CN115389926A - Intelligent power distribution switch automatic fault self-healing capability detection device - Google Patents

Abstract

The invention relates to a detection device for automatic fault self-healing ability of an intelligent power distribution switch, which includes a DC input terminal and an inverter connected to each other. The three-phase AC output terminal of the inverter is divided into a current control branch and a voltage control branch. The current control branch includes a voltage regulator connected in series, a three-phase ammeter, a current adding button, a current control programmable time relay and a primary current transformer. The two ends of the secondary winding of the primary current transformer are respectively connected to the three-phase The output terminal and the three-phase output terminal on the load side; the voltage control branch includes a voltage loss button connected in parallel, a three-phase voltmeter and a voltage transformer, and a voltage control programmable time relay is connected in series on the low-voltage winding side circuit of the voltage transformer. Compared with the prior art, the present invention has the advantages of convenient operation, no need for cooperation of multiple types of work, ability to test switch intelligent self-healing faults, use of discarded transformer equipment, and low cost.

Description

A detection device for automatic fault self-healing ability of intelligent power distribution switch

technical field

The invention relates to the field of electric equipment, in particular to a detection device for the automatic fault self-healing ability of an intelligent power distribution switch.

Background technique

The intelligent power distribution switch has powerful automation functions, which can realize multiple different types of reclosing, realize automatic isolation and recovery of distribution network faults, isolate the unrecoverable sections to the minimum range, and automatically collect analog quantities, relay protection, and open circuits. The primary and secondary equipment such as arc extinguishing mechanism and other equipment are integrated into one body, so there are many new requirements for the testing of intelligent power distribution switches. And because the intelligent power distribution switches are installed scatteredly on the branch line poles of the distribution network, it is difficult to conduct experiments on their characteristics, especially the test of automatic fault self-healing ability, and there is almost no power failure verification for the intelligent power distribution switches of important circuits. Or the method and habit of live detection. Therefore, if a device that can conveniently inspect the operating conditions of the intelligent distribution switch can be developed, it will help greatly improve the reliability of the distribution network operation.

The existing technology generally adopts a tripping scheme based on a large current generator. However, this scheme has the following disadvantages. First, it is inconvenient to use. A large number of intelligent power distribution switches are installed in a large number, and the high current generator is very heavy. A 1000A high current generator is heavy. It can reach more than 30 kilograms, which brings great inconvenience to the mobile detection operation on site. In addition, the existing high-current generators are single-phase output for the convenience of power supply. For the three-phase intelligent power distribution switch, it needs to be tested three times, which is even more The inconvenience of work. Secondly, it is impossible to simulate the real load current change process, and finally, the cost is relatively high. The existing technology is based on the large current generator design switch automatic fault self-healing ability detection device, which requires a large-capacity primary current transformer and auto-coupling voltage regulator. , because they are all power frequency single-phase inductive components, which consume a lot of copper and iron, and the cost is high. The line can trip after power failure. Because the battery capacity inside the smart switch is very small, it often encounters the problem that it cannot trip after power failure. If there is equipment that can easily test its automatic fault self-healing ability, it will greatly prevent intelligent power distribution. Potential hazards of the switch.

Contents of the invention

The purpose of the present invention is to provide a detection device for automatic fault self-healing ability of intelligent power distribution switch in order to overcome the defects of the above-mentioned prior art, which has the advantages of convenient operation, no need for multi-work cooperation, simultaneous testing of three phases, and use of scrapped transformers. Advantages of equipment and low cost.

The purpose of the present invention can be achieved through the following technical solutions:

A detection device for automatic fault self-healing ability of an intelligent power distribution switch, including a DC input terminal and an inverter connected to each other, and the three-phase AC output terminal of the inverter is divided into a current control branch and a voltage control branch. The current control branch includes a voltage regulator connected in series, a three-phase ammeter, a current adding button, a current control programmable time relay and a current transformer, and one end of the primary winding of the primary current transformer is connected to a current control programmable time The other end of the relay is grounded; the two ends of the secondary winding of the primary current transformer are respectively connected to the three-phase output end of the power supply side and the three-phase output end of the load side; in the zero-phase circuit of the three-phase output end of the voltage regulator A secondary current transformer and an electric signal timer are also connected in series, the primary winding of the secondary current transformer is connected to the zero-phase circuit of the three-phase output terminal of the voltage regulator, and the secondary winding of the secondary current transformer connected to the signal input end of the electrical signal timer;

