CN201426039Y - Centralized control and protection device for TRT and GIS combined electric appliance - Google Patents
Centralized control and protection device for TRT and GIS combined electric appliance Download PDFInfo
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- CN201426039Y CN201426039Y CN2009200138834U CN200920013883U CN201426039Y CN 201426039 Y CN201426039 Y CN 201426039Y CN 2009200138834 U CN2009200138834 U CN 2009200138834U CN 200920013883 U CN200920013883 U CN 200920013883U CN 201426039 Y CN201426039 Y CN 201426039Y
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Abstract
The utility model discloses a centralized control and protection device for a TRT and GIS combined electric appliance, relating to centralized automatic control technology in metallurgical and power systems. The centralized control and protection device comprises a detection unit, a control unit and an actuation unit. The secondary side LH of a current transformer of the detection unit is connected with the current input end of the control unit; the 2 LH secondary side of the current transformer of the detection unit is connected with an overvoltage protector GYB; the detecting end of the control unit is respectively connected with a gas pressure detection device and an SF6 gas density detection device; a power supply terminal of the control unit is connected with a DC power source; the voltage detecting terminal of the control unit is connected with a voltage transformer at the secondary side of a transformer; the output end of the control unit is connected with a GIS combined electric appliance transformer substation breaker 1DL of the actuating unit; and the GIS combined electric appliance transformer substation breaker 1DL of the actuating unit is respectively connected with the outlet 2DL of an engine F and the secondary side of the transformer. The centralized control and protection device is capable of effectively controlling and protecting the safe performance of the associated equipment in blast-furnace gas residual pressure power generation.
Description
Technical field
The utility model relates to electric power system centralized and automatic control technology, particularly with the automatic control of TRT generating and GIS combined electrical apparatus and protect relevant.
Background technology
TRT is the abbreviation of " blast-furnace top gas recovery turbine generator ", it is the of great value secondary energy sources retracting device of internationally recognized iron and steel enterprise, pressure energy and heat energy that it utilizes top gas to have are converted into mechanical energy by turbine expansion acting, thereby drive generator for electricity generation.This generation mode neither consumes any fuel, does not also produce environmental pollution, and cost of electricity-generating is extremely low, is the great energy-conservation project of blast furnace process operation, and economic benefit is very remarkable.The TRT device has replaced the high pressure valve group of original coal gas system, and different is, the high pressure valve group of rough gas system can leak away the pressure of coal gas in vain, and the TRT device can reclaim about 30% of blast furnace air energy.But; the electric energy that TRT sends is in the electrical network regeneration processes; because the precision of protective device and the imperfection of defencive function; automatically degree of concentration of control is low; and the problems such as defective of the air-insulated open type switchgear of original transformer station (AIS); often cause misoperation of TRT system or tripping to do, cause TRT parallel off or load rejection.In addition since secondary wiring of current mutual inductor occurs loosening or during maintenance human error cause the Current Transformer Secondary open circuit, or primary current is excessive, often causes current transformer to burn or overvoltage infringement equipment etc., causes heavy losses.
Summary of the invention
In order to solve defective described in the background technology, the utility model provides TRT and the GIS combined electrical apparatus centralized control and the protective device of a kind of effective control and the safe operation of protection blast furnace gas excess pressure power generating relevant device.
TRT provided by the utility model and GIS combined electrical apparatus centralized control and protective device; it is characterized in that: comprise having current transformer LH that detects TRT main circuit current function and detecting unit, also comprise gaseous-pressure and SF with overvoltage protector GYB of current transformer open-circuit-protection, filter function
6Gas density measuring ability, data communication facility, control GIS combined electrical apparatus are carried out the control unit of function, also comprise the performance element with control GIS combined electrical apparatus substation breakers 1DL function; Current transformer LH secondary in the described detecting unit is connected with the control unit current input terminal, and wherein the current transformer 2LH secondary of detecting unit also is connected with overvoltage protector GYB, the test side of control unit respectively with gaseous-pressure, SF
6The gas density checkout gear is connected, the power supply terminal of control unit connects DC power supply, the voltage detection terminal of control unit connects the voltage transformer of Circuit Fault on Secondary Transformer, the output of control unit connects the GIS combined electrical apparatus substation breakers 1DL of performance element, and GIS combined electrical apparatus substation breakers 1DL links to each other with transformer secondary with generator F outlet 2DL respectively in the performance element.
