CN220552963U - DC system grounding and looped network fault simulation circuit - Google Patents

Abstract

The utility model relates to a DC system grounding and looped network fault simulation circuit, comprising: the first alternating current-to-direct current power supply and the second alternating current-to-direct current power supply; the instruction unit is powered by a first alternating current-to-direct current power supply; and relays coupled to the instruction unit via at least one connector and respectively coupled to the following branches: the positive pole branch of the second alternating current-to-direct current power supply; a negative branch of the second alternating current-to-direct current power supply; the first resistor is grounded; the second resistor is grounded, and the first resistor is larger than the second resistor; wherein the relay is configured to simulate direct current ground or direct current cross-talk detection with one or more of the positive leg, the negative leg, the first resistive ground leg, and the second resistive ground leg in response to a control operation of the command unit. The utility model provides a testing environment for companies making the detection equipment, avoids the inconvenience of transporting the actual application equipment to the acceptance site, reduces the transportation cost and improves the efficiency of the whole acceptance process.

Description

DC system grounding and looped network fault simulation circuit

Technical Field

The utility model relates to the technical field of power systems, in particular to a direct current system grounding and looped network fault simulation circuit.

Background

In the society, all industries are not powered off. The demand for electricity is increasing. For electrical safety, various companies are also very many related products to detect the direct current system of a substation or a power plant. However, the equipment of the transformer substation and the power plant is very large, and is inconvenient to transport to the supplier for checking and accepting products detected by the supplier. However, the acceptance process is time-consuming and labor-consuming, generates a great deal of cost, and is not safe enough for on-site acceptance, so that safety accidents are easy to cause due to carelessness in operation. Meanwhile, the field test can only detect the equipment in the current period, the simulation can not be continuously carried out according to the actual needs, and the frequent detection and acceptance obviously reduce the economic benefit

The current ring network fault or direct current grounding is measured through manual visual inspection or manual carrying of a measuring tool. Has the defects of low efficiency, high cost and the like.

Therefore, a new dc system grounding and ring network fault simulation circuit needs to be provided for inconvenient transportation of equipment of a variable power plant and a power plant so as to provide a test environment for a company detecting the equipment to detect the dc system of the transformer substation and the power plant.

Disclosure of Invention

In view of the shortcomings of the prior art, the main purpose of the utility model is to provide a direct current system grounding and looped network fault simulation circuit, so as to solve the inconvenience and other potential problems of equipment transportation to a check-out site of a power transformation plant and a power plant in the prior art.

The technical scheme of the utility model is as follows:

the utility model provides a DC system grounding and looped network fault simulation circuit, which comprises:

the first alternating current-to-direct current power supply and the second alternating current-to-direct current power supply;

the instruction unit is powered by the first alternating current-to-direct current power supply; and

a relay electrically coupled to the command unit via at least one connector and respectively coupled to the following branches:

the positive branch of the second alternating current-to-direct current power supply;

a negative branch of the second alternating current-to-direct current power supply;

the first resistor is grounded;

the second resistor is grounded, and the first resistor is larger than the second resistor;

wherein the relay is configured to simulate direct current ground or direct current cross-over detection with one or more of the positive leg, the negative leg, the first resistive ground leg, and the second resistive ground leg in response to a control operation of the instruction unit.

Preferably, the first ac to dc power source is coupled to a battery and adapted to charge the battery, and the battery is coupled to a secondary power source via a boat switch to supply power to the secondary power source when the boat switch is closed.

Preferably, the portable electronic device further comprises a Bluetooth module, wherein the Bluetooth module is coupled to the secondary power supply and communicatively coupled to the instruction unit to send control signals to the instruction unit.

Preferably, the bluetooth module is connected with a terminal and is adapted to send the control signal to the instruction unit under control of the terminal.

Preferably, a buzzer is also included, the buzzer being communicatively coupled to the instruction unit to sound an audible alarm when at least one of dc ground or dc cross-over detection is detected.

Preferably, the optical coupler is electrically coupled to the instruction unit via at least one connector, and is respectively coupled to the following branches:

the positive branch of the second alternating current-to-direct current power supply;

and the negative branch of the second alternating current-to-direct current power supply.

Preferably, the electronic device further comprises an LED lamp electrically coupled to the instruction unit via at least one connector.

Preferably, the portable electronic device further comprises a nixie tube, wherein the nixie tube is electrically coupled to the instruction unit through at least one connector.

Preferably, the first resistor is 40K, and the second resistor is 20K.

Preferably, the instruction unit is a RAM chip.

