Portable single-phase earth fault simulation device

Abstract

The utility model discloses a portable single-phase earth fault simulation device, which comprises a shell, and an input end, a transformer, a relay, resistors R1-R4, an output end and a control button are arranged in the shell. The control button realizes the change of the output voltage of the output end by controlling the switching of the normally open and normally closed nodes of the relay, thereby simulating the switching between the normal state and the single-phase earth fault state of the system. According to the utility model, the single-phase earth fault simulation device is made into a small device convenient to carry, has the advantages of small size, light weight, convenient carrying, low manufacturing cost, simplicity, safety, easy operation and the like, and is convenient for field debugging engineers to debug single-phase earth fault processing products; the problem of single-phase earth fault simulation test under the condition that no relay protection tester exists in a debugging site is solved.

Description

Technical Field

[0001] This utility model relates to the field of power fault detection technology, and in particular to a portable single-phase grounding fault simulation device. Background Technology

[0002] Currently, after-sales engineers in the power industry need relay protection testing instruments when debugging single-phase grounding products to simulate single-phase grounding faults. However, these instruments are large and weigh tens of kilograms, making them very inconvenient to carry to the debugging site. This prevents after-sales engineers from simulating single-phase grounding faults to verify the product's performance during debugging.

[0003] Therefore, there is an urgent need to provide a new type of portable single-phase ground fault simulation device to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a small and lightweight portable single-phase grounding fault simulation device, which has the function of switching voltage signals between the normal state and the single-phase grounding fault state of the relay protection test instrument simulation system, and solves the problem that the relay protection test instrument is large, heavy and inconvenient to carry.

[0005] To solve the above-mentioned technical problems, the present invention provides a portable single-phase ground fault simulation device, including a housing, and inside the housing are an input terminal, a transformer, a relay, resistors R1-R4, an output terminal, and a control button.

[0006] The input terminal is electrically connected to the input terminal of the transformer. One end of the output terminal of the transformer is electrically connected to the common terminal of the relay. The other end of the output terminal of the transformer is electrically connected to the N terminal of the output terminal. The control terminal of the relay is electrically connected to the control button. The two normally closed contacts of the relay are electrically connected to one end of resistors R1 and R3, respectively. The other ends of resistors R1 and R3 are electrically connected to the A and B terminals of the output terminal, respectively, and to one end of resistors R2 and R4, respectively. The other ends of resistors R2 and R4 are short-circuited and electrically connected to the N terminal of the output terminal. The two normally open contacts of the relay are electrically connected to the C and U0 terminals of the output terminal, respectively.

[0007] In a preferred embodiment of this utility model, the voltage value at the input terminal is determined by the input voltage range of the transformer. The input voltage of the transformer is AC220V / AC110V, the output voltage is 100V, and the power value ranges from 1 to 10W.

[0008] In a preferred embodiment of this utility model, the relay is a controllable relay having two sets of normally open contacts and two sets of normally closed contacts.

[0009] Furthermore, the control button controls the relay's operation by opening and closing the button, causing its normally open and normally closed nodes to switch states as needed.

[0010] In a preferred embodiment of this utility model, the resistance power of resistors R1-R4 ranges from 1 to 50W, and the resistance value ranges from 5K to 50KΩ.

[0011] In a preferred embodiment of this utility model, the output terminal has five output terminals, the output voltage is consistent with the secondary voltage of the transformer, and is controlled by the relay to switch between the normal voltage and the single-phase ground fault voltage of the simulation system PT.

[0012] In a preferred embodiment of this utility model, the total volume of the housing does not exceed 0.6L.

[0013] The beneficial effects of this utility model are:

[0014] (1) This utility model discloses a portable single-phase ground fault simulation device. The device mainly consists of an input terminal, a transformer, a relay, a resistor, a control button, and an output terminal. The input terminal voltage is AC220V or AC110V. The transformer converts the input terminal voltage into a secondary voltage that is the same as the system PT voltage. The control button controls the opening and closing of the relay, so that the output terminal voltage is switched between the normal state of the system and the single-phase ground fault state under different voltage division states of the resistor, thereby simulating the switching between the normal state of the system and the single-phase ground fault state.

[0015] (2) This utility model has advantages such as small size, light weight, easy to carry, low cost, simple, safe and easy to operate. It has the function of switching voltage signals between the normal state and single-phase grounding fault state of the relay protection tester simulation system, and solves the problems of large size, heavy weight and inconvenience of carrying the relay protection tester. Attached Figure Description

[0016] Figure 1 This is an internal circuit diagram of a preferred embodiment of the portable single-phase grounding fault simulation device of this utility model.

[0017] The components in the attached diagram are labeled as follows: 1. Input terminal; 2. Transformer; 3. Relay; 4. Resistor; 5. Output terminal; 6. Control button. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0019] Please see Figure 1 The embodiments of this utility model include:

[0020] A portable single-phase ground fault simulation device includes a housing, and inside the housing are an input terminal 1, a transformer 2, a relay 3, resistors R1-R4, an output terminal 5, and a control button 6.

