CN105098637A - Integrated 35kV power transformation device - Google Patents

Abstract

The invention discloses an integrated 35kV power transformation device, belongs to a transformer substation form in the field of power transmission and transformation of a power system, and belongs to the technical field of power transmission and transformation devices. The 35kV transformer substation equipment units are combined into an integrated device through optimized combination, and the transformer substation function is achieved. The transformer device integrates a 35kV transformer, high-low voltage side switch equipment, a current transformer, a voltage transformer, an intelligent protection cabinet and a secondary cable. The invention has the advantages of suitability for the production and development characteristics of oil fields, realization of skid mounting, integration, portability and reutilization of 35kV power transformation devices, integration of a comprehensive protection system, improvement of the intelligent level, adoption of factory operation of the devices, convenience for quality management and reduction of construction workload.

Description

Integrated 35kV substation device

technical field

The invention relates to a form of substation in the field of power transmission and transformation of power systems, and belongs to the technical field of power transmission and transformation devices.

Background technique

Changqing Oilfield Power Grid is a power supply network with 110kV substations as the main supply and 35kV substations as the skeleton, of which 35kV substations account for more than 90%. 35kV substations are divided into regular substations and There are two types of line transformer sets.

1. Regular 35kV substation

As of 2014, a total of 78 35kV substations have been built, distributed in the three major power grids of Changqing Oilfield. The regular 35kV substation includes two voltage levels of 35kV and 10kV, and is composed of 35kV transformer, 35kV power distribution device, 10kV power distribution device, control room, secondary protection system, etc. The 35kV and 10kV wiring methods are single-bus section wiring. The 35kV power distribution device is arranged outdoors, and the 10kV power distribution device is arranged indoors. It mainly supplies power to wells and stations around the substation, and is the skeleton substation of Changqing Oilfield Power Grid.

The 35kV substation is suitable for the integrated development block, the load implementation, and the block with high requirements for power reliability, and the 35kV load is generally above 2500kW. The main features are as follows:

1) Complete facilities, complete protection and high reliability.

2) The construction period is long and the investment is high.

3) The load needs to be determined and built once.

2. Line transformer group

As of 2014, a total of 13 line transformer groups have been built. The line transformer groups have simple facilities and are composed of 35kV transformers, protective fuses, and 10kV cable branch boxes. It is suitable for the initial stage of rolling development block, where the power supply reliability requirement is low, and the load is below 2500kW. The line transformer group is protected by a simple drop-out fuse, which is incomplete, often causing power outages, poor reliability of power supply, and extremely inconvenient for operation and maintenance. The main features are as follows:

1) The equipment is simple, without comprehensive protection and low reliability.

2) Short construction period and low investment.

3) It cannot be expanded, and it needs to be rebuilt to develop into a regular substation.

3. There is a problem with the line transformer group

1) The line transformer group is used for power supply with uncertain production scale, unclear load or initial rolling development block, as a transitional substation, and it needs to be demolished in the later construction of regular substation. As of 2013, more than 10 line transformer groups have been demolished.

2) The wide application of digital and automation equipment in oilfield stations has continuously increased the requirements for power supply reliability and power quality, and the line transformer group cannot adapt to the development of oilfields.

3) It cannot be reused. The transformer needs a civil foundation, and the construction period is long and it is a one-time facility.

For the above problems, no effective solution has been proposed yet.

Contents of the invention

In order to solve the problems existing in the construction process of the substation and meet the needs of rapid construction of oil fields, the present invention provides a form of 35kV substation. By optimizing the combination of 35kV substation equipment units, they are combined into an integrated device to realize the function of the substation. It is a substation device integrating 35kV transformer, high and low voltage side switchgear, voltage transformer, intelligent protection cabinet and secondary cable.

An integrated 35kV substation device, on which a 35kV transformer, 35kV combined electrical appliance, 10kV vacuum circuit breaker, 35kV power supply PT, and intelligent protection cabinet are installed on the equipment skid. Circuit breaker, 10kV vacuum circuit breaker to connect outgoing cables. The intelligent protection cabinet integrates functions such as measurement, protection, and communication, and adopts a microcomputer automatic protection module, which has differential protection, backup protection, and measurement to meet the basic needs of protection. And through the communication module, the data upload, remote control and video monitoring of the substation can be realized.

According to an aspect of an embodiment of the present invention, an integrated 35kV power transformation device is provided, including: a 35kV power transformation control device, wherein the above-mentioned 35kV power transformation control device includes: an intelligent protection cabinet, a 35kV power supply PT, a 35kV combined electrical appliance, 35kV transformer and 10kV vacuum circuit breaker, the above-mentioned 35kV combined electrical appliance is connected to the above-mentioned 35kV transformer through the aluminum tube busbar, and the above-mentioned 35kV transformer is connected to the above-mentioned 10kV vacuum circuit breaker; the outgoing cable is connected to the above-mentioned 10kV vacuum circuit breaker in the above-mentioned 35kV substation control device Connection; equipment skid, connected with the above-mentioned 35kV substation control device.

Optionally, the above-mentioned 35kV combined electrical apparatus at least includes: a circuit breaker, an isolating switch, a current transformer and a voltage transformer, wherein the above-mentioned circuit breaker, the above-mentioned isolating switch, the above-mentioned current transformer and the above-mentioned voltage transformer are connected by an integral steel bracket .

Optionally, the volume of the above-mentioned 35kV transformer is less than or equal to the first threshold.

Optionally, the above-mentioned 35kV combined electrical apparatus and the above-mentioned 10kV vacuum circuit breaker form a three-stage overcurrent protection for the above-mentioned device.

