There is numerous Buchholz relay testing procedure and a few famous tests are explained below in detail. If high eddy currents, local overheating, or partial discharges occur within the tank, bubbles of resultant gas rise to the top of the tank. Leakage Test: The relay can be packed with oil even at 90 degrees Celsius temperature and through the force of its bars it is verified for the outflow for over 30 minutes of time. But opting out of some of these cookies may affect your browsing experience. It is used for the protection of a Transformer from the faults occurring inside the transformer. These are pipe attached inside the Buchholz relay and manual air pump for testing contact movement by blowing compressed air from the outside as it is installed. The Buchholz relay has the function of collecting and keeping the gas in its interior, and then sending an alarm and/or a trip signal to the transformer. The function of the relay depends on the mechanical phenomenon. Buchholz relays in South Africa By P De Matos, Allbro Where there is a power transformer, you will find a Buchholz relay. During large faults, the lower reed switch activates the trip circuit of the circuit breaker and interrupts the power supply to the transformer, thereby avoiding large accidents. But Buchholz relay gives an indication of the fault at very early stage, by anticipating the fault and operating the alarm circuit. Introduction to Buchholz Relay. Sometimes due to oil outflow on the major tank, air bubbles may build up in the upper part of the Buchholz container which may also source a drop of oil level in it and alarm circuit will strengthen. This part can be understood only after reading the following sections. • Remove test meter from Buchholz terminals and re˛t terminal box cover. ... Surge Test(TRIP)(cm/s) Gas Volume(ALARM)(cc) High Voltage Test Insulation Resistance Test Current Rating of Switch Vibration Sensitivity below1 250 128 205 1”BSC Conduit 72 M10 78 square 25 The present invention relates to test equipment (100) for testing a Buchholz relay (10) for protecting a transformer from mechanical failure, and the present invention relates to an oil circulation unit (110) for circulating oil inside the Buchholz relay (10). It is a gas actuated relay installed in oil immersed transformers, for protection against many types of internal faults in transformers which have rating of 750 kVA or above (It is considered to be uneconomical to use Buchholz relay for the transformers rated less than 750kVA). They have a nitrogen injection port on the tank side of the Buchholz to inject to test each of these contacts, and a bleed port from the top of the Buchholz which allows for the nitrogen or fault-gasses to be captured for laboratory analysis. The external housing of the Buchholz Relay is made from aluminium alloy. Buchholz relay A drain cock or test cock is provided at the bottom of the relay, and a release cock is provided at the top of the relay, release cock is used to release the pressure of the gases in the chamber, also it is used to check the type and quality of gases released during faults. It is a device gathering the resolution gas generated in transformer through a pipe from gas release valve of Buchholz relay. breather cock and a test button for the mechanical release of the floats to test the alarm circuits. This enables the continuous monitoring of the relay from a remote location. • After satisfactory testing close TEST ballvalve, remove ˜exible hose and replace dust caps. You also have the option to opt-out of these cookies. These bubbles rise through the pipe between the tank and the conservator. Put the bucholz relay in the Test Mode and short the alarm contacts and check if the annunciation is received in the control room, then short the tripping contact and check whether Trip command is issued to the breaker. An electrical circuit contact test button and the terminals are enclosed in a weather-resistant cast aluminium alloy terminal box fitted at the top of the relay. Doing an analysis of gases we can get an idea about the type of incipient fault. Thus the transformer can be taken out of service before any type of serious damage occurs. The float is attached to a hinge in such a way that it can move up and down depending upon the oil level in the Buchholz relay Container. The Buchholz relay is provided with two hinged floats/buckets which on tilting operate mercury switches inside the oil tight enclosure. The MESSKO Gas Quick Test offers fast, easy and safe identification of fault gases in the field. 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