Gas Relay; Tranformer Oil Pressure Gauge

Gas Relay; Tranformer Oil Pressure Gauge image

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Basic Info.

Model NO.

Qj11-80 Type

Cooling Method

Oil-immersed Type Transformer

Winding Type

Multi-winding Transformer

Usage

Transformer

Frequency Characteristics

Power Frequency

Theory

Electromagnetic Relay

Electricity Type

Number of Pole

Load

Medium Power Relay

Protective Characteristics

Sealed Relay

Action Principle

Electronic Type

Size

Miniature

Type

Electric Parameter Relay

25/50/80

Function

Alarm

Flange Size

Need to Be Advised

Transport Package

Wooden Cases

Specification

To be checked

Trademark

VILLE

Origin

China

HS Code

8504901900

Production Capacity

50000

Packaging & Delivery

Package Size

31.00cm * 31.00cm * 32.00cm

Package Gross Weight

5.000kg

Product Description

Main application

Buchholz relay type QJ is a kind of protective device used for oil immersed transformer with conservator and on-

load tap changer. If a fault generated inside the transformer(or the on-load tap changer), cause gases

generated from oil decomposed. When the amount of gas accumulate up to a stated level, the signal contact of

buchholz relay turns on and send alarm signal. When a serious fault generates inside transformer or on-load

tap changer, the transformer oil surge will happen, oil flow heavily in the pipeline and result in the operation of

baffle plate of buchholz relay leads to the trip contact turning on, so trips the transformer. If the oil level is low

due to the oil losses, the alarms is also initiated.

Feature

assembling method

the relay’s pipe axis should be parallel to the transformer case cover,and it is allowed for the end leading to the conservator is highter,however the inclination between the axis and level surface may not exceed 4%

structure of the gas relay

the relay’s core structure is shown in fig.1 and the relay’s upper core consist of gas lock1,gas lock nut 2,probe 3,blocking 4,snap ring(float) 5,weight drop6,guard board 7,magnet 8, connecting terminal 9,spring 10,regulating rod11 and dry reed contact12.formin a flow device that acts on tripping,gas lock 1 in the cover is used for exhaustion in the case of assembly and extracting gas out of order. probe 3 is used to check flexibility and reliability of the tripping mechanism.

Application

The Gas relay series QJ is protective device for oil immered transformer. If a fault causes gas to be generated

in the transformer or a heavy surge of insulating oil the Gas relay shall be in operation, the alarm signal is

initeated and/or the transformer is tripped automatically.

Principle of design

When the transformer is operating normally, the Gas relay is completely filled with insulating oil .If a fault causes

gas to be generated in the transformer, the bubble will filter along towards the conservator and accumulated at

the highest point in the Gas relay. As the amount of gas coquette increases and the oil level in relay fall as a

result, the cup also falls and eventually reaches point where it actuates the magnetic switch with the permanent

magnet and so initiated the alarm signal. If the oil loses, the alarm signal is also initiated A violent generation of

gas accompanied by a heavy surge of insulating oil results in operation of baffle plate. the magnetic is actuated

by the permantmagnet on the baffle plate so it trips the transformer.

Technical data

(1) Working temperature: -30°C~95°C

(2) Switch Capacity: AC 220V 0.3A COSφ≤0.6

DC 220V 0.3A S≤5×10-3S

(3) Operation Character: Table

Type	QJ-80	QJ-50	QJ-25
Range of flow(m/s)	0.7~1.5	0.6~1.2	1.0
Gas accumulation (ml)	250~300		<250

(4) Sealing character: filling transformer oil into the relay, Pressurizing normal temperature 200kPa,Continued

20 min and without any leakage.

(5) Insulation Character Table

Test item	Voltage between contacts	Voltage between terminal and earth	Voltage between signal and trippingterminal
Bring to bear on industry voltaye	2000v /1 min	2000v /1 min	2000v /1 min

(6) Antivibration capacity when acceleration is 4g at vibration frequency of 4~20Hz,the relay shall not do any.

Installation and application

The overall size of QJ4-25 Relay is shown as Fig. A. The overall size of QJ1-50 ,80,QJ4-50,80 Relay is shown

as Fig. B. Seeing Table 3 for the size.

