CN108462174B - Method for preventing abnormal shutdown of hydraulic power plant transformer - Google Patents
Method for preventing abnormal shutdown of hydraulic power plant transformer Download PDFInfo
- Publication number
- CN108462174B CN108462174B CN201810398069.2A CN201810398069A CN108462174B CN 108462174 B CN108462174 B CN 108462174B CN 201810398069 A CN201810398069 A CN 201810398069A CN 108462174 B CN108462174 B CN 108462174B
- Authority
- CN
- China
- Prior art keywords
- main transformer
- transformer
- temperature
- preventing
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Transformers (AREA)
Abstract
The invention discloses a method for preventing abnormal shutdown of a hydraulic power plant transformer, which comprises the following steps: step 1, preventing a main transformer of a main water power plant from being overloaded and being stopped due to exceeding temperature; step 2, preventing the main transformer from being shut down due to overload of the interconnection transformer; step 3, preventing the main transformer from being shut down due to temperature rise; the problem of prior art in "remote centralized control few people maintain" management mode, because on-the-spot unmanned on duty, when taking place the main transformer temperature too high, centralized control operation personnel or operation and maintenance personnel all do not discover unusually, can not intervene main transformer control in time, lead to main transformer operational aspect to worsen etc. technical problem is solved.
Description
Technical Field
The invention belongs to the hydropower station transformer operation control technology, and particularly relates to a method for preventing abnormal shutdown of a hydropower station transformer.
Background art:
the loss of the transformer mainly comes from iron loss and copper loss inside the transformer, and according to the efficiency curve of the transformer, when the output of the transformer is zero, the efficiency is also zero; as the transformer output increases, the efficiency begins to increase until it reaches a maximum and then begins to decrease. This is because the iron loss of the transformer does not substantially vary with the load, and therefore the efficiency is low when the load is small. The copper loss is in direct proportion to the square of the load current, the copper loss is increased rapidly along with the increase of the load, the efficiency of the transformer is reduced, the overload operation of the transformer is not to cause the transformer to have more load and output, but is in a proper way, and the output efficiency of the transformer is reduced. Of course, an overload operation of the transformer is also possible, but this has the preconditions: the overload capacity of the transformer is determined according to the capacity of the transformer, the capacity of the transformer can be higher than the rated load of the transformer, but the related regulations of the load multiple and the allowed overload duration are not allowed to be exceeded, and the temperature rise of the transformer cannot exceed the specified standards.
Influence of overload operation temperature on transformer
The temperature rise of the transformer has great influence on the operation of the transformer, and most of all, the insulation strength of the transformer is influenced. When the temperature of the transformer rises, the resistance of the coil increases, and the copper loss increases accordingly. Meanwhile, the temperature rise of the transformer also has influence on the strength of the insulating material. When the transformer is produced, the used materials include an iron core made of a metal material and a high-low voltage coil made of an insulating material. The transformer iron core can endure high temperature without damage, and the temperature of the coil can be greatly damaged after exceeding a certain value. Under the condition that the transformer runs in an overload mode, the temperature of the transformer reaches higher temperature, if the transformer runs for a long time, the insulating material in the transformer gradually loses the original mechanical property, the higher the temperature is, the faster the insulation aging is, the coil loses the protection of the insulating layer, and the transformer can be burnt in serious conditions.
In the operation process, a non-stop event of main transformer over-high temperature tripping caused by the full stop of the main transformer due to the main transformer external circulation fault of part of the power plant occurs, and an event of main transformer external circulation system non-starting caused by the switching of the auxiliary power and further causing over-high temperature tripping occurs in the power plant. When the temperature of the main transformer rises to exceed the allowable temperature of the operation rule, operation maintenance personnel need to carry out a series of field inspections, such as transformer load condition inspection, cooling medium temperature inspection, a temperature measurement device inspection, transformer external circulation operation condition inspection and the like.
The invention content is as follows:
the technical problems to be solved by the invention are as follows: the method is used for solving the technical problems that in the prior art, under a management mode of remote centralized control and few-person maintenance, due to the fact that no person is on duty on site, when the temperature of a main transformer is too high, a centralized control operator or an operation and maintenance operator cannot find abnormality and cannot intervene in the control of the main transformer in time, the operation condition of the main transformer is deteriorated, and the like.
