YCW1i Air Circuit Breaker

Type designation

Operating conditions

a.Environmental temperature

The ambient air temperature is -5℃~+40℃,and its average temperature value within 24 hours does not exceed+35℃.When the ambient temperature exceeds +40℃,it must be reduced according to Table 1-1 of P8,and the maximum allowable temperature is +65℃.Low temperature environments should be declared for customization at the time of ordering.

b.Altitude

The altitude of the installation site shall not exceed 2000m(If it exceeds 2000 meters,it is necessary to reduce the capacity for use,and the derating requirements refer to Table 1-2 of P8).

c.Humidity

Relative humidity of air:When the maximum temperature is 40℃,the relative humidity of the air does not exceed 50%.Higher relative humidity can be allowed at lower temperatures,such as 90% at 20℃.Special measures should be taken for condensation caused by temperature changes.

d.Pollution level:3.

e.Selective category:B

f.Installation Category

The installation category of the circuit breaker is IV,when the rated operating voltage of the main circuit is ≤AC400V,for the installation category of the auxiliary circuit,besides that the coilof the undervoltage release and the transformer for the intelligent controller or the coil at the primary side of the power module are the same with that of the circuit breaker,when the rated operating voltage of the main circuit is >AC400V and ≤AC690V,the auxiliary circuit needs to be isolated from the main circuit by a transformer,with capacity of 22KVA and the maximum operating voltage of the control circuit is AC400V,and the installation category of auxiliary circuits is III.

g.Installation conditions:The circuit breaker should be installed according to the requirements of this manual,and its vertical inclination should not exceed 5°.

h.Transportation and storage conditions:between -25℃ and +55℃,up to +70℃ in a short period of time(24 hours)

Technical data

Rated frame current		1600
Rated operating current In(A)		200/315/400/500/630/800/1000/1250/1600
Number of poles		3P/4P
Frequency(Hz)		50
Rated operating voltage Ue(V)		400/690
Rated insulation voltage Ui(V)		1000
Rated impulse withstand voltage Uimp(KV)		12
Breaking capacity level		Empty(conventional)
Rated ultimate breaking capacity Icu	AC400V	55
	AC690V	25
Rated service breaking capacity IcS(kA)	AC400V	42
	AC690V	20
Rated short time withstand current Icw/ls(kA)	AC400V	42
	AC690V	20
Service life	Mechanical	Maintenance-free 3000,with maintenance10000
	Electrical	Maintenance-free 1000
Arc distance (mm)		0
Installation mode		Fixed/draw-out type
Connection mode		HorizontalNertical
Controller type		M,H,2H,3M,3H

Overall and mounting dimensions(mm)

 

YCW1i 2000~6300 Series Air Circuit Breaker

General

YCW1i-2000~6300 series intelligent universal circuit breakers(hereinafter referred to as circuit breakers)are suitable for AC 50Hz distribution networks with rated voltage of AC400V/690V and below,and rated current ranging from 200A to 1600A.They are manly used to distribute electrical energy,and protect circuits and power equipment from overload,under voltage,short circuit,single -phase grounding and other faults.Under normal conditions,it can also be used for infrequent switching of lines.The circuit breaker has intelligent protection function,precise selective protection,can improve power supply reliability and avoid unnecessary power outages.At the same time,it has an open communication inter-face and can be used for “four remotes”to meet the requirements of the control center and automation system.

Standards:IEC60947-2.

Type designation

·Classification:

Classified by installation mode

a.Fixed type

b.Draw-out type

Classified by number of poles:three poles,four poles

Classified by operation mode

a.Electrical operation

b.Manual operation (for maintenance and repair)

·Release type:

Intelligent controller,undervoltage instantaneous (or delay)release,shunt release.

·Intelligent controller performance:

a.Intelligent controllers are classified into:M-type,3M type,H-type,2H type and 3H type;

b.It is equipped with overload long delay inverse time limit,short delay inverse time lim-

it,definite time limit,instantaneous function,which can be set by the user to form the required protection characteristics;

c.Single phase grounding protection function;

d.Display function:setting current display,action current display,and voltage display of

each phase (voltage display shoud be proposed when ordering);

e.Alarm function:overload alarm;

f.Self-inspection function:overheating self-inspection,microcomputer self diagnosis;

g.Test function:it tests the action characteristics of the intelligent controller.

