A relay protection fault simulation device

Abstract

The invention discloses a fault simulation device for relay protection workers, comprising a power input end connected to a transformer, a secondary first coil and a secondary second coil at an output end of the transformer, a voltage loss protection simulation loop input end connected to the secondary second coil, and a voltage loss relay arranged between the voltage loss protection simulation loop input end and the voltage loss protection simulation loop output end; a tripping simulation loop input end connected to the secondary second coil, a first resistor and a tripping relay arranged in sequence between the tripping simulation loop input end and the tripping simulation loop output end, an alarm simulation loop input end connected to the secondary first coil, a second resistor and an alarm relay arranged in sequence between the alarm simulation loop input end and the alarm simulation loop output end. The device can effectively simulate the action state of relay protection faults, can flexibly set the type of fault simulation, is simple to operate, and has strong confidentiality, thereby greatly shortening the practical training preparation time and improving the examination efficiency of relay protection workers.

Description

Technical Field

[0001] The invention relates to the technical field of relay protection fault devices, in particular to a relay protection fault simulation device. Background Art

[0002] At present, many relay protection examinations are completed by trainers manually setting faults. For example, a protection logic needs to be input through a special instrument to meet the simulated relay protection fault action state. The disadvantage is that the manual setting of faults by trainers has increasingly exposed many problems in practical training. The types of faults set lack flexibility, rewiring is required when switching faults, the operation is complicated, and the confidentiality is poor. Summary of the invention

[0003] The invention aims to provide a relay protection fault simulation device which is simple to operate and highly confidential.

[0004] A relay protection fault simulation device according to the present invention comprises a power input terminal, a voltage loss protection simulation circuit, a trip simulation circuit and an alarm simulation circuit, wherein the power input terminal is connected to a transformer, and the output terminal of the transformer comprises a secondary first coil and a secondary second coil, wherein the secondary first coil and the secondary second coil are connected in series;

[0005] The undervoltage protection simulation circuit includes an undervoltage protection simulation circuit input end and an undervoltage protection simulation circuit output end, the undervoltage protection simulation circuit input end is connected to the secondary second coil, and an undervoltage relay for controlling the input voltage and the output voltage is arranged between the undervoltage protection simulation circuit input end and the undervoltage protection simulation circuit output end;

[0006] The trip simulation circuit comprises a trip simulation circuit input end and a trip simulation circuit output end, the trip simulation circuit input end is connected to the secondary second coil, a first resistor and a trip relay for generating a trip current are respectively arranged between the trip simulation circuit input end and the trip simulation circuit output end, and the first resistor and the trip relay are connected in series;

[0007] The alarm simulation circuit includes an alarm simulation circuit input terminal and an alarm simulation circuit output terminal, the alarm simulation circuit input terminal is connected to a secondary coil, a second resistor and an alarm relay for generating an alarm current are respectively arranged between the alarm simulation circuit input terminal and the alarm simulation circuit output terminal, and the second resistor and the alarm relay are connected in series.

[0008] The relay protection worker fault simulation device is described, by setting a transformer at the power input end, reducing the voltage to provide input power for each simulation circuit, preventing the relay protection worker from the hidden danger of electric shock during training operation, and effectively improving the safety of training for operating the fault simulation device. By setting the secondary coil 1 and the secondary coil 2 at the output end of the transformer, different voltages can be generated, and then different currents can be generated, and different fault states of different simulation circuits can be distinguished. The output end of the transformer is convenient for further expansion of multiple groups of coils, which is low in cost compared to the PLC control module or relay protection instrument control, and the functional state achieved has strong later expandability. By setting a pressure loss relay for controlling the on and off of input voltage and output voltage between the input end and the output end of the pressure loss protection simulation circuit, respectively setting a first resistor and a tripping relay for generating tripping current between the input end and the output end of the tripping simulation circuit, respectively setting a second resistor and an alarm relay for generating alarm current between the input end and the output end of the alarm simulation circuit, respectively, the fault action state of the relay protection can be effectively simulated, the type of fault simulation can be flexibly set, the operation is simple, and the confidentiality is strong, thereby greatly shortening the practical training preparation time and improving the examination efficiency of relay protection workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The present invention is an electrical schematic diagram of a relay protection fault simulation device. DETAILED DESCRIPTION

