CN210536280U - Generator stator ground protection device - Google Patents

Abstract

The utility model discloses a generator stator grounding protection device, which comprises a neutral line and a cabinet body, lifting lugs are fixed at four corners of the upper end face of the cabinet body, a partition board is fixed at the middle part inside the cabinet body, a grounding transformer and a winding resistor are respectively fixed on two sides of the upper end surface of the clapboard, a hanging box is fixed in the middle of the lower end surface of the clapboard, a current transformer is fixed in the hanging box, a grounding pile and a square wave power supply are fixed at the bottom end in the cabinet body, the grounding pile is connected with the lower end of the outer side of the cabinet body through an external wire, the neutral wire is arranged on one side of the upper end face of the cabinet body in a penetrating way, the neutral line is electrically connected with the grounding transformer, the two sides of the opening of the cabinet body are both rotatably provided with cabinet doors through hinges, the lower terminal surface both sides of the cabinet body all are fixed with the callus on the sole, the thermovent has all been seted up to the both sides of the cabinet body and the lower extreme of cabinet door. The utility model discloses possess normal supervision when the unit shut down, all-round guardianship ensures the advantage of power consumption safety.

Description

Generator stator ground protection device

Technical Field

The utility model relates to a ground protection technical field specifically is a generator stator ground protection device.

Background

The generator is mechanical equipment which converts other forms of energy into electric energy, is driven by a water turbine, a steam turbine, a diesel engine or other power machines, converts energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and transmits the mechanical energy to the generator, and then the generator converts the mechanical energy into electric energy.

The generator stator grounding refers to a single-phase grounding short circuit generated by a generator stator winding loop and a primary system directly connected with the stator winding loop. The stator grounding can be divided into instantaneous grounding, intermittent grounding and permanent grounding according to the grounding time; the grounding range can be divided into an internal grounding and an external grounding; according to grounding property, the grounding method can be divided into metallic grounding, arc grounding and resistance grounding; the ground reason can be divided into a true ground and a false ground.

The existing grounding device uses fundamental wave zero sequence voltage type stator grounding protection and stator grounding protection formed by third harmonic voltage in order to carry out no dead zone protection when a generator stator has a grounding fault and ensure hundred percent effectiveness, but the protection mode cannot monitor when a unit is shut down and has a monitoring blind zone, so that the existing grounding device is inconvenient to use, has a high possibility of releasing the situation that short circuit and leakage cannot be monitored, and brings serious safety accidents.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a generator stator ground protection device possesses the normal monitoring when the unit stops, and the advantage of power consumption safety is ensured in all-round guardianship, solves the problem that existing equipment has the surveillance blind area, has the potential safety hazard.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a generator stator ground protection device, includes the neutral line and the cabinet body, the up end four corners department of the cabinet body all is fixed with the lug, department is fixed with the baffle in the middle of the inside of the cabinet body, the up end both sides of baffle are fixed with earth transformer and wire winding resistance respectively, department is fixed with in the middle of the lower terminal surface of baffle and hangs the box, and hangs the box internal fixation and have current transformer, the inside bottom mounting of the cabinet body has ground connection stake and square wave power supply, ground connection stake passes through the outside lower extreme of the external connection cabinet body, the neutral line runs through and installs in up end one side of the cabinet body, and the neutral line is connected with earth transformer electricity, the opening part both sides of the cabinet body all rotate through the hinge and install the cabinet.

Preferably, foot pads are fixed on two sides of the lower end face of the cabinet body, and heat dissipation ports are formed in two sides of the cabinet body and the lower end of the cabinet door.

Preferably, the winding resistor is connected with a current transformer through a second wire, and the current transformer is connected with a square wave power supply through a first wire.

Preferably, the grounding transformer and the winding resistor are electrically connected through a wire, and the grounding pile and the square wave power supply are electrically connected through a wire.

Preferably, the middle of one side of the cabinet door, which is far away from the hinge, is fixed with a handle, and a mechanical lock is embedded in the cabinet door.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model improves the power supply reliability of a power distribution system by arranging the grounding transformer and the square wave power supply, leads the neutral point of the generator to pass through the neutral line and the grounding transformer of the device, leads the grounding capacitance current when the grounding short circuit fault occurs to the power distribution network through the grounding transformer, reduces the voltage through the winding resistance to ensure the grounding safety, transmits the current to the current transformer through the second lead, the current transformer converts the primary side heavy current into the secondary side small current for monitoring through the electromagnetic induction principle, then the current enters the square wave power supply through the first lead, the square wave power supply collects the voltage and the injection current of the injection power supply, when in normal operation, the injection current is coupled to the generator stator through the grounding, the flowing current is the capacitance current, when the generator stator is grounded, the current is increased, the coupling to the secondary current is also increased, and when the collection injection current is, the device has the advantages that the grounding fault of the stator of the reaction generator is judged, the current is connected to a grounding circuit through the grounding pile and the external line, the structure is simple and convenient, the normal monitoring can be realized when the unit is stopped, and the grounding safety is ensured.

Drawings

Fig. 1 is a schematic view of the structure of the present invention;

fig. 2 is a schematic view of the expanded structure of the present invention;

fig. 3 is a schematic structural diagram of a in fig. 2 according to the present invention;

fig. 4 is a schematic side view of the present invention.