The voltage control branch includes a voltage loss button, a three-phase voltmeter and a voltage transformer, the low-voltage windings of the three-phase voltmeter and the voltage transformer are connected in parallel with the voltage loss button, and the low-voltage winding side circuit of the voltage transformer A voltage control programmable time relay is also connected in series, the common ends of the high voltage windings of the voltage transformers are connected to each other to form a zero phase, and the phase line ends are respectively connected to the corresponding three-phase output ends on the power supply side.

Further, the device further includes a memory alloy current limiter, and the memory alloy current limiter is connected in series with the three-phase output terminal on the power supply side.

Further, the memory alloy current limiter is helically wound side by side with reversible temperature sudden change memory alloy wires.

Further, the current control branch and the voltage control branch are both three-phase lines, and the voltage loss button, voltage regulator, three-phase ammeter, three-phase voltmeter, primary current transformer, voltage transformer, power supply side Both the three-phase output terminals and the load-side three-phase output terminals are three.

Further, the device converts the power supply at the DC input terminal into AC voltage through the inverter, and after setting different voltages through the three-phase voltage regulator, the primary current transformer is reversed to realize current amplification, thereby realizing intelligent power distribution Generation of switching three-phase test current.

Further, the device converts the power supply at the DC input terminal into AC voltage through an inverter, and forms a three-phase test voltage of an intelligent power distribution switch after a voltage loss button and a voltage transformer reverse connection boost.

Further, the device realizes the application of current and voltage in various time sequences through three sets of voltage-controlled programmable time relays and three sets of current-controlled programmable time relays, thereby verifying whether the switch can automatically identify fault types in real scenarios. Multiple reclosures.

Further, the device detects the inconsistency of the three phases or the state of reduced arc extinguishing capability through the electrical signal timer.

Further, the three-phase output terminals on the power supply side and the three-phase output terminals on the load side are used to be connected to both sides of the three-phase fracture of the intelligent power distribution switch under test.

Further, the DC input end is a DC low-voltage power supply.

Compared with the prior art, the present invention has the following advantages:

(1) The cost is low, and the price is only about one-third of the prior art. There are a large number of discarded current and voltage transformers that are close to the service life in electric power enterprises. The present invention skillfully utilizes the above idle equipment to realize the functions of step-up transformers and step-up transformers. The cost is less than one third of the prior art, and fully utilizes In order to scrap idle equipment, it plays a prominent role in resource recycling and turning waste into treasure.

(2) It fills the problem of detecting the real fault self-healing ability of the intelligent power distribution switch, and can detect the intelligent self-healing ability of the switch at the same time for three phases. The present invention adopts the inverter to realize the output current regulation. Since the inverter has the innate AC-DC-AC conversion function, the common single-phase power supply can be used to generate the three-phase detection current to realize the three-phase simultaneous detection of the three-phase switch, through Three sets of programmable time relays can directly realize the application of current and voltage in various sequences, so as to verify whether the switch can automatically identify the fault type 2 and automatically reclose multiple times in the real scene, which greatly improves the efficiency of on-site detection operations.

(3) No pole test is required. The relay protection test of the intelligent power distribution switch must climb the pole, but the general secondary professionals do not have the ability to work at heights, and the maintenance personnel who have the ability to work at heights do not have the professional knowledge of secondary control and protection equipment, which makes The on-site detection of intelligent power distribution switches requires the cooperation of multiple types of work, and the operation efficiency is very low. However, the number of intelligent power distribution switches is extremely large, which leads to many power supply departments often having no time to check all circuit breakers in their jurisdiction on schedule, causing hidden dangers to future operations. The invention only needs to connect six test rods to conveniently test the intelligent power distribution switch on the ground, further improving the efficiency of on-site operations.

(4) It can detect the real arc extinguishing ability and three-phase synchronous characteristics of the switch. The present invention cleverly utilizes the capability of simultaneous detection of three phases, and detects the synchronism of three-phase actions through the timing of zero-phase current, and fundamentally finds the hidden danger of three-phase inconsistency that may exist in the switch.

