CN218415823U

CN218415823U - Transformer substation PT resonance elimination device

Info

Publication number: CN218415823U
Application number: CN202222355822.4U
Authority: CN
Inventors: 郭燕; 于海明; 张鑫; 宋国尊; 臧金彤; 梁楠; 刘洋; 白鑫
Original assignee: Ordos Power Supply Branch Of Inner Mongolia Electric Power Group Co ltd
Current assignee: Ordos Power Supply Branch Of Inner Mongolia Electric Power Group Co ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2023-01-31
Anticipated expiration: 2032-09-06

Abstract

The utility model discloses a belong to harmonic elimination technical field, specifically be a transformer substation PT harmonic elimination device, including the handcart body, be equipped with transformer substation PT harmonic elimination device on the handcart body, still include: spiral inductance coils, spiral inductance coils's one end is connected with the ground connection subassembly on the PT harmonic elimination device of transformer substation, harmonic elimination resistance's one end and spiral inductance coils electric connection, soft copper tape, the one end and harmonic elimination resistance electric connection of soft copper strip, the ground connection circuit that links to each other with the ground, ground connection circuit's one end and soft copper tape electric connection, the utility model discloses a spiral inductance coils increase resistance reduces the resonance and crosses the current value, and rethread harmonic elimination resistance and soft copper tape lug connection ground have very big improvement former ground connection have the clearance when the inrush current is great in the system, lead to the unable problem of releasing to the ground completely of electric current to can avoid resonance overcurrent to burn out mutual-inductor and handcart system.

Description

Transformer substation PT resonance elimination device

Technical Field

The utility model relates to a harmonic elimination technical field specifically is a PT harmonic elimination device of transformer substation.

Background

The harmonic elimination device is a harmonic passive filter device specially used for 3, 5, 7, 11, 13 and above of a low-voltage power grid. And the PT resonance elimination device is secondary electrical equipment which is placed on the secondary side of the PT to eliminate ferromagnetic resonance. The method is mainly used for power distribution systems of large enterprises such as electric power, metallurgy, coal, petroleum and chemical industry.

The resonance elimination device has the following functions: the power system has many iron core inductive elements, such as transformer, voltage transformer, arc suppression and parallel compensation reactor, which are mostly non-linear elements, and they form many complex oscillation loops with the system capacitance, if certain conditions are satisfied, ferromagnetic resonance overvoltage with long duration can be excited. The high overvoltage and large overcurrent generated when the ferromagnetic resonance occurs easily damage the insulation of the power equipment, and endanger the safety of operating personnel in severe cases. The microcomputer resonance elimination device monitors the voltage and the frequency at the three corners of the PT opening of the voltage transformer in real time, and when ferromagnetic resonance occurs, the device instantly starts a contactless resonance elimination element to generate strong damping, so that the ferromagnetic resonance is eliminated.

The working principle of the resonance elimination device is as follows: the microcomputer resonance elimination device adopts a high-performance single chip microcomputer as a core element to carry out the ring-hiding detection on PT opening triangular voltage (namely zero sequence voltage). Under the normal working condition, the voltage is less than 30V, and a high-power harmonic elimination element (a solid-state relay) in the device is in a blocking state, so that the system operation is not influenced. When the PT open voltage is more than 30V, the system malfunctions. The harmonic elimination device starts to acquire data of the signal, digital signal processing technologies such as digital measurement, filtering and amplification are carried out on the signal through a circuit, and then the detected data are analyzed and calculated to obtain the fault type. If the current is ferromagnetic resonance, the system immediately starts a resonance elimination circuit to enable the solid-state relay to be conducted, and the ferromagnetic resonance disappears rapidly under the damping action. At this moment, the CPU system records and stores, and automatically alarms and displays resonance information (time, frequency and voltage values). If the circuit is over-voltage or single-phase earth fault, the microcomputer system can give out display and alarm respectively after detecting, and record and store the related fault information. And finally, returning to the initial state after the CPU system finishes processing, and continuously detecting the state in the circuit.

Since PT of a 35kV Wulan transformer substation is burnt for many times in nearly two years, technical innovation is urgently needed to solve the problems. Through burning out the reason to transformer substation PT and analyzing, some problems have been discovered, when PT burns out at every turn, earth fault can take place for the circuit, 10kV circuit sends earthing signal, later the unstable phenomenon of voltage will appear, inspection 10kV PT finds that ground connection phase PT explodes because of overheated most of, the number of times that inspection secondary elimination coordination device shows ground connection finds secondary elimination coordination device when resonance appears at every turn, if do not take corresponding countermeasure, change behind the PT that burns out, the operation can take place ground connection in the short time, PT can burn out once more. The PT burning loss reason of the Wulan 35kV transformer substation is contrastively analyzed, the PT is found to generate the resonance phenomenon because of the grounding of a 10kV line, the PT generates heat and burns loss because of the influence of resonance inrush current, the harmonic elimination capability of the existing device is not enough, and the burning loss fault of the PT device caused by grounding can be solved only by transforming the harmonic elimination device, namely solving the resonance phenomenon.

SUMMERY OF THE UTILITY MODEL

The utility model discloses in view of above-mentioned and/or the problem that exists among the current transformer substation PT harmonic elimination device, provided the utility model discloses.

Therefore, the utility model aims at providing a transformer substation PT harmonic elimination device can solve the above-mentioned current problem of proposing.

For solving the technical problem, according to the utility model discloses an aspect, the utility model provides a following technical scheme:

the utility model provides a transformer substation PT harmonic elimination device, its includes the handcart body, be equipped with transformer substation PT harmonic elimination device on the handcart body, still include:

one end of the spiral inductance coil is connected with a grounding assembly on the PT resonance elimination device of the transformer substation;

one end of the resonance elimination resistor is electrically connected with the spiral inductance coil;

one end of the soft copper strip is electrically connected with the resonance elimination resistor;

and one end of the grounding line is electrically connected with the soft copper strip.

