CN201829857U

CN201829857U - HGIS (Hybrid Gas Insulated Switchgear) high-voltage electrical apparatus combined with electronic mutual inductor

Info

Publication number: CN201829857U
Application number: CN2010205848527U
Authority: CN
Inventors: 陈锡培; 贺臣
Original assignee: Guangxi China Power New Energy Electric Co ltd; Maoming Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangxi China Power New Energy Electric Co ltd; Maoming Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2010-11-01
Filing date: 2010-11-01
Publication date: 2011-05-11
Anticipated expiration: 2020-11-01

Abstract

The utility model discloses an HGIS (Hybrid Gas Insulated Switchgear) high-voltage electrical apparatus combined with an electronic mutual inductor, comprising an SF6 air chamber, a breaker sealed in the air chamber, a side I isolating/grounding switch and a side II isolating/grounding switch respectively and electrically connected with both ends of the breaker, as well as an ETV (electronic voltage transformer), wherein voltage on a bonding conductor between one isolating/grounding switch and the breaker is sampled at the primary side of the voltage transformer; the side I stands for the busbar side; and the side II stands for the main transformation side or the line side. In the utility model, the voltage transformer is directly installed on the HGIS, instead of being separately installed, so that the space occupied by the apparatus is saved; the EVT is directly connected on the breaker, and can be disconnected through the breaker and the isolating switches at both ends of the breaker, so that the overhaul of EVT is convenient; and thorough electrical isolation between primary equipment and secondary equipment of the system can be realized by the EVT through an optical fiber, so that the safety and reliability of the secondary equipment and the system can be improved and the measurement accuracy is increased.

Description

Combination has the HGIS High-Voltage Electrical Appliances of electronic mutual inductor

Technical field

The utility model relates to a kind of high pressure combined electrical apparatus in the field of electrical equipment, especially relates to the HGIS High-Voltage Electrical Appliances that a kind of combination has electronic mutual inductor.

Background technology

The construction of China's intelligent substation has progressively entered a Rapid development stage, an intellectuality that key technology is a primary equipment of intelligent substation, a switch of intelligent substation use at present has three types: traditional porcelain knob (AIS) switch, GIS combined electrical apparatus and HGIS combined electrical apparatus.HGIS (Hybrid Gas Insulated Switchgear) is a kind of novel high-pressure switchgear between conventional air insulation switchgear (AIS) and gas-insulated switchgear (GIS).Structure and the GIS of HGIS are basic identical, and set such as circuit breaker, isolation/ground connection unit switch, current transformer are become a module, be a complete turnover line interval, and each all have oneself independently air chamber mutually.The HGIS product has only used triennium just to obtain using widely at home, is to have following advantage owing to comparing with GIS and AIS:

1. overall economic efficiency height: mainly saved the soil and reduced cost;

2. advanced technology is reliable: as to have used new manufacturing process, made housing with high pressure aluminium casting technology, made the operating mode of sealing flange be greatly improved, realized the direct crimping of flange metal covering, made year let out leak rate and greatly reduce; Use the isolating switch of multistation, make inner primary structure greatly simplify; Isolating switch mechanism is sealed in the metal can, and having solved in the past, isolating switch mechanism exposes all aerial corrosion problem; The isolating switch of multistation itself just has from the project organization and prevents that mistake from grasping the work energy, and simple to operate, and power consumption is little;

3. convenient the arrangement and maintenance: HGIS belongs to non-maintaining equipment substantially, and producer generally only requires 5-7 to carry out preventive trial one time;

4. because HGIS does not comprise bus equipment, and promptly its bus is not loaded in the SF6 air chamber, expose, thereby wiring is clear, succinct, compact, installation and Maintenance and Repair are convenient, the operational reliability height.

