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DL/T 1974-2019: (Hydropower plant DC system technical conditions)
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(Hydropower plant DC system technical conditions)
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DL/T 1974-2019
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Basic data | Standard ID | DL/T 1974-2019 (DL/T1974-2019) | | Description (Translated English) | (Hydropower plant DC system technical conditions) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F20 | | Word Count Estimation | 14,185 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | DL/T 1974-2019: (Hydropower plant DC system technical conditions)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Specification of DC auxiliary system for hydropower plant
ICS 27.140
F 20
People's Republic of China Electric Power Industry Standard
Technical conditions of DC system of hydropower plant
Refractory materials for boilers in thermal power plants
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Working conditions...3
5.General regulations...3
6 Functions and technical parameters...5
7 Installation...10
8 Test...10
Foreword
This standard is based on GB/T 1.1-2009 "Guidelines for Standardization Part 1.Standard Structure and Compilation"
Rules compiled.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Electric Power Industry Hydropower Station Automation Standardization Technical Committee.
Drafting organizations of this standard. Guangdong Power Grid Co., Ltd. Electric Power Research Institute, Datang Sichuan Power Generation Co., Ltd.
Participants of this standard. Shandong Shengyang Power Co., Ltd., Sichuan Areva Electric Co., Ltd., Guangzhou Qianshun
Electronic Equipment Co., Ltd., Zhuhai Yituo Technology Co., Ltd.
The main drafters of this standard. Mei Chenglin, Chen Xun, He Shengli, Zeng Guangyi, Yang Zhongliang, Zeng Yanping, Feng Lei, Zeng Jie, Liu Weizhang
Wei Huang Qingsong Li Dehua Kong Delong Wang Zhiyu
The opinions and suggestions during the implementation of this standard are fed back to the Standardization Center of the China Electricity Council (Xuanwu, Beijing)
No. 1, Er Tiao, Baiguang Road, District, 100761)
This standard is issued for the first time.
Technical conditions of DC system of hydropower plant
1 Scope
This standard specifies the function, performance, installation, test and other requirements of the DC system of hydropower plants.
This standard applies to DC power supplies for measurement, control, operation, protection, accident lighting, etc. of hydropower plants.
2 Normative references
The following documents are essential for the application of this document. For dated reference documents, only the dated version applies
In this document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 17478 Performance characteristics of low-voltage DC power supply equipment
GB/T 19638 fixed valve-regulated lead-acid battery
GB/T 19826 General technical conditions and safety requirements for DC power supply equipment in power engineering
GB/T 2900.1 Basic terminology for electrical engineering
GB/T 2900.41 Electrician terminology primary batteries and accumulators
GB/T 2900.77 Electrotechnical terminology, electrical and electronic measurement and instrumentation-Part 1.General terminology for measurement
DL/T 329 Communication interface of low-voltage power supply equipment in substation based on DL/T 860
DL/T 459 Power system DC power supply cabinet ordering technical conditions
DL/T 724 Technical specification for operation and maintenance of battery DC power supply device for power system
DL/T 781 High frequency switch rectifier module for power
DL/T 856 DC power supply monitoring device for electric power
DL/T 1392 DC power supply system insulation monitoring device technical conditions
DL/T 5044 Technical Specification for Design of DC Power Supply System in Power Engineering
DL/T 5186 Code for electromechanical design of hydroelectric power plants
3 Terms and definitions
3.1
Constant current charge
Refers to a charging method that maintains a constant charging current within the charging voltage range.
3.2
Constant voltage charge
Refers to a charging method that maintains a constant charging voltage within the range of charging current.
3.3
Constant-current limit voltage charge
First charge in constant current mode, when the battery terminal voltage rises to the limit voltage value, the charging device automatically converts to constant voltage
Charge until the charge is complete.
3.4
Floating charge
The charging device supplements the self-discharge charging method of the battery with a constant voltage and bears the regular load at the same time.
3.5
Equalizing charge
In order to compensate for the uneven voltage of the battery during use, it is charged with a specified constant voltage.
3.6
Supplementary charge
To compensate for the capacity reduction of the battery due to self-discharge during storage or the charging after large-capacity discharge is called supplementary charging
Electricity.
3.7
Constant-current discharge
During the discharging process of the battery, the discharge current value remains unchanged until it reaches the specified end voltage.
