DL/T 1073-2019General specifications for high speed transfer equipment for the power supplies for auxiliary equipment in power plant (English PDF)

4.1 Environmental conditions

4.1.1 Normal working atmospheric conditions

The normal working atmospheric conditions of the device are as follows.

a) Ambient temperature. -10°C~+55°C;

b) Relative humidity. 5%~95% (there is neither condensation nor freezing inside the device);

c) Atmospheric pressure. 80kPa~106 kPa.

4.1.2 Normal test atmospheric conditions

The normal test atmospheric conditions of the device are as follows.

a) Ambient temperature. 15°C~35°C;

b) Relative humidity. 45%~75%;

c) Atmospheric pressure. 86 kPa~106 kPa.

4.1.3 Standard atmospheric conditions for benchmark tests

The standard atmospheric conditions for the device benchmark test are as follows.

a) Ambient temperature. 20°C±2°C;

b) Relative humidity. 45%~75%;

c) Atmospheric pressure. 86kPa~106kPa.

4.1.4 Environmental conditions for storage and transportation

a) The allowable ambient temperature for storage of the device is -25°C~55°C; the relative humidity is not more than 85%;

b) The allowable ambient temperature for transportation of the device is -25°C~70°C, and the relative humidity is not more than 85%.

When the storage and transportation environmental conditions exceed the above range, the user and the manufacturer shall negotiate.

4.1.5 Surrounding environment

The working environment requirements of the device should meet.

a) It should be shaded, protected from rain and snow, protected from lightning, sand and dust, and ventilated;

b) The electromagnetic environment should meet the requirements of 4.12;

c) No vibration exceeding the severity level of GB/T 11287-2000 specified in GB/T 11287-2000, and no vibration exceeding GB/T an earthquake with an intensity of VII specified in 17742-2008; during transportation and storage, no severeness exceeding GB/T 14537 has occurred Class 1 vibration;

d) Non-explosive medium, the surrounding medium should not contain any medium that can corrode metal, damage insulation, surface plating and coating.

Conductive medium, no obvious water vapor, no serious mold, no strong light source;

e) All reliable grounding points at the installation site shall comply with the provisions of 5.8 in GB/T 2887-2011.

4.2 Rated electrical parameters

4.2.1 DC power supply

The DC power requirements of the device are as follows.

a) Rated voltage. 220V, 110V;

b) Allowable deviation. -20%~+15%;

c) Ripple coefficient. not more than 5%.

4.2.2 AC circuit

The requirements for the AC circuit of the device are as follows.

a) AC voltage rating UN. 100V, 100/3 V;

b) AC current rating IN. 1A; 5A;

c) Rated frequency fN. 50Hz.

4.3 Power consumption

The power consumption requirements of the device are as follows.

a) AC current loop. when the rated current is 5 A, each phase is not more than 0.75 VA;

When the rated current is 1 A, each phase is not more than 0.5 VA;

b) AC voltage circuit. when rated voltage, each phase is not more than 0.5 VA;

c) DC power circuit. when working normally, not more than 30W;

When the device is operating, it is not more than 50W.

4.4 Overload capacity

4.4.1 Requirements for overload capacity

The overload capacity requirements of the device shall meet the requirements of 4.6 in DL/T 478-2013.

4.4.2 Evaluation criteria for overload capacity

After the device is subjected to overcurrent or overvoltage, there should be no insulation damage, liquefaction, carbonization or scorching, etc. The relevant electrical performance should meet 4.5 Requirements.

4.5 Accuracy and variation

The accuracy and variation requirements of the device are as follows.

a) Phase measurement error. the absolute error does not exceed ±1°;

b) Frequency measurement error. the absolute error does not exceed ±0.03Hz.

The accuracy and variation requirements of other measuring components in the device should meet the requirements of DL/T 478-2013 in 4.3.

4.6 Requirements for wiring terminals, output relays and signal relays

The wiring terminals, output relays and signal relays of the device shall meet the requirements of 4.4, 4.5.3, and 4.5.4 in DL/T 478-2013.

4.7 Main functions of the device

4.7.1 The device should have the following starting methods.

a) Manual start mode, including local start and remote start;

b) The accident start mode is started by an external protection device;

c) Abnormal starting methods, including bus low-voltage starting and operating circuit breaker start.

4.7.2 In the manual start mode, the device shall have a two-way switching function.

4.7.3 In the accident start or abnormal start mode, the device should only have a single direction switch from the working power source to the standby power source.

