LD-B10-A220 Temperature Controller of Dry LD-B10-A220

LD-B10-A220 Temperature Controller of Dry LD-B10-A220

LD-B10-A220 series temperature controller of dry transformer (Referred to as temperature controller) is an intelligent controller designed especially for safe operation of dry transformer. The temperature controller features adoption of single chip computer technology and utilization of the platinum thermo-resistors embedded in the winding of the dry transformer for detection and display of temperature rise of the transformer windings. It can start or stop the cooling fan automatically for forced air cooling of windings and control over-temperature alarm and over-temperature tripping output so that the transformer will be operated safely.

Introduction

Type selection (arbitrary combination of E, F, G/I and C)

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The Temperature controller

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The sensor assembly The instruction

The temperature controller
The sensor assembly
The instruction

Layout of controller：

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2 The technical specification

1. Operating conditions

Ambient temperature: -25℃～+55℃; Relative humidity: < 95％(25℃);

Power frequency: 50Hz or 60Hz(±2Hz);

Power voltage: AC220V(+10%, -15%);

AC380V(+10%, -15%);

(If there is no special indication when ordering, AC220V shall prevail)

2. Range of measurement

-30.0℃～240.0℃

3. Measurement accuracy

Grade of accuracy: Grade 1(Grade 0.5 for temperature controller, Grade B for sensor);

Resolution: 0.1℃

4. Power consumption of temperature controller

≤8W

5. Contact capacity

Capacity of contact of fan: 6A/250VAC (cosΦ=0.4);

Capacity of control output: 5A/250VAC (Resistance); 5A/30VDC

6. Standards of design and production

JB/T7631-2016 Electronic Thermo-controllers for Transformers ISO9001:2015 Quality Management Systems-requirements

3 Model function

Type selection (any combination between E, F, G/I, L and C)

LD-B10-A

Serial number of controller

220：Power

supply AC220V

380： Power

supply

AC380V

D ：Conventional type

E ：D+4~20mA current

output

F ：D+RS485

communication

G：D+1 channel ambient temperature measurement and control

I ：D+1 channel iron core temperature measurement and control

L：Fan fault

C：D+PTC over-temp alarm(optional) PTC over-temp trip(optional)

3. Sensing Cable Assembly

(1)D25 sensing cable (3-wire system), Cable length tolerances: ±2.5%

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(2)Sensor

A.Pt100 platinum resistor is a thermo-resistor with better linearity in the range of -30.0℃~240.0℃ and meets the requirements for Grade B set forth in GB/T8622-97-- Technical Specification and Reference Table for Industrial Platinum Resistance.

B.Overall dimension: Ф4mm×40mm

(3)Interlock control of Pt100 and PTC on over-temp alarm and over-temp trip signal (optional function)

A.Explanation of PTC

PTC is an abbreviation for positive temperature coeﬃcient thermistor, which is a semiconductor resistor having a typical temperature sensitivity. When the temperature exceeds a certain value (Fixed temperature point not be adjust- able), its resistance value will increase impulsively with increasing temperature, i.e., resistance mutation.

B.Logical relation of interlock control of Pt100 and PTC

a.Interlock control of Pt100 and PTC on over-temp alarm

When the temperature measured by Pt100 exceeds over-temp alarm value, in addition, PTC reaches the point of over-temp alarm and the resis- tance has mutated. Over-temp alarm signal will output.

b.Interlock control of Pt100 and PTC on over-temp trip

When the temperature measured by Pt100 exceeds over-temp trip value, in addition, PTC reaches the point of over-temp trip and the resistance has mutated. Over-temp trip signal will output.