Voltage transformer is transmission of electricity and the indispensable a kind of electrical equipment of electric power system such as power plant, electric substation, is a kind of being used for ac high voltage to be changed into the potential device that can supply instrument, relay to measure or use.Owing to be voltage, power and the electric energy that is used for Monitoring Line; perhaps be used for the valuable equipment in the protection circuit, motor and transformer when line failure; therefore the capacity of voltage transformer is very little, generally all has only several volt-amperes, tens volt-amperes, and maximum also is no more than one kilovolt-ampere.Voltage transformer is a transformer that band is unshakable in one's determination, it mainly is made up of first and second coil, iron core and insulation, its primary side is connected across between the line of electrical network or between line and ground, secondary side is connected on potential windings such as voltmeter or wattmeter, kilowatt-hour meter and relay or the automatics.Principle: when on a winding, applying a voltage U 1, in iron core, just produce a magnetic flux φ,, then in secondary winding, just produce a secondary voltage U2 according to the law of electromagnetic induction.Change once or the number of turn of secondary winding, can produce different primary voltages and secondary voltage ratio, this just can form the voltage transformer of different no-load voltage ratios.What generally adopt at present is electromagnetic type and capacitive voltage transformer.

The voltage transformer of non electromagnetic such as electronic type has begun to be applied in the GIS gas-insulated switchgear, but does not see application and report that combination has the HGIS High-Voltage Electrical Appliances of electronic type voltage transformer as yet.

The utility model content

The HGIS High-Voltage Electrical Appliances that provide a kind of combination that electronic mutual inductor is arranged promptly are provided the purpose of this utility model.

The utility model combination has the HGIS High-Voltage Electrical Appliances of instrument transformer, include the SF6 air chamber, and, the I side isolating/grounding switch and II side isolating/grounding switch and the electronic type voltage transformer that are closed in circuit breaker in this SF6 air chamber, are connected with these circuit breaker two ends respectively on electric; The primary side of described voltage transformer carries out voltage sampling from the bonding conductor between one of described isolating/grounding switch and the circuit breaker; Described I side refers to bus bar side; Described II side refers to main transformer side or line side.The primary side of described voltage transformer preferably carries out voltage sampling from the bonding conductor between I side isolating/grounding switch and the circuit breaker.

Described voltage transformer, the optional electronic type voltage transformer of using; Further, adopt coaxial capacitance dividing potential drop mode measuring voltage.The principle of electronic type voltage transformer is identical with traditional instrument transformer, promptly uses transformer principle, voltage divider principle, and what have also uses Hall effect.The difference of this instrument transformer and traditional instrument transformer is: its transducing part rate of not passing on Gong only transmits signal, and this signal is delivered to load after being amplified by amplifier again.Electronic type voltage transformer generally adopts capacitance partial pressure or electric resistance partial pressure technology, utilizes and the similar electronic type resume module of active electronic current transformer signal, uses optical fiber transmission signal.

The utility model combination has the application of HGIS High-Voltage Electrical Appliances in electric power system of instrument transformer to have following superiority:

(1) conserve space, voltage transformer need not be installed in addition, can be directly installed on the HGIS.

(2) electronic type voltage transformer (EVT) is directly received on the primary cut-out, and the isolating switch by circuit breaker and circuit breaker two ends can disconnect EVT, thereby is convenient to the maintenance of EVT.

(3) promote the precision of measuring.Adopt the use of the compound mode of HGIS-EVT; adopt the electronic mutual inductor of output digital signal; the voltage signal of EVT all can not produce additive error in the process that is transferred to the processing of secondary device and secondary device, promoted the system accuracy that protection system, measuring system and metering system are crossed.Simultaneously, because the electronic mutual inductor secondary is output as the small voltage analog signal of optical fiber and digital signal or 0～5V, there are not potential faults in second open circuit or short circuit, can not produce secondary device during by the big electric current of fault and destroy; Electric mutual inductor has been realized electric power system electric thorough isolation once and between secondary device by optical fiber, improves the security reliability of secondary device and relevant electric power system.

(4) improved the reliability that signal transmits.There is not ferromagnetic saturated or ferro resonance in electric mutual inductor, and bandwidth, response is fast, precision is high, measuring range is wide, the linearity is good, well the transient signal during the detection line fault; The signal transmission of EVT realizes with computer communication technology that all communication system is transmission information checking sign indicating number and sensible self check information in the transmission effective information, stops the signal of misinformating on the one hand, but technology alarm when communication system failure on the other hand.Digital signal can be used Optical Fiber Transmission, has fundamentally solved anti-interference problem.