Compared with the prior art, the direct current system grounding and looped network fault simulation circuit provided by the utility model has the beneficial effects that the requirements that a company for manufacturing detection equipment cannot reach a transformer substation and a power plant on-site detection equipment are met, a simulation test environment is provided for the company for manufacturing the detection equipment to debug the transformer substation and the power plant detection equipment, the inconvenience of transporting practical application equipment to an acceptance site is avoided, the transportation cost is reduced, and the efficiency of the whole set of acceptance process is improved.

The utility model mainly connects direct current power supply to the direct current system grounding and looped network fault simulation circuit, then connects the positive branch of the second alternating current-to-direct current power supply or the negative branch of the second alternating current-to-direct current power supply to the ground or conducts two groups of buses through the first resistor grounding branch and the second resistor grounding branch respectively, is used for simulating the faults of the direct current system grounding and the looped network of the direct current system, and provides great convenience for power plant changing and power plant acceptance inspection and detection equipment.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, but rather by the claims.

FIG. 1 is a system configuration diagram of a DC system grounding and ring network fault simulation circuit of the present utility model;

FIG. 2 is a schematic diagram of a single DC ground simulation of the present utility model, wherein (a) the positive branch is connected to ground through a 40K or 20K resistor and (b) the negative branch is connected to ground through a 40K or 20K resistor;

FIG. 3 is a schematic diagram of the DC-DC cross simulation of the present utility model, wherein (a) is a short circuit of two sections of positive branches and (b) is a short circuit of two sections of negative branches;

fig. 4 is a schematic diagram of reverse access simulation according to the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the embodiments of the present utility model will be described in further detail with reference to the embodiments and the accompanying drawings. The exemplary embodiments of the present utility model and their descriptions herein are for the purpose of explaining the present utility model, but are not to be construed as limiting the utility model.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "coupled," "communicatively coupled," "electrically coupled," and the like are to be construed broadly and may be directly connected or indirectly connected via intermediaries, in which case the two elements communicate or interact with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be understood that the terms "comprises/comprising," "consists of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method as desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," and the like, does not exclude the presence of other like elements in a product, apparatus, process, or method that includes the element.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The implementation of the present utility model will be described in detail with reference to the preferred embodiments.

In this embodiment, each english meaning is as follows: AC: alternating current; AC/DC: ac to dc power supply; 3V3:3.3 volts; TTL: a level signal; GPIO: a general purpose input/output interface; I2C: an integrated circuit bus; +DC220V [1:6]: 6 positive branches of DC220V voltage; -6 negative branches of DC220V [1:6]: DC220V voltage.

As shown in fig. 1, the present utility model provides a dc system grounding and ring network fault simulation circuit, which includes: the first AC-DC power supply 2, the second AC-DC power supply 12, the instruction unit 5, the relay 9 and the connector 13.

Specifically, the command unit 5 is supplied with power from the first ac-dc power supply 2.

In one embodiment, the instruction unit 5 is a RAM chip, through which the operation of the other components is controlled.

The first AC to DC power source 2 and the second AC to DC power source 12 are AC/DC, which is connected to an AC220V voltage 1, i.e. AC220V.

Preferably, the AC220V voltage is output by a delta-shaped high-power outlet.

In one embodiment, the first ac to dc power source 2 is coupled to the battery 3 and adapted to charge the battery 3, and the battery 3 is coupled to the secondary power source 4 via the boat switch 14 to supply power to the secondary power source 4 when the boat switch 14 is closed, the secondary power source 4 being coupled to the command unit 5 to supply power to the command unit 5.

With continued reference to fig. 1, the relay 9 is electrically coupled to the instruction unit 5, e.g. by GPIO, via one or two connectors 13, e.g. by GPIO, and to the following branches, respectively: a positive branch of the second ac-dc power supply 12; a negative branch of the second ac-dc power supply 12; the first resistor R1 is grounded; the second resistor R2 is grounded, and the first resistor R1 is greater than the second resistor R2. Wherein the relay 9 is configured to simulate direct current grounding or direct current cross-over detection with one or more of the positive branch, the negative branch, the first resistor R1 grounding branch, and the second resistor R2 grounding branch in response to a control operation of the instruction unit 5.

It is easy to understand that the relay 9 may be a device including a plurality of single pole double throw electronic switches, and the plurality of single pole double throw electronic switches respectively correspond to different branches, and the single pole double throw electronic switches corresponding to the different branches are controlled to be closed by the instruction unit 5. It should be appreciated that the relay 9 may also be any other suitable relay, as the utility model is not limited in this regard.

