21.9.16

KHOA DIEU KHIEN MAY CAT-DAO CACH LY-CHI THI CHAM DAT CA10-SGE108/109/110*FT


DISCREPANCY SWITCH - Size S0 using S0 Q100 lamp holder (for 9-24 contacts)







The Size S0 Discrepancy Switch using S0 Q100 consist of the following:
1.        The Mounting System.
2.        The Lighting System
3.        Push-in Interlock System
4.        Switch contacts.
5.        Illuminated handle


1.    Type S0 Q100


a.       Mounting System


i.      Mounting Type EL with round face plate
The front face plate is round and mounting is by means 2 mounting screws.




Fig. 57 – Type of mounting with round ring




ii.     A aluminum plastic square face plate can be mounted over the round face place. The square plate can be engraved with legends to show the functions of the various positions. It is available in round or square:

       Round  - 60 mm Ø
       Square - 60 x 60 mm







                                                                                                          9E2G C1/F-SG4364                           9E2G C1/F-SG4364


b.      Push To Turn Interlock System


The Push to Turn Interlock System is built-in the mounting unit of the switch. The interlocking program is 006 which operate as follows:


Program

Normal Level Handle Rotation

Normal Level Handle Push-in

Push-in Level Handle Rotation

F

From 9 to 12 o'clock

At 9 o'clock
At 12 o'clock

From 12 to 1 o'clock
From 9 to 8 o'clock


2.    The Lighting System

a.       Lamps Circuit





The size S0 lighting systems consist of a lamp holder with four socket outlets to accommodate 4 telephone bulbs type T6.8K (Fig. 48a). Depending on the control voltage, the lamps can be connected in series/parallel circuit. (Fig. 48b) the advantage of this arrangement is that should any of the lamps fails, other lamps in the parallel circuit will still lights up to indicate discrepancy reducing the danger of not knowing that there is a discrepancy fault due to lamp failures. In the example shown in Fig. 48b, for a supply voltage of 110V, by having lamps of individual rating of 60V, and by having the four lamps connected in a series/parallel network, it is possible to accommodate a supply voltage of 110V.


 Fig. 49a For supply voltage 220V DC – 4 lamps of 60V per filament lamp in series circuit


  


b.      Type of Lamps



Lamp Voltage

Max. Power Per Lamp

Reference

24V

2.0W

999 T6.8K/024
36V
2.0W
999 T6.8K/036
42V
2.0W
999 T6.8K/042
60V
2.0W
999 T6.8K/060





3.    Illuminated Handle


The translucent handle of 28mm diameter is screws on to the aluminum shaft. The handle will operate the auxiliary contacts when the handle is Push-in and the switch contacts when handle is turned. Removal of the handle from the shaft allows access to the lamps from the front of the panel.


4.    The Switch Contact System


The switch contacts operate when the handle is turn. The switches are suitable for both AC and DC switching. Types CAD11 with gold plate H-Bridge contact system is especially suitable for:
   Low voltage switching of electronics, and thermocouple circuits.
   Corrosive environment where the gold contact prevents oxidation of the contact resistance.


b.    AC Switching Capacity


Switch Type
CA10
CA20
CA25
CH10 CHR10
CH16 CHR16

Nominal Voltage (V)

690V

690V

690V

690V

690V
Nominal Current (A)
20A
25A
32A
20A
25A
Breaking Current (A)
30A
37A
48A
30A
37A

Fig 30 – AC Switching Capacity for Discrepancy Switch S0

c.       DC Switching Capacity


In selecting the switch model for DC switching, it is highly important to determine if the switch would be used for:
     Making the DC load only.
     Making and breaking the DC load.
     Breaking the DC load only.


i.        DC Utilization Category

The utilization category is determined by the time constant (L/R) of the load. Hence the more inductive the load is, the higher will be the time constant. Typical times constant for the various DC loads are:



Fig 31 - Type of Load and time constant





ii.      DC Making Capacity.

