Harrap faced the District Court on Friday after admitting two counts of deception in relation to the use of his government car and to one count of conspiring to commit an abuse of public office.

He had tried to avoid demerit points and the loss of his licence over speeding fines by lying about who was driving his car at the time.

He had also ensured he heard a court matter despite previously giving the lawyer involved private advice in relation to the case.

In sentencing, Judge Paul Slattery said he accepted Harrap had lost his career, that his mental health had been impacted and that he would be at greater risk in jail.

But he said Harrap knew the seriousness of his offending.

"Members of the judiciary are required to hold themselves separately from other members of society," Judge Slattery said.

"You are a judicial officer who has committed criminal offences. Those acts alone are apt to give rise to public disquiet about the integrity of the judicial system.

"Your criminal conduct has struck at the very heart and foundation of that judicial function along with the importance of the role.

"On three separate occasions, you deliberately ignored your role as a judicial officer and your solemn oath.

"In each case of your criminal conduct, you dealt with persons over whom you held and exercised varying degrees of power."

Two of Harrap's co-accused had no convictions recorded, including his former court clerk Melanie Freeman, who had agreed to take demerit points on his behalf.

However, a former police prosecutor Abigail Foulkes, who also had points taken from her licence, had a conviction recorded and was placed on a 12-month good behaviour bond.

The lawyer involved in the separate case, Catherine Moyse, had no conviction recorded and was fined $600 after admitting the same conspiracy charge as Harrap.

In earlier sentencing submissions, defence counsel David Edwardson QC said it was important to note that while Harrap had initially lied and brought others into his offending, he had not continued to lie when confronted by police.

"When one looks at Mr Harrap, it's readily apparent that his reputation, his character and his career have been utterly destroyed as a consequence of this extraordinary error of judgment," Mr Edwardson said.

Harrap was jailed for 18 months with a non-parole period of 12 months.

Judge Slattery said under the circumstances, it was not appropriate for him to suspend the terms or allow them to be served on home detention.

"Given your position as a judicial officer, your offending was so egregious and opportunistic, so lacking in judgment, and was so serious that good reasons do not exist to suspend your sentence," he said.

Australian Associated Press