Optionally, the above-mentioned intelligent protection cabinet includes: a display device for displaying state parameters of the above-mentioned device, wherein the above-mentioned state parameters at least include: the three-phase current at the high voltage side of the main transformer, the three-phase voltage line voltage, and the zero-sequence voltage; the communication device , used to send the above status parameters to the remote control center.

Optionally, the above device is erected on a steel support and connected to the base by bolts.

Optionally, the above device is set in an integrated substation.

The advantage of the present invention is that it is suitable for the characteristics of oilfield production and development, realizes skid-mounted and integrated 35kV substation devices, can be relocated and reused, and integrates a comprehensive protection system, which improves the level of intelligence. The device adopts factory operation, which is convenient Quality management, reduce construction workload.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, 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 are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a product or device comprising a series of elements is not necessarily limited to those elements explicitly listed, but may include without other units expressly listed or inherent in those products or equipment.

Example 1:

As shown in Figure 1, 1. Intelligent protection cabinet, 2. 35kV power supply PT, 3. 35kV combined electrical appliances, 4. Aluminum tube busbar, 5. 35kV transformer, 6. 10kV vacuum circuit breaker, 7. Equipment skid base, 8. outgoing cable.

The invention is a power transformation device integrating a 35kV transformer, high and low voltage side switchgear, a current transformer, a voltage transformer, an intelligent protection cabinet and a secondary cable. The voltage level of the 35kV transformer can be selected as 35/10kV, 35/6kV, 35/0.4kV, and the capacity of the transformer can be selected according to the needs of the project to realize the serialization of equipment.

As an optional embodiment, the embodiment of the present invention provides an integrated 35kV substation device, including:

1) 35kV substation control device, of which, the 35kV substation control device includes: intelligent protection cabinet, 35kV power supply PT, 35kV combined electrical appliance, 35kV transformer and 10kV vacuum circuit breaker, the 35kV combined electrical appliance is connected to the 35kV transformer through the aluminum tube busbar, and the 35kV The transformer is connected to the 10kV vacuum circuit breaker;

2) The outgoing cable is connected to the 10kV vacuum circuit breaker in the 35kV substation control device;

3) The equipment skid is connected with the 35kV substation control device.

As an optional embodiment, the 35kV combined electrical apparatus at least includes: circuit breakers, disconnectors, current transformers and voltage transformers, wherein the circuit breakers, disconnectors, current transformers and voltage transformers are connected by integral steel brackets .

As an optional embodiment, the volume of the 35kV transformer is less than or equal to the first threshold.

As an optional embodiment, a 35kV combined electrical appliance and a 10kV vacuum circuit breaker form a three-stage overcurrent protection for the device.

As an optional embodiment, the intelligent protection cabinet includes:

1) The display device is used to display the state parameters of the device, wherein the state parameters at least include: the three-phase current at the high-voltage side of the main transformer, the three-phase voltage line voltage, and the zero-sequence voltage;

2) A communication device, used to send the state parameters to the remote control center.

As an optional embodiment, the above-mentioned device is erected on a steel support and connected to the base by bolts.

As an optional embodiment, the above device is set in an integrated substation.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

In the above-mentioned embodiments of the present invention, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content can be realized in other ways. Wherein, the device embodiments described above are only illustrative. For example, the division of the units may be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or may be Integrate into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of units or modules may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (8)

1. An integrated 35kV power transformation device, characterized in that an intelligent protection cabinet, a 35kV power supply PT, a 35kV combined electrical appliance, a 35kV transformer and a 10kV vacuum circuit breaker are installed on the equipment skid, and the 35kV combined electrical appliance is connected to the The 35kV transformer, the 35kV transformer is connected to the 10kV vacuum circuit breaker, the 10kV vacuum circuit breaker is connected to the outgoing cable, and the intelligent protection cabinet is connected to the 35kV power supply PT, the 35kV combination appliance, and the 35kV transformer through cables and the 10kV vacuum circuit breaker. 2. An integrated 35kV substation device, characterized in that it comprises: 35kV substation control device, wherein the 35kV substation control device includes: an intelligent protection cabinet, a 35kV power supply PT, a 35kV combined electrical appliance, a 35kV transformer and a 10kV vacuum circuit breaker, and the 35kV combined electrical appliance is connected to the 35kV Transformer connection, the 35kV transformer is connected to the 10kV vacuum circuit breaker; An outgoing cable connected to the 10kV vacuum circuit breaker in the 35kV substation control device; The equipment skid is connected with the 35kV substation control device. 3. The device according to claim 1, characterized in that, the 35kV combined electrical apparatus at least comprises: a circuit breaker, a disconnector, a current transformer and a voltage transformer, wherein the circuit breaker, the disconnector, The current transformer and the voltage transformer are connected through an integral steel bracket. 4. The device according to claim 1, wherein the volume of the 35kV transformer is smaller than or equal to the first threshold. 5. The device according to claim 1, characterized in that, the 35kV combined electrical appliance and the 10kV vacuum circuit breaker form a three-stage overcurrent protection for the device. 6. The device according to claim 1, wherein the intelligent protection cabinet comprises: The display device is used to display the state parameters of the device, wherein the state parameters at least include: the three-phase current at the high voltage side of the main transformer, the three-phase voltage line voltage, and the zero-sequence voltage; The communication device is used to send the state parameter to the remote control center. 7. The device according to claim 1, characterized in that the device is erected on a steel support and connected to the base by bolts. 8. The device according to any one of claims 1-7, characterized in that the device is arranged in an integrated substation.