relay RST-25, RZT-50, RST-80 (Full analogue relay transformer gas TWG-25, TWG-50, TWG-80 and relay Buchholz

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Item / Equipment / Relay / RELAY TRANSFORMER PROTECTION RST-25, RZT-50, RST-80 (Full analogue relay transformer gas TWG-25, TWG-50, TWG-80 and relay Buchholz /Germany/)

Deliver on the rights of the official dealer of factory


1. The PURPOSE

1.1. Relay transformer protection (relay) type RST-25, RZT-50 and RST-80 is protective relays for stand-alone or a liquid cooled machines with expansion vessel (transformers, multi-stage switches, capacitors, choke coils, and so on) and is mounted on the connecting pipe between the casing and the expansion vessel.
1.2. Relay type RST-25 (jet) is intended for switching signal "OFF" in case of an increase in velocity of the fluid in the connecting pipe above the specified threshold. The relay has a mechanical latch closed state of the contacts.
1.3. Relay types RZT-50 and RST-80 (dvuhpaltsevoe) is intended for switching of signals:
· WARNING - if a fault occurs in the operation of the protected device;
· "OFF" - when the loss of fluid or in excess of the velocity of the fluid in the connecting pipe above the specified threshold.
1.4. Nominal working fluid for the relay is transformer oil.

2. SPECIFICATIONS

2.1. The choice of type relays carried out according to table 1.
Table 1
Option
Relay type

RST-25
RZT-50
RST-80

1. Nominal bore, mm
25
50
80

2. The execution of the flange
round
round
square

3. The protected power transformer, MBA
?5
5
?10
10

4. The design of the relay
inkjet, bespolovogo
gas dvuhpaltsevoe

5. The number of contacts
one
two
two

6. Performance contacts
trailing

7. The volume of the gas bubble when the switching signal "WARNING"
no signal
300 +50/-100

8. The threshold value of the rate of oil flow, m/s (a tolerance of minus 25%)
0,9; 1,0; 1,5; 2,0; 2,5
0,65; 1,0; 1,5

9. Dimensions and weight
see Appendix 1


2.2. The General specifications are summarized in table 2.
Table 2
Option
The nominal value
Tolerances

1. The system contacts
The unit is sealed contacts in a metal case

2. Switching parameters


voltage, V
220
16-260
current, And
2
0,05-2,0

for DC, MS
15


for AC frequency 50-60 Hz


breaking capacity, W/VA
100

durability cycles, not less
10000


3. The maximum temperature of the insulating fluid, °C
+100
+120 V for 1 h

4. The viscosity of the insulating liquid, cm2/s

1-1100

5. The switching signal is "OFF" when the loss of fluid
When the level of fluid in the pipeline from 1 to 10 m

6. The response time (in excess of 1.25 times the set threshold), MS, not more than
100


7. The maximum excess pressure in the case of the relay, MPa
0,1
Pets evacuation to 0.005 MPa

8. The position of the relay - rise in the direction of the expansion vessel
2,5
1-4

9. Degree of protection
IP44


10. The type of climatic protection
NF1; T1 (depending on order)

11. Seismic stability
9 points on a scale -64

12. Vibration strength in the frequency range from 10 Hz to 200 Hz
1,5

13. Vibration strength in the frequency range from 4 Hz to 200 Hz (class B IEC standard)
1,0

14. Time closed state of the contacts (only for RST-50 and RST-80), MS, no less
50

15. Transient contact resistance, Ohm, not more than
0,3


2.3. The estimated content of precious and non-ferrous metals in the relay.Material
RST-25
RZT-50
RST-80

Silver Cf 999
0,146 g
0,292 g
0,292 g

Aluminium alloy ACC (AL9)-3-T5 GOST 1583-89
4190 g
4830 g
4050 g

Brass drugs 59-1 GOST 17711-80
9,44 g
10,84 g
10,84 g


3. COMPLETENESS

The kit is provided in table 3.
Table 3 № p/p
Name, designation
Quantity, items

1.
Protection relay transformer WHEY.647653.001
1

2.
Passport WHEY.647656.001 PS
1

3.
Packaging
1


4. THE DEVICE AND PRINCIPLE OF OPERATION

4.1. Device
The relay device is illustrated on the example of the relay RST-50, a schematic section of which is given in Fig. 1. The relay consists of a housing 1.1 and mechanical block 1.2.



The body is made of cast aluminum alloy and has an input and output flanges with holes for connecting the relay to the pipelines.
For visual inspection of the mechanical unit in the case, there are two sides of the sight glass. To protect the glass from dirt and harmful sun rays are fold up protective cover.
The red arrow on body indicates the direction of flow of fluid to the expansion vessel.
Mechanical block (Fig. 2) consists of a cover 2.1 and including mechanism 2.2.



The mechanical unit is mounted to the housing by bolts.
On the cover is cast from aluminum alloy mounted hasspouse valve 2.3, the control button 2.4 and in the terminal box, the unit is sealed to the magnetic