Fig. 2 is a schematic diagram of a single-pass dc ground simulation of the present utility model. See (a) and (b) in fig. 2, where (a) is a dc ground fault modeled with a positive leg, a first resistor R1 ground leg, and a second resistor R2 ground leg, and (b) is a dc ground fault modeled with a negative leg, a first resistor R1 ground leg, and a second resistor R2 ground leg.

In one embodiment, the first resistor R1 may be 40K and the second resistor R2 may be 20K. For adapting different dc voltages.

In particular, with continued reference to (a) of fig. 2, two SPDTs (single pole double throw electronic switches) may be coupled using +dc220V-1, one SPDT coupled to a 40k resistor and the other SPDT coupled to a 20k resistor, the outputs of the 40k resistor and the 20k resistor each coupled to a ground terminal. The instruction unit 5 can control the closing and opening of the two SPDTs, when the instruction unit 5 controls the SPDTs on the 40k resistor branch to be closed, the simulation positive circuit is connected to the ground fault through the 40k resistor, and when the instruction unit 5 controls the SPDTs on the 20k resistor branch to be closed, the simulation positive circuit is connected to the ground fault through the 20k resistor.

In fig. 2 (b), two SPDTs (single pole double throw electronic switch) may be coupled with-DC 220V-1, respectively, one SPDT and 40k resistor are coupled, the other SPDT and 20k resistor are coupled, the outputs of both 40k resistor and 20k resistor are coupled to the ground terminal, and the fault of the analog negative branch to the ground through the different resistors is controlled by the command unit 5. The implementation is the same as the implementation of (a) in fig. 2 and will not be specifically described herein.

It should be appreciated that +DC220V-1 may be any of the 6 branches of +DC220V [1:6], -DC220V-1 may be any of the 6 branches of-DC 220V [1:6], i.e., the +DC220V [1:6] and the 6 positive and 6 negative branches of-DC 220V [1:6] may each be used to simulate a DC ground fault.

Fig. 3 is a schematic diagram of the dc-dc mutual interference simulation of the present utility model, and it is easy to understand that the dc-dc mutual interference phenomenon is also called a ring network fault, which is a common fault with a relatively large hazard in the dc system. See fig. 3 (a) and (b), where (a) is to simulate a dc-to-ac fault with a two-segment positive leg short circuit and (b) is to simulate a dc-to-ac fault with a two-segment negative leg short circuit.

In practice, with continued reference to FIG. 3 (a), the SPDT is coupled using the positive branch, i.e., + DC220V-1, and a 10k resistor, the output of which is coupled to the other positive branch, i.e., + DC220V-2. And the SPDT is controlled to be closed by the instruction unit 5, so that the short circuit of the two sections of buses is realized, and the direct current channeling faults of the positive short circuit are simulated.

Fig. 3 (b) is a DC cross-over fault using two negative branches, namely-DC 220V-1 and-DC 220V-2, coupled to SPDT and 10k resistors to simulate a negative short. The implementation is the same as the implementation of (a) in fig. 3 and will not be specifically described herein.

It will be readily appreciated that +DC220V-1 and +DC220V-2 are two particular positive branches of the 6 branches of +DC220V [1:6], respectively, -DC220V-1 and-DC220V-2 are two particular negative branches of the 6 branches of-DC220V [1:6], respectively.

Coupled to the positive pole of the first ac to DC power source 2, -DC220V-2 may be coupled to the negative pole of the first ac to DC power source 2.

With continued reference to fig. 1. In some embodiments, the dc system ground and ring network fault simulation circuit further comprises a bluetooth module 6, the bluetooth module 6 being coupled to the secondary power source 4, for example by 3V3, charged by the secondary power source 4, and communicatively coupled to the instruction unit 5, for example by TTL, to send control signals to the instruction unit 5.

In some embodiments the bluetooth module 6 is connected to the terminal and is adapted to send the control signal to the instruction unit 5 under control of the terminal.

The terminal here may be a micro-letter applet in a mobile phone, and the technician may send the control command to the instruction unit 5 by means of bluetooth wireless communication by operating a button of the mobile phone micro-letter applet. It should be appreciated that the terminal may also be any suitable terminal, as this disclosure is not limited in this regard.

In some embodiments, the dc system ground and ring network fault simulation circuit further comprises a buzzer 7, the buzzer 7 being communicatively coupled to the instruction unit 5, for example by GPIO, to sound an alarm when at least one of dc ground or dc cross detection is detected.

In some embodiments, the dc system ground and ring network fault simulation circuit further comprises an optocoupler 8, the optocoupler 8 being electrically coupled to the instruction unit 5, e.g. by GPIO, via one or two connectors 13, e.g. by GPIO, and being coupled to the following branches, respectively: a positive branch of the second ac-dc power supply 12; the negative branch of the second ac to dc power supply 12.

