NB/T 10284-2019Performance requirements and test methods of SPD intelligent monitoring devices (English PDF)

3.1 Terms and definitions

The following terms and definitions apply to this standard.

3.1.1 SPD intelligent monitoring device

It has the function of monitoring the working status and operating parameters of the SPD, and has a communication interface that can realize remote data transmission.

3.1.2 (Monitored) SPD action

The SPD changes from a high resistance state to a low resistance state, and the peak value of the surge current passing through the SPD is greater than the minimum value measured by the monitoring device.

Note 1.SPD action status information generally includes SPD action times and SPD action occurrence time.

Note 2. The interval between two SPD actions that can be monitored is declared by the manufacturer.

3.1.3 SPD performance degradation trend

SPD performance degradation trend SPD's operating performance has an undesirable and expected performance deviation trend.

3.1.4 Full current

The SPD is connected according to the manufacturer's instructions, and the effective value of the current flowing through the SPD under normal operating voltage.

3.1.5 Resistive leakage current

The SPD is connected according to the manufacturer's instructions. Under normal operating voltage, the peak value of the resistive component of the current flowing through the SPD.

3.1.6 SPD remote signaling status

When the SPD is installed normally, it directly or indirectly indicates the status of the SPD internal or external disconnector.

3.1.7 SPD connection status

The state of the SPD connected to the protected power system is used to characterize whether the SPD is effectively connected to the power system. The connected state includes disconnected or connected Two states.

3.1.8 Remote monitoring system

Connected to the monitoring device through the communication network, the working status and parameters of the SPD can be obtained remotely in real time, as well as the working status of the monitoring device and Parameter configuration, etc., with SPD failure analysis and alarm, real-time display, storage, query, and statistical analysis of monitoring data.

3.1.9 Surge current characteristic parameter

Including surge current peak value, wave front time, half peak time, unit energy and other parameters.

3.1.10 Conventional true value

When measuring the monitoring device under test, the value given by the previous standard is the measured value of the standard measuring device.

3.2 Abbreviations and symbols

4.1 Power supply

4.1.1 Communication type

It works with 50 Hz/60 Hz AC power supply, and the rated voltage is determined by the manufacturer according to user requirements.

4.1.2 DC type

It works with DC power supply, and the rated voltage is determined by the manufacturer according to user requirements.

4.2 Location

4.2.1 Indoor

4.2.2 Outdoor

The monitoring device is used without housing and outside buildings or shelters.

5.1 Indoor

5.1.1 Temperature range

Normal range. -5 °C~40 °C.

Note 1. This range corresponds to products installed in buildings that are not affected by weather without temperature and humidity control. Extended range. -40 °C~70 °C.

Note 2. This range corresponds to products installed outside buildings and used in places affected by weather.

5.1.2 Relative humidity

Normal range. 5% to 95%.

Note 1. This range corresponds to products that are installed in buildings and are not affected by weather without temperature and humidity control. Expansion range. 5%~100%.

Note 2. This range corresponds to products installed outside buildings and used in places affected by weather.

5.1.3 Atmospheric pressure and altitude

Atmospheric pressure. 80 kPa~106 kPa; Corresponding altitude. 2 000 m~-500 m.

5.1.4 Power supply

AC type. rated voltage ±20%, 47 Hz~63 Hz; DC type. rated voltage ±10%.

5.2 Outdoor

5.2.1 Temperature range

-40 °C~70 °C.

5.2.2 Relative humidity

5%~100%.

5.2.3 Atmospheric pressure and altitude

Atmospheric pressure. 80 kPa~106 kPa; Corresponding altitude. 2 000 m~-500 m.

5.2.4 Power supply

AC type. rated voltage ±20%, 47 Hz~63 Hz; DC type. rated voltage ±10%.

6.1 General

The configuration of the performance and function of the monitoring device shall meet the requirements of monitoring the working status and operating parameters of the SPD. Table 2 The monitoring devices meet this standard The mandatory requirements and optional requirements that should be provided are specified. The optional requirements depend on the manufacturer's declared SPD performance degradation trend. Potential analysis methods and other optional functions.