According to above-mentioned TRT and GIS combined electrical apparatus centralized control and protective device, its described control unit has the overcurrent protection of composite voltage locking direction, the locking of overcurrent negative sequence voltage, the PT broken string moves back current protecting function.
The utility model beneficial effect is:
1, used over-pressure safety device in Current Transformer Secondary; if solved the secondary winding open circuit that is in operation; or a winding flows through abnormal current (as lightning current, resonance overcurrent, electric capacity charging current, inductance starting current etc.); insulation works the mischief to electrical secondary system to produce high pressure at secondary side; make the too drastic and scaling loss of instrument transformer, even the problems such as life security that jeopardize the staff.
2, this device adopts instantaneous, protections in limited time such as power direction I section overcurrent, power direction II section overcurrent to the electric energy that electrical network arrives the TRT direction, the protection angle is at+45 °～-135 °, the overcurrent low-voltage dead lock, the locking of overcurrent negative sequence voltage, PT breakage lock device etc., ensured the straightway electrical network that is fed to of the electric energy that comes from the TRT generator, and when this installs to the generator circuit short circuit or ground connection and uneven transverse electric stream (negative-sequence current) appear when reaching set point, this device starts protection, guarantees selectively tripping operation;
3, this device can be by ethernet operation, and online data is revised, and by complete monitor supervision platform of integrated protection formation of Ethernet and whole transmission transformer station, realizes the background computer monitoring, unmanned guard.TRT and generalized information system adopt concentrates optimal control, and resource is fully used.
4, GIS adopts the SF of insulation property and arc extinction performance excellence
6Gas is as insulation and arc-extinguishing medium, and all High-Voltage Electrical Appliances elements are sealed in the aluminium grounded metal tube, compare with open transformation device of tradition, the GIS floor space is little, the whole sealings of element are not subjected to environmental interference, operational reliability height, convenient, the advantages such as the time between overhauls(TBO) is long, maintenance workload is little, installation is rapid, operating cost is low, no electromagnetic interference of operation.TRT adopts the turbine expansion generation technology, the blast furnace gas excess pressure power generating principle is to utilize turbo-expander that pressure energy and a part of calorific potential of former loss blast furnace gas on the pressure-reducing valve group are converted to mechanical energy, by generator mechanical energy is become power delivery again and gives electrical network.Blast furnace gas excess pressure power generating has not only reclaimed blast furnace gas part energy (account for blast furnace blower energy 30%), has reduced environmental pollutions such as noise, has improved the regulation quality of blast furnace roof pressure simultaneously, is more conducive to blast furnace production.
Description of drawings
Concrete structure of the present utility model is provided by the following drawings.
Fig. 1 is the utility model mechanism principle schematic diagram;
Fig. 2 is the composite voltage locking direction overcurrent protection function logic diagram in the utility model control unit.
Among Fig. 1; the 1LH of detecting unit 1 is 0.5 grade a high precision current transformer; be used for measuring; 2LH is the current transformer of 10P level; be used for the phase fault protection; 3LH is a zero sequence current mutual inductor; be used for ground protection, 1 pin of control unit 2; 2 pin; 3 pin; 4 pin; 5 pin; 6 pin are current input terminal, and 7 pin are output; 8 pin; 9 pin; 10 pin are voltage detection terminal; 11 pin; 12 pin are the controller power source terminal, in order to connect DC power supply L+; L-, 13 pin; 14 pin are respectively pressure and Density Detection end; the transformer of performance element 3 is 66/10KV; 240000KVA, GIS combined electrical apparatus are the SF that all adopts insulation property and arc extinction performance excellence
6Gas is as the metal enclosed switchgear of dielectric, it is the high Hair Fixer transformation device that is combined by circuit breaker, bus, isolating switch, voltage transformer, current transformer, lightning arrester, 7 kinds of High-Voltage Electrical Appliances of sleeve pipe, have the line of can be implemented in monitoring and intelligent controlled function, circuit breaker that GIS joins adopts the self extinguishing type arc quenching principle of " thermal expansion+help and blow ".TRT adopts the turbine expansion generation technology.