In some embodiments, the dc system ground and ring network fault simulation circuit further comprises an LED lamp 10, the LED lamp 10 being electrically coupled to the instruction unit 5, e.g. by GPIO, via one or two connectors 13, e.g. by GPIO.

In some embodiments, the dc system ground and ring network fault simulation circuit further comprises a nixie tube 11, wherein the nixie tube 11 is electrically coupled to the instruction unit 5, e.g. through I2C, via one or two connectors 13, e.g. through I2C.

The relay 9, the buzzer 7, the LED lamp 10, the nixie tube 11 and the like are used as controlled components, the command action sent by the command unit 5 is mainly received, the command unit 5 is responsible for receiving the signal of the Bluetooth module 6, the relay 9 and the LED lamp 10 are controlled to work, the signal of the optocoupler 8 is collected, and the audible and visual alarm is controlled; and collecting a battery voltage signal, and controlling the nixie tube 11 to display.

In the utility model, when the ground fault and the direct current channeling fault of the direct current system are simulated, the circuit can generate reverse connection conditions as shown in fig. 4, namely, a-DC 220V-1 and a +DC220V-1 are respectively coupled with a resistor with a resistance value of 51K, a resistor with rated power of 2W and are commonly coupled with an optocoupler, it is easy to understand that the optocoupler is an electronic element for transmitting electric signals between two isolated circuits, that is, the electric signals are transmitted from one circuit to the other circuit, as shown in fig. 4, an A pin and a K pin at the left side of the optocoupler are an LED, wherein the A pin is coupled with the-DC 220V-1 circuit, the K pin is coupled with the +DC220V-1 circuit, the LED emits infrared light to a phototriode, and the infrared light is coupled to the right side, a C pin at the right side is coupled with a 10K resistor through GPIO, the output end of the resistor is coupled with a power source through 3V3, and an E pin at the right side is directly grounded.

The LED lamp emits light under the condition of correct wiring. The drive transistor is turned on so that the transistor is turned on. The negative electrode of the DC220V is connected to the positive electrode of the LED lamp of the optocoupler, and the positive electrode of the DC220V is connected to the negative electrode of the LED lamp of the optocoupler, so that when the DC220V is normally connected to an external binding post, the LED lamp of the optocoupler does not emit light and cannot drive the triode to be conducted. If the DC220V of the external binding post is reversely connected, the LED lamp of the optical coupler emits light, and the drive triode is conducted to trigger signals for the control instruction unit. The control instruction unit drives the audible and visual alarm, and all keys of the micro-communication applet can not be triggered by Bluetooth control.

When the DC grounding or DC channeling faults are simulated, when the positive electrode of the DC220V DC power supply is connected to the negative electrode of the same branch, the negative electrode of the DC220V DC power supply is connected to the positive electrode of the same branch, after the reverse connection, the LED lamp of the optocoupler is lightened, the triode is driven to act, the reverse connection signal is given to the instruction unit, at the moment, the instruction unit is controlled by the DC system grounding and ring network fault simulation terminal to give out instructions to the buzzer for audible and visual alarm, and the alarm is locked through Bluetooth, and all keys of the micro-communication applet are not triggered. The function mainly prevents reverse connection when simulating faults, and the direct current system is grounded and the looped network fault simulation terminal is damaged or the detection equipment is damaged.

Returning to fig. 1. In a specific embodiment, the hardware of the product may be composed of two parts, namely a core board and a main control board.

The core board is mainly a RAM chip minimum system, and the Bluetooth module 6 is communicated with the RAM chip.

The main control board mainly completes the action of the relay 9, the display of the LED lamp 10, the driving of the optocoupler 8 and the display of the electric quantity of the battery 3.

The software of the product mainly comprises two parts, namely driving software and upper computer software.

The driving software mainly collects signals provided by the Bluetooth module 6 and controls the relay 9 and the LED lamp 10 to act; collecting the electric quantity of the battery 3, and driving the nixie tube 11 to display; and collecting signals of the optical coupler 8, and driving the LED lamp 10 and the buzzer 7 to work.

The upper computer software mainly sends control commands to the RAM chip through Bluetooth wireless communication by operating buttons of a mobile phone WeChat applet.

