NB/T 10331-2019Multi-function commutation switch (English PDF)

3.1 Three-phase load unbalance automatic regulating equipment

Installed in the distribution station area, it can automatically adjust the load phase or automatically compensate the load current to realize the distribution transformer in the distribution station area A device system with the maximum balance of three-phase current (power) at the outlet of each low-voltage circuit on the low-voltage side.

3.2 Commutation-switch type three-phase load unbalance automatic regulating equipment

Commutation switch type three-phase load automatic adjustment device unbalance automatic regulating equipment It consists of a device main unit (control management unit) and several sub-units (multi-function commutation switch), which are controlled by the main unit The system sub-unit performs phase commutation and automatically adjusts the power load phase. The power load of the low-voltage circuit is balancedly distributed on the three phases of A, B, and C.

At present, the three-phase current (power) of each low-voltage circuit outlet on the low-voltage side of the distribution transformer in the distribution station area is balanced to the maximum extent.

3.3 Control and management unit

The main unit of the commutation switch type three-phase load imbalance automatic adjustment device is used to monitor the power supply status of the three-phase line and control one or more The load of the sub-unit is switched between different phases, which integrates functions such as electricity consumption information collection, equipment operation status monitoring, intelligent control and communication. The secondary equipment.

3.4 Multi-function commutation switch

The sub-unit of the commutation switch type three-phase load imbalance automatic adjustment device is used to connect the single-phase electric load to the three-phase power supply (low-voltage circuit)

It is an intelligent device that integrates information collection, data communication, phase switching and other functions to realize three-phase load imbalance management. Prepared.

3.5 Working phase

The phase of the multi-function commutation switch that is currently connected and carrying load current.

3.6 Free phase

The phase with no load current in the multi-function commutation switch.

3.7 Commutation response time

Measure the time from the commutation command issued by the main unit to the closing of the main contact of any idle phase of the subunit.

3.8 Commutation switching time

Measure the time from the opening of the main contact of the working phase to the closing of the main contact of any idle phase.

3.9 Commutation power-off time

Under the condition of the longest arcing time, the measurement from the moment when the arc of the working phase is finally extinguished during the commutation switching process to the idle phase The time until the main contact is closed.

4.3.2.1 in GB/T 14048.1-2012 applies

4.3.2.2 in GB/T 14048.1-2012 applies

4.5 in GB/T 14048.1-2012 applies

5.1 Summary of Features

The characteristics of the multi-function commutation switch should specify the following items (if applicable).

-The rated value and limit value of the main circuit (5.2);

--Characteristics related to residual current function (5.3)

--Control circuit (5.4); -Auxiliary circuit (5.5);

- Communication (5.6).

of GB/T 14048.1-2012 applies.

5.2 Ratings and limits of the main circuit

5.2.1 Rated voltage

5.2.1.1 Rated working voltage (Ue)

The rated working voltage of the multi-function commutation switch is a voltage value that is combined with the rated working current to determine the use of electrical appliances. The corresponding test is relevant.

5.2.1.2 Rated insulation voltage (Ui)

The rated insulation voltage is the voltage value specified by the manufacturer, which is related to the dielectric test voltage and creepage distance.

Under no circumstances should the maximum rated working voltage exceed the rated insulation voltage.

5.2.1.3 Rated impulse withstand voltage (Uimp)

Under specified conditions, electrical appliances can withstand impulse voltage peaks of specified shape and polarity without breakdown. This value and electrical clearance related.

5.2.2 Current

5.2.2.1 Conventional free air heating current (Ith)

5.2.2.2 Conventional enclosed thermal current (Ithe)

5.2.2.3 Rated working current (Ie)

The rated working current of the multi-function commutation switch is the rated uninterrupted current, and 4.3.2.4 of GB/T 14048.1-2012 applies.

5.2.3 Rated frequency

The power frequency used in the design of electrical appliances and related to other characteristic values.

5.2.4 Rated making capacity and breaking capacity

The rated making capacity and breaking capacity are specified by the manufacturer, that is, under the specified conditions, the multi-function commutation switch can be connected well The current value of on and off. Unless otherwise specified, the rated making capacity and breaking capacity are expressed by steady-state current values. During the switch-on operation, touch The peak current when the head is closed may be higher than the steady-state current amplitude, which depends on the characteristics of the test circuit (load) and the voltage phase at the moment of closing. Bit angle.

5.2.5 Short circuit characteristics

5.2.5.1 Rated short-circuit making capacity

The rated short-circuit making capacity is specified by the manufacturer. Under the rated working voltage, rated frequency and specified power factor, multi-function commutation Change the short-circuit making capacity value of the switch. The rated short-circuit making capacity is expressed by the maximum expected peak current.

The rated short-circuit making capacity of the multi-function commutation switch should not be less than its rated limit short-circuit breaking capacity multiplied by GB/T The value after the coefficient n in Table 16 in 14048.1-2012.The manufacturer can specify a larger short-circuit making capacity value.