(5) The primary item and the secondary item can be detected at the same time. The invention can detect the action time limit of the circuit breaker and the three-phase synchronization through the primary side injection flow, and can also detect the accuracy of the relay protection action, and realizes the ability of primary and secondary functions to be detected at the same time, which is not to mention the improvement of operating efficiency And metaphor.

(6) It can directly detect the switch's low-voltage power-off tripping capability. The smart switch also needs a perfect low-voltage tripping function, that is, it can trip after the line loses power. Because the battery capacity inside the smart switch is very small, it often encounters the problem of not being able to trip after a power failure. If there is equipment, it can easily test its automatic fault. The self-healing ability will greatly prevent potential hidden dangers of intelligent power distribution switches.

Description of drawings

Fig. 1 is a schematic structural diagram of an automatic fault self-healing capability detection device for an intelligent power distribution switch provided in an embodiment of the present invention;

In the figure, 1. Inverter, 2. Voltage regulator, 3. Primary current transformer, 4. Electric signal timer, 5. Secondary current transformer, 6. Three-phase ammeter, 7. Voltage transformer, 8 , Three-phase voltmeter, 10. Three-phase output terminal on the power supply side, 11. Three-phase output terminal on the load side, 12. DC input terminal, 13. Current adding button, 14. Voltage loss button, 15. Memory alloy current limiter, 16. Voltage control programmable time relay, 17. Current control programmable time relay.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention.

It should be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is absolutely level or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

The invention provides a detection device for the automatic fault self-healing ability of an intelligent power distribution switch, which includes a DC input terminal 12 and an inverter 1 connected to each other. The three-phase AC output terminal of the inverter 1 is divided into a current control branch and a voltage control branch. Branch, the current control branch includes a voltage regulator 2 connected in series, a three-phase ammeter 6, a current adding button 13, a current control programmable time relay 17 and a primary current transformer 3, one end of the primary winding of the primary current transformer 3 Connect the current control programmable time relay 17, and the other end is grounded; the two ends of the secondary winding of the primary current transformer 3 are respectively connected to the three-phase output terminal 10 on the power supply side and the three-phase output terminal 11 on the load side; the three-phase output terminal 11 of the voltage regulator 2 A secondary current transformer 5 and an electrical signal timer 4 are also connected in series in the zero-phase loop at the phase output end, the primary side winding of the secondary current transformer 5 is connected to the zero-phase loop at the three-phase output end of the voltage regulator 2, and the secondary current mutual inductance The secondary winding of the device 5 is connected to the signal input end of the electrical signal timer 4;

The voltage control branch includes a voltage loss button 14, a three-phase voltmeter 8 and a voltage transformer 7, the low-voltage windings of the three-phase voltmeter 8 and the voltage transformer 7 are connected in parallel with the voltage loss button 14, and the low-voltage winding side circuit of the voltage transformer 7 There is also a voltage control programmable time relay 16 in series, the common ends of the high voltage windings of the voltage transformer 7 are connected to each other to form a zero phase, and the phase line ends are respectively connected to the corresponding three-phase output ends 10 on the power supply side.

As a preferred embodiment, the device also includes a memory alloy current limiter 15, which is connected in series with the three-phase output terminal 10 on the power supply side. closely wound side by side. Through the current limitation of the memory alloy, the memory alloy wire is heated and deformed when the switch is operated with a large current during the test, and the resistance of the ring-shaped memory alloy wire is greatly increased, which can effectively avoid the contact damage of the switch during multiple overlaps and fault currents.

Both the current control branch and the voltage control branch are three-phase lines, the voltage loss button 14, the voltage regulator 2, the three-phase ammeter 6, the three-phase voltmeter 8, the primary current transformer 3, the voltage transformer 7, and the power supply side three The number of phase output terminals 10 and the load-side three-phase output terminals 11 are both three.

The device converts the power supply of the DC input terminal 12 into AC voltage through the inverter 1, and after setting different voltages through the three-phase voltage regulator 2, the primary current transformer 3 is reversed to realize current amplification, thereby realizing intelligent power distribution Generation of switching three-phase test current.

The device converts the power supply of the DC input terminal 12 into an AC voltage through the inverter 1, and forms the three-phase test voltage of the intelligent power distribution switch after the voltage loss button 14 is reversed and boosted by the voltage transformer 7.