When the analog circuit is utilized to simulate the ground fault and the direct current channeling fault of the direct current systems of the transformer substation and the power plant, firstly, the command unit is programmed with driving software to enable the command unit to work normally, then the core board and the main control board are connected through the connector, and are controlled and collected through the connector, and then a WeChat applet is opened and connected with the Bluetooth number of the equipment, and an AC/DC power supply is used to access the binding post; the micro-communication applet controls the positive and negative poles of different branches through Bluetooth, and the relays of 40K or 20K resistors are turned on or off, and the relay indicator lamps of the corresponding channels are also turned on.

Thus, the positive electrode or the negative electrode of the 1-6 branch lines are connected to the ground through 40K and 20K resistors respectively. The problem of the grounding resistance of the direct current system of the transformer substation and the power plant is simulated, and at the moment, the detection equipment can be connected in for fault detection of direct current grounding.

When a WeChat applet is used for clicking the positive pole or the negative pole of direct current mutual channeling, the two sections of buses are short-circuited through a relay. In this way, the short circuit of the output ends of the two generators of the transformer substation or the power plant is simulated, and direct current channeling is caused. At the moment, the detection equipment can be used for detecting the fault of direct current channeling.

The utility model mainly simulates the fault phenomenon that the direct current grounding of the transformer substation and the power plant and the direct current channeling of the two paths of generators are generated, can be used for checking and accepting fault detection equipment of a matched supplier, solves the problem that a complex checking and accepting environment needs to be built in the past checking and accepting process, and provides training teaching materials for personnel training of the transformer substation and the power plant.

The direct current system grounding and looped network fault simulation circuit provides an equipment debugging environment for suppliers providing detection equipment for substations and power plants, and greatly improves the research and development period and the research and development cost of the detection equipment.

It is easy to understand by those skilled in the art that the above preferred embodiments can be freely combined and overlapped without conflict.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims (10)

1. A direct current system ground and ring network fault simulation circuit, comprising:

a first alternating current-to-direct current power supply (2) and a second alternating current-to-direct current power supply (12);

an instruction unit (5) powered by the first ac-to-dc power supply (2); and

-a relay (9) electrically coupled to the command unit (5) via at least one connector (13) and to the following branches, respectively:

the positive branch of the second alternating current-to-direct current power supply (12);

a negative branch of the second alternating current-to-direct current power supply (12);

a first resistor (R1) is connected to the ground branch;

a second resistor (R2) ground branch, said first resistor (R1) being larger than said second resistor (R2);

wherein the relay (9) is configured to simulate direct current grounding or direct current cross-over detection with one or more of the positive branch, the negative branch, the first resistor (R1) ground branch, and the second resistor (R2) ground branch in response to a control operation of the instruction unit (5).

2. The direct current system grounding and ring network fault simulation circuit according to claim 1, characterized in that the first alternating current-to-direct current power supply (2) is coupled to a battery (3) and adapted to charge the battery (3), and that the battery (3) is coupled to a secondary power supply (4) via a boat-type switch (14) to supply power to the secondary power supply (4) when the boat-type switch (14) is closed.

3. The direct current system grounding and ring network fault simulation circuit according to claim 2, further comprising a bluetooth module (6), the bluetooth module (6) being coupled to the secondary power source (4) and communicatively coupled to the instruction unit (5) for sending control signals to the instruction unit (5).

4. A direct current system grounding and ring network failure simulation circuit according to claim 3, characterized in that the bluetooth module (6) is connected to a terminal and adapted to send the control signal to the instruction unit (5) under control of the terminal.

5. The direct current system grounding and ring network fault simulation circuit according to claim 1, further comprising a buzzer (7), the buzzer (7) being communicatively coupled to the instruction unit (5) to sound an alarm when at least one of a direct current grounding or a direct current cross-over detection is detected.

6. The direct current system grounding and ring network fault simulation circuit according to claim 1, further comprising an optocoupler (8), the optocoupler (8) being electrically coupled to the command unit (5) via at least one connector (13) and to the following branches, respectively:

the positive branch of the second alternating current-to-direct current power supply (12);

and a negative branch of the second alternating current-to-direct current power supply (12).

7. The direct current system grounding and ring network fault simulation circuit according to claim 1, further comprising an LED lamp (10), the LED lamp (10) being electrically coupled to the instruction unit (5) via at least one connector (13).

8. The direct current system grounding and ring network fault simulation circuit according to claim 1, further comprising a nixie tube (11), the nixie tube (11) being electrically coupled to the instruction unit (5) via at least one connector (13).

9. The dc system ground and ring network fault simulation circuit according to claim 1, wherein the first resistor (R1) is 40K and the second resistor (R2) is 20K.

10. Direct current system grounding and ring network fault simulation circuit according to claim 1, characterized in that the instruction unit (5) is a RAM chip.