Normal service and installation conditions

·Environmental temperature

The ambient air temperature is -5°℃~+40℃,and its average temperature value within 24 hours does not exceed+35°℃.When the ambient temperature exceeds+40℃,it must be reduced according to Table 1-1,and the maximum allowable temperature is +65℃.Low temperature environments should be declared for customization at the time of ordering.

·Altitude

The altitude of the installaion site shall not exceed 2000m (If i exceeds 2000 meters,it is necessary to reduce the capacity for use,and the derating requirements refer to Table 1-2).

·Humidity

Relative humidity of air:When the maximum temperature is 40°℃,the relative humidity of the air does not exceed 50%.Higher relative humidity can be allowed at lower temperatures,such as 90%at 20℃.Special measures should be taken for condensation caused by temperature changes.

·Pollution level:3.

·Selective category:B

·Installation Category

The installation category of the circuit breaker is IV,when the rated operating voltage of the main circui is ≤AC400V,for the installation category of the auxiliary circuit,besides that the coil of the undervoltage release and the transformer for the intelligent controller or the coil at the primary side of the power module are the same with that of the circuit breaker,when the rated operating voltage of the main circuit is>AC400V and ≤AC690V,the auxiliary circuit needs to be isolated from the main circuit by a transformer,with capacity of 22KVA and the maxi-mum operating voltage of the control circuit is AC400V,and the installation category of auxiliary circuits is III.

·Installation conditions:The circuit breaker should be installed according to the requirements of this manual,and ts vertical inclination should

not exceed 5°.

·Transportation and storage conditions:between -25℃ and+55℃,up to+70°℃ in a short period of time(24 hours).

Table 1-1 Derating at different temperatures
Ambient temperature			Permissible continuous operating current
+40℃			1In
+45℃			0.95In
+50℃			0.9In
+55℃			0.85In
+60℃			0.8In
+65℃			0.78ln

 

Table 1-2.Derating at different altitudes
Altitude(m)	Rated operating current (A)	Power frequency withstand voltage(V)	Insulation voltage (V)	Rated operating voltage (V)
2000	1le	2200	1000	690
2500	0.93 le	2070	900	635
3000	0.88 le	1950	800	580
3500	0.83 le	1850	750	540
4000	0.78 le	1760	700	500
4500	0.73 le	1680	650	450
5000	Please contact us	1600	600	400

Brief introduction of structure

Circuit breaker front indication

Technical data and performance

The rated current of the circuit breaker is shown in the table below

Table 1
Rated frame current Inm(A)		Rated current In(A)
2000		400,500,630,800,1000,1250,1600,2000
3200		2000,2500,2900,3200
4000		3200,3600,4000
6300		4000,5000,6300
The  arc  distance  of the  circuit  breaker  is  “zero”(i.e.there  is  no flashover outside the  circuit  breaker)
The rated short-circuit breaking capacity and short-term withstand current of the circuit breaker are shown in the table below								Table 2
Rated frame current Inm(A)				2000	3200	4000	6300
Rated ultimate short circuit breaking capacity Icu(kA)O-CO	400V			80	100	100	120
	690V			50	80	80	80
Rated service short circuit breaking capacity Ics(kA)O-CO-CO	400V			65	80	80	100
	690V			40	65	65	70
Rated short time withstand current Icw(kA)/1s O-CO	400V			65	80	80	100
	690V			40	65	65	70
Note:The breaking capacity in the table is the same for the upper and lower incoming lines

Intelligent Overcurrent Controller Protection Characteristics and Functions

Overcurrent Protection Characteristics of the Controller

a. The setting value H(/1) and error of the controller are shown in the following table.

Table 3
Long-time Delay	Short-time Delay		Instantaneous		Ground Fault
I.1	12	Error	I,3	Error	14	Error
(0.4-1)I₁	(1.5-15)l₁	±10%	In~50kA(Inm=2000A); In～75kA(Inm=3200A～4000A); I,～100kA(lnm=6300A)	±15%	0.2-1.0ln	±10%
Note:When three-stage protection is required at the same time,the setting values must not overlap.

b. The inverse - time action characteristic of long - time delay overcurrent protection is TL=(1.5Ir)2t1, and the action time at (1.05~2.0)Ir is shown in Table 4. Its time error is ±15%.

Table 4
1.05Ir	1.30lr	1.5Ir setting time t1(s)	15	30	60	120	240	480
>2h no action	<1h action	2.0Ir setting time (s)	8.4	16.9	33.7	67.5	135	270
Note:t1:Setting time for long-time delay at 1.5Ir;TL:Action time for long-time delay.

c. The protection characteristics of short - time delayed overcurrent are shown in the following table 5.