[0010] like Figure 1 As shown, a relay protection fault simulation device according to the present invention comprises a power input terminal, a voltage loss protection simulation circuit, a trip simulation circuit and an alarm simulation circuit, wherein the power input terminal is connected to a transformer, and the output terminal of the transformer comprises a secondary first coil L1 and a secondary second coil L2, wherein the secondary first coil L1 and the secondary second coil L2 are connected in series;

[0011] The undervoltage protection simulation circuit includes an undervoltage protection simulation circuit input end and an undervoltage protection simulation circuit output end, the undervoltage protection simulation circuit input end is connected to the secondary second coil L2, and an undervoltage relay KM1 for controlling the input voltage and output voltage is arranged between the undervoltage protection simulation circuit input end and the undervoltage protection simulation circuit output end;

[0012] The trip simulation circuit comprises a trip simulation circuit input end and a trip simulation circuit output end, the trip simulation circuit input end is connected to the secondary second coil L2, a first resistor R1 and a trip relay for generating a trip current are respectively arranged between the trip simulation circuit input end and the trip simulation circuit output end, and the first resistor R1 and the trip relay are connected in series;

[0013] The alarm simulation circuit includes an alarm simulation circuit input terminal and an alarm simulation circuit output terminal, the alarm simulation circuit input terminal is connected to a secondary coil L1, a second resistor R2 for generating an alarm current and an alarm relay are respectively arranged between the alarm simulation circuit input terminal and the alarm simulation circuit output terminal, and the second resistor R2 and the alarm relay are connected in series.

[0014] By setting a transformer at the power input end, the voltage is stepped down to provide input power for each simulation circuit, preventing the relay protection worker from the risk of electric shock during training operation, and effectively improving the safety of training for operating fault simulation devices. By setting the secondary coil L1 and the secondary coil L2 at the output end of the transformer, different voltages can be generated, and then different currents can be generated to distinguish the states of different faults in different simulation circuits. The output end of the transformer is convenient for further expansion of multiple groups of coils, which is low in cost compared to the PLC control module or relay protection instrument control, and the functional state achieved has strong later scalability. By setting a pressure loss relay for controlling the on and off of input voltage and output voltage between the input end and the output end of the pressure loss protection simulation circuit, respectively setting a first resistor R1 for generating tripping current and a tripping relay between the input end and the output end of the tripping simulation circuit, respectively setting a second resistor R2 for generating alarm current and an alarm relay between the input end and the output end of the alarm simulation circuit, respectively, it is possible to effectively simulate the action state of relay protection faults, flexibly set the type of fault simulation, simple operation, and high confidentiality, thereby greatly shortening the practical training preparation time and improving the examination efficiency of relay protection workers.

[0015] The alarm simulation circuit includes an overload alarm simulation circuit and a zero-sequence alarm simulation circuit. The overload alarm simulation circuit is provided with an overload alarm relay KM2 for simulating the output alarm current, and the zero-sequence alarm simulation circuit is provided with a zero-sequence alarm relay KM4 for simulating the output alarm current.

[0016] The overload alarm relay KM2 is provided with two ends A2-1 and A2-2 of the overload alarm relay coil connected to the power supply for powering on, a second normally open contact KM2-2 of the overload alarm relay for controlling the analog output alarm current of the overload alarm analog circuit, and a third normally open contact KM2-3 of the overload alarm relay for controlling the overload state alarm of the buzzer GF; one end A2-1 of the overload alarm relay is provided with a first normally open contact KM2-1 of the overload alarm relay for controlling the powering on of the overload alarm relay KM2 and an overload alarm relay button switch SB2, the first normally open contact KM2-1 of the overload alarm relay and the overload alarm relay button switch SB2 are connected in parallel and electrically connected to the power supply; the third normally open contact KM2-3 of the overload alarm relay is connected in series with the buzzer GF and electrically connected to the power supply.