(5) because traditional instrument transformer contains iron core, magnetic saturation is arranged, frequency band is narrow, range of dynamic measurement is little, accuracy of measurement is lower, it is low to measure the protection range inner linearization; volume is big, Heavy Weight; and second short circuit can produce big electric current; also can produce ferro resonance, be the significant trouble hidden danger in the power system operation.Obviously, the technical scheme of the utility model application HGIS-EVT compound mode can solve the above-mentioned intrinsic problem of traditional instrument transformer.

Description of drawings

Fig. 1 is the contour structures schematic diagram (front view) that the utility model makes up an embodiment of the HGIS High-Voltage Electrical Appliances that instrument transformer is arranged.

Fig. 2 is the left view of Fig. 1.

Fig. 3 is the circuit relationships schematic diagram of each assembly among the embodiment of the utility model combination HGIS High-Voltage Electrical Appliances that instrument transformer is arranged.

Reference numeral:

1-SF6 air chamber 2-voltage transformer 5-I side isolating/grounding switch (bus bar side)

4-II side isolating/grounding switch (main transformer side or line side) 6-circuit breaker

Embodiment

Combination has the HGIS High-Voltage Electrical Appliances of instrument transformer to be further described to the utility model below in conjunction with accompanying drawing:

Illustrated in figures 1 and 2, be the applied in any combination contour structures schematic diagram of HGIS and electronic type voltage transformer EVT.Fig. 3 is the circuit relationships schematic diagram of wherein each assembly.As shown in the figure, the HGIS High-Voltage Electrical Appliances mainly include SF6 air chamber 1, circuit breaker 6 and electric on the I side isolating/grounding switch 5 that is connected with these circuit breaker 6 two ends respectively and II side isolating/grounding switch 4 promptly seal and be installed in this SF6 air chamber 1; Electronic type voltage transformer 2 also seals and is installed in this SF6 air chamber 1, and its primary side carries out voltage sampling (referring to Fig. 3) from the bonding conductor between I side isolating/grounding switch 5 and the circuit breaker 6.Particularly, voltage transformer 2 can be directly installed on below the circuit breaker 6, and so directly measurement circuitry is by the voltage of switch, for use in metering and relaying protection.I side shown in Fig. 3 refers to bus bar side; The II side is looked concrete application scenarios, refers to main transformer side or line side.

By Fig. 1 and Fig. 2 as seen, combination have the HGIS High-Voltage Electrical Appliances of instrument transformer be a complete turnover line at interval, and each all has oneself independently air chamber mutually.

Described electronic type voltage transformer 2 adopts coaxial capacitance dividing potential drop mode measuring voltage.

The primary side of described electronic type voltage transformer 2 also can carry out voltage sampling from the bonding conductor between II side isolating/grounding switch 4 and the circuit breaker 6.

Claims

1. combination has the HGIS High-Voltage Electrical Appliances of instrument transformer, includes the SF6 air chamber, and, the I side isolating/grounding switch and the II side isolating/grounding switch that are closed in circuit breaker in this SF6 air chamber, are connected with these circuit breaker two ends respectively on electric; It is characterized in that: in this SF6 air chamber, also include electronic type voltage transformer; The primary side of described voltage transformer carries out voltage sampling from the bonding conductor between one of described isolating/grounding switch and the circuit breaker;

Described I side refers to bus bar side; Described II side refers to main transformer side or line side.

2. combination according to claim 1 has the HGIS High-Voltage Electrical Appliances of instrument transformer, it is characterized in that: described voltage transformer is electronic type voltage transformer.

3. combination according to claim 2 has the HGIS High-Voltage Electrical Appliances of instrument transformer, it is characterized in that: described electronic type voltage transformer, adopt coaxial capacitance dividing potential drop mode measuring voltage.

4. described combination has the HGIS High-Voltage Electrical Appliances of instrument transformer according to one of claim 1 to 3, it is characterized in that: the primary side of described voltage transformer, carry out voltage sampling from the bonding conductor between I side isolating/grounding switch and the circuit breaker.