The short - time delayed overcurrent protection is of definite time limit. If a low multiple is required to be of inverse time limit, its characteristic shall follow Ti=(8lnI)2t0, where t0 is the design time for general delay. When the overload current >8In, it automatically switches to the definite time limit characteristic, and its 

Table 5
Delay time(s)				Reset time (s)
0.1	0.2	0.3	0.4	0.06	0.14	0.23	0.35
d.The overcurrent release protection characteristic is shown in Figure 1,and the earth faultprotection characteristic is shown in Figure 2.

·Load Monitoring Function

Two setting values are set.The setting range of In is(0.2-1)In the setting range of la is (0.2-1).The time characteristic of l is an in-verse-time characteristic,and its time setting value is 1/2 of the long-time delay setting value.There are two types In delay characteristics:the first is the inverse-time function,whose time setting value is 14 of the long-time delay setting value;the second is the definite time limit,whose delay time is 60s. For these two delay functions,the former is used to disconnect the unimportant loads at the lower level when the current is close to the overload setting value;the latter is used to disconnect the unimportant loads at the lower level with a delay when the current exceeds the In setting value,so that the current decreases and the main circuit and important load circuits are protected for power supply.When the current decreases to Ik,after a certain time delay,a command is sent to connect the circuits at the lower level that have been disconnected again,so as to restore the power supply of the entire system.Users can choose either of the two monitoring protections.The monitoring characteristics are shown in Figure 3 and Figure 4.

·MCR(Making and Breaking Capacity)Tripping and Simulated Tripping Protection can be enabled or disabled according to user requirements,and it is generally necessary to disable them during short-time breaking tests.

1.1.MCR making and breaking protection is mainly used when the circuit is closed in the line fault state (instant when the control circuit is powered on).The controller has the function of breaking the circuit breaker at low short-circuit current.The factory setting is 10kA with an error of±20%,and the set current can be determined according to user requirements.

2.The controller is equipped with a function that when an extremely large short-circuit current occurs,the signal is directly sent to the trip-ping signal without being processed by the main chip.

·Thermal Memory Function

After the controller experiences overload or short circuit,before the controller is powered off,it has a memory function simulating the characteristics of the bimetallic strip.The overload energy is released after 30 minutes,and the delay energy is released after 15 minutes.If an overload or short-time delay fault occurs during this period,the tripping time will be shortened.When the controller is powered off,the energy is automatically cleared.

 

Operation, Use and Functions of Type H Intelligent Controller

In addition to all the functions of Type M, it is also equipped with a serial communication interface. Through the communication interface, a master-slave structured network system (hereinafter referred to as the system) can be formed. The system consists of 12 computers as the master station, and intelligent circuit breakers or other communicable components as the slave stations. The system network structure is as fllows:for the circuit breaker unit,the system can realize the remote “our-remote"functions: monitoring of various power grid parameters and operation parameters, display of the current operation state of the intelligent circuit breaker, adjustment and download of various protection setting parameters, and opening/closing operation control of the intelligent circuit breaker. The system is suitable for the construction and transformation of power distribution monitoring systems in various power stations,power plant power consumption, medium and small substations, industrial and mining enterprises, buildings, etc.

The connection diagram of the dedicated communication protocol interface is as follows:

 

Operation Performance of the Circuit Breaker

The operation performance of the circuit breaker is represented by the number of operation cycles.

Table7
Frame Rating Current Inm(A)	Total Number of Operation Cycles
2000	500 times with electricity+2500 times without electricity
32,004,000	500 times with electricity+2000 times without electricity
6300	500 times with electricity+500 times without electricity

Release, Undervoltage Release, Electric Operating Mechanism,Release(Closing) Electromagnet of the Circuit Breaker

Working Voltage and Required Power of the Short-Circuit Controller

Table8
Item    Required fucntion		Rated Working Voltage	AC 50Hz                                DC
			220V	380V	110V	220V
Shunt Release			24VA	36VA	24VA	24VA
Undervoltage Release			24VA	36VA
Closing Electromagnet			24VA	36VA	24VA	24VA
Electric Operating Mechanism	Frame Rating   Current	2000A	85VA	85VA	85VA	85VA
		3200A,4000A	110VA	110VA	110VA	110VA
		6300A	150VA	150VA	150VA	150VA
Power Supply Voltage of the Intelligent Controller			AC220V,AC380V,DC220V,DC110V
Note:The reliable action voltage of the shunt release and of the closing electromagnet an			undervoltage release is 70%-110%of the rated voltage.The reliable action voltage d operating mechanism is 85%-110%of the rated voltage.