[0017] By closing the overload alarm relay button switch SB2, the two ends of the overload alarm relay coil A2-1, A2-2 are connected to the power supply and energized. At this time, the first normally open contact KM2-1 of the overload alarm relay is closed, and the second normally open contact KM2-2 of the overload alarm relay is also closed. The overload alarm simulation circuit can realize the output of simulated overload alarm current, thereby realizing the status simulation output of overload alarm; moreover, at this time, the third normally open contact KM2-3 of the overload alarm relay is also closed, and the buzzer GF starts to emit an overload alarm sound, further reminding the operating personnel that it is in an overload state at this time, thereby improving the examination efficiency of relay protection workers.

[0018] The zero-sequence alarm relay KM4 is provided with two ends A4-1 and A4-2 of the zero-sequence alarm relay coil connected to the power supply for power supply, a second normally open contact KM4-2 of the zero-sequence alarm relay for controlling the zero-sequence alarm simulation circuit to simulate the output alarm current, and a third normally open contact KM4-3 of the zero-sequence alarm relay for controlling the buzzer GF to alarm the zero-sequence state; one end A4-1 of the zero-sequence alarm relay is provided with a first normally open contact KM4-1 of the zero-sequence alarm relay for controlling the power supply of the zero-sequence alarm relay KM4 and a zero-sequence alarm relay button switch SB4, the first normally open contact KM4-1 of the zero-sequence alarm relay and the zero-sequence alarm relay button switch SB4 are connected in parallel and electrically connected to the power supply; the third normally open contact KM4-3 of the zero-sequence alarm relay is connected in series with the buzzer GF and electrically connected to the power supply.

[0019] By closing the zero-sequence alarm relay button switch SB4, the two ends A4-1 and A4-2 of the zero-sequence alarm relay coil are connected to the power supply and energized. At this time, the first normally open contact KM4-1 of the zero-sequence alarm relay is closed, and the second normally open contact KM4-2 of the zero-sequence alarm relay is also closed. The zero-sequence alarm simulation circuit can realize the output of simulated zero-sequence alarm current, thereby realizing the status simulation output of zero-sequence alarm; moreover, the third normally open contact KM4-3 of the zero-sequence alarm relay is also closed at this time, and the buzzer GF starts to emit a zero-sequence alarm sound, further reminding the operating personnel that this is the zero-sequence alarm state, thereby improving the examination efficiency of relay protection workers.

[0020] The tripping simulation circuit includes an overload tripping simulation circuit and a zero-sequence tripping simulation circuit. The overload tripping simulation circuit is provided with an overload tripping relay KM3 for simulating the output tripping current, and the zero-sequence tripping simulation circuit is provided with a zero-sequence tripping relay KM5 for simulating the output tripping current.

[0021] The overload trip relay KM3 is provided with two ends A3-1 and A3-2 of the overload trip relay coil connected to the power supply for powering on, the second normally open contact KM3-2 of the overload trip relay for controlling the analog output trip current of the overload trip simulation circuit, and the third normally open contact KM3-3 of the overload trip relay for controlling the overload trip alarm of the buzzer TF; one end A3-1 of the overload trip relay is provided with the first normally open contact KM3-1 of the overload trip relay for controlling the powering on of the overload trip relay KM3 and the overload trip relay button switch SB3, the first normally open contact KM3-1 of the overload trip relay and the overload trip relay button switch SB3 are connected in parallel and electrically connected to the power supply; the third normally open contact KM3-3 of the overload trip relay is connected in series with the buzzer TF and electrically connected to the power supply.

