CN211908354U

CN211908354U - Forced tripping circuit structure and forced tripping box for alternating current fault of direct current system

Info

Publication number: CN211908354U
Application number: CN202020978487.1U
Authority: CN
Inventors: 南春燕; 詹昆利
Original assignee: Huangshi Thermal Power Branch Of Huadian Hubei Power Generation Co ltd
Current assignee: Huangshi Thermal Power Branch Of Huadian Hubei Power Generation Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-11-10
Anticipated expiration: 2030-06-02

Abstract

The utility model discloses a jump circuit structure and jump box compel of direct current system alternating current scurrying electric fault, wherein, direct current system alternating current scurrying electric fault compel jump circuit structure include binding post XT +, XT-and XT0, contactor KM1 and KM2, auxiliary relay KA1 and KA2, diode D1 and D2, current limiting resistor R, and aviation plug XH; the utility model provides an among the technical scheme, through binding post XT +, XT-and XT0, contactor KM1 and KM2, auxiliary relay KA1 and KA2, diode D1 and D2, current limiting resistor R, and the circuit structure who connects between the aviation plug XH, when having the alternating current to scurry into DC system and exceed the definite value, pass through its auxiliary relay of aviation plug drive with the hard node mode immediately, again by auxiliary relay drive contactor, short circuit alternating current scurry electric fault DC bus and earth's network, produce short-circuit current and force the switch dropout tripping operation on the trouble branch road, thereby realize that DC system alternating current scurries the automatic treatment of electric fault.

Description

Forced tripping circuit structure and forced tripping box for alternating current fault of direct current system

Technical Field

The utility model relates to an electric power system DC power supply scurries detection technical field, in particular to direct current system alternating current scurries compel circuit structure and compel the case of jumping of electric fault.

Background

The electric power is an important branch of national economic development and civil stability, the safe operation of a power plant is particularly important, and the loss of consequences caused by each accident is immeasurable. The reliable direct current power supply is indispensable in the power plant, provides control, protection and signal power supply for power equipment, and also supplies power for loads such as a direct current motor, emergency lighting and a UPS (uninterrupted power supply), so that the operation safety of the power plant is ensured.

A dc system ground fault in an electric power system is a fault that is prone to occur and is more harmful to the electric power system. However, the ac crosstalk fault in the dc system is the most serious grounding condition in the dc system, and when the ac crosstalk fault occurs in the dc system, the malfunction of protection is likely to be caused, which is a serious hazard.

According to the latest safety regulations of the direct current system, when an alternating current power leakage fault occurs in the direct current system, the direct current insulation monitoring device needs to send out an alarm signal in time and record the time of the fault occurrence. However, the fault that alternating current is connected in series with a direct current system is eliminated, manual on-site pulling operation is still needed, the real-time performance is poor, the potential safety hazard is high, and the safety of the direct current system is damaged.

Disclosure of Invention

The utility model aims at providing a direct current system alternating current scurries compelling to jump circuit structure of electric fault aims at solving current alternating current cluster and goes into direct current system fault and still need artifical scene to draw the way operation, and the real-time is poor, and the potential safety hazard is many, endangers direct current system's safe problem.

