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TR-80-R Buchholz Relay

Intelligent gas relay is a basic device applied to oil immersed transformer. It can monitor the accumulation of gas generated by leakage current, arc, flashover and other faults in the transformer in real time, and send out alarm signals when the gas reaches a certain amount; In case of serious internal fault of transformer (such as interturn short circuit, etc.), use the oil flow surge phenomenon generated at this time to trigger contact connection, and quickly lock the main circuit of transformer to protect the transformer.
tr 80 r intelligent gas relay
  • tr 80 r intelligent gas relay
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Product features:

  • Up to three alarms, three locks, triple redundancy design, improve product reliability

  • It can monitor the volume of gas gas online in real time and transmit it to the background through RS485 digital signal (compatible with 4-20mA analog signal); The external independent gas volume monitoring chamber isolates the interference on the volume monitoring caused by the operation of other components

  • The all-metal high-strength movement framework is used to stabilize the flow rate setting value of up to 2.5 m/s

  • The float main shaft is equipped with imported precision bearings to increase bearing support and eliminate the hidden danger of wear due to float shaft bore.

  • The streamlined float ensures stance stability at high oil speeds

  • Protection grade reaches IP67, strong salt spray resistance environment (360 hours NSS salt spray test)


Technical parameters:

1. Material of main components

Shell: aluminum alloy

Observation glass: UV resistant protective glass


2. Working environment

Oil temperature: - 40 ℃~+100 ℃

Ambient temperature: - 40 ℃~+70 ℃


3. Action point properties:

Setting range of oil speed alarm: 0.7~2.5m/s, accuracy ± 12%

Three pairs of dry spring contacts for light and heavy gas alarm (three alarms and three locks)

Electronic auxiliary action point: 1 pair


4. Installation environment: protective cover is required for outdoor use

Suitable for high altitude environment


5. Cable connector: M25X1.5 (for action point), one on both sides of the junction box;4X0.5 Shielded cable (for remote signal)

6. Electrical characteristics:

Maximum rated power of action point: 50W (5A), maximum switching current: 3A;

Auxiliary action point: maximum switching power 150W (5A)

Mainboard power supply: 18~36 VDC;

Power frequency withstand voltage: between reed tube contact groups, to ground: 2.5KV DC/AC 1min

Reed contact normally open, auxiliary contact normally open: 1.0KV DC/AC 1min

Analog output: 4~20mA

Digital signal output: communication protocol ModBus RTU RS-485


7. Number of contacts: up to seven pairs, six pairs of dry spring contacts, and one pair of auxiliary changeover contacts


8. Suitable for high altitude environment


9. Protection grade IP67;


10. Electromagnetic compatibility characteristics:

IEC 61000-4-2 Class IV

IEC 61000-4-3 Class III

IEC 61000-4-4 Class IV

IEC 61000-4-5 Class IV

IEC 61000-4-6 Class III

IEC 61000-4-8 Class V

IEC 61000-4-9 Class V

IEC 61000-4-10 Class IV

IEC 61000-4-12 Class III

IEC 61000-4-17 Class III

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Lanso Instruments INC.
233 W 1st St #210, North Vancouver, Canada
233 W 1st St #210, North Vancouver, Canada