[0022] By closing the overload trip relay button switch SB3, the two ends of the overload trip relay coil A3-1, A3-2 are connected to the power supply and energized. At this time, the first normally open contact KM3-1 of the overload trip relay is closed, and the second normally open contact KM3-2 of the overload trip relay is also closed. The overload trip simulation circuit can realize the output of the simulated overload trip current, thereby realizing the overload trip state simulation output; moreover, at this time, the third normally open contact KM3-3 of the overload trip relay is also closed, and the buzzer TF starts to emit an overload trip alarm sound, further reminding the operating personnel that it is in the overload trip state at this time, thereby improving the examination efficiency of the relay protection workers.

[0023] The zero-sequence trip relay KM5 is provided with two ends A5-1 and A5-2 of the zero-sequence trip relay coil connected to the power supply for power supply, the second normally open contact KM5-2 of the zero-sequence trip relay for controlling the zero-sequence trip simulation circuit to simulate the output trip current, and the third normally open contact KM5-3 of the zero-sequence trip relay for controlling the zero-sequence trip alarm of the buzzer TF; one end A5-1 of the zero-sequence trip relay is provided with the first normally open contact KM5-1 of the zero-sequence trip relay for controlling the power supply of the zero-sequence trip relay KM5 and the zero-sequence trip relay button switch SB5, the first normally open contact KM5-1 of the zero-sequence trip relay and the zero-sequence trip relay button switch SB5 are connected in parallel and electrically connected to the power supply; the third normally open contact KM5-3 of the zero-sequence trip relay is connected in series with the buzzer TF and electrically connected to the power supply.

[0024] By closing the zero-sequence tripping relay button switch SB5, the two ends A5-1 and A5-2 of the zero-sequence tripping relay coil are connected to the power supply and energized. At this time, the first normally open contact KM5-1 of the zero-sequence tripping relay is closed, and the second normally open contact KM5-2 of the zero-sequence tripping relay is also closed. The zero-sequence tripping simulation circuit can realize the output of simulated zero-sequence tripping current, thereby realizing the simulation output of the zero-sequence tripping state; moreover, the third normally open contact KM5-3 of the zero-sequence tripping relay is also closed at this time, and the buzzer TF starts to emit a zero-sequence tripping alarm sound, further reminding the operating personnel that this is the zero-sequence tripping state, thereby improving the examination efficiency of relay protection workers.

[0025] The pressure-loss relay KM1 is provided with a pressure-loss relay normally closed contact KM1-1 for controlling the on and off of the input voltage and the output voltage, and two ends A1-1 and A1-2 of the pressure-loss relay coil connected to the power supply for powering on. One end A1-1 of the pressure-loss relay coil is provided with a first normally open contact KM1-2 of the pressure-loss relay for controlling the powering on of the pressure-loss relay KM1 and a pressure-loss relay button switch SB1. The first normally open contact KM1-2 of the pressure-loss relay and the pressure-loss relay button switch SB1 are connected in parallel and electrically connected to the power supply.

[0026] By closing the pressure loss relay button switch SB1, the two ends of the pressure loss relay coil A1-1, A1-2 are connected to the power supply and energized. At this time, the first normally open contact KM1-2 of the pressure loss relay is closed, and the normally closed contact KM1-1 of the pressure loss relay is opened. The pressure loss protection simulation circuit can realize the output of simulated pressure loss, thereby realizing the simulated output of the pressure loss state. This effectively simulates the pressure loss of the external environment.

[0027] The pressure loss relay KM1 is also provided with a second normally open contact KM1-3 of the pressure loss relay for controlling the on and off of the pressure loss status light of the display light SD. The second normally open contact KM1-3 of the pressure loss relay is connected in series with the display light SD and is electrically connected to the power supply. The pressure loss of the simulated external environment can be effectively observed through the display light SD.

