Description

Usage

BOD Self-Breakable& Combined Type Over Voltage Protect Device Mainly for power generation, electricity supply and electricity grid companies. Used to protect transformers, switches, bus, motor and other electrical equipment.

Features

1.BOD is a combination of electrical, by the overvoltage protection unit and fuse

units , overvoltage protection unit to restrict the atmosphere caused by over-voltageU

switching operation and a variety of over-voltage , white and relatively reliable

over-voltage limit can play a role , when the over-voltage protection unit thermal

breakdown occurs when，trip unit may be damaged overvoltage protection unit is detached from the system, avoid system phase short circuit accident.

2.Zinc oxide varistor and discharge gap structure , so that the two mutually protected. Discharge gap zinc oxide resistors charge ratio of zero , Nonlinear characteristics of zinc oxide resistance movement after the discharge gap and make no freewheeling , extinguishing discharge gap no longer bear the task of improving the life of the product .

3.Four- star connection , for white and relatively reliable over- voltage can play a limited role. Overvoltage between phases can be greatly reduced , greatly improved the reliability of protection .

4.Ambient temperature is -400C ~ +600 C, altitude less than 2000m.

Test Methods

1. Before the test should first LJ current relay setting value at minimum ( as a back-up protection ) , Then test transformer without load boost, current relay LJ should not

operate , The range of digital ammeter A2 raised the 10 ~ 20A (5KVA and below do not add capacity test transformer current limiting resistor R)

2. Frequency test voltage is applied to the test article A and D, B and D, C and D, A and C, B and C, and A and B. Test slowly increase the output voltage of the transformer , while observing the digital voltmeter and ammeter A2.SHK-BOD is not disruptive discharge gap , digital meter reading is zero or very small value A2 . When the test transformer output voltage reaches SHK-BOD of the action value , SHK-BOD discharge gap breakdown , reading digital ammeter A2 of the sudden increase , Ammeter A1 will also have the mutation phenomenon , then the high voltage test transformer output voltage value is the value of the work put in SHK-BOD .

3. Indoor type SHK-BOD test at the work place , the SHK-BOD conducted on iron , iron while grounded , iron surface should be slightly larger than the SHK-BOD underside.

4. Users do SHK-BOD workers put , you can not with current relay LJ whether the action as workers put the value of the basis for SHK-BOD .

5. In doing SHK-BOD frequency discharge , when the meter was observed to increase significantly when the regulator should immediately back to zero , and cut off the power. Should not continue to rise after the discharge voltage to avoid damage protection ; during the test , only the internal gap discharge , shall not have any part of the external flashover.

6. If during the test users found that workers put a value in excess of the allowable range table , carefully check the wiring is correct, the accuracy of the meter regulator carbon brushes and good contact . If after inspection test data is correct, indeed beyond theallowable range , please contact.

7. The user is doing other electrical equipment insulation test , the cable should SHK-BOD removal ; this product every year to do a preventive test.

Installation

Indoor type can be mounted horizontally in a variety of different types of switch cabinet , In addition to these products directly to the cabinet “A”, “B”, “C” -phase and phase to ground (“D” phase ) is connected to the outer conductor bare wire nose , The rest were closed insulator , so it ‘s white, relatively ( or cabinet ) and for a distance corresponding to a smaller cabinet installation space requirements , Can be directly installed in the chassis or

withdrawable switchgear transformer room ; This product can not flip transportation , such as flip must indicate at the time of ordering and with a flip stand to on-site installation .

Maintenance

1. Before using this product should work frequency discharge test

2. Every time a power outage , the protective device should be observed whether thevsilicone rubber coat color uneven , If there is uneven local color black , etc.

On the same pouches, Then the action may have a built- release , and you should work frequency discharge test confirmed，If the frequency discharge voltage exceeds 30% of the initial value , then the action of the trip really , but replace it.