4.7.4 The device should be able to automatically lock the switching function after performing a switching action. After the device is manually reset, the next switching can be performed.

4.7.5 In manual starting mode, the device shall have three switching modes. parallel switching, simultaneous switching and series switching.

4.7.6 In the accident start and bus low-voltage start mode, the device shall have two switching modes. simultaneous switching and series switching.

4.7.7 The device shall provide five switching judgment conditions. parallel switching criterion, fast switching, in-phase switching, residual voltage switching and long delay switching.

4.7.8 The device should have a decoupling function to prevent the two power sources from being paralleled for a long time to form a circulating current when they are connected in parallel or switched simultaneously.

4.7.9 The device should have a post-acceleration protection function, which can accelerate the tripping of the target power circuit breaker when the target power source is switched to the faulty bus.

4.7.10 The device should have a phase angle compensation function to compensate for the working power or backup power caused by the difference in the voltage collected by the device the initial angular difference between the voltage and the bus voltage.

4.7.11 The device shall be equipped with an alarm for abnormal position of the circuit breaker, an alarm for the loss of DC power, an alarm for bus TV disconnection, and an alarm for low-voltage target power supply police.

4.7.12 When the circuit breaker position is abnormal and the busbar TV is disconnected, the device should be locked and switched; when the target power supply voltage is low, the device should be locked and switched.

4.7.13 The device should be equipped with an opening contact for lock switching and an outlet contact for acceleration protection after starting, for cooperation with protection or automatic devices.

4.7.14 The starting voltage value of the circuit breaker position input, accident switching input and manual start switching input should not be greater than 0.7 times the rated voltage Value, not less than 0.55 times the rated voltage.

4.7.15 The device should provide Chinese display interface and Chinese menu.

4.7.16 The device should be equipped with hardware and software monitoring functions to automatically monitor the hardware and software working status. When the device is abnormal or faulty, the device should be able to Automatically take measures such as alarm, self-reset, and lock switch functions and record the abnormal fault information found.

4.7.17 All kinds of important record information of the device, including fixed value, action event information and accident record, will not be recorded in the case of loss of DC power.

Should be lost.

4.7.18 The device shall have a fault recording function and shall meet the following requirements.

a) The device should be able to reliably record the relevant information of the action, such as the input analog quantity and switch quantity, output switch quantity, action element, Action time, etc., and has the function of storing no less than 8 fault record data; each action report should include the action of each action element Make the data of the first 2 cycles and the 6 cycles after the action;

b) The fault recorder data recorded by the device should be output in the format specified in GB/T 14598.24-2017;

c) The device should have the function of displaying and printing record information, providing protection action information for understanding the situation and handling accidents; providing analysis the basis for accidents and protective actions.

4.7.19 The device should be equipped with a debugging interface and auxiliary software, with functions such as communication and maintenance, fixed value setting, fault recording and analysis, and debugging.

4.7.20 The device should be equipped with an interface capable of communicating with the automation system. The communication data format of the communication interface should follow a unified protocol, adopt GB/T 19582.1-2008, DL/T 667 or DL/T 860 series standard communication protocol. The manufacturer shall declare the communication protocol, communication Type of communication medium and equipment used for communication.

4.7.21 Device clock and time synchronization function.

a) The device should be equipped with a hardware clock circuit. When the device loses power or loses an external clock source, the clock circuit should be able to work normally and have a guard Time function

b) The device should be equipped with a time synchronization interface with an external standard time service source. It is recommended to use IRIG-B in accordance with IEEE std 1344-1995 (DC) Time code; network time can also be used.

4.8 Main technical requirements for various functions

4.8.1 Accuracy of setting

The accuracy of the setting should meet the following conditions.

a) Frequency setting. allowable error is not more than 0.03Hz;

b) Phase setting. allowable error is not more than 1°;

c) Voltage setting. allowable error is not more than 2.5% or not more than 1% UN;

d) Current fixed value. allowable error is not more than 2.5% or ±0.02IN;

e) Time setting. allowable error is not more than 1% or not more than 40ms.

4.8.2 Bus low voltage start switch

The following conditions should be met.

a) The busbar TV should be prevented from being disconnected, causing the busbar to start by low voltage;

b) The return coefficient is not greater than 1.05.

4.8.3 Device action time during fast switching

The time from the opening of the working circuit breaker to the closing of the relay contact of the standby circuit breaker of the device is not more than 15ms.