Among Fig. 2, Ia, Ic are fault current, and I1 is the current protection setting value, and voltage during the Umin fault, Uz are the low-voltage setting value, and negative sequence voltage when Uf is fault, Ufz are the negative sequence voltage setting value, and T1 is a timer.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.
As shown in Figure 1; when in GIS combined electrical apparatus substation breakers 1DL and the TRT device between the generator F outlet 2DL when circuit generation three-phase symmetrical short-circuit or phase fault and earth fault; control unit 2 is according to the variation (phase place and size) of current transformer 2LH to the current sampling between 1DL and the 2DL; and the variation of the phase place of transformer secondary voltage transformer voltage and size; compare with set point; analyze and calculate; make respective handling; as Ia and Ubc; Ib and Uca; the phase angle of Ic and Uab is between+45 °～-135 °; fault current reaches current setting value; and overcurrent low-voltage dead lock or overcurrent negative sequence voltage locking input also reach set point; PT does not break; power direction is for just; be that fault power is to TRT by GIS; then corresponding GIS combined electrical apparatus substation breakers 1DL cuts off in 7 pin of the control unit 2 output high level control execution unit 3, makes corresponding protection.Controller 2 monitors SF among gaseous-pressure and the GIS by 13 pin, 14 pin simultaneously
6Gas density is also made corresponding protection, and above-mentioned two protections are all monitored by the communication port (Ethernet) of controller 2 at any time by background computer;
If when the current transformer 2LH secondary winding open circuit that is in operation; or a winding flows through abnormal current (as lightning current; the resonance overcurrent; the electric capacity charging current; inductance starting current etc.); the high pressure that produces at secondary side can be limited in allowed band by device overvoltage protector GYB; element t is after the through-flow intensification of overvoltage pressure limiting; reliably automatic short-circuit; short circuit current is by the coil of current relay LC; the normal opened contact K of LC is element t short circuit; form from refilling the road; effectively protected element t because the too high possibility of burning of temperature rise; relay LC also send one road contact to the backstage monitoring equipment, and the prompting monitor staff searches fault and resets.Overvoltage protector GYB also has filter function, mainly by element C electric current is carried out filtering, detects on-the-spot harmonic wave situation with harmonic analyzer, and the various combination according to harmonic wave selection element C prevents that instrument transformer from burning and Harmonic Interference controller 2.
As shown in Figure 2; the composite voltage of control unit 2 by low-voltage and negative sequence voltage or the door form; low voltage component line taking voltage moves when in Uab, Ubc, three line voltages of Uca any one is lower than overcurrent low-voltage lockout definite value, and is open by the latching current protection component.When overcurrent negative sequence voltage during, same open by the latching current protection component greater than negative sequence voltage locking definite value.The low-voltage lockout criterion can judge whether the fault that really is short-circuited, if electric current greater than definite value the time voltage also be lower than definite value, just represent that at this moment circuit has been short-circuited fault, protection will be moved, disengagement failure.Under the situation of incidence element not,, start corresponding timer T1 through time-delay outlet action when arbitrary during in the three-phase protective electric current greater than corresponding setting value.Be applied as the duplicate supply circuit herein, the three-phase current protection should add direction component.Dropping under the direction protection function situation, when breaking down, must power direction be just action of timing protection, and promptly fault power is to TRT by GIS.In addition, when the PT disconnection fault occurring, direction component withdraws from automatically, not Lock effect.When arbitrary voltage during greater than 0.1In, is thought the PT broken string less than 70V and arbitrary phase current.The extra current condition is for preventing the alarm of inlet wire decompression mistiming.When PT breakage lock device defencive function dropped into, just this segment protect of locking of PT broken string only under the situation that its low-voltage dead lock (negative sequence voltage locking) or direction component drop into, took place in certain section current protection; Low-voltage dead lock (negative sequence voltage locking) or direction component all withdraw under the situation, and this segment protect function of PT breakage lock device disappears automatically.