3.8
Checking discharge
The battery pack in normal operation is discharged at a constant current with the specified discharge current. When one of the single cells reaches
The specified discharge termination voltage is stopped, and the actual capacity is calculated based on the discharge current and discharge time, which is called verification
Sexual discharge.
3.9
Current unbalance
The degree of difference in load current between charging modules. Under the condition of total output (30%～100%) rated current, press the following formula
Formula calculation.
β-current unbalance degree; I-the limit value of the output current of the measured module; IP-the average of the output current of the N working modules
Value; IN-the rated current value of the module.
3.10
Insulation monitoring device for DC power system
Monitor the insulation status of the DC bus of the DC system to the ground, reflect the ground resistance value of the positive and negative poles of the DC bus, and be able to locate the connection
A device with functions such as on-line monitoring and alarming of the ground fault branch and calculating the ground resistance value of the fault branch.
4 Working conditions
4.1 Operating environment
4.1.1 The altitude does not exceed.2000m, and the atmospheric pressure ranges from 80kPa to 110kPa;
4.1.2 The operating environment temperature of charging screen and power feeding screen equipment is not higher than 40℃ and not lower than -10℃;
4.1.3 The fixed valve-regulated lead-acid battery should be able to be used normally under the ambient temperature of -10℃～45℃ (recommended
The temperature is 15℃～30℃);
4.1.4 The relative humidity is 5%-95% (no condensation);
4.1.5 There is no strong vibration and impact, no explosion hazard and conductive medium in the air, no corrosion of metals and damage to insulation
The presence of harmful gases, etc.;
4.1.6 The vertical inclination of the installation should not exceed 5 degrees.
4.2 Input power requirements
4.2.1 The frequency change range does not exceed ±2%.
4.2.2 AC input voltage fluctuation range (85%～120%)Un.
4.2.3 The asymmetry of AC input voltage should not exceed 5%.
4.2.4 The AC input voltage should be a sine wave, and the non-sine content should not exceed 10% of the rated value.
5.General rules
5.1 General requirements
5.1.1 The nominal voltage of the DC system is 220V and 110V.
5.1.2 In the case of floating charge operation, the DC system bus voltage should be 105% of the nominal voltage.
5.1.3 In the case of equalizing charging operation, it shall meet.
a) The voltage of the control bus should not be higher than 110% of the nominal voltage of the DC system;
b) The voltage of the power bus should not be higher than 112.5% of the nominal voltage of the DC system;
c) For the DC system where the control bus and the power bus are combined, the bus voltage should not be higher than 110% of the nominal voltage;
5.1.4 According to the needs of use, the DC system can be equipped with sub-feed screens in different areas; when the DC load power supply distance is long,
An independent DC system should be configured.
5.1.5 In addition to the fuse used at the outlet of the battery, the DC circuit should adopt a DC circuit breaker with automatic tripping function.
5.1.6 When the charging device is not working, the accident discharge time that the battery pack should withstand is calculated as 1h. At the end of the accident discharge,
The outlet voltage of the battery pack should not be lower than 87.5% of the nominal voltage of the DC system.
5.1.7 The communication interfaces of the monitoring unit, insulation monitoring device and battery monitoring device adopt RS485 or Ethernet.
5.1.8 In order to prevent long-term storage or undercharging of the battery due to improper setting of floating charge voltage, it is necessary to supplement the battery pack.
Electricity. Supplementary charging method. set the time (usually 3 months) to automatically or manually perform a constant current charge on the charging device
→ Constant voltage charging → Floating charging process, so that the battery has full capacity.
5.2 Operation mode
5.2.1 For a DC system with two-segment single bus wiring, the two-segment bus should operate independently. There should be a contact switch between the bus bars.
5.2.2 The DC system should adopt an ungrounded method.
5.2.3 When the control bus is separated from the power bus, the control load is connected to the control bus, and the power load is connected to the power bus.
There should be automatic and manual pressure regulating devices between the load and the control bus.
5.3 DC load
According to the nature, the DC load of hydropower plants can be divided into regular load, accident load and shock load.
5.3.1 Regular load
1) Unit control system;
2) Relay protection device;
3) Speed control system control;
4) Excitation system control;
5) Monitoring and control of switchyard equipment;
6) Water inlet and flood gate control;
7) Auxiliary system control;
8) Others.