The DC Making capacity is independent from the value of the DC voltage and is much higher than the DC breaking capacity. However, it is dependent on the type of DC load (resistive/inductive load). In selecting a switch for DC making, it is important to consider the following factors:
   The switch to be used for making the DC circuits. The breaking of the circuit would be done by other devices in the circuit e.g. limit switch, contactors etc. Under no circumstances should the switch selected carry out the breaking of the DC circuit!!!
   The maximum DC voltage should not exceed the rated insulation voltage (Ui).
   To avoid overheating of the contacts, the maximum number of operations should not be exceeded.

Type of
L/R Time
Insulation
Rated Operational
Current
Load
Constant
Voltage (Ui)
CA10         CA20
CA25



CH10         CH16




CHR10       CHR16


Resistive

T < 1mS

690V

20A            25A

32A
Inductive
T = 50mS
690V
12A            20A
25A

Fig 32 - DC Making Capacity for Size S0 Discrepancy Switch


iii.    DC Making & Breaking Capacity

When breaking a circuit on DC Loads, it is important that the voltage across the contacts when the contact breaks should be below the arc extinguishing voltage Vex. Continuous arcing across an open contact can damage the contact. The DC breaking capacity at low DC voltage (below Vex) is generally the same as for AC voltage. However, as the DC voltage increases, the DC breaking capacity decreases. To increase the capacity, several contacts are connected in series to attain greater breaking capacity.
The DC breaking capacity of a switch contact is influenced by:
   The DC main supply voltage.
   The DC load current
   The resistively/inductivity of the load which depends on the time constant T = L/R
.


Rated Operational Current

Number of Series Contacts

1

2

3

4

CA10

CA20

CA25





CH10
CH16






CHR10
CHR16

Resistive Load L/R= /< 1 mS
24V
48V
70V
95V
20A
25A
32A

48V
95V
140V
190V
12A
20A
25A

60V
120V
180V
240V
4.5A
7.5A
10A

110V
220V
330V
440v
1A
1.5A
2A
Inductive Load L/R=  50 mS
24V
48V
70V
95V
12A
20A
25A

30V
60V
90V
120V
5A
9A
12A

48V
95V
140V
190V
2A
3A
3A

60V
120V
180V
240V
1A
1.5A
1.5A

110V
220V
330V
440v
0.4A
0.5A
0.5A
Fig. 33 - DC Breaking Capacity for Discrepancy Switch Size S0





d.      Low Voltage Switching  - Dry Circuit Rating of Switches


Control circuit device are designed for use with industrial control equipment where the voltage is relatively high (110V and above) and the current level are high (normally 0.25A and above) are generally known as Wet Circuit. At these levels, arcing occurs whenever the circuit is switch ON or OFF and the arcing burns away the contaminant, reducing the contact resistance i.e. self-cleaning.

Dry Circuit means no arc occurs during switching because the current and voltage is too low to generate an arc. As a result, any contaminant on the contact surface cannot be removed. For such applications, self-cleaning contacts and non-corroding contact is recommended for use. It is important that the Dry Circuit ratings should not be exceeded because the gold plating may be burnt off.
In selecting the switch model for low voltage switching, the Dry Circuit Rating should not be exceeded. The Dry Circuit Rating refers to the relationship between the supply voltage and load current. If the value exceeds, arcing may occur which would remove the layer of gold on the contact.

Minimum       Switch                  Dry Circuit Rating                                Contact                      Contact
Voltage
Type
Voltage
AC21A
DC21B
Type
Material

30mV

CAD11

1V
6V
12V
24V
48V

6A
3
2A
1A
0.8A

4A
2.5A
1.5
0.8A
0.3A

H-Bridge

Gold alloy
1V
CH11/CHR11
1V
6V
12V
24V
48V
6A
3
2A
1A
0.8A
4A
2.5A
1.5A
0.8A
0.3A
H-Bridge
Gold alloy
6V
CAD12
6V
12V
24V
48V
6A
6A
5A
4A
4A
3A
2.2A
1.2A
H-Bridge
Silver alloy
6V
CAD12
6V
12V
24V
6A
6A
5A
4A
3A
2.2A
H-Bridge
Silver alloy


48V
4A
1.2A



Fig. 34 - Dry Circuit Rating for Discrepancy Switch Size S0





Optional Extras


a.       Lost Motion Contacts

This type of switch is divided into two parts. The front portion contains the regular switch contacts, which is operated by turning the handle. The rear portion of the switch can accommodate the Lost Motion Contacts. Using the slip clutch M200 in which two camshafts can be coupled in such a way that the secondary camshaft will operate only after the primary camshaft has been moved over a pre-determined angle does this. The slip clutch is housed in a blank switch stage.


b.    Position Indicator

The position indictor provides a visual indication of the current switch position. The features are as follows:
     Brushed aluminum plate with black lettering. Other color combination available on request.
     Each indicator plate comes with double-sided adhesive backing to provide quick and easy installation onto the panel.
     Standard engravings as shown. Other customized engraving available on request.
 