Performance of the Undervoltage Release of the Circuit Breaker

Table9
Category		Under-Voltage Delay Release	Under-Voltage Instantaneous Release
Release Action Time		Delay 1,3,5s	Instantaneous
Release Action Voltage Value	35%-70%Ue	Circuit breaker can be reliably opened
	≤35%Ue	Circuit breaker cannot be closed
	(85-110%)Ue	Circuit breaker can be reliably closed
If the power supply voltage returns to 85%Ue within 1/2 of the delay time		Circuit breaker does not open
		Note:The delay time accuracy is±10%

Performance of Auxiliary Contacts

The rated heating current of the auxiliary contact is 6A.

Form of auxiliary contact: Four normally open and four normally closed (transfer contact form).

Abnormal Making and Breaking Capacity of the Auxiliary Contact

Abnormal Making and Breaking Capacity of Auxiliary Contacts Under Abnormal Service Conditions

Table10
Service Category	Making			Breaking			Making and Breaking Operation Cycle Times and Operating Frequency
	U/Ue	I/le	Cosφ or T0.95	Ile	U/Ue	Cosφ or T0.95	Operation Cycle Times	Number of Operation Cycles per Min-ute	Power-On Time(s)
AC-15	1.1	10	0.3	10	1.1	0.3	10	6(or consistent with the main contact operation)	0.05
DC-13	1.1	1.1	6Pe	1.1	1.1	6Pe
Note:When Pe≤50W,the upper limit of t₀=6ms;when Pe>50W,the upper limit of to=300ms

Making and Breaking Capacity of the Auxiliary Contact Under Normal Service Conditions

Table11
Service Category	Making			Breaking
	I/le	U/Ue	Cosφ or T0.95	I/le	U/Ue	Cosφ or T0.95
AC-15	10	1	0.3	1	1	0.3
DC-13	1	1	6Pe	1	1	6Pe

Open Position Key Lock

The circuit breaker is equipped with an“open position key lock”accessory (provided according to order requirements),which can lock the circuit breaker in the open position.At this time,the circuit breaker cannot be closed by either the closing button or the energy-releasing (closing) electromagnet

Structural Overview

1.The fixed-type circuit breaker is mainly composed of a contact system,an insulating base,an intelligent controller,a manual operating mechanism,an electric operating mechanism,and a mounting plate.

2.The drawout-type circuit breaker is mainly composed of a contact system,an insulating base,an intelligent controller,a manual operating mechanism,an electric operating mechanism,and a drawout base.

3.The circuit breaker adopts a three-dimensional layout,featuring a compact structure and small size.The contact system is enclosed in an insulating base plate,and the contacts of each phase are also insulated and separated to form individual small cavities;the intelligent controller,manual operating mechanism,and electric operating mechanism are arranged in sequence in front of it o form independent units.If one of the units is damaged,it can be completely removed and replaced with a new one.

4.The drawout-type circuit breaker consists of a plug-in circuit breaker and a drawout base.The guide rails inside the drawout base can be pulled in and out;the plug-in circuit breaker moves in and out of the drawout base along the guide rails,and the main circuit is connected through the insertion connection between the busbar on the plug-in circuit breaker and the bridge contact on the drawout base.

5.The drawout-type circuit breaker has three working positions:“Connected”position,"Test"position,and "Disconnected”position.The position change is achieved by screwing the handle in or out,and the indication of the three positions is displayed through the marks on the cross-beam of the drawout base.

6.When in the “Connected”position,both the main circuit and the secondary circuit are connected;when in the "Test”position,the main circuit is disconnected and insulated,only the secondary circuit is connected,and some necessary action tests can be carried out;when in the"Disconnected"position,both the main circuit and the secondary circuit are completely disconnected.In addition,the drawout type circuit breaker is equipped with a mechanical interlock function:the circuit breaker can only be closed in the “Connected”position or "Test”position,and cannot be closed in the intermediate position between "Connected”and “Test".

The interlock mechanism of the circuit breaker is applicable to both drawout-type and fixed-type breakers. Users can independently use the interlock mechanism to interlock two or three circuit breakers. Two circuit breakers can be optionally equipped with our company’s Y-700 intelligent controller, and three circuit breakers can be optionally equipped with the NQ6W intelligent controller to realize automatic switching of dual power supply.

Lever interlock