In order to achieve the purpose, the utility model provides a forced-tripping circuit structure of direct current system alternating current fault, including binding post XT +, XT-and XT0, contactors KM1 and KM2, auxiliary relays KA1 and KA2, diodes D1 and D2, current-limiting resistor R, and aviation plug XH, contactor KM1 and KM2, its coil all has 2 binding posts, KM1-A1, KM1-A2, and KM2-A1, KM2-A2, one end of contactor KM1 main contact links to each other with binding post XT +, one end of contactor KM2 main contact links to each other with binding post XT-, binding post KM1-A2 and KM2-A2 all link to the working power supply negative pole; the intermediate relays KA1 and KA2 are respectively provided with 6 connecting terminals, namely KA1-1, KA1-2, KA1-3, KA1-4, KA1-5 and KA1-6, KA2-1, KA2-2, KA2-3, KA2-4, KA2-5 and KA2-6, the connecting terminals KA1-6 and KA2-6 are respectively connected with the connecting terminal XT +, the connecting terminal KA1-5 is connected with the connecting terminal KM1-A1 through a KM2 normally closed auxiliary contact, the connecting terminal KA2-5 is connected with the connecting terminal KM2-A1 through a KM1 normally closed auxiliary contact, the connecting terminals KA 1-KA 3 and KA2-3 are both connected with the negative electrode of a working power supply, and the connecting terminals KA1-1, KA1-2, KA2-1 and 2-2 are all suspended for standby; the diodes D1 and D2 both have a positive end and a negative end which are respectively D1 +, D1-, D2 + and D2-, the D1-end is connected with the other end of the main contact of the contactor KM1, and the D2 + end is connected with the other end of the main contact of the contactor KM 2; one end of the current-limiting resistor R is connected with a line formed by connecting a D1 + end and a D2-end of a diode in parallel, and the other end of the current-limiting resistor R is connected with a wiring terminal XT 0; the aviation plug XH is provided with 4 connecting terminals, namely XH-1, XH-2, XH-3 and XH-4, wherein the connecting terminals XH-1 and XH-2 are connected with the anode of a working power supply, the connecting terminal XH-3 is connected with the connecting terminal KA1-4 of the intermediate relay, and the connecting terminal XH-4 is connected with the connecting terminal KA2-4 of the intermediate relay.

The utility model also provides a jump case compels of direct current system alternating current scurrying electric fault, jump circuit structure compels including foretell direct current system alternating current scurrying electric fault, compels the binding post XT + of jumping the case and is connected with direct current power supply positive bus, binding post XT-is connected with direct current power supply branch generating line, XT0 links to each other with the electric wire netting, aviation plug XH external direct current system insulation detection device.

The utility model provides an among the technical scheme, through binding post XT +, XT-and XT0, contactor KM1 and KM2, auxiliary relay KA1 and KA2, diode D1 and D2, current limiting resistor R, and the circuit structure who connects between the aviation plug XH, when having the alternating current to scurry into DC system and exceed the definite value, pass through its auxiliary relay of aviation plug drive with the hard node mode immediately, again by auxiliary relay drive contactor, short circuit alternating current scurry electric fault DC bus and earth's network, produce short-circuit current and force the switch dropout tripping operation on the trouble branch road, thereby realize that DC system alternating current scurries the automatic treatment of electric fault.

Compared with the prior art, the forced-tripping circuit structure of the alternating current channeling fault of the direct current system has the following advantages:

(1) the method and the device realize the on-line automatic management of the alternating current and the current channeling faults of the direct current system and make up the defect that the conventional direct current system insulation monitoring device can only monitor and cannot manage.

(2) The forced jumping box has the advantages of simple principle, low cost, strong practicability and capability of being matched with a direct current system insulation monitoring device for use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a forced trip circuit structure for an ac current fleeing fault of a dc system according to the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

The utility model provides a direct current system alternating current scurries compelling circuit structure that jumps electric trouble, figure 1 is the utility model provides a direct current system alternating current scurries schematic diagram of a compelling circuit structure embodiment of electric trouble.

Referring to fig. 1, the jump circuit structure for the alternating current fault of the direct current system comprises connecting terminals XT +, XT-and XT0, contactors KM1 and KM2, intermediate relays KA1 and KA2, diodes D1 and D2, a current-limiting resistor R, and an aviation plug XH, wherein the contactors KM1 and KM2 respectively have 2 connecting terminals in coils, namely, KM1-a1, KM1-a2, KM2-a1, KM2-a2, one end of a main contact of the contactor KM1 is connected with the connecting terminal XT +, one end of a main contact of the contactor KM2 is connected with the connecting terminal XT-, and the connecting terminals KM1-a2 and KM2-a2 are connected with the negative pole of a working power supply; the intermediate relays KA1 and KA2 are respectively provided with 6 connecting terminals, namely KA1-1, KA1-2, KA1-3, KA1-4, KA1-5 and KA1-6, KA2-1, KA2-2, KA2-3, KA2-4, KA2-5 and KA2-6, the connecting terminals KA1-6 and KA2-6 are respectively connected with the connecting terminal XT +, the connecting terminal KA1-5 is connected with the connecting terminal KM1-A1 through a KM2 normally closed auxiliary contact, the connecting terminal KA2-5 is connected with the connecting terminal KM2-A1 through a KM1 normally closed auxiliary contact, the connecting terminals KA 1-KA 3 and KA2-3 are both connected with the negative electrode of a working power supply, and the connecting terminals KA1-1, KA1-2, KA2-1 and 2-2 are all suspended for standby; the diodes D1 and D2 both have a positive end and a negative end which are respectively D1 +, D1-, D2 + and D2-, the D1-end is connected with the other end of the main contact of the contactor KM1, and the D2 + end is connected with the other end of the main contact of the contactor KM 2; one end of the current-limiting resistor R is connected with a line formed by connecting a D1 + end and a D2-end of a diode in parallel, and the other end of the current-limiting resistor R is connected with a wiring terminal XT 0; the aviation plug XH is provided with 4 connecting terminals, namely XH-1, XH-2, XH-3 and XH-4, wherein the connecting terminals XH-1 and XH-2 are connected with the anode of a working power supply, the connecting terminal XH-3 is connected with the connecting terminal KA1-4 of the intermediate relay, and the connecting terminal XH-4 is connected with the connecting terminal KA2-4 of the intermediate relay.