The technical scheme of the invention is as follows:
a method of preventing abnormal shutdown of a hydroelectric power plant transformer, comprising:
step 1, preventing a main transformer of a main water power plant from being overloaded and being stopped due to exceeding temperature;
step 2, preventing the main transformer from being shut down due to overload of the interconnection transformer;
and 3, preventing the main transformer from being shut down due to temperature rise.
The method for preventing the main transformer of the main water power plant from being shut down due to overload and overproof temperature comprises the following steps of 1.1, optimizing a control loop, namely adding a self-holding loop in a main transformer external circulation control system to enable the main transformer external circulation to still normally operate after P L C fault or power failure and avoid the temperature rise of the main transformer caused by the main transformer external circulation fault, 1.2, early warning, namely judging the operation condition of a main transformer external circulation oil pump by a monitoring system, sending a main transformer external circulation full stop warning when a main transformer becomes high, a low-voltage side switch is switched on and the oil pump does not operate, setting a main transformer temperature rise primary warning, and carrying out the early warning before reaching a main transformer temperature rise warning fixed value to improve the response capability of operation and maintenance personnel.
Step 2, the method for preventing the main transformer from being shut down due to overload of the interconnection transformer comprises the following steps: step 2.1, delaying AGC (automatic gain control) withdrawal and delaying reduction of unit load to below the lower limit of a unit vibration area when line protection tripping, interconnection variable current or power out-of-limit, unit power larger than interconnection variable rated power, generator outlet circuit breaker closing, main transformer high-voltage side switch closing and automatic control function pressing plate are put into operation; step 2.2, when the unit is tripped due to an accident, the contact variable current or the power is out of limit, the breaker at the outlet of the generator is opened, the rotating speed of the unit is more than 60%, and the automatic control function pressure plate is put into the unit: and an automatic tangent line load function is executed, and the overload of the main transformer is avoided by cutting off the lines in turn.
Step 3, the method for preventing the shutdown caused by the temperature rise of the main transformer comprises the following steps: setting a main transformer external circulation control system for full stop alarm, and early warning in advance when the temperature of a main transformer rises; the method specifically comprises the following steps: before the temperature of the main transformer rises and does not reach the outlet trip temperature, the temperature of the main transformer is 45 ℃, and an auxiliary pump of the main transformer external circulation I is started; the temperature of the main transformer is 55 ℃, and an auxiliary pump of the main transformer external circulation II is started; the main transformer temperature is 65 ℃, and the signal is sent out by the protection of the transformer; the main transformer temperature is 75 ℃, and the transformer is tripped out in a protection way; when the upper oil temperature analog quantity of the transformer is more than 60 ℃ and the temperature of the main transformer is monitored by the protection of the transformer to be higher than 65 ℃, the signal action is delayed for 8min to press the load of the unit to be no-load; in order to avoid the conflict of the adjustment instruction with the AGC under the condition that the AGC is put into operation, the AGC of the unit is quitted 5 seconds before the pressure load is started to zero.
The invention has the beneficial effects that:
the method of the invention aims at abnormal working conditions which are easy to appear in operation, ensures that the external circulation of the main transformer cannot be stopped due to the disappearance of a P L C power supply or the switching of service power through a method of combining hardware and software, realizes the functions of external circulation full stop alarm, temperature rise early warning and the like, carries out intelligent treatment in advance when the temperature rises and does not reach the trip temperature, avoids the impact of the tripping and full charge of the main transformer, ensures the safe and stable operation of main equipment, and solves the technical problems that in the management mode of 'remote centralized control and few-person maintenance' in the prior art, when the temperature of the main transformer is overhigh, no abnormality is found by centralized control operators or operation and maintenance personnel, the main transformer control cannot be intervened in time, the main transformer operation condition is worsened and the like.
The specific implementation mode is as follows:
a method of preventing abnormal shutdown of a hydroelectric power plant transformer, comprising:
step 1, preventing a main transformer of a main water power plant from being overloaded and being stopped due to exceeding temperature;
the method for preventing the main transformer of the main water power plant from being shut down due to overload and overproof temperature comprises the following steps of 1.1, optimizing a control loop, namely adding a self-holding loop in a main transformer external circulation control system to enable the main transformer external circulation to still normally operate after P L C fault or power failure and avoid the temperature rise of the main transformer caused by the main transformer external circulation fault, 1.2, early warning, namely judging the operation condition of a main transformer external circulation oil pump by a monitoring system, sending a main transformer external circulation full stop warning when a main transformer becomes high, a low-voltage side switch is switched on and the oil pump does not operate, setting a main transformer temperature rise primary warning, and carrying out the early warning before reaching a main transformer temperature rise warning fixed value to improve the response capability of operation and maintenance personnel.
