Description
Intelligent universal circuit breaker (hereinafter referred to as circuit breaker) is suitable for AC 50Hz, rated voltage 400V, 690V, rated current 630 ~ 6300Alt is mainly used in the distribution network to distribute electric energy and protect circuits and power equipment from overload, undervoltage, short circuit , Single-phase ground fault. The circuit breaker has a variety of intelligent protection functions, which can realize selective protection and precise action. Its technology has reached the advanced level of similar products in the world, and it is equipped with a communication interface, which can carry out “four remotes” and meet the requirements of the control center and automation system. Avoid unnecessary power outages and improve power supply reliability. This series of products complies with lEC60947-2 and GB/T14048.2 standards.
Normal Working Condition
1. The ambient air temperature is -5℃~+40℃, and the average temperature of 24 hours does not exceed +35℃.
2. The altitude of the installation site does not exceed 2000m
3. When the maximum temperature of the installation site is +40℃, the relative humidity of the air shall not exceed 50%, and higher relative humidity can be allowed under lower temperature; the average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of the month is +25℃, taking into account the condensation on the product surface due to temperature change
4. The pollution degree is level 3
5. The installation category of the main circuit of the circuit breaker, the under-voltage controller coil and the primary coil of the power transformer is IV, and the installation category of the other auxiliary circuits and control circuits is III
6. The vertical inclination of the circuit breaker installation does not exceed 5
7. The circuit breaker is installed in the cabinet, protection level is IP40; if add door frame,the protection level can reach IP54
Classification
1. The circuit breaker is divided into three poles and four poles according to the number of poles.
2. The rated current of the circuit breaker is divided into 1600A, 2000A, 3200A, 4000A, 5000A(capacity increased to 6300A).
3. Circuit breakers are divided according to purposes: power distribution, motor protection, generator protection.
4. According to operation mode:
Motor operation;
Manual operation (for overhaul and maintenance).
5. According to installation mode:
Fix type: horizontal connection, if add vertical bus, the cost of vertical bus will be
calculated separately;
draw-out type: horizontal connection, if add vertical bus, the cost of vertical bus will be calculated separately.
6. According to the type of tripping release:
Intelligent over current tripping release, Under-voltage instantaneous (or delay) release
and Shunt release
7. According to the type of intelligent controller:
M type (general intelligent type);
H type (communication intelligent type).
Functional Characteristics Of Different Types Of Intelligent Controllers
M type: In addition to the four section protection features of overload long time delay, short circuit short time delay, instantaneous and earth leakage, it also has fault status indication, fault record, test function, ammeter display, voltmeter display, various alarm signal output, etc It has a wide range of protection characteristic area values and complete auxiliary functions. It is a multi-functional type and can be applied to most industrial applications with high requirements.
H type: It can have all the functions of M type. At the same time, this kind of controller can realize the“ four remote” functions of telemetry, remote adjustment, remote control and remote signaling through the network card or interface converter. It is suitable for the network system and can be centrally monitored and controlled by the upper computer.
1. Ammeter function
The current of the main circuit can be displayed on the display screen. When the selection key is pressed, the current of the phase in which the indicator lamp is located or the maximum phase current will be displayed. If the selection key is pressed again, the current of the other phase will be displayed.
2. Self-diagnosis function
The trip unit has the function of local fault diagnosis. When the computer breaks down, it can send out an error“ E” display or alarm, and restart the computer at the same time,the user also can disconnect the circuit breaker when needed
When the local ambient temperature reaches to 80℃ or the temperature in the cabinet exceeds 80℃ due to the heat of the contact, an alarm can be issued and the circuit breaker can be opened at a small current (when required by the user)
3. Setting function
Press the long delay, short delay, instantaneous, grounding setting function keys and +, – key to set the required current and delay time arbitrarily according to user requirements,and press the storage key after the required current or delay time is reached. For details,see the chapter on installation, use and maintenance. The setting of the trip unit can immediately stop executing this function when an overcurrent fault occurs.
4. Testing function
Press the setting key to make the set value current to long delay, short delay,instantaneous state, indicator shell and +、- key, select the required current value, and then press the testing key to carry out the test of release. There are two types of testing keys;one is non-tripping testing key, and the other one is tripping testing key. For details, see the tripping device test in the chapter of Installation, Use and Maintenance. The former testing function can be performed when the circuit breaker is connected to the power grid.
When an overcurrent occurs in the network, the testing function can be interrupted and the overcurrent protection can be performed.
5. Load monitoring function
Set two setting values, Ic1 setting range (0.2~1) In, Ic2 setting range (0.2~1) In, Ic1 delay characteristic is inverse time limit characteristic, its delay setting value is 1/2 of long delay setting value. There are two kinds of delay characteristics of Ic2: the first kind is the inverse time limit characteristic, the time setting value is 1/4 of the long delay setting value; the second kind is the time limit characteristic, the delay time is 60s. The former is used to cut off the least important load of the lower stage when the current is close to the overload setting value, the latter is used to cut off the unimportant load of the lower stage when the current exceeds the value of Ic1, then current drops to make the main circuits and important load circuits remain powered. When the current drops to Ic2, a command is issued after a delay, and the circuit that has been cut off by the lower stage is turned on again to restore the power supply of the entire system, and the load monitoring feature.
6. Display function of the tripping unit
The tripping unit can display its operating current (ie ammeter function) during operation,display the section specified by its protection characteristics when a fault occurs, and lock the fault display and fault current after breaking the circuit, and display the current, time and section category of the setting section at the setting time. If it is a delayed action, the indicator light flashes during the action, and the indicator light changes from flashing to constant light after the circuit breaker is disconnected.
7.MCR on-off and analog tripping protection
The controller can be equipped with MCR on-off and analog tripping protection according to the user’s needs. The two modes both are instantaneous actions. The fault current signal sends action instructions directly through the hardware comparison circuit. The setting current values of the two actions are different. The setting value of the analog tripping is high, which is generally the maximum value of the instantaneous protection domain value of the controller (50ka75ka/100kA), The controller works all the time and is generally used as a backup. However, the setting value of MCR is low, generally 10kA. This function only works when the controller power on, it does not work during normal closed operation. The user can require special setting value with accuracy of ±20%.