The utility model provides a jump case compels of direct current system alternating current scurrying electric fault, the circuit structure is compeled to jump including foretell direct current system alternating current scurrying electric fault compels to jump, compels to jump the binding post XT + of case and direct current power supply positive bus connection, binding post XT-is connected with direct current power supply branch generating line, XT0 links to each other with the electric wire netting, aviation plug XH external direct current system insulation detection device.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A forced-tripping circuit structure for an Alternating Current (AC) power-on fault of a DC system is characterized in that: comprises wiring terminals XT +, XT-and XT0, contactors KM1 and KM2, intermediate relays KA1 and KA2, diodes D1 and D2, a current-limiting resistor R, and an aviation plug XH,

the coils of the contactors KM1 and KM2 are respectively provided with 2 connecting terminals, namely KM1-A1, KM1-A2, KM2-A1 and KM2-A2, one end of a main contact of the contactor KM1 is connected with a connecting terminal XT +, one end of a main contact of the contactor KM2 is connected with the connecting terminal XT-, and the connecting terminals KM1-A2 and KM2-A2 are both connected with the negative electrode of a working power supply;

the intermediate relays KA1 and KA2 are respectively provided with 6 connecting terminals, namely KA1-1, KA1-2, KA1-3, KA1-4, KA1-5 and KA1-6, KA2-1, KA2-2, KA2-3, KA2-4, KA2-5 and KA2-6, the connecting terminals KA1-6 and KA2-6 are respectively connected with the connecting terminal XT +, the connecting terminal KA1-5 is connected with the connecting terminal KM1-A1 through a KM2 normally closed auxiliary contact, the connecting terminal KA2-5 is connected with the connecting terminal KM2-A1 through a KM1 normally closed auxiliary contact, the connecting terminals KA 1-KA 3 and KA2-3 are both connected with the negative electrode of a working power supply, and the connecting terminals KA1-1, KA1-2, KA2-1 and 2-2 are all suspended for standby;

the diodes D1 and D2 both have a positive end and a negative end which are respectively D1 +, D1-, D2 + and D2-, the D1-end is connected with the other end of the main contact of the contactor KM1, and the D2 + end is connected with the other end of the main contact of the contactor KM 2;

one end of the current-limiting resistor R is connected with a line formed by connecting a D1 + end and a D2-end of a diode in parallel, and the other end of the current-limiting resistor R is connected with a wiring terminal XT 0;

the aviation plug XH is provided with 4 connecting terminals, namely XH-1, XH-2, XH-3 and XH-4, wherein the connecting terminals XH-1 and XH-2 are connected with the anode of a working power supply, the connecting terminal XH-3 is connected with the connecting terminal KA1-4 of the intermediate relay, and the connecting terminal XH-4 is connected with the connecting terminal KA2-4 of the intermediate relay.

2. The utility model provides a forced tripping box of direct current system alternating current leap electric fault which characterized in that: the jump-forcing circuit structure comprises the direct current system alternating current fault forcing circuit structure as claimed in claim 1, wherein a connection terminal XT + of a jump-forcing box is connected with a direct current power supply positive bus, a connection terminal XT-is connected with a direct current power supply branch bus, XT0 is connected with a power grid, and an aviation plug XH is externally connected with a direct current system insulation detection device.