Step 2, preventing the main transformer from being shut down due to overload of the interconnection transformer;
step 2, the method for preventing the main transformer from being shut down due to overload of the interconnection transformer comprises the following steps: step 2.1, delaying AGC (automatic gain control) withdrawal and delaying reduction of unit load to below the lower limit of a unit vibration area when line protection tripping, interconnection variable current or power out-of-limit, unit power larger than interconnection variable rated power, generator outlet circuit breaker closing, main transformer high-voltage side switch closing and automatic control function pressing plate are put into operation; by reducing the load of the unit after the function is adopted, overload of contact is avoided.
Step 2.2, when the unit is tripped due to an accident, the contact variable current or the power is out of limit, the breaker at the outlet of the generator is opened, the rotating speed of the unit is more than 60%, and the automatic control function pressure plate is put into the unit: and an automatic tangent line load function is executed, and the overload of the main transformer is avoided by cutting off the lines in turn.
And 3, preventing the main transformer cavity from being shut down due to temperature rise.
Step 3, the method for preventing the shutdown caused by the temperature rise of the main transformer comprises the following steps: setting a main transformer external circulation control system for full stop alarm, and early warning in advance when the temperature of a main transformer rises; the method specifically comprises the following steps: before the temperature of the main transformer rises and does not reach the outlet trip temperature, the temperature of the main transformer is 45 ℃, and an auxiliary pump of the main transformer external circulation I is started; the temperature of the main transformer is 55 ℃, and an auxiliary pump of the main transformer external circulation II is started; the main transformer temperature is 65 ℃, and the signal is sent out by the protection of the transformer; the main transformer temperature is 75 ℃, and the transformer is tripped out in a protection way; the protection measures of the main transformer temperature are that an external circulation system is started to cool through temperature, the temperature rises to alarm and the temperature is over-high to trip.
When the upper oil temperature analog quantity of the transformer is more than 60 ℃ and the temperature of the main transformer is monitored by the protection of the transformer to be higher than 65 ℃, the signal action is delayed for 8min to press the load of the unit to be no-load; in order to avoid the conflict of the adjustment instruction with the AGC under the condition that the AGC is put into operation, the AGC of the unit is quitted 5 seconds before the pressure load is started to zero.
Claims (1)
1. A method of preventing abnormal shutdown of a hydroelectric power plant transformer, comprising:
step 1, preventing a main transformer of a main water power plant from being overloaded and being stopped due to exceeding temperature;
the method for preventing the main transformer of the main water power plant from being shut down due to overload and over-standard temperature comprises the following steps of 1.1, optimizing a control loop, namely adding a self-holding loop in a main transformer external circulation control system to enable the main transformer external circulation to still normally operate after a P L C fault or power failure and avoid the temperature rise of the main transformer caused by the main transformer external circulation fault, 1.2, early warning, namely judging the operation condition of a main transformer external circulation oil pump by a monitoring system, and sending a main transformer external circulation full stop warning when a main transformer external circulation oil pump is switched on, a low-voltage side switch is switched on and the oil pump is not operated, setting a main transformer temperature rise primary warning, and carrying out the early warning before reaching a main transformer temperature rise warning fixed value to improve the response capability of operation and maintenance;
step 2, preventing the main transformer from being shut down due to overload of the interconnection transformer;
step 2, the method for preventing the main transformer from being shut down due to overload of the interconnection transformer comprises the following steps: step 2.1, delaying AGC (automatic gain control) withdrawal and delaying reduction of unit load to below the lower limit of a unit vibration area when line protection tripping, interconnection variable current or power out-of-limit, unit power larger than interconnection variable rated power, generator outlet circuit breaker closing, main transformer high-voltage side switch closing and automatic control function pressing plate are put into operation; step 2.2, when the unit is tripped due to an accident, the contact variable current or the power is out of limit, the breaker at the outlet of the generator is opened, the rotating speed of the unit is more than 60%, and the automatic control function pressure plate is put into the unit: the automatic tangent line load function is executed, and the overload of the main transformer is avoided by cutting off the lines in turn;