6.2 Access security performance requirements

The safety performance requirements of SPD intelligent monitoring devices are as follows.

a) The access of the SPD intelligent monitoring device should not change the connection mode of the monitored SPD, nor affect the sealing performance and insulation of the monitored SPD.

Edge performance, does not affect the safe operation and protection performance of SPD;

b) For monitoring devices that need to obtain signals from the SPD ground wire, the original grounding performance should not be changed, and the ground down conductor should be connected reliably Ground and meet the corresponding flow capacity;

c) The SPD intelligent monitoring device should not affect the protection performance of the monitored SPD during its normal operation and due to its failure.

6.3 Appearance and structure

6.3.1 Appearance

The surface of the device should be clean, free of scratches, cracks and deformation; the color should be uniform and there should be no obvious difference; the marking should be complete, clear, correct and firm.

6.3.2 Structure

The fasteners are not loose, and the buttons are flexible and reliable (if applicable).

6.4 Performance

6.4.1 Peak surge current monitoring

6.4.1.1 Surge current test waveform type

Use the current waveform specified in GB/T 18802.11.

6.4.1.2 Maximum monitoring current (FSI)

According to the inrush current of the monitored SPD, it should meet the requirements of Table 3.

6.4.1.3 Minimum monitoring current

6.4.1.4 Measurement error value

6.4.2 Surge current waveform monitoring

6.4.2.1 Surge current waveform acquisition

Requirements are as follows.

a) Surge current verification waveform type

b) Monitoring error value The error between the front time and the half-peak time. <=±15%.

6.4.2.2 Waveform record time length

The waveform time length is >=2 ms.

6.4.3 Surge current unit energy monitoring

6.4.3.1 Overview

With this performance, it must also meet the requirements of 6.4.2.

6.4.3.2 Surge current unit energy monitoring range

The monitoring device should effectively record the current unit energy within its declared peak surge current monitoring range.

6.4.3.3 Monitoring error value

Unit energy error. <=±20%.

6.4.4 (Monitored) SPD action monitoring

The monitoring device should be able to effectively record the number of SPD actions and their action time within the peak monitoring range.

6.4.5 SPD remote signal status monitoring

The monitoring device should be able to effectively monitor the remote signal status of the SPD and record the time when the remote signal status changes.

6.4.6 Full current monitoring

6.4.6.1 Full current monitoring range

The minimum value (effective value) <=100 µA; the maximum value is declared by the manufacturer.

6.4.6.2 Full current monitoring error

6.4.7 Resistive current monitoring

Measurement error. <=±(standard value×10%+2 µA)

6.4.7.1 Resistive current monitoring range

The minimum value (peak value of the fundamental wave) is <=20 µA; the maximum value is declared by the manufacturer.

6.4.7.2 Resistance current monitoring error

Measurement error. <=±(standard value×10%+2 µA).

6.4.8 Temperature monitoring

Normal range. temperature monitoring range -5 °C~160 °C, temperature monitoring error should be <=±3 °C.

The manufacturer can declare the temperature monitoring range according to actual needs, but it shall not be lower than the provisions of this standard.

6.5 Function

6.5.1 SPD working status monitoring

The monitoring device should have the monitoring function of the working status and parameters of the SPD, including at least. SPD operation times, operation time, surge current Characteristic parameters, remote signaling status, remote signaling status change time and performance degradation trend, etc.

6.5.2 SPD performance degradation trend monitoring

The monitoring device can use one of the following three methods to analyze the SPD performance degradation trend, and the manufacturer should refer to the testing machine before the certification test The organization provides a description of the corresponding deterioration trend monitoring method and its declared alarm value.

a) Analyze according to the characteristic parameters of the surge current flowing through the SPD;

b) Analyze according to the change of SPD's full current or resistive leakage current;

c) Analyze based on the temperature change of SPD or its internal components.

6.5.3 SPD access status monitoring

The monitoring device has the function of monitoring the connection status of the SPD connected to the power supply system it protects.

6.5.4 Instructions

The monitoring device shall have the local indication function declared by the manufacturer.