The device uses three sets of voltage-controlled programmable time relays 16 and three sets of current-controlled programmable time relays 17 and 17 to realize multiple sequential current and voltage applications, thereby verifying whether the switch can automatically identify the fault type 2 and automatically reclose multiple times in a real scene. brake.

The device detects the inconsistency of the three phases or the state of reduced arc extinguishing ability through the electrical signal timer 4.

Example 1

Referring to accompanying drawing 1, it is the schematic diagram of the embodiment of the present invention, comprises inverter 1, voltage regulator 2, primary current transformer 3, electrical signal timer 4, secondary current transformer 5, three-phase ammeter 6, voltage Transformer 7, three-phase voltmeter 8, power supply side three-phase output terminal 10, load side three-phase output terminal 11, DC input terminal 12, current adding button 13, voltage loss button 14;

The DC power input terminal of the inverter 1 is connected to the DC input terminal 12, and the three-phase AC output terminal is divided into two circuits, one of which is connected to the input terminal of the voltage regulator 2, and the other is connected to the voltage loss button 14; the three-phase output of the voltage regulator 2 The three-phase ammeter 6 and the current adding button 13 are connected in series with the primary winding of the primary current transformer 3 respectively, and the three-phase secondary winding of the primary current transformer 3 is connected with the three-phase output terminal 10 on the power supply side and the three-phase winding on the load side. The output terminal 11 is connected, and the zero-phase circuit of the three-phase output terminal of the voltage regulator 2 is also connected in series with the primary winding of the secondary current transformer 5, the secondary winding of the secondary current transformer 5 and the signal input terminal of the electrical signal timer 4 connected. The three-phase voltage loss button 14 is also connected in parallel with the low-voltage winding of the three-phase voltage transformer 7 and the three-phase voltmeter 8; The output terminal 10 is connected. The three-phase voltage transformer 7 is three independent single-phase voltage transformers; the primary current transformer 3 is three independent single-phase current transformers.

The principle of the present invention is also to use a large current to trip the tested intelligent power distribution switch, and then detect whether its various action characteristics meet the requirements, but the implementation method has many similarities and differences with the prior art, thus obtaining more prominent beneficial effects.

First of all, the present invention utilizes a large number of discarded current and voltage transformers close to the service life in the electric power enterprise, skillfully utilizes the above-mentioned idle equipment, realizes the effect of the step-up transformer and the step-up transformer, and converts the DC low-voltage power supply, such as the maintenance vehicle, through the inverter. The 12V battery is transformed into a higher AC voltage. After setting different voltages through the three-phase voltage regulator, the current transformer is reversed to realize the current amplification, thereby realizing the generation of the three-phase test current of the intelligent power distribution switch; intelligent power distribution The switch protection has low voltage requirements, and only needs to verify that the low-voltage trip can be managed. Therefore, the three-phase voltage does not use a voltage regulator to adjust the voltage, but directly passes the normally closed contact button, and after the voltage transformer is reversed and boosted, an intelligent power distribution is formed. The three-phase test voltage of the switch. In addition, the intelligent self-healing ability of the programmable time relay and the three-phase simultaneous detection switch can be further adopted.

The present invention adopts the inverter to realize the output current regulation. Since the inverter has the innate AC-DC-AC conversion function, the common single-phase power supply can be used to generate the three-phase detection current to realize the three-phase simultaneous detection of the three-phase switch, through Three sets of programmable time relays can directly realize the application of current and voltage in various sequences, so as to verify whether the switch can automatically identify the fault type 2 and automatically reclose multiple times in the real scene, which greatly improves the efficiency of on-site detection operations. Since the test current and voltage are both high-voltage signals injected from the primary side, it is guaranteed that the primary and secondary equipment are subjected to the experiment at the same time, realizing the overall nature and high efficiency of the experiment, and making full use of the scrapped idle equipment to achieve resource recycling, The outstanding effect of turning waste into wealth.

The present invention adopts the memory alloy current limiter, through the current limit of the memory alloy, the memory alloy wire is heated and deformed when the large current is applied during the test, and the resistance of the ring-shaped memory alloy wire is greatly increased, which can effectively prevent the switch from overlapping repeatedly. Contact damage during fault current.

