a first switch; one end of the first switch is connected to the first trunk line, the other end is connected to the first impedance unit, and the first impedance unit is grounded.

The three-stage residual current operated protection module includes a third residual current operated circuit breaker, a fourth residual current operated circuit breaker and a fifth residual current operated circuit breaker, and the above three residual current operated circuit breakers are all connected to the second trunk line; The second fault simulation module includes a second impedance unit and a second switch, one end of the second switch is connected to the second trunk line, the other end is connected to the second impedance unit, and the second impedance unit is grounded; the first to fifth residual current operated circuit breakers The model number is QLL1-1000Z.

Both the first fault simulation module and the second fault simulation module are connected with the background computer.

This embodiment simulates the operation mode of the entire substation area, covering multiple residual current protection points such as main lines and branch lines, and can realize residual current protection faults in low-voltage grid operation scenarios.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (7)

1. A three-level residual current action protection simulation training system, characterized in that it includes a three-phase four-wire controlled voltage source, the three-phase four-wire controlled voltage source is connected with a main line, and the main line is divided into two branch line; The main line is connected with the ammeter of each phase and the universal transfer switch in sequence, and the output end of the universal transfer switch is connected with a first-level residual current action protection module, and the first-level residual current action protection module includes a residual current protector and a current transformer. There is also a reactive power compensation controller; A secondary residual current action protection module and a first fault simulation module are arranged on the first trunk line, and a third level residual current action protection module and a second fault simulation module are arranged on the second trunk line. 2. The three-level residual current operating protection simulation training system according to claim 1, wherein the secondary residual current operating protection module includes a first residual current operating circuit breaker and a second residual current operating circuit breaker, Both the first residual current operated circuit breaker and the second residual current operated circuit breaker are connected to the first trunk; the first fault simulation module includes a first impedance unit and a first switch; one end of the first switch is connected to the first branch The main line is connected, the other end is connected with the first impedance unit, and the first impedance unit is grounded. 3. The three-level residual current operating protection simulation training system according to claim 2, wherein the three-level residual current operating protection module includes a third residual current operating circuit breaker, a fourth residual current operating circuit breaker and The fifth residual current operated circuit breaker, the above three residual current operated circuit breakers are all connected to the second trunk line; the second fault simulation module includes a second impedance unit and a second switch, one end of the second switch is connected to the second branch trunk line The other end is connected to the second impedance unit, and the second impedance unit is grounded. 4. The three-level residual current operating protection simulation training system according to claim 1, 2 or 3, wherein the first fault simulation module and the second fault simulation module are both connected to a background computer. 5. The three-level residual current operating protection simulation training system according to claim 1, 2 or 3, wherein a voltage display unit is also provided on the main line. 6. The three-level residual current operating protection simulation training system according to claim 1, 2 or 3, wherein the model of the residual current protector is JD6-6, and the current transformer is a zero-sequence current mutual inductance device, the model of the reactive power compensation controller is JKWD5. 7 . The three-level residual current operating protection simulation training system according to claim 3 , wherein the models of the first to fifth residual current operating circuit breakers are QLL1-1000Z.