  

TYPICAL REQUIREMENT



 When the handle of a discrepancy switch is turn 90o, the mimic diagram of the control panel placed in the Control room will immediately indicate any circuit interruptions. At the same time, the switch contact connect in series with the circuit breaker limit switch will operate the lamp inside the handle. The lamp will light up only when there is a discrepancy between switch position and the actual position of the circuit breaker, which is in a remote location. For example, if the handle is in the CLOSED position (A) and the circuit breaker is also CLOSE, the lamp in the discrepancy switch will not light up because there is no discrepancy. However, if the breaker TRIP because of a fault condition, the circuit breaker limit switch will close the lamp circuit and the lamp in the discrepancy switch handle will be energize because the circuit breaker is now open whereas the discrepancy switch in the Control Room still remains in the CLOSE position. The lamp in the Discrepancy Switch lights up and an audible alarm advise the operator in the Control room of the discrepancy between the actual circuit breaker condition and the switch condition. The operator will then turn the switch to TRIP (position E) to reset the discrepancy condition. Two lost motion contacts are required as well as two auxiliary (1NO+1NC) contacts which operates when the handle is Push-in.

Fig. 41 shows a typical application of a discrepancy switch and the contact arrangement required for this particular application. Contact rating is 10A and voltage supply is 110 VDC. Two auxiliary contacts (1NO + 1NC) for Signaling will operate when the handle is Push-in. Two Lost Motion contacts to be provided to light up the lamp when discrepancy arises.




ORDERING PROCEDURE for Discrepancy Switch Size S0


When ordering a Size S0 discrepancy switch, the following information is required:

     Switch Type - 10A / 110VDC

In the discrepancy switch circuit, under normal condition, no current flows to the breaker coil. When a discrepancy arises, the breaker motor drive will turn the breaker from CLOSE to TRIP resulting in a discrepancy. At the TRIP position no current flows. Hence, the discrepancy switch is only used for making the circuit to the coil but not for breaking the circuit. Hence the DC making chart in Fig 31 can be used for selecting the correct switch i.e. Type CA10.

     Mounting Type

Mounting required will be *E as according to Fig. 57.

     Coding for Control and Indicator Device/ Push-pull Interlock , the coding is S0 Q100/SGX1301 and S0 V130/SGX1302


     Switch Configuration
The switching configuration is as shown in Fig 41.
The switch should be given a special switch reference CA10 SGxxxx2

     Lamp Rating

The voltage of the power supply is 110VDC.
The reference code for a filament lamp is S0 Q100/SGX1498 (Fig. 48b)

     Lost Motion contact

A slip clutch is required to operate two lost motion contacts.

    

Position Indicator 9E2G C1/F-SG4364 (Fig. 39) Hence the ordering code is as follows:

MÃ HÀNG THÔNG DỤNG:
Khóa điều khiển máy căt: CA10-SGE108*FT
Dòng điều khiển: 20A
Điện áp: 690V
Bóng đèn: 110 VDC 
Bóngđèn :220-480VAC

Khóa điều khiển dao cách ly: CA10-SGE109*FT
Dòng điều khiển: 20A
Điện áp: 690V
Bóng đèn: 110 VDC 
Bóngđèn :220-480VAC

Khóa chỉ thị chạm đất: CA10-SGE110*FT
Dòng điều khiển: 20A
Điện áp: 690V
Bóng đèn: 110 VDC 
Bóngđèn :220-480VAC


Mọi chi tiết vui lòng liên hệ:
Ms. Hin
HP: 0985147560 - 0901 40 77 59
Skype: hien042015

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