6.5.5 Storage

The monitoring device should have a local storage function, can store the monitored SPD working state parameters, and have a power-off save function.

6.5.6 Calibration time

The monitoring device can be set locally or through the remote monitoring system to achieve time calibration.

6.5.7 Data Transmission

The monitoring device should have a data transmission interface, and realize data transmission with the remote monitoring system through wired or wireless communication.

The data communication protocol can adopt the MODBUS protocol, or be negotiated by the manufacturer and the user.

The transmitted data includes at least. SPD action times, action time, surge current characteristic parameters, SPD remote signal status, etc.

6.6 Security

6.6.1 Electric strength

Should meet the requirements of Article 5.2 of GB 4943.1-2011.

6.6.2 Insulation resistance

The insulation resistance between the live parts of the SPD main circuit and the live parts of the monitoring device meets the requirements of GB/T 18802.11.

6.6.3 Enclosure protection level (IP code)

Indoor type protection level (IP code) IP 2X; outdoor type protection level (IP code) IP 6X.

6.6.4 Flame retardant

The insulating material of the enclosure should be flame-retardant or self-extinguishing.

6.7 Electromagnetic compatibility

6.7.1 Immunity requirements

The immunity of the monitoring device shall meet the requirements of Table 4.

6.7.2 Criteria for immunity performance

The performance criteria are as follows.

a) During the test, if the function or performance is normal within the technical requirement limit, it can be judged as Class A.

b) During the test, the function or performance is temporarily reduced or lost, but it can recover by itself without affecting the monitoring performance, which can be judged as B level.

6.8 Environmental adaptability

6.8.1 Climate and environment adaptability

6.8.1.1 Low temperature operation

Should meet the requirements of GB/T 2423.1-2008.

a) Normal range Test temperature. -5 °C, duration >=16 h, intermediate testing should be carried out during the test, and the tested device should be able to work normally.

b) Extended range Test temperature. -40 °C, duration >=16 h, intermediate testing should be carried out during the test, and the tested device should be able to work normally.

6.8.1.2 High temperature operation

Should meet the requirements of GB/T 2423.2-2008.

a) Normal range Test temperature. 40 °C, duration >= 16 h, intermediate testing should be carried out during the test, and the tested device should be able to work normally.

b) Extended range Test temperature. 70 °C, duration >=16 h, intermediate testing should be carried out during the test, and the tested device should be able to work normally.

6.8.1.3 Damp heat

Should meet the requirements of GB/T 2423.3-2016.

a) Normal range Test temperature. 40 °C, humidity (93±3)%, duration >=24 h, intermediate detection should be carried out during the test, and the tested device should be able to Work often.

b) Extended range Test temperature. 40 °C, humidity 100%, duration >=24 h, intermediate testing should be carried out during the test, and the tested device should be able to work normally.

6.8.2 Adaptability to mechanical environment

6.8.2.1 Vibration

The requirements of GB/T 2423.10 shall be met, and 6.3 shall be tested after the test.

6.8.2.2 Shock

The requirements of GB/T 2423.5 shall be met, and 6.3 shall be tested after the test.

6.8.2.3 Drop

The requirements of GB/T 2423.8-1995 shall be met, and 6.3, 6.4.1, and 6.4.4 shall be tested after the test.

7.1 Test conditions

The performance test of the monitoring device shall be carried out under the standard atmospheric conditions of the test.

--Temperature. 15 °C~35 °C;

--Relative humidity. 45%~75%;

--Atmospheric pressure. 86 kPa~106 kPa;

--Power supply. AC rated voltage ±10%, 50/60 Hz ±1 Hz; DC rated voltage ±10%.

--The power supply and wiring of the monitoring device in the test shall be connected according to its actual use state.

7.2 Basic requirements for test equipment

7.2.1 Impulse current generator

Meet the requirements of GB/T 16927.4-2014, can output the impulse current waveform required for measurement, and the maximum impulse current value should meet the measurement The maximum value of the required range.

7.2.2 Standard current monitor

The requirements for standard current monitors are as follows.

a) The range meets the requirements of the measurement range;

b) The bandwidth (-3 dB) meets at least 3 Hz~1 MHz;

c) The amplitude error is <=±1%.