[0028] The pressure loss relay KM1 is also provided with a third normally open contact KM1-4 of the pressure loss relay for controlling the pressure loss state alarm of the buzzer TF. The second normally open contact KM1-4 of the pressure loss relay is connected in series with the buzzer TF and is electrically connected to the power supply. The sound of the buzzer TF further generates a pressure loss alarm, which can improve the examination efficiency of the relay protection worker.

[0029] The power supply is also provided with a reset switch FA electrically connected to each relay, which can realize the reset of all simulations of the fault simulation device.

[0030] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A relay protection fault simulation device, characterized in that: It comprises a power input terminal, a voltage loss protection simulation circuit, a trip simulation circuit and an alarm simulation circuit, wherein the power input terminal is connected to a transformer, and the output terminal of the transformer comprises a secondary first coil (L1) and a secondary second coil (L2), wherein the secondary first coil (L1) and the secondary second coil (L2) are connected in series; The undervoltage protection simulation circuit comprises an undervoltage protection simulation circuit input terminal and an undervoltage protection simulation circuit output terminal, wherein the undervoltage protection simulation circuit input terminal is connected to the secondary second coil (L2), and an undervoltage relay (KM1) for controlling the on and off of input voltage and output voltage is arranged between the undervoltage protection simulation circuit input terminal and the undervoltage protection simulation circuit output terminal; The trip simulation circuit comprises a trip simulation circuit input end and a trip simulation circuit output end, the trip simulation circuit input end is connected to the secondary second coil (L2), a first resistor (R1) generating a trip current and a trip relay are respectively arranged between the trip simulation circuit input end and the trip simulation circuit output end, and the first resistor (R1) and the trip relay are connected in series; The alarm simulation circuit comprises an alarm simulation circuit input end and an alarm simulation circuit output end, the alarm simulation circuit input end is connected to a secondary coil (L1), a second resistor (R2) for generating an alarm current and an alarm relay are respectively arranged between the alarm simulation circuit input end and the alarm simulation circuit output end, and the second resistor (R2) and the alarm relay are connected in series; The alarm simulation circuit includes an overload alarm simulation circuit and a zero-sequence alarm simulation circuit. The overload alarm simulation circuit is provided with an overload alarm relay (KM2) for simulating the output alarm current, and the zero-sequence alarm simulation circuit is provided with a zero-sequence alarm relay (KM4) for simulating the output alarm current. The trip simulation circuit includes an overload trip simulation circuit and a zero-sequence trip simulation circuit. The overload trip simulation circuit is provided with an overload trip relay (KM3) for simulating the output trip current, and the zero-sequence trip simulation circuit is provided with a zero-sequence trip relay (KM5) for simulating the output trip current. The pressure loss relay (KM1) is provided with a pressure loss relay normally closed contact (KM1-1) for controlling the input voltage and the output voltage to be turned on and off, and two ends (A1-1, A1-2) of the pressure loss relay coil connected to the power supply for powering on. One end (A1-1) of the pressure loss relay coil is provided with a pressure loss relay first normally open contact (KM1-2) for controlling the pressure loss relay (KM1) to be powered on and a pressure loss relay button switch (SB1). The pressure loss relay first normally open contact (KM1-2) and the pressure loss relay button switch (SB1) are connected in parallel and are electrically connected to the power supply.

2. A relay protection fault simulation device according to claim 1, characterized in that: The pressure loss relay (KM1) is also provided with a second normally open contact (KM1-3) of the pressure loss relay for controlling the on and off of the pressure loss status light of the display light (SD). The second normally open contact (KM1-3) of the pressure loss relay is connected in series with the display light (SD) and is electrically connected to the power supply.

3. A relay protection fault simulation device according to any one of claims 1-2, characterized in that: The pressure loss relay (KM1) is also provided with a third normally open contact (KM1-4) of the pressure loss relay for controlling the pressure loss state alarm of the buzzer (TF). The third normally open contact (KM1-4) of the pressure loss relay is connected in series with the buzzer (TF) and is electrically connected to the power supply.