The rated short-circuit making capacity means that the multi-function commutation switch can be switched on under an appropriate applied voltage corresponding to the rated operating voltage. The rated capacity of the stream.

5.2.5.2 Rated short-circuit breaking capacity

The rated short-circuit breaking capacity is specified by the manufacturer. Under the rated working voltage, rated frequency and specified power factor, the multi-function commutation Change the short-circuit breaking capacity value of the switch.

The rated short-circuit breaking capacity requires that the multi-function commutation switch should be able to break under the power frequency recovery voltage corresponding to the specified test voltage Less than or equal to any current value equivalent to the rated capacity, and the power factor is not less than the provisions of Table 16 in GB/T 14048.1-2012. The rated short-circuit breaking capacity is specified as.

--- rated ultimate short-circuit breaking capacity, see 4.3.5.2.1 in GB/T 14048.2-2008;

--For rated operating short-circuit breaking capacity, see 4.3.5.2.2 in GB/T 14048.2-2008.

5.2.5.3 Rated short-time withstand current

The rated short-time withstand current is specified by the manufacturer. Under the test conditions specified in 9.3.9.3, the multi-function commutation switch can carry Short-time withstand current value.

The rated short-time withstand current value is expressed by the effective value of the AC component of the current, and the maximum peak current of any phase should not be less than the effective value N times the value, the coefficient n is given in Table 16 of GB/T 14048.1-2012.

The minimum short-time withstand current should not be less than 12Ie, unless otherwise specified by the manufacturer, the power-on duration should be 1 s.

5.2.5.4 Rated limit short-circuit current

The rated limit short-circuit current is specified by the manufacturer. Under the test conditions specified in 9.3.9.4, it is protected by the designated short-circuit protection device (SCPD).

The expected short-circuit current value that the protected multi-function commutation switch can withstand during the action time of the short-circuit protection appliance.

The manufacturer shall explain the details of the specified short-circuit protection electrical appliances, including its model, rating, and characteristics. For current-limiting electrical appliances, also Should include the maximum peak current and I2t corresponding to the expected current value.

For AC, the rated limited short-circuit current is expressed by the effective value of the AC component of the current.

The short-circuit protection electrical appliance can be used as a component of the multi-function commutation switch or a separate electrical appliance.

5.3 Characteristics of multi-function commutation switch related to residual current function

5.3.3 Rated residual short-circuit making and breaking capacity value (I*m)

The manufacturer can test the larger value and publish the value.

5.3.4 Action characteristics in the case of ground fault current with or without DC component

5.3.1 Ratings

5.3.1.1 Rated residual operating current (I*n)

The manufacturer specifies the multi-function commutation switch with residual current function. The multi-function commutation switch is regulated under this current.

The effective value of sinusoidal residual operating current that must be operated under certain conditions.

Note: For those with multiple residual operating current setting values, the maximum setting value is usually used to indicate its rated value.

5.3.1.2 Rated residual non-operation current (I*no)

According to the manufacturer's requirements for the multi-function commutation switch with residual current function, the multi-function commutation switch is under the specified conditions The effective value of the residual non-operation current of the sine that should not be operated.

5.3.1.3 Rated residual short-circuit making and breaking capacity (I*m)

The manufacturer's requirements for the multi-function commutation switch with residual current function, under this value, the multi-function commutation switch is specified The effective value of the AC component of the expected residual short-circuit current that can be connected, carried and broken under the conditions of […]

5.3.2 Preferred value and limit value

5.3.2.1 Preferred value of rated residual operating current (I*n)

The preferred value of the rated residual operating current is.

0.006 A, 0.01 A, 0.03 A, 0.1 A, 0.3 A, 0.5 A, 1 A, 3 A, 10 A, 30 A. Higher values can be requested.

I*n can be expressed as a percentage of the rated current.

5.3.2.2 The minimum value of the rated residual non-operation current (I*no)

The minimum value of the rated residual non-operation current is 0.5I*n.

5.3.2.3 Action characteristics

5.3.2.3.1 Non-delay type

5.3.2.3.2 Delay type

5.3.2.3.2.1 Limit non-driving time

For the delay type, the limit non-driving time is specified by 2I*n and should be announced by the manufacturer.

5.3.2.3.2.2 Action characteristics

For the multi-function commutation switch with residual current function whose limit non-driving time is greater than 0.06 s, the manufacturer shall publish in I*n, Maximum off time of 2I*n, 5I*n and 10I*n.

For the multi-function commutation switch with residual current function whose limit non-driving time is 0.06 s, the operating characteristics are given in Table 2.

5.3.4.1 AC type

For the residual sinusoidal AC current without DC component that is suddenly applied or slowly rising, the residual current function with residual current function is guaranteed to be tripped. Multi-function commutation switch.

5.4 Control circuit

5.5 Auxiliary circuit

The characteristics of auxiliary circuits are the number and type of contacts (a contact, b contact, etc.) in each circuit and their rated values. For rated values, see GB/T 14048.5-2017.