[0021] The input terminal 1 is electrically connected to the input terminal of the transformer 2. One end of the output terminal of the transformer 2 is electrically connected to the common terminal of the relay 3. The other end of the output terminal of the transformer 2 is electrically connected to the N terminal of the output terminal 5. The control terminal of the relay 3 is electrically connected to the control button 6. The two normally closed contacts of the relay 3 are electrically connected to one end of resistors R1 and R3, respectively. The other ends of resistors R1 and R3 are electrically connected to the A and B terminals of the output terminal 5, respectively, and to one end of resistors R2 and R4, respectively. The other ends of resistors R2 and R4 are short-circuited and electrically connected to the N terminal of the output terminal 5. The two normally open contacts of the relay 3 are electrically connected to the C and U0 terminals of the output terminal 5, respectively.

[0022] The power rating of resistors R1-R4 ranges from 1 to 50W, and the resistance value ranges from 5KΩ to 50KΩ.

[0023] The voltage value of the input terminal 1 is determined by the input voltage range of the transformer 2. The input voltage of the transformer 2 is AC220V / AC110V, the output voltage is 100V, and the power range is 1 to 10W.

[0024] Preferably, the relay 3 is a controllable relay with two sets of normally open contacts and two sets of normally closed contacts.

[0025] Furthermore, the control button 6 controls the operation of the relay 3 by opening and closing the button, so that its normally open and normally closed nodes switch states as needed, thereby realizing the change of the output voltage at the output terminal, and thus simulating the switching between the normal state and the single-phase ground fault state of the system.

[0026] The output terminal 5 has five output terminals, namely A, B, C, U0, and N terminals. The rated output voltage is 100V, which is consistent with the secondary voltage of transformer 2. It is controlled by the relay 3 to switch between the normal voltage and the single-phase ground fault voltage of the simulated system PT (system bus voltage transformer).

[0027] The input voltage of this single-phase ground fault simulation device is AC220V or AC110V. Transformer 2 converts the input voltage of input terminal 1 into a secondary voltage that is the same as the system PT voltage. By controlling the opening and closing of relay 3 through control button 6, the output voltage of output terminal 5 is switched between the normal system state and the single-phase ground fault state under different voltage division states of resistor 4, thereby simulating the switching between the normal system state and the single-phase ground fault state.

[0028] Specifically, when relay 3 coil is not energized, the normally open contact is open, and the normally closed contact is closed, the voltage division ratio of resistors R1 and R2 is 4:6, and the voltage division ratio of resistors R3 and R4 is also 4:6. That is, the voltages at the output terminals AN, BN, and CN are all 60V, and the voltage at U0 is 0V. At this time, the output voltage can simulate the voltage under normal system conditions. When relay 3 coil is energized, the normally open contact is closed, and the normally closed contact is open, there is no voltage across resistors R1, R2, R3, and R4. That is, the voltage at the output terminals AN is 0V, and the voltages at BN, CN, and U0 are all 100V. At this time, the output voltage can simulate the voltage under A-phase ground fault conditions.

[0029] This invention transforms a single-phase grounding fault simulation device into a portable small device that can replace a relay protection tester to simulate single-phase grounding faults at the commissioning site. It not only meets the on-site commissioning simulation test requirements of single-phase grounding products, but also keeps the total volume of the casing to no more than 0.6L. It has advantages such as small size, light weight, portability, low cost, simplicity, safety, and ease of operation, and solves the problem that after-sales engineers cannot simulate single-phase grounding faults to verify product performance when commissioning products.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A portable single-phase ground fault simulation device, comprising a housing, characterized in that, The housing includes an input terminal, a transformer, a relay, resistors R1-R4, an output terminal, and a control button. The input terminal is electrically connected to the input terminal of the transformer. One end of the output terminal of the transformer is electrically connected to the common terminal of the relay. The other end of the output terminal of the transformer is electrically connected to the N terminal of the output terminal. The control terminal of the relay is electrically connected to the control button. The two normally closed contacts of the relay are electrically connected to one end of resistors R1 and R3, respectively. The other ends of resistors R1 and R3 are electrically connected to the A and B terminals of the output terminal, respectively, and to one end of resistors R2 and R4, respectively. The other ends of resistors R2 and R4 are short-circuited and electrically connected to the N terminal of the output terminal. The two normally open contacts of the relay are electrically connected to the C and U0 terminals of the output terminal, respectively.

2. The portable single-phase ground fault simulation device according to claim 1, characterized in that, The voltage value at the input terminal is determined by the input voltage range of the transformer. The input voltage of the transformer is AC220V / AC110V, the output voltage is 100V, and the power range is 1 to 10W.

3. The portable single-phase ground fault simulation device according to claim 1, characterized in that, The relay is a controllable relay with two sets of normally open contacts and two sets of normally closed contacts.

4. The portable single-phase ground fault simulation device according to claim 3, characterized in that, The control button controls the relay's operation by opening and closing the button, causing its normally open and normally closed nodes to switch states as needed.

5. The portable single-phase ground fault simulation device according to claim 1, characterized in that, The power rating of resistors R1-R4 ranges from 1 to 50W, and the resistance value ranges from 5K to 50KΩ.

6. The portable single-phase ground fault simulation device according to claim 1, characterized in that, The output terminal has five output terminals, and the output voltage is consistent with the secondary voltage of the transformer. It is controlled by the relay to switch between the normal voltage and the single-phase ground fault voltage of the simulation system PT.

7. The portable single-phase ground fault simulation device according to claim 1, characterized in that, The total volume of the shell does not exceed 0.6L.

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