4. The relay protection fault simulation device according to claim 1, characterized in that: The overload alarm relay (KM2) is provided with two ends (A2-1, A2-2) of the overload alarm relay coil connected to the power supply, a second normally open contact (KM2-2) of the overload alarm relay for controlling the analog output alarm current of the overload alarm analog circuit, and a third normally open contact (KM2-3) of the overload alarm relay for controlling the buzzer (GF) to alarm the overload state; One end (A2-1) of the overload alarm relay is provided with a first normally open contact (KM2-1) of the overload alarm relay for controlling the overload alarm relay (KM2) to be powered on and an overload alarm relay push button switch (SB2); the first normally open contact (KM2-1) of the overload alarm relay and the overload alarm relay push button switch (SB2) are connected in parallel and are electrically connected to a power supply; The third normally open contact (KM2-3) of the overload alarm relay is connected in series with the buzzer (GF) and is electrically connected to the power supply.

5. The relay protection fault simulation device according to claim 1, characterized in that: The zero-sequence alarm relay (KM4) is provided with two ends (A4-1, A4-2) of the zero-sequence alarm relay coil connected to the power supply, a second normally open contact (KM4-2) of the zero-sequence alarm relay for controlling the zero-sequence alarm simulation circuit to simulate the output alarm current, and a third normally open contact (KM4-3) of the zero-sequence alarm relay for controlling the buzzer (GF) to alarm when the buzzer passes the zero-sequence state; One end (A4-1) of the zero-sequence alarm relay is provided with a first normally open contact (KM4-1) of the zero-sequence alarm relay for controlling the power-on of the zero-sequence alarm relay (KM4) and a zero-sequence alarm relay push button switch (SB4); the first normally open contact (KM4-1) of the zero-sequence alarm relay and the zero-sequence alarm relay push button switch (SB4) are connected in parallel and are electrically connected to a power supply; The third normally open contact (KM4-3) of the zero-sequence alarm relay is connected in series with the buzzer (GF) and is electrically connected to the power supply.

6. The relay protection fault simulation device according to claim 1, characterized in that: The overload trip relay (KM3) is provided with two ends (A3-1, A3-2) of the overload trip relay coil connected to the power supply, a second normally open contact (KM3-2) of the overload trip relay for controlling the overload trip simulation circuit to simulate the output trip current, and a third normally open contact (KM3-3) of the overload trip relay for controlling the buzzer (TF) overload trip alarm; One end (A3-1) of the overload trip relay is provided with a first normally open contact (KM3-1) of the overload trip relay for controlling the overload trip relay (KM3) to be powered on and an overload trip relay push button switch (SB3); the first normally open contact (KM3-1) of the overload trip relay and the overload trip relay push button switch (SB3) are connected in parallel and are electrically connected to a power supply; The third normally open contact (KM3-3) of the overload tripping relay is connected in series with the buzzer (TF) and is electrically connected to the power supply.

7. The relay protection fault simulation device according to claim 1, characterized in that: The zero-sequence trip relay (KM5) is provided with two ends (A5-1, A5-2) of the zero-sequence trip relay coil connected to the power supply, a second normally open contact (KM5-2) of the zero-sequence trip relay for controlling the zero-sequence trip simulation circuit to simulate the output trip current, and a third normally open contact (KM5-3) of the zero-sequence trip relay for controlling the buzzer (TF) zero-sequence trip alarm; One end (A5-1) of the zero-sequence trip relay is provided with a first normally open contact (KM5-1) of the zero-sequence trip relay for controlling the power-on of the zero-sequence trip relay (KM5) and a zero-sequence trip relay push button switch (SB5); the first normally open contact (KM5-1) of the zero-sequence trip relay and the zero-sequence trip relay push button switch (SB5) are connected in parallel and are electrically connected to a power supply; The third normally open contact (KM5-3) of the zero-sequence tripping relay is connected in series with the buzzer (TF) and is electrically connected to the power supply.

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