The characteristics of the auxiliary contact should meet the requirements of GB/T 14048.5-2017.

5.6 Communication

The communication mode between the multi-function commutation switch and the main unit can be.

--wireless;

--Wired (such as power carrier, RS485, etc.).

6.1 Types of data

6.2 Logo

Each multi-function commutation switch shall be marked with the following contents in an easily recognizable and durable way.

a) The name or trademark of the manufacturer;

b) Model or serial number;

c) Rated working voltage;

d) Rated working current;

e) Whether it is suitable for isolation, and if applicable, mark it with a symbol;

f) Rated frequency value;

g) Rated impulse withstand voltage;

h) The rated operating short-circuit breaking capacity corresponding to the rated operating voltage;

i) The rated ultimate short-circuit breaking capacity corresponding to the rated working voltage;

j) Rated short-time withstand current and duration (when applicable);

k) Rated limited short-circuit current (when applicable);

l) Power connection terminals and load connection terminals, unless it does not matter which terminal is connected to the power supply;

m) Neutral pole wiring terminal, if applicable, indicated by the letter "N";

n) The enclosure protection class of the electrical appliance;

o) Rated insulation voltage;

p) Production date or serial number.

The above a), b), c), d), l), m) marks should be marked on the appliance body, or on one or several nameplates attached to the appliance.

The logo should be installed in a place where the appliance is clearly visible from the front after it is installed according to the manufacturer's instructions.

6.3 Instructions for installation, use and maintenance

7.1 Normal use conditions

7.1.1 Temperature and humidity conditions

The ambient air temperature and relative humidity of the air should meet the requirements of Table 3. More severe conditions can be negotiated between the user and the manufacturer.

7.1.2 Altitude

The altitude of the installation site generally does not exceed 2 000 m.

Note: For electrical appliances used at altitudes higher than 2 000 m, the cooling effect of air and the decrease in dielectric strength need to be considered. For electrical equipment used for operation under the above conditions The equipment should be designed or used according to the agreement between the manufacturer and the user.

7.1.3 Pollution degree

The pollution level is related to the environmental conditions in which the electrical appliance is used.

For electrical appliances used in enclosures or electrical appliances with enclosures, the pollution level can be the environmental pollution level in the enclosure.

In order to facilitate the determination of electrical clearance and creepage distance, the microenvironment can be divided into four pollution levels. Pollution degree 1. No pollution or only dry non-conductive pollution. Pollution degree 2.

Generally speaking, only non-conductive pollution occurs, but it must be considered that temporary conductivity caused by condensation occasionally. Pollution degree 3.

There is conductive pollution, or dry non-conductive pollution becomes conductive due to condensation. Pollution degree 4.

Cause persistent conductive pollution, such as pollution caused by conductive dust or rain and snow.

The pollution degree of the multi-function commutation switch should not be lower than pollution degree 3.

7.2 Transport and storage conditions

If the transportation and storage conditions of the multi-function commutation switch, such as temperature and humidity, are different from the conditions specified in 7.1, the manufacturer A special agreement should be reached with the user. Unless otherwise specified, the following temperature ranges are suitable for transportation and storage. between -40°C and 70°C, short It can reach 80°C within 24 hours.

The multi-function commutation switch that does not operate at extreme temperatures should not withstand irreversible damage. It is multi-function under normal conditions The commutation switch should be able to operate normally according to regulations.

More severe transportation and storage conditions are negotiated between the manufacturer and the user.

7.3 Installation

It should be installed according to the manufacturer's instructions.

8.1 Structural requirements

8.1.1 Materials

Insulating materials that may be affected by thermal stress under the action of electricity and their deterioration may reduce the safety of electrical appliances.

The fire should not produce adverse effects. The insulating material part of the multi-function commutation switch should have corresponding resistance to abnormal heat and fire ability.

When testing on electrical appliances or components, the insulating material used to fix the current-carrying parts shall comply with 8.2.1.1.1 of GB/T 14048.1-2012 The glow wire test requires that the test temperature is 960°C.

Other insulating materials shall meet the glow wire test requirements in 8.2.1.1.1 of GB/T 14048.1-2012, and the test temperature shall be 650°C.

8.1.2 Mechanical strength of enclosure

8.1.2.1 Shock

The multi-function commutation switch should be able to withstand the impact durability and peak acceleration with a peak acceleration of 147 m/s² and a pulse period of 11ms The shock response capability is 49 m/s² and the pulse period is 11 ms.

8.1.2.2 Vibration

The multi-function commutation switch should be able to withstand vibration with a frequency of 10 Hz~150 Hz and an acceleration of 10 m/s², and a frequency of 10 Hz~150 Hz (crossover frequency 58 Hz~60 Hz), displacement amplitude 0.035 mm, peak acceleration 5 m/s² vibration response capability.

8.1.3 Enclosure protection class