5.3.2 Accident load
1) Emergency lighting.
2) AC uninterruptible power supply system (when the DC system is connected to the AC uninterruptible power supply system);
3) Others.
5.3.3 Shock load
1) Circuit breaker control;
2) DC oil pump;
3) DC excitation of the excitation system;
4) Others.
6 Function and technical parameters
6.1 Overall function of charging device
6.1.1 The maximum output voltage should be greater than the maximum allowable operating voltage of the battery pack.
6.1.2 The output current should meet the requirements of battery charging (including equalization charging and floating charging) and normal DC load power supply.
6.1.3 The following requirements shall be met.
a) Stabilization accuracy. ≤±0.5% (when 0%～100% output rated current);
b) Steady current accuracy. ≤±1% (when 20%～100% output rated current);
c) Ripple coefficient. ±0.5% (under 30%～100% rated current conditions);
d) Unbalance of current sharing. ≤±5% (under 20%～100% rated load condition).
6.1.4 When the ambient temperature deviates from 25°C, it should have the function of automatically adjusting the battery float voltage.
6.1.5 After the AC power failure is restored, the battery discharge capacity exceeds the set value, the battery voltage is lower than the set value,
When the power outage exceeds any of the conditions in the set time, the charging device should be able to perform equalizing charging of the battery pack.
6.1.6 It shall have the conversion function of manual and automatic floating charge and equalizing charge.
6.1.7 When the floating charge operation time exceeds the set value, it should be able to control the automatic transfer from floating charge to equalizing charge.
6.1.8 When the charging current is less than the set value during equalizing charge, it should be able to control the automatic transfer from equalizing charge to floating charge.
6.1.9 When the equalization charging time exceeds the set value, it should have the function of controlling the charging module to switch to floating charging.
6.2 Performance of main components of charging device
6.2.1 Charging module
6.2.1.1 It shall comply with the regulations in DL/T 781 "High Frequency Switch Rectifier Module for Electric Power".
6.2.1.2 Each module should display the output voltage/current value. When the monitoring unit exits operation, the charging device should remain floating.
Full state. During normal operation, the module should communicate with the monitoring unit and accept the instructions of the monitoring unit. Abnormal signals should be sent to the monitor
Control unit.
6.2.1.3 The rated current of the module should be 10A, 20A, 30A, 40A.
6.2.2 Monitoring unit
6.2.2.1 It shall meet the requirements in DL/T 856 "DC Power Supply Monitoring Device for Electric Power".
6.2.2.2 The monitoring unit can be integrated with the insulation monitoring device and the battery monitoring device in one device.
6.2.2.3 It shall have the function of communicating with the insulation monitoring device and the battery monitoring device, as well as the computer monitoring system of the plant
Communication function.
6.2.2.4 When the following events occur, an alarm signal should be given to the factory station computer monitoring system, and a sound and light signal should be sent out.
1) Abnormal AC input;
2) Abnormal DC output;
3) DC system busbar or branch circuit to ground insulation failure;
4) Abnormal operation of the battery;
5) Others.
6.2.2.5 It should have a self-diagnostic function. When a fault occurs, an alarm signal will be sent to the computer monitoring system of the plant.
6.2.2.6 It shall have the function of event recording, and store no less than 1000 event records, which shall include the start time
And the end time, and the data will not be lost after power failure. Incidents include the following.
1) Modification of operating parameters;
2) Various fault alarms of DC system;
3) The DC system failure alarm disappears;
4) Floating charge and equalizing charge conversion;
5) Others.
6.2.2.7 It shall have operation password and management functions.
6.2.2.8 It should have a time synchronization function.
6.2.2.9 The switching state of the main DC circuit should be monitored.
6.2.3 Insulation monitoring device
6.2.3.1 It shall meet the requirements in DL/T 1392 "Technical Conditions of Insulation Monitoring Devices for DC Power Supply Systems".
6.2.3.2 Each section of DC bus should be equipped with insulation monitoring device.
6.2.3.3 The insulation monitoring device shall have real-time monitoring and display of DC system bus voltage, bus-to-ground voltage, bus-to-ground
Insulation resistance, insulation resistance of each branch to ground, etc.;
6.2.3.4 When the following events occur, an alarm signal should be sent to the monitoring unit, along with an audible and visual signal.