Secondly, the present invention realizes the detection of the zero-phase current by constructing a three-phase detection circuit, and through the timing of the zero-phase electrical signal timer, it can sensitively reflect the problem of arc extinction or the problem of three-phase inconsistency. If the synchronism is good, there will be an unbalanced current in the zero phase for a short time. If a certain phase moves slowly or the arc extinguishing ability is reduced, there will be an unbalanced current in the zero phase for a long time, so that through the electrical signal timer It can intuitively and obviously detect the problem of three-phase inconsistency or the reduction of arc extinguishing ability. The invention is also very convenient to use, and only needs to hang six three-phase signal output terminals on both sides of the three-phase fracture of the tested intelligent power distribution switch.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (10)

1. The device for detecting the automatic fault self-healing capability of the intelligent distribution switch is characterized by comprising a direct current input end (12) and an inverter (1) which are connected with each other, wherein a three-phase alternating current output end of the inverter (1) is divided into a current control branch and a voltage control branch, the current control branch comprises a voltage regulator (2), a three-phase ammeter (6), a current adding button (13), a current control programmable time relay (17) and a primary current transformer (3) which are connected in series, one end of a primary winding of the primary current transformer (3) is connected with the current control programmable time relay (17), and the other end of the primary winding is grounded; two ends of a secondary winding of the primary current transformer (3) are respectively connected with a power side three-phase output end (10) and a load side three-phase output end (11); a secondary current transformer (5) and an electric signal timer (4) are also connected in series in a zero-phase loop of the three-phase output end of the voltage regulator (2), a primary winding of the secondary current transformer (5) is connected with the zero-phase loop of the three-phase output end of the voltage regulator (2), and a secondary winding of the secondary current transformer (5) is connected with a signal input end of the electric signal timer (4);

the voltage control branch circuit comprises a no-voltage button (14), a three-phase voltmeter (8) and a voltage transformer (7), low-voltage windings of the three-phase voltmeter (8) and the voltage transformer (7) are connected with the no-voltage button (14) in parallel, a voltage control programmable time relay (16) is further connected in series in a low-voltage winding side circuit of the voltage transformer (7), a common end of a high-voltage winding of the voltage transformer (7) is connected into a zero phase, and a phase end is connected with a corresponding power side three-phase output end (10) respectively.

2. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 1, wherein the device further comprises a memory alloy current limiter (15), and the memory alloy current limiter (15) is connected in series with the power supply side three-phase output end (10).

3. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 2, wherein the memory alloy current limiter (15) is formed by spirally winding a reversible memory alloy wire with a temperature jump side by side in a tight manner.

4. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 1, wherein the current control branch and the voltage control branch are three-phase lines, and the number of the no-voltage button (14), the voltage regulator (2), the three-phase ammeter (6), the three-phase voltmeter (8), the primary current transformer (3), the voltage transformer (7), the power side three-phase output end (10) and the load side three-phase output end (11) is three.

5. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 1, wherein the device converts a power supply at a direct current input end (12) into an alternating current voltage through an inverter (1), and after different voltages are set through a three-phase voltage regulator (2), a primary current transformer (3) is connected in a reverse mode to amplify the current, so that three-phase test current of the intelligent power distribution switch is generated.

6. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 1, wherein the device converts a power supply at a direct current input end (12) into an alternating current voltage through the inverter (1), and the three-phase test voltage of the intelligent power distribution switch is formed after the alternating current voltage passes through a no-voltage button (14) and is reversely connected and boosted through a voltage transformer (7).

7. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 1, wherein the device realizes current and voltage application of various time sequences through three groups of voltage control programmable time relays (16) and three groups of current control programmable time relays (17), so as to verify whether a fault type can be automatically identified under a real scene of the switch or not through automatic multiple reclosure.

8. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 1, wherein the device detects a three-phase inconsistency or a reduced arc extinguishing capability state through an electric signal timer (4).

9. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 1, wherein the power side three-phase output end (10) and the load side three-phase output end (11) are used for being hung on two sides of a three-phase fracture of the tested intelligent power distribution switch.

10. The automatic fault self-healing capability detection device for the intelligent power distribution switch according to claim 1, wherein the dc input terminal (12) is a dc low-voltage power supply.

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