Claims (1)
1, TRT and GIS combined electrical apparatus centralized control and protective device; it is characterized in that: comprise having current transformer LH that detects TRT main circuit current function and detecting unit (1), also comprise having gaseous-pressure and SF with overvoltage protector GYB of current transformer open-circuit-protection, filter function
6Gas density measuring ability, data communication facility, the overcurrent protection of composite voltage locking direction, the locking of overcurrent negative sequence voltage, PT broken string move back the control unit (2) of current protecting function, also comprise the performance element (3) with control GIS combined electrical apparatus substation breakers 1DL function; Current transformer LH secondary in the described detecting unit (1) is connected with control unit (2) current input terminal; wherein the current transformer 2LH secondary of detecting unit (1) also is connected with overvoltage protector GYB, the test side of control unit (2) respectively with gaseous-pressure, SF
6The gas density checkout gear is connected, the power supply terminal of control unit (2) connects DC power supply, the voltage detection terminal of control unit (2) connects the voltage transformer of Circuit Fault on Secondary Transformer, the output of control unit (2) connects the GIS combined electrical apparatus substation breakers 1DL of performance element (3), and GIS combined electrical apparatus substation breakers 1DL links to each other with transformer secondary with generator F outlet 2DL respectively in the performance element (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200138834U CN201426039Y (en) | 2009-05-22 | 2009-05-22 | Centralized control and protection device for TRT and GIS combined electric appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200138834U CN201426039Y (en) | 2009-05-22 | 2009-05-22 | Centralized control and protection device for TRT and GIS combined electric appliance |
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| CN201426039Y true CN201426039Y (en) | 2010-03-17 |
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| CN2009200138834U Expired - Lifetime CN201426039Y (en) | 2009-05-22 | 2009-05-22 | Centralized control and protection device for TRT and GIS combined electric appliance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623256A (en) * | 2017-10-25 | 2018-01-23 | 中石化中原石油工程有限公司西南钻井分公司 | Switch cubicle and its control method |
| CN110690686A (en) * | 2019-09-27 | 2020-01-14 | 衢州光明电力投资集团有限公司 | Sulfur hexafluoride gas-based overvoltage protection method for power transmission and distribution equipment |
-
2009
- 2009-05-22 CN CN2009200138834U patent/CN201426039Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623256A (en) * | 2017-10-25 | 2018-01-23 | 中石化中原石油工程有限公司西南钻井分公司 | Switch cubicle and its control method |
| CN107623256B (en) * | 2017-10-25 | 2023-08-01 | 中石化中原石油工程有限公司西南钻井分公司 | Switch cabinet and control method thereof |
| CN110690686A (en) * | 2019-09-27 | 2020-01-14 | 衢州光明电力投资集团有限公司 | Sulfur hexafluoride gas-based overvoltage protection method for power transmission and distribution equipment |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINA THIRD METALLURGICAL GROUP CO., LTD. ELECTRIC Free format text: FORMER OWNER: TIAN YINFU Effective date: 20110530 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 114003 NO. 108, 2/F, UNIT 6, BUILDING 3, BETUANJIE STREET, LISHAN DISTRICT, ANSHAN CITY, LIAONING PROVINCE TO: 114004 NO. 8, DUILU STREET, TIEDONG DISTRICT, ANSHAN CITY, LIAONING PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110530 Address after: 114004, Iron East Street, Anshan, Liaoning Province, No. 8, furnace Street Patentee after: China Third Metallurgical Group Co., Ltd. Electrical Installation Engineering Company Address before: 114003 Anshan province Liaoning City mountain north unity Street 3 Building 6 unit 2 floor No. 108 Patentee before: Tian Yinfu |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100317 |