step 3, preventing the main transformer from being shut down due to temperature rise;
step 3, the method for preventing the shutdown caused by the temperature rise of the main transformer comprises the following steps: setting a main transformer external circulation control system for full stop alarm, and early warning in advance when the temperature of a main transformer rises; the method specifically comprises the following steps: before the temperature of the main transformer rises and does not reach the outlet trip temperature, the temperature of the main transformer is 45 ℃, and an auxiliary pump of the main transformer external circulation I is started; the temperature of the main transformer is 55 ℃, and an auxiliary pump of the main transformer external circulation II is started; the main transformer temperature is 65 ℃, and the signal is sent out by the protection of the transformer; the main transformer temperature is 75 ℃, and the transformer is tripped out in a protection way; when the upper oil temperature analog quantity of the transformer is more than 60 ℃ and the temperature of the main transformer is monitored by the protection of the transformer to be higher than 65 ℃, the signal action is delayed for 8min to press the load of the unit to be no-load; in order to avoid the conflict of the adjustment instruction with the AGC under the condition that the AGC is put into operation, the AGC of the unit is quitted 5 seconds before the pressure load is started to zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810398069.2A CN108462174B (en) | 2018-04-28 | 2018-04-28 | Method for preventing abnormal shutdown of hydraulic power plant transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810398069.2A CN108462174B (en) | 2018-04-28 | 2018-04-28 | Method for preventing abnormal shutdown of hydraulic power plant transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108462174A CN108462174A (en) | 2018-08-28 |
| CN108462174B true CN108462174B (en) | 2020-07-28 |
Family
ID=63236261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810398069.2A Expired - Fee Related CN108462174B (en) | 2018-04-28 | 2018-04-28 | Method for preventing abnormal shutdown of hydraulic power plant transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108462174B (en) |
-
2018
- 2018-04-28 CN CN201810398069.2A patent/CN108462174B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| "小型水电站变压器安全运行研究";杨莹彤;《浙江水利水电专科学校学报》;20081231;第20卷(第4期);第10-13页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108462174A (en) | 2018-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101936258B (en) | A wind power plant predictive protection circuit | |
| CN110571761B (en) | Generation and transformation group protection method applied to international nuclear power million units | |
| US20170025849A1 (en) | Controlled Switching Devices and Method of Using the Same | |
| EP1782517B1 (en) | Device for the safe isolation of a nuclear power plant from a supply mains during a mains failure | |
| CN105140889A (en) | Inverter over-current protection circuit | |
| CN103633636A (en) | Lightning arrester degradation protection device | |
| CN108462174B (en) | Method for preventing abnormal shutdown of hydraulic power plant transformer | |
| CN113113937B (en) | Excitation system of hydropower station black start unit and grid-connected signal input and removal method | |
| CN204992611U (en) | Photovoltaic contravariant single phase alternating current and box with a net | |
| CN103825509A (en) | Device applied to startup and operation of high-power motors | |
| CN210780209U (en) | Electric emergency gate operation system | |
| CN112865180B (en) | Flexible grid-connected auxiliary device of power transformer | |
| CN110752664A (en) | Dual-power-supply fast switching device | |
| CN206135749U (en) | Triangle -shaped start control circuit | |
| RU2550154C2 (en) | Method for control of tap changer under load for forced excitation circuit, respective unit and forced excitation circuit with this unit | |
| CN106230023A (en) | The upper off line power method for automatically regulating of a kind of industrial power plant | |
| CN106368892A (en) | Control method for emergency shutdown operating under protection of hydropower station hydraulic machinery | |
| CN204013306U (en) | A kind of generator excitation adjusting device and generator system | |
| CN112865175A (en) | FCB operation method of garbage power plant | |
| CN111799762A (en) | Wind turbine generator set and method for preventing engine room of fan from being on fire | |
| CN219372016U (en) | Excitation surge current suppression system | |
| CN112821371B (en) | Flexible breaking and network breaking auxiliary device | |
| CN210956555U (en) | Novel electric loop thermal relay reset circuit | |
| CN100570976C (en) | The method that the anti-line voltage of enterprise's electric equipment moment fluctuates widely and disturbs | |
| CN215009968U (en) | Motor protection structure of tamping tool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200728 Termination date: 20210428 |