1) The DC bus voltage is abnormal;
2) The voltage of the DC bus to ground is abnormal;
3) Abnormal bus-bar insulation to ground;
4) Abnormal ground insulation of branch circuit;
5) Two-section DC system ring network;
6) AC flees into the DC system;
7) Others.
6.2.3.5 It shall have the function of event recording, and store no less than 1000 event records, which shall include the start time
And the end time, and the data will not be lost after power failure. Incidents include the following.
1) Modification of operating parameters;
2) DC system ground fault alarm;
3) The DC system ground fault disappears;
4) Others.
6.2.3.4 The insulation monitoring device adopting the principle of leakage current detection has the function of prohibiting the input of the bridge resistance when it alarms.
6.2.3.5 When two sets of insulation monitoring devices using the principle of leakage current detection need to be operated in parallel, one of them can be manually exited
The insulation monitoring device balances the bridge resistance and detects the function of the bridge resistance grounding point.
6.2.4 DC circuit protection
6.2.4.1 Protective appliances include fuses and DC circuit breakers.
6.2.4.2 The rated voltage of the protective appliance should be greater than or equal to the highest working voltage of the circuit.
6.2.4.3 The protection of electrical appliances should consider the level difference coordination between the upper and lower levels according to the action characteristics.
6.2.4.5 The DC circuit breaker shall have instantaneous current quick-break and inverse time overcurrent protection, but when it does not meet the selective protection coordination,
Can add short delay current quick-break protection.
6.2.4.5 Protective electrical appliances should not be accidentally tripped or damaged under the following conditions.
1) When the circuit breaker is tripped and closed;
2) When the motor starts and runs normally;
3) During accidental discharge;
4) Under other non-overload and short-circuit conditions;
5) Others.
6.2.4.6 The interrupting capacity of the protective electrical appliances shall meet the requirements of short-circuit current and dynamic thermal stability of the DC system.
6.2.4.8 The fuse should have an alarm contact, which can directly send the fault signal to the factory station computer monitoring system without the monitoring unit.
6.2.4.9 The DC circuit breaker of the main circuit should have an alarm contact, preferably an auxiliary contact, and the fault signal and status signal
The number is sent to the monitoring unit.
6.2.5 Pressure regulating device
6.2.5.1 For DC systems where the power bus and the control bus are not combined, a voltage regulating device can be used for voltage regulation.
The device should adopt a pressure reducing silicon chain;
6.2.5.2 The rated current of the step-down silicon chain shall meet the requirements of the maximum continuous load current of the circuit where it is located, and shall be able to withstand the impact current
The short-term overload and the ability to withstand reverse voltage.
6.2.5.3 The pressure-reducing silicon chain shall have automatic and manual pressure regulating functions.
6.2.6 Measuring meter
6.2.6.1 The screen cabinet of the charging device should be equipped with AC input voltage, DC output voltage and current measuring meters. Storage battery can be installed
Measuring meters for cell group voltage and current.
6.2.6.2 The DC distribution screen should be equipped with DC voltage and current meters.
6.2.7 Battery monitoring device
6.2.7.1 The battery monitoring device shall have the function of monitoring and displaying the voltage of each single cell, the voltage of the entire battery, and the ambient temperature.
Yes, it should have the function of monitoring and displaying the internal resistance (or conductance) of each single-cell battery, and may have the ability to display the current battery pack charge
Function.
6.2.7.2 When the following events occur, an alarm signal should be sent to the monitoring unit, along with an audible and visual signal.
1) The total voltage of the battery pack is abnormal;
2) Abnormal cell voltage;
3) Abnormal ambient temperature;
4) Abnormal internal resistance of the monomer (if any);
5) The connection bar is abnormal (if any);
6) Others.
6.2.7.3 It shall have the function of event recording, and store no less than 1000 event records, which shall include the start time
And the end time, and the data will not be lost after power failure. Incidents include the following.
1) Modification of operating parameters;
2) Battery failure alarm;
3) The battery failure disappeared;
4) Others.
6.2.7.4 The battery voltage inspection instrument does not have the function of internal resistance (or conductance) monitoring and shall comply with DL/T 1397.1 "Electricity Direct
General technical requirements of test equipment for current power supply system Part 1.Requirements of battery voltage inspection instrument.