As a preferred scheme of transformer substation PT harmonic elimination device, wherein: the spiral inductance coil is formed by winding a copper-plastic wire into a spiral coil.

As a preferred scheme of transformer substation PT harmonic elimination device, wherein: and copper wiring terminals are fixedly arranged at two ends of the soft copper strip, one group of the copper wiring terminals are electrically connected with the resonance elimination resistor, and the other group of the copper wiring terminals are electrically connected with the grounding circuit.

As a preferred scheme of transformer substation PT harmonic elimination device, wherein: the grounding assembly includes:

the transformer substation PT resonance elimination device is provided with a grounding port;

the conductive grounding rod is fixedly arranged in the grounding port;

and one end of the conductive grounding rod is set as a grounding contact, and the grounding contact is electrically connected with one end of the spiral inductance coil.

Compared with the prior art:

the utility model discloses a spiral inductance coils increase resistance reduces the resonance overcurrent value, and rethread harmonic elimination resistance and soft copper area lug connection ground have very big improvement former earthing device and have the clearance when the inrush current is great in the system, lead to the problem that the electric current can't be released completely to the ground to can avoid resonance overcurrent to burn out mutual-inductor and handcart system.

Drawings

Fig. 1 is a schematic side view of the handcart body structure of the utility model;

FIG. 2 is a schematic front view of the PT resonance elimination device of the transformer substation of the present invention;

FIG. 3 is a schematic side view of the PT resonance elimination device of the transformer substation of the present invention;

fig. 4 is a schematic view of the conductive ground rod of the present invention;

fig. 5 is a schematic view of the overall principle of the present invention.

In the figure: the handcart body 10, the transformer substation PT resonance elimination device 20, the grounding port 21, the conductive grounding rod 22, the grounding contact 23, the spiral inductance coil 30, the resonance elimination resistor 40, the soft copper strip 50 and the grounding circuit 60.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The utility model provides a transformer substation PT harmonic elimination device, please refer to fig. 1-5, which comprises a handcart body 10, wherein a transformer substation PT harmonic elimination device 20 is arranged on the handcart body 10;

further comprising: the inductor comprises a spiral inductance coil 30, a resonance elimination resistor 40, a soft copper strip 50 and a grounding circuit 60 connected with the ground;

one end of the spiral inductance coil 30 is connected with a grounding component on the transformer substation PT resonance elimination device 20, one end of the resonance elimination resistor 40 is electrically connected with the spiral inductance coil 30, one end of the soft copper strip 50 is electrically connected with the resonance elimination resistor 40, one end of the grounding circuit 60 is electrically connected with the soft copper strip 50, the spiral inductance coil 30 is formed by winding copper plastic wires into a spiral coil, copper wiring terminals are fixedly installed at two ends of the soft copper strip 50, one group of copper wiring terminals are electrically connected with the resonance elimination resistor 40, and the other group of copper wiring terminals are electrically connected with the grounding circuit 60.

The grounding assembly includes: a ground port 21, a conductive ground rod 22, a ground contact 23;

the transformer substation PT resonance elimination device 20 is provided with a grounding port 21, a conductive grounding rod 22 is fixedly installed in the grounding port 21, one end of the conductive grounding rod 22 is set as a grounding contact 23, and the grounding contact 23 is electrically connected with one end of the spiral inductance coil 30.

The installation process comprises the following steps:

the method comprises the following steps: winding the copper-plastic wire into a spiral coil to obtain a spiral inductance coil 30;

step two: cutting a soft copper strip 50 with a proper length, and fixing copper connecting terminals at two ends of the soft copper strip 50;

step three: one end of the spiral inductor 30 is connected to the ground contact 23, one end of the resonance elimination resistor 40 is electrically connected to the spiral inductor 30, one set of copper connection terminals is electrically connected to the resonance elimination resistor 40, and at the same time, the other set of copper connection terminals is electrically connected to the ground line 60.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the disclosed embodiments of the present invention can be used in any combination with each other, and the non-exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a transformer substation PT harmonic elimination device, includes handcart body (10), be equipped with transformer substation PT harmonic elimination device (20) on handcart body (10), its characterized in that still includes:

one end of the spiral inductance coil (30) is connected with a grounding component on the PT resonance elimination device (20) of the transformer substation;

the resonance elimination resistor (40), one end of the resonance elimination resistor (40) is electrically connected with the spiral inductance coil (30);

one end of the soft copper strip (50) is electrically connected with the resonance elimination resistor (40);

and the grounding line (60) is connected with the ground, and one end of the grounding line (60) is electrically connected with the soft copper strip (50).

2. A substation PT detuning arrangement according to claim 1, characterized in that the spiral inductor winding (30) is formed by winding copper-plastic wire into a spiral winding.

3. A substation PT resonance elimination apparatus according to claim 1, characterized in that both ends of the soft copper strip (50) are fixedly mounted with copper connection terminals, one set of the copper connection terminals is electrically connected with the resonance elimination resistor (40), and the other set of the copper connection terminals is electrically connected with the grounding line (60).

4. A substation PT detuning arrangement according to claim 1, characterized in that the grounding assembly comprises:

the transformer substation PT resonance elimination device (20) is provided with a grounding port (21), and the grounding port (21) is formed in the transformer substation PT resonance elimination device;

a conductive ground rod (22), the conductive ground rod (22) being fixedly mounted in the ground port (21);

and one end of the conductive grounding rod (22) is set as a grounding contact (23), and the grounding contact (23) is electrically connected with one end of the spiral inductance coil (30).