The Gas relay is fitted in pipeline between the tank and conservator. pay special attention to the arrow on the

housing the conservator.

For filling oil, please all valves in the pipeline between the tank and conservator, blled the housing via the

bleeder and then ciosed.

Air pumped form the air plug, the reliability of “Signal” contacting motion can bechecked.

Cover twisted down, pinprossed, the reliability of “Trip” contacting motion can bechecked.

Note

Before the newly-produced relay installed and used, the relay chip must be taken out and the locked banding

used during the transportation should be demolished.

The Gas relay must be checked by special device, then can mounted.

The spring on the baffle plate can changed the length, adjusting the value for tripping. The other parts of the

gas relay can`t change at will.

Replacing or adding some parts near the permanent magnet and magnetic switch, the non-magnetic material

must be used.

The permanent magnet can be not intensely vibratied or in strong magnetic field, The permissible operating

temperature is from -40°C to 100°C.

The magnetic switch can`t dismantle and the end of leads can`t bend at will.

Table

No.	Type	Connection pipe(mm)	Gas Volume (ml)	Set oil flow speed range (m/s)	Magnet contact tube	Connection diagram
1	QJ4-25	25	250	1.0	Single signal; Single trip	4
2	QJ4G-25				Single trip	5
3	QJ6-25				Double trips	6
4	QJ1-50	50	250~300	0.6~1.2	Single signal; Double trips	7
5	QJ1-80	80		0.7~1.5
6	QJ2-50	50		0.6~1.2
7	QJ2-80	80		0.7~1.5
8	QJ3-50	50		0.6~1.2	Single signal ;Double trips	8
9	QJ3-80	80		0.7~1.5	Single signal ;Double trips	8
10	QJ4-50	50		0.6~1.2	Single signal ;Double trips	7
11	QJ4-80	80		0.7~1.5	Single signal ;Double trips	7
12	QJ5-50	50		0.6~1.2	Single signal ;Double trips	8
13	QJ5-80	80		0.7~1.5
14	QJ6-50	50		0.6~1.2
15	QJ6-80	80		0.7~1.5
16	QJ7-50	50		0.6~1.2	Single signal ;Double trips	7
17	QJ7-80	80		0.7~1.5	Single signal ;Double trips	7
18	QJ8-50	50		0.6~1.2	Double signal; Double trips	9
19	QJ8-80	80		0.7~1.5
20	QJ9-50	50		0.6~1.2
21	QJ9-80	80		0.7~1.5
22	QJ10-50	50		0.6~1.2	Single signal ;Double trips	7
23	QJ10-80	80		0.7~1.5	Single signal ;Double trips	7
24	QJ11-50	50		0.6~1.2	Single signal ;Double trips	8
25	QJ11-80	80		0.7~1.5
26	QJ12-50	50		0.6~1.2
27	QJ12-80	80		0.7~1.5
28	QJ13-50	50		0.6~1.2
29	QJ13-80	80		0.7~1.5
30	QJ14-50	50		0.6~1.2	Double signal; Double trips	9
31	QJ14-80	80		0.7~1.5	Double signal; Double trips	9
32	QJ15-50	50		0.6~1.2	Single signal ;Double trips	8
33	QJ15-80	80		0.7~1.5	Single signal ;Double trips	8
34	QJ16-50	50		0.6~1.2	Double signal; Double trips	9
35	QJ16-80	80		0.7~1.5	Double signal; Double trips	9
36	QJ17-50	50		0.6~1.2	Double signals ;Single trip	10
37	QJ17-80	80		0.7~1.5
38	QJ18-50	50		0.6~1.2
39	QJ18-80	80		0.7~1.5
40	QJ19-50	50	250~300	0.6~1.2	Double signals ;Double trips	11
41	QJ19-80	80	250~300	0.7~1.5	Double signals ;Double trips	11

Our advantages:

Quality Assurance

–From the very beginning, VILLE ensures quality in every step to achieve the best quality.

Experience Sharing

–With more than 30 years’ experience in power industry, VILLE brings you an optimized solution.

Global Service

–Wherever you are, VILLE global network will support and provide you with value.

Quick Response

–In response to your needs without delay, VILLE knows the value of your time.

Thanks for choosing VILLE as your reliable partner and
please trust both of us will create a brilliant future!
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