6.2.7.5 When measuring the same fully charged battery several times successively, the internal resistance of several measurements should be consistent.
6.2.7.6 It should have a time synchronization function.
6.2.7.7 Each monitoring circuit of the battery shall be equipped with fuses.
6.2.7.8 The battery monitoring device should have a data communication interface, and should have a data export function. The exported data includes but not limited to
It depends on the battery voltage, single battery voltage, floating charge current, battery ambient temperature, and battery internal resistance.
6.3 Technical requirements for batteries
6.3.1 A fixed valve-regulated lead-acid battery should be used. After technical and economic demonstration, fixed exhaust type lead-acid storage can also be used
Battery, lead-carbon battery or lithium iron phosphate battery.
6.3.2 Fixed valve-regulated lead-acid batteries should meet the technical requirements of GB/T 19638 "Fixed valve-regulated lead-acid batteries".
6.3.3 Floating charge and equalizing charge voltage should be selected according to the recommended value of the manufacturer’s manual. When there is no product information, the fixed valve control
The float charge voltage value of the single lead-acid battery should be 2.23V～2.27V.
6.3.4 The number of batteries in each group shall meet the following requirements at the same time.
a) The floating charge voltage and equalizing charge voltage of each battery are within the normal range;
b) The voltages of the power bus, control bus and battery outlet are all within the allowable range. The power bus and control bus
Refer to the requirements of 5.1 in this standard for the voltage range;
c) See Table 1 for the number of batteries in the battery pack.
6.3.5 The capacity of the newly installed battery should meet the requirements of Table 2.
Table 2 Capacity of newly installed batteries
Battery type Nominal voltage (V) End-of-discharge voltage (V) Rated capacity (Ah) Discharge current (A)
Vented lead-acid battery 2 1.8 C10 I10
Fixed valve-regulated lead acid
Battery
2 1.8 C10 I10
6 5.4 C10 I10
12 10.8 C10 I10
Note 1.C10 is the battery capacity symbol, which is the 10h rate rated capacity, Ah;
Note 2.I10 is the symbol of discharge current, it is the discharge current at a rate of 10h, the value is C10/10, A.
6.3.6 After running for a period of time, when the capacity of an individual or a small amount of battery is lower than 80% of the rated capacity, exit in time and take necessary measures.
Take measures to deal with.
6.3.7 The whole set of batteries newly put into operation should be of the same brand and batch.
6.3.8 The closing impulse discharge capacity should comply with GB/T 19826 "General technical conditions and safety requirements for DC power equipment in power engineering
The requirements in
7 Installation
7.1 DC screen installation
7.1.1 The DC screen includes a charging screen and a power feeding screen, which are installed in a cabinet structure.
7.1.2 The size and color of the DC screen cabinet should be consistent with other devices at the installation site, and the protection level should not be lower than IP31.
Claim.
7.1.3 The DC panel cabinet shall have sufficient strength and rigidity, and shall be able to withstand the dynamic and thermal stability caused by the installed components and the short circuit.
At the same time, the performance will not be affected by installation and transportation.
7.1.4 The bottom of the screen should be equipped with a grounding copper bar of not less than 25×4mm2, and a copper wire shall be used to lead to the grounding grid and be reliably grounded.
7.1.5 The components and terminals of the DC screen should be neatly arranged, clearly arranged, and not overlapping, so as to facilitate maintenance and disassembly.
7.1.6 Separating measures shall be provided for the DC positive wiring and negative wiring on the terminal block in the DC screen.
7.1.7 The door of the screen cabinet should be opened and closed flexibly, and the door and the cabinet should be reliably connected by multiple strands of soft copper wire.
7.1.8 The top plate of the DC screen should be equipped with a lighting device, which can be opened and closed automatically or manually. DC cabinet, especially charging cabinet should be installed
The heater can be switched on manually or automatically through the thermostat.
7.1.9 The insulation resistance of the bus bar and the low voltage bus in the DC screen to the ground should not be less than 10MΩ.
7.2 Battery pack installation
7.2.1 The fixed valve-regulated lead-acid battery with a capacity of more than 300Ah shall be equipped with a dedicated battery room. Dedicated battery room
The battery inside should be installed with a bracket.
7.2.2 The installation of storage b...
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