7.2.3 Digital Storage Oscilloscope

The requirements of the digital storage oscilloscope are as follows.

a) The bandwidth (-3 dB) at least satisfies DC~20 MHz;

b) With function calculation function (suitable for unit energy test).

7.2.4 Current monitoring device

The requirements of the current monitoring device are as follows.

a) The effective value range of the alternating current meets the requirements of the measurement range;

b) The frequency response shall meet at least. 40 Hz~100 kHz.

7.2.5 Adjustable resistor

Power >=0.25 W.

7.2.6 Frequency conversion power analyzer

The requirements of the frequency conversion power meter are as follows.

a) Bandwidth. >=50 kHz;

b) Sampling frequency. more than 2 times the bandwidth;

c) Voltage and current accuracy level. <= 0.5 level;

d) Power accuracy level. <= 0.5 level;

e) Applicable fundamental frequency range of accuracy level. DC, 0.1 Hz~400 Hz;

f) Accuracy level applicable voltage range. meet the voltage range required for resistive current testing of this standard;

g) Accuracy level applicable current range. meet the resistive current range of this standard;

h) Applicable power factor range of accuracy level. 0.05~1.

7.3 Access security performance

According to the SPD intelligent monitoring device access method provided by the manufacturer, through visual inspection and testing of insulation resistance, verify that the monitoring device is connected Whether it meets the requirements of 6.2.

a) The monitored SPD should be able to work independently; Requirements;

c) The data collection end of the monitoring device should use an isolated circuit or a non-connected sensor to collect the working status and operating parameters of the monitored SPD. number.

7.4 Appearance and structure

Check the requirements of 6.3 item by item by visual method and feel method.

7.5 Performance

7.5.1 Peak surge current monitoring

The surge current peak monitoring is carried out according to the following requirements.

a) The test shall be carried out in accordance with GB/T 16927.4-2014, refer to Figure 1 to connect the equipment and the device under test;

7.5.2 Surge current waveform monitoring

7.5.2.1 Surge current waveform acquisition

Surge current waveform acquisition is performed according to the following requirements.

a) The test should be carried out in accordance with the standard of GB/T 16927.4-2014, and the equipment and the tested device should be connected according to Figure 1;

b) The power supply and wiring of the monitoring device in the test shall be connected according to its actual use state;

c) The test waveform is set to 8/20 µs and 10/350 µs respectively;

d) 8/20 µs impulse current is set to the minimum value and maximum value of the peak measurement range of the device under test;

e) The 10/350 µs peak value of impulse current is set to the minimum value of the peak measurement range of the device under test, and the device under test claimed by the user can withstand The maximum value of the received peak value;

f) Test the positive and negative polarity of each test point once;

g) The waveform displayed by the device under test is consistent with the waveform displayed by the digital storage oscilloscope;

h) At each test point, read the wavefront and half-peak time corresponding to the impulse current waveform from the digital storage oscilloscope and the device under test. between.

i) Calculate the wavefront time error according to formula (2).

7.5.2.2 Waveform record time length

During the 7.5.2.1 test, read the recorded waveform through the remote monitoring system, and the waveform record length should meet the requirements of 6.4.2.2.

7.5.3 Surge current unit energy monitoring

Simultaneously with the test of 7.5.2.

7.5.4 SPD action monitoring

During the 7.5.1 peak surge current monitoring test, after each impact, query the number of SPD actions recorded by the device under test, SPD The number of actions should correspond to the number of impacts and increase gradually. There should be a corresponding time record for each record of the number of SPD actions.

7.5.5 SPD remote signal status monitoring

By splitting and combining the SPD remote signal status monitoring interface of the tested device, repeat the action 5 times in total to observe the tested sample or remote monitoring system.

Display warning information accurately. The alarm information should be recorded with corresponding time.

7.5.6 Full current monitoring

7.6 Function

7.6.1 SPD working status monitoring

During the 7.5 performance test, the monitoring device or remote monitoring system can be used to monitor the working status of the SPD.

7.6.2 SPD performance degradation trend monitoring