4.8.4 Conditions for same phase switching

When the target power circuit breaker is closed, the phase difference between the bus residual voltage and the target power voltage is less than 30°.

4.8.5 Resolution of sequence of events

Not more than 2ms.

4.8.6 Clock accuracy

The timing error should not be greater than 1ms. When the time synchronization signal disappears, the device's own clock is used, and the 24h error is not more than 5s.

4.9 Safety requirements

The safety performance of the device should meet the requirements of GB/T 14598.27-2017.

4.10 Insulation performance

4.10.1 Insulation resistance

Under the atmospheric conditions of the reference test, the external live circuit part of the device (except the communication interface circuit) and the exposed non-charged metal part and Between the shells, and between the circuits that are not electrically connected, use a 500V DC megger to measure the insulation resistance value, which should not be less than 100Mohm.

4.10.2 Dielectric strength

The dielectric strength should meet.

a) Under the atmospheric conditions of the reference test, the device should be able to withstand a power frequency withstand voltage test with a frequency of 50 Hz and a duration of 1 min without breakdown or flash.

Damage to the network and components;

b) The power frequency test voltage value is selected according to Table 1, or DC test voltage can be used, and its value should be the specified power frequency test voltage value 1.4 times;

c) During the test, when a voltage is applied to any circuit under test, the remaining circuits are connected to the ground with equal potential.

4.10.3 Impulse voltage

Refer to the test standard of GB/T 14598.3-2006, under the standard atmospheric conditions of the test, the DC power input circuit and AC the current input circuit, signal output contact and other circuits to the ground, and between the circuits, should be able to withstand the short-term impact of the standard lightning wave of 1.2/50µs Voltage test. When the rated insulation voltage is greater than 63V, the open circuit test voltage is 5kV; when the rated insulation voltage is not greater than 63V, the open circuit the test voltage is 1kV. The performance of the device after the test should meet the requirements of 4.7 and 4.8.

4.11 Humidity and heat resistance

4.11.1 General requirements

According to the test conditions and use environment, choose one of the following two methods.

4.11.2 Constant heat and humidity

The device should be able to withstand the constant damp heat test specified in GB/T 2423.3-2016.The test temperature is +40°C±2°C, and the relative humidity is 93%±3%, the test duration is 48h. Within 2h before the end of the test, use a 500V DC megohmmeter to measure the the insulation resistance between the exposed non-charged metal parts and the shell, and between the circuits that are not electrically connected should not be less than 1.5Mohm;

The quality strength is not less than 75% of the dielectric strength test voltage amplitude specified in 4.10.2.

4.11.3 Alternating heat and humidity

The device should be able to withstand the alternating damp heat test specified in 10.5 of GB/T 7261-2016.The test temperature is high temperature. +40°C±2°C (use Outdoor products are 55°C±2°C), low temperature. +25°C±3°C, relative humidity is 95%, the test time is 2 cycles, each cycle at 24h. Within 2 hours before the end of the test, use a 500V DC megger to measure the exposed non-charged metal parts and the insulation resistance between the enclosures and between the circuits that are not electrically connected should not be less than 1.5Mohm, and the dielectric strength should not be less than 3.8.2 75% of the dielectric strength test voltage amplitude.

4.12 EMC performance

4.12.1 Radiated electromagnetic field immunity

The device should be able to withstand the severe radiated electromagnetic field immunity test specified in Chapter 6 of GB/T 14598.26-2015.During the test and after the test, the device performance indicators should meet the requirements of 4.7 and 4.8.

4.12.2 Electrical fast transient/burst immunity

The device should be able to withstand the electrical fast transient/pulse group immunity specified in Chapter 6 of GB/T 14598.26-2015 with a severity level of Class A During and after the test, the performance indicators of the device should meet the requirements of 4.7 and 4.8.

4.12.3 Slowly damped shock wave immunity

The device should be able to withstand the 1MHz and 100kHz slow damping shock wave immunity test specified in Chapter 6 of GB/T 14598.26-2015, During and after the test, the performance indicators of the device should meet the requirements of 4.7 and 4.8.

4.12.4 Electrostatic discharge immunity

The device should be able to withstand the electrostatic discharge immunity test with severity level 3 specified in Chapter 6 of GB/T 14598.26-2015.The test period During and after the test, the device performance indicators should meet the requirements of 4.7 and 4.8.

4.12.5 Surge (impact) immunity

The device should be able to withstand the surge of the test severity level specified in Chapter 6 of GB/T 14598.26-2015 as common mo...