In the figure: 1. a neutral line; 2. a cabinet body; 3. a cabinet door; 4. a foot pad; 5. a heat dissipation port; 6. a handle; 7. lifting lugs; 8. a grounding transformer; 9. a partition plate; 10. grounding piles; 11. external connection; 12. a square wave power supply; 13. winding a resistor; 14. hanging the box; 15. a current transformer; 16. a first conductive line; 17. a second conductive line.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 4, the present invention provides an embodiment: the utility model provides a generator stator ground protection device, including neutral conductor 1 and the cabinet body 2, the lower terminal surface both sides of the cabinet body 2 all are fixed with callus on the sole 4, thermovent 5 has all been seted up to the both sides of the cabinet body 2 and the lower extreme of cabinet door 3, the up end four corners department of the cabinet body 2 all is fixed with lug 7, department is fixed with baffle 9 in the middle of the inside of the cabinet body 2, the up end both sides of baffle 9 are fixed with grounding transformer 8 and winding resistance 13 respectively, department is fixed with in the middle of the lower terminal surface of baffle 9 hangs box 14, and hang 14 internal fixation of box has current transformer 15.

The inside bottom mounting of the cabinet body 2 has ground connection stake 10 and square wave power supply 12, ground connection stake 10 passes through the outside lower extreme that the cabinet body 2 is connected to external connection 11, neutral conductor 1 runs through and installs in the up end one side of the cabinet body 2, and neutral conductor 1 is connected with 8 electricity of grounding transformer, winding resistance 13 is connected with current transformer 15 through second wire 17, current transformer 15 is connected with square wave power supply 12 through first wire 16, grounding transformer 8 and winding resistance 13 pass through wire electric connection, ground connection stake 10 and square wave power supply 12 pass through wire electric connection.

A cabinet door 3 is rotatably installed on two sides of an opening of a cabinet body 2 through hinges, a handle 6 is fixed in the middle of one side of the cabinet door 3, which is far away from the hinges, a mechanical lock is embedded in the cabinet door 3, a neutral point of a generator is connected with a grounding transformer 8 of the device through a neutral line 1, the grounding transformer 8 enables the ground capacitance current of a power distribution network when a ground short circuit fault occurs to improve the power supply reliability of the power distribution system, the voltage of the current is reduced through a winding resistor 13 to ensure the grounding safety, the current is transmitted to a current transformer 15 through a second lead 17, the current transformer 15 converts a large primary side current into a small secondary side current through the electromagnetic induction principle to monitor, the small side current enters a square wave power supply 12 through a first lead 16, the square wave power supply 12 collects the voltage and the injected current of the injected power supply, and the, the current that flows is the electric capacity current, and when generator stator ground connection, the electric current increase, the coupling is also increased to the secondary current, when gathering the injection current increase, judges that response generator stator takes place ground fault, and the electric current is connected to the circuit of ground connection through ground connection stake 10 and external connection 11, and this device structure is simple and convenient, can normally monitor when the unit shuts down, guarantees the ground connection security.

The working principle is as follows: when the utility model works, the neutral point of the generator passes through the neutral line 1 and the grounding transformer 8 of the device, the current reduces the voltage through the winding resistor 13, the grounding safety is ensured, the current is transmitted to the current transformer 15 through the second lead 17, the current transformer 15 converts the large primary side current into the small secondary side current for monitoring through the electromagnetic induction principle, then the small secondary side current enters the square wave power supply 12 through the first lead 16, the square wave power supply 12 collects the voltage and the injection current of the injection power supply, the injection current is coupled and grounded and is transformed to the stator of the generator when the generator normally operates, the flowing current is the capacitance current, when the generator stator is grounded, the current is increased, the coupling secondary current is also increased, when the collected injection current is increased, the grounding fault of the generator stator is judged to occur, and the current is connected to a grounded line through the grounding pile 10 and the external line 11. The working principle of the present invention is the above.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (5)

1. The utility model provides a generator stator ground protection device, includes neutral conductor (1) and cabinet body (2), its characterized in that: lifting lugs (7) are fixed at four corners of the upper end face of the cabinet body (2), a partition plate (9) is fixed at the middle part inside the cabinet body (2), a grounding transformer (8) and a winding resistor (13) are respectively fixed on two sides of the upper end surface of the partition board (9), a hanging box (14) is fixed in the middle of the lower end surface of the partition board (9), a current transformer (15) is fixed in the hanging box (14), a grounding pile (10) and a square wave power supply (12) are fixed at the bottom end in the cabinet body (2), the grounding pile (10) is connected with the lower end of the outer side of the cabinet body (2) through an external wire (11), the neutral line (1) is arranged on one side of the upper end surface of the cabinet body (2) in a penetrating way, and the neutral line (1) is electrically connected with the grounding transformer (8), and the two sides of the opening of the cabinet body (2) are respectively provided with a cabinet door (3) through a hinge in a rotating way.

2. The generator stator ground protection device of claim 1, wherein: foot pads (4) are fixed on two sides of the lower end face of the cabinet body (2), and heat dissipation openings (5) are formed in two sides of the cabinet body (2) and the lower end of the cabinet door (3).

3. The generator stator ground protection device of claim 1, wherein: the winding resistor (13) is connected with a current transformer (15) through a second lead (17), and the current transformer (15) is connected with the square wave power supply (12) through a first lead (16).

4. The generator stator ground protection device of claim 1, wherein: the grounding transformer (8) is electrically connected with the winding resistor (13) through a wire, and the grounding pile (10) is electrically connected with the square wave power supply (12) through a wire.

5. The generator stator ground protection device of claim 1, wherein: the middle of one side of the cabinet door (3) departing from the hinge is fixed with a handle (6), and the cabinet door (3) is embedded with a mechanical lock.

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