Transformer Oil Level Gauge

YW13 Oil Level Gauge

Diagram Details:

Thread Specification: G1"

Key Dimensions:

Overall height: 181 ± 3 mm

Housing width: SW46

Base dimensions: Φ45, inner bore Φ22

Float stroke: Extended: 75 ± 2 mm, Retracted: 25 ± 2 mm

Welded Base Dimensions: Φ50 outer diameter, Φ40 inner diameter, height 50 mm, thread G1".

Model Information:

Code: TH.ZDA.010

Model: YW13

Base Code: 8TH.030.077

2. Straight Iron Seat Oil Standard Pipe

Structure: Straight glass tube with iron seat flanges at both ends.

Key Dimensions:

Tube diameter: Φ42

Tank opening: Φ16

Mounting holes: 4-M12, 2-Φ16

Parameter Table:

Working Principle of Transformer Oil Level Gauge

Transformer oil level gauge is an essential monitoring part for oil-immersed transformers, used to detect, display and alarm the insulating oil level inside the transformer conservator and tank.

Below is the working principle of the three mainstream types: float mechanical type, magnetic coupling type, pointer indication with alarm switch type.

1. Basic Working Principle (General Principle)

Transformer insulating oil will expand when temperature rises and contract when temperature drops, causing the oil level inside the conservator to rise or fall automatically.

The core principle of all oil level gauges:The float inside follows the up and down change of oil level → drive internal transmission mechanism → convert linear displacement into pointer rotation or switch signal → realize on-site visual display and high / low oil level alarm output.

2. Working Principle of Float Mechanical Oil Level Gauge

It consists of float, connecting rod, transmission mechanism, dial and pointer.

The float floats on the surface of transformer oil;

When oil level rises or falls, the float moves up and down synchronously;

The connecting rod drives the internal gear or lever mechanism;

The mechanical structure drives the pointer to rotate on the dial;

The pointer points to different scale positions to show normal oil level, high oil level and low oil level.

Feature: Pure mechanical structure, no power supply needed, simple and reliable.

3. Working Principle of Magnetic Coupling Oil Level Gauge (UHZ Series)

Adopt magnetic isolation coupling structure:

Inner part: float with magnetic steel installed inside the conservator;

Outer part: pointer and magnetic indicator outside the tank;

The tank body is fully sealed, inner and outer parts have no mechanical connection;

When oil level changes, the internal magnetic steel moves up and down with the float;

Through magnetic coupling force, drive the external pointer to rotate synchronously;

Realize fully sealed isolation display, no oil leakage, no moisture entering.

Feature: Sealed isolation, safe explosion-proof, suitable for outdoor and harsh environment.

4. Working Principle of YZF Series Oil Level Gauge (With Alarm Switch)

This type integrates local indication + remote alarm signal output:

Float and pendulum mechanism sense oil level change;

Through reversing gear and magnetic transmission, drive the dial pointer to display oil level;

When the oil level exceeds the set upper limit (over high) or lower limit (over low);

The mechanism triggers the built-in micro switch;

Output ON/OFF signal to the control cabinet, realize remote alarm or interlock trip protection.

Feature: Not only can see the oil level on site, but also support remote monitoring and automatic fault alarm.

5. Summary

All oil level gauges rely on float following oil level fluctuation as the core sensing method;

Convert oil level height change into mechanical pointer display;

Advanced models use magnetic coupling sealing and micro-switch alarm;

Real-time monitor transformer oil level, avoid equipment overheating and insulation damage caused by oil shortage.

Unit: All dimensions in mm.